EP1108886A2 - Common rail fuel injection system - Google Patents

Common rail fuel injection system Download PDF

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Publication number
EP1108886A2
EP1108886A2 EP00124776A EP00124776A EP1108886A2 EP 1108886 A2 EP1108886 A2 EP 1108886A2 EP 00124776 A EP00124776 A EP 00124776A EP 00124776 A EP00124776 A EP 00124776A EP 1108886 A2 EP1108886 A2 EP 1108886A2
Authority
EP
European Patent Office
Prior art keywords
rail
cylinder head
pressure pipe
injector
claw
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
EP00124776A
Other languages
German (de)
French (fr)
Other versions
EP1108886A3 (en
EP1108886B1 (en
Inventor
Heribert Dipl.-Ing. Möller (FH)
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
Publication of EP1108886A2 publication Critical patent/EP1108886A2/en
Publication of EP1108886A3 publication Critical patent/EP1108886A3/en
Application granted granted Critical
Publication of EP1108886B1 publication Critical patent/EP1108886B1/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
    • F02M55/02—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
    • 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
    • F02M55/025—Common rails
    • 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 a common rail injection system according to the generic term of claim 1.
  • a common rail injection system is known from DE 197 54 132 A1, in which an injector located in the cylinder axis centrally in the cylinder head.
  • the connection the injector with the fuel-carrying rail is manufactured using a pressure pipe, which is arranged in a bore lying transversely in the cylinder head.
  • the Pressure pipe has sealing surfaces on both ends by means of a claw and a screw in the cylinder head can be kept under tension.
  • the claw itself has a hole and is connected to the rail by a screw connection.
  • the screw connection has a right and a ends left-handed thread.
  • the invention has for its object the connection of common rail and injector with as few components as possible and as easy to assemble as possible.
  • the task is on the one hand by the characterizing features of the claim 1 solved.
  • the structural unity of the rail and the claw means that fewer parts are required and that Assembly easier.
  • the fuel takes the shortest route and is straight to the injector, causing reflections of pressure waves at deflections and the like be avoided.
  • FIG. 1 shows a side view of a cylinder head 1.
  • a rail 2 is attached to this directly attached with screws 3 and 4 claws.
  • the claws 4 assigned to each injector 5 with the rail 3 form a structural unit, for example a forged part. This is described in more detail in FIG. 2.
  • Figure 2 shows a section II-II of Figure 3.
  • the injector 5 is located in a bore of the cylinder head 1.
  • a flow limiter 7, which inserts with thread 8 Rail 2 is screwed in.
  • the rail 2 is directly on the cylinder head 1 with a screw 3 attached.
  • the attachment serve each injector 5 (Fig. 1) a claw 4 with the Rail 2 is combined into a structural unit.
  • Rail 2 and the claws 4 can advantageously be designed as a forged part.
  • FIG. 3 shows a top view of part of the cylinder head 1.
  • the rail 2 is per injector 5 directly attached to the cylinder head 1 by means of screw 3 and claw 4.
  • the Fuel is supplied from the rail 2 to the injector through the pressure pipe 6 (FIG. 2), which is only indicated here by a dashed line.
  • FIG. 4 An end view is shown in FIG. 4.
  • the rail 2 forms a structural one with the claw 4 Unit that is attached to cylinder head 1 with screw 3.
  • the structural unit of Rail 2 and the claws 4 means a lot of assembly work saved and the fuel goes from Rail 2 to the injectors in the shortest possible way 5.
  • the Rail 2 can also be used with single claws 4 am Cylinder head to be attached. An advantage of this attachment can be seen in this be that the rail 2 can remain unchanged.

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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 supply rail (2) is directly fastened to the cylinder head (1) via a sealing bracket (4), sealing the ends of a pressure tube (6), and a screw (3) fastening the brackets to the cylinder head. Rail and screw form a modular unit, e.g. a forged part. A flow limiter (7) is located between rail and pressure tube, and is screwed with a thread (8) into the rail, while it is sealed via a conical seat relative to the tube.

Description

Die Erfindung bezieht sich auf ein Common Rail Einspritzsystem gemäß dem Gattungsbegriff des Patentanspruches 1.The invention relates to a common rail injection system according to the generic term of claim 1.

Aus DE 197 54 132 A1 ist ein Common Rail Einspritzsystem bekannt, bei dem ein Injektor in Zylinderachse liegend zentral im Zylinderkopf angeordnet ist. Die Verbindung des Injektors mit dem treibstofführenden Rail wird über ein Druckrohr hergestellt, welches in einer quer im Zylinderkopf liegenden Bohrung angeordnet ist. Das Druckrohr weist an seinen beiden Enden Dichtflächen auf die mittels einer Pratze und einer Schraube im Zylinderkopf unter Spannung gehalten werden. Die Pratze selbst weist eine Bohrung auf und ist über eine Verschraubung mit dem Rail verbunden. Zur leichteren Montage weist die Verschraubung an seinen Enden ein rechts- und ein linksgängiges Gewinde auf. Bei einem Einspritzsystem der genannten Art sind mehrere Bauteile erforderlich und die Pratzen benötigen eine abgewinkelte Bohrung die zu unerwünschten Reflexionen von Druckwellen Anlaß geben kann.A common rail injection system is known from DE 197 54 132 A1, in which an injector located in the cylinder axis centrally in the cylinder head. The connection the injector with the fuel-carrying rail is manufactured using a pressure pipe, which is arranged in a bore lying transversely in the cylinder head. The Pressure pipe has sealing surfaces on both ends by means of a claw and a screw in the cylinder head can be kept under tension. The claw itself has a hole and is connected to the rail by a screw connection. For For easier assembly, the screw connection has a right and a ends left-handed thread. There are several in an injection system of the type mentioned Components required and the claws require an angled hole which is undesirable Reflections from pressure waves can give rise to.

Der Erfindung liegt die Aufgabe zugrunde die Verbindung von Common Rail und Injektor mit möglichst wenigen Bauteilen und so montagefreundlich als möglich zu gestalten.The invention has for its object the connection of common rail and injector with as few components as possible and as easy to assemble as possible.

Die Aufgabe wird zum einen durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. The task is on the one hand by the characterizing features of the claim 1 solved.

Durch die bauliche Einheit von Rail und Pratze werden weniger Teile benötigt und die Montage erleichtert. Zudem gelangt der Treibstoff auf den kürzesten Weg und geradlinig zum Injektor, wodurch Reflexionen von Druckwellen an Umlenkungen und dergleichen vermieden werden.The structural unity of the rail and the claw means that fewer parts are required and that Assembly easier. In addition, the fuel takes the shortest route and is straight to the injector, causing reflections of pressure waves at deflections and the like be avoided.

Die gleiche Aufgabe kann zum anderen durch die kennzeichnenden Merkmale des Patentanspruches 2 gelöst werden.The same task can be achieved by the characterizing features of the claim 2 can be solved.

Der Vorteil dieser Anordnung ist darin zu sehen, daß das übliche Rail in unveränderter Form beibehalten werden kann. Die Befestigung am Zylinderkopf erfolgt durch separate Pratzen. Die direkte Verbindung vom Rail über das Druckrohr zum Injektor bleibt jedoch unverändert erhalten.The advantage of this arrangement is the fact that the usual rail in unchanged Shape can be maintained. The attachment to the cylinder head is done by separate Claws. The direct connection from the rail via the pressure pipe to the injector remains unchanged, however.

Eine vorteilhafte Weiterbildung ist Anspruch 3 zu entnehmen.An advantageous further development can be found in claim 3.

Bei Anwendung eines Durchflußbegrenzers kann dieser unmittelbar ins Rail eingeschraubt werden. Der Kraftstoff gelangt aber auf direktem Weg zum Injektor.When using a flow restrictor, it can be screwed directly into the rail become. However, the fuel reaches the injector directly.

Ein Ausführungsbeispiel der Erfindung ist an Hand von Zeichnungen dargestellt. Es zeigt:

Fig. 1
eine Seitenansicht eines Zylinderkopfes mit daran befestigtem Rail
Fig. 2
einen Schnitt II-II aus Fig. 3 mit Rail und Injektor
Fig. 3
eine Draufsicht auf den Zylinderkopf mit daran befestigtem Rail
Fig. 4
eine Stirnansicht des Zylinderkopfes mit seitlich per Schrauben befestigtem Rail
An embodiment of the invention is illustrated with reference to drawings. It shows:
Fig. 1
a side view of a cylinder head with attached rail
Fig. 2
a section II-II of Fig. 3 with rail and injector
Fig. 3
a plan view of the cylinder head with the rail attached
Fig. 4
an end view of the cylinder head with rail attached laterally by screws

Figur 1 zeigt eine Seitenansicht eines Zylinderkopfes 1. An diesem wird ein Rail 2 unmittelbar mittels Schrauben 3 und Pratzen 4 befestigt. Im dargestellten Beispiel bil den die jedem Injektor 5 zugeordneten Pratzen 4 mit dem Rail-3 eine bauliche Einheit, zum Beispiel ein Schmiedeteil. Dieses ist in Figur 2 näher beschrieben.FIG. 1 shows a side view of a cylinder head 1. A rail 2 is attached to this directly attached with screws 3 and 4 claws. In the example shown bil the claws 4 assigned to each injector 5 with the rail 3 form a structural unit, for example a forged part. This is described in more detail in FIG. 2.

Figur 2 stellt einen Schnitt II-II nach Figur 3 dar. In der Verlängerung der Zylinderachse befindet sich der Injektor 5 in einer Bohrung des Zylinderkopfes 1. Die Treibstoffzufuhr zum Injektor 5 erfolgt über das Rail 2 und ein Druckrohr 6, welches in einer Bohrung quer durch den Zylinderkopf 1 angeordnet ist. Zur Vermeidung größerer Leckageverluste kann ein Durchflußbegrenzer 7 vorgesehen, der mit Gewinde 8 ins Rail 2 eingeschraubt ist.Figure 2 shows a section II-II of Figure 3. In the extension of the cylinder axis the injector 5 is located in a bore of the cylinder head 1. The fuel supply to the injector 5 via the rail 2 and a pressure pipe 6, which in a Bore is arranged across the cylinder head 1. To avoid bigger ones Leakage losses can be provided by a flow limiter 7, which inserts with thread 8 Rail 2 is screwed in.

Erfindungsgemäß ist das Rail 2 mit einer Schraube 3 unmittelbar am Zylinderkopf 1 befestigt. Der Befestigung dienen je Injektor 5 ( Fig. 1 ) eine Pratze 4 die mit dem Rail 2 zu einer baulichen Einheit zusammengefaßt ist. Rail 2 und die Pratzen 4 können vorteilhafterweise als ein Schmiedeteil ausgebildet sein. Um der Pratze 4 und dem Rail 2 eine gewisse sphärische Bewegungsmöglichkeit einzuräumen ist ein Gegenlager am Zylinderkopf als Kalotte 9 ausgebildet.According to the invention, the rail 2 is directly on the cylinder head 1 with a screw 3 attached. The attachment serve each injector 5 (Fig. 1) a claw 4 with the Rail 2 is combined into a structural unit. Rail 2 and the claws 4 can advantageously be designed as a forged part. To the claw 4 and the Giving rail 2 a certain spherical possibility of movement is a counter bearing formed on the cylinder head as a cap 9.

Eine Draufsicht auf einen Teil des Zylinderkopfes 1 zeigt Fig. 3. Das Rail 2 ist je Injektor 5 mittels Schraube 3 und Pratze 4 unmittelbar am Zylinderkopf 1 befestigt. Die Treibstoffzufuhr vom Rail 2 zum Injektor erfolgt durch das Druckrohr 6 ( Fig. 2 ), welches hier nur durch eine strichlierte Linie angedeutet ist.3 shows a top view of part of the cylinder head 1. The rail 2 is per injector 5 directly attached to the cylinder head 1 by means of screw 3 and claw 4. The Fuel is supplied from the rail 2 to the injector through the pressure pipe 6 (FIG. 2), which is only indicated here by a dashed line.

Eine stirnseitige Ansicht zeigt Figur 4. Das Rail 2 bildet mit der Pratze 4 eine bauliche Einheit die mit Schraube 3 am Zylinderkopf 1 befestigt wird.An end view is shown in FIG. 4. The rail 2 forms a structural one with the claw 4 Unit that is attached to cylinder head 1 with screw 3.

Durch die bauliche Einheit von Rail 2 und den Pratzen 4 wird viel Montageaufwand eingespart und der Treibstoff gelangt auf kürzestem Weg vom Rail 2 zu den Injektoren 5.The structural unit of Rail 2 and the claws 4 means a lot of assembly work saved and the fuel goes from Rail 2 to the injectors in the shortest possible way 5.

Wenn es besondere Umstände erfordern kann das Rail 2 auch mit Einzelpratzen 4 am Zylinderkopf befestigt werden. Ein Vorteil dieser Befestigung kann darin gesehen werden, daß das Rail 2 unverändert bleiben kann.If special circumstances require it, the Rail 2 can also be used with single claws 4 am Cylinder head to be attached. An advantage of this attachment can be seen in this be that the rail 2 can remain unchanged.

Claims (3)

Common Rail Einspritzsystem, bestehend aus einem im Zylinderkopf angeordneten Injektor, einem Rail für die Kraftstoffzufuhr und einem Druckrohr welches das Rail und den Injektor verbindet, wobei das Druckrohr durch eine Bohrung im Zylinderkopf geführt wird und die Abdichtung an beiden Enden des Druckrohres durch den Druck einer Pratze erreicht wird, welche mittels Schraube am Zylinderkopf befestigt ist, dadurch gekennzeichnet, daß das Rail (2) unmittelbar mit der Schraube (3) und Pratze (4) am Zylinderkopf (1) befestigt ist, und daß Rail (2) und Pratze (3) eine bauliche Einheit, beispielsweise ein Schmiedestück bilden.Common rail injection system, consisting of one arranged in the cylinder head Injector, a rail for the fuel supply and a pressure pipe which connects the rail and the injector, the pressure pipe through a Bore in the cylinder head and the seal at both ends of the pressure pipe is achieved by the pressure of a claw, which by means of Screw is attached to the cylinder head, characterized in that the Rail (2) directly with the screw (3) and claw (4) on the cylinder head (1) is attached, and that rail (2) and claw (3) a structural unit, for example to make a forge. Common Rail Einspritzsystem, bestehend aus einem im Zylinderkopf angeordneten Injektor, einem Rail für die Kraftstoffzufuhr und einem Druckrohr welches das Rail und den Injektor verbindet, wobei das Druckrohr durch eine Bohrung im Zylinderkopf geführt wird und die Abdichtung an beiden Enden des Druckrohres durch den Druck einer Pratze erreicht wird, welche mittels Schraube am Zylinderkopf befestigt ist, dadurch gekennzeichnet, daß das Rail (2) unmittelbar am Zylinderkopf (1) befestigt ist und daß das Rail (2) durch eine separate Pratze (4) und Schraube (3) am Zylinderkopf (1) befestigt ist.Common rail injection system, consisting of one arranged in the cylinder head Injector, a rail for the fuel supply and a pressure pipe which connects the rail and the injector, the pressure pipe through a Bore in the cylinder head and the seal at both ends of the pressure pipe is achieved by the pressure of a claw, which by means of Screw is attached to the cylinder head, characterized in that the rail (2) is attached directly to the cylinder head (1) and that the rail (2) by a separate claw (4) and screw (3) is attached to the cylinder head (1). Common Rail nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß zwischen Rail (2) und Druckrohr (6) ein Durchflußbegrenzer (7) angeordnet ist, und daß der Durchflußbegrenzer (7) mit Gewinde (8) in das Rail (2) eingeschraubt ist, während er gegen das Druckrohr (6) durch einen Kegelsitz abgedichtet ist.Common rail according to claims 1 and 2, characterized in that a flow limiter (7) is arranged between the rail (2) and the pressure pipe (6) and that the flow limiter (7) with thread (8) is screwed into the rail (2) is sealed against the pressure pipe (6) by a conical seat is.
EP00124776A 1999-12-15 2000-11-14 Common rail fuel injection system Expired - Lifetime EP1108886B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19960480 1999-12-15
DE19960480A DE19960480A1 (en) 1999-12-15 1999-12-15 Common rail injection system

Publications (3)

Publication Number Publication Date
EP1108886A2 true EP1108886A2 (en) 2001-06-20
EP1108886A3 EP1108886A3 (en) 2003-11-26
EP1108886B1 EP1108886B1 (en) 2005-01-19

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ID=7932750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124776A Expired - Lifetime EP1108886B1 (en) 1999-12-15 2000-11-14 Common rail fuel injection system

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EP (1) EP1108886B1 (en)
DE (2) DE19960480A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009033304A1 (en) 2007-09-13 2009-03-19 Ganser-Hydromag Ag Fuel injection device
WO2009058283A1 (en) * 2007-10-29 2009-05-07 Caterpillar Inc. Fuel system having a one-piece hollow tube connection
EP2060776A1 (en) * 2007-11-13 2009-05-20 Delphi Technologies, Inc. Fuel lance

Citations (1)

* 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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539959A (en) * 1984-02-27 1985-09-10 General Motors Corporation Fuel injection system with fuel flow limiting valve assembly
JP3371620B2 (en) * 1995-05-29 2003-01-27 いすゞ自動車株式会社 Common rail fuel injector
DE19640480B4 (en) * 1996-09-30 2004-04-22 Robert Bosch Gmbh High-pressure fuel storage

Patent Citations (1)

* 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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009033304A1 (en) 2007-09-13 2009-03-19 Ganser-Hydromag Ag Fuel injection device
US8336524B2 (en) 2007-09-13 2012-12-25 Ganser-Hydromag Ag Fuel injection device
WO2009058283A1 (en) * 2007-10-29 2009-05-07 Caterpillar Inc. Fuel system having a one-piece hollow tube connection
EP2060776A1 (en) * 2007-11-13 2009-05-20 Delphi Technologies, Inc. Fuel lance
JP2009138738A (en) * 2007-11-13 2009-06-25 Delphi Technologies Inc Fuel lance and assembly
EP2060775A3 (en) * 2007-11-13 2009-11-11 Delphi Technologies, Inc. Fuel lance and assembly
US7958870B2 (en) 2007-11-13 2011-06-14 Delphi Technologies Holdings S.arl Fuel lance and assembly
JP2011127612A (en) * 2007-11-13 2011-06-30 Delphi Technologies Holding Sarl Fuel lance and assembly

Also Published As

Publication number Publication date
EP1108886A3 (en) 2003-11-26
EP1108886B1 (en) 2005-01-19
DE19960480A1 (en) 2001-06-21
DE50009273D1 (en) 2005-02-24

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