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EP0921303A2 - Common rail fuel injection system for internal combustion engines - Google Patents

Common rail fuel injection system for internal combustion engines Download PDF

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Publication number
EP0921303A2
EP0921303A2 EP98119363A EP98119363A EP0921303A2 EP 0921303 A2 EP0921303 A2 EP 0921303A2 EP 98119363 A EP98119363 A EP 98119363A EP 98119363 A EP98119363 A EP 98119363A EP 0921303 A2 EP0921303 A2 EP 0921303A2
Authority
EP
European Patent Office
Prior art keywords
claw
injector
common rail
memory
injection system
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
EP98119363A
Other languages
German (de)
French (fr)
Other versions
EP0921303A3 (en
EP0921303B1 (en
Inventor
Heribert Dipl.-Ing. Möller (FH)
Manfred Dipl.-Ing. Pister (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 EP0921303A2 publication Critical patent/EP0921303A2/en
Publication of EP0921303A3 publication Critical patent/EP0921303A3/en
Application granted granted Critical
Publication of EP0921303B1 publication Critical patent/EP0921303B1/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
    • F02M55/025—Common rails
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • 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

Definitions

  • the invention relates to a common rail injection system according to the generic term of claim 1.
  • Common rail injection systems usually consist of a pump, an accumulator and at least one injector per cylinder.
  • the memory and the injectors are connected to each other via injection lines.
  • the memory must be special Elements are attached to the cylinder head and the injection lines represent a special assembly effort.
  • the invention has for its object the structural effort for the connection to minimize memory and injectors.
  • the direct connection of the accumulator to the claw eliminates the injection lines. This saves assembly effort and cable breaks are avoided.
  • the memory does not need a separate attachment to the Internal combustion engine.
  • the flow restrictor prevents fuel from escaping in the event of a major leakage.
  • the injection system according to the invention is made from a pump, not shown here, a memory 1 and injectors, of which only one injector 2 is shown here.
  • the memory 1 is connected directly to a claw 3, which is attached to the cylinder head 5 by means of a screw 4.
  • a flow limiter 6 between memory 1 and Claw 3 can be interposed.
  • the claw 3 has an integrated bore 7 for guiding the fuel.
  • a pressure tube 8 is clamped with a bore which Establishes connection from bore 7 to injector 2. Sealing the free Ends of the pressure pipe 8 against the injector 2 on the one hand and against the claw 3 on the other takes place through a crowned surface of the ends of the pressure tube 8 which are pressed against conical sealing seats in injector 2 and claw 3.
  • the crowned surface of the free ends of the pressure tube 8 can this small Execute angular deviations in the direction of the axis of the memory 1 if by thermal expansion of the memory 1 cooled by the fuel compared to the Cylinder head 5 length differences occur.
  • a flow limiter 6 is provided to ensure greater leakage losses which is formed from an adapter sleeve 9, which with the memory 1 and Claw 3 by means of a left-hand thread 10a or a right-hand thread 10b or vice versa connected is.
  • the Spring force acts against the flow direction. Enough in normal operating condition the force of the spring and the back pressure from the injector 1 to the piston 12th to keep against the fuel pressure in the drawn starting position.
  • Of the Fuel passes through the holes in the piston 12 and the hole 7, as well as the pressure pipe 8 to the injector 1.
  • the flow of fuel increases a larger leak significantly compared to full load delivery, so includes Valve seat 13 due to the increased pressure differential against the spring force and locks for the corresponding injector the flow.

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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

A claw (3) with an integrated bore (7) and a pressure tube (8) is screwed to the cylinder head (5) to act as a connecting component. The pressure tube is tensioned between the claw and the injector (2). The accumulator (1) is directly connected to the claw. Between the claw and the accumulator per injector is a through-flow limiter (6).

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.

Common Rail Einspritzsysteme bestehen in der Regel aus einer Pumpe, einem Speicher und mindestens einem Injektor je Zylinder. Der Speicher und die Injektoren werden über Einspritzleitungen untereinander verbunden. Der Speicher muß dabei mit besonderen Elementen am Zylinderkopf befestigt werden und die Einspritzleitungen stellen einen besonderen Montageaufwand dar.Common rail injection systems usually consist of a pump, an accumulator and at least one injector per cylinder. The memory and the injectors are connected to each other via injection lines. The memory must be special Elements are attached to the cylinder head and the injection lines represent a special assembly effort.

Aus DE 195 43 506 A1 ist es bekannt, bei einem konventionellen Einspritzsystem die Einspritzleitung an eine mit einem Zylinderkopf verschraubte Pratze anzuschließen. Die Verbindung von Einspritzleitung und Einspritzdüse erfolgt durch eine in die Pratze integrierte Bohrung und ein Druckrohr, welches zwischen Pratze und Einspritzdüse eingespannt ist. Eine solche Bauart hat den Vorteil, daß die Einspritzleitung etwa parallel zur Zylinderachse geführt werden kann, so daß wenig seitlicher Bauraum erforderlich ist. Die Einspritzleitung selbst ist nicht entbehrlich und stellt einen Montageaufwaud dar und kann Anlaß zu Leitungsbrüchen geben.From DE 195 43 506 A1 it is known that in a conventional injection system Connect the injection line to a claw screwed to a cylinder head. The connection between the injection line and the injection nozzle is made in the claw Integrated bore and a pressure pipe, which is between the claw and the injector is clamped. Such a design has the advantage that the injection line approximately can be guided parallel to the cylinder axis, so that little lateral space is required is. The injection line itself is not unnecessary and requires assembly work and can give rise to line breaks.

Der Erfindung liegt die Aufgabe zugrunde, den baulichen Aufwand für die Verbindung von Speicher und Injektoren zu minimieren.The invention has for its object the structural effort for the connection to minimize memory and injectors.

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

Durch den unmittelbaren Anschluß des Speichers an die Pratze entfallen die Einspritzleitungen. Dadurch wird Montageaufwand gespart und Leitungsbrüche werden vermieden. Der Speicher benötigt auch keine separate Befestigung an der Brennkraftmaschine.The direct connection of the accumulator to the claw eliminates the injection lines. This saves assembly effort and cable breaks are avoided. The memory does not need a separate attachment to the Internal combustion engine.

Eine vorteilhafte Weiterbildung ist Anspruch 2 zu entnehmen.An advantageous further development can be found in claim 2.

Der Durchflußbegrenzer verhindert den Austritt von Brennstoff im Falle einer größerenLeckage.The flow restrictor prevents fuel from escaping in the event of a major leakage.

Ein Ausführungsbeispiel der Erfindung ist an Hand einer Zeichnung dargestellt.An embodiment of the invention is illustrated with the aid of a drawing.

Das erfindungsgemäße Einspritzsystem wird aus einer hier nicht dargestellten Pumpe, einem Speicher 1 und Injektoren gebildet, von dem hier nur ein Injektor 2 gezeigt ist. Der Speicher 1 wird erfindungsgemäß unmittelbar mit einer Pratze 3 verbunden, welche mittels einer Schraube 4 am Zylinderkopf 5 befestigt ist. Lediglich zur Absicherung gegen größere Leckagen kann ein Durchflußbegrenzer 6 zwischen Speicher 1 und Pratze 3 zwischengeschaltet werden.The injection system according to the invention is made from a pump, not shown here, a memory 1 and injectors, of which only one injector 2 is shown here. According to the invention, the memory 1 is connected directly to a claw 3, which is attached to the cylinder head 5 by means of a screw 4. For security purposes only against larger leaks, a flow limiter 6 between memory 1 and Claw 3 can be interposed.

Zur Brennstofführung weist die Pratze 3 eine integrierte Bohrung 7 auf. Zwischen Pratze 3 und Injektor 2 ist ein Druckrohr 8 mit Bohrung eingespannt welches die Verbindung von der Bohrung 7 zum Injektor 2 herstellt. Die Abdichtung der freien Enden des Druckrohres 8 gegen den Injektor 2 einerseits und gegen die Pratze 3 andererseits erfolgt durch eine ballig ausgeführte Oberfläche der Enden des Druckrohres 8 welche gegen kegelige Dichtsitze im Injektor 2 und Pratze 3 gedrückt werden. Durch die ballig gestaltete Oberfläche der freien Enden des Druckrohres 8 kann dieses kleine Winkelabweichungen in Richtung der Achse des Speichers 1 ausführen, wenn durch thermische Dehnung des durch den Brennstoff gekühlten Speichers 1 gegenüber dem Zylinderkopf 5 Längendifferenzen auftreten.The claw 3 has an integrated bore 7 for guiding the fuel. Between Claw 3 and injector 2, a pressure tube 8 is clamped with a bore which Establishes connection from bore 7 to injector 2. Sealing the free Ends of the pressure pipe 8 against the injector 2 on the one hand and against the claw 3 on the other takes place through a crowned surface of the ends of the pressure tube 8 which are pressed against conical sealing seats in injector 2 and claw 3. By the crowned surface of the free ends of the pressure tube 8 can this small Execute angular deviations in the direction of the axis of the memory 1 if by thermal expansion of the memory 1 cooled by the fuel compared to the Cylinder head 5 length differences occur.

Zur Sicherheit gegen größere Leckageverluste ist ein Durchflußbegrenzer 6 vorgesehen welcher aus einer Spannhülse 9 gebildet wird, welche mit dem Speicher 1 und der Pratze 3 mittels eines Linksgewindes 10a bzw. eines Rechtsgewindes 10b oder umgekehrt verbunden ist. Im inneren der Spannhülse 9 befindet sich eine konzentrisch liegende Dichthülse 11, in welcher ein federbelasteter Kolben 12 geführt ist. Die Federkraft wirkt entgegen der Durchflußrichtung. Im normalen Betriebszustand reicht die Kraft der Feder und des Gegendruckes vom Injektor 1 her aus, um den Kolben 12 gegen den Brennstoffdruck in der gezeichneten Ausgangsstellung zu halten. Der Brennstoff gelangt über die Bohrungen im Kolben 12 und die Bohrung 7, sowie über das Druckrohr 8 zum Injektor 1. Vergrößert sich der Durchfluß des Brennstoffes bei einer größeren Leckage wesentlich gegenüber Vollastförderung, so schließt ein Ventilsitz 13 durch die erhöhte Druckdiffererz gegen die Federkraft und sperrt für den entsprechenden Injektor den Durchfluß.A flow limiter 6 is provided to ensure greater leakage losses which is formed from an adapter sleeve 9, which with the memory 1 and Claw 3 by means of a left-hand thread 10a or a right-hand thread 10b or vice versa connected is. Inside the clamping sleeve 9 there is a concentric lying sealing sleeve 11, in which a spring-loaded piston 12 is guided. The Spring force acts against the flow direction. Enough in normal operating condition the force of the spring and the back pressure from the injector 1 to the piston 12th to keep against the fuel pressure in the drawn starting position. Of the Fuel passes through the holes in the piston 12 and the hole 7, as well as the pressure pipe 8 to the injector 1. The flow of fuel increases a larger leak significantly compared to full load delivery, so includes Valve seat 13 due to the increased pressure differential against the spring force and locks for the corresponding injector the flow.

Claims (2)

Common Rail Einspritzsystem für Brennkraftmaschinen, bestehend aus einer Pumpe, einem Speicher und mindestens einem Injektor je Zylinder wobei der Speicher über Verbindungselemente mit den Injektoren verbunden ist, dadurch gekennzeichnet, daß als Verbindungselement eine mit dem Zylinderkopf (5) verschraubte Pratze (3) mit integrierter Bohrung (7) und ein Druckrohr (8) dient, welches zwischen Pratze (3) und Injektor (2) verspannt ist und daß der Speicher (1) direkt an die Pratze (3) angeschlossen ist.Common rail injection system for internal combustion engines, consisting of one pump, one accumulator and at least one injector per cylinder the memory being connected to the injectors via connecting elements is characterized in that as a connecting element with the Cylinder head (5) screwed claw (3) with integrated bore (7) and a pressure pipe (8) is used, which clamps between the claw (3) and the injector (2) and that the memory (1) is connected directly to the claw (3). Common Rail nach Anspruch 1, dadurch gekennzeichnet, daß zwischen Pratze (3) und Speicher (1) je Injektor (2) ein Durchflußbegrenzer (6) angeordhet ist.Common rail according to claim 1, characterized in that between Claw (3) and memory (1) per injector (2) a flow limiter (6) is arranged.
EP19980119363 1997-12-05 1998-10-14 Common rail fuel injection system for internal combustion engines Expired - Lifetime EP0921303B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19754132A DE19754132B4 (en) 1997-12-05 1997-12-05 Common Rail injection system for internal combustion engines
DE19754132 1997-12-05

Publications (3)

Publication Number Publication Date
EP0921303A2 true EP0921303A2 (en) 1999-06-09
EP0921303A3 EP0921303A3 (en) 2003-01-02
EP0921303B1 EP0921303B1 (en) 2005-12-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980119363 Expired - Lifetime EP0921303B1 (en) 1997-12-05 1998-10-14 Common rail fuel injection system for internal combustion engines

Country Status (2)

Country Link
EP (1) EP0921303B1 (en)
DE (2) DE19754132B4 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1108886A3 (en) * 1999-12-15 2003-11-26 Man Nutzfahrzeuge Ag Common rail fuel injection system
EP1793121A1 (en) * 2002-07-01 2007-06-06 Mitsubishi Heavy Industries, Ltd. Fuel injector and diesel engine comprising the same
WO2009033304A1 (en) 2007-09-13 2009-03-19 Ganser-Hydromag Ag Fuel injection device
EP2060776A1 (en) * 2007-11-13 2009-05-20 Delphi Technologies, Inc. Fuel lance
DE102009020867A1 (en) * 2009-05-12 2010-11-18 Bayerische Motoren Werke Aktiengesellschaft Internal-combustion engine e.g. diesel engine, has circularly closed line pressing part formed by contact areas after mounting of fuel injector at fuel rail, where filling end and rail are formed concave and/or convex to each other at areas
AT527267A1 (en) * 2023-10-09 2024-11-15 Avl List Gmbh INTERNAL COMBUSTION ENGINE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10006658B4 (en) * 2000-02-15 2004-08-26 Siemens Ag injection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543506A1 (en) 1995-11-22 1997-05-28 Man Nutzfahrzeuge Ag Injection line connection to compression tube of injection valve

Family Cites Families (10)

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DE3728576A1 (en) * 1987-08-27 1989-03-09 Opel Adam Ag FUEL INJECTION SYSTEM
DE4318434A1 (en) * 1993-06-03 1994-12-08 Opel Adam Ag Holding device for a fuel injection valve of a diesel engine
JP3298262B2 (en) * 1993-10-13 2002-07-02 株式会社デンソー Accumulation type fuel injection device
DE4340311C1 (en) * 1993-11-26 1994-12-15 Daimler Benz Ag Method for fuel injection for an internal combustion engine with high-pressure injection
DE9410232U1 (en) * 1994-06-27 1995-11-02 Robert Bosch Gmbh, 70469 Stuttgart Fuel injection device for internal combustion engines
DE29502829U1 (en) * 1995-02-21 1996-06-20 Robert Bosch Gmbh, 70469 Stuttgart Fuel injection device for internal combustion engines
JPH08261105A (en) * 1995-03-22 1996-10-08 Mitsubishi Motors Corp Fuel injection device for internal combustion engine
JP3371620B2 (en) * 1995-05-29 2003-01-27 いすゞ自動車株式会社 Common rail fuel injector
DE19548610A1 (en) * 1995-12-23 1997-06-26 Bosch Gmbh Robert Flow limiting valve for fuel injection system
DE19601496C2 (en) * 1996-01-17 1998-07-30 Man Nutzfahrzeuge Ag Connection of an injection line to a pressure pipe of an injection valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543506A1 (en) 1995-11-22 1997-05-28 Man Nutzfahrzeuge Ag Injection line connection to compression tube of injection valve

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1108886A3 (en) * 1999-12-15 2003-11-26 Man Nutzfahrzeuge Ag Common rail fuel injection system
EP1793121A1 (en) * 2002-07-01 2007-06-06 Mitsubishi Heavy Industries, Ltd. Fuel injector and diesel engine comprising the same
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
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
DE102009020867A1 (en) * 2009-05-12 2010-11-18 Bayerische Motoren Werke Aktiengesellschaft Internal-combustion engine e.g. diesel engine, has circularly closed line pressing part formed by contact areas after mounting of fuel injector at fuel rail, where filling end and rail are formed concave and/or convex to each other at areas
DE102009020867B4 (en) 2009-05-12 2022-01-27 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with a fuel injector
AT527267A1 (en) * 2023-10-09 2024-11-15 Avl List Gmbh INTERNAL COMBUSTION ENGINE

Also Published As

Publication number Publication date
DE19754132A1 (en) 1999-06-10
DE19754132B4 (en) 2005-06-23
EP0921303A3 (en) 2003-01-02
EP0921303B1 (en) 2005-12-28
DE59813313D1 (en) 2006-02-02

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