WO2001018381A1 - Gebautes steuerventil für einen injektor eines kraftstoffeinspritzsystems für brennkraftmaschinen - Google Patents
Gebautes steuerventil für einen injektor eines kraftstoffeinspritzsystems für brennkraftmaschinen Download PDFInfo
- Publication number
- WO2001018381A1 WO2001018381A1 PCT/DE2000/002824 DE0002824W WO0118381A1 WO 2001018381 A1 WO2001018381 A1 WO 2001018381A1 DE 0002824 W DE0002824 W DE 0002824W WO 0118381 A1 WO0118381 A1 WO 0118381A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control valve
- sleeve
- control
- valve according
- sealing
- Prior art date
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
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
-
- 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
Definitions
- the invention relates to a control valve for an injector of a fuel injection system for internal combustion engines with an annular space radially delimited by a collar of a control piston and a bore of a housing, which has a first annular groove and a second annular groove at its ends, the control piston being coaxial with the bore in at least one extending first guide bore is axially displaceable and wherein the control piston has means for sealing the annular space from the first annular groove and means for sealing the annular space from the second annular groove.
- Such control valves are known as a seat-seat valve with a two-part housing or as a seat-seat valve with a one-part housing and two valve bodies.
- a disadvantage of the first known design is the comparatively large production outlay and the complex sealing of the two-part housing from the surroundings.
- both valve bodies must be actuated in order to achieve a corresponding switching of the control valve.
- the invention is based on the task of a simply constructed control valve for an injector To provide fuel injection system.
- a control valve for an injector of a fuel injection system for internal combustion engines with an annular space which is radially delimited by a collar of a control piston and a bore in a housing and which has a first annular groove and a second annular groove at its ends, the control piston in at least one is guided axially displaceable coaxially to the bore and wherein the control piston has means for sealing the annular space from the first annular groove and means for sealing the annular space from the second annular groove, and wherein the means for sealing the annular space from the second annular groove are detachable with the control piston are connected.
- the control valve according to the invention has the advantage that it is simple to manufacture and also easy to assemble, since the means for sealing the annular space are releasably connected to the control piston from the second annular groove.
- a variant provides that the means for sealing the annular space from the second annular groove and / or the means for sealing the annular space from the first annular groove are frustoconical sealing cones arranged coaxially to the longitudinal axis of the control piston, so that a good sealing effect is achieved over the entire service life of the control valve is achieved.
- the means for sealing the annular space from the second annular groove are part of a sleeve arranged coaxially to the longitudinal axis of the control piston, so that the means for sealing the annular space from the second annular groove are easy to assemble.
- the face of the sleeve facing the control piston is flat and that the face of the control piston facing the sleeve is flat, so that the sleeve is not centered by the control piston and the sealing cone of the sleeve is optimally positioned on the sealing surface in the housing is applied.
- the end face of the sleeve facing the control piston and the end face of the control piston facing the sleeve are frustoconical, so that the sleeve is centered by the control piston and is thus additionally guided via the guide of the control piston in the housing.
- the sleeve is axially displaceably guided in a second guide bore of the housing which runs coaxially to the bore, so that any misalignment of the control piston does not have a negative effect.
- Another embodiment provides that the sleeve is connected to the control piston by means of a pin projecting axially beyond the collar of the control piston with an external thread and a nut, so that a simple and resilient connection of the sleeve and control piston is achieved.
- the sleeve is connected to the control piston by means of a pin projecting in the axial direction beyond the collar of the control piston, so that quicker assembly is made possible and unintentional loosening of the connection between the control piston and sleeve is avoided ,
- the sleeve is connected to the control piston by means of a screw turned into an internal thread of the control piston, so that the overall length of the control piston and the number of components are reduced.
- a plate spring or a spring washer is arranged between the sleeve and the nut or the circlip or the screw, so that the preload with which the sleeve is pressed against the end face of the control piston can be easily adjusted.
- One variant provides that there is an axial play, in particular from 10 ⁇ m to 20 ⁇ m, between the sleeve and the pin or the screw, so that the sleeve can align better relative to the housing.
- sealing surfaces are formed between the bore and the annular grooves, which cooperate with the means for sealing the annular space from the second annular groove and / or the means for sealing the annular space from the first groove, so that between the bore and the annular grooves sealing surfaces are formed which with the means for sealing the annular space from the second annular groove and / or the means for
- the annular space is connected to the valve control chamber of the injector, the first annular groove is connected to the inlet channel of the injector and the second annular groove is connected to the fuel return of the injector, so that the leakage losses are minimized.
- the housing is made in one piece, so that its manufacture is simplified and its tightness is improved.
- control valve to be operated as a 3/2-control valve or a 3/3-control valve, so that the advantages of the control valve according to the invention can be used in both circuit variants.
- the injection system is a common rail injection system, so that the advantages of the control valve according to the invention also benefit these injection systems.
- FIG. 3 shows a second embodiment of a control valve according to the invention in section
- Fig. 4 a detail of the connection of the control piston and
- FIG. 1 An injector is shown in FIG. Via a high-pressure connection 1, fuel 3 is fed via an inlet channel 5 to an injection nozzle 7 and via a
- Valve control chamber 11 is connected to a fuel return 17 via a drain channel 12 and an outlet throttle 13, which can be opened by a control valve 15.
- the fuel 3 is shown in FIG. 1 as a black area.
- the valve control chamber 11 is delimited by a valve piston 19.
- a nozzle needle 21 Connected to the valve piston 19 is a nozzle needle 21, which prevents the fuel 3 under pressure from flowing between the injections into the combustion chamber (not shown).
- the nozzle needle 21 has a cross-sectional change 23 from a larger diameter 25 to a smaller diameter 27. With its larger diameter 25, the nozzle needle 21 is guided in a housing 29.
- the cross-sectional change 23 delimits a pressure space 31 of the injection nozzle 7
- a nozzle spring 39 acting on a shoulder 37 of the nozzle needle 21 closes the injection nozzle 7 or the injector.
- control and leakage quantities can be up to 50 mm 3 / stroke. They are returned to the fuel tank (not shown) via the fuel return 17. Between the injections, the flow restrictor 13 is closed by the control valve 15.
- a bore 41 is provided in the housing 29.
- a first guide bore 43 and a second guide bore 45 are provided coaxially with the bore 41.
- a control piston 47 is guided in the first guide bore 43.
- the control piston 47 has a collar 49, the diameter of which is smaller than the diameter of the bore 41
- first annular groove 50 and a second annular groove 51 End a first annular groove 50 and a second annular groove 51.
- the bore 41 has a smaller diameter than the first guide bore 43 and the second guide bore 45. Since the control piston 47 is guided at least in the first guide bore 43, its diameter 53 is in the section which is in the first guide bore 43 is larger than that of the collar 49. The transition between the collar 49 and the larger diameter 53 is formed by a truncated cone designed as a sealing cone 55. Between the bore 41 and the first annular groove 50, a first sealing seat 59 is formed in the housing 29, which with the
- Sealing cone 55 can hydraulically separate the annular space formed by collar 49 and bore 41 from first annular groove 50.
- a sleeve 61 is guided with a central bore, which is screwed to the control piston 47 via a pin 63 with thread and a nut 65.
- the sleeve 61 has a sealing cone 67 at its end facing the collar 49.
- the sealing cone 67 together with a second sealing seat 69 arranged between the bore 41 and the second annular groove 51, can separate the annular space from the second annular groove 51.
- the end face of the collar 49 and a corresponding end face 71 of the sleeve 61 are flat, so that when the sleeve 61 and the control piston 47 are screwed together, the sleeve 61 is not centered by the control piston 47. This is explained by the fact that there is play between the pin 63 and the center bore of the sleeve 61.
- first annular groove is connected to the inlet channel 5
- second annular groove 51 is connected to the fuel return 17
- annular space between the collar 49 and the bore 41 is connected to the outlet channel 12 and the valve control chamber 11 is hydraulically connected.
- the control valve is actuated by an actuator, not shown, which acts on the control piston 47.
- the actuator can be, for example, a piezo actuator or a solenoid valve.
- the control valve according to the invention can be used as a 3/2-control valve or as a 3/3-control valve. If it is used as a 3/2 control valve either the first annular groove 50 or the second annular groove 51 is hydraulically separated from the annular space. Otherwise, the control piston 47 can also take an intermediate position in which the three connections of the control valve are hydraulically connected. This switch position can be advantageous if rapid opening of the nozzle needle 21 is desired during the main injection.
- FIG. 3 shows a further embodiment of a control valve 15 according to the invention.
- the same components have been given the same reference numbers and will not be explained further.
- a disc spring 70 is arranged between the nut 65 and the sleeve 61, which facilitates the setting of a defined contact force between the sleeve 61 and the end face of the collar 49.
- the end face of the collar 49 is frustoconical.
- the end face 71 of the sleeve 61 is also frustoconical.
- the sleeve 61 is centered by the control piston 47. This can be advantageous if the coaxiality of the first guide bore 43, second guide bore 45, first sealing seat 59 and second sealing seat 69 of the housing 29 can be produced with the required precision
- FIG. 4 shows a detail from a connection of control pistons 47 and sleeve 61.
- a groove 75 is inserted in the pin 63 of the control piston 47, in which a ring 77 is mounted.
- a plate spring 70 and a washer 79 are arranged between the end of the sleeve 61 and the circlip 77.
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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00967528A EP1129284A1 (de) | 1999-09-02 | 2000-08-18 | Gebautes steuerventil für einen injektor eines kraftstoffeinspritzsystems für brennkraftmaschinen |
JP2001521888A JP2003508680A (ja) | 1999-09-02 | 2000-08-18 | 内燃機関のための燃料噴射システムのインゼクタのための組付けられる制御弁 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19941709.1 | 1999-09-02 | ||
DE1999141709 DE19941709A1 (de) | 1999-09-02 | 1999-09-02 | Gebautes Steuerventil für einen Injektor eines Kraftstoffeinspritzsystems für Brennkraftmaschinen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001018381A1 true WO2001018381A1 (de) | 2001-03-15 |
Family
ID=7920474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/002824 WO2001018381A1 (de) | 1999-09-02 | 2000-08-18 | Gebautes steuerventil für einen injektor eines kraftstoffeinspritzsystems für brennkraftmaschinen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1129284A1 (de) |
JP (1) | JP2003508680A (de) |
DE (1) | DE19941709A1 (de) |
WO (1) | WO2001018381A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078825A1 (de) * | 2002-03-20 | 2003-09-25 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung mit 3/2-wege-ventil |
CN102597488A (zh) * | 2009-11-10 | 2012-07-18 | 罗伯特·博世有限公司 | 燃料喷射器 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10046823B4 (de) * | 2000-09-20 | 2004-07-15 | L'orange Gmbh | Servosteuerventil für Einspritzinjektoren |
DE10113028A1 (de) * | 2001-03-17 | 2002-09-26 | Bosch Gmbh Robert | 3/2-Wegeventil |
DE10252547B4 (de) * | 2002-11-08 | 2014-12-24 | Robert Bosch Gmbh | Druckausgeglichenes, direktgesteuertes Ventil |
US7243902B2 (en) | 2002-11-08 | 2007-07-17 | Robert Bosch Gmbh | Pressure-compensated, directly controlled valve |
EP1694957A1 (de) * | 2003-11-11 | 2006-08-30 | Robert Bosch GmbH | Druckausgeglichenes, direktgesteuertes ventil |
DE102011004640A1 (de) | 2011-02-24 | 2012-08-30 | Robert Bosch Gmbh | Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0686764A2 (de) * | 1994-06-07 | 1995-12-13 | Lucas Industries Public Limited Company | Brennstoffzufuhrsystem |
EP0728969A1 (de) * | 1995-02-21 | 1996-08-28 | Lucas Industries Public Limited Company | Ventil |
DE19512730C1 (de) * | 1995-04-05 | 1996-08-29 | Mtu Friedrichshafen Gmbh | Kraftstoffeinspritzanlage für Brennkraftmaschine |
US5722373A (en) * | 1993-02-26 | 1998-03-03 | Paul; Marius A. | Fuel injector system with feed-back control |
US5826561A (en) * | 1996-12-10 | 1998-10-27 | Caterpillar Inc. | Method and apparatus for injecting fuel using control fluid to control the injection's pressure and time |
-
1999
- 1999-09-02 DE DE1999141709 patent/DE19941709A1/de not_active Ceased
-
2000
- 2000-08-18 EP EP00967528A patent/EP1129284A1/de not_active Withdrawn
- 2000-08-18 WO PCT/DE2000/002824 patent/WO2001018381A1/de not_active Application Discontinuation
- 2000-08-18 JP JP2001521888A patent/JP2003508680A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5722373A (en) * | 1993-02-26 | 1998-03-03 | Paul; Marius A. | Fuel injector system with feed-back control |
EP0686764A2 (de) * | 1994-06-07 | 1995-12-13 | Lucas Industries Public Limited Company | Brennstoffzufuhrsystem |
EP0728969A1 (de) * | 1995-02-21 | 1996-08-28 | Lucas Industries Public Limited Company | Ventil |
DE19512730C1 (de) * | 1995-04-05 | 1996-08-29 | Mtu Friedrichshafen Gmbh | Kraftstoffeinspritzanlage für Brennkraftmaschine |
US5826561A (en) * | 1996-12-10 | 1998-10-27 | Caterpillar Inc. | Method and apparatus for injecting fuel using control fluid to control the injection's pressure and time |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078825A1 (de) * | 2002-03-20 | 2003-09-25 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung mit 3/2-wege-ventil |
CN102597488A (zh) * | 2009-11-10 | 2012-07-18 | 罗伯特·博世有限公司 | 燃料喷射器 |
US20120216772A1 (en) * | 2009-11-10 | 2012-08-30 | Robert Bosch Gmbh | Fuel injector |
Also Published As
Publication number | Publication date |
---|---|
DE19941709A1 (de) | 2001-03-15 |
JP2003508680A (ja) | 2003-03-04 |
EP1129284A1 (de) | 2001-09-05 |
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