EP2185808A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP2185808A1 EP2185808A1 EP08774908A EP08774908A EP2185808A1 EP 2185808 A1 EP2185808 A1 EP 2185808A1 EP 08774908 A EP08774908 A EP 08774908A EP 08774908 A EP08774908 A EP 08774908A EP 2185808 A1 EP2185808 A1 EP 2185808A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection valve
- fuel injection
- stop
- intermediate element
- actuator
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000008719 thickening Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 125000002066 L-histidyl group Chemical group [H]N1C([H])=NC(C([H])([H])[C@](C(=O)[*])([H])N([H])[H])=C1[H] 0.000 claims 1
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
-
- 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
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0024—Valves characterised by the valve actuating means electrical, e.g. using solenoid in combination with permanent magnet
-
- 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
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0043—Two-way valves
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
- F02M63/008—Hollow valve members, e.g. members internally guided
-
- 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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
-
- 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
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
Definitions
- the invention relates to a fuel injection valve for internal combustion engines, in particular a solenoid valve for common rail injectors (CRI), according to the preamble of claim 1.
- a fuel injection valve for internal combustion engines in particular a solenoid valve for common rail injectors (CRI), according to the preamble of claim 1.
- CRI common rail injectors
- European Patent Application EP 1 612 403 A1 discloses fuel injection valves for high-speed, self-igniting internal combustion engines, which inject the fuel directly into a combustion chamber of an internal combustion engine.
- the influence on the armature stroke is particularly large.
- These include those solenoid valves in which the upper stroke stop is formed on the magnet. Due to the rail pressure, the situation occurs that the valve seat changes its axial position relative to the holding body, whereas the position of the upper stroke stop remains unchanged. Overall, this means that the armature stroke decreases with increasing rail pressure.
- the prerequisite for the reliable operation of the solenoid valve is that the armature stroke is above a minimum value at all rail pressures, so that even at the highest rail pressure the armature stroke still achieves the minimum value. In the depressurized state, therefore, an armature stroke must be set which is significantly above the minimum value.
- An injection valve consists of a large number of individual parts which, when assembled, must interact very precisely. These include in particular the setting of the stroke of the actuating element, also called armature stroke, the setting of the valve spring force and finally also ensuring a minimum distance between the actuator and the actuator. (For a solenoid valve, this distance is called the residual air gap).
- the object of the invention is to show a fuel injection valve according to the preamble of claim 1, in particular a Mag ⁇ netventil, which is as simple as possible with respect to construction, adjustment and assembly and at the same time offers good adjustability of the valve parameters to be set.
- a way up ⁇ is intended in particular, in which the armature stroke even at high rail pressure changes little and remains in particular essentially unchanged.
- the object is achieved in a fuel injection valve according to the preamble of claim 1, characterized in that the
- ⁇ ment which is also commonly referred to as an anchor or as a sealing sleeve, has a central through hole, which ei ⁇ nen tapered portion comprises, in the a thickening of an intermediate element is arranged, wherein the of itself is by ⁇ diameter of the thickening is greater than the smallest diameter of the tapered portion of the central through hole of the positioning element, the intermediate element is a Anschlagele- - A -
- the central through hole is preferably designed as an inner bore, which is tapered in the upper region.
- the intermediate element is guided or inserted through the inner bore. Due to the thickening, a lower stop for the actuating element is formed on the intermediate element. In the lowest possible axial position of the actuating element relative to the intermediate element, a contact line is formed between these two elements.
- This is preferably designed as a sealing seat and is used in the assembled state of the valve to seal a pressure chamber.
- the stop element By the stop element, the axial play of the adjusting element between its usually designed as a sealing seat lower stop on the intermediate element and its upper stop is set. Said axial clearance, which is equal to the armature stroke of the switching valve, can thus be adjusted by the thickness of the stop element.
- An aspect of the invention is to be seen in the fact that the limitation of the upper stroke stop, so when the actuator is in the greatest possible proximity to the actuator, not by means of an element which is located directly between the actuator and the actuator, for example a Rest Kunststoffspaltsscale at a Magnetic valve. Rather, the stroke stop is realized by means of the intermediate element, which is supported on the actuator or on other parts of the injection valve. This results in an injection valve with a simple structure, which also allows easy assembly of the injector.
- Another aspect of the invention results from the above-mentioned fact that both the upper and the lower stroke stop of the adjusting element, which is also called anchor or sealing sleeve, formed on the intermediate element or provided or mounted and are only a short distance from each other.
- a preferred embodiment of the valve is characterized in that the stop element rests against the end face of the actuating element. This provides a simple way to define the upper stroke stop and to initiate the force that stops the stop element at the end of the defined path in the actuator. In particular, it is advantageous if the stop element mechanically blocks the movement of the actuating element, since this results in a reliable and easy-to-implement design.
- a further preferred embodiment of the valve is characterized in that the intermediate element has at least one first groove into which the stop element is inserted, wherein the stop element at least partially protrudes from the first groove.
- the stop element can be produced inexpensively and mechanically robust.
- the extension of the stop element in the longitudinal direction of the intermediate element is less than the distance between the bearing surface for the stop element on the actuating element and the upper end face of the first groove in the intermediate element, which results when the actuating element is at its lower stop located on the intermediate element. This results in a defined play of the stop element and thus also the adjusting element in the longitudinal direction relative to the intermediate element.
- the stop element is designed as a sickle disc.
- the intermediate element can be guided through an opening whose diameter is smaller than that of the sickle disk, and the sickle disk are then placed on it. This results in a greater konstrukti ⁇ ve freedom and easier assembly.
- a further preferred embodiment of the valve is characterized in that the fuel injection valve ei ⁇ ne valve spring for acting on the actuating element in the direction of the sealing seat, wherein the valve spring is supported on one side on the stop element and on another side of a holding portion, the intermediate element is trained.
- the valve spring is supported in a known manner on the actuating element.
- the embodiment proposed here offers the advantage that the stop element always has a fixed axial position with respect to the actuating element and consequently can not wobble during switching operations nor can it strike only selectively at first. In both cases, there is the advantage that the intermediate element can already be manufactured or assembled with adjusting element, stop element and holding region before it is inserted into the injection valve.
- a further preferred embodiment of the valve is characterized in that the holding area is a holding element has, which is inserted into a second groove formed on the intermediate element and at least partially protrudes from the second groove.
- This embodiment provides a structurally simple and cost-effective solution.
- the holding element is preferably designed as a sickle disc, with the same advantages as explained for the stop element.
- a further preferred embodiment of the valve is characterized in that the intermediate element has at its first end, which faces away from the actuating element, a drain groove, one or more obliquely running drain holes or a central, opening into a transverse bore drainage hole. In this way, the required outflow of fuel from the armature space to the return port can be realized.
- the stop element and / or the retaining element is secured in its seat in the respective groove by means of a fixing element.
- the fixing element in particular a fixing sleeve, preferably encloses the respective element and thus ensures that the respective element remains radially positioned and, in particular, can not escape from the groove provided in the intermediate element for the respective element.
- a further preferred embodiment of the valve is characterized in that the actuator is supported with an outer region on a holding body of the Kraftstoffeinspritzven- tils.
- the support preferably takes place via the outer pole. This creates between the upper end face of the guide element, also called anchor guide, and the lower end face of the intermediate element, also called seat pin, a fuel volume. If the intermediate element, actuator and stop element as well as If necessary, from the holding area and valve spring existing assembly is not already attached otherwise, it is, as soon as the rail pressure is applied, up to their desired position, preferably against a fixed to the holding body stop pressed.
- Another preferred exemplary embodiment of the valve is characterized in that a spring is arranged between the guide element and the intermediate element. This has the effect that the switching valve is in its setpoint position even in the pressureless state.
- a further preferred embodiment of the valve is characterized in that the intermediate element and the guide element are made in one piece. This allows a stable bond between the actuator, the intermediate element and the guide element. In particular, when the actuator and guide element on the same reference element, usually supported on the holding body of the injection valve, the composite is less sensitive to fluctuations in the rail pressure, which can otherwise lead to strains and / or shifts.
- Figure 1 shows a longitudinal section through a fuel injection valve according to the invention with schematically shown supply components
- Figure 2 is an enlargement of Figure 1 in the region of the control valve
- Figure 3 is an enlarged detail of Figure 2;
- FIG. 4 shows the control valve from FIG. 2 with a guide element and an actuator
- FIG. 5 shows an intermediate element from FIG. 4
- Figure 6 shows another embodiment of an intermediate element
- Figure 7 is a one-piece design of intermediate element and guide element.
- FIG. 1 shows a fuel injection valve 10 according to the invention with the fuel-supplying components 12 is shown schematically in longitudinal section.
- the basic mode of operation of such a fuel injection valve 10 is known to the person skilled in the art and will therefore not be explained in detail. More detailed information can be found for example in the cited document and in the application DE 10 2006 027 485 Al.
- the fuel injection valve 10 has a valve needle 14, a control chamber 16, which is operatively connected to the valve needle 14, a drain channel 18, which is designed to connect the control chamber 16 with a leakage oil chamber 20, and a control valve 22, which is used to open and close the drain channel 18 is formed.
- the control valve 22 has a guide element 24, also called guide pin on which an adjusting element 26, also called sealing sleeve or armature, is held axially displaceable, wherein the actuating element 26 is acted upon in the direction of a sealing seat 28 with a force.
- the control valve 22 further includes an actuator 29, here an electromagnet, which is adapted to lift the actuator 26 from the sealing seat 28 up-related to the figure.
- the actuator 29 is supported here with its outer region on projections 30 of the holding body 31.
- FIG. 2 shows an enlargement of FIG. 1 in the region of the control valve 22.
- an intermediate element 32 which forms the sealing seat 28 inter alia in cooperation with the adjusting element 26 .
- the grooves 34, 36 are here executed annularly along the entire circumference of the intermediate element 32.
- a stop element 38 is inserted, which protrudes from the first groove 34 and is designed here as a sickle disc.
- the stop element 38 is displaceable along a longitudinal direction L of the intermediate element 32 by a defined path, which will be shown in more detail below.
- the stop element 38 bears against an end face 40 of the actuating element 26 and interacts with it in such a way that an upper stroke stop (indicated by the line 42) of the actuating element 26 is predetermined.
- a valve spring 44 provides a biasing force that pushes the stop member 38, and upon application of the actuator 26, also the actuator 26, down-relative to the figure.
- the valve spring 44 is supported on its one side 46 on the stop element 38 and on its other side 48 on a holding portion 50 which is formed on the intermediate element 32.
- the holding portion 50 has the second groove 36 and a holding member 52 which is designed as a sickle disc.
- the stop element 38 is secured with a first fixing element 54 and the holding element 52 with a second fixing element 56 in the respective seat.
- the intermediate element 32 has a drainage groove 60 at its first end 58. On the first end 58, an optional adjustment disk 62 for the residual air gap is also shown. Furthermore, a dashed circle 62 is shown, which indicates a region of the control valve 22, which is shown enlarged in the following figure. As already seen in FIG. 1, the intermediate element 32 is not arranged to be displaceable upwardly relative to the actuator 29.
- Figure 3 illustrates the area enlarged, which was previously indicated by the circle 62. By means of two dashed parallel lines, the path d is shown, by which the spacer 38 in the first groove 34 can shift.
- the valve spring 44 presses the stop element 38 down-related to the figure. Since the end face 40 of the actuating element 26 bears against the stop element 38, the actuating element 26 is also pressed down against the sealing seat 28. If now the actuator 29 is actuated, the actuator 26 is pulled against the force of the valve spring 44 upwards. The stop element 38 now sets the path d back, since the magnetic attraction of the actuator 29 to the actuator 26 is greater than the force of the valve spring 44. After the stop element 38 has been pushed by the actuator 26 by the way d up, it hits the top End of the groove 34 and is mechanically blocked.
- the actuator 26 Since the end face 40 of the actuating element 26 bears against the stop element 38, Also, a further movement of the actuating element 26 is prevented. Thus, the actuator 26 has well defined the upper stroke stop 42 reached. If the actuator 29 is de-energized, eliminates the attraction of the actuator 26, and the valve spring 44 pushes the stop member 38 down and thus the actuator 26 against the sealing seat 28. Since in this way, the lower stroke stop on the sealing seat 28 is well defined, can be determined by the invention, the total stroke of the actuator 26.
- Figure 4 shows the control valve of Figure 2 with the guide member 24 and the actuator 29, which is designed as an electromagnet and a magnetic core 64 and a magnetic coil 66 has.
- the intermediate element 32 is seated on the guide element 24, wherein a spring 68, also called a position spring or contact spring, is arranged between the guide element 24 and the intermediate element 32.
- a spring 68 also called a position spring or contact spring
- Figures 5, 6 and 7 show embodiments of the intermediate element 32.
- Figure 5 shows the intermediate element 32 of Figure 2.
- Figure 6 shows an intermediate element 32 'with a central drain hole 70 which opens into a transverse bore 72.
- FIG. 7 shows an intermediate element 32 ", which is formed integrally with the guide element 24. The latter embodiment can be used in particular for the fact that the magnetic core 64 is supported via the intermediate element 32 "in the holding body.
Landscapes
- 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)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007037824A DE102007037824A1 (de) | 2007-08-10 | 2007-08-10 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| PCT/EP2008/058902 WO2009021785A1 (de) | 2007-08-10 | 2008-07-09 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2185808A1 true EP2185808A1 (de) | 2010-05-19 |
| EP2185808B1 EP2185808B1 (de) | 2012-01-25 |
Family
ID=39797944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08774908A Not-in-force EP2185808B1 (de) | 2007-08-10 | 2008-07-09 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2185808B1 (de) |
| AT (1) | ATE542995T1 (de) |
| DE (1) | DE102007037824A1 (de) |
| WO (1) | WO2009021785A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009046563A1 (de) * | 2009-11-10 | 2011-05-12 | Robert Bosch Gmbh | Kraftstoffinjektor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10100422A1 (de) * | 2001-01-08 | 2002-07-11 | Bosch Gmbh Robert | Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
| EP1612403B1 (de) | 2004-06-30 | 2007-01-10 | C.R.F. Società Consortile per Azioni | Servoventil zum Steuern eines Einspritzventils einer Brennkraftmaschine |
| DE102004050992A1 (de) * | 2004-10-20 | 2006-04-27 | Robert Bosch Gmbh | Magnetventilbetätigter Kraftstoffinjektor mit hydraulischem Überhubanschlag |
| DE102006027485A1 (de) | 2006-06-14 | 2007-12-20 | Robert Bosch Gmbh | Kraftstoffeinspritzventil mit Sicherheitssteuerventil |
-
2007
- 2007-08-10 DE DE102007037824A patent/DE102007037824A1/de not_active Withdrawn
-
2008
- 2008-07-09 AT AT08774908T patent/ATE542995T1/de active
- 2008-07-09 EP EP08774908A patent/EP2185808B1/de not_active Not-in-force
- 2008-07-09 WO PCT/EP2008/058902 patent/WO2009021785A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009021785A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2185808B1 (de) | 2012-01-25 |
| DE102007037824A1 (de) | 2009-02-12 |
| WO2009021785A1 (de) | 2009-02-19 |
| ATE542995T1 (de) | 2012-02-15 |
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