EP2596231B1 - Injecteur de carburant doté d'un ensemble coupleur hydraulique - Google Patents

Injecteur de carburant doté d'un ensemble coupleur hydraulique Download PDF

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Publication number
EP2596231B1
EP2596231B1 EP11724414.5A EP11724414A EP2596231B1 EP 2596231 B1 EP2596231 B1 EP 2596231B1 EP 11724414 A EP11724414 A EP 11724414A EP 2596231 B1 EP2596231 B1 EP 2596231B1
Authority
EP
European Patent Office
Prior art keywords
coupler
piston
valve piston
fuel injector
section
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.)
Not-in-force
Application number
EP11724414.5A
Other languages
German (de)
English (en)
Other versions
EP2596231A1 (fr
Inventor
Holger Rapp
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 EP2596231A1 publication Critical patent/EP2596231A1/fr
Application granted granted Critical
Publication of EP2596231B1 publication Critical patent/EP2596231B1/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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injector with a hydraulic coupler unit according to the preamble of claim 1.
  • a fuel injector in which, inter alia, a hydraulic coupler unit is arranged in an injector housing.
  • the hydraulic coupler unit comprises a coupler body, in which a coupler piston and a valve piston are each guided axially displaceably, wherein both components define between them a fuel space filled with fuel, which forms a so-called coupler gap volume.
  • the coupler piston is in communication with an actuator element whose operation causes a translational movement of the coupler piston in the direction of the pressure chamber against a biasing spring, which is arranged coaxially outside the coupler body and on the one hand a return movement of the coupler piston after the operation and on the other a necessary bias Actuator ensured.
  • the overall length of the hydraulic coupler unit is essentially determined by the sum of the lengths of the valve piston and the coupler piston, ie from the lengths of the pistons guided in the coupler body. Furthermore, upon pressurization of the coupler gap, a widening of the guide clearance or of the guide gap occurs both on the coupler piston and on the valve piston.
  • a disadvantage of this technical solution is that the sleeve-shaped part of the coupler between coupler piston and valve piston at the required in the fuel injector ratios a very small wall thickness of less than 1 mm, which at the same time there is a requirement, the coupler piston on the lateral surface and the valve piston on the inner bore to lead with little play. This places increased demands on the production technology in the production of the coupler unit.
  • a generic coupler unit is from the DE-A-10145620 known.
  • Object of the present invention is to provide a coupler unit, on the one hand has the same functional advantages, but on the other hand allows the execution of the components with larger wall thicknesses, thereby reducing the demands on the manufacturing technology for guiding the valve piston and coupler piston.
  • the object of the invention is achieved with the characterizing features of claim 1.
  • the main advantage of the coupler unit according to the invention is that no high-precision guides on thin-walled sleeves are required, so that no increased requirements have to be made of the production technology.
  • the essence of the invention is that the radial arrangement of coupler body and valve piston undergoes a kind of commutation by the valve piston has a sleeve-shaped guide portion and in the inner bore of the sleeve-shaped guide portion a housing fixedly arranged guide piston of the coupler body is arranged, on which the sleeve-shaped guide section axially is.
  • the sleeve-shaped valve piston thus has an annular end surface with an outer diameter d 1 and an inner diameter d3.
  • the reduced overall length of the coupler unit is achieved, in particular, by the coupler piston with the diameter d1 being guided axially displaceably on an outer peripheral surface of the sleeve-shaped guide section of the valve piston.
  • the coupler piston with the diameter d1 being guided axially displaceably on an outer peripheral surface of the sleeve-shaped guide section of the valve piston.
  • coupler unit requires that either coupler body or valve piston are to be formed from at least two individual components, because in a respective one-piece design of both components of the valve piston can not be pushed over the guide piston of the coupler body.
  • the sleeve-shaped guide portion on an outer peripheral surface on which the coupler piston is guided axially displaceably with an inner guide surface.
  • the coupler body has a support portion, which is supported on a housing-fixed component, wherein the valve piston is formed with the sleeve-shaped guide portion on one side of the support portion and with a pressure portion on the other side of the support portion.
  • the head body is made in several parts, with one part forming the guide piston and at least one further part forming the support section.
  • This alternative is carried out, for example, by the support section being designed by a transverse web and a support ring, wherein the crosspiece engages through the valve piston with an axial play.
  • the valve piston is designed in several parts with at least one upper part and at least one lower part, the upper part being formed by the sleeve-shaped guide section and the lower part by the pressure section.
  • coupling pin are formed between upper part and lower part, which pass through the support portion of the coupler body.
  • the support portion is designed with a plate-shaped disc, are formed in the apertures through which engage the coupling pin.
  • the coupling pins can be arranged on the sleeve-shaped guide section and / or on the pressure section of the valve piston.
  • the coupler gap volume is limited by an inner end wall of the coupler piston, an end face of the guide piston of the coupler body and an annular surface of the sleeve-shaped guide portion of the valve piston. Furthermore, the coupler piston have a collar pointing radially outwards and the coupler body has a further collar pointing radially outwards, against which the pretensioning spring acts in each case under pretensioning.
  • coupler unit 10 of a fuel injector has a fixedly connected to a housing part 11 of the fuel injector coupler body 12, a cup-shaped coupler piston 13 and a valve piston 14.
  • the coupler unit 10 further comprises radially outside of the coupler piston 13, a biasing spring 15, which with the lower end in the drawing plane on a collar 17 of the coupler body 12 and with the opposite, in the drawing plane upper end to another, formed on the coupler piston 13 collar 18th supported, between the further collar 18 and the biasing spring 15, a shim 20 is arranged.
  • the biasing spring 15 presses the Kopperkolben 13 via a transmission element, not shown, against an actuator unit, also not shown.
  • the biasing spring 15 thereby provides on the one hand for a bias of the coupler piston 13 against the actuator unit and on the other hand provides indirectly for a necessary for the functioning of the controlled by a piezoelectric actuator unit injection system bias of the piezoelectric actuator unit.
  • the coupler body 12 connected to the housing part 11 has a guide cylinder 21 with the diameter d3 arranged in the center of the coupler unit 10 and a support part 22 with the collar 17, with which the coupler body 12 rests on the housing part 11.
  • the valve piston 14 On the guide cylinder 21 of the coupler body 12, the valve piston 14 is guided at the diameter d3 with a sleeve-shaped portion 23, wherein the sleeve-shaped portion has an outer diameter d1.
  • the valve piston 14 also has a pressure section 24, which presses against a valve pin 25 of a valve element, not shown, which controls a control chamber of a nozzle needle of the fuel injector.
  • the pressure section 24 is arranged within a recess 26 which is surrounded by the support part 22 of the coupler body 12.
  • FIG. 1 is within the recess 26 continues to be a compression spring 27th arranged, which is supported on the housing-fixed coupler body 12 and with the opposite end to an annular shoulder 28 which is fixedly connected to the pressure portion 24 of the valve piston 14. By the compression spring 27, the valve piston 14 is pressed onto the valve pin 25.
  • the compression spring 27 is disposed between the coupler piston 13 and valve piston 14, wherein the annular shoulder 28 is formed for supporting the compression spring 27 on the guide portion 23 of the valve piston 14.
  • the pot-shaped coupler piston 13 is designed with a cylindrical peripheral wall 31 and a solid, end-side termination 32 with an end wall 33, wherein the cylindrical peripheral wall 31 forms an inner guide surface 34.
  • the cup-shaped coupler piston 13 is guided with the inner guide surface 34 at the diameter d1 of the sleeve-shaped guide portion 23 of the valve piston 14.
  • a pressure chamber 40 is formed, which limits a Kopplerspaltvolumen.
  • the effective translation surface for the coupler unit with the annular surface 36 is thus ⁇ / 4 (d1 2 - d3 2 ).
  • valve piston 14 of the present coupler unit 10 The peculiarity of the valve piston 14 of the present coupler unit 10 is that the valve piston 14 is located with a part above the housing-fixed support member 22 and with a second part below the housing-fixed support member 22 of the coupler body 12.
  • the acting on the two sides of the coupler body 12 parts of the Ventikolbens 14 require that either the coupler body 12 is composed of at least two components or the valve piston 14 of at least two components.
  • FIGS. 3 and 4 show an embodiment with a multi-part coupler body 12, this embodiment in the embodiment in FIG. 1 was used.
  • the coupler body 12 in this case has an inner punch 41, a transverse strut 42 and a support ring 43, wherein the inner punch 41 the guide cylinder 21 and the cross member 42 and the support ring 43, the support member 22 form.
  • the inner punch 41 is designed with a transverse bore 44 for receiving the transverse strut 42.
  • the valve piston 14 has at the same height a further transverse bore 45. For assembly of valve piston 14 and coupler body 12, the inner punch 41 is first introduced into the inner bore of the valve piston 14.
  • the cross member 42 is pushed through the transverse bores 44, 45 of the valve piston 14 and inner punch 41 and firmly connected to the inner punch 41.
  • This can be z. B. carried out by performing a press fit between the inner punch 41 and cross member 42, or by friction welding, by locking or by gluing.
  • the transverse strut 42 is received with an axial clearance 49, so that the valve piston 14 can later freely perform an axial movement.
  • the crossbar 42 is finally connected to the support ring 43, for example by welding. This ensures that in the assembled state of the multi-part coupler body 12 above the housing-fixed support member 22 of the sleeve-shaped portion 23 of the valve piston 14 and below the housing-fixed support member 22 of the pressure portion 24 of the valve piston 14 is located.
  • FIG. 5 shows an embodiment with a one-piece coupler body 12 and a multi-part valve piston 14, this embodiment in the embodiment in FIG. 2 was used.
  • the coupler body 12 is designed substantially rotationally symmetrical, wherein the guide cylinder 21, a plate-shaped disc 51 is formed, which merges in the outer region in a cylindrical support ring 53.
  • the disk 51 and the support ring 53 form the support part 22.
  • a detailed illustration of the coupler body 12 in FIG. 5 goes out of the FIGS. 6 and 7 out.
  • the plate-shaped disk 51 has a plurality of, in the present embodiment, six openings 52 through which, as will be described later, the valve piston 14 is passed.
  • the valve piston 14 consists of an upper part 55 and a lower part 56.
  • the upper part 55 is formed by the sleeve-shaped guide section 23, which is designed with coupling pin 57 at the end remote from the coupler gap.
  • the coupling pin 57 pass through the openings 52, as in FIG. 8 is shown.
  • the lower part 56 of the valve piston 14 has a closed end face 58, which projects on a lower side 59 of the dish-shaped disk 51 Coupling pin 57 of the upper part 55 abuts ( FIG. 5 ). It is important that the valve force, which is responsible for the refilling of the coupler gap acts on the upper part 55 of the valve piston 14 and the lower part 56 of the valve piston 14 presses in the idle state of the coupler unit 10 against the valve pin 25 of the control valve, not shown.
  • the preparation of the coupling pin 57 of the upper part 55 of the valve piston 14 is by means of FIG. 9 explained.
  • three grooves 61 are introduced into the lower ring surface of the upper part 55 of the valve piston 14 in the drawing plane in order to produce the six coupling pins 57.
  • the depth of the grooves 61 is designed so that the groove base is positioned with mounted coupler unit 10 above the plate-shaped disc 51 of the coupler body 12 in order to realize the required axial clearance 49.
  • the upper part 55 of the valve piston 14 has a depression 60 into which the lower part 56 of the valve piston 14 is received.
  • a radial guidance of the lower part 56 on the upper part 55 of the valve piston 14 is achieved.
  • a radial clearance between the outer diameter of the lower part 56 and the recess 60 may be provided.
  • the two diameters can also be designed so that an interference fit between the recess 60 and the lower part 56 of the valve piston 14 results, so that the upper part 55 and the lower part 56 of the valve piston 14 are joined during assembly of the two-part valve piston 14 by pressing. In the latter case, however, the coupler unit is no longer removable.
  • the radial guidance of the upper part 55 and the lower part 56 of the valve piston 14 to each other also be done in a different way.
  • a covenant on the upper end face of the lower part 56 of the valve piston 14, which includes the upper part 55 called.
  • a pin with a diameter on the upper end face of the lower part 56 of the Valve piston 14 is arranged, which is slightly smaller than the diameter d3, wherein the pin projects into the inner bore of the upper part 55 of the valve piston 14.

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

Claims (10)

  1. Injecteur de carburant comprenant une unité de coupleur hydraulique (10) qui comprend un corps de coupleur (12), un piston de coupleur (13) et un piston de soupape (14), le piston de coupleur (13) et le piston de soupape (14) étant guidés de manière déplaçable axialement par rapport au corps de coupleur (12) et définissant entre eux un espace de pression (40) limité dans la direction radiale par le corps de coupleur en tant que volume de fente de coupleur qui est rempli de carburant, afin de convertir un mouvement axial du piston de coupleur (13) en fonction d'un rapport de diamètre du piston de soupape (14) au piston de coupleur (13) en un mouvement axial du piston de soupape (14), le piston de coupleur (13) étant précontraint vers l'extérieur au moyen d'un ressort de précontrainte par le volume de fente de coupleur contre un élément d'actionneur et le piston de coupleur (13) présentant un évidement en forme de pot dans lequel le corps de coupleur (12) et le piston de soupape (14) sont reçus au moins en partie, caractérisé en ce que le piston de soupape (14) présente une portion de guidage en forme de douille (23) qui est guidée au niveau d'un piston de guidage (21) réalisé par le corps de coupleur (12) et disposé dans le centre de l'unité de coupleur (10).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que la portion de guidage en forme de douille (23) présente une surface périphérique extérieure au niveau de laquelle le piston de coupleur (13) est guidé de manière déplaçable axialement avec une surface de guidage interne (34).
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que le corps de coupleur (12) présente en outre une portion de support (22) qui s'appuie contre un composant fixé au boîtier (11) et en ce que le piston de soupape (14) s'étend avec la portion de guidage en forme de douille (23) d'un côté de la portion de support (22) et avec une portion de pression (24) de l'autre côté de la portion de support (22).
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que le corps de coupleur (12) est réalisé en plusieurs parties, une partie formant le piston de guidage (21) et au moins une autre partie formant la portion de support (22).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que la portion de support (22) est réalisée par une nervure transversale (42) et une bague de support (43), la nervure transversale (42) venant en prise à travers le piston de soupape (14) avec un jeu axial (49).
  6. Injecteur de carburant selon la revendication 3, caractérisé en ce que le piston de soupape (14) est réalisé en plusieurs parties avec au moins une partie supérieure (55) et au moins une partie inférieure (56), et en ce que la partie supérieure (55) est formée par la portion de guidage en forme de douille (23) et la partie inférieure est formée par une portion de pression (24).
  7. Injecteur de carburant selon la revendication 6, caractérisé en ce qu'entre la partie supérieure (55) et la partie inférieure (56) sont réalisés des tourillons d'accouplement (57) qui viennent en prise à travers la portion de support (22) du corps de coupleur (12).
  8. Injecteur de carburant selon la revendication 7, caractérisé en ce que la portion de support (22) est réalisée avec un disque en forme de coupelle (51) dans lequel sont réalisés des orifices (52) à travers lesquels s'engagent les tourillons d'accouplement (57).
  9. Injecteur de carburant selon la revendication 7 ou 8, caractérisé en ce que les tourillons d'accouplement (57) sont réalisés au niveau de la portion de guidage en forme de douille (23) et/ou au niveau de la portion de pression (24) du piston de soupape (14).
  10. Injecteur de carburant selon la revendication 1, caractérisé en ce que le volume de fente de coupleur est limité par une paroi frontale interne du piston de coupleur (13), une surface frontale du piston de guidage (41) du corps de coupleur (12) et une surface annulaire de la portion de guidage en forme de douille (23) du piston de soupape (14).
EP11724414.5A 2010-07-19 2011-06-06 Injecteur de carburant doté d'un ensemble coupleur hydraulique Not-in-force EP2596231B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010031497 DE102010031497A1 (de) 2010-07-19 2010-07-19 Kraftstoffinjektor mit hydraulischer Kopplereinheit
PCT/EP2011/059283 WO2012010368A1 (fr) 2010-07-19 2011-06-06 Injecteur de carburant doté d'un ensemble coupleur hydraulique

Publications (2)

Publication Number Publication Date
EP2596231A1 EP2596231A1 (fr) 2013-05-29
EP2596231B1 true EP2596231B1 (fr) 2014-11-12

Family

ID=44246420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11724414.5A Not-in-force EP2596231B1 (fr) 2010-07-19 2011-06-06 Injecteur de carburant doté d'un ensemble coupleur hydraulique

Country Status (4)

Country Link
EP (1) EP2596231B1 (fr)
CN (1) CN103003559B (fr)
DE (1) DE102010031497A1 (fr)
WO (1) WO2012010368A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014226673A1 (de) * 2014-12-19 2016-06-23 Robert Bosch Gmbh Hydraulische Kopplereinheit zur Steuerung eines Ventils

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200231A (en) * 1978-06-19 1980-04-29 General Motors Corporation Fuel injector nozzle
DE19940300A1 (de) * 1999-08-25 2001-03-01 Bosch Gmbh Robert Steuerventil für einen Injektor
DE10032517A1 (de) * 2000-07-05 2002-01-24 Bosch Gmbh Robert Injektor mit Steuerteilführung
DE10145620B4 (de) * 2001-09-15 2006-03-02 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE10322672A1 (de) 2003-05-20 2004-12-09 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
EP1690025B1 (fr) * 2003-12-05 2017-05-03 Continental Automotive GmbH Dispositif, procede pour produire ledit dispositif ; dispositif de chambre et dispositif de transfert
DE102004005456A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
JP4131251B2 (ja) * 2004-05-13 2008-08-13 株式会社デンソー 燃料噴射装置
DE102006050163A1 (de) * 2006-10-25 2008-04-30 Robert Bosch Gmbh Injektor mit axial-druckausgeglichenem Steuerventil
DE102007044361A1 (de) * 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor

Also Published As

Publication number Publication date
CN103003559B (zh) 2016-05-11
CN103003559A (zh) 2013-03-27
EP2596231A1 (fr) 2013-05-29
WO2012010368A1 (fr) 2012-01-26
DE102010031497A1 (de) 2012-01-19

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