CN118327770A - A hydraulically controlled passive pre-chamber ignition system with variable volume and nozzle holes - Google Patents
A hydraulically controlled passive pre-chamber ignition system with variable volume and nozzle holes Download PDFInfo
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- CN118327770A CN118327770A CN202410494970.5A CN202410494970A CN118327770A CN 118327770 A CN118327770 A CN 118327770A CN 202410494970 A CN202410494970 A CN 202410494970A CN 118327770 A CN118327770 A CN 118327770A
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- plunger
- chamber
- hydraulic control
- shell
- precombustor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
- F02B19/1004—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder details of combustion chamber, e.g. mounting arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention provides a hydraulic control passive precombustor ignition system with variable volume and spray holes, which comprises: the invention relates to a passive variable precombustor volume and spray hole mechanism, which realizes the continuous variable precombustor volume, the penetration distance of jet flow, the variable diameters of scavenging holes and spray holes. According to the working conditions, the jet flow mode of the small jet holes and the jet flow mode of the large jet holes are realized, the jet flow reaches the effective distribution of various positions of the mixed gas, the ignition capability is improved, the lean combustion capability of the engine under multiple working conditions is widened, the thermal efficiency of the engine is improved, and the situation that the mixed gas in the cylinder cannot be actively acquired by the traditional passive precombustor and the residual gas in the precombustor after combustion cannot be discharged is effectively improved.
Description
Technical Field
The present invention relates to a pre-chamber ignition system, and more particularly, to a hydraulically controlled passive pre-chamber ignition system with variable volume and orifice.
Background
In the field of automobile industry, the lean combustion technology has higher thermal efficiency, reduces pumping loss and heat transfer loss, and is one of important means for improving the thermal efficiency of an internal combustion engine. When the engine uses the lean combustion technology, the lean mixture is difficult to burn, the combustion speed is reduced, and the unstable combustion affects the normal operation and performance of the engine. The jet ignition technology of the precombustion chamber is an effective way for solving the current lean combustion problem, and compared with the traditional spark plug ignition, the jet ignition technology has the characteristics of higher ignition energy, fast flame propagation and easiness in large-area ignition of mixed gas, widens the operating range of the lean combustion of the engine, improves the thermal efficiency of the engine and reduces the emission of harmful pollutants.
The jet ignition system of the precombustor is divided into an active type and a passive type, and the passive precombustor cannot independently control the concentration of the mixed gas in the precombustor, but is simple to integrate and install, is easy to reform on the existing engine, and generates a plurality of ignition points and denser turbulent combustion in the combustion chamber relative to the engine in an ignition mode. The passive precombustion chamber is limited by the structure of the passive precombustion chamber, so that stronger jet flow effect cannot be formed after the mixed gas in the precombustion chamber is ignited, and the residual waste gas in the precombustion chamber is large and is not easy to discharge. In view of this, the present invention is to provide a precombustor ignition system with a variable precombustor volume and nozzle holes based on hydraulic control, which can realize the change of the precombustor volume on the one hand, and can make more mixture enter the precombustor to promote the thermal jet and ignition performance when the cylinder enters the mixture, and effectively reduce the residual exhaust gas in the precombustor; on the other hand, the difference of the diameter of the spray holes is utilized to improve the exchange and uniformity of the mixed gas and optimize the combustion process.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a hydraulic control passive pre-combustion chamber ignition system with variable volume and nozzle, comprising:
The device comprises a main shell, wherein a first hydraulic control chamber, a second hydraulic control chamber, a precombustor plunger mounting chamber, a precombustor outer chamber, a spark plug mounting hole, an oil inlet channel, an oil return channel, a first oil inlet channel, a second oil inlet channel, a first oil return channel and a second oil return channel are arranged in the main shell; the first hydraulic control chamber and the second hydraulic control chamber are arranged at the upper part in the main shell, and the pre-combustion chamber plunger mounting chamber is arranged at the middle part in the main shell; the precombustion chamber is arranged at the lower part in the main shell; the spark plug mounting hole is vertically arranged in the main shell; the oil inlet channel and the oil return channel are respectively arranged at two sides of the upper part of the main shell; the oil inlet channel is connected with the first oil inlet channel and the second oil inlet channel, and the first oil return channel and the second oil return channel are connected with the oil return channel; one or a plurality of through outer spray holes are arranged at the bottom of the precombustion chamber, and one or a plurality of outer scavenging holes are arranged on the side wall of the precombustion chamber;
the spark plug is arranged in the spark plug mounting hole, and the lower end of the spark plug stretches into the inner cavity of the precombustion chamber;
the oil pressure regulating valve is arranged at the upper part of the main shell and is connected with the oil inlet channel;
the first plunger is arranged in the first hydraulic control cavity, one end of the first plunger penetrates through a through hole formed in the side wall of the first hydraulic control cavity, and the first oil inlet flow passage is selectively partially or completely closed;
The second plunger is arranged in the second hydraulic control chamber, one end of the second plunger penetrates through a through hole formed in the side wall of the second hydraulic control chamber, and the second oil return flow passage is selectively partially or completely closed;
The precombustor plunger limiting block is in a stepped hollow column shape and is arranged in the precombustor plunger mounting cavity; the diameter of the lower part of the precombustion chamber plunger limiting block is smaller than the diameter of the precombustion chamber outer cavity;
The pre-combustion chamber plunger is hollow and columnar, and a shoulder is arranged at the outer edge of the upper end of the plunger; the pre-combustion chamber plunger is sleeved at the lower part of the spark plug mounting hole, the inner wall of the pre-combustion chamber plunger limiting block, the upper surface of the pre-combustion chamber plunger shoulder and the outer wall of the spark plug mounting hole enclose a first hydraulic cavity, and the first hydraulic cavity is communicated with the first oil inlet flow passage and the first oil return flow passage and is used for pushing the pre-combustion chamber plunger to axially move; the outer part of the precombustor plunger is sleeved with a precombustor plunger reset spring, and the upper end and the lower end of the precombustor plunger reset spring are respectively abutted between the precombustor plunger shoulder and the precombustor plunger limiting block inner wall shoulder;
The precombustion chamber comprises a precombustion chamber housing, a precombustion chamber housing and a support, wherein the precombustion chamber housing is arranged in a precombustion chamber outer chamber, and a shoulder is arranged at the outer edge of the upper end of the precombustion chamber housing; the upper end of the precombustion chamber housing is positioned between the inner wall of the precombustion chamber outer chamber and the outer wall of the precombustion chamber plunger limiting block, the upper surface of the shoulder of the precombustion chamber housing, the inner wall of the precombustion chamber outer chamber and the outer wall of the precombustion chamber plunger limiting block enclose a second hydraulic chamber, and the second hydraulic chamber is communicated with a second oil inlet flow passage and a second oil return flow passage and is used for pushing the precombustion chamber housing to axially move; the outer part of the precombustion chamber inner chamber shell is sleeved with a precombustion chamber reset spring, and the upper end and the lower end of the precombustion chamber inner chamber reset spring are respectively abutted between the precombustion chamber inner chamber shell shoulder and the precombustion chamber inner wall boss; one or a plurality of through inner spray holes are arranged at the bottom of the inner cavity shell of the precombustion chamber, and one or a plurality of inner scavenging holes are arranged on the side wall of the inner spray holes;
the hydraulic oil tank is connected with the oil pressure regulating valve through an oil inlet pipeline and is connected with the oil return channel through an oil return pipeline.
Further, a first cam shaft and a first cam are arranged in the first hydraulic control cavity, the lower end of the first cam shaft is pivoted on the lower end cover of the first hydraulic control cavity through a lower bearing, and the upper part of the first cam shaft penetrates through the through hole at the upper end of the first hydraulic control cavity and the through hole at the upper end of the main shell, is connected with an external driving device and is pivoted on the main shell through an upper bearing; the first cam shaft is in sealing fit with the through hole at the upper end of the first hydraulic control chamber and the through hole at the upper end of the main shell; the first cam is arranged on the first cam shaft and is in abutting connection with the end face of the first plunger; one end of the first plunger, which is positioned in the first hydraulic control cavity, is provided with a shoulder, a first plunger return spring is sleeved outside the first plunger, and two ends of the first plunger return spring are respectively abutted against the first plunger shoulder and the inner wall of the first hydraulic control cavity.
Further, a first plunger limiting block is further arranged in the first hydraulic control cavity, and the first plunger is arranged in a limiting channel of the first plunger limiting block.
Further, a second cam shaft and a second cam are arranged in the second hydraulic control chamber, the lower end of the second cam shaft is pivoted on the lower end cover of the second hydraulic control chamber through a lower bearing, and the upper part of the second cam shaft penetrates through the through hole at the upper end of the second hydraulic control chamber and the through hole at the upper end of the main shell, is connected with an external driving device and is pivoted on the main shell through an upper bearing; the second cam shaft is in sealing fit with the through hole at the upper end of the second hydraulic control chamber and the through hole at the upper end of the main shell; the second cam is arranged on the second cam shaft and is abutted against the end face of the second plunger; one end of the second plunger, which is positioned in the second hydraulic control chamber, is provided with a convex shoulder, a second plunger return spring is sleeved outside the second plunger, and two ends of the second plunger return spring are respectively abutted against the convex shoulder of the second plunger and the inner wall of the second hydraulic control chamber.
Further, a second plunger limiting block is further arranged in the second hydraulic control cavity, and the second plunger is arranged in a limiting channel of the second plunger limiting block.
Further, the first cam comprises a base circle segment and a lift type segment;
The second cam comprises a first type line segment, a second type line segment and a third type line segment; the connection point of the third line segment and the first line segment is a first lift point, the connection point of the first line segment and the second line segment is a second lift point, and the connection point of the second line segment and the third line segment is a third lift point.
Further, the main shell comprises an upper shell, a lower shell and an upper end cover, wherein the upper shell is fixedly connected with the lower shell, and the spark plug mounting hole is vertically arranged in the middle of the upper shell and extends into the lower shell; the first hydraulic control chamber and the second hydraulic control chamber are arranged in the upper shell; the precombustor plunger mounting chamber and precombustor chamber are arranged up and down in the lower housing; the first oil inlet flow passage and the first oil return flow passage are arranged in the upper shell, one part of the second oil inlet flow passage and one part of the second oil return flow passage are arranged in the upper shell, and the other part of the second oil inlet flow passage and the second oil return flow passage are arranged in the lower shell; the upper end cover is arranged at the top end of the upper shell, and is provided with a first cam shaft through hole, a second cam shaft through hole, a spark plug through hole, an oil inlet channel and an oil return channel which are communicated up and down; the oil pressure regulating valve is arranged on the upper end cover; the upper end cover is also provided with an upper bearing of the first cam shaft and the second cam shaft and a bearing fixing block.
Further, the diameter of the inner spray hole at the bottom of the inner cavity shell of the precombustion chamber is smaller than that of the outer spray hole at the bottom of the main shell.
The working principle of the invention is as follows:
according to the hydraulic control passive type pre-combustion chamber ignition system with variable volume and spray holes, an oil inlet channel in a main shell is respectively connected with a first oil inlet channel and a second oil inlet channel, and the first oil return channel and the second oil return channel are respectively connected with an oil return channel;
The oil inlet channel, the first hydraulic cavity, the first oil return channel and the oil return channel are formed by surrounding the inner wall of the pre-combustion chamber plunger limiting block, the upper surface of the pre-combustion chamber plunger shoulder and the outer wall of the spark plug mounting hole; one end of the first plunger penetrates through a through hole formed in the side wall of the first hydraulic control chamber, selectively closes the first oil inlet flow passage, controls hydraulic pressure in the first hydraulic chamber, and further controls axial movement of the plunger in the precombustion chamber: the first plunger is retracted, the first oil inlet flow passage is communicated, the hydraulic pressure in the first hydraulic cavity is increased, and the plunger of the precombustion chamber moves downwards to reduce the volume of the precombustion chamber; otherwise, the first plunger extends out to seal the first oil inlet flow passage, the hydraulic pressure in the first hydraulic cavity is reduced, the plunger in the precombustor moves upwards in a resetting mode under the action of the plunger return spring in the precombustor, and the volume of the precombustor is increased.
The upper surfaces of the oil inlet channel, the second oil inlet channel and the shoulder of the shell of the precombustion chamber, the second hydraulic chamber, the second oil return channel and the oil return channel are formed by surrounding the inner wall of the precombustion chamber and the outer wall of the precombustion chamber plunger limiting block to form another hydraulic oil channel; one end of the second plunger penetrates through a through hole formed in the side wall of the second hydraulic control chamber to selectively close the second oil return flow passage, control hydraulic pressure in the second hydraulic chamber and further control axial movement of the precombustion chamber shell: the second plunger is retracted, the second oil return flow passage is communicated, the hydraulic pressure of the second hydraulic cavity is reduced, and the inner scavenging hole of the side wall of the inner cavity shell of the precombustion chamber is connected with the outer scavenging hole of the main shell under the action of the return spring of the inner cavity of the precombustion chamber; the second plunger extends out a certain distance, the second oil return flow passage is not completely closed, hydraulic pressure in the second hydraulic cavity is increased to a certain extent, the precombustion chamber inner cavity shell overcomes the force of the precombustion chamber inner cavity return spring and moves downwards a certain distance, so that the inner scavenging holes on the side wall of the precombustion chamber inner cavity shell are disconnected with the outer scavenging holes of the main shell, the inner spray holes at the bottom of the precombustion chamber inner cavity shell are not connected with the outer spray holes of the main shell, and the spray is in a large-aperture spray state; the second plunger is completely extended out, the second oil return flow passage is closed, the hydraulic pressure in the second hydraulic pressure cavity is maximum, the precombustion chamber inner cavity shell overcomes the force of the precombustion chamber inner cavity return spring and moves downwards to be in butt joint with the bottom of the main shell, the inner scavenging holes on the side wall of the precombustion chamber inner cavity shell are disconnected with the outer scavenging holes of the main shell, the inner spray holes on the bottom of the precombustion chamber inner cavity shell are connected with the outer spray holes of the main shell, and at the moment, the jet flow is in a small-aperture jet flow state.
The spark plug is used for igniting the mixed gas in the precombustion chamber.
The oil pressure regulating valve is used for controlling the amount of hydraulic oil entering the oil inlet channel.
The pre-combustion chamber plunger limiting block is used for limiting the plunger of the pre-combustion chamber, and the inner wall of the plunger limiting block of the pre-combustion chamber is in sealing fit with the shoulder of the plunger of the pre-combustion chamber.
The precombustor plunger is used for changing the precombustor volume; the precombustor plunger is in sealing fit with the outer wall of the spark plug mounting hole.
The shoulder of the precombustion chamber shell is matched with the inner wall of the precombustion chamber and the outer wall of the precombustion chamber plunger limiting block in a sealing way.
The hydraulic oil tank is used for storing hydraulic oil.
In the first hydraulic control cavity, the first cam shaft rotates to drive the first cam to rotate so as to push the first plunger to move in different degrees; the first plunger return spring provides a return force to the first plunger.
The first plunger limiting block plays a limiting role on the first plunger.
In the second hydraulic control cavity, the second cam shaft rotates to drive the second cam to rotate so as to push the second plunger to move in different degrees; the second plunger return spring provides a return force to the second plunger.
The second plunger limiting block plays a limiting role on the second plunger.
The first cam comprises a base circle segment and a lift type segment; when the first cam works on the base circle section, the first plunger does not seal the first oil inlet flow passage; the first plunger gradually extrudes the first oil inlet runner to be completely closed in the process that the first cam works on the lift type line segment and reaches the highest point of the lift type line segment.
The second cam comprises a first type line segment, a second type line segment and a third type line segment; the connection point of the third line segment and the first line segment is a first lift point, the connection point of the first line segment and the second line segment is a second lift point, and the connection point of the second line segment and the third line segment is a third lift point; the first lift point height is less than the second lift point height, and the second lift point height is less than the third lift point height. When the second cam works at the first lift point, the second plunger extrudes the second oil return flow passage to a certain extent, smaller hydraulic pressure is generated in the second hydraulic cavity, the pre-combustion chamber inner cavity shell moves downwards until the inner scavenging hole on the side wall of the pre-combustion chamber inner cavity shell is connected with the outer scavenging hole of the main shell; when the second cam works at a second lift point, the second plunger further extrudes a second oil return flow passage, the hydraulic pressure in the second hydraulic cavity is increased, the inner scavenging hole of the inner cavity shell of the precombustion chamber is disconnected with the outer scavenging hole of the main shell, the inner spray hole at the bottom of the inner cavity shell of the precombustion chamber is not connected with the outer spray hole of the main shell, and the spray is in a large-aperture spray state; when the second cam works at the third lift point, the second plunger completely closes the second oil return flow passage, the hydraulic pressure in the second hydraulic cavity is maximum, the inner scavenging hole of the inner cavity shell of the precombustion chamber is disconnected with the outer scavenging hole of the main shell, the inner spray hole at the bottom of the inner cavity shell of the precombustion chamber is connected with the outer spray hole of the main shell, and the spray is in a small-aperture spray state.
The working process of the invention comprises the following steps:
(1) Auxiliary air intake condition
The first cam works on the base circle segment and turns to the lift type segment, the first plunger is extruded to completely seal the first oil inlet flow channel, hydraulic pressure in the first hydraulic cavity is reduced, the plunger in the precombustor moves upwards under the upward acting force of the plunger return spring in the precombustor, the precombustor volume is increased, and more mixed gas is guided to enter the precombustor. Meanwhile, the second cam works to a first lift point between the third line segment and the first line segment, the second plunger opens the second oil return flow channel to enable the inner scavenging hole of the side wall of the inner precombustion chamber shell to be connected with the outer scavenging hole of the main shell, the air inlet of the precombustion chamber is increased, more mixed gas enters the precombustion chamber, and the ignition jet flow is convenient to improve the lean-burn capability.
(2) Engine jet ignition mixed gas and large aperture jet working condition
The first cam works on the lift type line segment to rotate towards the base circle segment, the first plunger releases the closure of the first oil inlet flow channel, the hydraulic pressure in the first hydraulic cavity is gradually increased, the plunger in the precombustor overcomes the downward movement of the plunger return spring in the precombustor, meanwhile, the spark plug ignites the mixed gas in the precombustor, the mixed gas in the engine cylinder is sprayed out through the spray hole to ignite, when the first cam is not completely rotated into the base circle segment, the capacity reduction amount of the precombustor is different along with the difference of the downward movement degree of the plunger in the precombustor so as to obtain the jet capacity of different thrust, and the rotation degree of the first cam shaft can be adjusted along with the change of working conditions;
The second cam and the first cam work simultaneously, the second cam is turned to a second lift point from the first lift point, when the second cam works to the second lift point, the second plunger part extrudes the second oil return flow channel, the hydraulic pressure in the second hydraulic cavity is increased, the shell of the inner cavity of the pre-combustion chamber moves downwards for a certain distance, the inner scavenging hole of the shell of the inner cavity of the pre-combustion chamber is disconnected with the outer scavenging hole of the main shell, the inner spray hole at the bottom of the shell of the inner cavity of the pre-combustion chamber is not connected with the outer spray hole of the main shell, at the moment, the spray is not influenced by the inner spray hole and the outer spray hole after being sprayed out, and the spray enters the engine cylinder to do work in a large-aperture spray state.
(3) Engine jet ignition mixed gas and small aperture jet working condition
The first cam keeps the rotating state of the previous step, the plunger of the precombustor continues to move downwards, and the volume of the precombustor is compressed;
When the second cam works to the third lift point, the second plunger seals the second oil return flow passage, the hydraulic pressure in the second hydraulic cavity is maximum, the inner cavity shell of the precombustor moves downwards to be abutted with the main shell, the inner scavenging hole of the inner cavity shell of the precombustor is disconnected with the outer scavenging hole of the main shell, the inner spray hole at the bottom of the inner cavity shell of the precombustor is connected with the outer spray hole of the main shell, and the jet enters the engine cylinder to do work in a small-aperture jet state.
(4) Auxiliary exhaust condition
The first cam works on the base circle section, the plunger of the precombustion chamber moves downwards to the lowest point at the moment, meanwhile, the second cam rotates from the third line section to the first line section, so that the second plunger is gradually far away from the second oil return flow passage, hydraulic oil flows out of the second hydraulic cavity, the pressure of the second hydraulic cavity is reduced, the shell of the inner cavity of the precombustion chamber moves upwards under the action of the return spring of the inner cavity of the precombustion chamber, at the moment, the inner scavenging hole is communicated with the outer scavenging hole, the exhaust gas circulation capacity in the precombustion chamber is improved, and the plunger of the precombustion chamber pushes the exhaust gas in the precombustion chamber downwards to be discharged out of the precombustion chamber, so that the exhaust gas is swept as far as possible; ready for the next cycle.
The invention has the beneficial effects that:
The invention relates to a passive variable precombustor volume and spray hole mechanism, which realizes the continuous variable precombustor volume, the penetrating distance of jet flow and the variable diameter of scavenging holes and spray holes. When the engine ignition is needed to change the volume of the precombustion chamber so as to adjust ignition energy and the ignition position reached by jet flow, when a hydraulic oil duct is opened, the ECU obtains the position of a first cam and a second cam which are optimal in the current working condition according to a prefabricated valve lift MAP graph, and the position of a plunger of the precombustion chamber is controlled by rotating the first cam shaft to obtain hydraulic oil pressure to move so as to drive air flow into a precombustion chamber system, or jet flow is sprayed into an engine cylinder, or exhaust gas is discharged into the cylinder to optimize working circulation, and simultaneously, the second cam shaft controls different positions of a chamber shell in the precombustion chamber to realize opening of a small jet hole mode, a large jet hole mode and scavenging and air intake in the precombustion chamber so as to optimize the air intake process and exhaust process of the engine, realize the small jet hole jet mode and the large jet hole mode according to the working condition, realize effective distribution of jet flow reaching various positions of mixed gas, improve ignition capability, widen lean combustion capability of the engine under the multiple working conditions, and improve thermal efficiency of the engine.
The invention realizes the function of variable stepless regulation of the precombustion chamber volume system, and effectively improves the situation that the traditional passive precombustion chamber can not actively acquire the mixed gas in the cylinder and the residual waste gas in the precombustion chamber after combustion can not be discharged. The engine ignition device has the advantages that a good engine ignition effect is achieved on the basis that the traditional passive precombustor is easy to install and is not greatly improved, system complexity and application cost are reduced, the dynamic property and economy of the engine are improved, and the emission of harmful pollutants is reduced.
Drawings
FIG. 1 is a schematic view of a main housing structure of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the auxiliary air intake condition of the present invention;
FIG. 3 is a schematic diagram of the overall structure of the present invention under the large aperture jet flow condition;
FIG. 4 is a schematic diagram of the overall structure of the present invention under the small aperture jet flow condition;
FIG. 5 is a schematic view of the overall structure of the auxiliary exhaust system of the present invention;
FIG. 6 is a schematic view of a first cam structure according to the present invention;
FIG. 7 is a schematic view of a second cam structure according to the present invention;
FIG. 8 is a schematic view of a plunger stopper structure of a prechamber according to the present invention;
1. The main casing 2, the upper casing 3, the lower casing 4, the upper end cap 5, the first hydraulic control chamber 6, the second hydraulic control chamber 7, the prechamber plunger mounting chamber 8, the prechamber outer chamber 9, the spark plug mounting hole 10, the oil inlet passage 11, the oil return passage 12, the first oil inlet passage 13, the second oil inlet passage 14, the first oil return passage 15, the second oil return passage 16, the outer spray hole 17, the outer scavenging hole 18, the first camshaft through hole 19, the second camshaft through hole 20, the spark plug through hole 21, the spark plug 22, the oil pressure regulating valve 23, the first plunger 24, the second plunger 25, the prechamber plunger stopper 26, the prechamber plunger 27, the the first hydraulic chamber 28, the prechamber plunger return spring 29, the prechamber chamber housing 30, the second hydraulic chamber 31, the prechamber chamber return spring 32, the inner orifice 33, the inner scavenging orifice 34, the hydraulic oil tank 35, the first camshaft 36, the first cam 37, the first plunger return spring 38, the first plunger stopper 39, the second camshaft 40, the second cam 41, the second plunger return spring 42, the second plunger stopper 43, the base circle segment 44, the lift-type segment 45, the first-type segment 46, the second-type segment 47, the third-type segment 48, the prechamber plunger stopper upper half 49, and the prechamber plunger stopper lower half.
Detailed Description
See fig. 1-8: the embodiment provides a hydraulic control's volume and changeable passive prechamber ignition system of orifice, includes:
The main casing 1 comprises an upper casing 2, a lower casing 3 and an upper end cover 4, wherein a first hydraulic control chamber 5, a second hydraulic control chamber 6, a precombustor plunger mounting chamber 7, a precombustor outer chamber 8, a spark plug mounting hole 9, an oil inlet channel 10, an oil return channel 11, a first oil inlet channel 12, a second oil inlet channel 13, a first oil return channel 14 and a second oil return channel 15 are arranged in the main casing 1; the bottom of the precombustion chamber 8 is provided with a plurality of through outer spray holes 16, and the side wall is provided with a plurality of outer scavenging holes 17; the upper shell 2 is fixedly connected with the lower shell 3, and a spark plug mounting hole 9 is vertically formed in the middle of the upper shell 2 and extends into the lower shell 3; the first hydraulic control chamber 5 and the second hydraulic control chamber 6 are provided in the upper housing 2; the prechamber plunger mounting chamber 7 and the prechamber outer chamber 8 are arranged up and down in the lower housing 3; the first oil inlet flow passage 12 and the first oil return flow passage 14 are arranged in the upper shell 2, and the second oil inlet flow passage 13 and the second oil return flow passage 15 are partially arranged in the upper shell 2 and partially arranged in the lower shell 3; the upper end cover 4 is arranged at the top end of the upper shell 2, a first camshaft through hole 18, a second camshaft through hole 19, a spark plug through hole 20, an oil inlet channel 10 and an oil return channel 11 which are vertically communicated are arranged on the upper end cover 4, and the oil inlet channel 10 and the oil return channel 11 are respectively arranged at two sides of the upper part of the upper end cover 4; the oil inlet channel 10 is connected with the first oil inlet channel 12 and the second oil inlet channel 13, and the first oil return channel 14 and the second oil return channel 15 are connected with the oil return channel 11; the upper end cover 4 is also provided with upper bearings and bearing fixing blocks of the first cam shaft 35 and the second cam shaft 39.
The spark plug 21 is arranged in the spark plug mounting hole 9, and the lower end of the spark plug 21 extends into the inner cavity of the precombustion chamber;
The oil pressure regulating valve 22 is arranged on the upper end cover 4 at the upper part of the main shell 1 and is connected with the oil inlet channel 10;
the first plunger 23 is arranged in the first hydraulic control chamber 5, and one end of the first plunger 23 penetrates through a through hole formed in the side wall of the first hydraulic control chamber 5 to selectively close the first oil inlet flow passage 12;
The second plunger 24 is arranged in the second hydraulic control chamber 6, and one end of the second plunger 24 penetrates through a through hole formed in the side wall of the second hydraulic control chamber 6 to selectively close the second oil return flow passage 15;
The prechamber plunger limiting block 25 is in a stepped hollow column shape, and comprises an upper prechamber plunger limiting block half 48 and a lower prechamber plunger limiting block half 49, wherein the prechamber plunger limiting block 25 is arranged in the prechamber plunger mounting chamber 7; the diameter of the upper half 48 of the plunger stopper is larger than that of the lower half 49 of the plunger stopper, and the diameter of the lower half 49 of the plunger stopper is smaller than that of the outer chamber 8;
The precombustor plunger 26, the precombustor plunger 26 is hollow column-shaped, and the outer edge of the upper end is provided with a shoulder; the pre-combustion chamber plunger 26 is sleeved at the lower part of the spark plug mounting hole 9, the inner wall of the pre-combustion chamber plunger limiting block 25, the upper surface of the shoulder of the pre-combustion chamber plunger 26 and the outer wall of the spark plug mounting hole 9 enclose a first hydraulic cavity 27, and the first hydraulic cavity 27 is communicated with the first oil inlet flow passage 12 and the first oil return flow passage 14 and is used for pushing the pre-combustion chamber plunger 26 to axially move; the outer part of the precombustor plunger 26 is sleeved with a precombustor plunger return spring 28, and the upper end and the lower end of the precombustor plunger return spring 28 are respectively abutted between the shoulder of the precombustor plunger 26 and the shoulder of the inner wall of the precombustor plunger limiting block 25;
The precombustor comprises a precombustor inner cavity shell 29, wherein the precombustor inner cavity shell 29 is arranged in a precombustor outer cavity 8, and a shoulder is arranged at the outer edge of the upper end of the precombustor inner cavity shell 29; the upper end of the precombustion chamber housing 29 is positioned between the inner wall of the precombustion chamber 8 and the outer wall of the precombustion chamber plunger limiting block 25, a second hydraulic chamber 30 is formed by surrounding the upper surface of the shoulder of the precombustion chamber housing 29, the inner wall of the precombustion chamber 8 and the outer wall of the precombustion chamber plunger limiting block 25, and the second hydraulic chamber 30 is communicated with the second oil inlet flow channel 13 and the second oil return flow channel 15 and is used for pushing the precombustion chamber housing 29 to axially move; the precombustion chamber return spring 31 is sleeved outside the precombustion chamber inner chamber shell 29, and the upper end and the lower end of the precombustion chamber return spring 31 are respectively abutted between the shoulder of the precombustion chamber inner chamber shell 29 and the boss of the inner wall of the precombustion chamber outer chamber 8; the bottom of the precombustion chamber shell 29 is provided with inner spray holes 32 with the same number as the outer spray holes, and the side wall is provided with inner scavenging holes 33 with the same amount as the outer scavenging holes;
the hydraulic oil tank 34 is connected with the oil pressure regulating valve 22 through an oil inlet pipeline, and is connected with the oil return channel 11 through an oil return pipeline.
The first hydraulic control chamber 5 is internally provided with a first cam shaft 35 and a first cam 36, the lower end of the first cam shaft 35 is pivoted on the lower end cover of the first hydraulic control chamber 5 through a lower bearing, and the upper part of the first cam shaft 35 passes through a through hole at the upper end of the first hydraulic control chamber 5 and a through hole at the upper end of the main shell 1, is connected with an external driving device and is pivoted on the main shell 1 through an upper bearing; the first cam shaft 35 is in sealing fit with the through hole at the upper end of the first hydraulic control chamber 5 and the through hole at the upper end of the main shell 1, so that hydraulic oil leakage is prevented; the first cam 36 is arranged on the first cam shaft 35, and the first cam 36 is in rolling connection with the end face of the first plunger 23; one end of the first plunger 23, which is positioned in the first hydraulic control chamber 5, is provided with a shoulder, a first plunger return spring 37 is sleeved outside the first plunger 23, and two ends of the first plunger return spring 37 are respectively abutted against the shoulder of the first plunger 23 and the inner wall of the first hydraulic control chamber 5.
The first hydraulic control chamber 5 is also provided with a first plunger limiting block 38, and the first plunger 23 is arranged in a limiting channel of the first plunger limiting block 38.
The second hydraulic control chamber 6 is internally provided with a second cam shaft 39 and a second cam 40, the lower end of the second cam shaft 39 is pivoted on the lower end cover of the second hydraulic control chamber 6 through a lower bearing, and the upper part of the second cam shaft 39 passes through the upper end through hole of the second hydraulic control chamber 6 and the upper end through hole of the main shell 1, is connected with an external driving device and is pivoted on the main shell 1 through an upper bearing; the second cam shaft 39 is in sealing fit with the upper through hole of the second hydraulic control chamber 6 and the upper through hole of the main shell 1, so that hydraulic oil leakage is prevented; the second cam 40 is arranged on the second cam shaft 39, and the second cam 40 is in rolling connection with the end face of the second plunger 24; one end of the second plunger 24, which is positioned in the second hydraulic control chamber 6, is provided with a convex shoulder, a second plunger return spring 41 is sleeved outside the second plunger 24, and two ends of the second plunger return spring 41 are respectively abutted against the convex shoulder of the second plunger 24 and the inner wall of the second hydraulic control chamber 6.
A second plunger stopper 42 is further disposed in the second hydraulic control chamber 6, and the second plunger 24 is disposed in a stopper channel of the second plunger stopper 42.
The first cam 36 includes a base circle segment 43 and a lift-type segment 44; the second cam 40 includes a first type line segment 45, a second type line segment 46, and a third type line segment 47; the connection point of the third type line segment 47 and the first type line segment 45 is a first lift point, the connection point of the first type line segment 45 and the second type line segment 46 is a second lift point, and the connection point of the second type line segment 46 and the third type line segment 47 is a third lift point.
The diameter of the inner spray hole 32 at the bottom of the precombustion chamber housing 29 is smaller than the diameter of the outer spray hole 16 at the bottom of the main housing 1.
In the passive pre-chamber ignition system with variable volume and spray holes in hydraulic control provided by the embodiment, an oil inlet channel 10, a first oil inlet channel 12, a first hydraulic cavity 27, a first oil return channel 14 and an oil return channel 11 are formed by surrounding the inner wall of a pre-chamber plunger limiting block 25, the upper surface of a shoulder of a pre-chamber plunger 26 and the outer wall of a spark plug mounting hole 9; one end of the first plunger 23 penetrates through a through hole formed in the side wall of the first hydraulic control chamber 5, selectively closes the first oil inlet flow passage 12, controls hydraulic pressure in the first hydraulic chamber 27, and further controls axial movement of the prechamber plunger 26: the first plunger 23 is retracted, the first oil inlet flow passage 12 is communicated, the hydraulic pressure in the first hydraulic cavity 27 is increased, and the precombustor plunger 26 moves downwards to reduce the precombustor volume; conversely, the first plunger 23 extends to close the first oil inlet passage 12, the hydraulic pressure in the first hydraulic chamber 27 is reduced, the prechamber plunger 26 is reset upward by the prechamber plunger reset spring 28, and the prechamber volume is increased.
The upper surfaces of the oil inlet channel 10, the second oil inlet channel 13 and the shoulder of the precombustion chamber housing 29, a second hydraulic chamber 30 formed by surrounding the inner wall of the precombustion chamber outer chamber 8 and the outer wall of the precombustion chamber plunger limiting block 25, a second oil return channel 15 and the oil return channel 11 form another hydraulic oil passage; one end of the second plunger 24 penetrates through a through hole formed in the side wall of the second hydraulic control chamber 6 to selectively close the second oil return flow passage 15, control hydraulic pressure in the second hydraulic chamber 30 and further control axial movement of the precombustion chamber housing 29: the second plunger 24 is retracted, the second oil return flow passage 15 is communicated, the hydraulic pressure of the second hydraulic chamber 30 is reduced, and the inner scavenging hole 33 on the side wall of the pre-combustion chamber housing 29 is connected with the outer scavenging hole 17 of the main housing 1 under the action of the pre-combustion chamber return spring 31; the second plunger 24 extends out a certain distance to incompletely close the second oil return flow passage 15, the hydraulic pressure in the second hydraulic chamber 30 is increased to a certain extent, the precombustion chamber inner chamber shell 29 moves downwards a certain distance against the force of the precombustion chamber return spring 31, so that the inner scavenging holes 33 on the side wall of the precombustion chamber shell 29 are disconnected with the outer scavenging holes 17 of the main shell 1, the inner spray holes 32 at the bottom of the precombustion chamber shell 29 are not connected with the outer spray holes 16 of the main shell 1, and the spray is in a large-aperture spray state; the second plunger 24 extends completely to close the second oil return flow passage 15, the hydraulic pressure in the second hydraulic chamber 30 is maximum, the precombustion chamber housing 29 overcomes the force of the precombustion chamber return spring 31 and moves downwards to be in contact with the bottom of the main housing 1, the inner scavenging holes 33 on the side wall of the precombustion chamber housing 29 are disconnected with the outer scavenging holes 17 of the main housing 1, the inner spray holes 32 on the bottom of the precombustion chamber housing 29 are connected with the outer spray holes 16 of the main housing 1, and the spray is in a small-aperture spray state.
The first cam 36 includes a base circle segment 43 and a lift-type segment 44; when the first cam 36 works on the base circle segment 43, the first plunger 23 does not close the first oil inlet runner 12; the first cam 36 operates on the lift type segment 44 and reaches the highest point of the lift type segment 44, and the first plunger 23 gradually presses the first oil inlet runner 12 to be completely closed.
The second cam 40 includes a first type line segment 45, a second type line segment 46, and a third type line segment 47; the connection point of the third type line segment 47 and the first type line segment 45 is a first lift point, the connection point of the first type line segment 45 and the second type line segment 46 is a second lift point, and the connection point of the second type line segment 46 and the third type line segment 47 is a third lift point; the first lift point height is less than the second lift point height, and the second lift point height is less than the third lift point height. When the second cam 40 works at the first lift point, the second plunger 24 presses the second oil return flow passage 15 to a certain extent, smaller hydraulic pressure is generated in the second hydraulic cavity 30, the precombustion chamber housing 29 moves downwards to the inner scavenging hole 33 on the side wall of the precombustion chamber housing 29 and is connected with the outer scavenging hole 17 of the main housing 1; when the second cam 40 works at the second lift point, the second plunger 24 further presses the second oil return flow passage 15, the hydraulic pressure in the second hydraulic cavity 30 is increased, the inner scavenging hole 33 of the inner cavity shell 29 of the precombustion chamber is disconnected from the outer scavenging hole 17 of the main shell 1, the inner spray hole 32 at the bottom of the inner cavity shell 29 of the precombustion chamber is not connected with the outer spray hole 16 of the main shell 1, and the spray is in a large-aperture spray state; when the second cam 40 works at the third lift point, the second plunger 24 completely closes the second oil return flow passage 15, the hydraulic pressure in the second hydraulic chamber 30 is maximum, the inner scavenging hole 33 of the precombustion chamber housing 29 is disconnected from the outer scavenging hole 17 of the main housing 1, the inner spraying hole 32 at the bottom of the precombustion chamber housing 29 is connected with the outer spraying hole 16 of the main housing 1, and the jet flow is in a small-aperture jet flow state.
The working procedure of this embodiment is:
(1) Auxiliary air intake condition
The first cam 36 works on the base circle segment 43 and turns to the lift line segment 44, the first plunger 23 is pressed to completely seal the first oil inlet flow channel 12, the hydraulic pressure in the first hydraulic cavity 27 is reduced, the precombustor plunger 26 moves upwards under the upward acting force of the precombustor plunger return spring 28, the precombustor volume is increased, and more mixed gas is led into the precombustor. Meanwhile, the second cam 40 works to a first lift point between the third type line segment 47 and the first type line segment 45, the second plunger 24 opens the second oil return flow passage 15 to enable the pre-combustion chamber inner cavity shell 29 to work at the highest point, the inner scavenging holes 33 on the side wall of the pre-combustion chamber inner cavity shell 29 are connected with the outer scavenging holes 17 of the main shell 1, the air inlet of the pre-combustion chamber is increased, more mixed gas enters the pre-combustion chamber, and the ignition jet flow is facilitated to improve the lean combustion capacity.
(2) Engine jet ignition mixed gas and large aperture jet working condition
The first cam 36 works on the lift type line segment 44 to rotate towards the base circle segment 43, the first plunger 23 releases the closure of the first oil inlet runner 12, the hydraulic pressure in the first hydraulic cavity 27 is gradually increased, the pre-chamber plunger 26 overcomes the downward movement of the pre-chamber plunger return spring 28, meanwhile, the spark plug 21 ignites the mixed gas in the pre-chamber, the mixed gas in the engine cylinder is sprayed out through the spray hole to ignite, when the first cam 36 is incompletely rotated into the base circle segment 43, the volume reduction of the pre-chamber is different along with the different downward movement degrees of the pre-chamber plunger 26 so as to obtain the jet capacities of different thrust, and the rotation degree of the first cam shaft 35 can be adjusted along with the change of working conditions;
the second cam 40 and the first cam 36 work simultaneously, the second cam 40 is turned from the first lift point to the second lift point, when the second cam 40 works to the second lift point, the second plunger 24 partially extrudes the second oil return flow passage 15, the hydraulic pressure in the second hydraulic cavity 30 is increased, the pre-combustion chamber inner cavity shell 29 moves downwards for a certain distance, the inner scavenging hole 33 of the pre-combustion chamber inner cavity shell 29 is disconnected with the outer scavenging hole 17 of the main shell 1, the inner spray hole 32 at the bottom of the pre-combustion chamber inner cavity shell 29 is not connected with the outer spray hole 16 of the main shell 1, at the moment, the spray is not influenced by the inner spray hole 32 and the outer spray hole 16 after spray is sprayed, and the spray enters an engine cylinder for doing work in a large-aperture spray state.
(3) Engine jet ignition mixed gas and small aperture jet working condition
The first cam 36 maintains the last step of rotation and the prechamber plunger 26 continues to move downwards compressing the prechamber volume;
When the second cam 40 works to the third lift point, the second plunger 24 closes the second oil return flow passage 15, the hydraulic pressure in the second hydraulic cavity 30 is maximum, the pre-combustion chamber inner cavity shell 29 moves downwards to be abutted with the main shell 1, the inner scavenging hole 33 of the pre-combustion chamber inner cavity shell 29 is disconnected with the outer scavenging hole 17 of the main shell 1, the inner spray hole 32 at the bottom of the pre-combustion chamber inner cavity shell 29 is connected with the outer spray hole 16 of the main shell 1, and at the moment, the spray enters the engine cylinder for acting in a small-aperture spray state.
(4) Auxiliary exhaust condition
The first cam 36 works on the base circle section 43, at this time, the prechamber plunger 26 moves downwards to the lowest point, meanwhile, the second cam 40 rotates from the third line section 47 to the first line section 45, so that the second plunger 24 is gradually far away from the second oil return flow channel 15, hydraulic oil flows out of the second hydraulic chamber 30, the pressure of the second hydraulic chamber 30 is reduced, the prechamber chamber shell 29 moves upwards under the action of the prechamber chamber return spring 31, at this time, the inner scavenging hole 33 is communicated with the outer scavenging hole 17, the exhaust gas circulation capacity in the prechamber is increased, the prechamber plunger 26 pushes the exhaust gas in the prechamber downwards to be discharged out of the prechamber, and the exhaust gas is swept as far as possible; ready for the next cycle.
Claims (8)
1. A hydraulically controlled variable volume and orifice passive prechamber ignition system comprising:
The device comprises a main shell, wherein a first hydraulic control chamber, a second hydraulic control chamber, a precombustor plunger mounting chamber, a precombustor outer chamber, a spark plug mounting hole, an oil inlet channel, an oil return channel, a first oil inlet channel, a second oil inlet channel, a first oil return channel and a second oil return channel are arranged in the main shell; the first hydraulic control chamber and the second hydraulic control chamber are arranged at the upper part in the main shell, the precombustor plunger mounting chamber is arranged at the middle part in the main shell, and the precombustor outer chamber is arranged at the lower part in the main shell; the spark plug mounting hole is vertically arranged in the main shell; the oil inlet channel and the oil return channel are respectively arranged on the main shell; the oil inlet channel is connected with the first oil inlet channel and the second oil inlet channel, and the first oil return channel and the second oil return channel are connected with the oil return channel; one or a plurality of through outer spray holes are arranged at the bottom of the precombustion chamber, and one or a plurality of outer scavenging holes are arranged on the side wall of the precombustion chamber;
the spark plug is arranged in the spark plug mounting hole, and the lower end of the spark plug stretches into the inner cavity of the precombustion chamber;
the oil pressure regulating valve is arranged at the upper part of the main shell and is connected with the oil inlet channel;
the first plunger is arranged in the first hydraulic control cavity, one end of the first plunger penetrates through a through hole formed in the side wall of the first hydraulic control cavity, and the first oil inlet flow passage is selectively partially or completely closed;
The second plunger is arranged in the second hydraulic control chamber, one end of the second plunger penetrates through a through hole formed in the side wall of the second hydraulic control chamber, and the second oil return flow passage is selectively partially or completely closed;
The precombustor plunger limiting block is in a stepped hollow column shape and is arranged in the precombustor plunger mounting cavity; the diameter of the lower part of the precombustion chamber plunger limiting block is smaller than the diameter of the precombustion chamber outer cavity;
The pre-combustion chamber plunger is hollow and columnar, and a shoulder is arranged at the outer edge of the upper end of the plunger; the pre-combustion chamber plunger is sleeved at the lower part of the spark plug mounting hole, the inner wall of the pre-combustion chamber plunger limiting block, the upper surface of the pre-combustion chamber plunger shoulder and the outer wall of the spark plug mounting hole enclose a first hydraulic cavity, and the first hydraulic cavity is communicated with the first oil inlet flow passage and the first oil return flow passage and is used for pushing the pre-combustion chamber plunger to axially move; the outer part of the precombustor plunger is sleeved with a precombustor plunger reset spring, and the upper end and the lower end of the precombustor plunger reset spring are respectively abutted between the precombustor plunger shoulder and the precombustor plunger limiting block inner wall shoulder;
The precombustion chamber comprises a precombustion chamber housing, a precombustion chamber housing and a support, wherein the precombustion chamber housing is arranged in a precombustion chamber outer chamber, and a shoulder is arranged at the outer edge of the upper end of the precombustion chamber housing; the upper end of the precombustion chamber housing is positioned between the inner wall of the precombustion chamber outer chamber and the outer wall of the precombustion chamber plunger limiting block, the upper surface of the shoulder of the precombustion chamber housing, the inner wall of the precombustion chamber outer chamber and the outer wall of the precombustion chamber plunger limiting block enclose a second hydraulic chamber, and the second hydraulic chamber is communicated with a second oil inlet flow passage and a second oil return flow passage and is used for pushing the precombustion chamber housing to axially move; the outer part of the precombustion chamber inner chamber shell is sleeved with a precombustion chamber reset spring, and the upper end and the lower end of the precombustion chamber inner chamber reset spring are respectively abutted between the precombustion chamber inner chamber shell shoulder and the precombustion chamber inner wall boss; one or a plurality of through inner spray holes are arranged at the bottom of the inner cavity shell of the precombustion chamber, and one or a plurality of inner scavenging holes are arranged on the side wall of the inner spray holes;
the hydraulic oil tank is connected with the oil pressure regulating valve through an oil inlet pipeline and is connected with the oil return channel through an oil return pipeline.
2. A hydraulically controlled variable volume and orifice passive prechamber ignition system as set forth in claim 1 wherein: the first hydraulic control chamber is internally provided with a first cam shaft and a first cam, the lower end of the first cam shaft is pivoted on the lower end cover of the first hydraulic control chamber through a lower bearing, and the upper part of the first cam shaft penetrates through the upper end through hole of the first hydraulic control chamber and the upper end through hole of the main shell, is connected with an external driving device and is pivoted on the main shell through an upper bearing; the first cam shaft is in sealing fit with the through hole at the upper end of the first hydraulic control chamber and the through hole at the upper end of the main shell; the first cam is arranged on the first cam shaft and is in abutting connection with the end face of the first plunger; one end of the first plunger, which is positioned in the first hydraulic control cavity, is provided with a shoulder, a first plunger return spring is sleeved outside the first plunger, and two ends of the first plunger return spring are respectively abutted against the first plunger shoulder and the inner wall of the first hydraulic control cavity.
3. A hydraulically controlled variable volume and orifice passive prechamber ignition system as in claim 2, wherein: the first hydraulic control chamber is internally provided with a first plunger limiting block, and the first plunger is arranged in a limiting channel of the first plunger limiting block.
4. A hydraulically controlled variable volume and orifice passive prechamber ignition system as set forth in claim 1 wherein: the second cam shaft and the second cam are arranged in the second hydraulic control cavity, the lower end of the second cam shaft is pivoted on the lower end cover of the second hydraulic control cavity through a lower bearing, and the upper part of the second cam shaft penetrates through the upper end through hole of the second hydraulic control cavity and the upper end through hole of the main shell, is connected with an external driving device and is pivoted on the main shell through an upper bearing; the second cam shaft is in sealing fit with the through hole at the upper end of the second hydraulic control chamber and the through hole at the upper end of the main shell; the second cam is arranged on the second cam shaft and is abutted against the end face of the second plunger; one end of the second plunger, which is positioned in the second hydraulic control chamber, is provided with a convex shoulder, a second plunger return spring is sleeved outside the second plunger, and two ends of the second plunger return spring are respectively abutted against the convex shoulder of the second plunger and the inner wall of the second hydraulic control chamber.
5. A hydraulically controlled variable volume and orifice passive prechamber ignition system as in claim 4 wherein: and a second plunger limiting block is further arranged in the second hydraulic control cavity, and the second plunger is arranged in a limiting channel of the second plunger limiting block.
6. A hydraulically controlled variable volume and orifice passive prechamber ignition system as set forth in claim 1 wherein: the first cam comprises a base circle segment and a lift type segment;
The second cam comprises a first type line segment, a second type line segment and a third type line segment; the connection point of the third line segment and the first line segment is a first lift point, the connection point of the first line segment and the second line segment is a second lift point, and the connection point of the second line segment and the third line segment is a third lift point.
7. A hydraulically controlled variable volume and orifice passive prechamber ignition system as set forth in claim 1 wherein: the main shell comprises an upper shell, a lower shell and an upper end cover, wherein the upper shell is fixedly connected with the lower shell, and a spark plug mounting hole is vertically arranged in the middle of the upper shell and extends into the lower shell; the first hydraulic control chamber and the second hydraulic control chamber are arranged in the upper shell; the precombustor plunger mounting chamber and precombustor chamber are arranged up and down in the lower housing; the first oil inlet flow passage and the first oil return flow passage are arranged in the upper shell, one part of the second oil inlet flow passage and one part of the second oil return flow passage are arranged in the upper shell, and the other part of the second oil inlet flow passage and the second oil return flow passage are arranged in the lower shell; the upper end cover is arranged at the top end of the upper shell, and is provided with a first cam shaft through hole, a second cam shaft through hole, a spark plug through hole, an oil inlet channel and an oil return channel which are communicated up and down; the oil pressure regulating valve is arranged on the upper end cover; the upper end cover is also provided with an upper bearing of the first cam shaft and the second cam shaft and a bearing fixing block.
8. A hydraulically controlled variable volume and orifice passive prechamber ignition system as set forth in claim 1 wherein: the diameter of the inner spray hole at the bottom of the inner cavity shell of the precombustion chamber is smaller than that of the outer spray hole at the bottom of the main shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410494970.5A CN118327770A (en) | 2024-04-24 | 2024-04-24 | A hydraulically controlled passive pre-chamber ignition system with variable volume and nozzle holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410494970.5A CN118327770A (en) | 2024-04-24 | 2024-04-24 | A hydraulically controlled passive pre-chamber ignition system with variable volume and nozzle holes |
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| CN118327770A true CN118327770A (en) | 2024-07-12 |
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|---|---|---|---|
| CN202410494970.5A Pending CN118327770A (en) | 2024-04-24 | 2024-04-24 | A hydraulically controlled passive pre-chamber ignition system with variable volume and nozzle holes |
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| CN (1) | CN118327770A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141060A (en) * | 1996-11-07 | 1998-05-26 | Isuzu Ceramics Kenkyusho:Kk | Variable sub-chamber gas engine |
| US20060219210A1 (en) * | 2005-03-30 | 2006-10-05 | Brett Bailey | Internal combustion engine with variable volume prechamber |
| DE102016015259A1 (en) * | 2016-12-21 | 2017-07-06 | Daimler Ag | Otto engine for a motor vehicle, in particular for a motor vehicle |
| US20210340899A1 (en) * | 2020-05-04 | 2021-11-04 | Southwest Research Institute | Passive Pre-Chamber Ignition with Varying Nozzle Sizes for Internal Combustion Engine |
| US11512624B1 (en) * | 2021-12-07 | 2022-11-29 | Ford Global Technologies, Llc | Systems and methods for adjustable pre-chamber |
-
2024
- 2024-04-24 CN CN202410494970.5A patent/CN118327770A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141060A (en) * | 1996-11-07 | 1998-05-26 | Isuzu Ceramics Kenkyusho:Kk | Variable sub-chamber gas engine |
| US20060219210A1 (en) * | 2005-03-30 | 2006-10-05 | Brett Bailey | Internal combustion engine with variable volume prechamber |
| DE102016015259A1 (en) * | 2016-12-21 | 2017-07-06 | Daimler Ag | Otto engine for a motor vehicle, in particular for a motor vehicle |
| US20210340899A1 (en) * | 2020-05-04 | 2021-11-04 | Southwest Research Institute | Passive Pre-Chamber Ignition with Varying Nozzle Sizes for Internal Combustion Engine |
| US11512624B1 (en) * | 2021-12-07 | 2022-11-29 | Ford Global Technologies, Llc | Systems and methods for adjustable pre-chamber |
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