EP1334272B1 - Injecteur permettant l'injection de carburant dans une chambre de combustion - Google Patents

Injecteur permettant l'injection de carburant dans une chambre de combustion Download PDF

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Publication number
EP1334272B1
EP1334272B1 EP01993757A EP01993757A EP1334272B1 EP 1334272 B1 EP1334272 B1 EP 1334272B1 EP 01993757 A EP01993757 A EP 01993757A EP 01993757 A EP01993757 A EP 01993757A EP 1334272 B1 EP1334272 B1 EP 1334272B1
Authority
EP
European Patent Office
Prior art keywords
housing
injector
actuator
actuator housing
recess
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.)
Expired - Lifetime
Application number
EP01993757A
Other languages
German (de)
English (en)
Other versions
EP1334272A1 (fr
Inventor
Markus Mohr
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP1334272A1 publication Critical patent/EP1334272A1/fr
Application granted granted Critical
Publication of EP1334272B1 publication Critical patent/EP1334272B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/166—Selection of particular materials
    • 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
    • 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
    • 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
    • F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to an injector for injecting Fuel into a combustion chamber.
  • Such an injector usually has an actuator that controls an injection valve. Will the injector through the actuator is opened, fuel is fed into a combustion chamber injected.
  • the actuator actuates a servo valve, which in turn opens the injector hydraulically and closes.
  • the actuator can be controlled electrically.
  • the actuator consists of piezoelectric elements and expands when an electrical voltage is applied.
  • Figure 1 is a cross section through a part an injector with an actuator an actuator housing, one Seal, a projection, a recess, a recess, a top surface, a further recess, a Valve piston, a valve mushroom, a control chamber and one Injector housing shows the structure of a typical injector described.
  • the actuator 10 ' is usually in an actuator housing 4 'arranged while the injector (not shown) and / or the servo valve, for example a Includes valve piston 6 'and a valve mushroom 7' in one Injector housing 1 'are arranged.
  • the injector housing 1 ' has a recess 2' into which Part of the actuator housing 4 'is inserted.
  • the deepening 2 'of the injector housing 1' has a first base which formed as a peripheral top surface 3 'for the actuator housing 4' is.
  • In the middle of this depression 2 ' is another Well 5 'arranged in the servo valve and / or the injection valve are arranged.
  • the servo valve and the injection valve includes, press.
  • the actuator housing 4 On its side Surface from a circumferential recess 11 'in which the Seal 13 ', for example an O-ring seal, arranged is. Due to the recess 11 ', the actuator housing 4' a projection 12 ', which is directed laterally.
  • the seal is stretched around the actuator housing. Subsequently the actuator housing is inserted into the injector housing. The seal rubs against the side walls of the recess of the injector housing. This is particularly important Disadvantage if the recess with a corrosion protection layer to be lined. It turned out that the friction between the seal and the anti-corrosion layer is so large that either the actuator housing cannot be inserted into the injector housing, or but the seal when inserting the actuator housing into it Injector housing is destroyed.
  • the invention has for its object an injector Injecting fuel into a combustion chamber to indicate at which the application of a corrosion protection layer in the recess of the injector housing is possible and at the same time one Leakage along interfaces between the injector housing and the actuator housing is prevented.
  • the problem is solved by an injector for injection of fuel in a combustion chamber with the following characteristics.
  • the injector has an actuator housing and an injector housing on.
  • the injector housing has a recess in which part of the actuator housing is arranged.
  • a bottom of the depression the injector housing is surrounded by a circumferential surface formed for the actuator housing.
  • Between the injector housing and a seal is arranged on the actuator housing to prevent leakage along interfaces between the injector housing and the actuator housing.
  • a bottom of the Actuator housing facing the top surface of the injector housing has a circumferential recess.
  • the recess the bottom of the actuator housing is such that the bottom of the actuator housing at least one circumferential Has projection that to the top surface of the injector housing is directed towards and on the top surface of the injector housing borders.
  • the seal is in the recess in the bottom the actuator housing and arranged around the projection the underside of the actuator housing. The seal borders on the top surface of the injector housing.
  • the seal on the bottom of the actuator housing and not is arranged on the lateral surfaces of the actuator housing no contact between the seal and the side surfaces the recess so that the actuator housing into the recess can be inserted without friction between the seal and deepening.
  • the recess with a Corrosion protection layer to be lined up while due leakage along the existing seal Interfaces between the injector housing and the actuator housing is prevented.
  • the seal can also be much easier in the recess be introduced as before, since the seal is not initially be slipped over a laterally protruding heel which requires increased expansion of the seal.
  • the actuator housing lies directly on the with its projection Contact surface of the injector housing. To usual ones Shims between the actuator housing and the injector housing on the top surface is dispensed with, otherwise the Seal only between the actuator housing and the shim acts, causing leakage between the shim and the injector housing can be done.
  • the idle stroke of the injector which is determined by the distance between the Actuator in the non-activated state and the valve device is determined, can also be set precisely without a shim become.
  • the injector has a servo valve on that of a valve piston and a valve mushroom consists.
  • the valve mushroom separates one control chamber from one Return line.
  • the valve mushroom is, for example, by a spring located in the control chamber against its seat pressed.
  • the valve piston is arranged outside the control chamber, that is in contact with the valve mushroom.
  • the valve piston is like this in one from the center of the depression outgoing further recess of the injector housing arranged, that a linear expansion of the actuator leads to a shift of the valve piston.
  • the displacement of the valve piston leads to the valve mushroom against the force of the Spring is lifted from its seat.
  • To adjust the Empty stroke of the injector is, for example, the distance between the top surface of the injector housing and the Surface of the valve mushroom facing away from the control chamber. Depending on this distance, the one for a given one Idle stroke determines the length of the valve piston required.
  • the Valve piston is chosen so that it has the required length has, and then inserted into the injector housing.
  • the actuator housing is inserted into the recess of the injector housing inserted.
  • the recess on the underside of the actuator housing can be designed in this way be that the bottom of the actuator housing two Has protrusions: an inner protrusion and an outer, the inner surrounding ledge.
  • the seal is in this case between the inner protrusion and the outer Projection arranged.
  • the recess is preferably the underside of the actuator housing such that the bottom of the actuator housing has only a single circumferential projection around which the Seal is cocked. In this case there is no outside Head Start.
  • the seal can be more easily inserted into the Recess are used.
  • Another advantage is there in that the depression of the injector housing with less Effort can be produced, which is explained below becomes.
  • the groove edge is used to create the recess of the injector housing between the side walls of the recess and the top surface of the injector housing is first rounded.
  • An actuator housing with non-rounded edges can be in such a depression not up to the top surface of the injector housing be introduced. Before that, the deepening must continue processed by widening the groove edges, so that the edges of the actuator housing are expanded into the Fit the groove edges.
  • the depression of the injector housing is preferably with a Corrosion protection layer lined.
  • the corrosion protection layer consists essentially of, for example Zinc phosphate.
  • the seal can be made essentially of an elastomer, such as z. B. fluororubber exist.
  • the Projection is formed such that its the side surface surface facing the depression of the injector housing is.
  • the inclination is such that the projection in the area the top surface of the injector housing the side surfaces of the recess is located in the area of its Approach.
  • the injector has an injector housing 1 with a recess 2 on.
  • the recess 2 of the injector housing 1 is with a approx. 2-3 ⁇ m thick corrosion protection layer 14 lined.
  • the Corrosion protection layer 14 consists of zinc phosphate.
  • a bottom of the recess 2 of the injector housing 1 is through a circumferential top surface 3 for an actuator housing 4 is formed.
  • the injector housing 1 In the middle of the recess 2, the injector housing 1 a further recess 5.
  • a valve piston 6 and a valve mushroom 7 are arranged, the to be in contact with each other.
  • the valve mushroom 7 separates one Control chamber 8 from a return line 15.
  • the valve mushroom 7 is arranged in the control chamber 8 by a spring 9 in pressed its valve seat.
  • part of the actuator housing 4 is arranged.
  • a piezoelectric actuator 10 is arranged in the actuator housing 4.
  • the actuator 10 is in this way relative to the valve piston 6 arranged that with a longitudinal expansion of the actuator 10 by Applying a voltage exerts a force on the valve piston 6 is, so that the valve piston 6 downward direction Valve seat 7 moves and the valve seat 7 from its Seat lifts.
  • the actuator housing 4 On its underside, the actuator housing 4 has which faces the discharge surface 3 of the injector housing 1, a circumferential recess 11. This reces 11 is such that the underside of the actuator housing 4 exactly one has circumferential projection 12 to the top surface 3 of the injector housing 1 is directed and to the top surface 3 of the injector housing 1 is adjacent.
  • the projection 12 of the The underside of the actuator housing 4 has one of the side surfaces the recess 2 of the injector housing 1 facing side Surface that is inclined. This widened the projection 12 of the underside of the actuator housing 4 in Direction of the top surface 3 of the injector housing 1.
  • a seal 13 in the form of a ring is in the recess 11 the bottom of the actuator housing 4 and arranged around the projection 12 excited.
  • the seal 13 is between the actuator housing 4 and the injector housing 1 arranged such that they adjacent to the top surface 3 of the injector housing 1.
  • the Seal 13 is made of fluororubber.
  • valve mushroom 7 If the valve mushroom 7 is activated by actuating the actuator 10 its seat raised, the pressure of the fuel drops in the control chamber 8. In a hydraulic manner, this is a injector, not shown, raised from its seat, so that fuel is injected into a combustion chamber.

Landscapes

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

Abstract

Selon la présente invention, un boîtier d'injecteur (1) de l'injecteur présente un évidement (2) dans lequel est disposé un boîtier d'actionnement (4) de l'injecteur. Le fond de l'évidement (2) est formé par une surface d'appui périphérique (3) destinée au boîtier d'actionnement (4). Un côté inférieur du boîtier d'actionnement (4) est opposé à la surface d'appui (3) et présente une cavité périphérique (11). Cette cavité (11) est conçue de sorte que le côté inférieur du boîtier d'actionnement (4) présente au moins une partie en saillie périphérique (12) qui est dirigée vers la surface d'appui (3) et est adjacente à la surface d'appui (3). Un élément d'étanchéification (13) servant à éviter les fuites le long de surfaces adjacentes entre le boîtier d'injecteur (1) et le boîtier d'actionnement (4), est disposé dans la cavité (11) et est adjacent à la surface d'appui (3).

Claims (4)

  1. Injecteur pour l'injection de carburant dans une chambre de combustion,
    comportant un carter d'actionneur (4) et un carter d'injecteur (1),
    le carter d'injecteur (1) présentant un renforcement (2) dans lequel est disposée une partie du carter d'actionneur (4),
    un fond de renforcement (2) du carter d'injecteur (1) étant formé par une surface d'appui périphérique (3) pour le carter d'actionneur (4),
    un joint d'étanchéité (13) étant disposé entre le carter d'injecteur (1) et le carter d'actionneur (4) pour empêcher une fuite le long des surfaces limites entre le carter d'injecteur (1) et le carter d'actionneur (4),
    une face inférieure du carter d'actionneur (4), qui est tournée vers la surface d'appui (3) du carter d'injecteur (1), présente un évidement périphérique (11),
    l'évidement (11) de la face inférieure du carter d'actionneur (4) étant conçu de telle façon que la face inférieure du carter d'actionneur (4) présente au moins une saillie périphérique (12), qui est dirigée vers la surface d'appui périphérique (3) du carter d'injecteur (1) et qui vient en limite contre la surface d'appui périphérique (3) du carter d'injecteur (1),
    le joint d'étanchéité (13) étant disposé dans l'évidement (11) de la face inférieure du carter d'actionneur (4) et étant mis en tension autour de la saillie périphérique (12) de la face inférieure du carter d'actionneur (4) et étant disposé en limite contre la surface d'appui (3) du carter d'injecteur (1),
    l'évidement (11) de la face inférieure du carter d'actionneur (4) étant conçue de telle façon que la face inférieure du carter d'actionneur (4) présente une unique saillie périphérique (12) autour de laquelle est tendu le joint d'étanchéité (13),
       caractérisé en ce que
    une surface latérale de la saillie périphérique (12) de la face inférieure du carter d'actionneur (4), tournée vers la surface latérale de renforcement (2) du carter d'injecteur (1), est réalisée avec une inclinaison telle que le contact de la saillie (12) soit disposé plus loin de la surface latérale de renforcement (2) qu'une partie de la saillie (12), en limite contre la surface d'appui (3) du carter d'injecteur (1).
  2. Injecteur suivant la revendication 1,
    dans lequel le renforcement (2) du carter d'injecteur (1) est revêtu d'une couche de protection contre la corrosion (14).
  3. Injecteur suivant la revendication 2,
    dans lequel la couche de protection contre la corrosion (14) est constituée essentiellement de phosphate de zinc.
  4. Injecteur suivant l'une des revendications 1 à 3,
    dans lequel le joint d'étanchéité (13) est essentiellement constitué d'un élastomère.
EP01993757A 2000-11-10 2001-11-06 Injecteur permettant l'injection de carburant dans une chambre de combustion Expired - Lifetime EP1334272B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10055639 2000-11-10
DE10055639A DE10055639A1 (de) 2000-11-10 2000-11-10 Injektor zum Einspritzen von Kraftstoff in einen Brennraum
PCT/DE2001/004168 WO2002038942A1 (fr) 2000-11-10 2001-11-06 Injecteur permettant l'injection de carburant dans une chambre de combustion

Publications (2)

Publication Number Publication Date
EP1334272A1 EP1334272A1 (fr) 2003-08-13
EP1334272B1 true EP1334272B1 (fr) 2004-05-26

Family

ID=7662757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01993757A Expired - Lifetime EP1334272B1 (fr) 2000-11-10 2001-11-06 Injecteur permettant l'injection de carburant dans une chambre de combustion

Country Status (4)

Country Link
US (1) US7025292B2 (fr)
EP (1) EP1334272B1 (fr)
DE (2) DE10055639A1 (fr)
WO (1) WO2002038942A1 (fr)

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EP1500810A1 (fr) * 2004-01-29 2005-01-26 Siemens VDO Automotive S.p.A. Unité d'actionnement
US20070113828A1 (en) * 2005-11-22 2007-05-24 Fonville Carl E Fuel injector isolating and sealing member
US7429815B2 (en) * 2006-06-23 2008-09-30 Caterpillar Inc. Fuel injector having encased piezo electric actuator
US20080022974A1 (en) * 2006-07-28 2008-01-31 Caterpillar Inc. Multi-stage relief valve having different opening pressures
US7950596B2 (en) * 2008-06-27 2011-05-31 Caterpillar Inc. Distributed stiffness biasing spring for actuator system and fuel injector using same
FR3013392B1 (fr) * 2013-11-21 2017-12-29 Continental Automotive France Procede de surveillance d'un injecteur de carburant d'un moteur a combustion interne d'un vehicule
CH710127A1 (de) * 2014-09-17 2016-03-31 Ganser Crs Ag Brennstoffeinspritzventil für Verbrennungskraftmaschinen.
JP2019100208A (ja) * 2017-11-29 2019-06-24 株式会社デンソー 燃料噴射弁

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Also Published As

Publication number Publication date
EP1334272A1 (fr) 2003-08-13
US7025292B2 (en) 2006-04-11
DE50102438D1 (de) 2004-07-01
US20030226912A1 (en) 2003-12-11
DE10055639A1 (de) 2002-05-23
WO2002038942A1 (fr) 2002-05-16

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