EP0513020B1 - Fuel-injection nozzle with an overflow-oil line - Google Patents

Fuel-injection nozzle with an overflow-oil line 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)
French (fr)
Other versions
EP0513020A1 (en
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0513020A1 publication Critical patent/EP0513020A1/en
Application granted granted Critical
Publication of EP0513020B1 publication Critical patent/EP0513020B1/en
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

The fuel-injection nozzle disclosed has an overflow-oil connection (5) which has a tap bolt (10) screwed into a threaded bore (3) in a nozzle holder (1) and a collector ring (14) clamped between the head (12) of the bolt and the nozzle holder (1), the bolt shank (11) having a channel through it. The channel is in the form of at least one longitudinal groove (20, 21, 22) on the periphery of the bolt (10)

Description

Die Erfindung bezieht sich auf eine Kraftstoffeinspritzdüse mit Leckölanschluß nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a fuel injector with a leakage oil connection according to the preamble of claim 1.

Für die Leckölrückführung am Düsenhalter von Einspritzdüsen wird überwiegend eine Kopfschraube mit einer axialen Sackbohrung im Gewindeschaft und einer Querbohrung nahe dem Kopf verwendet, mit der ein Auffangring mit Anschlußnippel dicht gegen den Düsenhalter gepreßt wird. Eine derartige Hohlschraube wird aus Stahl durch mehrere Bearbeitungsvorgänge wie Drehen, Bohren, Entgraten und Vergüten hergestellt.For the leakage oil return on the nozzle holder of injection nozzles, 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. Such a banjo bolt is made of steel by several processing operations such as turning, drilling, deburring and tempering.

Bei einer aus der US-A 4 315 603 bekannten Kraftstoffeinspritzdüse ist der Durchlaß für das Lecköl in Form von Längsrillen im Umfang des Gewindeschaftes der Kopfschraube ausgebildet. Die Längsrillen haben einen u-förmigen Querschnitt und verlaufen wendelförmig im Gewinde des Schaftes. Nachteilig bei der bekannten Kraftstoffeinspritzdüse ist, daß beim Herstellen der Nuten im Gewindeschaft Grate oder Wülste entstehen, die die Maßhaltigkeit des Gewindes beeinträchtigen.In a fuel injection nozzle known from US-A 4 315 603, 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.

Aufgabe der Erfindung ist es, für den Leckölanschluß an einer Kraftstoffeinspritzdüse eine Schraube zum Anschließen des Auffangringes zu schaffen, deren Herstellung einfach und billig ist, und bei der die Maßhaltigkeit des Gewindes für eine sichere und einfache Montage sehr hoch ist.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.

Der erfindungsgemäße Leckölanschluß der Kraftstoffeinspritzdüse nach dem kennzeichnenden Merkmal des Patentanspruchs 1 hat den Vorteil, daß dessen das Lecköl zum Auffangring durchlassende Schraube durch Kaltverformen herstellbar ist. Durch dieses im wesentlichen auf Kaltumformung reduzierte Herstellungsverfahren kann durch die Kaltverfestigung auch das Vergüten entfallen. Das in einfacher Weise mit hoher Präzision maßhaltig herstellbare Gewinde mit Unterbrechungen im Bereich der Abflachungen kann am Schaft der Kopfschraube geformt werden, indem zunächst der Schaft mit den Abflachungen kaltgeschlagen und anschließend das Gewinde geprägt wird, so daß die Verformungsbereiche an den Gewindeteilenden in die Abflachungen verdrängt werden. Dabei liegt die Teilung des Gesenks vorzugsweise in der Mittellinie der Abflachungen, so daß Grate überhaupt vermieden werden können.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.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigen Figur 1 einen Teil eines Düsenhalters mit Leckölanschluß einer Kraftstoffeinspritzdüse in Längsansicht teilweise im Schnitt, Figur 2 ein Ausführungsbeispiel einer Kopfschraube des Leckölanschlusses in Längsansicht, Figur 3 die Kopfschraube nach Figur 2 in Draufsicht.Embodiments of the invention are shown in the drawing and are described in more detail below. 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.

Ein Düsenhalter 1 einer Kraftstoffeinspritzdüse hat zum Rückführen des Lecköls einen Kanal 2, der in eine Gewindebohrung 3 mündet. Mit dieser Gewindebohrung 3 ist ein Leckölanschluß 5 verbunden, der eine Kopfschraube 10 mit einem Gewindeshaft 11 und mit einem Kopf 12 und einen Auffangring 14 aufweist. Der Auffangring 14, der eine innere Ringnut 15 und einen Anschlußnippel 16 hat, ist auf dem Gewindeschaft 11 der Schraube 10 aufgefädelt und wild von dem Kopf 12 der Schraube 10 unter Zwischenlage zweier Dichtungsringe 17 gegen den Düsenhalter 1 gepreßt.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.

Zum Rückströmen des Locköls aus dem Kanal 2 des Düsenhalters 1 in die Ringnut 15 des Auffangringes 14 und in den Anschlußnippel 16 hat die Schraube 10 im Umfang ihres Gewindeschaftes 11 mehrere, vorzugsweise vier Längsrillen 20, in deren Bereich das Gewinde unterbrochen ist. Die Längsrillen 20 verlaufen vom freien Stirnende des Schaftes 11 bis nahe zum Kopf 12 der Schraube 10.For backflow of the lure oil from the channel 2 of the nozzle holder 1 into the annular groove 15 of the collecting ring 14 and into the connecting nipple 16, 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.

Beim Ausführungsbeispiel nach Figur 2 und 3 sind zwei Rillen 20 in Form von Abflachungen 22 am Schaft 11 der Schraube 10 gebildet. Das Gewinde und die Abflachungen 22 werden durch Kaltschlagen geformt, wobei die Gesenkteilung in der Mittellinie der Abflachungen 22 verläuft.In the exemplary embodiment according to FIGS. 2 and 3, 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.

Claims (2)

  1. Fuel injection nozzle with leakage oil connection which has a head bolt (10) screwed into a threaded hole of a nozzle holder (1), the head bolt (10) having a passage duct in the form of channels (22) extending in the periphery of the threaded shank (11), and which has a collector ring (14) clamped between the head (12) of the head bolt (10) and the nozzle holder (1), characterised in that the channel is designed as flats (22), parallel to the axis, on the threaded shank (11) of the bolt (10).
  2. Fuel injection nozzle according to Claim 1, characterised in that the flats (22) on the threaded shank (11) of the bolt (10) are diametrically opposite to one another.
EP91901696A 1990-02-03 1991-01-17 Fuel-injection nozzle with an overflow-oil line Expired - Lifetime EP0513020B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9001194U DE9001194U1 (en) 1990-02-03 1990-02-03 Fuel injection nozzle with leak oil connection
DE9001194U 1990-02-03
PCT/DE1991/000030 WO1991011606A1 (en) 1990-02-03 1991-01-17 Fuel-injection nozzle with an overflow-oil line

Publications (2)

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

Family

ID=6850625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901696A Expired - Lifetime EP0513020B1 (en) 1990-02-03 1991-01-17 Fuel-injection nozzle with an overflow-oil line

Country Status (5)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10201353B4 (en) * 2002-01-16 2004-04-08 Daimlerchrysler Ag High-pressure connection for a fuel injection system for internal combustion engines
CN108940626A (en) * 2018-09-05 2018-12-07 红塔烟草(集团)有限责任公司 A kind of anti-overflow leakage device of nozzle
CN111830410B (en) * 2020-07-24 2022-11-29 上海外高桥造船有限公司 Oil head test fixing and oil collecting device of diesel generating set
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 (en) * 1979-02-26 1982-11-13
DE8104261U1 (en) * 1981-02-17 1981-08-06 Robert Bosch Gmbh, 7000 Stuttgart LIQUID-COOLED FUEL INJECTION NOZZLE

Also Published As

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

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