EP0418271B1 - Injecteur de carburant pour moteurs a combustion interne - Google Patents

Injecteur de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP0418271B1
EP0418271B1 EP89906031A EP89906031A EP0418271B1 EP 0418271 B1 EP0418271 B1 EP 0418271B1 EP 89906031 A EP89906031 A EP 89906031A EP 89906031 A EP89906031 A EP 89906031A EP 0418271 B1 EP0418271 B1 EP 0418271B1
Authority
EP
European Patent Office
Prior art keywords
nozzle holder
ball
nozzle
injection nozzle
holder
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
EP89906031A
Other languages
German (de)
English (en)
Other versions
EP0418271A1 (fr
Inventor
Karl Hofmann
Jürgen TREIBER
Horst Wellein
Werner Wagner
Helmut Fleischmann
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 EP0418271A1 publication Critical patent/EP0418271A1/fr
Application granted granted Critical
Publication of EP0418271B1 publication Critical patent/EP0418271B1/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
    • F02M61/14—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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention is based on a fuel injection nozzle according to the preamble of claim 1.
  • the component serving as an anti-rotation device is a ball which is pressed into a radial blind bore of the nozzle holder which is adapted to the ball diameter is.
  • This version is simple and despite the requirement of a relatively narrow diameter tolerance of the blind bore and ball also cheap, the achievable dimension of the ball over the outer circumference of the nozzle holder is only limited because on the one hand the center of the ball must lie within the outer diameter of the nozzle holder and on the other hand also For reasons of strength, the diameter of the ball and the blind bore cannot exceed a certain dimension in relation to the other dimensions of the nozzle holder.
  • the pin is in a ring collar of the nozzle holder arranged, on which at the same time the shoulder for the concept of the injector tightening the hollow screw is formed.
  • This arrangement is disadvantageous in that an additional machining operation on the nozzle holder is necessary to form the ring collar.
  • the shoulder for the concept of the hollow screw is formed on a snap ring which is seated in an annular groove on the outer circumference of the nozzle holder.
  • the central longitudinal section of the nozzle holder is of smooth-cylindrical design, but it can be disadvantageous in the case of particularly slim nozzle holders, its weakening by the annular groove for the snap ring, the diameter of which must not be less than a certain amount for reasons of strength and function.
  • a fuel injection nozzle is known, which is fastened with a hollow screw screwed onto the nozzle holder, which presses via a slotted pressure ring surrounding the nozzle holder onto the end face of the union nut with which the nozzle body on the nozzle holder is attached.
  • An anti-rotation device is not arranged on the nozzle holder.
  • the invention has for its object to provide a fuel injection nozzle with an anti-rotation device on the nozzle holder, the fastening of the wall of the nozzle holder is weakened as little as possible and which is easy to manufacture by machine.
  • the solution to this problem is specified in the characterizing part of claim 1.
  • the nozzle holder can be made very slim with a small outside diameter, the connection of the ball with the nozzle holder being able to withstand the high forces when mounting the injection nozzle with certainty.
  • the projection dimension of the ball over the circumference of the nozzle holder is sufficiently large. The use of a ball as an anti-rotation device is extremely cost-effective, since balls are available on a large scale as machine components.
  • the features specified in claim 2 provide a particularly simple fastening form for injection nozzles with a radially projecting anti-rotation device in the cylinder head of an internal combustion engine.
  • FIG. 1 shows a longitudinal section through the injection nozzle installed in a cylinder head of an internal combustion engine
  • FIG. 2 shows a side view of an individual part of the injection nozzle according to FIG. 1 in the direction of the arrow A shown there.
  • the injection nozzle has a nozzle body 20 which, together with an intermediate disk 22, is pressed against a nozzle holder 26 by a union nut 24.
  • a valve seat 28 is formed in the nozzle body 20 and a valve needle 30 is slidably supported by a closing spring 34 arranged in a chamber 32 of the nozzle holder 26 is pressed against the valve seat 28 via a pressure piece 36.
  • the union nut 24 is screwed onto a threaded section 38 of the nozzle holder 26 and a pressure ring 42 is supported on its upper end face 40, via which the hollow screw 14 screwed into a threaded section 44 of the bore 10 presses the injection nozzle against the bottom 18 of the bore 10.
  • a ball 50 is provided which is seated on the mouth edge 52 of a short, radial blind bore 54 in the nozzle holder 26 and is fastened there by resistance welding.
  • the ball 50 protrudes by the dimension a over the outer circumference of the nozzle holder 26 and into a longitudinal groove 56 in the wall of the bore 10, so that rotation of the ball 50 is avoided after the nozzle holder 26 has been inserted into the bore 10.
  • the ball 50 is arranged in the area of the pressure ring 42, which is provided at this point with a continuous longitudinal slot 58 (FIG. 2) and at the slot edges 60 with the recessed areas 62 adapted to the ball 50 indicated in FIG. 2.
  • the pressure ring 42 can be pushed over the ball 50 with temporary expansion and is held by this on the nozzle holder against unwanted loosening as long as the injection nozzle is not yet installed in the cylinder head 12.
  • the projection dimension a of the ball 50 is considerably larger than in the known embodiment, in which the ball is pressed into the blind bore, and in addition neither the ball 50 nor the blind bore 54 need to be tolerated particularly precisely.
  • an annular collar on the nozzle holder 26 or an annular groove which weakens the cross section for receiving a snap ring is not necessary, so that the nozzle holder can be designed to be both smooth-cylindrical and particularly slim and yet a reliable safeguard against rotation of the nozzle holder when tightening in the mounting hole is guaranteed.
  • the only work step which is not available in the prior art, namely the resistance welding of the ball 50 at the opening edge 52 of the blind bore 54, can be carried out with simple and tried and tested means without any noteworthy production expenditure.

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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)

Abstract

Un dispositif simple conçu pour éviter le gauchissement du porte-injecteur (26, 26a) lorsque celui-ci est serré dans la culasse du moteur, même lorsque le porte-injecteur est du type mince, comprend un composant (50, 70) qui est calé dans un support (52, 72) formé par un évidement (54, 74) ménagé dans la circonférence du porte-injecteur (26, 26a), et qui est assujetti au support de préférence par soudage par résistance. Afin de former un épaulement de serrage destiné à l'engagement d'un boulon creux à filet femelle (14) qui serre l'injecteur, un cône de serrage à fente (42) est monté sur l'écrou d'accouplement (24) et est pourvu, dans la région de sa fente, d'évidements (62) pour le composant (50, 70). Les injecteurs pour moteurs diesel constituent le domaine préférentiel d'application de l'invention.

Claims (2)

1.-Injecteur de carburant pour moteurs à combustion interne, avec un support de buse (26), auquel est fixée une bille (50) faisant saillie sur sa périphérie externe et qui pénètre dans un évidement correspondant (56) dans la paroi de l'alésage de montage (10) recevant l'injecteur dans la tête de cylindre (12) du moteur à combustion interne, et qui constitue un blocage en rotation pour le support de buse lorsque celui-ci est fixé dans l'alésage de montage par une vis creuse (14) glissée sur lui et qui vient en prise sur un épaulement de l'injecteur, tandis que la bille (50) jouant le rôle de blocage en rotation est fixée à un évidement (54) ménagé à la périphérie du support de buse (26), injecteur de carburant caractérisé en ce que le support de buse (26) comporte, en tant qu'évidement pour la fixation en position de la bille (50) un court perçage radial (54), dont le diamètre est plus petit que le diamètre de la bille, et que la bille (50) repose radialement par rapport à l'axe médian du support de buse (26) sur le bord (52) de l'embouchure du perçage borgne (54) et est fixée par soudage.
2.- Injecteur selon la revendication 1, caractérisé en ce que l'épaulement pour l'attaque de la vis creuse (14) fixant l'injecteur, est formé sur l'une des faces frontales d'un anneau de serrage fendu (42) glissé sur le support de buse (26) qui prend appui sur la face frontale (40) tournée vers lui d'un écrou d'accouplement (24) maintenant le corps de buse (20) sur le support de buse (26) et qui entoure avec du jeu, par des zones évidées (62) des bords (60) de sa fente, la bille (50) constituant le blocage en rotation.
EP89906031A 1988-06-06 1989-06-03 Injecteur de carburant pour moteurs a combustion interne Expired - Lifetime EP0418271B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3819218 1988-06-06
DE3819218 1988-06-06
DE3908796A DE3908796A1 (de) 1988-06-06 1989-03-17 Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3908796 1989-03-17

Publications (2)

Publication Number Publication Date
EP0418271A1 EP0418271A1 (fr) 1991-03-27
EP0418271B1 true EP0418271B1 (fr) 1992-08-26

Family

ID=25868862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89906031A Expired - Lifetime EP0418271B1 (fr) 1988-06-06 1989-06-03 Injecteur de carburant pour moteurs a combustion interne

Country Status (4)

Country Link
EP (1) EP0418271B1 (fr)
JP (1) JP2766015B2 (fr)
DE (2) DE3908796A1 (fr)
WO (1) WO1989012162A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052147A2 (fr) 2000-12-27 2002-07-04 Siemens Aktiengesellschaft Injecteur pour un moteur a combustion interne

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605956A1 (de) * 1996-02-17 1997-08-21 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
KR100301383B1 (ko) * 1996-07-18 2002-07-03 오카메 히로무 연료분사장치
DE19941054A1 (de) * 1999-08-28 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19954065A1 (de) * 1999-11-10 2001-05-23 Bosch Gmbh Robert Baugruppe zur Befestigung einer Einspritzdüse in einem Halter
DE10145988A1 (de) * 2001-09-18 2003-05-08 Siemens Ag Befestigungsanordnung zur Befestigung von Injektoren an einem Zylinderkopf
KR100680785B1 (ko) 2005-12-14 2007-02-08 현대자동차주식회사 실린더 헤드용 인젝터 튜브의 장착구조
DE102009052364A1 (de) 2009-11-07 2010-06-17 Daimler Ag Verdrehsicherungsvorrichtung zur verdrehsicheren Befestigung einer Einspritzleitung an einem Zylinderkopf eines Kraftfahrzeugs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777431A (en) * 1953-08-28 1957-01-15 Maschf Augsburg Nuernberg Ag Injection nozzle arrangement
DE2121127A1 (de) * 1971-04-29 1972-11-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzdüse
US3845748A (en) * 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
DE2303506A1 (de) * 1973-01-25 1974-08-01 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052147A2 (fr) 2000-12-27 2002-07-04 Siemens Aktiengesellschaft Injecteur pour un moteur a combustion interne
WO2002052147A3 (fr) * 2000-12-27 2002-09-06 Siemens Ag Injecteur pour un moteur a combustion interne

Also Published As

Publication number Publication date
DE3908796A1 (de) 1989-12-14
DE58902158D1 (de) 1992-10-01
EP0418271A1 (fr) 1991-03-27
WO1989012162A1 (fr) 1989-12-14
JP2766015B2 (ja) 1998-06-18
JPH03504752A (ja) 1991-10-17

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