EP1445474A1 - Injecteur de carburant, common rail et système d'injection de carburant - Google Patents

Injecteur de carburant, common rail et système d'injection de carburant Download PDF

Info

Publication number
EP1445474A1
EP1445474A1 EP03001800A EP03001800A EP1445474A1 EP 1445474 A1 EP1445474 A1 EP 1445474A1 EP 03001800 A EP03001800 A EP 03001800A EP 03001800 A EP03001800 A EP 03001800A EP 1445474 A1 EP1445474 A1 EP 1445474A1
Authority
EP
European Patent Office
Prior art keywords
fuel
rail
tube
injector
fuel injector
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Withdrawn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
EP03001800A
Other languages
German (de)
English (en)
Inventor
Roberto Ricci
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.)
Continental Automotive Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to EP03001800A priority Critical patent/EP1445474A1/fr
Publication of EP1445474A1 publication Critical patent/EP1445474A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F02M55/02—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
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down

Definitions

  • the invention relates to a fuel injector with a fuel tube, whereby the end of the fuel tube can be used for connecting the fuel injector to a fuel rail. Furthermore, the invention relates to a fuel rail that is used for supplying a fuel injector with fuel.
  • the fuel rail comprises a fuel tube that can be used for connecting the fuel rail with the fuel injector.
  • the invention relates to a fuel injection system with a fuel rail that is connected to the fuel injector via a fuel tube.
  • Fuel injection systems with a fuel rail and a fuel injector are used for example for direct injection that provides fuel with a high pressure in a fuel rail.
  • the fuel rail supplies the fuel to the fuel injector. If the fuel is under high pressure then the fuel rail has to be connected to the fuel injector by a tube.
  • the tube has the function to deliver the pressurized fuel to the injector and to maintain the pressure of the fuel. Therefore it is not possible to use elastic fuel lines as these are known to be used in injection systems that use fuel with low or no pressure.
  • a fuel rail supplies some fuel injectors with fuel and the position of the fuel injectors is determined by the position of the fuel rail, because the connection between the fuel rail and the fuel injectors is rigid. Each fuel injector however must fit in a corresponding fuel injector opening of a cylinder head. Misalignment and production tolerances result in fitting problems.
  • DE 19 748 593 A1 provides the use of fuel injectors that are connected to a fuel rail that is divided into two parts. The two parts are connected by a flexible part. Each fuel injector is pressed into an injector opening of the cylinder head by a spring element, whereby tips of the injectors are arranged within a longitudinal cylindrical bore.
  • the longitudinal axis of a bore is in alignment with the direction of a fuel injector. Because of the cylindrical shape of the bore the longitudinal position of the fuel injector does not have to fit precisely. Deviations in the longitudinal positions of the fuel injectors are compensated by the flexible tube of the fuel rail.
  • WO 2001/71179 A2 describes a fuel injector assembly for mounting a fuel injector to a fuel rail and permitting alignment of the fuel injector.
  • the assembly includes a cup having an upper portion and a lower portion, the upper portion being connected to a fuel rail and the lower portion including an interior, an exterior and a lower surface.
  • the fuel injector comprises an inlet, an outlet and a fuel passage way extending from the inlet to the outlet, the inlet being positioned within the interior of the cup.
  • a collar can be positioned in proximity to the lower surface of the cup, the collar cincturing the inlet of the fuel injector.
  • a fastener is secured to the exterior of the cup in such a way that the ring establishes an interference fit between the collar and the inlet of the fuel injector.
  • the inlet extends to a given distance in the cup, allowing different positions of the fuel injector in a given longitudinal axis, whereby the fuel injector is tightly connected with the fuel rail. Depending on the distance between the cylinder head and the fuel rail, the inlet of the fuel injector is more or less inserted into the cup.
  • the object of the invention is achieved by the fuel injector according to claim 1, by the fuel rail according to claim 3 and by the fuel injection system according to claim 6.
  • the proposed fuel injector has the advantage that different distances between a cylinder head and the fuel rail can be compensated by the fuel injector or the fuel rail. That advantage is achieved by a flexible fuel tube that is part of the fuel injector or part of the fuel rail.
  • the flexible fuel tube can be elongated, compressed or bended if necessary. The flexible tube however does not change its diameter, so that the pressure of the fuel does not decrease.
  • a preferred embodiment of the flexible fuel tube is a metallic expansion bellow.
  • the metallic expansion bellow has the advantage that high pressure of the fuel can reliably be maintained and the metallic expansion bellow is a well-known tool that is cheaply produced.
  • the inventive fuel injector or the inventive fuel rail has the advantage that the fuel rail could be fixed to the cylinder head in a predetermined position. The fixing of the fuel rail to the cylinder head shows the advantage that the fixing is easy and cheap.
  • Fig. 1 is a schematic view of a fuel injection system.
  • Fig. 2 is a detailed view of a first embodiment of the invention.
  • Fig. 3 is a detailed view of a second embodiment of the invention.
  • Fig. 4 is a view of a third embodiment of the invention.
  • Fig. 1 shows a fuel injection system that can be used for injecting petrol or gasoline.
  • the fuel injection system comprises a fuel rail 22 that is connected with a pressure pump 11.
  • the pressure pump is hydraulically connected with a fuel tank 12.
  • the pressure pump 11 sucks fuel from the fuel tank 10 and pumps the fuel to the fuel rail 22.
  • the pressure in the fuel rail 22 may be up to 150 bar for petrol and up to 1800 bar for gasoline.
  • the fuel rail is hydraulically connected with fuel injectors 1.
  • the fuel injectors 1 are fixed in injector openings 16 of a cylinder head 6 of a motor block 20.
  • the motor block 20 comprises combustion chambers 13 that are provided with fuel by the fuel injectors 1.
  • the fuel injectors 1 and the pressure pump 11 are electrically connected with a controlling unit 14.
  • the controlling unit 14 controls the pressure and the volume of fuel that is pumped by the pressure pump 11.
  • the controlling unit 14 also controls the injection of the fuel injectors 1.
  • the fuel injectors 1 inject fuel in the combustion chambers 13 at predetermined points of time.
  • the fuel rail 22 is fixed to the motor block 20. Therefore the position of the fuel rail is determined depending to the position of the injector openings 16 of the cylinder head 6, into which the fuel injectors 1 are inserted.
  • Fig. 2 shows a part of the motor block 20, a part of the fuel rail 22 and the fuel injector 1.
  • the fuel rail 22 is fixed to the motor block 20 by means of a screw 24.
  • the fuel injector 1 comprises an injector tip 15 that injects fuel into the combustion chamber 13.
  • the injector tip 15 is inserted in the injection hole 16 that is arranged in the cylinder head 6.
  • the injection opening 16 is connected to the combustion chamber 13.
  • the injector tip 15 comprises a sealing ring 17 that seals the combustion chamber 13.
  • the fuel injector 1 comprises an inlet tube 2 that is connected to a rail connecting tube 21 of the fuel rail 22.
  • the rail connecting tube 21 is produced in one piece with the fuel rail and is not flexible.
  • a thread is provided to which a nut 5 is screwed providing a hydraulic connection between a tube end 3 of a flexible tube 4 and the rail connecting tube 21.
  • the tube end 3 is pressed against a sealing face of the rail connecting tube 21 with a sealing face, providing a tight connection between the fuel injector 1 and the fuel rail 22.
  • the flexible tube 4 is for example produced as a metallic expansion bellow.
  • the metallic expansion bellow is flexible within a predetermined range.
  • the expansion bellow can be extended or bended but its diameter does not change. If the bellow is mounted between the fuel rail and a fuel injector, that are fixed to the motor block, then the length of the metallic bellow is steady and the volume of the bellow does not change with the change of pressure in the fuel. Therefore the pressure of the fuel that is delivered from the fuel rail 22 to the fuel injector 1 does not decrease passing the bellow.
  • each injection opening 16 may have a different distance to the fuel injector and the injection openings 16 may not always be in line with the assigned rail connecting tubes 21. Deviations of an optimum position of the injection openings 16 are compensated by the flexible fuel tube 4 that allow different positions of the fuel injectors referred to the fuel rail 22.
  • Fig. 3 shows another embodiment of the invention with a flexible fuel tube 4 that is directly connected to the rail connecting tube 21.
  • the flexible fuel tube 4 is i.e. welded to the rail connecting tube 21.
  • the flexible tube 4 is connected to an inlet tube 2 of the fuel injector 1 by means of a nut 5.
  • the fuel rail 22 is hydraulically connected with the fuel injector 1 via a tight connection. Also in this embodiment, deviations of an optimum position of the injection openings 16 at a distance to the fuel rail 22 and/or in lateral position to the assigned rail connecting tubes 21 can be compensated by the flexible tube 4.
  • Fig. 4 shows a third embodiment of the invention that is basically constructed as the embodiment of Fig. 3, but comprises a spring element 10 that is arranged between the fuel rail 22 and the inlet tube 2 of the fuel injector 1.
  • the spring element 10 surrounds the flexible tube 4 and presses the fuel injector 1 with its inlet tube 2 in the direction of the injection opening 16.
  • This embodiment has the advantage that deviations of the optimum position of the injection opening can be compensated by the flexible tube 4 and the fuel injector 1 is additionally pressed against the cylinder head 6 providing a sealing of the injection opening 16.
  • the flexible tube 4 is arranged within the axis of the spring element 10. This embodiment shows the advantage that the fuel injector 1 is safeguarded against the pressure in the combustion chamber 13 by the spring element. Furthermore the flexible tube 4 is protected against the pressure that is guided from the combustion chamber 13 by the fuel injector 1 to the flexible tube 4 by the spring element 10.
  • the flexible tube 4 has the advantage that it can be bended or elongated but does not change its diameter. This means that the flexible tube could be used for compensating different distances between the fuel rail and the cylinder head 6 or misalignments between the axis of the rail line 21 and the axis of the injection opening 16. In the mounted position the flexible tube 4 does not change its size, which means that the pressure of the fuel rail cannot change the volume of the flexible tube 4 so that the pressure does not decrease using the flexible tube 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP03001800A 2003-01-28 2003-01-28 Injecteur de carburant, common rail et système d'injection de carburant Withdrawn EP1445474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03001800A EP1445474A1 (fr) 2003-01-28 2003-01-28 Injecteur de carburant, common rail et système d'injection de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03001800A EP1445474A1 (fr) 2003-01-28 2003-01-28 Injecteur de carburant, common rail et système d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1445474A1 true EP1445474A1 (fr) 2004-08-11

Family

ID=32605254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03001800A Withdrawn EP1445474A1 (fr) 2003-01-28 2003-01-28 Injecteur de carburant, common rail et système d'injection de carburant

Country Status (1)

Country Link
EP (1) EP1445474A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780403A2 (fr) 2005-10-25 2007-05-02 Robert Bosch Gmbh Soupape d'injection de combustible
EP2006530A1 (fr) * 2007-06-21 2008-12-24 Benteler Automobiltechnik GmbH Rampe commune
CN103140665A (zh) * 2010-06-30 2013-06-05 奥比托澳大利亚有限公司 燃料喷射组件
EP2813699A1 (fr) * 2013-06-14 2014-12-17 FPT Motorenforschung AG Agencement de tuyauterie de carburant type rampe commune dans des systèmes d'alimentation en carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295452A (en) * 1978-07-01 1981-10-20 Robert Bosch Gmbh Fuel injection system
US6148797A (en) * 1997-12-17 2000-11-21 Robert Bosch Gmbh Mounting device for mounting fuel injection valves
WO2001071179A2 (fr) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Ensemble injecteur de carburant utilise pour installer un injecteur de carburant sur une rampe de carburant et pour assurer l'alignement de l'injecteur de carburant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295452A (en) * 1978-07-01 1981-10-20 Robert Bosch Gmbh Fuel injection system
US6148797A (en) * 1997-12-17 2000-11-21 Robert Bosch Gmbh Mounting device for mounting fuel injection valves
WO2001071179A2 (fr) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Ensemble injecteur de carburant utilise pour installer un injecteur de carburant sur une rampe de carburant et pour assurer l'alignement de l'injecteur de carburant

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780403A2 (fr) 2005-10-25 2007-05-02 Robert Bosch Gmbh Soupape d'injection de combustible
EP1780403A3 (fr) * 2005-10-25 2007-11-21 Robert Bosch Gmbh Soupape d'injection de combustible
EP2006530A1 (fr) * 2007-06-21 2008-12-24 Benteler Automobiltechnik GmbH Rampe commune
CN103140665A (zh) * 2010-06-30 2013-06-05 奥比托澳大利亚有限公司 燃料喷射组件
CN103140665B (zh) * 2010-06-30 2016-03-02 奥比托澳大利亚有限公司 燃料喷射组件
EP2813699A1 (fr) * 2013-06-14 2014-12-17 FPT Motorenforschung AG Agencement de tuyauterie de carburant type rampe commune dans des systèmes d'alimentation en carburant
WO2014198818A1 (fr) * 2013-06-14 2014-12-18 Fpt Motorenforschung Ag Système de tuyauterie de carburant dans des systèmes d'alimentation en carburant du type à rampe commune
JP2016520764A (ja) * 2013-06-14 2016-07-14 エフピーティー モーターエンフォーシュング エージー 共通レール型燃料供給システムの燃料配管構成
US10260468B2 (en) 2013-06-14 2019-04-16 Fpt Motorenforschung Ag Fuel piping arrangement in common rail type fuel supply systems

Similar Documents

Publication Publication Date Title
US7874282B2 (en) Coupling device and fuel supply arrangement
EP2093413B1 (fr) Dispositif de couplage
EP2098720B1 (fr) Système d'alimentation en carburant
US20100258085A1 (en) Coupling device
US6899069B2 (en) Valve for controlling liquids
US8875682B2 (en) Coupling device and fuel injection arrangement
US8245697B2 (en) Coupling device
US8171917B2 (en) Coupling device
US6644279B1 (en) High pressure reservoir for fuel
US9803605B2 (en) Fluid injection assembly
EP1445474A1 (fr) Injecteur de carburant, common rail et système d'injection de carburant
KR101760656B1 (ko) 커플링 장치
KR20120084813A (ko) 커먼-레일 분사 시스템용 압력 파이프 피팅
JP2010031774A (ja) 燃料供給装置
WO2008057030A1 (fr) Dispositif pour raccorder une conduite à haute pression à un réservoir accumulateur
US20050166898A1 (en) Fuel injection system and cylinder head with a central fuel reservoir
EP1224393B1 (fr) Systeme de distribution de fluide moteur pour injecteur de carburant
EP2090772B1 (fr) Ensemble de couplage
US6565013B1 (en) Common rail injector
US20030084880A1 (en) Pressure-resistant common rail
US6793252B1 (en) Method for machining a common rail, common rail, and connection stub for application of the method
KR20080042670A (ko) 대형 디젤 내연기관의 연료 공급 장치 및 연료 공급 장치의고압 연료 라인
CN109477448B (zh) 燃料喷射设备和用于燃料喷射设备的组件
EP0922852A2 (fr) Système de carburant
KR100460855B1 (ko) 엘피지 차량의 액상 연료 이송장치

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20050212