EP1045977A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1045977A1 EP1045977A1 EP99938137A EP99938137A EP1045977A1 EP 1045977 A1 EP1045977 A1 EP 1045977A1 EP 99938137 A EP99938137 A EP 99938137A EP 99938137 A EP99938137 A EP 99938137A EP 1045977 A1 EP1045977 A1 EP 1045977A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- valve
- valve member
- fuel injection
- chamber
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007921 spray Substances 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating 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
- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
Definitions
- the invention relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1.
- Such an injection valve can be seen, for example, from DE 43 25 904 C2 and from unpublished DE 197 16 226.6-13.
- the fuel injection valve according to the invention with the features of claim 1 has the advantage that the guidance and sealing is improved compared to the fuel injection valves for internal combustion engines known from the prior art.
- the arrangement of the one pressure shoulder at the end of the valve body remote from the combustion chamber in a compensation chamber fluidically connected to the pressure chamber, which is closed at the end by an axially displaceably guided pressure sleeve, has the particularly great advantage that the compensation chamber is always connected to the pressure chamber. This ensures that the pressure shoulder is always pressurized, on the other hand it is ensured that pressure differences between the pressure chamber and the compensation chamber, for example when the fuel injection valve is opened, are compensated for directly. In this way, there is always a return to the closed position of the fuel injection valve even if, for example, a force acting in the opening direction acts on the valve member due to a leak on the combustion chamber side due to a pressure difference between the pressure shoulders caused thereby.
- valve member between the two pressure shoulders is advantageously needle-shaped and has a constant diameter.
- This design of the valve member between the two pressure shoulders as a thin needle with a constant diameter means that a slight offset between the guides, which is caused on the one hand by the valve member head and on the other hand by the pressure sleeve are formed, be balanced in a simple and advantageous manner.
- the pressure sleeve is preferably pressed onto the valve member in order to avoid leakages.
- the compensation space can be designed in any way.
- An embodiment which is advantageous in particular with regard to simple manufacture provides that the compensation space surrounds the pressure shoulder remote from the combustion chamber in a ring shape.
- the high-pressure fuel supply to the fuel injection valve is preferably carried out from a high-pressure storage space common to all the fuel-injection valves, which in turn can be filled via a high-pressure fuel pump.
- the actuator for actuating the valve member is advantageously an electromechanical actuator. It is designed in particular as a piezo actuator or electromagnet.
- FIG. 1 shows a schematic section through the lower region of a fuel injection valve for internal combustion engines making use of the invention. seem and
- FIG. 2 shows, schematically, an enlarged representation of the end of the valve body of the fuel injection valve for internal combustion engines shown in FIG. 1, remote from the combustion chamber.
- An embodiment of a fuel injector for internal combustion engines has a valve body 10 which is axially clamped to a valve holding body 20 by means of a union nut 30.
- the valve body 10 has an axial guide bore 40, in which a needle-shaped valve member 50 is axially displaceably guided, which has a valve head 52 acting as a valve closing member at its lower end, which projects into a combustion chamber (not shown) of the internal combustion engine to be supplied with fuel.
- This valve head 52 protruding from the bore has a conical sealing surface 53 facing the valve body 10, which in the exemplary embodiment shown is formed by a seat ring placed on the valve head 52 and which cooperates with a corresponding valve seat surface 11 on the end face of the valve body 10 on the combustion chamber side.
- a pressure chamber 12 is formed in the valve body 10, each axially from one on the Valve member 50 trained pressure shoulder 54 and 55 is limited.
- An inlet bore 60 opens into this pressure chamber 12 in a volume of the pressure chamber 12 enlarged as the pressure chamber 13 in a manner known per se.
- the pressure shoulder 55 arranged at the end of the pressure chamber 12 remote from the combustion chamber has the same pressure application surface as the pressure shoulder 54 formed on the valve member head 52 so that the valve member 50 is pressure balanced. This prevents the fuel injector from opening automatically due to the common rail pressure present.
- the fuel injection valve has a further additional contact surface acted upon by the high fuel pressure, via which the high fuel pressure applied to the injection valve acts on the valve member 50 in the closing direction.
- This additional pressure application surface is formed by a lower end surface 71 on the combustion chamber side of a pressure sleeve 70, which closes a compensation space 80, which surrounds the pressure shoulder 55 remote from the combustion chamber and is fluidly connected to the pressure chamber 12, on its side facing away from the combustion chamber.
- the compensation chamber 80 thus forms the end of the pressure chamber 12 remote from the combustion chamber.
- the sleeve 70 is guided axially displaceably in an annular body 90. It is pressed onto the upper shaft part 56 of the valve member 50 in order to avoid leakages.
- the fuel injector is also reset to the closed position if, for example, the high stress on the fuel injector in the region of the valve member head 52 has caused a slight leak which leads to an undesired opening of the fuel injector.
- valve part 57 adjoins the valve member shaft 56, which projects into a spring chamber 22 provided in the valve holding body 20.
- an electromechanical actuator for example a piezo actuator or an electromagnet, causes an axial displacement of the valve member 50 and thus an opening of the injection opening (not shown) provided in the valve member head 52.
- the area between the two pressure shoulders 54 and 55 of the valve member 50 is needle-shaped with a constant diameter.
- the resulting elasticity of the valve member 50, in particular perpendicular to the valve member axis, advantageously enables the compensation of an offset between the guides of the valve member 50, which are formed by the pressure sleeve 70 and the valve member head 52, in the central region of the needle-shaped region.
- the direct connection of the compensation chamber via the inlet 12a to the pressure chamber 12 causes pressure differences, for example when the fuel inlet is opened.
- Spray valve between the pressure chamber 12 and the compensation chamber 80 compensated directly.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19837813 | 1998-08-20 | ||
DE19837813A DE19837813A1 (de) | 1998-08-20 | 1998-08-20 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
PCT/DE1999/001660 WO2000011341A1 (de) | 1998-08-20 | 1999-06-08 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1045977A1 true EP1045977A1 (de) | 2000-10-25 |
EP1045977B1 EP1045977B1 (de) | 2003-09-03 |
Family
ID=7878158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99938137A Expired - Lifetime EP1045977B1 (de) | 1998-08-20 | 1999-06-08 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6247453B1 (de) |
EP (1) | EP1045977B1 (de) |
JP (1) | JP2002523672A (de) |
DE (2) | DE19837813A1 (de) |
WO (1) | WO2000011341A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19953562A1 (de) * | 1999-11-08 | 2001-05-23 | Bosch Gmbh Robert | Kraftstoff-Einspritzdüse |
US6343587B1 (en) * | 2000-06-28 | 2002-02-05 | Siemens Automotive Corporation | Fuel injector armature permitting fluid and vapor flow |
DE10204655A1 (de) * | 2002-02-05 | 2003-08-28 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
EP1561942B1 (de) * | 2004-01-29 | 2006-12-27 | Siemens VDO Automotive S.p.A. | Flüssigkeitseinspritzventil und sein Herstellungverfahren |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3734737A1 (de) * | 1986-10-14 | 1988-04-21 | Orbital Eng Pty | Brennstoffeinspritzsystem und mit diesem ausgeruestete verbrennungsmaschine |
GB2219627B (en) * | 1988-06-10 | 1992-10-28 | Orbital Eng Pty | Improvements relating to nozzles for in-cylinder fuel injection systems |
US5024385A (en) * | 1990-01-11 | 1991-06-18 | Outboard Marine Corporation | Internal combustion engine fuel supply system |
DE4325904C2 (de) * | 1993-08-02 | 1995-07-20 | Daimler Benz Ag | Für eine Dieselbrennkraftmaschine vorgesehene Kraftstoffeinspritzanlage mit einer den Kraftstoff fördernden Hochdruckpumpe in eine gemeinsame Versorgungsleitung (Common-Rail) für alle Einspritzdüsen |
DE19504849A1 (de) * | 1995-02-15 | 1996-08-22 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
US5752656A (en) * | 1996-07-10 | 1998-05-19 | Outboard Marine Corporation | Nozzle assembly and method of fabrication thereof |
DE19642440A1 (de) * | 1996-10-15 | 1998-04-16 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19701288C2 (de) * | 1997-01-16 | 1999-10-14 | Daimler Benz Ag | Ventil zur dosierten Abgabe von Fluiden |
-
1998
- 1998-08-20 DE DE19837813A patent/DE19837813A1/de not_active Withdrawn
-
1999
- 1999-06-08 EP EP99938137A patent/EP1045977B1/de not_active Expired - Lifetime
- 1999-06-08 US US09/529,324 patent/US6247453B1/en not_active Expired - Fee Related
- 1999-06-08 DE DE59906859T patent/DE59906859D1/de not_active Expired - Fee Related
- 1999-06-08 WO PCT/DE1999/001660 patent/WO2000011341A1/de active IP Right Grant
- 1999-06-08 JP JP2000566568A patent/JP2002523672A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0011341A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1045977B1 (de) | 2003-09-03 |
US6247453B1 (en) | 2001-06-19 |
JP2002523672A (ja) | 2002-07-30 |
WO2000011341A1 (de) | 2000-03-02 |
DE19837813A1 (de) | 2000-02-24 |
DE59906859D1 (de) | 2003-10-09 |
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