EP0513020B1 - Injecteur de carburant avec raccordement au circuit de retour d'huile - Google Patents

Injecteur de carburant avec raccordement au circuit de retour d'huile Download PDF

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Publication number
EP0513020B1
EP0513020B1 EP91901696A EP91901696A EP0513020B1 EP 0513020 B1 EP0513020 B1 EP 0513020B1 EP 91901696 A EP91901696 A EP 91901696A EP 91901696 A EP91901696 A EP 91901696A EP 0513020 B1 EP0513020 B1 EP 0513020B1
Authority
EP
European Patent Office
Prior art keywords
bolt
injection nozzle
fuel
overflow
head
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
EP91901696A
Other languages
German (de)
English (en)
Other versions
EP0513020A1 (fr
Inventor
Karl Hofmann
Werner Wagner
Peter ASSLÄNDER
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 EP0513020A1 publication Critical patent/EP0513020A1/fr
Application granted granted Critical
Publication of EP0513020B1 publication Critical patent/EP0513020B1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings

Definitions

  • the invention relates to a fuel injector with a leakage oil connection according to the preamble of claim 1.
  • a cap screw with an axial blind hole in the threaded shaft and a transverse hole near the head is mainly used, with which a collecting ring with a connecting nipple is pressed tightly against the nozzle holder.
  • a banjo bolt is made of steel by several processing operations such as turning, drilling, deburring and tempering.
  • the passage for the leak oil is designed in the form of longitudinal grooves in the circumference of the threaded shaft of the cap screw.
  • the longitudinal grooves have a U-shaped cross-section and run helically in the thread of the shaft.
  • a disadvantage of the known fuel injection nozzle is that burrs or ridges occur in the manufacture of the grooves in the threaded shaft, which adversely affect the dimensional accuracy of the thread.
  • the object of the invention is to provide for the leakage oil connection to a fuel injector, a screw for connecting the collecting ring, the manufacture of which is simple and cheap, and in which the dimensional accuracy of the thread is very high for safe and simple installation.
  • the leakage oil connection of the fuel injection nozzle according to the characterizing feature of claim 1 has the Advantage that the screw that allows the leakage oil to the collecting ring can be produced by cold working. This manufacturing process, which is essentially reduced to cold forming, also eliminates the need for hardening and tempering.
  • the thread which can be produced in a simple manner with high precision and with interruptions in the area of the flats, can be formed on the shank of the cap screw by first cold-knocking the shank with the flats and then embossing the thread, so that the deformation areas on the thread part ends are displaced into the flats will.
  • the division of the die preferably lies in the center line of the flats, so that burrs can be avoided at all.
  • FIG. 1 shows a part of a nozzle holder with a leakage oil connection of a fuel injection nozzle in a longitudinal view, partly in section
  • FIG. 2 shows an embodiment of a cap screw of the leakage oil connection in a longitudinal view
  • FIG. 3 shows the cap screw according to FIG. 2 in a plan view.
  • a nozzle holder 1 of a fuel injection nozzle has a channel 2 for returning the leak oil, which opens into a threaded bore 3.
  • a leakage oil connection 5 is connected to this threaded bore 3 and has a cap screw 10 with a threaded shaft 11 and with a head 12 and a collecting ring 14.
  • the collecting ring 14, which has an inner annular groove 15 and a connecting nipple 16, is threaded onto the threaded shaft 11 of the screw 10 and pressed wildly by the head 12 of the screw 10 with the interposition of two sealing rings 17 against the nozzle holder 1.
  • the screw 10 has several, preferably four, longitudinal grooves 20 in the circumference of its threaded shaft 11, in the area of which the thread is interrupted.
  • the longitudinal grooves 20 run from the free end of the shaft 11 to close to the head 12 of the screw 10.
  • two grooves 20 are formed in the form of flats 22 on the shaft 11 of the screw 10.
  • the thread and the flats 22 are formed by cold hammering, the die division running in the center line of the flats 22.

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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 injecteur de carburant comporte un raccordement au circuit de retour d'huile (5) qui présente une vis à tête (10) vissée dans un orifice fileté (3) d'un porte-injecteur (1) et comportant un canal d'admission dans la tige filetée (11) et une bague collectrice (14) enserrée entre la tête (12) de la vis à tête et le porte-injecteur (1). Le canal d'admission se présente sous la forme d'au moins une rainure longitudinale (20, 21, 22) disposée sur le pourtour de la vis (10).

Claims (2)

  1. Injecteur de carburant avec raccordement au circuit de retour d'huile, comportant, montée dans un alésage fileté du support d'injecteur (1), une vis à tête (10) équipée d'un canal de passage ayant la forme de rainures (22) pratiquées à la périphérie de la tige filetée (11) ainsi qu'une bague collectrice (14) serrée entre la tête (12) de la vis (10) et le support (1) d'injecteur, caractérisé en ce que les rainures sont constituées par des parties aplaties (22) de la tige (11) de la vis (10).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que les parties aplaties (22) sont diamétralement opposées sur la tige (11) de la vis (10).
EP91901696A 1990-02-03 1991-01-17 Injecteur de carburant avec raccordement au circuit de retour d'huile Expired - Lifetime EP0513020B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9001194U DE9001194U1 (de) 1990-02-03 1990-02-03 Kraftstoffeinspritzdüse mit Leckölanschluß
DE9001194U 1990-02-03
PCT/DE1991/000030 WO1991011606A1 (fr) 1990-02-03 1991-01-17 Injecteur de carburant avec raccordement au circuit de retour d'huile

Publications (2)

Publication Number Publication Date
EP0513020A1 EP0513020A1 (fr) 1992-11-19
EP0513020B1 true EP0513020B1 (fr) 1994-09-14

Family

ID=6850625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901696A Expired - Lifetime EP0513020B1 (fr) 1990-02-03 1991-01-17 Injecteur de carburant avec raccordement au circuit de retour d'huile

Country Status (5)

Country Link
EP (1) EP0513020B1 (fr)
JP (1) JP2851425B2 (fr)
BR (1) BR9105979A (fr)
DE (2) DE9001194U1 (fr)
WO (1) WO1991011606A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10201353B4 (de) * 2002-01-16 2004-04-08 Daimlerchrysler Ag Hochdruckanschluss für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
CN108940626A (zh) * 2018-09-05 2018-12-07 红塔烟草(集团)有限责任公司 一种喷嘴防溢漏装置
CN111830410B (zh) * 2020-07-24 2022-11-29 上海外高桥造船有限公司 一种柴油发电机组油头试验固定及集油装置
USD1023736S1 (en) 2022-10-27 2024-04-23 Fleece Performance Engineering, Inc. Bolt

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1521875A (en) * 1977-03-08 1978-08-16 Zuev A Fluid conduit apparatus and a method of making same
JPS5752376Y2 (fr) * 1979-02-26 1982-11-13
DE8104261U1 (de) * 1981-02-17 1981-08-06 Robert Bosch Gmbh, 7000 Stuttgart Fluessigkeitsgekuehlte kraftstoffeinspritzduese

Also Published As

Publication number Publication date
BR9105979A (pt) 1992-11-10
EP0513020A1 (fr) 1992-11-19
DE9001194U1 (de) 1991-05-29
JP2851425B2 (ja) 1999-01-27
WO1991011606A1 (fr) 1991-08-08
JPH05504389A (ja) 1993-07-08
DE59102948D1 (de) 1994-10-20

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