EP2003327A1 - Aktuatoreinheit für ein Einspritzventil und Einspritzventil - Google Patents

Aktuatoreinheit für ein Einspritzventil und Einspritzventil Download PDF

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Publication number
EP2003327A1
EP2003327A1 EP07011598A EP07011598A EP2003327A1 EP 2003327 A1 EP2003327 A1 EP 2003327A1 EP 07011598 A EP07011598 A EP 07011598A EP 07011598 A EP07011598 A EP 07011598A EP 2003327 A1 EP2003327 A1 EP 2003327A1
Authority
EP
European Patent Office
Prior art keywords
piezo actuator
top cap
injection valve
adapter
actuator
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.)
Withdrawn
Application number
EP07011598A
Other languages
English (en)
French (fr)
Inventor
Valerio Polidori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP07011598A priority Critical patent/EP2003327A1/de
Publication of EP2003327A1 publication Critical patent/EP2003327A1/de
Withdrawn legal-status Critical Current

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to an actuator unit for an injection valve and an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • Injection valves for an internal combustion engine comprise actuator units.
  • the actuator unit In order to inject fuel, the actuator unit is energized so that a fluid flow through the fluid outlet portion of the injection valve is enabled.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example the range of up to 200 bar or in the case of diesel engines in the range of up to 2,000 bar.
  • the injection of fluids under such high pressures has to be carried out very precisely.
  • the fast changes of the pressure may cause pressure waves in the fluid which leads to pressure waves in different parts of the injector, in particular in the actuator unit.
  • the object of the invention is to create an actuator unit that is simply to be manufactured and which facilitates a reliable and precise actuation of the injection valve.
  • an actuator unit for an injection valve comprising a piezo actuator with a longitudinal axis, the piezo actuator having an electric pin being electrically coupable to a power supply, a top cap being a part of a piezo actuator housing, the piezo actuator being arrangeable in the piezo actuator housing, and an adapter with a supporting element and terminal elements being rigidly coupled to the supporting element, at least one of the terminal elements being electrically coupled to the electric pin of the piezo actuator and at least one of the terminal elements being electrically coupable to the power supply, wherein the adapter is rigidly coupled to the top cap.
  • the supporting element is formed as an injection moulded part.
  • the adapter and the top cap of the piezo actuator housing are forming a positive-fit coupling. This has the advantage that a good force transmission between the adapter and the top cap of the piezo actuator housing is possible.
  • the top cap of the piezo actuator housing comprises a channel, the channel extending perpendicular to the longitudinal axis and being designed as a going-through channel.
  • the invention is distinguished by an injection valve comprising the actuator unit of the first aspect of the invention, with the actuator unit being designed for acting on the valve assembly.
  • An injection valve 10 ( figure 1 ) that is used as a fuel injection valve for an internal combustion engine, comprises a valve assembly 60, an actuator unit 14 and a connector 56.
  • the injection valve 10 has a housing 12 with a tubular shape which has a central longitudinal axis A.
  • the housing 12 of the injection valve 10 comprises a cavity 24 which is axially led through the housing 12.
  • the actuator unit 14 is inserted into the cavity 24 of the housing 12 and comprises a piezo actuator 16, which changes its axial length depending on a control signal applied to it.
  • a piezo actuator housing 17 encloses the piezo actuator 16 so that the piezo actuator 16 is stored in a mechanical robust manner.
  • the valve assembly 60 comprises a valve body 20 and a part of the cavity 24 which is axially led through the valve body 20.
  • a fluid outlet portion 28 is formed which is closed or open depending on the axial position of a valve needle 22.
  • the injection valve 10 has a fluid inlet portion 26 which is arranged in the housing 12 and which is hydraulically coupled to the cavity 24 and a not shown fuel connector.
  • the fuel connector is designed to be connected to a high pressure fuel chamber of an internal combustion engine, the fuel is stored under high pressure, for example, under the pressure above 200 bar.
  • the valve body 20 has a valve body spring rest 32 and the valve needle 22 comprises a valve needle spring rest 34, both spring rests 32, 34 supporting a spring 30 arranged between the valve body 20 and the valve needle 22.
  • the injection valve 10 is of an outward opening type. In an alternative embodiment of the injection valve 10 it may be of an inward opening type.
  • a bellow 36 is arranged which is sealingly coupling the valve body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a chamber 38 is prevented.
  • the bellow 36 is formed and arranged in a way that the valve needle 22 is actuable by the actuator unit 14.
  • FIG. 2 shows a detailed view of the actuator unit 14.
  • the piezo actuator housing 17 enclosing the piezo actuator 16 comprises a top cap 42.
  • the top cap 42 of the piezo actuator housing 17 is arranged at an end of the piezo actuator 16 facing away from the valve assembly 60.
  • the actuator unit 14 further comprises a piston 46.
  • a thermal compensator unit 40 is arranged in the cavity 24 of the housing 12 and is mechanically coupled to the piston 46 of the piezo actuator 16.
  • the thermal compensation unit 40 enables to set an axial preload force on the actuator unit 14 via the piston 46 to compensate changes of the fluid flow through the fluid outlet portion 44 in the case of temperature changes of the injection valve 10.
  • the piezo actuator 16 further comprises an electric pin 44 to supply the piezo actuator 16 with electric energy.
  • the piezo actuator 16 changes its length in axial direction depending on electric energy supplied to it. By changing its length the piezo actuator 16 can exert a force to the valve needle 22. The force from the piezo actuator 16 being exerted to the valve needle 22 in an axial direction allows or prevents a fluid flow through the fluid outlet portion 28.
  • the injection valve 10 further comprises the connector 56 with a non-conductive connector body 57 in which an electric conductor 58 is arranged. Electric energy can be supplied to the electric conductor 58 of the connector 56.
  • the actuator unit 40 comprises an adapter 47 consisting of a supporting element 48 and terminal elements 49 which are rigidly coupled to the supporting element 48.
  • the supporting element 48 consists of plastic or another non-conductive material.
  • the electric conductor 58 of the connector 56 is electrically coupled to one of the terminal elements 49 of the adapter 47 which is electrically coupled to another of the terminal elements 49 which on its part is electrically coupled to the electric pin 44 of the piezo actuator 60. Consequently, electric energy can be simply supplied to the piezo actuator 16 via the connector 56.
  • Figure 3a shows the top cap 42 of the piezo actuator housing 17 with grooves 62 perpendicular to the longitudinal axis A. Furthermore, the top cap 42 of the piezo actuator housing 17 comprises a channel 43 arranged perpendicular to the longitudinal axis A and perpendicular to the grooves 62. The channel 43 is designed as a going-through channel.
  • Figure 3b shows the top cap 42 of the piezo actuator housing 17 and the adapter 47 wherein the adapter 47 is rigidly coupled to the top cap 42 of the piezo actuator housing 17.
  • the adapter 47 is coupled to the top cap 42 of the piezo actuator housing 17 by a molding process.
  • the channel 43 which is designed as a going-through channel supports a homogenous distribution of material during the molding process, in particular in the case of an injection molding process.
  • One of the grooves 62 of the top cap 42 of the piezo actuator housing 17 and one of tongues 64 of the molded part are forming a positive-fit coupling which allows a rigid coupling between the adapter 47 to the top cap 42.
  • a good force transmission between the supporting element 48 of the adapter 47 and the top cap 42 of the piezo injector housing 17 is enabled.
  • the fluid is led from the fluid inlet portion 26 through the housing 12 to the fluid outlet portion 28.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the valve body 20 in a closing position of the valve needle 22. Outside of the closing position of the valve needle 22, the valve needle 22 enables the fluid flow through the fluid outlet portion 28.
  • the piezo actuator 16 may change its axial length if it is energized. By changing its length the piezo actuator 16 may exert a force on the valve needle 22.
  • the valve needle 22 is able to move in axial direction out of the closing position. Outside the closing position of the valve needle 22 there is a gap between the valve body 20 and the valve needle 22 at an axial end of the injection valve 10 facing away from the piezo actuator 16.
  • the spring 30 can force the valve needle 22 via the valve needle spring rest 34 towards the piezo actuator 16. In the case the piezo actuator 16 is de-energized the piezo actuator 16 shortens its length.
  • the spring 30 can force the valve needle 22 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 22 caused by the piezo actuator 16 and the force on the valve needle 22 caused by the spring 30 whether the valve needle 22 is in its closing position or not.
  • the piezo actuator 16 If the piezo actuator 16 is energized vibrations can occur at the top cap 42 of the piezo actuator housing 17.
  • the adapter 47 By rigidly coupling the adapter 47 to the top cap 42 of the piezo actuator housing 17 the forces caused by the vibrations can be transmitted directly from the top cap 42 of the piezo actuator housing 17 to the adapter 47. Consequently, it is possible to avoid a transfer of mechanical forces between the terminal elements 49 of the adapter 47 and the electric pins 44 of the piezo actuator 16. Thus, a damage or a destruction of one of the terminal elements 49 of the adapter 47 or one of the electric pins 44 of the piezo actuator 16 due to high mechanical forces can be prevented.

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)
EP07011598A 2007-06-13 2007-06-13 Aktuatoreinheit für ein Einspritzventil und Einspritzventil Withdrawn EP2003327A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07011598A EP2003327A1 (de) 2007-06-13 2007-06-13 Aktuatoreinheit für ein Einspritzventil und Einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07011598A EP2003327A1 (de) 2007-06-13 2007-06-13 Aktuatoreinheit für ein Einspritzventil und Einspritzventil

Publications (1)

Publication Number Publication Date
EP2003327A1 true EP2003327A1 (de) 2008-12-17

Family

ID=38537637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07011598A Withdrawn EP2003327A1 (de) 2007-06-13 2007-06-13 Aktuatoreinheit für ein Einspritzventil und Einspritzventil

Country Status (1)

Country Link
EP (1) EP2003327A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2299101A1 (de) * 2009-09-17 2011-03-23 Robert Bosch GmbH Magnetventil mit direkt kontaktierter Steuereinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059177A1 (de) * 2000-11-29 2002-06-13 Siemens Ag Anordnung mit einem ersten Element und einem damit verbundenen zweiten Element, die insbesondere zum Einsatz in einem Kraftstoffeinspritzventil geeignet ist, und Verfahren zu deren Herstellung
WO2003069152A1 (de) 2002-02-13 2003-08-21 Siemens Aktiengesellschaft Dichtungselement für den piezoaktor eines kraftstoff-einspritzventils
DE102005042759A1 (de) 2004-09-09 2006-04-13 Denso Corp., Kariya Piezoelektrischer Aktor
DE102004063293A1 (de) 2004-12-29 2006-07-13 Siemens Ag Kraftstoffinjektor für eine Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059177A1 (de) * 2000-11-29 2002-06-13 Siemens Ag Anordnung mit einem ersten Element und einem damit verbundenen zweiten Element, die insbesondere zum Einsatz in einem Kraftstoffeinspritzventil geeignet ist, und Verfahren zu deren Herstellung
WO2003069152A1 (de) 2002-02-13 2003-08-21 Siemens Aktiengesellschaft Dichtungselement für den piezoaktor eines kraftstoff-einspritzventils
DE102005042759A1 (de) 2004-09-09 2006-04-13 Denso Corp., Kariya Piezoelektrischer Aktor
DE102004063293A1 (de) 2004-12-29 2006-07-13 Siemens Ag Kraftstoffinjektor für eine Brennkraftmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2299101A1 (de) * 2009-09-17 2011-03-23 Robert Bosch GmbH Magnetventil mit direkt kontaktierter Steuereinheit

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