EP1941152B1 - Injecteur doté d'un joint et d'une bague d'appui - Google Patents

Injecteur doté d'un joint et d'une bague d'appui Download PDF

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Publication number
EP1941152B1
EP1941152B1 EP06793710A EP06793710A EP1941152B1 EP 1941152 B1 EP1941152 B1 EP 1941152B1 EP 06793710 A EP06793710 A EP 06793710A EP 06793710 A EP06793710 A EP 06793710A EP 1941152 B1 EP1941152 B1 EP 1941152B1
Authority
EP
European Patent Office
Prior art keywords
sealing
openings
injector according
ring
supporting ring
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.)
Active
Application number
EP06793710A
Other languages
German (de)
English (en)
Other versions
EP1941152A1 (fr
Inventor
Martin Boehm
Lorenz Zerle
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 EP1941152A1 publication Critical patent/EP1941152A1/fr
Application granted granted Critical
Publication of EP1941152B1 publication Critical patent/EP1941152B1/fr
Active 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
    • 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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

Definitions

  • the invention relates to an injector, in particular for injecting fuel into a combustion chamber of an internal combustion engine according to the closer defined in the preamble of claim 1.
  • Such an injector is z. B. from the DE 102 20 457 A1 known.
  • the injector disclosed therein has a pressure chamber which is sealed between a high-pressure region and a low-pressure region by means of a sealing element.
  • the sealing element is received between two annular walls of the pressure chamber and a pressure chamber bottom and formed annular.
  • the sealing element is formed as a solid one-piece metallic sealing ring, which means a press fit is received on the inner annular wall.
  • an injector which has a sealing element which is designed as a sealing ring with a support ring.
  • the shear-soft sealing ring is made of a mixture of polytetrafluoroethylene (PTFE) and bronze powder, so that extrusion by means of the support ring is to be prevented.
  • the support ring is to prevent a high-pressure build-up between the sealing ring and the support ring, so that a high migration of the sealing ring is avoided.
  • the support ring on the edge crescent-shaped cutouts and relief grooves.
  • the invention provides an injector, in particular for injecting fuel into a combustion chamber of an internal combustion engine, with a longitudinally displaceable in a valve housing valve member and a formed between the valve housing and the valve element annular pressure chamber with a valve disposed between the valve body and valve element sealing element, wherein the sealing element is a sealing ring and a assigned Support ring and the sealing ring has a radially inner sealing surface and a radially outer sealing surface, and wherein according to the invention the support ring has at least one opening which is spaced from a radially inner and radially outer edge region of the support ring.
  • the injector according to the invention has the advantage that in the proposed design of the sealing element, the defined by the at least one opening Leckagequeritessional is clearly defined and can not be changed and undefined by a deformation of the support ring. As a result, the tolerances of the effective opening cross-sections are defined and can be handled more easily.
  • the influence of micro-movement between different elements of the injector is reduced to the leakage surfaces, since the leakage surfaces are located radially in the inner region of the support ring and not at its edge region.
  • the at least one opening is arranged in the radially central region of the support ring, since then the opening and the surrounding sealing surface is located on the primary pressure force line acts on the sealing ring.
  • the importance of the radial contact pressures for the sealing effect is almost canceled.
  • the fuel penetrating into the radial gap can no longer increase the shear load in the sealing ring material and thus increase the risk of extrusion.
  • FIG. 1 and also the FIG. 2 each show a section of an injector 1 for injecting fuel into a combustion chamber of an internal combustion engine, in particular for fuel injection systems of the common rail type for motor vehicles.
  • a pressure chamber 3 is formed, which is arranged in an annular manner around a valve element 4 designed as an insert part.
  • the pressure chamber 3 is formed by two radially spaced annular walls 3A, 3B and a pressure chamber bottom 8.
  • the radially inner annular wall 3A is formed by the valve element 4 and the radially outer annular wall 3B through the housing 2.
  • the pressure chamber 3 is by means of a bore 5 with a high pressure inlet 6 of a high pressure source in fluid communication.
  • annular sealing element 7 is disposed within the pressure chamber 3 at the brennraum workedem end, which by the pressure prevailing in the pressure chamber 3 high pressure on the pressure chamber bottom 8 and against the radial side walls 3A, 3B of the pressure chamber 3 is pressed.
  • the operation and structural design of the other elements of the injector 1 may be of conventional type as in the DE 102 20 457 A1 and the DE 196 19 523 A1 described.
  • the sealing element 10 is formed in two parts and consists of a push-soft sealing ring 11 made of PTFE and bronze powder and an underlying support ring 12 made of sheet steel.
  • the task of the support ring 12 is to prevent a material extrusion of the sealing ring 11 and a high-pressure construction between the sealing ring 11 and the support ring 12 in order to avoid thereby a possible high migration of the sealing ring 11.
  • the sealing effect of the sealing ring 11 is effected by radial contact pressure of the sealing material to the valve element 4 and the radial wall of the pressure chamber 3, wherein the contact pressure must always be at least as large as the high pressure to prevent ingress of the pressure medium in the sealing area.
  • the sealing ring 11 after FIGS. 3 and 4 has crescent-shaped cutouts (not shown) on the radially outer edge portion 13 of the support ring 12 in order to avoid a high migration of the sealing ring 11 due to a double seal by the sealing ring 11 and the support ring 12 and a pressure build-up between them.
  • the sickle-shaped leakage point opens a drainage possibility in a gap to the return or low pressure area when pressure medium, as in FIG. 4 shown penetrates into a gap 20 between the sealing ring 11 and the radially outer wall 3 B of the pressure chamber 3.
  • arrows 50 represent the axial primary high pressure load acting on the sealing ring due to the high pressure.
  • a secondary radial contact pressure 51 is generated which presses the sealing ring 11 against the radially spaced annular surfaces 3A, 3B of the pressure chamber 3.
  • an axial back pressure 52 which is transmitted through the support ring 12 to the sealing ring 11 acts.
  • FIG. 4 can be seen how an advance of pressure medium, such. As fuel, takes place under high pressure in the sealing gap 20 and leads to a deformation of the sealing ring 11. This results in a region 53 with increased thrust load in the sealing ring 11.
  • the Figures 5a, 5b and 5c show a support ring 30 of the sealing element 7 of the injector 1 of Figures 1 and 2 in a top view, in section and in a top view from below.
  • the support ring 30, which can be combined with a sealing ring according to FIG. 3, has a plurality of axially extending openings 31, which are distributed over the circumference of the support ring 30.
  • the openings 31 may be evenly distributed over the circumference of the support ring, for. B. at 90 ° angle, but also be distributed unevenly depending on the application.
  • the support ring 30 also has aligned in the radial direction grooves 32 which form a leakage path for the pressure medium in the radial direction inwardly toward a gap 54 on the underside of the support ring 30.
  • the grooves 32 are introduced by a forming process such as pressing in the support ring 30.
  • All of the grooves 32 had an outwardly radially sealing ridge 55 to safely prevent leakage flows between the annular surface 3B and the outer rim 30B.
  • four grooves 32 are uniform, d. H. at 90 ° to each other, distributed over the circumference of the support ring 30.
  • the number of grooves 32 and their distribution over the circumference of the support ring 30 vary.
  • an opening 31 can be arranged relative to a groove 32 with an arbitrary angular offset ⁇ .
  • the opening 31 is preferably provided in the region of the groove 32.
  • the openings 31 may be formed as round openings, such as holes. Preferably, they are formed with an opening diameter of about 0.1 mm at an inner diameter of the support ring 30 of about 8 mm and an outer diameter of about 10 mm.
  • the opening cross-sections can vary depending on the functional requirement in terms of shape, location and geometric design.
  • the openings are arranged away from the radially inner edge 30A and from the radially outer edge 30B of the support ring 30, preferably in the radial direction of the annular surface in the center of the support ring, which merges at its inner edge into an axially aligned gutter 56.
  • a double seal is particularly efficiently prevented by sealing ring and support ring and thus a high migration of the sealing ring, wherein the arrangement of the leakage openings in the central region of the support ring is advantageous in that a possible deformation of the support ring 30 has no effect on the Size of the leakage openings can take. As a result, the sealing element 7 is much less susceptible to tolerances.

Abstract

L'invention concerne un injecteur notamment pour injecter du carburant dans une chambre de combustion d'un moteur à combustion interne, cet injecteur comportant un élément soupape mobile dans le sens longitudinal dans une cage de soupape, une chambre de pression annulaire située entre la cage de soupape et l'élément soupape, un élément d'étanchéité étant monté dans la chambre de pression entre la cage de soupape et l'élément soupape. L'élément d'étanchéité comporte une bague d'étanchéité et une bague d'appui (30) associée, la bague d'étanchéité étant pourvue d'une surface d'étanchéité interne radiale et d'une surface d'étanchéité externe radiale. L'invention est caractérisée en ce que la bague d'appui (30) comprend au moins une ouverture (31) espacée d'une zone périphérique (30A, 30B) radiale interne et radiale externe de la bague d'appui (30).

Claims (9)

  1. Injecteur (1), notamment pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, avec un élément de soupape (4) déplaçable longitudinalement dans un boîtier de soupape (2) et une chambre de pression (3) de forme annulaire réalisée entre le boîtier de soupape (2) et l'élément de soupape (4) avec un élément d'étanchéité (7) disposé dans celle-ci entre le boîtier de soupape (2) et l'élément de soupape (4), l'élément d'étanchéité (7) présentant une bague d'étanchéité et une bague d'appui (30) associée et la bague d'étanchéité présentant une surface d'étanchéité située radialement à l'intérieur et une surface d'étanchéité située radialement à l'extérieur, caractérisé en ce que la bague d'appui (30) présente au moins une ouverture (31) qui est espacée d'une région de bord radialement interne et radialement externe (30A, 30B) de la bague d'appui (30).
  2. Injecteur selon la revendication 1, caractérisé en ce que la bague d'appui (30) présente en outre au moins une rainure (32), qui forme une voie de fuite dans la direction radiale vers l'intérieur.
  3. Injecteur selon les revendications 1 et 2, caractérisé en ce que chaque rainure (32) présente une nervure (55) orientée vers l'extérieur.
  4. Injecteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une pluralité d'ouvertures (31) sont disposées de manière répartie sur la périphérie de la bague d'appui (30).
  5. Injecteur selon la revendication 4, caractérisé en ce que les ouvertures (31) sont réparties uniformément sur la périphérie.
  6. Injecteur selon la revendication 4 ou 5, caractérisé en ce que les ouvertures (31) sont disposées par rapport à l'au moins une rainure (32) suivant un angle (α) par rapport à la position de la rainure.
  7. Injecteur selon la revendication 6, caractérisé en ce que chaque ouverture (31) est disposée centralement par rapport à la rainure, suivant une position angulaire de 0°.
  8. Injecteur selon l'une quelconque des revendications 4 à 7, caractérisé en ce que les ouvertures (31) sont des ouvertures approximativement circulaires axiales, notamment des alésages ou des estampages.
  9. Injecteur selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les ouvertures (31) présentent un diamètre d'au moins approximativement 0,1 mm.
EP06793710A 2005-10-11 2006-09-21 Injecteur doté d'un joint et d'une bague d'appui Active EP1941152B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510048541 DE102005048541A1 (de) 2005-10-11 2005-10-11 Injektor
PCT/EP2006/066588 WO2007042382A1 (fr) 2005-10-11 2006-09-21 Injecteur doté d'un joint et d'une bague d'appui

Publications (2)

Publication Number Publication Date
EP1941152A1 EP1941152A1 (fr) 2008-07-09
EP1941152B1 true EP1941152B1 (fr) 2010-04-07

Family

ID=37402265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06793710A Active EP1941152B1 (fr) 2005-10-11 2006-09-21 Injecteur doté d'un joint et d'une bague d'appui

Country Status (5)

Country Link
EP (1) EP1941152B1 (fr)
JP (1) JP2009511838A (fr)
CN (1) CN101283179B (fr)
DE (2) DE102005048541A1 (fr)
WO (1) WO2007042382A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8714139B2 (en) * 2009-01-16 2014-05-06 Illinois Tool Works Inc. Dual-phase spring assembly for use with fuel injector system
TR201108147A2 (tr) * 2011-08-16 2013-01-21 Robert Bosch Gmbh Etkin sızdırmazlık özelliğine sahip bir enjeksiyon valfı.
CN103899462B (zh) * 2012-12-31 2016-05-25 北京亚新科天纬油泵油嘴股份有限公司 一种燃料供给系统喷射器中的密封结构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134869U (ja) * 1984-02-20 1985-09-07 マツダ株式会社 燃料噴射ノズルの燃料もどし構造
DE4027499A1 (de) * 1990-08-30 1992-03-05 Bayerische Motoren Werke Ag Dichtring
US5342066A (en) * 1992-10-26 1994-08-30 Fmc Corporation Non-extrusion device for split annular casing/tubing hanger compression seals
DE10020870A1 (de) * 2000-04-28 2001-10-31 Bosch Gmbh Robert Common-Rail-Injektor
JP3567374B2 (ja) * 2001-07-16 2004-09-22 株式会社ボッシュオートモーティブシステム 燃料噴射弁のシール構造
DE102004015133A1 (de) * 2003-11-03 2005-06-02 Robert Bosch Gmbh Injektor

Also Published As

Publication number Publication date
EP1941152A1 (fr) 2008-07-09
CN101283179B (zh) 2011-04-13
DE502006006659D1 (de) 2010-05-20
CN101283179A (zh) 2008-10-08
WO2007042382A1 (fr) 2007-04-19
JP2009511838A (ja) 2009-03-19
DE102005048541A1 (de) 2007-04-12

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