WO2007042382A1 - 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
WO2007042382A1
WO2007042382A1 PCT/EP2006/066588 EP2006066588W WO2007042382A1 WO 2007042382 A1 WO2007042382 A1 WO 2007042382A1 EP 2006066588 W EP2006066588 W EP 2006066588W WO 2007042382 A1 WO2007042382 A1 WO 2007042382A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
ring
injector according
openings
injector
Prior art date
Application number
PCT/EP2006/066588
Other languages
German (de)
English (en)
Inventor
Martin Boehm
Lorenz Zerle
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
Priority to EP06793710A priority Critical patent/EP1941152B1/fr
Priority to JP2008534970A priority patent/JP2009511838A/ja
Priority to DE502006006659T priority patent/DE502006006659D1/de
Priority to CN2006800376511A priority patent/CN101283179B/zh
Publication of WO2007042382A1 publication Critical patent/WO2007042382A1/fr

Links

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 DE 102 20 457 Al 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 designed as a solid one-piece metallic sealing ring, which mit- Is received by means of a press fit on the inner annular wall.
  • an injector which has a sealing element which is designed as a sealing ring with a nozzle ring.
  • the non-slip sealing ring is made of a mixture of polytetrafluor- oxylene (PTFE) and bronze powder, so that extrusion by means of the sleeve ring is to be prevented.
  • PTFE polytetrafluor- oxylene
  • the nozzle ring should prevent a high-pressure build-up between the sealing ring and the nozzle ring, so that high-wall migration of the sealing ring is avoided.
  • the nozzle ring on the edge crescent-shaped cutouts and relief grooves.
  • plastic deformation of the nozzle ring may result as a result of high-pressure loading, so that the effective cross-section of the recess is undefined and very toleranced.
  • the invention provides an injector, in particular for injecting fuel into a combustion chamber of an internal combustion engine, with a valve housing slow-displaceable valve element and formed between the valve housing and the valve element annular pressure chamber with a valve housing between the valve element and arranged sealing element, wherein the sealing element is a sealing ring and a to- having ordered Stutzring and the sealing ring has a radially inner sealing surface and a radially outer sealing surface, and wherein according to the invention the nozzle ring has at least one opening which is spaced from a radially inner and radially outer edge region of the nozzle 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 Leckagequeritessflache is clearly defined and can not be changed by a deformation of the nozzle ring and Undefined. This also defines the tolerances of the effective opening cross sections and can thus be handled more easily.
  • the influence of a 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 nozzle ring and not at its edge region.
  • the at least one opening in the radially central region of the nozzle ring is arranged, since then the opening and the surrounding sealing surface is located on the primary pressure force line, the 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 thrust load in the sealing ring material and thus increase the risk of extrusion.
  • FIG. 1 shows a schematic representation of an injector according to the invention with a sealing element
  • Figure 2 shows an area X of Figure 1 on an enlarged scale
  • FIG. 3 shows the operating principle of a sealing element without openings according to the invention
  • FIG. 4 shows a further illustration of the operating principle of a sealing element without openings according to the invention
  • Figure 5a is a plan view of a nozzle ring of a sealing element with selectively arranged holes in isolation;
  • Figure 5b shows a cross section through the nozzle ring of Figure 5a;
  • FIG. 5c shows a bottom view of the support ring of FIGS. 5a and 5b.
  • FIG. 5d shows an enlarged cross section through the support ring of FIG. 5b.
  • FIG. 1 and also FIG. 2 each show a detail of an injector 1 for injecting fuel into a combustion chamber of an internal combustion engine, in particular for common-rail fuel-injection systems 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 mode of action and structural design of the other elements of the injector 1 may be of conventional type as described in DE 102 20 457 Al and DE 196 19 523 Al, the content of which expressly belongs to the disclosure of the present application documents.
  • Figures 3 and 4 show the Dichtelement Signmoid based on a sealing element 10 of known type.
  • 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 nozzle ring 12 made of sheet steel.
  • the task of the slotted ring 12 is to prevent a material extrusion of the sealing ring 11 and a high-pressure build-up between the sealing ring 11 and the slotted ring 12 in order to avoid a possible high-altitude 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 according to Figures 3 and 4 has crescent-shaped cutouts (not shown) on the radially outer edge portion 13 of the nozzle 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 nozzle ring 12 and a pressure build-up between them.
  • the crescent-shaped leakage point opens a discharge possibility in a gap to the return or low pressure area when pressure medium, as shown in Figure 4, penetrates into a gap 20 between the sealing ring 11 and the radially outer wall 3B of the pressure chamber 3.
  • the 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 nozzle ring 12 on the sealing ring 11 acts.
  • FIG. 4 it can be seen how an advance of pressure medium, such as. 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.
  • 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 plan view from above, in section and in a plan 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, z. 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 towards a gap 54 on the underside of the support ring 30.
  • the grooves 32 are introduced into the support ring 30 by a forming process such as pressing.
  • All of the grooves 32 had an outwardly radially sealing ridge 55 to safely avoid leakage currents between ring surface 3B and outer edge 3OB.
  • grooves 32 are gleichmatiig, d. H. at 90 ° to each other, distributed over the circumference of the stub 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 O Stammsquerschmtte can vary depending on the functional requirement in shape, position and geometric training.
  • the openings are arranged away from the radially inner edge 30A and from the radially outer edge 3OB of the stub ring 30, preferably in the radial direction of the annular surface in the center of the stub ring, which merges at its inner edge into an axially aligned gutter 56.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Gasket Seals (AREA)

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).
PCT/EP2006/066588 2005-10-11 2006-09-21 Injecteur doté d'un joint et d'une bague d'appui WO2007042382A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06793710A EP1941152B1 (fr) 2005-10-11 2006-09-21 Injecteur doté d'un joint et d'une bague d'appui
JP2008534970A JP2009511838A (ja) 2005-10-11 2006-09-21 シール部材および支持リングを備えたインジェクタ
DE502006006659T DE502006006659D1 (de) 2005-10-11 2006-09-21 Injektor mit dichtung und stützring
CN2006800376511A CN101283179B (zh) 2005-10-11 2006-09-21 具有密封装置和支撑环的喷射器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510048541 DE102005048541A1 (de) 2005-10-11 2005-10-11 Injektor
DE102005048541.3 2005-10-11

Publications (1)

Publication Number Publication Date
WO2007042382A1 true WO2007042382A1 (fr) 2007-04-19

Family

ID=37402265

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/066588 WO2007042382A1 (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
WO2010082991A1 (fr) * 2009-01-16 2010-07-22 Illinois Tool Works Inc. Ensemble ressort à deux phases pour une utilisation avec un système d'injecteur de carburant
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4027499A1 (de) * 1990-08-30 1992-03-05 Bayerische Motoren Werke Ag Dichtring
GB2271793A (en) * 1992-10-26 1994-04-27 Fmc Corp Seal anti-extrusion device
WO2001083978A1 (fr) * 2000-04-28 2001-11-08 Robert Bosch Gmbh Injecteur par accumulation de pression
WO2005042963A1 (fr) * 2003-11-03 2005-05-12 Robert Bosch Gmbh Injecteur

Family Cites Families (2)

* 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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4027499A1 (de) * 1990-08-30 1992-03-05 Bayerische Motoren Werke Ag Dichtring
GB2271793A (en) * 1992-10-26 1994-04-27 Fmc Corp Seal anti-extrusion device
WO2001083978A1 (fr) * 2000-04-28 2001-11-08 Robert Bosch Gmbh Injecteur par accumulation de pression
WO2005042963A1 (fr) * 2003-11-03 2005-05-12 Robert Bosch Gmbh Injecteur

Also Published As

Publication number Publication date
JP2009511838A (ja) 2009-03-19
DE102005048541A1 (de) 2007-04-12
CN101283179B (zh) 2011-04-13
EP1941152A1 (fr) 2008-07-09
DE502006006659D1 (de) 2010-05-20
EP1941152B1 (fr) 2010-04-07
CN101283179A (zh) 2008-10-08

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