WO2000034645A1 - Element de transfert d'un mouvement et soupape d'injection dote d'un tel element - Google Patents

Element de transfert d'un mouvement et soupape d'injection dote d'un tel element Download PDF

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Publication number
WO2000034645A1
WO2000034645A1 PCT/DE1999/003818 DE9903818W WO0034645A1 WO 2000034645 A1 WO2000034645 A1 WO 2000034645A1 DE 9903818 W DE9903818 W DE 9903818W WO 0034645 A1 WO0034645 A1 WO 0034645A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
drive piston
receiving element
actuator
valve
Prior art date
Application number
PCT/DE1999/003818
Other languages
German (de)
English (en)
Inventor
Wendelin KLÜGL
Gerd Schmutzler
Günter LEWENTZ
Stefan Lehmann
Johannes Fitzner
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2000034645A1 publication Critical patent/WO2000034645A1/fr

Links

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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • 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

Definitions

  • the invention relates to an element for transmitting a movement according to the preamble of claim 1 and in particular an injection valve with such an element.
  • an element is known from DE 197 08 304 AI.
  • High-pressure accumulator injection systems are increasingly being used to supply fuel to internal combustion engines.
  • Such injection systems are known as common rail systems (for diesel engines) and HPDI injection systems (for gasoline engines).
  • the fuel is fed with a high-pressure pump into a pressure accumulator common to all cylinders of the engine, from which the injection valves on the individual cylinders are supplied.
  • the opening and closing of the injection valves can be controlled electromagnetically or electrically, for example by means of piezo actuators, which consist of a number of stacked piezo elements.
  • the piezo actuator usually acts on a servo valve that hydraulically controls the pressure that is exerted on the nozzle needle of the injection valve.
  • the nozzle needle of the injection valve is therefore not controlled directly by the piezo actuator, but indirectly via the servo valve.
  • the element known from the publication mentioned at the outset for transmitting a movement consists of a transmission module which, when used in an injection valve, is arranged between the piezo actuator and a drive stamp for the servo valve.
  • the transmission module is essentially cylindrical and has a pressure chamber which is delimited by a flexible membrane.
  • the drive stamp for the service is located on the flexible membrane valve on.
  • a connecting bore with a throttling effect leads from the pressure chamber to a compensation chamber which is provided in the interior of the transmission module and is closed off by a prestressed spring plate.
  • the pressure chamber and the compensation chamber are filled with a hydraulic medium.
  • a rigid cover plate against which the piezo actuator rests is arranged above the compensation chamber.
  • the pressure of the transmission medium is transferred from the compensation chamber through the connecting bore into the pressure chamber, so that the flexible membrane always bears against the drive stamp, even if the total length of the arrangement changes due to thermal effects or aging effects.
  • the piezo actuator is actuated, the hydraulic transmission medium cannot get out of the fast enough
  • the known arrangement has the disadvantage of a complicated structure, since the connecting bore and the compensation chamber, including the spring plate which pressurizes the transmission medium, are formed within the transmission module.
  • the hydraulic transmission medium is enclosed under pressure in the transmission module. Even a slight leak in the system leads to a loss of transmission medium. The resulting pressure drop in the transmission module immediately results in a failure of the transmission module and thus of the injection valve.
  • the object of the present invention is therefore to design the element mentioned at the outset for transmitting a movement such that it is reliable with a simple structure. This object is achieved with the measures specified in claim 1. Preferred embodiments of the invention are set out in the claims following this claim 1.
  • the element according to the invention is preferably used in connection with an injection valve for internal combustion engines.
  • a play-compensating transmission element is provided between an actuator and an actuator, which comprises a drive piston and a receiving element, which engage telescopically and which enclose a chamber with a hydraulic medium.
  • the gap between the drive piston and the receiving element is dimensioned in such a way that a brief rise in pressure in the chamber is not compensated for, but longer-lasting pressure differences are reduced.
  • the transmission element according to the invention has the advantage of forming an open system which is not very sensitive to faults and with which varying distances can be compensated for and bridged. There are no complex shaped components; assembly is simple and component tolerances can be reduced.
  • Another advantage of the transmission element according to the invention is that the hydraulic medium is not under an increased pressure in the idle state. It is thus possible to connect the space around the transmission element in an injection valve, for example, to the essentially pressure-free fuel return system.
  • a piezo actuator 2 is installed in the housing 1 of the injection valve. When actuated electrically via feed lines (not shown), the piezo actuator 2 acts on a valve lifter 4 via a transmission element 3. The valve lifter 4 bears against a valve element 5 of a servo valve. As long as the piezo actuator 2 is not actuated, the valve element 5 is pressed into its valve seat 7 by a valve spring 6.
  • valve lifter 4 When the piezo actuator 2 is actuated, the valve lifter 4 lifts the valve element 5 from the valve seat 7, so that fuel can flow past the valve element 5 in the known manner and the injection valve thereby opens.
  • the transmission element 3 is designed as a hydraulic compensating element.
  • the transmission element 3 consists of a drive piston 31, which is fixedly attached to the piezo actuator 2 or is permanently connected to it, and a receiving element 32, which is permanently connected to the valve lifter 4 or is therefore of integral design.
  • the outer diameter of the receiving element 32 is larger than that of the drive piston 31.
  • Drive piston 31 and receiving element 32 thus form the inner part and outer part of a telescopic arrangement, for the longitudinal adjustment of the inner part and outer part, that is to say drive piston 31 and receiving element 32, are axially displaceable relative to one another, the distance s changing by which Cover drive piston 31 and receiving element 32 in the axial direction.
  • the chamber 322 is preferably radially symmetrical about the longitudinal axis of the transmission element 3.
  • a spring 33 is arranged in the chamber 322, preferably a spiral spring, which presses the drive piston 31 and the receiving element 32 apart in the axial direction.
  • the spring 33 thus causes the valve tappet 4 to always rest without play both on the drive piston 31 connected to the piezo actuator 2 and on the valve element 5 of the servo valve, even in the idle state, regardless of length tolerances, thermal changes in length and the like.
  • the end face of the drive piston 31 does not lie directly against the opposite end face of the depression 321 in the receiving element 32 outside the chamber 322.
  • the chamber 322 in the transmission element 3 is filled with a hydraulic medium.
  • the space 8 around the transmission element 3 in the housing 1 of the injection valve also contains hydraulic medium.
  • the hydraulic medium is preferably the fuel for the respective engine.
  • the hydraulic medium in space 8 can therefore, if the hydraulic medium is the fuel, for example, be connected to the substantially unpressurized fuel return line from the injection valve to the tank of the vehicle.
  • the space 8 can also be closed to the outside by membranes, sealing washers and the like.
  • the hydraulic medium in the idle state that is to say when the injection valve is closed, the piezo actuator 2 is not activated and thermal and other effects are balanced, is essentially not under an increased pressure. Only when the piezo actuator 2 is activated and its length is increased as a result, the drive piston 2 exerts pressure on the hydraulic medium. Since the hydraulic medium does not cause the rapid pressure increase associated therewith by rapid outflow through the narrow gap between the cylindrical outer wall of the drive piston 31 and the cylindrical inner wall of the receiving element
  • valve 32 can reduce, there is this pressure on the receiving element 32 to the valve tappet 4, so that the drive piston 31, receiving element 32 and valve tappet 4 move downward and push the valve element 5 of the servo valve away from the valve seat 7 against the action of the valve spring 6. ken.
  • the distance or gap between the cylindrical outer wall of the drive piston 31 and the cylindrical inner wall of the recess 321 in the receiving element 32 is, as said, so small that during the short time of actuation of the piezo actuator 2, the hydraulic medium cannot escape from the chamber 322 through this gap .
  • this distance or gap is dimensioned such that during the remaining, much longer period of a work cycle in which the valve is closed, liquid can flow through this gap into the chamber 322, in cooperation with the spring
  • the present invention is characterized by the transmission element 3, which is constructed telescopically.
  • a telescope arrangement consists of an outer part, in which an inner part is arranged coaxially and which can be displaced relative to the outer part in the direction of the common longitudinal axis of the two parts, as a result of which the overall length of the telescopic arrangement changes.
  • the space surrounding the outer and inner parts of the telescopic assembly forms the chamber in which the hydraulic medium is located, which can be pressurized to transmit force and movement.
  • the distance between the outer wall of the inner part and the inner wall of the outer part of the telescopic arrangement is dimensioned such that the connection with a throttling effect is produced between the chamber 322 acting as a pressure chamber and the compensation chamber 8. If there is a long pressure difference between the pressure chamber and the compensation chamber, the hydraulic medium between the outer part and the inner part of the telescopic arrangement can flow into or out of the pressure chamber. However, a rapid rise in pressure in the pressure chamber as a result of actuation of the actuator 2 cannot be compensated for, so that a force and therefore a movement can be transmitted via the increased pressure.
  • a preferred embodiment of the element according to the invention which is used in an injection valve for an internal combustion engine, consists of only three simply designed parts; the drive piston 31, which is firmly attached to the piezo Actuator 2 of the injection valve is attached, the receiving element 32, which is fixedly arranged on a valve tappet 4 for the servo valve or is integrally formed therewith, and the spring 33 between the drive piston and the receiving element.
  • Drive piston 31 and receiving element 32 form the inner part or outer part of a telescope arrangement.
  • the hydraulic function of this transmission element 3 is determined by the shape and the dimensioning of the drive piston and receiving element, in particular by the distance of the outer wall of the drive piston from the opposite inner wall of the receiving element and the degree of overlap of the drive piston and receiving element.
  • the cylindrical drive piston preferably dips a distance s into the cylindrical recess 322 in the receiving element 32.
  • End faces of drive piston 31 and receiving element 32 have axial cutouts which form chamber 321 for the hydraulic transmission medium.
  • the distance or gap between drive piston 31 and recess 321 is dimensioned such that when the periodic activation of the
  • the chamber can be filled with hydraulic medium to compensate for play if the total length of the arrangement changes.
  • the medium can flow out of the chamber. The compensation can take place at every work cycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un élément de transfert (3) compensateur de jeu placé entre le piézoactionneur (2) et l'élément soupape (5) d'une servo-valve d'une soupape d'injection (3). Cet élément comprend un piston d'entraînement (31) et un élément récepteur (32), lesquels coopèrent de façon télescopique et définissent une chambre (322) contenant un agent hydraulique. La fente située entre le piston d'entraînement (31) et l'élément récepteur (32) est dimensionnée de telle façon qu'une courte augmentation de pression dans la chambre (322) ne soit pas compensée mais que les différences de pression de plus longue durée soient supprimées.
PCT/DE1999/003818 1998-12-08 1999-12-01 Element de transfert d'un mouvement et soupape d'injection dote d'un tel element WO2000034645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19856617.4 1998-12-08
DE1998156617 DE19856617A1 (de) 1998-12-08 1998-12-08 Element zur Übertragung einer Bewegung und Einspritzventil mit einem solchen Element

Publications (1)

Publication Number Publication Date
WO2000034645A1 true WO2000034645A1 (fr) 2000-06-15

Family

ID=7890391

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/003818 WO2000034645A1 (fr) 1998-12-08 1999-12-01 Element de transfert d'un mouvement et soupape d'injection dote d'un tel element

Country Status (2)

Country Link
DE (1) DE19856617A1 (fr)
WO (1) WO2000034645A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012607C2 (de) * 2000-03-15 2002-01-10 Siemens Ag Verfahren zur Ansteuerung eines kapazitiven Stellgliedes
DE60125207T2 (de) 2000-10-11 2007-10-25 Siemens Vdo Automotive Corp., Auburn Hills Ausgleichsvorrichtung mit einem druckventil für einen festkörperaktor eines kraftstoffeinspritzventils
DE10055639A1 (de) * 2000-11-10 2002-05-23 Siemens Ag Injektor zum Einspritzen von Kraftstoff in einen Brennraum
EP1381772B1 (fr) 2000-11-13 2004-08-11 Siemens VDO Automotive Corporation Compensateur magnetique-hydraulique pour injecteur de carburant
US6749127B2 (en) 2002-02-11 2004-06-15 Siemens Vdo Automotive Corporation Method of filling fluid in a thermal compensator
DE10304458A1 (de) * 2003-02-04 2004-08-19 Siemens Ag Verfahren zum exakten Positionieren eines Bauteils in einer Stufenbohrung eines Gehäuses sowie Injektor für die Kraftstoffeinspritzung
DE10333696A1 (de) 2003-07-24 2005-02-24 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509858A (en) * 1968-05-20 1970-05-05 Gen Motors Corp Overhead cam valve lifter
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct
DE3742241A1 (de) * 1987-02-14 1988-08-25 Daimler Benz Ag Piezosteuerventil zur steuerung der kraftstoffeinspritzung ueber ein einspritzventil bei brennkraftmaschinen
DE19627982A1 (de) * 1996-07-11 1998-01-15 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement
DE19708304A1 (de) 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3418707A1 (de) * 1984-05-19 1985-10-24 Daimler-Benz Ag, 7000 Stuttgart Hydraulisches spielausgleichselement in einem ventiltrieb fuer brennkraftmaschinen
DE19500706C2 (de) * 1995-01-12 2003-09-25 Bosch Gmbh Robert Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen
DE19630443A1 (de) * 1996-07-27 1998-01-29 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509858A (en) * 1968-05-20 1970-05-05 Gen Motors Corp Overhead cam valve lifter
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct
DE3742241A1 (de) * 1987-02-14 1988-08-25 Daimler Benz Ag Piezosteuerventil zur steuerung der kraftstoffeinspritzung ueber ein einspritzventil bei brennkraftmaschinen
DE19627982A1 (de) * 1996-07-11 1998-01-15 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement
DE19708304A1 (de) 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung

Also Published As

Publication number Publication date
DE19856617A1 (de) 2000-06-21

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