EP4069963A1 - Brennstoffeinspritzventil mit einem schieberventil für verbrennungskraftmaschinen - Google Patents
Brennstoffeinspritzventil mit einem schieberventil für verbrennungskraftmaschinenInfo
- Publication number
- EP4069963A1 EP4069963A1 EP20812106.1A EP20812106A EP4069963A1 EP 4069963 A1 EP4069963 A1 EP 4069963A1 EP 20812106 A EP20812106 A EP 20812106A EP 4069963 A1 EP4069963 A1 EP 4069963A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- throttle
- slide valve
- control
- valve body
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
Definitions
- the present invention relates to a
- Fuel injection valve for intermittent fuel injection into the combustion chamber of an internal combustion engine according to the preamble of claim 1.
- a fuel fine injection valve of this type is known from document EP 1 273 791 A2.
- the fuel injection valve shown in Fig. 6 of this document has a slide valve body guided in a close sliding fit in a hollow cylindrical sleeve, which has a first end face facing a control chamber and a second end face opposite this.
- a throttle admission runs from the second end face to the first end face, the throttle admission having a throttle constriction at a distance from the second end face as well as at a further distance from the first end face.
- a throttle passage runs from the first end face to the second end face, which has a further throttle constriction at the same intervals as in the case of the throttle admission.
- a throttle inlet running in the radial direction is formed on the slide valve body and opens into the throttle passage.
- a stationary control body forms with its front side facing the slide valve body a slide valve seat which interacts with the second front side of the slide valve body.
- the control body has a flow-out from the front, permanently connected to the flow and by means of the throttle passage a pilot valve with a low-pressure chamber connectable and separable from this control passage.
- the throttle passage and the control passage are continuous via the throttle inlet . fluidly connected to the high pressure chamber.
- the slide valve body from the slide valve seat forms a gap, via which the throttle passage and the control passage and also the throttle inlet are fluidically connected to the high-pressure chamber.
- the eccentrically formed adhesion surface between the second end face of the slide valve body and the front side of the control body lead to a delay in the response of the fuel injector in order to terminate an injection process.
- the production is complex, since the slide valve body must be designed precisely and in particular the throttle constrictions of the throttle admission, the throttle passage and the
- Throttle inlet must be manufactured with very small tolerances. It is therefore an object of the present invention to develop a generic fuel injector in such a way that the delay in response is minimized with simple manufacture.
- the fuel injector for intermittent fuel injection into the combustion chamber of a
- Internal combustion engine has a housing with a high pressure inlet for the under very high pressure, up to 2000 bar or more, standing fuel and an injector seat.
- a high pressure chamber runs inside the housing from the high pressure inlet to the injection valve seat.
- an injection valve member is arranged longitudinally movable, which in the direction against the
- the injection valve seat is loaded with the force of a closing spring and is intended to interact with the injection valve seat.
- the injection valve member rests against the injection valve seat and thereby prevents, in a known manner, the injection of fuel from the high-pressure chamber into the combustion chamber of the internal combustion engine.
- the injection valve member is, against the force of the closing spring, from
- Injector seat lifted off.
- the injection valve member then comes to rest on the injection valve seat again.
- a double-acting control piston is formed on the injection valve member and delimits the high-pressure chamber with its side facing the injection valve seat and a control chamber with its side facing away from the injection valve seat.
- the control chamber is preferably delimited on the circumferential side by a preferably hollow cylindrical sleeve on which the control piston is slidably guided in a tight fit and on which the closing spring is supported, which on the other hand is supported on the injection valve member and acts on this with its spring force in the direction of the injection valve seat.
- the control piston can be slidably guided on the housing itself or on a differently designed component arranged in the housing, the housing or the component delimiting the control space on the circumferential side.
- a slide valve body is guided freely movable in the direction of the longitudinal axis. This has a first end face that faces the control chamber and delimits it, and a second end face that faces away from the control chamber in the longitudinal direction.
- the slide valve body preferably has an outer wall which is at least approximately rotationally symmetrical with respect to the longitudinal axis.
- this sliding fit is also formed on the sleeve or on the housing or component.
- a control body is arranged in the housing, fixed to the housing with respect to this, which with its front side facing the slide valve body forms a slide valve seat which interacts with the second end side of the slide valve body.
- the sleeve is preferably held in contact with the control body by means of the force of the closing spring acting on it.
- the slide valve body has a throttle passage arranged between the first end face and the second end face.
- the control body has a front side which extends from its front side, is permanently connected to the flow and connected to the flow at the other end by means of a Pilot valve with a low-pressure chamber connectable and separable from this control passage.
- a preferred constriction of the control passage is located in an end region of the control passage facing the low-pressure chamber.
- This control passage and the throttle passage can be used to terminate at least one throttle inlet formed on the slide valve body
- Injection process preferably be permanently connected to the high pressure chamber.
- the slide valve body furthermore has a throttle inlet which emanates from the second end face and opens into the control chamber, which is closed by the control body when the slide valve body is in contact with the control body.
- Throttle admission are connected to the high pressure chamber.
- the sleeve may have a passage connected to the high pressure chamber in its end region facing the control body.
- a blind hole-shaped recess extending from its first end face is formed on the slide valve body, which recess is central to the longitudinal axis and is preferably rotationally symmetrical. From this recess, preferably from its bottom, which is preferably flat and runs at right angles to the longitudinal axis, the throttle passage extending towards the second end face goes away and the throttle admission coming from the second end face opens into this recess, preferably in the area of its bottom.
- the recess extends from the first end face of the slide valve body, its volume is part of the control chamber.
- the recess enables both the throttle passage and the throttle admission to be designed to be shorter than is known from the prior art, which simplifies their manufacture.
- the inventive design of the slide valve body enables the formation of the
- Throttle passage and the throttle admission close to each other and close to the longitudinal axis.
- An adhesion surface formed with considerable eccentricity to the longitudinal axis between the control body and the slide valve body can thereby be avoided;
- the adhesion surface has a lower eccentricity compared to the prior art.
- the response behavior of the fuel injector is improved compared to the prior art.
- there is less delay in response i.e. there is a quicker response to terminating an injection process
- the symmetrical pressure distribution also improves the stability of the movement of the slide valve body, which is particularly important in the case of multiple injections and what smooths out the operating behavior of identically designed fuel injectors.
- the throttle passage preferably has a preferably pocket-shaped depression formed on the slide valve body, open towards the second end face, into which both the throttle section of the throttle passage developing the throttling effect and, if present, the throttle inlet open.
- the throttle section preferably extends in a straight line from the recess to the depression.
- This recess makes it possible to arrange the throttle passage and, if necessary, its throttle section close to the longitudinal axis and still ensure the permanent connection between the control passage and the throttle passage. Furthermore, the recess enables the throttle inlet, which may be present and which preferably runs in the radial direction to the longitudinal axis, to be designed with a short length, which also supports the simple manufacture of the slide valve body.
- the reduced length of the throttle passage or its throttle section as a result of the recess and possibly the depression compared to the prior art enables the throttle passage or the throttle section to be designed with a constant cross section or conical over its entire length. In the case of a conical design, the taper runs in the direction from the first end face and thus from the control chamber to the second end face.
- the throttle admission has a larger cross section than the throttle passage or its throttle section, it can be designed with a constant cross section over its entire length.
- a throttle inlet is present and this opens into the recess, it is preferably designed with a constant cross section or conical over its entire length. In the case of a conical design, the taper runs in the direction of the depression. It is also possible, in order to improve the flow stability and flow equality, to round off the inlet edge of the throttle inlet facing the high pressure chamber. The short length of the throttle inlet enables a cheap one
- the recess preferably has the shape of a rectangle with rounded corners, the long sides preferably extending parallel to a radial to the longitudinal axis and the short sides extending at right angles thereto.
- the throttle section preferably opens into the recess adjacent to the radially inner end of the recess. Furthermore, this embodiment enables a particularly small length of the throttle inlet.
- the throttle passage optionally its throttle section, as well as the throttle admission, preferably run in a straight line and parallel to the longitudinal direction, which enables the throttle passage and the throttle admission to be produced with a single machine setup. Furthermore, the distance between the recess and the throttle admission can be made small, since the partition wall between them is only of a short length, measured in the direction of the longitudinal axis.
- the wall of the throttle admission preferably extends at least approximately along the longitudinal axis or adjacent to it. This enables only a slight eccentricity and a design of the adhesion surface that is at least almost rotationally symmetrical with respect to the longitudinal axis.
- the throttle passage and the recess are preferably arranged diametrically to the throttle inlet. What enables space-saving training.
- the second end face preferably has an annular, closed mouth sealing bead running around the mouth of the throttle inlet on this side and one along the radial outer wall of the
- Slider valve body extending, self-contained annular sealing bead.
- the mouth sealing bead and the annular sealing bead are intended to act in a sealing manner with the slide valve seat of the control body when the slide valve body is in contact with the control body.
- the mouth sealing bead and the annular sealing bead have a small height, measured in the longitudinal direction.
- the mouth sealing bead preferably delimit radially on the inside and the annular sealing bead radially on the outside an annular disk-shaped front indentation into which the throttle passage opens and from which the indentation extends, if necessary.
- the sealing surfaces between the slide valve body and the control body can be kept small, which leads to a further reduction in the adhesive forces.
- the one forming the slide valve seat is preferred
- the front of the control body is flat. This enables simple manufacture of the control body and ensures a cleanly sealing slide valve seat.
- a spring element is preferably arranged in the recess, which is located on the one hand in the recess on the slide valve body and on the other hand on the
- Injection valve member is supported.
- This spring element is to keep the slide valve body in contact with the control body when the pressure force conditions are balanced.
- the recess preferably has a shoulder on which the spring element is supported with its end on this side.
- the spring element can be made smaller compared to the prior art, which enables a reduction in the volume of the control chamber and thus a faster response behavior, in particular when an injection process is triggered.
- the depth of the recess measured from the first end face in the direction of the longitudinal axis is preferred, i.e. from the first end face to the bottom of the recess, at least half as long as the distance between the first end face and the second end face of the slide valve body.
- the depth is preferably at least approximately three quarters of this distance. On the one hand, this enables a very short length of the
- the smallest cross section of the recess is preferably at least five times as large as the sum of the
- the recess for the throttle inlet and the throttle passage does not represent a throttle constriction for the fuel.
- the throttle passage and the control passage are connected to the high-pressure chamber via the throttle inlet formed on the slide valve body, preferably continuously, but at least at the end of an injection process. This supports a very rapid termination of an injection process, in which, with the control passage closed, fuel flows through the
- Throttle inlet can flow.
- the slide valve body is preferably provided in an end region adjoining the second end face, radially on the outside, with a circumferential outer taper, which is acted upon by the high pressure fuel.
- an annular surface that acts as a compressive force is generated, which leads to a compressive force directed away from the control body and towards the control chamber. This supports or in the absence of a throttle inlet causes the lifting of the
- the slide valve body lifts off the control body as soon as the force of the fuel acting on the second end face, together with the above-mentioned pressure force, is greater than that of the fuel in the control chamber and the spring element that may be present force acting on the slide valve body.
- fuel flows into the control chamber via the gap formed in this way and the throttle inlet and throttle passage, which leads to a rapid pressure increase in the control chamber and an associated movement of the injection valve member onto the injection valve seat.
- the advantage of this variant is that no fuel can flow from the high-pressure chamber into the control passage during an injection process, which means lower fuel consumption for the control of the injection valve. Furthermore, when the control passage is opened to trigger an injection process, the pressure reduction in the control chamber faster, which leads to a rapid lifting of the injection valve member from the injection valve seat.
- Fig. 1 is a longitudinal section through a
- Fuel injection valve for intermittent fuel injection into the combustion chamber of an internal combustion engine
- FIG. 2 also in longitudinal section and, compared with FIG. 1, enlarges the detail of the section designated there by the rectangle II
- FIG. 3 likewise in longitudinal section and, compared with FIG. 2, enlarged the detail of the fuel injector designated there by the rectangle III; FIG.
- Fig. 4 is a longitudinal section through a
- Fig. 6 in a perspective view obliquely from above the
- Slide valve body according to FIGS. 4 and 5; and 7 shows the slide valve body according to FIGS. 4 to 3 in a perspective view obliquely from below
- the fuel injector 10 shown in a longitudinal section in FIGS. 1 to 3, for intermittent fuel injection into the combustion chamber 12 of an internal combustion engine has a housing 14 on which a high-pressure inlet 16 on the one hand and an injector seat 18 on the other hand are formed.
- a high pressure chamber 20 extends inside the housing 14 from the high pressure inlet 16 to the injection valve seat 18.
- Fuel which is under very high pressure is fed to the high-pressure chamber 20 in a known manner through the high-pressure inlet 16.
- a needle-shaped injection valve member 22, which interacts with the injection valve seat 18, is arranged and guided in the housing 14 so as to be longitudinally movable.
- a closing spring 24 is supported on the injection valve member 22 and applies a spring force to it in the direction against the injection valve seat 18.
- a double-acting control piston 26 is formed thereon. Its piston surface 28 facing the injection valve seat 18 delimits the high-pressure chamber 20 and is thus under high pressure with the standing fuel applied. With its end face 30 facing away from injection valve seat 18, control piston 16 delimits a control chamber 32.
- control piston 26 is slidably guided in a narrow fit 34 in a hollow cylindrical control sleeve 36, which is designed to be rotationally symmetrical to a longitudinal axis 38. This falls in the shown
- the control sleeve 36 delimits the control chamber 32 on the circumferential side and the closing spring 24 is supported on its end facing the injection valve seat.
- a cylindrical slide valve body 42 is movably guided in the direction of the longitudinal axis 38 in a tight sliding fit 40 which defines the longitudinal axis 38.
- the slide valve body 42 has a first end face 44 facing the control chamber 32 and thus the control piston 26 and a second end face 46 opposite this and thus facing away from the control piston 26.
- a throttle passage 48 is arranged between the first end face 44 and the second end face 46.
- control body 50 which is fixed to the housing and which, with its front side 52 facing the slide valve body 42 and flat in the example shown, forms a slide valve seat 54 cooperating with the second end face 46 of the slide valve body 42.
- the control sleeve 36 rests with its end on this side, which is held in contact there by the closing spring 24.
- the control sleeve 36 has at least one passage 56 connected to the high-pressure chamber 20.
- a control passage 58 runs through the control body 50, which on the side of the control body 58 facing away from the front side 52 can be connected to and separated from a low-pressure chamber 62 by means of a pilot valve 60.
- the narrowest point of the control passage 58 is located in the end section of the control passage 58 facing the low-pressure space.
- fuel flowing into the low-pressure chamber 62 is returned to a fuel tank via a fuel return line.
- the throttle passage 48 and the control passage 58 are continuously fluidly connected to one another.
- throttle passage 48 and the control passage 58 are permanently fluidly connected to the high-pressure chamber 20 via a throttle inlet 64 formed on the slide valve body 42; In the exemplary embodiment shown, namely via the passage 56 of the control sleeve 36.
- slide valve body 42 has a throttle admission 66 starting from the second end face 46 and opening into the control chamber 32. This is at am Control body 50 adjacent slide valve body 42 closed.
- slide valve body 42 moves away from the control body 50, a gap 68 is formed between them, which is also connected to the high pressure chamber 20 via the passage 56 and via which the throttle passage 48 and the control passage 58 and the throttle inlet 66 are also connected to the high pressure chamber 20 become.
- slide valve body 42 On slide valve body 42 is one of the first
- a throttle section 74 of the throttle passage 48 and the throttle inlet 66 have a continuous circular cylinder shape and run parallel to the longitudinal axis 38.
- the throttle inlet 66 adjoins the longitudinal axis 38 and runs diametrically opposite, with a radial distance from the longitudinal axis 38, the throttle section 74 .
- throttle section 74 from the recess 70, preferably over the entire length to taper conically and / or to round the edge between the bottom 72 and the throttle section 74.
- the throttle section 74 opens into a pocket-shaped recess 76 which belongs to the throttle passage 48 and is cut out on the slide valve body 42 from the second end face 46.
- the throttle inlet 64 which extends in the radial direction relative to the longitudinal axis 38, also opens into this pocket-shaped recess 76
- Throttle inlet 64 and diametrically opposite it are each cut in a tangential bevel 78 on slide valve body 42 in order to ensure a low-loss inflow of fuel and symmetrical pressure force ratios and to enable better processing of throttle inlet 64.
- the pocket-shaped depression 76 which is open over the entire surface toward the second end face 46, is cuboid with rounded edges.
- the long sides 80 are parallel to the radial to which the
- Throttle inlet 64 is formed centrally.
- the short sides 82 run at right angles thereto. Radially on the inside, the throttle passage 48 is thus separated from the throttle inlet 66 over the entire axial length by a thin wall.
- the second end face 46 has one around the this side
- the closed, annular mouth sealing bead 86 running around the mouth 84 of the throttle admission 66 on.
- the second end face 46 has a self-contained, circular ring sealing bead 90.
- the ring sealing surfaces at the axially free end of the mouth sealing bead 86 and the ring sealing bead 90 lie in a common plane which runs at right angles to the longitudinal axis 38.
- the mouth sealing bead 86 and the annular sealing bead 90 interact with the slide valve seat 54 formed by the front side 52 of the control body 50.
- An annular disk-shaped end recess 92 is delimited radially on the inside by the mouth sealing bead 86 and radially outside by the annular sealing bead 90.
- the pocket-shaped recess 76 is open over the full area towards the front recess 92.
- the depth of the front recess 92 and thus the height of the mouth sealing bead 86 and the annular sealing bead 90 are small; for example between 0.05 mm and 0.20 mm.
- the lateral surface 88 is designed to taper conically towards the end of the slide valve body 42 on this side, reaching into the chamfers 78, with an external taper 148, in the exemplary embodiment shown. This ensures that in this area around the slide valve body 42 there is always fuel under high pressure and thus symmetrical hydraulic forces act on the slide valve body 42.
- annular recess 94 which is present radially on the inside in the end region on this side of the control sleeve 36, see FIG. 3, and which is connected to the high-pressure chamber 20 via the passage 56.
- the recess 70 of the slide valve body 42 which has a circular cross section over its entire length, extends in the direction of the longitudinal axis 38 and from the first end face 44 measured, over a length L of about three quarters of the distance A between the first end face 44 and the second end face 46. Approximately in the middle between the first end face 44 and the second end face 46, the recess 70 has a shoulder 96 which narrows the cross section As shown in FIGS. 1 to 3, a spring element 98 is supported.
- the recess has a conical taper 100 at approximately one third of the distance A between the first face 44 and the second face 46. This ensures that the spring element 98 is securely held with its end region on this side between the conical taper 100 and the shoulder 96, but does not lie against the slide valve body 42 between the first end face 44 and the conical taper 100.
- the smallest cross section of the recess 70 in the circular cylindrical section between the shoulder 96 and the bottom 72 of the recess 70 is approximately eight times larger than the sum of the cross sections of the throttle inlet 66 and the throttle passage 48 up to the shoulder 96, this ratio is even greater, even when the spring element 98 is inserted. Consequently, the recess 70 has no throttling effect on the fuel which flows through the throttle inlet 66 and the throttle passage 48.
- first end face 44 can be seen particularly well from FIGS. 4 and 7.
- the stop cams 104 are intended to interact with a stop shoulder 106 (see FIG. 3) formed on the control sleeve 36 on the inside thereof.
- the end face 30 of the injection valve member 80 facing the slide valve body 42 has a central protruding knob 108 around which the end region of the spring element 98 on this side engages. As a result, the spring element 98 is also held centrally on this side.
- the spring force generated by the spring element 98 is small compared to that of the closing spring 24, but guarantees that the slide valve body 42 rests against the control body 50 on both sides of the slide valve body 42 when there is hydraulic pressure equalization.
- the slide valve body 42 can thus move back and forth between the stop shoulder 106 and the control body 50 by the stroke designated by H2 in FIG. 3.
- Fig. 3 is the slide valve body 42 on the
- Stop shoulder 106 is shown resting and thus lifted from the control body 50 by the maximum stroke H2.
- the maximum stroke of the injection valve member 22 is also indicated in FIG. 3 with Hl. In the position shown in FIG. 3, the injection valve member 22 rests on Injector seat 18 on. However, this maximum stroke Hl is only possible when the slide valve body 42 is in contact with the control body 50.
- stop cams 104 also ensure minimal adhesion conditions between the slide valve body 42 and the injection valve member 22.
- the close fit 34 for the control piston 26 has a tolerance of 2 pm to 10 pm and the sliding fit 40 for the slide valve body 40 also has a tolerance of 2 pm to 10 pm.
- the stroke H2 of the control piston 26 has a tolerance of 2 pm to 10 pm and the sliding fit 40 for the slide valve body 40 also has a tolerance of 2 pm to 10 pm.
- Slide valve body 42 is approximately 0.04 mm to approximately 0.10 mm and the stroke Hl of the injection valve member 22 is approximately 0.30 mm to approximately 0.50 mm, depending on the size of the combustion chambers 12 of the internal combustion engine.
- the diameter of the throttle inlet 66 is, for example, about 0.30 mm to about 0.80 mm, of the throttle section 74 about 0.10 mm to about 0.25 mm, of the throttle inlet 64 about 0.10 mm to approx. 0.25 mm and the narrowest point of the control passage approx. 0.20 mm to approx. 0.45 mm.
- the housing 14 has an essentially circular-cylindrical storage body 110, on which the high-pressure inlet 16 is formed on the end face. From the high pressure inlet 16 to one facing away from it End area of the storage body 110 runs a blind hole-like bore, which is a discrete
- Storage chamber 112 forms.
- a frustoconical support 114 with a cup-shaped filter 116 for the fuel is inserted into this blind hole-like bore from the high pressure inlet 16.
- the carrier 114 can also be designed as a valve carrier with a check valve, as is known from the document WO 2014/131497 A1. From the bottom of the blind hole-like bore forming the discrete storage chamber 112 to the front face of the storage body 110 on this side, with respect to FIG.
- a section of a fuel channel 118 Longitudinal axis 38 running obliquely in the radial direction towards the outside, a section of a fuel channel 118. With regard to this section of fuel channel 118, radially opposite to longitudinal axis 38, a bore 120 extends in this from this end face of storage body 110 to an electrical control connection 122. From the control terminal 122 to a connector 124, an electrical control line of the pilot valve '60 extends in the bore 120 126 for control.
- a generally known, electromagnetic actuator 128 is accommodated in an intermediate body 130 of the housing 14, which rests sealingly on the storage body 110 on the end face facing away from the high pressure inlet 16.
- the coil of the actuator 128 is electrically connected to the connector 124.
- a second section of the fuel channel 118 runs laterally of the actuator 128 parallel to the longitudinal axis 38 through the intermediate body 130.
- the pilot valve 60 has a plunger 132 - FIGS. 2 and 3 - which is actuated by the actuator 128 to the
- Positioning pins is set.
- a nozzle body 134 on which the injection valve seat 18 is formed, rests in a sealing manner on the end face of the intermediate body 130 facing away from the accumulator body 110.
- a union nut 136 is supported on one
- the outer shoulder of the nozzle body 134 takes off, accommodates the intermediate body 130 and is threaded with its internal thread onto an external thread of the storage body 110, so that the nozzle body 134 rests on the intermediate body 130 and the latter on the storage body 110 in a sealing manner.
- a third section of the fuel channel 118 runs in the nozzle body 134, from the second section in the
- control body 50 which lies sealingly on the end face of the intermediate body 130 and whose rotational position is on the one hand in the
- Control body 50 inserted and on the other hand in the intermediate body 130 engaging positioning pin 140 is determined.
- Another positioning pin 142 engages on the one hand in the nozzle body 134 and on the other hand in the intermediate body 130 in order to fix their mutual rotational position.
- control recess 138, the fuel channel 118 and the discrete storage chamber 112 form the high-pressure space 20.
- control recess 138 In a guide section of the nozzle body 134 facing the injection valve seat 18, the control recess 138 is designed in the shape of a circular cylinder.
- the injection valve member 122 located in the control recess 138 is also shown on the guide section
- Guide projections 144 which are spaced apart from one another in the circumferential direction and run in the direction of the longitudinal axis 38 are guided freely movable in the direction of the longitudinal axis 38. Between the guide projections 144, the fuel can reach the injection valve seat 18 practically unhindered.
- Injection valve seat 18 are formed on nozzle body 134 in a known manner, nozzle passages 146 through which fuel is injected into combustion chamber 12 during an injection process.
- the control sleeve 136 is located in a central section of the control recess 138 and is held in contact with the control body 50 by the closing spring 24, the closing spring 24 being supported on the other hand on the injection valve member 22.
- both the double-acting control piston 26 and the slide valve body 42 guided in a close sliding fit 40 on the control sleeve 36 between it and the control body 50 are arranged in the control sleeve 36.
- the fuel injector 10 functions as follows:
- the slide valve body 42 lies with its second end face 46 on the front face 52 of the control body 50 in a sealing manner.
- Fuel under high pressure is located in the control chamber 32, in the control passage 58, in the throttle inlet 66, in the throttle passage 48 and in the end recess 92, the injection valve member 22 resting against the injection valve seat 18.
- the actuator 128 is excited, as a result of which the pilot valve 60 connects the control passage 58 to the low-pressure chamber 62 by lifting the plunger 132 from the control body 50. Since the narrowest hydraulic cross-section of the control passage 58 is larger than the flow cross-section of the throttle inlet 64, fuel flows from the control chamber 32 through the throttle passage 48 to the low-pressure chamber 62, which leads to a rapid pressure drop in the control chamber 32 and an associated lifting of the injection valve member 22 from the
- Injector seat 18 leads. As soon as that
- the actuator 128 is de-energized, as a result of which the tappet 132 of the pilot valve 60 rests against the control body 50 and thereby closes the control passage 58. Since fuel can no longer flow out into the low-pressure chamber 62, but fuel continues to flow through the throttle inlet 64, the pressure of the fuel in the control passage 58 increases in FIG the recess 76 and thus in the front recess 92 faster than in the control chamber 32, in which fuel can be replenished less quickly through the throttle section 74 of the throttle passage 48.
- the increased pressure of the fuel on the second end face 46 compared to the lower pressure on the first end face 44 together with the compressive force on the annular surface means that the slide valve body 42 quickly lifts off the control body 50, thereby forming the gap 68 between them. This leads to a more rapid one via the throttle admission 66
- Slider valve body 42 otherwise have the same design as described and shown in the figures.
- the mode of operation when initiating an injection process is the same as that described above, with the exception that no fuel can flow in from the high-pressure chamber 20 and the pressure drop in the control chamber 32 therefore takes place somewhat faster. If the control passage 58 is closed to end an injection process, the lifts Slide valve body 42 from the control body 50 as soon as the force of the fuel acting on the second end face 46, together with the above-mentioned pressure force on the annular surface, is greater than that of the fuel in the control chamber 32 and the possibly existing spring element 98 on the slide valve body
- Control chamber 32 which leads to a rapid increase in pressure in control chamber 32 and an associated movement of injection valve member 22 onto injection valve seat 18.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH15272019 | 2019-12-03 | ||
| PCT/EP2020/084089 WO2021110663A1 (de) | 2019-12-03 | 2020-12-01 | Brennstoffeinspritzventil mit einem schieberventil für verbrennungskraftmaschinen |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4069963A1 true EP4069963A1 (de) | 2022-10-12 |
| EP4069963B1 EP4069963B1 (de) | 2025-05-21 |
| EP4069963C0 EP4069963C0 (de) | 2025-05-21 |
Family
ID=68982415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20812106.1A Active EP4069963B1 (de) | 2019-12-03 | 2020-12-01 | Brennstoffeinspritzventil mit einem schieberventil für verbrennungskraftmaschinen |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4069963B1 (de) |
| JP (1) | JP7773978B2 (de) |
| CN (1) | CN114761681B (de) |
| WO (1) | WO2021110663A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20260017379A (ko) | 2023-05-30 | 2026-02-05 | 간제르-히드로막 아게 | 연료 인젝션 밸브 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2344695T3 (es) * | 2001-07-03 | 2010-09-03 | Crt Common Rail Technologies Ag | Valvula de inyeccion de combustible para motores de combustion interna. |
| WO2005019637A1 (de) * | 2003-08-22 | 2005-03-03 | Ganser-Hydromag Ag | Pilotventil gesteuertes brennstoffeinspritzventil |
| CH697562B1 (de) * | 2005-08-09 | 2008-11-28 | Ganser Hydromag | Brennstoffeinspritzventil. |
| JP4513831B2 (ja) * | 2007-01-31 | 2010-07-28 | 株式会社デンソー | インジェクタ |
| DE102012202549A1 (de) * | 2012-02-20 | 2013-08-22 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
| DE102012223934B4 (de) * | 2012-12-20 | 2015-10-15 | Continental Automotive Gmbh | Piezoinjektor |
| JP5796567B2 (ja) * | 2012-12-26 | 2015-10-21 | 株式会社デンソー | 燃料噴射弁 |
| US9803603B2 (en) | 2013-03-01 | 2017-10-31 | Ganser-Hydromag Ag | Device for injecting fuel into the combustion chamber of an internal combustion engine |
| FR3027350B1 (fr) * | 2014-10-20 | 2019-10-04 | Delphi Technologies Ip Limited | Injecteur de carburant |
| JP6256440B2 (ja) * | 2015-06-26 | 2018-01-10 | 株式会社デンソー | インジェクタ |
-
2020
- 2020-12-01 EP EP20812106.1A patent/EP4069963B1/de active Active
- 2020-12-01 WO PCT/EP2020/084089 patent/WO2021110663A1/de not_active Ceased
- 2020-12-01 JP JP2022533567A patent/JP7773978B2/ja active Active
- 2020-12-01 CN CN202080083944.3A patent/CN114761681B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021110663A1 (de) | 2021-06-10 |
| CN114761681A (zh) | 2022-07-15 |
| JP2023504727A (ja) | 2023-02-06 |
| CN114761681B (zh) | 2024-01-16 |
| EP4069963B1 (de) | 2025-05-21 |
| EP4069963C0 (de) | 2025-05-21 |
| JP7773978B2 (ja) | 2025-11-20 |
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