EP1432908A1 - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- EP1432908A1 EP1432908A1 EP02742719A EP02742719A EP1432908A1 EP 1432908 A1 EP1432908 A1 EP 1432908A1 EP 02742719 A EP02742719 A EP 02742719A EP 02742719 A EP02742719 A EP 02742719A EP 1432908 A1 EP1432908 A1 EP 1432908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- sleeve
- fuel injection
- injection valve
- fuel
- 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 67
- 238000002347 injection Methods 0.000 title claims abstract description 23
- 239000007924 injection Substances 0.000 title claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 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
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
Definitions
- the invention relates to a fuel injector according to the preamble of the main claim.
- a fuel injector according to the preamble of claim 1 is known from DE 40 05 455.
- the fuel injection valve for an internal combustion engine has at least one spray opening which is connected to at least one supply line for fuel under pressure.
- a valve needle which closes or opens the spray opening, is connected to a piezoelectric actuator.
- a spring diaphragm seals a first space that is free of fuel and contains the actuator against a second space that contains fuel. The spring lead creates a closing force acting on the valve needle. The actuator that is not actuated is loaded with this closing force.
- a disadvantage of this known prior art is that the actuator is charged in addition to the closing force of the spring diaphragm • with a pressure force of the fuel. This pressure force compresses the actuator and ⁇ reduces the initial length of the unactuated actuator. An unacceptably large game arises. the transmission path between actuator and valve closing body. When pressing the Part of the stroke is lost to the actuator to overcome this game.
- the fuel injector according to the invention with the characterizing features of the main claim has the advantage that only a slight change in a biasing force occurs.
- an increased fuel pressure acts on the surface outwardly curved tons sleeve Tonnenhulse is compressed and exerts a force aufsp Dahlende in its longitudinal direction between the valve body and the actuator head.
- the fuel pressure which also acts on the actuator head, counteracts this with an opposing force.
- it can thus be prevented that the actuator is compressed by an increasing fuel pressure and that the output length of the actuator changes inadmissibly large.
- the contour of the barrel sleeve in longitudinal section and the elasticity of the material from which the barrel sleeve is made are advantageously coordinated with one another in such a way that the surface of the barrel sleeve covers the same volume as the actuator head when the pressure of the surrounding fuel increases.
- the contour line of the barrel sleeve is in relation to an imaginary center line. due to the axis of symmetry of the barrel sleeve, an essentially convex line curved outwards.
- the longitudinal section and the elasticity of the barrel sleeve are coordinated so that the change in length of the actuator corresponds to the expansion of the valve body when the pressure of the fuel increases.
- the valve body also expands. This can lead to errors in the transmission path of the opening force from the actuator to the valve closing body in that an impermissible play occurs between transmission components. This can be compensated for by a favorable choice of the behavior of the barrel sleeve when the pressure of the fuel changes.
- the power transmission ratio of the pressure force of the fuel exerted on the surface of the barrel sleeve in relation to the pressure force exerted on the actuator head it can be determined in which direction the output length of the actuator adapts when the pressure of the fuel changes.
- the barrel sleeve is adjoined by a cylinder-shaped spring sleeve which can be compressed in the longitudinal direction and a support ring lies between the barrel sleeve and the spring sleeve.
- the expansion compensation behavior of the barrel sleeve in connection with the actuator head can be set in a cost-effective manner for different actuators, without a particular barrel sleeve being necessary in each case.
- the spring sleeve is not radially compressible, but can only be compressed in the longitudinal direction. An adaptation to different actuator lengths is easily possible. Due to the inserted support ring, the function of the spring sleeve and is advantageous Barrel sleeve clearly separated and unwanted compression of the spring sleeve prevented.
- a spring sleeve enclosing the actuator is arranged within the barrel sleeve and non-positively connected to the valve body and the actuator head.
- This embodiment also makes it possible to use one and the same. Barrel sleeve to produce a different behavior with changing fuel pressure.
- FIG. 1 shows a schematic detailed section through a fuel injection valve according to the prior art in the area of the actuator
- FIG. 2 shows a schematic detail section through a first embodiment of a fuel injection valve according to the invention in the region of the actuator
- FIG. 3 shows a schematic detail section through a further embodiment of a fuel injection valve according to the invention in the area of the actuator and
- Fig. 4 shows a schematic detail section through a further embodiment of a fuel injector according to the invention in the region of the actuator.
- Fig. 1 shows a detail section through a fuel injector according to the prior art " in Area of a piezoelectric actuator 1, which is arranged on a carrier 2 and is sealed by a sealing sleeve 3 from the surrounding fuel-containing space.
- Carrier 2 and sleeve 3 are connected by a weld 4.
- the actuator 1 is biased in the direction of the carrier 2 via an actuator head 5 and a spiral spring 6, which is supported against an end plate 7.
- End plate 7 and sleeve 3 are interconnected via an annular weld 8 which seals against the fuel.
- the actuator head 5 has a pressure stamp 9 formed integrally therewith, which is guided through a recess in the carrier plate 7.
- a corrugated tube 10, which is connected to the Druckste pel 9 via a weld 11, is used for sealing.
- FIG. 2 shows a schematic detail section through a first embodiment of a fuel injection valve according to the invention in the area of a piezoelectric or magnetostrictive actuator 1.
- a fuel inlet 13 is provided in a valve body 12, which leads to a fuel chamber 14.
- the actuator 1 is identical to the actuator 1 in FIG. 1 according to the prior art.
- the actuator 1 is arranged between the valve body 12 and an actuator head 15.
- a barrel sleeve 16 is connected to the valve body 12 via a weld seam 17 and connected to the actuator head 15 via a further weld seam 18.
- the weld seams 17, 18 and the actuator head 15 and Barrel sleeve 16 seals the actuator 1, which is located in an actuator space 19, ' from the fuel space 14. Electrical supply lines can be led to the actuator 1 via connection channels 20.
- the barrel sleeve 16 When the pressure in the fuel chamber 14 is increased, the barrel sleeve 16 is compressed and approximates a cylindrical shape. However, this is counteracted by the force exerted on the actuator head 15 by the pressure of the fuel. At the same time, the barrel sleeve 16 has a pretension in the longitudinal direction of the actuator 1, so that the actuator 1 is loaded with its two ends on the valve body 12 and the actuator head 15 with a pretensioning force, which is directed towards one another, and on the valve body 12 and the valve head 15 abuts.
- the length of the actuator 1 is then only determined by the prestressing of the barrel sleeve 16. The length of the actuator 1 and thus the possible stroke is completely decoupled from the pressure prevailing in the fuel chamber 14. Furthermore, the simpler structure with fewer components and the shorter overall length of the unit comprising barrel sleeve 16, actuator 1 and actuator head 15 are advantageous. This can be seen clearly by comparison with FIG. 1.
- Fig. 3 shows a section through a further embodiment of an inventive
- the actuator 1 is arranged between the valve body 12 and the actuator head 15.
- the barrel sleeve 16 is connected to the weld seam 17 with the valve body 12.
- the present embodiment has a ⁇ spring sleeve 22, which between Actuator head 15 and barrel sleeve 16 is arranged.
- the spring sleeve 22 is connected to the actuator head 15 via a weld seam 23.
- a support ring 24 is arranged between barrel sleeve 16 and spring sleeve 22, with which the barrel sleeve 16 is connected via a weld seam 25 and the spring sleeve 22 via a further weld seam 26.
- the spring sleeve 22 is not radially compressible, but only in the longitudinal direction. This allows the characteristic of the longitudinal expansion of the actuator 1 over the pressure in a simple manner.
- Fuel chamber 14 can be adapted to a special application without the need for a specially adapted barrel sleeve 16 or a specially adapted actuator head 15.
- Fig. 4 shows a section through a further embodiment of an inventive
- the schematic structure corresponds to that of the embodiment in FIG. 2.
- the actuator 1 is arranged between the valve body 12 and the actuator head 15.
- the barrel sleeve 16 is fastened to the valve body 12 with the weld seam 17 and to the actuator head 15 with the weld seam 18.
- the fuel can flow into a fuel chamber 14 via a fuel inlet 13.
- the spring sleeve 27 is connected via a weld seam 29 to the valve body 12 and via a further weld seam 28 to the actuator head 15.
- the characteristic curve of the change in length of the actuator 1 can be controlled via the spring sleeve 27 when the pressure in the fuel chamber 14 increases. Since the spring sleeve 27 lies in the actuator chamber 19 and is not acted upon by the fuel in the fuel chamber 14, the external geometry of the spring sleeve 27 is not relevant. Since the spring sleeve 27 is non-positively connected to the valve body 12 via the weld seam 29 and also to the actuator head 15 via the weld seam 28 there is also a regulation that the
- Spring sleeve 27 exerts an additional tensile force. This makes it very cost-effective to set the
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 |
---|---|---|---|
DE10136807 | 2001-07-27 | ||
DE10136807A DE10136807A1 (en) | 2001-07-27 | 2001-07-27 | Fuel injection valve for IC engine uses piezoelectric or magnetostrictive actuator for operation of valve closure via valve needle |
PCT/DE2002/001641 WO2003012282A1 (en) | 2001-07-27 | 2002-05-07 | Fuel injection valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1432908A1 true EP1432908A1 (en) | 2004-06-30 |
EP1432908B1 EP1432908B1 (en) | 2005-01-26 |
Family
ID=7693403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02742719A Expired - Lifetime EP1432908B1 (en) | 2001-07-27 | 2002-05-07 | Fuel injection valve |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040046060A1 (en) |
EP (1) | EP1432908B1 (en) |
JP (1) | JP2004522069A (en) |
KR (1) | KR20040026691A (en) |
DE (2) | DE10136807A1 (en) |
WO (1) | WO2003012282A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7145282B2 (en) | 2004-07-15 | 2006-12-05 | Delphi Technologies, Inc. | Actuator |
DE102005029471B4 (en) * | 2005-06-24 | 2007-06-14 | Siemens Ag | Method for producing a hollow cylindrical spring |
DE102007008901B4 (en) | 2007-02-23 | 2008-10-16 | Compact Dynamics Gmbh | Fluid injection valve |
DE102008037276B4 (en) * | 2008-08-11 | 2011-02-10 | Continental Automotive Gmbh | Injector |
DE102010043110A1 (en) * | 2009-12-21 | 2011-06-22 | Robert Bosch GmbH, 70469 | Fuel injection valve for internal combustion engines |
US10039384B1 (en) * | 2017-03-29 | 2018-08-07 | Dongguan City Canaan Furniture Co., Ltd. | Anti-noise spring chair |
US10655523B2 (en) * | 2018-07-25 | 2020-05-19 | Tenneco Automotive Operating Company Inc. | Reagent injector freeze protection |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2032005A1 (en) * | 1970-06-29 | 1972-01-05 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injector |
US3788546A (en) * | 1972-06-26 | 1974-01-29 | Caterpillar Tractor Co | Fuel injection system |
DE2625141A1 (en) * | 1976-06-04 | 1977-12-22 | Bosch Gmbh Robert | VACUUM REGULATOR FOR A FUEL INJECTION SYSTEM |
JPH0794812B2 (en) * | 1987-12-29 | 1995-10-11 | トヨタ自動車株式会社 | Actuator for injector |
DE4005455A1 (en) * | 1989-02-28 | 1990-08-30 | Volkswagen Ag | Dosing valve for vehicle IC engine fuel injection - has piezoelectric actuator and spring membrane seal for closing force |
JP2692396B2 (en) * | 1991-02-22 | 1997-12-17 | 日本電気株式会社 | Piezoelectric actuator and manufacturing method thereof |
US5211341A (en) * | 1991-04-12 | 1993-05-18 | Siemens Automotive L.P. | Fuel injector valve having a collared sphere valve element |
DE19854506C1 (en) * | 1998-11-25 | 2000-04-20 | Siemens Ag | Dosing device with temperature compensation especially for vehicle fuel injection |
DE19856201A1 (en) * | 1998-12-05 | 2000-06-15 | Bosch Gmbh Robert | Piezoelectric actuator |
DE19908471A1 (en) * | 1999-02-26 | 2000-09-14 | Siemens Ag | Hollow cylindrical spring for control drive |
DE19912665A1 (en) * | 1999-03-20 | 2000-09-21 | Bosch Gmbh Robert | Fuel injector |
DE19912666A1 (en) * | 1999-03-20 | 2000-09-21 | Bosch Gmbh Robert | Fuel injector |
DE19947067A1 (en) * | 1999-09-30 | 2001-05-10 | Siemens Ag | Noise-damped actuator unit with actuator element for common rail fuel injection valve |
DE19962177A1 (en) * | 1999-12-22 | 2001-07-12 | Siemens Ag | Hydraulic device for transmitting an actuator movement |
-
2001
- 2001-07-27 DE DE10136807A patent/DE10136807A1/en not_active Withdrawn
-
2002
- 2002-05-07 EP EP02742719A patent/EP1432908B1/en not_active Expired - Lifetime
- 2002-05-07 WO PCT/DE2002/001641 patent/WO2003012282A1/en active IP Right Grant
- 2002-05-07 KR KR10-2004-7001115A patent/KR20040026691A/en not_active Application Discontinuation
- 2002-05-07 US US10/381,686 patent/US20040046060A1/en not_active Abandoned
- 2002-05-07 DE DE50202148T patent/DE50202148D1/en not_active Expired - Fee Related
- 2002-05-07 JP JP2003517439A patent/JP2004522069A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO03012282A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1432908B1 (en) | 2005-01-26 |
WO2003012282A1 (en) | 2003-02-13 |
DE10136807A1 (en) | 2003-02-13 |
KR20040026691A (en) | 2004-03-31 |
US20040046060A1 (en) | 2004-03-11 |
JP2004522069A (en) | 2004-07-22 |
DE50202148D1 (en) | 2005-03-03 |
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