CN101910607A - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- CN101910607A CN101910607A CN200880124435XA CN200880124435A CN101910607A CN 101910607 A CN101910607 A CN 101910607A CN 200880124435X A CN200880124435X A CN 200880124435XA CN 200880124435 A CN200880124435 A CN 200880124435A CN 101910607 A CN101910607 A CN 101910607A
- Authority
- CN
- China
- Prior art keywords
- valve
- spring members
- fuelinjection nozzle
- actuator
- valve cage
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 24
- 238000002347 injection Methods 0.000 title claims abstract description 11
- 239000007924 injection Substances 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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
- 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
- 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
- F02M61/167—Means for compensating clearance or thermal expansion
-
- 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
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
Abstract
A fuel injection valve (1) is preferably configured as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines. The fuel injection valve (1) comprises a piezoelectric actuator (2) and a valve needle (14) that can be directly actuated by the actuator (2). Further, a throttle plate (7) is provided with an intake throttle (8) and an outlet throttle (24) which feed into a control space (9). The control space (9) is delimited by a front surface (13) of the valve needle (14) and a first side (10) of the throttle plate (7). Further, in order to control the outlet throttle (24), a valve sleeve (21) is provided at a second side (11) of the throttle plate (7) facing away from the first side (10) of the throttle plate (7), said sleeve being actuatable by the actuator (2) against a spring force of a first spring element (40) for release of the outlet throttle (24), wherein the actuator (2) can be actuated against a spring force of a second spring element (41). Upon release of the outlet throttle (24), the pressure in the control space (9) drops such that the valve needle (14) is actuated.
Description
Technical field
The present invention relates to be provided with the Fuelinjection nozzle of a piezoelectric actuator.The invention particularly relates to the sparger field of the fuel injection system that is used for compressed-air actuated self ignition formula internal-combustion engine.
Background technique
By DE 103 26 259A1 known a kind ofly be used for sparger internal-combustion engine, that be particularly useful for compressed-air actuated self ignition formula internal-combustion engine.Wherein be provided with a piezoelectric actuator that is arranged in the injector body, this piezoelectric actuator by first spring assembly at a side and injector body and keep in touch at opposite side and a sleeve shape conversion piston.Also be provided with a nozzle body that be connected with injector body, that be provided with jet expansion, the valve needle of a stage shape axially is directed in this nozzle body movably.Be provided with second spring assembly in this external conversion piston, it makes during valve needle is maintained in its closed position with the jet pressure that acts on valve needle overleaf.The control room of a valve needle side end that is formed in the conversion piston forms by a leakage-gap and fuel input channel under being in jet pressure and is connected, and wherein the fuel that is positioned in the control room of valve needle loads opening on the direction.Thus can be by the control of piezoelectric actuator realization to valve needle.
Have its shortcoming by the known sparger of DE 103 26 259A1, promptly for example when engine starting, can be present in gaseous component in the conversion piston area, especially air can influence service behaviour at least on certain starting time.This especially can cause problem during cranking internal combustion engine after long dead time.
Summary of the invention
Fuelinjection nozzle with feature of claim 1 according to the present invention by contrast has its advantage, promptly also can accomplish reliable work at starting period or after long dead time.Especially the reliability that can improve Fuelinjection nozzle reaches the reliability of improving the internal-combustion engine that is provided with this Fuelinjection nozzle thus.
The favourable further configuration of the Fuelinjection nozzle that can obtain providing in the claim 1 by the measure described in the dependent claims.
Advantageously, valve cage has a support cover; And actuator is set at, and valve cage is interior also to be supported on the support cover internally.Can obtain the configuration of a compactness thus, wherein the axis of Fuelinjection nozzle is axially directed relatively for actuator.
In addition advantageously, be provided with a valve piece, this valve piece is pressed on second side of Rectifier plate; And valve piece section ground is surrounded by valve cage on circumference.In the case also advantageously, structure has second control room of an annular between valve piece and valve cage, and the current drainage throttle valve that prolongs by the valve piece feeds in this second control room.By realizing second control room and part or whole being connected of actuation chamber to the operation of valve cage, in this actuation chamber, be provided with the actuator that surrounds by valve cage, so that can partly or wholly discharge the current drainage throttle valve by piezoelectric actuator.The pressure that acts on the needle end face in the control room is reduced, and this just causes the operation of needle and fuel is gone out by fuel injection valves inject.
In addition advantageously, second spring members is in piezoelectric actuator is set at valve cage, and wherein a side of second spring members is supported on the valve piece and opposite side is supported on the actuator at least indirectly.Can come the temperature variation of the member of compensate for fuel injection valve to reach by first spring members and second spring members in the case and compensate its length change thus.In addition advantageously, second spring members is configured to relatively hard, and that first spring members is configured to is relatively soft, in other words, the spring constant of first spring members less than, and especially significantly less than the spring constant of second spring members.The compression of second spring members make the loss of travel that relates to the piezoelectric actuator operation keep as much as possible little thus, because can be represented the loss of travel of actuator.The stroke of piezoelectric actuator at least mainly causes the compression of first spring members thus.
Spring members is preferably configured as sleeve, and the compression and the axially symmetrical power that especially can reach the axial symmetry of spring members thus apply.The valve cage structure has one or more openings in addition, and these openings are configured the inner room that makes valve cage and are connected with actuation chamber, so that allows the exchange of medium, especially allows the discharge of gaseous component, particularly air.
Description of drawings
To describe the preferred embodiments of the present invention in detail by accompanying drawing in the following description.Accompanying drawing is represented:
Fig. 1: the perspective cross-sectional slice that is provided with the Fuelinjection nozzle of a piezoelectric actuator according to an embodiment of the invention.
Concrete form of implementation
Fig. 1 represents the Fuelinjection nozzle 1 that is provided with a piezoelectric actuator 2 according to an embodiment of the invention.This Fuelinjection nozzle 1 especially can be used as the sparger of the fuel injection system of compressed-air actuated self ignition formula internal-combustion engine.An advantageous applications of Fuelinjection nozzle 1 is to be provided with a fuel injection system of rail (common-Rail) altogether, and this common rail imports in a plurality of Fuelinjection nozzles 1 diesel fuel that is under the high pressure.But Fuelinjection nozzle 1 according to the present invention also is suitable for other applicable cases.
Fuelinjection nozzle 1 has a valve chest 3.Structure has a pressure hole 4 in valve chest 3, and the fuel that is under the high pressure can import in the fuel chambers 5 of valve chest 3 inside by this pressure hole.Pressure hole 4 section 6 is by a Rectifier plate 7 in the case, and this Rectifier plate is connected with valve chest 3 by rights.Branch out an input throttle valve 8 by pressure hole 4, this input throttle valve is set in the Rectifier plate 7.The input throttle valve makes fuel import a control room 9, and this control room 9 limits by an end face 13 of first side 10, control room sleeve 12 and the needle 14 of Rectifier plate 7.Therefore in reset condition, in the control room, have the fuel that is under the high pressure, so that needle 14 is pressed towards valve body 15 ground.Structure has a valve seat surface 16 on valve body 15, and this valve seat surface and needle 14 actings in conjunction reach and are sealed and matched.
Structure has an actuation chamber 20 in this external valve chest 3.Here on second side of carrying with its first side 10 11 that actuation chamber 20 is positioned at Rectifier plate 7.Be provided with a valve cage 21 and a valve piece 22 in actuation chamber 20, wherein valve piece 22 directly is positioned on second side 11 of Rectifier plate 7.Be provided with a bore section 23 in valve piece 22, this bore section prolongs a current drainage throttle valve 24 that is formed in the Rectifier plate 7.Current drainage throttle valve 24 makes control room 9 be connected with second control room 25 of an annular thus, and this second control room is formed between valve piece 22 and the valve cage 21.In order to construct second control room 25, structure has a circular groove on the cylindrical outer side face 26 of valve piece 22 in this embodiment.Valve piece 22 has a stage 27 in addition, and the relative valve cage 21 of this stage constitutes a valve seat, so that second control room 25 separates with remaining actuation chamber 20 in the configuration shown in Fig. 1.
Valve cage 21 has an inner room 30, and this inner room reaches the support cover 31 that passes through valve cage 21 on the other hand by valve piece 22 on the one hand and the wall that passes through valve cage 21 on circumference 32 limits.In valve cage 21, be provided with hole 33,34, so that being connected between the inner room 30 that forms valve cage 21 and the actuation chamber 20.Especially an opening 35 in the 34 formation valve pieces 22 of hole forms inner room 30 of valve cage 21 and the balance between the actuation chamber 20 by its.
Be provided with first spring members 40 in this external actuation chamber 20, it is configured sleeve.One side of first spring members 40 is supported on the valve chest 3 and opposite side is supported on the support cover 31 of valve cage 21.First spring members 40 has certain pre-bias voltage, so that valve cage 21 is pressed on the stage 27 of valve piece 22, makes the valve seat closure that is formed between valve piece 22 and the valve cage 21 thus.
Be provided with the piezoelectric actuator 2 and second spring members 41 in the inner room 30 of this external valve cage 21.Here piezoelectric actuator 2 is supported on the support cover 31 of valve cage 21, and a side of second spring members 41 is supported on the valve piece 22 and opposite side is supported on the piezoelectric actuator 2.Second spring members 41 has certain pre-bias voltage, and piezoelectric actuator 2 is pre-compacted thus.
At first be that second spring members 41 shortens when operation piezoelectric actuator 2, till the pre-biasing force that reaches first spring members 40.First spring members 40 is compressed and shortens thus then, so that valve cage 21 is lifted by the valve seat that is formed on the stage 27.When the spring force of first spring members 40 during again greater than the spring force of second spring members 41, second spring members 41 is compressed again, till it surpasses the spring force of first spring members 40 again then.Therefore first spring members 40 little by little is compressed.Valve cage 21 is also little by little raised thus.So open towards actuation chamber 20 in second control room 25, thus current drainage throttle valve 24 is released and control room 9 in the pressure of fuel descend.The power on the needle 14 of acting on effectively then is 9 direction towards the control room, lifts on the valve seat surface 16 of needle 14 by its valve seat thus and fuel is ejected by sealing seat and the spray orifice of opening 42 by fuel chambers 5.
Discharge fuel sparger 1 by piezoelectric actuator 2 cuts out again.Realize valve cage 21 resetting by first spring members 40 in the case to the home position shown in Fig. 1.Be close to again on the valve seat that the stage 27 by valve piece 22 constitutes at this home position upper valve sleeve tube 21.Second control room 25 is closed again in the case, so that the pressure in the control room 9 rises on the high pressure again and produces the effective power that is used for needle 14 is closed to the home position shown in Fig. 1.
Fuelinjection nozzle 1 has an axis 45.By described configuration, piezoelectric actuator 2 is axis 45 centerings of Fuelinjection nozzle 1 relatively. Spring members 40,41 axis 45 orientations relatively in addition, wherein the configuration that constitutes sleeves by spring members 40,41 can realize that the power of the symmetry of spring members 40,41 puts to good use.Therefore obtain a compact structure and the high reliability of Fuelinjection nozzle 1.The component of gaseous state, the air that especially is present in the valve chest 3 at the Fuelinjection nozzle starting period can be removed in an advantageous manner in addition.Especially when Fuelinjection nozzle 1 is devoted oneself to work, at first make control room 9 and make second control room 25 inject the fuel that is under the high pressure by current drainage throttle valve 24 thus by input throttle valve 8.The component of gaseous state is discharged by control room 9,25 in the case.Guaranteed the ability to work of Fuelinjection nozzle 1 thus from the beginning.Problem in the time of can preventing engine starting thus.
The present invention is not limited on the described embodiment.
Claims (10)
1. Fuelinjection nozzle (1), be particularly useful for the sparger of the fuel injection system of compressed-air actuated self ignition formula internal-combustion engine, having a piezoelectric actuator (2) and one can be is characterized in that by the needle (14) of this actuator (2) indirect operation: be provided with a Rectifier plate (7) that has at least one current drainage throttle valve (24); Be provided with a control room (9), this control room is limited by an end face (13) of described needle (14) and first side (10) of described Rectifier plate (7), and wherein, described control room (9) is given in described current drainage throttle valve (24) configuration; In order to control described current drainage throttle valve (24), on second side (11) that described Rectifier plate (7) and described first side (10) described Rectifier plate (7) are carried, be provided with a valve cage (21), this valve cage can be by the operation of the spring force ground of described actuator (2) opposing first spring members (40), to discharge described current drainage throttle valve (24) at least in part; The spring force that described actuator (2) can be resisted second spring members (41) is operated.
2. according to the Fuelinjection nozzle of claim 1, it is characterized in that: described valve cage (21) has a support cover (31), and described actuator (2) is set in the described valve cage (21) and is supported on the described support cover (31).
3. according to the Fuelinjection nozzle of claim 2, it is characterized in that: be provided with a valve piece (22), this valve piece abuts on second side (11) of described Rectifier plate (7), and described valve piece (22) section ground is at least surrounded by described valve cage (21) on circumference.
4. according to the Fuelinjection nozzle of claim 3, it is characterized in that: be configured with second control room (25) of an annular between described valve piece (22) and described valve cage (21), the described current drainage throttle valve (24) that prolongs by described valve piece (22) feeds in this second control room.
5. according to the Fuelinjection nozzle of claim 4, it is characterized in that: described second spring members (41) is set in the described valve cage (21).
6. according to the Fuelinjection nozzle of claim 5, it is characterized in that: a side of described second spring members (41) is supported on the described valve piece (22) and opposite side is supported on the described actuator (2) at least indirectly.
7. according to the Fuelinjection nozzle of one of claim 1 to 6, it is characterized in that: described first spring members (40) is configured to sleeve and/or described second spring members (41) is configured to sleeve.
8. according to the Fuelinjection nozzle of one of claim 1 to 7, it is characterized in that: described valve cage (21) is arranged in the actuation chamber (20), described valve cage (21) has at least one opening (35), and the inner room (30) of described valve cage (21) is connected with described actuation chamber (20) by this opening.
9. according to the Fuelinjection nozzle of one of claim 1 to 8, it is characterized in that: in reset condition, the spring force of described first spring members (40) is greater than the spring force of described second spring members (41).
10. according to the Fuelinjection nozzle of one of claim 1 to 9, it is characterized in that: the spring constant of described first spring members (40) is less than the spring constant of described second spring members (41).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008003851.2 | 2008-01-10 | ||
| DE200810003851 DE102008003851A1 (en) | 2008-01-10 | 2008-01-10 | Fuel injector |
| PCT/EP2008/066708 WO2009086997A1 (en) | 2008-01-10 | 2008-12-03 | Fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101910607A true CN101910607A (en) | 2010-12-08 |
Family
ID=40379811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880124435XA Pending CN101910607A (en) | 2008-01-10 | 2008-12-03 | Fuel injection valve |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2232045B1 (en) |
| CN (1) | CN101910607A (en) |
| DE (1) | DE102008003851A1 (en) |
| WO (1) | WO2009086997A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653374A (en) * | 2015-02-11 | 2015-05-27 | 江苏大学 | Split type oil injector body |
| CN109923296A (en) * | 2016-11-03 | 2019-06-21 | 罗伯特·博世有限公司 | For spraying the fuel injection valve of fuel gas and/or liquid fuel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012083459A1 (en) * | 2010-12-21 | 2012-06-28 | Tpp Energy Solutions Inc. | Device for increasing the efficiency of an internal combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10326259A1 (en) | 2003-06-11 | 2005-01-05 | Robert Bosch Gmbh | Injector for fuel injection systems of internal combustion engines, in particular direct injection diesel engines |
| DE602004004254T2 (en) * | 2004-06-30 | 2007-07-12 | C.R.F. S.C.P.A. | Servo valve for controlling an injection valve of an internal combustion engine |
| DE102005007543A1 (en) * | 2005-02-18 | 2006-08-24 | Robert Bosch Gmbh | Fuel injector with direct needle control for an internal combustion engine |
| DE102005059437A1 (en) * | 2005-12-13 | 2007-06-14 | Robert Bosch Gmbh | fuel injector |
-
2008
- 2008-01-10 DE DE200810003851 patent/DE102008003851A1/en not_active Withdrawn
- 2008-12-03 WO PCT/EP2008/066708 patent/WO2009086997A1/en active Application Filing
- 2008-12-03 EP EP08870377A patent/EP2232045B1/en not_active Not-in-force
- 2008-12-03 CN CN200880124435XA patent/CN101910607A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653374A (en) * | 2015-02-11 | 2015-05-27 | 江苏大学 | Split type oil injector body |
| CN104653374B (en) * | 2015-02-11 | 2017-04-12 | 江苏大学 | Split type oil injector body |
| CN109923296A (en) * | 2016-11-03 | 2019-06-21 | 罗伯特·博世有限公司 | For spraying the fuel injection valve of fuel gas and/or liquid fuel |
| CN109923296B (en) * | 2016-11-03 | 2021-12-21 | 罗伯特·博世有限公司 | Fuel injection valve for injecting gaseous and/or liquid fuels |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008003851A1 (en) | 2009-07-16 |
| EP2232045B1 (en) | 2013-02-20 |
| EP2232045A1 (en) | 2010-09-29 |
| WO2009086997A1 (en) | 2009-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20101208 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |