EP1099850A1 - Assembly for fixing an injector into a holder - Google Patents

Assembly for fixing an injector into a holder Download PDF

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Publication number
EP1099850A1
EP1099850A1 EP00122124A EP00122124A EP1099850A1 EP 1099850 A1 EP1099850 A1 EP 1099850A1 EP 00122124 A EP00122124 A EP 00122124A EP 00122124 A EP00122124 A EP 00122124A EP 1099850 A1 EP1099850 A1 EP 1099850A1
Authority
EP
European Patent Office
Prior art keywords
clamping
nozzle
holder
sleeve
nut
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.)
Withdrawn
Application number
EP00122124A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Schaef
Thomas Muehlbauer
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 EP1099850A1 publication Critical patent/EP1099850A1/en
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to an assembly for fastening an injection nozzle in one Holder, which is provided with a receiving opening for the injection nozzle.
  • the injection nozzle is usually inserted into the receiving opening by a clamping element pressed that on the rear side of the injector body, so on the side facing away from the nozzle needle, and the injection nozzle in presses the receiving opening.
  • the disadvantage of this type of attachment is in that the clamping force acting on the entire injector body Body compresses, which changes the stroke dimensions inside the injector has the consequence and leads to an impairment of the function.
  • the assembly according to the invention with the features of claim 1 the advantage that the required clamping force is essentially no longer above the Body of the injector is transferred.
  • the injector body no longer compressed, so that impairments of the function are avoided.
  • an offset of the lifting mechanism, as caused by tensioning the injector body avoided with a conventional arrangement.
  • the assembly shown in the single figure consists of an injection nozzle 10, which is mounted in a holder 12, for example a cylinder head.
  • the Holder 12 is provided with a receiving opening 14, in which the body 16 the injector is arranged.
  • This body is on its front side with provided with a thread 18 onto which a nozzle clamping nut 20 is screwed is.
  • the nozzle clamp nut 20 surrounds the front end of the body 16 of the injector and lies on the bottom of the receiving opening 14 on a sealing washer 22 on.
  • the nozzle clamping nut 20 also has a cylindrical guide section 24 on the stepped front section of the receiving opening 14 rests and for guiding the body 16 of the injection nozzle in the holder 12 cares.
  • an adapter sleeve 26 which extends up to that of the sealing washer 22 opposite end of the receiving opening 14 extends.
  • the clamping sleeve 26 is with provided with a guide ring 28 which is local for guiding the clamping sleeve 26 and thus the body 16 of the injection nozzle in the receiving opening 14.
  • a clamping element 29 in the form of a clamping claw is arranged on the holder 12, that with two rounded projections 30 at the rear end of the clamping sleeve 26 rests and by two schematically indicated screws 32 with the Holder 12 can be screwed.
  • the clamping element 29 then exercises the attachment the clamping force required by the injection nozzle onto the clamping sleeve 26, which in turn transmits them via the nozzle clamping nut 20.
  • the injector is thus securely and reliably fastened in the receiving opening 14 since they are in the clamped nozzle clamping nut is screwed in.
  • the one from the tensioning element Forces exerted on the clamping sleeve and the nozzle clamping nut act hardly on the body of the injector, so that it is not compressed.
  • Each the thread of the injector body is arranged further forward, the less are the effects of a compression of the nozzle clamping nut when tightening in the receiving opening.
  • a one-piece design can also be used, in which the clamping sleeve is designed as an extension of the nozzle clamping nut.
  • the clamping element in the form of a clamping claw one could also Clamping element can be used in the form of a flange on the rear End of the clamping sleeve 26 is formed.

Abstract

The assembly has a nozzle clamping nut (20) that is screwed onto the leading half of the nozzle body, a clamping sleeve (26) that interacts with the nozzle clamping nut and a clamp element (29) that acts on the clamping sleeve and holds the injection nozzle in a mounting opening (14) by means of the nozzle clamping nut. The clamping sleeve can be made in one piece with the clamping nut.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Baugruppe zur Befestigung einer Einspritzdüse in einem Halter, der mit einer Aufnahmeöffnung für die Einspritzdüse versehen ist.The invention relates to an assembly for fastening an injection nozzle in one Holder, which is provided with a receiving opening for the injection nozzle.

Üblicherweise wird die Einspritzdüse in die Aufnahmeöffnung von einem Spannelement gedrückt, das an der hinteren Seite des Körpers der Einspritzdüse, also auf der von der Düsennadel abgewandten Seite, angreift und die Einspritzdüse in die Aufnahmeöffnung drückt. Der Nachteil bei dieser Befestigungsart besteht darin, daß die auf den gesamten Einspritzdüsenkörper wirkende Spannkraft den Körper staucht, was eine Veränderung der Hubmaße im Inneren der Einspritzdüse zur Folge hat und zu einer Beeinträchtigung der Funktion führt.The injection nozzle is usually inserted into the receiving opening by a clamping element pressed that on the rear side of the injector body, so on the side facing away from the nozzle needle, and the injection nozzle in presses the receiving opening. The disadvantage of this type of attachment is in that the clamping force acting on the entire injector body Body compresses, which changes the stroke dimensions inside the injector has the consequence and leads to an impairment of the function.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Baugruppe mit den Merkmalen des Patentanspruchs 1 hat den Vorteil, daß die erforderliche Spannkraft im wesentlichen nicht mehr über den Körper der Einspritzdüse übertragen wird. Somit wird der Körper der Einspritzdüse nicht mehr gestaucht, so daß Beeinträchtigungen der Funktion vermieden sind. Insbesondere ergibt sich keine Verringerung des Düsennadelhubes. Auch wird ein Versatz der Hubmechanik, wie er durch ein Verspannen des Einspritzdüsenkörpers bei einer herkömmlichen Anordnung auftrat, vermieden. The assembly according to the invention with the features of claim 1 the advantage that the required clamping force is essentially no longer above the Body of the injector is transferred. Thus, the injector body no longer compressed, so that impairments of the function are avoided. In particular, there is no reduction in the nozzle needle stroke. Also will an offset of the lifting mechanism, as caused by tensioning the injector body avoided with a conventional arrangement.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of the invention result from the subclaims.

Zeichnungendrawings

Die Erfindung wird nachfolgend anhand einer bevorzugten Ausführungsform beschrieben, die in der beigefügten einzigen Figur dargestellt ist. In dieser ist in einer teilgeschnittenen Ansicht eine erfindungsgemäße Baugruppe dargestellt.The invention is described below on the basis of a preferred embodiment, which is shown in the attached single figure. In this is in one partially sectioned view of an assembly according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die in der einzigen Figur gezeigte Baugruppe besteht aus einer Einspritzdüse 10, die in einem Halter 12 angebracht ist, beispielsweise einem Zylinderkopf. Der Halter 12 ist mit einer Aufnahmeöffnung 14 versehen, in welcher der Körper 16 der Einspritzdüse angeordnet ist. Dieser Körper ist auf seiner vorderen Seite mit einem Gewinde 18 versehen, auf das eine Düsenspannmutter 20 aufgeschraubt ist. Die Düsenspannmutter 20 umgibt das vordere Ende des Körpers 16 der Einspritzdüse und liegt am Boden der Aufnahmeöffnung 14 an einer Dichtscheibe 22 an. Die Düsenspannmutter 20 weist weiterhin einen zylindrischen Führungsabschnitt 24 auf, der am gestuft ausgeführten vorderen Abschnitt der Aufnahmeöffnung 14 anliegt und für eine Führung des Körpers 16 der Einspritzdüse im Halter 12 sorgt.The assembly shown in the single figure consists of an injection nozzle 10, which is mounted in a holder 12, for example a cylinder head. The Holder 12 is provided with a receiving opening 14, in which the body 16 the injector is arranged. This body is on its front side with provided with a thread 18 onto which a nozzle clamping nut 20 is screwed is. The nozzle clamp nut 20 surrounds the front end of the body 16 of the injector and lies on the bottom of the receiving opening 14 on a sealing washer 22 on. The nozzle clamping nut 20 also has a cylindrical guide section 24 on the stepped front section of the receiving opening 14 rests and for guiding the body 16 of the injection nozzle in the holder 12 cares.

An das von der Dichtscheibe 22 abgewandte Ende der Düsenspannmutter 20 schließt sich eine Spannhülse 26 an, die sich bis zu dem von der Dichtscheibe 22 abgewandten Ende der Aufnahmeöffnung 14 erstreckt. Die Spannhülse 26 ist mit einem Führungsring 28 versehen, der lokal für eine Führung der Spannhülse 26 und somit des Körpers 16 der Einspritzdüse in der Aufnahmeöffnung 14 sorgt. Die zweiteilige Ausgestaltung von Spannhülse und Düsenspannmutter hat den Vorteil, daß die einzelnen Bauteile besser bearbeitet werden können und der Einfluß von Rundlauftoleranzen auf Montage und Funktion verringert werden kann. At the end of the nozzle clamping nut 20 facing away from the sealing disk 22 is followed by an adapter sleeve 26 which extends up to that of the sealing washer 22 opposite end of the receiving opening 14 extends. The clamping sleeve 26 is with provided with a guide ring 28 which is local for guiding the clamping sleeve 26 and thus the body 16 of the injection nozzle in the receiving opening 14. The Two-part design of the adapter sleeve and nozzle adapter nut has the advantage that the individual components can be processed better and the influence of Concentricity tolerances on assembly and function can be reduced.

Auf dem Halter 12 ist ein Spannelement 29 in der Form einer Spannpratze angeordnet, das mit zwei abgerundeten Vorsprüngen 30 am hinteren Ende der Spannhülse 26 anliegt und durch zwei schematisch angedeutete Schrauben 32 mit dem Halter 12 verschraubt werden kann. Das Spannelement 29 übt dann die zur Befestigung der Einspritzdüse erforderliche Spannkraft auf die Spannhülse 26 aus, die sie wiederum über die Düsenspannmutter 20 überträgt. Die Einspritzdüse ist somit sicher und zuverlässig in der Aufnahmeöffnung 14 befestigt, da sie in die eingespannte Düsenspannmutter eingeschraubt ist. Die von dem Spannelement auf die Spannhülse und die Düsenspannmutter ausgeübten Kräfte wirken dabei kaum auf den Körper der Einspritzdüse ein, so daß dieser nicht gestaucht wird. Je weiter vorne das Gewinde des Einspritzdüsenkörpers angeordnet sind, desto geringer sind die Auswirkungen einer Stauchung der Düsenspannmutter beim Festspannen in der Aufnahmeöffnung.A clamping element 29 in the form of a clamping claw is arranged on the holder 12, that with two rounded projections 30 at the rear end of the clamping sleeve 26 rests and by two schematically indicated screws 32 with the Holder 12 can be screwed. The clamping element 29 then exercises the attachment the clamping force required by the injection nozzle onto the clamping sleeve 26, which in turn transmits them via the nozzle clamping nut 20. The injector is thus securely and reliably fastened in the receiving opening 14 since they are in the clamped nozzle clamping nut is screwed in. The one from the tensioning element Forces exerted on the clamping sleeve and the nozzle clamping nut act hardly on the body of the injector, so that it is not compressed. Each the thread of the injector body is arranged further forward, the less are the effects of a compression of the nozzle clamping nut when tightening in the receiving opening.

Alternativ zu der gezeigten zweiteiligen Ausgestaltung von Düsenspannmutter und Spannhülse 26 kann auch eine einteilige Ausgestaltung verwendet werden, bei der die Spannhülse als Verlängerung der Düsenspannmutter ausgebildet ist. Alternativ zu dem Spannelement in der Form einer Spannpratze könnte auch ein Spannelement in der Form eines Flansches verwendet werden, der an dem hinteren Ende der Spannhülse 26 ausgebildet ist.As an alternative to the two-part design of nozzle clamping nut shown and clamping sleeve 26, a one-piece design can also be used, in which the clamping sleeve is designed as an extension of the nozzle clamping nut. As an alternative to the clamping element in the form of a clamping claw, one could also Clamping element can be used in the form of a flange on the rear End of the clamping sleeve 26 is formed.

Claims (5)

Baugruppe zur Befestigung einer Einspritzdüse (10) in einem Halter (12), der mit einer Aufnahmeöffnung (14) für die Einspritzdüse versehen ist, mit einer Düsenspannmutter (20), die auf die Einspritzdüse in deren vorderer Hälfte aufgeschraubt ist, einer Spannhülse (26), die mit der Düsenspannmutter zusammenwirkt, und einem Spannelement (29), das auf die Spannhülse einwirkt und die Einspritzdüse mittels der Düsenspannmutter in der Aufnahmeöffnung hält.Assembly for fastening an injection nozzle (10) in a holder (12), the is provided with a receiving opening (14) for the injection nozzle, with a nozzle clamping nut (20) screwed onto the injector in its front half is an adapter sleeve (26) which interacts with the nozzle adapter nut, and a clamping element (29) which acts on the clamping sleeve and which Hold the injection nozzle in the receiving opening using the nozzle clamping nut. Baugruppe nach Anspruch 1, dadurch gekennzeichnet, daß die Spannhülse (26) einstückig mit der Düsenspannmutter (20) ausgeführt ist.Module according to claim 1, characterized in that the clamping sleeve (26) is made in one piece with the nozzle clamping nut (20). Baugruppe nach Anspruch 1, dadurch gekennzeichnet, daß die Spannhülse (26) ein separates Bauteil ist.Module according to claim 1, characterized in that the clamping sleeve (26) is a separate component. Baugruppe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Spannelement ein Flansch an der Spannhülse ist, der mit dem Halter verschraubt ist.Assembly according to one of claims 1 to 3, characterized in that the clamping element is a flange on the clamping sleeve, which is screwed to the holder is. Baugruppe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Spannelement (29) eine Spannpratze ist, die mit dem Halter (12) verschraubt ist und an der Spannhülse anliegt.Assembly according to one of claims 1 to 3, characterized in that the clamping element (29) is a clamping claw which is screwed to the holder (12) and is in contact with the adapter sleeve.
EP00122124A 1999-11-10 2000-10-12 Assembly for fixing an injector into a holder Withdrawn EP1099850A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19954065 1999-11-10
DE1999154065 DE19954065A1 (en) 1999-11-10 1999-11-10 Assembly for fastening an injection nozzle in a holder

Publications (1)

Publication Number Publication Date
EP1099850A1 true EP1099850A1 (en) 2001-05-16

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EP00122124A Withdrawn EP1099850A1 (en) 1999-11-10 2000-10-12 Assembly for fixing an injector into a holder

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EP (1) EP1099850A1 (en)
JP (1) JP2001173542A (en)
DE (1) DE19954065A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005054661A1 (en) * 2003-12-05 2005-06-16 Siemens Aktiengesellschaft Injector comprising a clamping device to be mounted in a cylinder head, and clamping device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102937063B (en) * 2012-10-31 2015-04-29 中国北方发动机研究所(天津) Oil sprayer compress tightly screw cap and fixing method thereof
DE102015001614A1 (en) 2015-02-07 2016-08-11 Neander Motors Ag Device for fixing at least one fuel injection nozzle
DE102016009079A1 (en) 2016-07-27 2018-02-01 Neander Motors Aktiengesellschaft Fuel injection system for an internal combustion engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736446A (en) * 1953-04-15 1955-09-07 Cav Ltd Liquid fuel injection nozzle holders for internal combustion engines
GB774206A (en) * 1953-08-28 1957-05-08 Maschf Augsburg Nuernberg Ag Improvements in and relating to fuel injection nozzles for internal combustion engines
GB1148012A (en) * 1966-02-07 1969-04-10 Ustav Pro Vyzkum Motorovych Vo Improvements in or relating to draining of excess fuel from fuel injectors of internal combustion compression ignition engines
DE3908796A1 (en) * 1988-06-06 1989-12-14 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
JPH03182680A (en) * 1989-12-08 1991-08-08 Nissan Motor Co Ltd Securing structure for fuel injection nozzle
EP0735267A2 (en) * 1995-03-30 1996-10-02 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Mounting device of an injection nozzle in particular on the cylinder head of an internal combustion engine
EP0819846A1 (en) * 1996-07-18 1998-01-21 Denso Corporation Fuel injection apparatus having cylinder screw for mounting fuel injector on engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736446A (en) * 1953-04-15 1955-09-07 Cav Ltd Liquid fuel injection nozzle holders for internal combustion engines
GB774206A (en) * 1953-08-28 1957-05-08 Maschf Augsburg Nuernberg Ag Improvements in and relating to fuel injection nozzles for internal combustion engines
GB1148012A (en) * 1966-02-07 1969-04-10 Ustav Pro Vyzkum Motorovych Vo Improvements in or relating to draining of excess fuel from fuel injectors of internal combustion compression ignition engines
DE3908796A1 (en) * 1988-06-06 1989-12-14 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
JPH03182680A (en) * 1989-12-08 1991-08-08 Nissan Motor Co Ltd Securing structure for fuel injection nozzle
EP0735267A2 (en) * 1995-03-30 1996-10-02 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Mounting device of an injection nozzle in particular on the cylinder head of an internal combustion engine
EP0819846A1 (en) * 1996-07-18 1998-01-21 Denso Corporation Fuel injection apparatus having cylinder screw for mounting fuel injector on engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 432 (M - 1175) 5 November 1991 (1991-11-05) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005054661A1 (en) * 2003-12-05 2005-06-16 Siemens Aktiengesellschaft Injector comprising a clamping device to be mounted in a cylinder head, and clamping device

Also Published As

Publication number Publication date
JP2001173542A (en) 2001-06-26
DE19954065A1 (en) 2001-05-23

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