EP1493917A1 - Zusammenbau eines Injektors - Google Patents

Zusammenbau eines Injektors Download PDF

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Publication number
EP1493917A1
EP1493917A1 EP03012438A EP03012438A EP1493917A1 EP 1493917 A1 EP1493917 A1 EP 1493917A1 EP 03012438 A EP03012438 A EP 03012438A EP 03012438 A EP03012438 A EP 03012438A EP 1493917 A1 EP1493917 A1 EP 1493917A1
Authority
EP
European Patent Office
Prior art keywords
housing
module
modules
injector unit
valve
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
Application number
EP03012438A
Other languages
English (en)
French (fr)
Other versions
EP1493917B1 (de
Inventor
Angelo D'arrigo
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 Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to DE2003604569 priority Critical patent/DE60304569T2/de
Priority to EP20030012438 priority patent/EP1493917B1/de
Priority to PCT/EP2004/050942 priority patent/WO2004106727A1/en
Publication of EP1493917A1 publication Critical patent/EP1493917A1/de
Application granted granted Critical
Publication of EP1493917B1 publication Critical patent/EP1493917B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • 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

Definitions

  • the present invention refers to a piezoelectric injector unit, in particular for injecting fuel into a vehicle engine, comprising a housing containing a valve needle for opening and closing a valve orifice and a metering opening, respectively and a piezoelectrically driven actuator element for actuating the valve needle according to an electrical control voltage.
  • the present invention refers to a method of producing a piezoelectric injector unit.
  • Piezoelectric injector units comprising a piezoelectric assembly for actuating a valve assembly are commonly used in modern motor vehicles for controlling the injection of fuel in to the vehicle engine.
  • the injection of fuel in to the vehicle engine can be performed fast and with high precision by means of a piezoelectric element moving a piston element, that is actuating a valve needle, which in turn opens and closes a metering opening accordingly.
  • So far injector units have been considered as individual elements designed for a certain purpose and configured according to certain parameters.
  • EP 95 912 885 A1 discloses a typical injector unit according to prior art. Different and very individually shaped sections of outer and inner, movable and fixed elements have to be assembled and sealed to make up the total unit.
  • the main disadvantage of this prior art is that only the whole device, i.e. the injector unit as such can be tested for its functional quality. If its overall performance is unsatisfying, either the whole unit has to be discarded or every single one of its elements has to be exchanged one by one to find the error, each time necessitating a complete disassembling and reassembling of the whole unit, thereby adding further error sources.
  • EP 1 046 809 A2 discloses an injection unit with a one piece housing, in which the single elements like the valve needle, different springs, seals, abutment elements etc. have to positioned and fixed. The assembling is, thus, very cumbersome and expensive. Also, the housing containing a separate fuel supply channel within its housing is difficult to machine. Further, the metering opening, which is a high precision element, is configured as an opening in the housing. Consequently, the whole housing has to be machined with high precision, increasing the costs. Finally the disadvantages concerning the testing of the unit as mentioned earlier apply here, too.
  • the injector assembly according to the present invention improves an injector assembly according to the prior art by the valve needle and the metering opening being part of a functionally independent valve module; the actuator element being part of a functionally independent piezoelectric actuator module; and both modules being - preferably reversibly - inserted into the rigid housing.
  • the injector unit is no longer considered as an individual device for an overall performance, but is subdivided in accordance to its different subfunctions.
  • Each subfunction is represented by a module of its own, which is configured as a functionally independent assembly.
  • Each independent assembly can be produced and tested individually before insertion into the housing.
  • errors can be detected in an early stage. Discarding an unsatisfying module is relatively cheap and does not involve disassembling and reassembling of the whole unit.
  • the rigid housing can be machined in quite a simple and unsophisticated way, reducing the overall cost substantially.
  • thermal compensator means for compensating thermal expansion of the piezoelectric actuator module, the thermal compensator means being configured as a functionally independent thermal compensator module and being inserted into the housing together with the piezoelectric actuator module and the valve module.
  • piezoelectric actuator assemblies known comprising integrated thermal compensation means, it is a consistent continuation of the basic idea of the present invention to subdivide such combination unit into different units with particular tasks, namely an actuator unit and a compensator unit, yielding analogue advantages as explained above.
  • a further preferred embodiment is characterized by the housing having a partially cylindrically shaped interior, the modules having a partially cylindrically shaped exterior, and the inner cylinder diameter of the housing corresponding to the outer cylinder diameter of the modules.
  • the injector unit according to the present invention is provided with a housing having an adjustable cap, by means of which the modules inserted in the housing may be pressed together by an adjustable force.
  • a housing having an adjustable cap by means of which the modules inserted in the housing may be pressed together by an adjustable force. This corresponds to an easy way of calibrating the injector unit providing a bias force to the piezoelectric element.
  • the injector unit according to the present invention is provided with a valve module comprising a connection port to a fuel supply tube. This has the effect that the fuel does not flood the whole housing, but only the valve module. Thus, only the valve module has to be sealed, which facilitates the machining of the housing even further.
  • the housing is comprising a longitudinal slit, in which the supply tube connected to the valve module is sliding during insertion of the valve module into the housing.
  • the housing is provided with an opening, through which a terminal connector may be connected to the piezoelectric actuator module after its insertion into the housing. It is necessary to have at least one electrical supply line fed through the housing in order to supply the piezoelectric module with the control voltage. As an electrical connection is not difficult to fit and does not involve serious error sources, this connection can be provided after the mechanical assembly of the injector unit. Thus a simple hole through the housing's wall can be appropriate.
  • the method of production according to the present invention is comprising the steps of
  • the main advantages of this method have been explained above in the context of the injector unit according to the present invention.
  • the method allows for an optimised production of the separate modules and an easy assembly even by unskilled workers or simple machines.
  • the modules can be produced in high production numbers, thus lowering the price for every single module. Also changes in parameters, that are necessary for meeting the requirements of different engines do not change the assembly and calibration of the total unit.
  • a preferred embodiment of the present invention comprises the further step of providing and inserting into the housing a functionally independent thermal compensator module.
  • each module is tested independently before inserting it into the housing. Thus, when a failure of a module is detected, this module can be repaired or exchanged without having to disassemble the whole unit. If, however, the total unit is not working satisfactory, the reason must be found in a defect housing or an erroneous step of assembly.
  • valve module in an advantageous variation of the method according to the present invention there is provided the further step of connecting the valve module to a fuel supply tube prior to inserting it into the housing.
  • the fuel supply tube is sliding in a longitudinal slit when inserting the valve module into the housing.
  • Fig. 1 illustrates three different views of a housing 10 according to the invention.
  • Fig. 1a illustrates a side view of the housing 10
  • Fig. 1b illustrates a longitudinal view of the housing 10
  • Fig. 1c illustrates another side view of the housing 10 from an opposite side with respect to Fig. 1a.
  • the housing 10 is provided with a substantially cylindrical inner surface 11 representing a cavity open at both ends into which correspondingly cylindrical elements can easily and reversibly be inserted from one side (left side in Fig. 1b).
  • a shoulder 12 acting as an abutment member for items inserted into the housing 10.
  • the housing 10 is provided with a longitudinal slit 13 cut into the housing's 10 wall. This slit is used, as explained further below, as a slideway for the valve module and the connected fuel tube. At one end of the housing 10 (left end in Fig. 1c) the slit 13 is open to allow the insertion of modules.
  • a hole 14 Opposite to the slit 13 there is provided a hole 14, through which an electrical terminal connector can be inserted.
  • the hole 14 is surrounded by the housing's 10 wall at all sides.
  • the hole 14 can also be configured as a slit.
  • Fig. 2 illustrates three modules 20, 30, 40 ready for assembly.
  • Module 20 is a piezoelectric actuator module comprising a piezoelectric element, which is used to move a piston element (both elements not explicitly shown in Fig. 2) depending on an electrical control voltage supplied thereto.
  • the piston element When assembled and actuated the piston element acts onto a movable acting element of the valve module 30.
  • the acting element can be the valve needle 32 of the valve module 30 or any other linking element.
  • the valve element 30 is configured such, that, upon actuation by the actuator module 20, the valve needle 32 is moved to open and close the metering opening 31 according to the control voltage supplied to the actuator module 20.
  • the valve module 30 may be connected to a fuel reservoir or pump by means of the fuel tube 33 and a tube connector 34, the opening and closing of the metering opening 31 yield a well metered injection of fuel to a vehicle engine.
  • thermal compensation module 40 for compensating thermal expansion of the piezoelectric element in the actuator module 20.
  • an actuator module is chosen such that the piezoelectric element is internally compensated, no compensation module 40 is necessary.
  • Fig. 3 illustrates an exploded view of the injector unit according to the invention featuring the elements of Fig. 3 together with the housing 10 of Fig. 1.
  • the valve assembly is inserted into the housing, while the fuel tube is sliding in the slit 13.
  • the outer shape of the valve module 30 is chosen such that a cylindrical part with a diameter corresponding to the inner diameter of the housing 10 is kept in slight contact to walls of the housing 10 and is abutted by the shoulder 12.
  • the front part of the valve module 30, however, is fed through the opening of the housing 10 and represents the tip of the total injector unit.
  • the actuator module 20 and the thermal compensation module 40 are inserted similarly into the housing 10.
  • the insertion end of the housing 10 (left end in Fig. 3) is closed by an adjustable cap, in particular by a ring nut 15.
  • the ring nut 15 can also be used to calibrate the injection unit by adjusting the force by which the modules 20, 30, 40 are pressed together inside the housing, thus, adjusting the biasing force applied to the piezoelectric element of the actuator module 10.
  • an electrical terminal connector 21 can be coupled to the module 20 through the hole 14 in the housing's 10 wall.
  • Fig. 4 illustrates an assembled injector unit according to the invention.

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)
EP20030012438 2003-05-30 2003-05-30 Zusammenbau eines Injektors Expired - Fee Related EP1493917B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2003604569 DE60304569T2 (de) 2003-05-30 2003-05-30 Zusammenbau eines Injektors
EP20030012438 EP1493917B1 (de) 2003-05-30 2003-05-30 Zusammenbau eines Injektors
PCT/EP2004/050942 WO2004106727A1 (en) 2003-05-30 2004-05-27 Injector assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030012438 EP1493917B1 (de) 2003-05-30 2003-05-30 Zusammenbau eines Injektors

Publications (2)

Publication Number Publication Date
EP1493917A1 true EP1493917A1 (de) 2005-01-05
EP1493917B1 EP1493917B1 (de) 2006-04-12

Family

ID=33427060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030012438 Expired - Fee Related EP1493917B1 (de) 2003-05-30 2003-05-30 Zusammenbau eines Injektors

Country Status (3)

Country Link
EP (1) EP1493917B1 (de)
DE (1) DE60304569T2 (de)
WO (1) WO2004106727A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008040796A1 (de) * 2006-10-06 2008-04-10 Continental Automotive Gmbh Verfahren zum herstellen eines injektors und injektor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021652A1 (de) 2004-05-03 2005-12-01 Siemens Ag Verfahren zum Herstellen eines Injektors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043666A1 (en) * 1999-01-19 2000-07-27 Siemens Automotive Corporation Modular two part fuel injector
WO2001055578A2 (de) * 2000-01-28 2001-08-02 Robert Bosch Gmbh Einspritzdüse
DE10055644A1 (de) * 2000-11-10 2002-05-23 Siemens Ag Verfahren zum Einstellen eines Leerhubs eines Injektors, wobei der Leerhub durch eine Aktoreinheit mit einem elektrisch ansteuerbaren Aktor und einen vom Aktor betätigten Ventilkolben gebildet wird
EP1219821A1 (de) * 2000-12-29 2002-07-03 Siemens VDO Automotive Corporation Modulares Brennstoffeinspritzventil mit einem integrierten oder austauschbaren Einlassrohr, einem integrierten Filter und einer Justiereinrichtung
DE10133218A1 (de) * 2001-07-09 2003-01-30 Bosch Gmbh Robert Verfahren und Vorrichtung zur Einstellung des Magnethubes an Kraftstoffinjektoren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022166A (en) * 1975-04-03 1977-05-10 Teledyne Industries, Inc. Piezoelectric fuel injector valve
DE19519192C1 (de) * 1995-05-24 1996-06-05 Siemens Ag Einspritzventil
DE19631280A1 (de) * 1996-08-02 1998-02-05 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zur Herstellung
JP4243430B2 (ja) * 1998-06-18 2009-03-25 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射弁
US6687997B2 (en) * 2001-03-30 2004-02-10 Siemens Automotive Corporation Method of fabricating and testing a modular fuel injector
US6766965B2 (en) * 2001-08-31 2004-07-27 Siemens Automotive Corporation Twin tube hydraulic compensator for a fuel injector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043666A1 (en) * 1999-01-19 2000-07-27 Siemens Automotive Corporation Modular two part fuel injector
WO2001055578A2 (de) * 2000-01-28 2001-08-02 Robert Bosch Gmbh Einspritzdüse
DE10055644A1 (de) * 2000-11-10 2002-05-23 Siemens Ag Verfahren zum Einstellen eines Leerhubs eines Injektors, wobei der Leerhub durch eine Aktoreinheit mit einem elektrisch ansteuerbaren Aktor und einen vom Aktor betätigten Ventilkolben gebildet wird
EP1219821A1 (de) * 2000-12-29 2002-07-03 Siemens VDO Automotive Corporation Modulares Brennstoffeinspritzventil mit einem integrierten oder austauschbaren Einlassrohr, einem integrierten Filter und einer Justiereinrichtung
DE10133218A1 (de) * 2001-07-09 2003-01-30 Bosch Gmbh Robert Verfahren und Vorrichtung zur Einstellung des Magnethubes an Kraftstoffinjektoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008040796A1 (de) * 2006-10-06 2008-04-10 Continental Automotive Gmbh Verfahren zum herstellen eines injektors und injektor

Also Published As

Publication number Publication date
DE60304569D1 (de) 2006-05-24
EP1493917B1 (de) 2006-04-12
WO2004106727A1 (en) 2004-12-09
DE60304569T2 (de) 2006-09-14

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