DE19601496A1 - Pipe union to pressure pipe of IC-engine fuel-injector - Google Patents

Pipe union to pressure pipe of IC-engine fuel-injector

Info

Publication number
DE19601496A1
DE19601496A1 DE1996101496 DE19601496A DE19601496A1 DE 19601496 A1 DE19601496 A1 DE 19601496A1 DE 1996101496 DE1996101496 DE 1996101496 DE 19601496 A DE19601496 A DE 19601496A DE 19601496 A1 DE19601496 A1 DE 19601496A1
Authority
DE
Germany
Prior art keywords
pressure pipe
claw
pipe
cylinder head
injection line
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.)
Granted
Application number
DE1996101496
Other languages
German (de)
Other versions
DE19601496C2 (en
Inventor
Friedrich Dipl Ing Bauer
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
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 MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Priority to DE1996101496 priority Critical patent/DE19601496C2/en
Publication of DE19601496A1 publication Critical patent/DE19601496A1/en
Application granted granted Critical
Publication of DE19601496C2 publication Critical patent/DE19601496C2/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or 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
    • 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
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • 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

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

The pressure pipe passes through a bore in the cylinder head and delivers into the injector at the side of the latter, being sealed via cone seats at the ends to the injector an injection pipe (3). The free end of the latter forms a sealing cone head (10). This is pressed by a clamp strap (7) screwed to the cylinder head (1) against the pressure pipe (4). The strap contains a recess (9) through which the injection pipe passes, and a clamping washer (6) is fitted between the strap and the cone head. The washer can have taper bore (11) at the side towards the strap, and there can be a sealing O-ring (5) between the pressure pipe and cylinder head, mounted on the pipe end nearest to the strap.

Description

Die Erfindung bezieht sich auf einen Anschluß einer Einspritzleitung gemäß dem Gattungsbegriff des Patentanspruches 1.The invention relates to a connection of an injection line according to the Generic term of patent claim 1.

Nach Patentanmeldung 195 43 506 wird zum seitlichen Anschluß einer Einspritz­ leitung an ein Einspritzventil vorgeschlagen, die Einspritzleitung nahezu parallel zu ei­ ner Zylinderachse an den Zylinderkopf heranzuführen und dann unter Zwischenschal­ tung eines abgewinkelten Anschlußstückes mit einem Druckrohr zu verbinden. Zur Führung des Brennstoffes weist das Anschlußstück eine Bohrung auf. Um nun das An­ schlußstuck gegen die Einspritzleitung einerseits und gegen das Druckrohr andererseits abzudichten wird die Einspritzleitung mittels Überwurfmutter mit der Pratze verbun­ den. Das Anschlußstück wiederum wird mit der Pratze gegen das Druckrohr gepreßt. Ein derartiger Anschluß bedarf zweier kurz hintereinander liegender Dichtstellen, was das Risiko einer Undichtheit beinhaltet.According to patent application 195 43 506 for the lateral connection of an injection Line proposed to an injection valve, the injection line almost parallel to egg ner cylinder axis to the cylinder head and then under intermediate scarf device to connect an angled connector with a pressure pipe. For Guiding the fuel, the connector has a bore. Now to the An final piece against the injection line on the one hand and against the pressure pipe on the other the injection line is connected to the claw by means of a union nut the. The connector in turn is pressed against the pressure pipe with the claw. Such a connection requires two sealing points in quick succession, what involves the risk of leakage.

Ausgehend von einem derartigen Anschluß liegt der Erfindung die Aufgabe zugrunde, die Anzahl der Dichtstellen zu vermindern, ohne den seitlichen Bauraum nennenswert zu vergrößern.Starting from such a connection, the invention is based on the object to reduce the number of sealing points without noteworthy the lateral installation space to enlarge.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspru­ ches 1.This object is achieved by the characterizing features of the patent claim ches 1.

Dadurch, daß die Einspritzleitung durch eine Ausnehmung der Pratze geführt und durch diese unmittelbar unter Zwischenschaltung eines Dichtkegels und einer Spannscheibe gegen ein Druckrohr gepreßt wird spart man die Dichtstelle zwischen Anschlußstück und Einspritzleitung ein.Characterized in that the injection line is guided through a recess in the claw and through this directly with the interposition of a sealing cone and a  Clamping disc is pressed against a pressure pipe, you save the sealing point between Connector and injection line.

Es ist ohne weiteres einzusehen, daß durch Einsparung dieser Dichtstelle das Risiko einer Undichtheit gemindert wird.It is easy to see that by saving this sealing point the risk a leak is reduced.

Vorteilhafte Weiterbildungen sind den Unteransprüchen 2 und 3 zu entnehmen.Advantageous further developments can be found in subclaims 2 and 3.

Ein Ausführungsbeispiel der Erfindung ist in Zeichnungen dargestellt. Es zeigt:An embodiment of the invention is shown in drawings. It shows:

Fig. 1 einen Schnitt durch einen Zylinderkopf mit Einspritzventil, Druckrohr und dem Anschluß der Einspritzleitung an das Druckrohr mittels einer Pratze;1 shows a section through a cylinder head with a fuel injection valve, pressure pipe and the connection of the injection pipe to the pressure pipe by means of a claw.

Fig. 2 eine stirnseitige Ansicht der Pratze mit Ausnehmung für die Durchführung der Einspritzleitung; Figure 2 is an end view of the claw with recess for the implementation of the injection line.

Fig. 3 einen Schnitt im Bereich des freien Endes der Einspritzleitung. Fig. 3 shows a section in the region of the free end of the injection line.

Fig. 1 zeigt einen Zylinderkopf 1 mit Einspritzventil 2. Zur Brennstoffzufuhr wird ei­ ne Einspritzleitung 3 unter Zwischenschaltung eines Druckrohres 4 seitlich am Zylin­ derkopf 1 angeschlossen. Das Druckrohr 4 weist am einspritzdüsenseitigen Ende eine ballige Dichtfläche auf, welche mit einer kegeligen Dichtfläche am Einspritzventil 2 korrespondiert. Die Abdichtung der Einspritzleitung 3 gegen das Druckrohr 4 erfolgt mittels Dichtkegel 10, welcher unter Zwischenschaltung einer Spannscheibe 6 durch die Pratze 7 angepreßt wird. Die Anpreßkraft der Pratze 7 wird durch eine in den Zylinderkopf eingeschraubte Schraube 8 aufgebracht. Zur Durchführung der Einspritzleitung 3 durch die Pratze 7 weist diese eine Ausnehmung 9 auf. Die Einspritzleitung 3 wird zunächst achsparallel zu einem Zylinder geführt und dann in einem Rohrbogen 3a seitlich an das Druckrohr 4 herangeführt. Dadurch, daß die Einspritzleitung unmittel­ bar in das Druckrohr 4 einmündet wird eine Dichtstelle eingespart. Bei genügend klei­ nem Radius des Rohrbogens 3a wird ebenfalls nur wenig seitlicher Bauraum bean­ sprucht. Fig. 1 shows a cylinder head 1 having injection valve 2. For fuel supply, ei ne injection line 3 with the interposition of a pressure pipe 4 is connected laterally to the cylinder head 1 . The pressure pipe 4 has a spherical sealing surface at the injection nozzle end, which corresponds to a conical sealing surface on the injection valve 2 . The injection line 3 is sealed off from the pressure pipe 4 by means of a sealing cone 10 , which is pressed by the claw 7 with the interposition of a tensioning disk 6 . The contact force of the claw 7 is applied by a screw 8 screwed into the cylinder head. For the passage of the injection line 3 through the claw 7 , this has a recess 9 . The injection line 3 is first passed axially into a cylinder and then introduced in a tube sheet 3 a side of the pressure pipe. 4 The fact that the injection line opens directly into the pressure pipe 4 saves a sealing point. If the radius of the pipe bend 3 a is sufficiently small, only little lateral installation space is also required.

Eine stirnseitige Ansicht auf die Pratze 7 zeigt Fig. 2. Die Pratze 7 hat erfindungs­ gemäß die Ausnehmung 9, durch die die Einspritzleitung 3 hindurchgeführt wird. Die Schraube 8 sorgt für die Verspannung der Pratze 7 gegen den Zylinderkopf 1 (Fig. 1).An end view of the claw 7 is shown in FIG. 2. The claw 7 has, according to the invention, the recess 9 through which the injection line 3 is passed. The screw 8 ensures the bracing of the claw 7 against the cylinder head 1 ( FIG. 1).

Eine detaillierte Darstellung des freien Endes der Einspritzleitung 3 ist in Fig. 3 dar­ gestellt. Der Dichtkegel 10 wird mittels der Pratze 7 (Fig. 1) unter Zwischenschaltung der Spannscheibe 6 gegen das Druckrohr 4 gepreßt. Die Abdichtung des Druckroh­ res 4 gegen den Zylinderkopf 1 (Fig. 1) erfolgt durch einen O-Ring 5. Die Spann­ scheibe 6 wird vorteilhafterweise mit einer kegeligen Bohrung 11 für die Durch­ fuhrung der Einspritzleitung 3 versehen. Durch die kegelige Bohrung 11 ist man in der Lage, den Krümmungsradius r des Rohrbogens 3a möglichst klein zu halten, ohne daß es zu Zwängungen kommt.A detailed representation of the free end of the injection line 3 is shown in FIG. 3. The sealing cone 10 is pressed against the pressure pipe 4 by means of the claw 7 ( FIG. 1) with the interposed spring washer 6 . The pressure tube 4 is sealed against the cylinder head 1 ( FIG. 1) by an O-ring 5 . The clamping disc 6 is advantageously provided with a tapered bore 11 for the passage of the injection line 3 . Through the tapered bore 11 , one is able to keep the radius of curvature r of the pipe bend 3 a as small as possible without causing constraints.

Claims (3)

1. Anschluß einer Einspritzleitung an ein Druckrohr eines Einspritzventils, bei dem das Druckrohr einen Zylinderkopf in einer axialen Bohrung durchdringt und seitlich in das Einspritzventil mündet und das Druckrohr an seinen freien Enden einerseits gegen das Einspritzventil und anderer­ seits gegen ein freies Ende der Einspritzleitung mittels kegeliger Dicht­ sitze abgedichtet ist, dadurch gekennzeichnet, daß das freie Ende der Einspritzleitung (3) als Dichtkegel (10) ausgebildet ist, daß dieser Dicht­ kegel (10) mittels einer mit dem Zylinderkopf (1) verschraubten Pratze (7) gegen des Druckrohr (4) gepreßt wird, wobei die Pratze (7) zur Durch­ führung der Einspritzleitung (3) eine Ausnehmung (9) aufweist, und daß zwischen Pratze (7) und Dichtkegel (10) eine Spannscheibe (6) einge­ schaltet ist.1.Connection of an injection line to a pressure pipe of an injection valve, in which the pressure pipe penetrates a cylinder head in an axial bore and opens laterally into the injection valve and the pressure pipe at its free ends, on the one hand, against the injection valve and, on the other hand, against a free end of the injection line by means of a conical one Sealing is sealed, characterized in that the free end of the injection line ( 3 ) is designed as a sealing cone ( 10 ), that this sealing cone ( 10 ) by means of a claw ( 7 ) screwed to the cylinder head ( 1 ) against the pressure pipe ( 4 ) is pressed, the claw ( 7 ) for guiding the injection line ( 3 ) has a recess ( 9 ), and that between the claw ( 7 ) and the sealing cone ( 10 ) a clamping washer ( 6 ) is switched on. 2. Anschluß nach Anspruch 1, dadurch gekennzeichnet, daß die Spann­ scheibe (6) auf der, der Pratze (7) zugewandten Seite eine kegelige Boh­ rung (11) aufweist.2. Connection according to claim 1, characterized in that the clamping disc ( 6 ) on the, the claw ( 7 ) facing side has a tapered Boh tion ( 11 ). 3. Anschluß nach Anspruch 1, dadurch gekennzeichnet, daß die Abdichtung des Druckrohres (4) gegen Zylinderkopf (1) durch einen O-Ring (5) erfolgt und daß dieser O-Ring (5) am pratzenseitigen Ende des Druckrohres (4) angeordnet ist.3. Connection according to claim 1, characterized in that the sealing of the pressure tube ( 4 ) against the cylinder head ( 1 ) by an O-ring ( 5 ) and that this O-ring ( 5 ) is arranged on the claw-side end of the pressure tube ( 4 ) is.
DE1996101496 1996-01-17 1996-01-17 Connection of an injection line to a pressure pipe of an injection valve Revoked DE19601496C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996101496 DE19601496C2 (en) 1996-01-17 1996-01-17 Connection of an injection line to a pressure pipe of an injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996101496 DE19601496C2 (en) 1996-01-17 1996-01-17 Connection of an injection line to a pressure pipe of an injection valve

Publications (2)

Publication Number Publication Date
DE19601496A1 true DE19601496A1 (en) 1997-07-24
DE19601496C2 DE19601496C2 (en) 1998-07-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE1996101496 Revoked DE19601496C2 (en) 1996-01-17 1996-01-17 Connection of an injection line to a pressure pipe of an injection valve

Country Status (1)

Country Link
DE (1) DE19601496C2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754132A1 (en) * 1997-12-05 1999-06-10 Man Nutzfahrzeuge Ag Common rail injection system for internal combustion engines
DE102006053028A1 (en) * 2006-11-10 2008-05-15 Man Diesel Se Fuel supply system i.e. common rail fuel supply system for ship-diesel internal-combustion engine, has recess of pressure screws of curved fuel pipe exhibiting expansion at end, which is opposite to end having external thread
FR2935028A1 (en) * 2008-08-18 2010-02-19 Renault Sas Pressurized fuel i.e. petrol, injecting device for direct injection type combustion engine of motor vehicle, has clamp for transmitting flexion effort directly to cylinder head or cylinder head cover, without stressing injection unit
EP2284385A1 (en) * 2009-07-07 2011-02-16 Continental Automotive GmbH Fuel rail device and coupling assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT214210B (en) * 1960-01-15 1961-03-27 Steyr Daimler Puch Ag Sealing of wall openings in crankshafts, gear housings or the like for the implementation of unmoving parts such as lines
DD214895A1 (en) * 1983-04-26 1984-10-24 Skl Magdeburg Veb COOLED FUEL INJECTION VALVE FOR FOUR-STROKE THYLE ENGINES
DE4239173C1 (en) * 1992-11-21 1993-09-02 Mercedes-Benz Aktiengesellschaft, 70327 Stuttgart, De Cylinder-head for fuel-injection engine - has pressure pipe passing through clamping screw and with union at protruding end for injection pipe
DE19543506A1 (en) * 1995-11-22 1997-05-28 Man Nutzfahrzeuge Ag Injection line connection to compression tube of injection valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT214210B (en) * 1960-01-15 1961-03-27 Steyr Daimler Puch Ag Sealing of wall openings in crankshafts, gear housings or the like for the implementation of unmoving parts such as lines
DD214895A1 (en) * 1983-04-26 1984-10-24 Skl Magdeburg Veb COOLED FUEL INJECTION VALVE FOR FOUR-STROKE THYLE ENGINES
DE4239173C1 (en) * 1992-11-21 1993-09-02 Mercedes-Benz Aktiengesellschaft, 70327 Stuttgart, De Cylinder-head for fuel-injection engine - has pressure pipe passing through clamping screw and with union at protruding end for injection pipe
DE19543506A1 (en) * 1995-11-22 1997-05-28 Man Nutzfahrzeuge Ag Injection line connection to compression tube of injection valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIN 73365, Blatt 3, Jan. 1970, Form R Druckrohranschluß mit Rohrdichtkegel (R) und Druckscheibe *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754132A1 (en) * 1997-12-05 1999-06-10 Man Nutzfahrzeuge Ag Common rail injection system for internal combustion engines
DE19754132B4 (en) * 1997-12-05 2005-06-23 Man Nutzfahrzeuge Ag Common Rail injection system for internal combustion engines
DE102006053028A1 (en) * 2006-11-10 2008-05-15 Man Diesel Se Fuel supply system i.e. common rail fuel supply system for ship-diesel internal-combustion engine, has recess of pressure screws of curved fuel pipe exhibiting expansion at end, which is opposite to end having external thread
FR2935028A1 (en) * 2008-08-18 2010-02-19 Renault Sas Pressurized fuel i.e. petrol, injecting device for direct injection type combustion engine of motor vehicle, has clamp for transmitting flexion effort directly to cylinder head or cylinder head cover, without stressing injection unit
EP2284385A1 (en) * 2009-07-07 2011-02-16 Continental Automotive GmbH Fuel rail device and coupling assembly

Also Published As

Publication number Publication date
DE19601496C2 (en) 1998-07-30

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8363 Opposition against the patent
8331 Complete revocation