EP1159526B1 - Stellantrieb für einen kraftstoffinjektor - Google Patents
Stellantrieb für einen kraftstoffinjektor Download PDFInfo
- Publication number
- EP1159526B1 EP1159526B1 EP00920356A EP00920356A EP1159526B1 EP 1159526 B1 EP1159526 B1 EP 1159526B1 EP 00920356 A EP00920356 A EP 00920356A EP 00920356 A EP00920356 A EP 00920356A EP 1159526 B1 EP1159526 B1 EP 1159526B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- transmission element
- base part
- fuel injector
- area
- 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.)
- Expired - Lifetime
Links
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
- 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
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
Definitions
- the invention relates to an actuator for a Fuel injector according to the preamble of claim 1.
- Ein Such actuator is known from EP-A-0790402.
- a fuel injector having a piezoelectric actuator, the with the help of a mechanical transmission element, a nozzle needle in the fuel injector.
- the transmission element has two differently long lever arms, which are connected at right angles to each other, the Transmission element in this angular range on the housing of the Fuel injector is supported.
- the shorter lever arm of the Transmission element lies on the piezoelectric actuator on, one supported on the housing of the fuel injector Return spring ensures a permanent contact.
- the longer one Lever arm of the transmission element is in communication with the Rear side of the nozzle needle, one arranged around the nozzle needle Return spring holds the nozzle needle on the lever arm.
- the deflection of the piezoelectric actuator becomes the transmission element around a pivot at his on the case rotated angle range of the fuel injector, so that the longer lever arm up from the back of the Nozzle needle is moved away.
- the Force of the return spring tracked the nozzle needle, causing the fuel injector opens and fuel into one Combustion chamber of an internal combustion engine is injected.
- the deflection of the piezoelectric actuator is in implemented a greater deflection of the nozzle needle.
- the object of the present invention is an actuator for a fuel injector to provide through a simple structure and a reliable magnification the deflection of an actuator in the actuator, the used for actuating a nozzle needle in the fuel injector should be distinguished.
- the actuator according to the invention for a fuel injector is characterized by a flexurally elastic transmission element out, between an actuator and a nozzle needle is arranged and has a plate-like cross-section.
- the flexurally elastic transmission element stands thereby on its underside in a central area in an operative connection with the nozzle needle and on its top in one Outside in an operative connection with the actuator, wherein the flexurally elastic transmission element in addition to his Bottom supported on a housing of the fuel injector is.
- the transmission element Due to the inventive design of the transmission element its space requirement is reduced to a minimum. Furthermore, the transmission element can be formed in one piece be without a return spring is necessary. About that In addition, the path reversal of the deflection of the actuator is a Outwardly opening operative connection with the nozzle needle allows, so that a simple embodiment of this Achieve active compound. Finally, that stands out Transmission element by a high wear resistance and thus good functional reliability.
- the drawing shows an embodiment of an inventive Actuator for a fuel injector in cross section.
- a fuel injector has an injector 1 with a multi-stage inner bore 11, in the one piezoelectric actuator 2 and a piston-shaped actuator 3rd are arranged.
- the piston-shaped actuator 3 is here preferably directly with a nozzle needle (not shown) in Fuel injector coupled.
- the piezoelectric actuator 2 is made up of several stacked piezoelectric Actuator elements 21 constructed in a spring-elastic Hollow body 22 are arranged. This hollow body 22 is connected to a top plate 23 and a bottom plate 24, wherein the stacked piezoelectric Actuator 21 with a defined force of preferably 800 to 1000 N are biased.
- the actuator elements 21 are conductive with the head plate 23 protruding contact pins (not shown) connected to which in a patch on the actuator Actuator 4 a voltage is applied, creating a Longitudinal strain in the piezoelectric actuator 2 is caused.
- the piezoelectric actuator 2 is further in an actuator housing 25 arranged at the top of the injector housing 1 trained inner bore 11 is firmly clamped.
- the actuator housing 25 on a shim 26th pressed, which rests on a first bore stage 12.
- the Actuator housing 25 is held by a hollow screw 29, which revolve around a on the actuator housing 25 Clamping ring 28 engages and bolted to the injector 1 is.
- the bottom plate 24 of the piezoelectric actuator is centered provided with a preferably circular attachment 241.
- a disc-shaped sealing membrane 26 arranged, extending from the bottom plate 24 to the inner wall of the injector 1 extends.
- the sealing membrane 26 is in their outer area between the shim 27 and the Actuator housing 25 held and serves to the piezoelectric Actuator 2 from a leakage of fuel from the Protect fuel injector.
- This Transmission element 5 consists of a flexurally elastic, preferably made of spring steel bottom part 51, a highly rigid cover plate arranged on the bottom part 51 52 and arranged below the bottom part 51 valve ball 53 together.
- the flexurally elastic bottom part 51 of the Transmission element 5 is substantially disc-shaped formed and has a plate-like cross-section on, with it with its underside in an annular Support area 511 rests on the second hole stage 13.
- the bottom part 51 is further starting from the support area 511 bent upwards at an outer area 512, wherein on the edge 514 of this outer region 512, the cover plate 52 attached with its bottom.
- This cover plate 52 is with her back still firmly with the essay 241 at the Bottom plate 24 of the actuator connected.
- At the bottom part 51 of the Transmission element 5 is on the bottom in a central region 513 also firmly attached the valve ball 53.
- valve ball 53 is in the second bore stage 13 associated with a valve seat 14.
- This valve seat 14 is over a through bore 15 with a control chamber 16, which in the Inner bore 11 is formed above the actuator 3, connected.
- the control chamber 16 also has a throttle bore 17 a connection to a fuel supply 18th in the injector 1, in the fuel under a high Pressure is.
- the transmission ratio of Aktorausschung to the deflection of the central region 513 of the bottom part 51 and so that the deflection of the valve ball 53 depends on the ratio between the effective distance of the edge 514 to the support area 512 and the effective distance from the support area 511 to the center area 513. If - as shown in the drawing - The effective distance from the center region 513 to the support area 511 of the bottom part 51 is larger than the effective one Distance from the support area 511 to the edge 514 of the bottom part 51, the deflection of the piezoelectric actuator 2, in a increased displacement of the valve ball 53 translated. A such translation is particularly in the embodiment used piezoelectric actuator 2 of advantage because the deflection moves in the micron range, so that a Increase this deflection for a reliable positioning process helpful.
- the piezoelectric actuator 2 retracts together and returns to its position shown in the drawing back.
- the bottom plate 24 of the piezoelectric actuator 2 and thus the fixed to the top 241 of the bottom plate 24 Cover plate 52 of the transmission element 5 also returns back to the starting position. Because of her elastic Interpretation then takes the bottom plate 51 back to its original Shape, wherein the central region 513, the valve ball 53 presses on the valve seat 14 and thus the through hole 15 closes.
- the fuel pressure in the control room 16 rises again and the actuator is replaced by the move the resulting fuel pressure down so that the nozzle needle in the fuel injector closes and the Injection process is terminated.
- Essential to the inventive design of the transmission element 5 is the flexurally elastic design of the bottom part 51, which ensures that the inward Movement of the piezoelectric actuator 2 during the deflection in an outward movement of the center region 513 on Transmission element 51 is reversed, via the operative connection with the actuator 3 for controlling the nozzle needle is being used.
- This way reversal allows a simplified Design of the operative connection between the transmission element 5 and the actuator or the nozzle needle, since the active compound can easily open to the outside.
- Farther ensures the bending elastic design of the bottom part 51 of the transmission element 5, that this bottom part 51st automatically after the end of the deflection of the actuator 2 in his original situation returns, so that no additional Return spring is necessary.
- the exact positioning of the Actuator 2 with respect to the transmission element 5 can be by choosing a suitable shim 27 between the actuator housing 25 and the first bore stage 12 in the injector 1 reach.
- the in the drawing may also be a piezoelectric actuator other actuator principle can be used.
- the in the drawing shown hydraulic control of the actuator 3 also by a direct action of the bottom part 51st of the transmission element 5 are replaced on the actuator.
- the bottom plate 24 of the Actuator 2 - instead of the cover plate 52 - directly to the bottom part 51 of the transmission element 5 to connect.
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 (5)
- Stellantrieb für einen Kraftstoffinjektor mit einem Aktor (2) und einem Übertragungselement (5), die in einer Innenbohrung (11) eines Gehäuses (1) des Kraftstoffinjektors angeordnet sind, wobei das Übertragungselement in einer Wirkverbindung mit dem Aktor (2) und über eine Ventilkugel (53) in einer Wirkverbindung (3, 14, 15, 16, 17, 53) mit einer Düsennadel im Kraftstoffinjektor steht, um eine Auslenkung des Aktors in eine Bewegung der Düsennadel umzusetzen,
dadurch gekennzeichnet, daß
das Übertragungselement (5) mindestens einen einstückig ausgebildeten, biegeelastischen und im wesentlichen scheibenförmigen Bodenteil (51) aufweist, der im Querschnitt tellerartig ist,
wobei der Bodenteil eine dem Aktor abgewandte Ausbuchtung aufweist, die einen Auflagebereich (511) bildet,
wobei der Bodenteil in seinem Auflagebereich (511) an einer Stufe (13) der Innenbohrung (11) abgestützt ist,
wobei die Wirkverbindung zum Aktor (2) an einem Außenbereich (512) des Bodenteils (51) angeordnet ist,
wobei die Ventilkugel (53) an einem Mittenbereich (513) des Bodenteils (51) angeordnet ist,
wobei ein Ventilsitz (14) der Ventilkugel (53) in der Stufe (13) angeordnet ist,
wobei die Ausbuchtung zwischen dem Mittenbereich (513) und dem Außenbereich (512) angeordnet ist. - Stellantrieb gemäß Anspruch 1, dadurch gekennzeichnet, daß das Übertragungselement aus dem Bodenteil (51) und einer steifen Deckplatte (52) besteht, wobei die Deckplatte fest mit einer Bodenplatte (24) des Aktors (2) und einem Rand (514) des Bodenteils (51) verbunden ist.
- Stellantrieb gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Wirkverbindung zwischen dem Übertragungselement (5) und der Düsennadel einen Steuerraum (16) und ein Stellglied (3) umfaßt, wobei ein hydraulischer Druck im Steuerraum (16) durch die Ventilkugel (53), die mit dem Mittenbereich (513) des Bodenteils (51) verbunden ist, gesteuert wird.
- Stellantrieb gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein effektiver Abstand vom Mittenbereich (513) zum Auflagebereich (511) des Bodenteils (51) größer ist als ein effektiver Abstand vom Auflagebereich (511) zum Rand (514) des Bodenteils (51), so daß eine Auslenkung des Aktors (2) in eine vergrößerte Auslenkung des Mittenbereichs (513) des Bodenteils (51) übersetzt wird.
- Stellantrieb gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Aktor (2) nach dem piezoelektrischen Prinzip arbeitet.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19909539A DE19909539C2 (de) | 1999-03-04 | 1999-03-04 | Stellantrieb für einen Kraftstoffinjektor |
DE19909539 | 1999-03-04 | ||
PCT/DE2000/000629 WO2000052322A1 (de) | 1999-03-04 | 2000-03-01 | Stellantrieb für einen kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1159526A1 EP1159526A1 (de) | 2001-12-05 |
EP1159526B1 true EP1159526B1 (de) | 2005-05-18 |
Family
ID=7899714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00920356A Expired - Lifetime EP1159526B1 (de) | 1999-03-04 | 2000-03-01 | Stellantrieb für einen kraftstoffinjektor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1159526B1 (de) |
DE (2) | DE19909539C2 (de) |
WO (1) | WO2000052322A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19939476C2 (de) * | 1999-08-20 | 2003-02-20 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE10029067B4 (de) * | 2000-06-13 | 2006-03-16 | Siemens Ag | Einspritzventil mit vorgespanntem Schließglied |
DE10118563A1 (de) * | 2001-04-14 | 2002-11-07 | Bosch Gmbh Robert | Piezoelektrisches Aktormodul |
DE10216154A1 (de) | 2002-04-12 | 2003-10-23 | Hydraulik Ring Gmbh | Druckbegrenzungsventil, insbesondere für Diesel-Hochdruckpumpen von Einspritzvorrichtungen in Kraftfahrzeugen |
DE10216153A1 (de) | 2002-04-12 | 2003-10-23 | Hydraulik Ring Gmbh | Drosselventil,insbesondere für Diesel-Hochdruckpumpen von Einspritzvorrichtung in Kraftfahrzeugen |
US6739575B2 (en) | 2002-06-06 | 2004-05-25 | Caterpillar Inc | Piezoelectric valve system |
DE102011056096B4 (de) * | 2011-12-06 | 2014-06-26 | Pierburg Gmbh | Elektromagnetventil |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022166A (en) * | 1975-04-03 | 1977-05-10 | Teledyne Industries, Inc. | Piezoelectric fuel injector valve |
JPS62157274A (ja) * | 1985-12-28 | 1987-07-13 | Aisan Ind Co Ltd | 燃料噴射弁 |
DE4101076A1 (de) | 1990-01-18 | 1991-08-08 | Heinz Doevenspeck | Verfahren und vorrichtung zur behandlung mehrphasiger stoffe |
DE59010904D1 (de) * | 1990-09-25 | 2000-05-31 | Siemens Ag | Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors |
JP3740733B2 (ja) * | 1996-02-13 | 2006-02-01 | いすゞ自動車株式会社 | 内燃機関の燃料噴射装置 |
DE19714486C2 (de) * | 1997-04-08 | 1999-12-30 | Siemens Ag | Vorrichtung zum Übertragen einer Auslenkung eines Aktors |
DE19802495A1 (de) * | 1997-06-19 | 1998-12-24 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
-
1999
- 1999-03-04 DE DE19909539A patent/DE19909539C2/de not_active Expired - Fee Related
-
2000
- 2000-03-01 DE DE50010351T patent/DE50010351D1/de not_active Expired - Lifetime
- 2000-03-01 EP EP00920356A patent/EP1159526B1/de not_active Expired - Lifetime
- 2000-03-01 WO PCT/DE2000/000629 patent/WO2000052322A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO2000052322A1 (de) | 2000-09-08 |
EP1159526A1 (de) | 2001-12-05 |
DE19909539C2 (de) | 2001-02-08 |
DE19909539A1 (de) | 2000-10-05 |
DE50010351D1 (de) | 2005-06-23 |
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