EP1319128A1 - Fuel injection valve for internal combustion engines - Google Patents
Fuel injection valve for internal combustion enginesInfo
- Publication number
- EP1319128A1 EP1319128A1 EP01957756A EP01957756A EP1319128A1 EP 1319128 A1 EP1319128 A1 EP 1319128A1 EP 01957756 A EP01957756 A EP 01957756A EP 01957756 A EP01957756 A EP 01957756A EP 1319128 A1 EP1319128 A1 EP 1319128A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- holding body
- valve body
- pressure
- fuel injection
- 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 33
- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
-
- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
Definitions
- the invention is based on a fuel injection valve for internal combustion engines, preferably self-igniting internal combustion engines, according to the preamble of claim 1.
- a fuel injection valve known from German utility model 298 14 934
- a bore is formed in a valve body, in which a piston-shaped valve member is arranged to be longitudinally displaceable, the valve member controlling the opening of at least one injection opening by its longitudinal movement.
- the valve member is acted upon by a closing force in the closing direction and has a pressure surface which is arranged in a pressure chamber which can be filled with high-pressure fuel.
- a hydraulic force can be exerted on the pressure surface, which counteracts the closing force and thus causes the valve member to open and move.
- the device for generating the closing force is formed in a valve holding body which has a longitudinal axis and is braced in the axial direction against the valve body.
- There is a high-pressure connection on the valve holding body which opens into an inlet channel, which connects the valve holding body in longitudinal traverses direction and extends through the contact surface between the valve body and valve holding body into the pressure chamber of the valve body.
- the contact surface is thus a high-pressure sealing surface and must have a correspondingly good seal.
- the valve holding body is braced against the valve body by means of a clamping nut which encompasses the valve body and bears against an annular disk-shaped bearing surface which is remote from the valve holding body and is formed on the valve body.
- An external thread is attached to the valve holding body, into which the clamping nut engages with a corresponding internal thread, so that the valve body is braced against the valve holding body by screwing the clamping nut.
- a good seal is achieved on the high-pressure sealing surface between the valve holding body and the valve body, and the inlet channel, which passes through the high-pressure sealing surface, that is to say the contact surface of the valve holding body on the valve body, receives a secure seal.
- the thread which is formed on the outer surface of the valve holding body and into which the clamping nut engages, is designed as a fine thread.
- the flanks of the threads here enclose an angle of approximately 60 ° with the longitudinal axis of the thread and thus also with the longitudinal axis of the valve holding body.
- the axial bracing of the clamping nut thus provides, in addition to the force component acting on the screw surfaces in the axial direction, a force component acting in the radial direction with respect to the longitudinal axis of the valve holding body and expanding the clamping nut.
- the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the contact flanks of the external thread formed on the valve holding body and the internal thread formed on the clamping nut are at least approximately perpendicular to the longitudinal axis of the valve holding body, so that when the valve body is tensioned Clamping nut these contact flanks are pressed together without significant radial forces on the clamping nut.
- greater axial clamping forces can be exerted on the valve body or the valve holding body and a higher surface pressure on the high-pressure sealing surface between the two bodies can be achieved.
- An expansion of the clamping nut by radial force components therefore no longer takes place. This is particularly advantageous in the case of fuel injection valves which operate with a so-called common rail system, since the fuel body in the valve body is constantly high.
- FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention
- FIG. 2 shows an enlarged view of FIG. 1 in the area of the external thread of the valve holding body
- FIG. 3 shows a further exemplary embodiment of a fuel injection valve according to the invention in longitudinal section. Description of the embodiment
- a fuel injector according to the invention is shown in longitudinal section.
- a valve holding body 1 is braced against a valve body 3 in the axial direction.
- the valve body 3 is stepped in diameter and tapers towards the combustion chamber, so that an annular disk-shaped contact surface 24 is formed on its outer surface, which faces the combustion chamber.
- the valve body 3 is encompassed by a clamping nut 5, which rests on the contact surface 24 and extends over the valve holding body 1.
- An internal thread 44 is formed on the inner lateral surface of the clamping nut 5 at the level of the valve holding body 1 and engages in an external thread 42 formed on the outer lateral surface of the valve holding body 1, the external thread 42 having a longitudinal axis 8.
- a bore 7 is formed in the valve body 3, which starts from the end of the valve body 3 facing away from the combustion chamber and merges into a valve seat 20 at its end on the combustion chamber side.
- the valve seat 20 is essentially conical and has at least one injection opening 22, via which the bore 7 is connected to the combustion chamber of the internal combustion engine.
- a piston-shaped valve member 10 Arranged in the bore 7 is a piston-shaped valve member 10, which is located in a section facing away from the combustion chamber
- a pressure chamber 14 is formed in the valve body 3 at the level of the pressure shoulder 16 by a radial widening of the bore 7 and continues as an annular channel surrounding the valve member 10 up to the valve seat 20.
- An inlet channel 12 formed in the valve body 3 and in the valve holding body 1 opens into the pressure chamber 14 and is connected at its other end to a high-pressure fuel source, not shown in the drawing. Via this inlet channel 12, the pressure chamber 14 can be filled with fuel under high pressure.
- a spring chamber 32 designed as a bore is formed in the valve holding body 1, in which a guide piece 40 is arranged, which is connected to the end face of the valve member 10 facing away from the combustion chamber.
- the guide piece 40 is in this case cylindrical and is guided in the spring chamber 32.
- the guide piece 40 has at least one lateral recess 41 which connects the bore 7 with the spring chamber 32.
- a closing spring 34 designed as a helical compression spring is arranged under pressure prestress. This closing spring 34 surrounds a plunger 36, which is arranged in a guide bore 38 opening into the spring chamber 32 and rests on the guide piece 40 with its end face facing the valve member 10.
- a controllable closing force acts on the end face of the plunger 36 facing away from the combustion chamber by a device which is not shown in the drawing and which can apply a force to the plunger 36 in the direction of the valve seat 20.
- a predetermined high-pressure fuel In the closed state of the fuel injection valve, that is, when the valve sealing surface 18 bears against the valve seat 20, there prevails in the Pressure space 14 through the connection to the high-pressure fuel source, a predetermined high-pressure fuel.
- This high fuel pressure results in a hydraulic force on the pressure shoulder 16, so that an opening force acts on the pressure shoulder 16 in the direction away from the valve seat 20.
- the closing force on the tappet 36 which also acts on the valve member 10 via the guide piece 40, outweighs this opening force, so that the valve member 10 remains in the closed position.
- the closing spring 34 acts as a support. If fuel is to be injected, then the
- Closing force on the plunger 36 is reduced and the hydraulic force on the pressure shoulder 16 is now able to move the valve member 10 against the closing force on the plunger 36 and the spring force of the closing spring 34 in the opening direction, ie. H. away from the valve seat 20.
- the valve sealing surface 18 lifts off the valve seat 20, the injection openings 22 are opened and fuel flows from the pressure chamber 14 through the injection openings 22 into the combustion chamber of the internal combustion engine.
- fuel is constantly fed from the high-pressure fuel source via the inlet channel 12 under high pressure.
- the end of the injection is in turn brought about by increasing the closing force on the tappet 36, so that the valve member 10 moves back into the closed position due to the previously described force relationships.
- FIG. 2 shows an enlargement in the area where the clamping nut 5 and valve holding body 1 overlap.
- the external thread 42 on the valve holding body 1 has an inclined flank 46 in each thread, which includes an angle ⁇ with the longitudinal axis 8 of the external thread 42.
- the system flank 52 opposite the inclined flank 46 forms an angle ⁇ with the longitudinal axis 8 of the external thread 42, which angle at least approximately 90 °.
- the internal thread 44 of the clamping nut 5 is designed accordingly to engage in the external thread 42 of the valve holding body 1.
- Each thread of the internal thread 44 has an inclined flank 48 which, when the clamping nut 5 is screwed in, lies opposite the inclined flank 46 of the external thread 42.
- the two inclined flanks 46, 48 are generally not pressed against one another, since the clamping nut 5 is braced against the valve holding body 1 in the axial direction.
- the flank of the internal thread 44 opposite the inclined flank 48 is designed as a contact flank 50 and is at least approximately perpendicular to the longitudinal axis 8 of the valve holding body 1.
- the contact flank 50 rests on the contact flank 52 of the external thread 42, so that when the clamping nut 5 is screwed tightly one in the axial direction
- Directional force is transmitted from the clamping nut 5 via the outer contact flank 50 to the contact flank 52 of the external thread 42 of the valve holding body 1.
- FIG. 3 as an alternative to the structure shown in FIG. 1, a fuel injection valve is shown in longitudinal section, in which a valve injection body 1 and the valve body 3 have one Intermediate disc 6 is arranged so that two high-pressure sealing surfaces are formed: first at the transition from valve holding body 1 to intermediate disc 6 and from intermediate disc 6 to valve body 3.
- the thread according to the invention on the inside of the clamping nut 5 or on the outer lateral surface of the valve holding body 1, an optimized surface pressure and thus an improved tightness at the transition of the inlet channel 12 through the high-pressure sealing flats.
- the clamping nut engages with its internal thread in an external thread arranged on the outer surface of the valve body 3.
- the clamping nut is supported on a contact surface formed on the valve holding body 1, which faces away from the valve body 1, so that in this case too, the valve body 3 and the valve holding body 1 can be braced against one another.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10044933A DE10044933A1 (en) | 2000-09-12 | 2000-09-12 | Fuel injection valve for internal combustion engines |
DE10044933 | 2000-09-12 | ||
PCT/DE2001/002986 WO2002023037A1 (en) | 2000-09-12 | 2001-08-04 | Fuel injection valve for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1319128A1 true EP1319128A1 (en) | 2003-06-18 |
EP1319128B1 EP1319128B1 (en) | 2006-11-29 |
Family
ID=7655844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01957756A Expired - Lifetime EP1319128B1 (en) | 2000-09-12 | 2001-08-04 | Fuel injection valve for internal combustion engines |
Country Status (5)
Country | Link |
---|---|
US (1) | US6712295B2 (en) |
EP (1) | EP1319128B1 (en) |
JP (1) | JP2004509268A (en) |
DE (2) | DE10044933A1 (en) |
WO (1) | WO2002023037A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10125439A1 (en) * | 2001-05-25 | 2002-11-28 | Bosch Gmbh Robert | High pressure connecting device comprises two breech block threads having thread flanks formed perpendicular to the longitudinal axis of the internal thread and lying against each other in a force-locking manner |
DE112004002581D2 (en) * | 2004-01-12 | 2006-11-23 | Siemens Ag | Method for tightening a nozzle retaining nut of an injector for fuel injection and injector and nozzle lock nut |
DE102011076957A1 (en) * | 2011-06-06 | 2012-12-06 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
DE102011089247A1 (en) * | 2011-12-20 | 2013-06-20 | Robert Bosch Gmbh | Fuel injector |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4616537A (en) * | 1983-04-04 | 1986-10-14 | Awb, Inc. | Pipe connection |
GB2139697A (en) * | 1983-05-13 | 1984-11-14 | Lucas Ind Plc | Compression ignition engine fuel injection nozzles |
DE3675227D1 (en) * | 1985-02-15 | 1990-12-06 | George Seabrook Wing | THREAD TYPE AND FASTENING SYSTEM WHICH THE THREAD TYPE IS USED. |
WO1989002807A1 (en) | 1987-09-29 | 1989-04-06 | John Wentworth Bucknell | Force applicators |
DE19508636A1 (en) * | 1995-03-10 | 1996-09-12 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
IT1276503B1 (en) * | 1995-07-14 | 1997-10-31 | Elasis Sistema Ricerca Fiat | IMPROVEMENTS TO AN ELECTROMAGNETICALLY OPERATED DOSING VALVE, FOR A FUEL INJECTOR. |
IT1289795B1 (en) * | 1996-12-23 | 1998-10-16 | Elasis Sistema Ricerca Fiat | IMPROVEMENTS TO AN ELECTROMAGNETICALLY OPERATED DOSING VALVE, WITH BALL SHUTTER, FOR A FUEL INJECTOR. |
GB9714647D0 (en) * | 1997-07-12 | 1997-09-17 | Lucas Ind Plc | Injector |
IT1296143B1 (en) * | 1997-11-18 | 1999-06-09 | Elasis Sistema Ricerca Fiat | CONTROL DEVICE FOR A FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINES. |
DE29814934U1 (en) | 1998-08-20 | 2000-01-05 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
-
2000
- 2000-09-12 DE DE10044933A patent/DE10044933A1/en not_active Withdrawn
-
2001
- 2001-08-04 DE DE50111561T patent/DE50111561D1/en not_active Expired - Lifetime
- 2001-08-04 WO PCT/DE2001/002986 patent/WO2002023037A1/en active IP Right Grant
- 2001-08-04 US US10/129,926 patent/US6712295B2/en not_active Expired - Fee Related
- 2001-08-04 JP JP2002527655A patent/JP2004509268A/en active Pending
- 2001-08-04 EP EP01957756A patent/EP1319128B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0223037A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20030132318A1 (en) | 2003-07-17 |
JP2004509268A (en) | 2004-03-25 |
EP1319128B1 (en) | 2006-11-29 |
WO2002023037A1 (en) | 2002-03-21 |
US6712295B2 (en) | 2004-03-30 |
DE50111561D1 (en) | 2007-01-11 |
DE10044933A1 (en) | 2002-03-21 |
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