EP1898083A1 - Injecteur pour une installation à injection de carburant - Google Patents

Injecteur pour une installation à injection de carburant Download PDF

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Publication number
EP1898083A1
EP1898083A1 EP07112013A EP07112013A EP1898083A1 EP 1898083 A1 EP1898083 A1 EP 1898083A1 EP 07112013 A EP07112013 A EP 07112013A EP 07112013 A EP07112013 A EP 07112013A EP 1898083 A1 EP1898083 A1 EP 1898083A1
Authority
EP
European Patent Office
Prior art keywords
hollow piston
injector
chamber
injector according
coupler
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
EP07112013A
Other languages
German (de)
English (en)
Other versions
EP1898083B1 (fr
Inventor
Cetin Irmak
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1898083A1 publication Critical patent/EP1898083A1/fr
Application granted granted Critical
Publication of EP1898083B1 publication Critical patent/EP1898083B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/06—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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to an injector for a fuel injection system of an internal combustion engine, in particular in a motor vehicle.
  • Injectors for fuel injection systems have long been known, for example from the DE 10 2004 005 452 A1 and usually comprise an injector body in which a nozzle needle for controlling an injection of fuel by means of at least one spray hole is mounted adjustable in stroke.
  • the injector body includes a piezoelectric actuator for controlling the pressure in a coupler space, wherein the nozzle needle has a control surface which limits a hydraulically coupled to the coupler chamber control space.
  • the piezoelectric actuator is drivingly connected to a coupler piston, on which a coupler sleeve is mounted adjustable in stroke.
  • the coupler sleeve is axially supported by means of a compression spring supported on the piezoelectric actuator against an intermediate plate, which axially delimits on the one hand the coupler chamber and on the other hand the control chamber and through which the coupler chamber is hydraulically coupled to the control chamber.
  • the injector of the piezoelectric actuator is operated inversely, ie, to close the nozzle needle, the injector is energized while it is de-energized to open the nozzle needle.
  • the injector In the ejection of the injector shortens its axial length, thereby pulling the coupler piston away from the intermediate plate and the volume of the coupler room enlarged.
  • the pressure drop occurring therein propagates into the control chamber and leads to an opening stroke of the nozzle needle.
  • the injector according to the invention with the features of claim 1 has the advantage that it is not operated inversely, but that opens the nozzle needle during energization of the piezoelectric actuator, while it closes during the Entströming of the piezoelectric actuator.
  • a Injektorpiano in which in a needle portion a nozzle needle for controlling an injection of fuel by at least one spray hole is mounted adjustable in stroke, a hollow piston mounted adjustable stroke, which with its, the at least one spray hole facing annular end side also axially annular coupler space axially limited.
  • a rod-shaped piezoelectric actuator for controlling the pressure in the coupler space is arranged coaxially in the hollow piston, which is supported on the one hand at a bottom of the hollow piston and on the other hand directly or indirectly on the injector body.
  • A limited by a control surface of the nozzle needle control chamber is hydraulically connected to the coupler so that propagates a pressure change in the coupler space in the control chamber and causes an opening or closing movement of the nozzle needle.
  • the piezoelectric actuator When the piezoelectric actuator is energized, it is extended and pushes the hollow piston away from the nozzle needle, which reduces the pressure in the coupling space. This pressure reduction causes by the hydraulic coupling with the control chamber, a pressure reduction in the control chamber and thereby an opening stroke of the nozzle needle.
  • a spring device When the piezoelectric actuator is de-energized, a spring device ensures that the hollow piston returns to its original position, which increases the pressure in the coupler chamber and thereby the pressure in the control chamber.
  • the pressure increase in the control chamber causes the closing movement of the nozzle needle. Due to the novel arrangement of the piezoelectric actuator thus a positive stroke of the piezoelectric actuator is required to open the nozzle needle, whereby the piezoelectric actuator is in the main time in the de-energized state. This significantly increases its durability, which can increase the longevity of the injector according to the invention.
  • the hollow piston is biased by a spring device in the direction of the nozzle needle.
  • the spring device may be formed in the manner of a coil spring / tube spring and on the one hand on the hollow piston and on the other hand on a, the Support needle section facing away from the end of the injector.
  • Such spring devices can be produced with high precision and cost, which can reduce the total cost of production.
  • the spring device is arranged protected within the injector body and thereby housed wear.
  • a piston guide designed as a separate component is provided in the actuator section in the radial direction between the injector body and the hollow piston.
  • the separate piston guide facilitates the assembly of the injector according to the invention and thereby helps to reduce assembly costs.
  • the piston guide designed as a separate component can be arranged after the arrangement of the hollow piston and the piezoelectric actuator in the injector body of the injector and serves at the same time for centering the hollow piston with respect to the injector body.
  • a potting compound is introduced between a lateral surface of the rod-shaped piezoelectric actuator and an inner wall of the hollow piston.
  • the potting compound may consist of an elastic material which allows a relative movement between the piezoelectric actuator and the hollow piston.
  • the potting compound is preferably fuel-resistant, which means that no impairment due to dissolution of the potting compound is to be feared, even over a prolonged period of operation.
  • an injector 1 according to the invention for an otherwise not shown fuel injection system of an internal combustion engine comprises an injector body 2, which in the present case is assembled from an actuator section 3 and a needle section 4.
  • the actuator section 3 with the needle section 4 via a connecting means for example in the manner of a union nut, are interconnected.
  • the injector body 2 has a stroke-adjustable nozzle needle 5 for controlling an injection of fuel through at least one spray hole 6.
  • the nozzle needle 5 may in principle be a single, ie one-piece nozzle needle 5 or a needle assembly.
  • the fuel is injected through the at least one injection hole 6 in a combustion chamber, not shown, of the internal combustion engine.
  • the internal combustion engine is located in a motor vehicle.
  • the injector 1 has a reciprocally displaceable hollow piston 7 which, with its annular end face facing the at least one injection hole 6, axially delimits an annular coupler space 8.
  • a rod-shaped actuator 9, in particular a piezoelectric actuator for controlling the pressure in the coupler space 8 is arranged.
  • the actuator 9 thereby changes its axial longitudinal extent between its activated, ie energized state and its inactivated, ie de-energized state. In the activated state, the piezoelectric actuator 9 is extended.
  • the piezoelectric actuator 9 is arranged between a base 10 of the hollow piston 7 and an intermediate plate 11, wherein it is supported on the bottom 10 and also on the intermediate plate 11.
  • the intermediate plate 11 can be seen purely by way of example, so that the actuator 9 is supported either indirectly via the intermediate plate 11 or directly on the injector body 2.
  • the coupler space 8 is bounded axially by the end face of the hollow piston 7 and by the intermediate plate 11 and radially by the actuator 9 and a piston guide 12.
  • the piston guide 12 can be formed either in one piece with the injector body 2 or as a separate component, in particular as a guide sleeve.
  • a control chamber 13 is arranged between the latter and the nozzle needle 5, which is limited in the axial direction of the intermediate plate 11 and a control surface of the nozzle needle 5.
  • the control chamber 13 is now hydraulically connected to the coupler space 8, which can take place, for example, via a coupling path 14 that traverses the intermediate plate 11.
  • a spring device 15 On a side facing away from the intermediate plate 11 of the hollow piston 7, a spring device 15 is provided, which biases the hollow piston 7 in the direction of the nozzle needle 5.
  • the spring device 15 is, like the hollow piston 7, arranged in a pressure chamber 16 within the injector body 2.
  • a system pressure in particular a rail pressure.
  • This system pressure is generated, for example, by an external pressure accumulator (not shown) or an external pressure source.
  • the spring device 15 is formed as a conventional coil spring or as a spring sleeve and thereby structurally simple and inexpensive to manufacture. As can be seen from FIG. 2, the spring device 15 can thereby be supported on a projection 21 on the hollow piston 7 and is thus fixed in position on the hollow piston 7.
  • an electrical connection 17 is provided, which is guided through the bottom 10 of the hollow piston 7 and further through the spring device 15.
  • the piston guide 12 has at least one axial coupling path 14 'connected at one end to a pressure chamber 16 connected to the pressure source in the actuator section 3 or a pressure source and at the other end to one with which at least a spray hole 6 communicating nozzle chamber 18 in the needle section 4 is hydraulically connected.
  • at least one hydraulic path 19 is provided between the hollow piston 7 and the piston guide 12, via which the coupler space 8 can communicate with the pressure chamber 16 formed in the actuator section 3.
  • a space between a lateral surface of the piezoelectric actuator 9 and an inner wall of the hollow piston 7 is filled with a potting compound, which reliably prevents penetration of fuel into the annular gap between the piezoelectric actuator 9 and hollow piston 7.
  • the adjustment movement of the hollow piston 7 causes no or only a slight increase in pressure in the pressure chamber 16, which communicates via the coupling path 14 'with the nozzle chamber 18.
  • the piezoactuator 9 is deactivated, i. escapes, whereupon this contracts and the spring means 15 causes a provision of the hollow piston 7 in its initial position.
  • the pressure in the coupler chamber 8 and thus increases in the control chamber 13, whereupon the nozzle needle 5 moves in its closed position.
  • system pressure is again present in all rooms.
  • a compensation of any pressure differences between the coupler space 8 and the pressure chamber 16 can be effected via the hydraulic path 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20070112013 2006-09-01 2007-07-09 Injecteur pour une installation à injection de carburant Not-in-force EP1898083B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610041073 DE102006041073A1 (de) 2006-09-01 2006-09-01 Injektor für eine Kraftstoffeinspritzanlage

Publications (2)

Publication Number Publication Date
EP1898083A1 true EP1898083A1 (fr) 2008-03-12
EP1898083B1 EP1898083B1 (fr) 2010-05-12

Family

ID=38779708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070112013 Not-in-force EP1898083B1 (fr) 2006-09-01 2007-07-09 Injecteur pour une installation à injection de carburant

Country Status (2)

Country Link
EP (1) EP1898083B1 (fr)
DE (2) DE102006041073A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306073C1 (de) * 1993-02-26 1994-06-01 Siemens Ag Zumeßvorrichtung für Fluide
WO2005075811A1 (fr) * 2004-02-04 2005-08-18 Robert Bosch Gmbh Injecteur de carburant avec obturateur d'injection a commande directe
EP1571328A2 (fr) * 2004-03-02 2005-09-07 Siemens Aktiengesellschaft Soupape d'injection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306073C1 (de) * 1993-02-26 1994-06-01 Siemens Ag Zumeßvorrichtung für Fluide
WO2005075811A1 (fr) * 2004-02-04 2005-08-18 Robert Bosch Gmbh Injecteur de carburant avec obturateur d'injection a commande directe
EP1571328A2 (fr) * 2004-03-02 2005-09-07 Siemens Aktiengesellschaft Soupape d'injection

Also Published As

Publication number Publication date
EP1898083B1 (fr) 2010-05-12
DE502007003705D1 (de) 2010-06-24
DE102006041073A1 (de) 2008-03-06

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