WO2022179812A1 - Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne - Google Patents

Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne Download PDF

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Publication number
WO2022179812A1
WO2022179812A1 PCT/EP2022/052392 EP2022052392W WO2022179812A1 WO 2022179812 A1 WO2022179812 A1 WO 2022179812A1 EP 2022052392 W EP2022052392 W EP 2022052392W WO 2022179812 A1 WO2022179812 A1 WO 2022179812A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion chamber
chamber seal
sealing surface
fuel injector
receptacle
Prior art date
Application number
PCT/EP2022/052392
Other languages
German (de)
English (en)
Inventor
Walter Walkner
Alexander Fuchs
Rodrigo Antonio Pedroso
Helmut Giessauf
Gerhard Unterberger
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 WO2022179812A1 publication Critical patent/WO2022179812A1/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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a combustion chamber seal for a fuel! njector, in particular for a self-igniting internal combustion engine. Furthermore, the invention relates to an internal combustion engine with a combustion chamber seal according to the invention and a fuel injector.
  • combustion chamber seal in which a fuel injector protrudes in particular with its injection openings in a combustion chamber, it is known between a seat surface of a receptacle for the fuel! njektor to provide a combustion chamber seal in the area of a cylinder head and a front seat surface of the fuel injector.
  • a combustion chamber seal with the features of the preamble of claim 1 has become known from the applicant's DE 102009000285 A1.
  • the known combustion chamber seal is characterized by an annular design and, viewed in particular in the circumferential direction, has a uniform height with flat end faces.
  • Such a combustion chamber seal which in the case discussed also interacts with a sealing ring, is relatively easy to produce in terms of manufacturing technology.
  • the combustion chamber seal according to the invention for a fuel injector with the features of claim 1 has the advantage that it angular error between the facing seats on the receptacle for the fuel injector in the cylinder head and the fuel! njector can compensate, for example, due to manufacturing tolerances either in the area of the cylinder head of the internal combustion engine due to a seat surface that is not flat or perpendicular to the longitudinal axis of the fuel injector, due to manufacturing inaccuracies in the combustion chamber seal itself, and due to component tolerances on the seat surface of the fuel injector.
  • the invention is based on the idea of designing the sealing surface on the combustion chamber seal, in contrast to the prior art mentioned at the beginning, in which it is flat, in such a way that if there is an angular error between the interacting seat surfaces, this is compensated for by a special shape of the combustion chamber seal can be.
  • the first or the second sealing surface which is assigned to the fuel injector or the receptacle for the fuel injector in the cylinder, is at least partially spherical.
  • Such a design of the combustion chamber seal in connection with a geometrically oppositely designed counter surface, which is arranged at least directly on the fuel injector or the receptacle on the cylinder head, causes a possible orientation of the two spherical geometries in such a way that an existing angle error is compensated for and thus viewed in the circumferential direction a uniformly homogeneous seal or contact pressure for sealing the combustion chamber is made possible.
  • first or second sealing surface is completely spherical. This maximizes the contact surface that is available, thereby enabling a large radial offset, which is required to compensate for an angular error due to the adaptation of the spherical surfaces to one another. Since an angular error can be compensated for by the at least partially spherically configured one sealing surface, it is sufficient for the sealing surface of the combustion chamber seal opposite the at least partially spherically configured sealing surface to be configured as a flat sealing surface, which simplifies the manufacture of the combustion chamber seal.
  • the invention also includes an internal combustion engine with a combustion chamber and a fuel! njector that is used in a recording of a cylinder, wherein a base of the recording forms a seat surface which interacts at least indirectly with a second sealing surface of a combustion chamber seal that is opposite, and the fuel! njector is sealed against the combustion chamber at least indirectly with a combustion chamber seal according to the invention.
  • the base of the receptacle is of spherical design, at least in some areas, preferably in the entire area of the second sealing surface of the combustion chamber seal.
  • the base of the receptacle is flat at least in some areas, preferably in the entire area.
  • a sealing disk is arranged between the combustion chamber seal and the base of the receptacle, and that the sealing disk is flat on the side facing the base and spherical on the side facing the combustion chamber seal, with the combustion chamber seal on its second sealing surface is spherical.
  • FIG 3 shows a partial area of an internal combustion engine in the area of a combustion chamber seal in a simplified longitudinal section.
  • the internal combustion engine 100 is in the area of a cylinder 102 .
  • the internal combustion engine 100 is in particular a self-igniting internal combustion engine 100.
  • the cylinder 102 has a combustion chamber 104 which has a through-opening 106 for introducing a section of a fuel injector 1.
  • Cylinder 102 also has a bore or receptacle 108 on the side facing away from combustion chamber 104, which is designed to receive fuel injector 1 at least in certain areas.
  • the fuel injector 1 is in turn subjected to a force F in the direction of its longitudinal axis 2 by means of clamping means (not shown) in order to enable the combustion chamber 104 to be sealed off.
  • the fuel injector 1 has a nozzle body 3 which forms an axial end section of the fuel injector 1 and which has a plurality of injection openings 4 within the combustion chamber 104 in order to inject fuel into the combustion chamber 104 in a known manner.
  • the nozzle body 3 is axially secured or clamped to the housing of the fuel injector 1 by means of a nozzle clamping nut 5 .
  • a combustion chamber seal 10 is arranged on the flat underside 6, facing the combustion chamber 104, of the nozzle clamping nut 5, which forms an end face of the fuel injector 1, and on a base 110 of the receptacle 108.
  • the combustion chamber seal 10 is disc-shaped or ring-shaped and has a through-opening 12 for passing through a cylindrical portion of the nozzle body 3 .
  • the inner diameter of the through-bore 12 is adapted to the outer diameter of the nozzle body 3 in such a way that, in the installed state, there is at most a small amount of radial play between the elements mentioned.
  • the combustion chamber seal 10 On the side facing the underside 6 of the nozzle clamping nut 5 , the combustion chamber seal 10 has a first sealing surface 14 which interacts with the underside 6 . Furthermore, the combustion chamber seal 10 has a second sealing surface 16 on the side facing the base 110 , which in turn interacts with the base 110 . It is essential that the second sealing surface 16 of the combustion chamber seal 10 facing the base 110 is, at least in regions, completely spherical in shape in the illustrated embodiment, i.e. in the shape of a segment of a sphere with a radius R. also with a corresponding spherical shape or the radius R.
  • the material of the combustion chamber seal 10 is preferably made of metal, it being less hard than the material of the nozzle clamping nut 5 and the cylinder 102 in the area of the receptacle 108.
  • the combustion chamber seal 10 can be made of copper or a copper alloy.
  • Combustion chamber seal 10a differs from combustion chamber seal 10 in that combustion chamber seal 10a has a spherical first sealing surface 14a on the side facing fuel injector 1, and a planar second sealing surface 16a on the side facing base 110a. Furthermore, the base 110a is designed as a flat base 110a, while the underside 6a of the nozzle clamping nut 5a is designed with a geometry that is opposite to that of the first sealing surface 14a, ie is also shaped spherically. Finally, a variation of FIG. 1 is shown in FIG. In this case, instead of a spherically shaped base 110, a flat base 110b is used in the area of the receptacle 108.
  • a sealing disk 20 is arranged between combustion chamber seal 10b and base 110b, which is planar on the side facing base 110b and spherical in shape on the side facing combustion chamber seal 10b, with a contour or contour opposite to second sealing surface 16b . Shape.
  • first sealing surface 14b and the underside 6 of the nozzle clamping nut 5 are each flat
  • combustion chamber seal 10, 10a and 10b described so far can be altered or modified in many ways without deviating from the idea of the invention.

Landscapes

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

Abstract

L'invention concerne un joint d'étanchéité de chambre de combustion (10 ; 10a ; 10b) pour un injecteur de carburant (1), avec une ouverture traversante (12) pour le guidage à travers une section d'extrémité axiale (3), faisant face à une chambre de combustion (104) de l'injecteur de carburant (1), avec une première surface d'étanchéité (14 ; 14a ; 14b) qui est attribuée à une surface d'extrémité axiale (6 ; 6a) de l'injecteur de carburant (1), et une seconde surface d'étanchéité (16 ; 16a ; 16b) qui est attribuée à un support (108) pour l'injecteur de carburant (1), les deux surfaces d'étanchéité (14 ; 14a ; 14b, 16 ; 16a ; 16b) étant disposées sur des côtés d'extrémité opposés du joint d'étanchéité annulaire de chambre de combustion (10).
PCT/EP2022/052392 2021-02-24 2022-02-02 Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne WO2022179812A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021104408.1 2021-02-24
DE102021104408.1A DE102021104408A1 (de) 2021-02-24 2021-02-24 Brennraumdichtung für einen Kraftstoffinjektor und Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2022179812A1 true WO2022179812A1 (fr) 2022-09-01

Family

ID=80222554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/052392 WO2022179812A1 (fr) 2021-02-24 2022-02-02 Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102021104408A1 (fr)
WO (1) WO2022179812A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263863B1 (en) * 1998-07-01 2001-07-24 MAGNETI MARELLI S.p.A. Coupling system between engine head, injector and fuel manifold
EP1373713A1 (fr) * 2001-03-28 2004-01-02 Robert Bosch Gmbh Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne
JP2006022654A (ja) * 2004-07-06 2006-01-26 Mitsubishi Electric Corp 燃料噴射弁の組付け構造
JP2010138810A (ja) * 2008-12-11 2010-06-24 Denso Corp 燃料噴射弁の取付け構造
DE102009000285A1 (de) 2009-01-19 2010-07-22 Robert Bosch Gmbh Kraftstoff-Injektor sowie Brennkraftmaschine mit Kraftstoff-Injektor
JP2010185323A (ja) * 2009-02-11 2010-08-26 Denso Corp 燃料噴射弁の取付け構造およびそれに用いる燃料噴射弁の座金

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038300A1 (de) 2000-08-05 2002-02-14 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10109611A1 (de) 2001-02-28 2002-09-05 Bosch Gmbh Robert Brennstoffeinspritzventil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263863B1 (en) * 1998-07-01 2001-07-24 MAGNETI MARELLI S.p.A. Coupling system between engine head, injector and fuel manifold
EP1373713A1 (fr) * 2001-03-28 2004-01-02 Robert Bosch Gmbh Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne
JP2006022654A (ja) * 2004-07-06 2006-01-26 Mitsubishi Electric Corp 燃料噴射弁の組付け構造
JP2010138810A (ja) * 2008-12-11 2010-06-24 Denso Corp 燃料噴射弁の取付け構造
DE102009000285A1 (de) 2009-01-19 2010-07-22 Robert Bosch Gmbh Kraftstoff-Injektor sowie Brennkraftmaschine mit Kraftstoff-Injektor
JP2010185323A (ja) * 2009-02-11 2010-08-26 Denso Corp 燃料噴射弁の取付け構造およびそれに用いる燃料噴射弁の座金

Also Published As

Publication number Publication date
DE102021104408A1 (de) 2022-08-25

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