EP3418550A1 - Rails de carburant filetés - Google Patents

Rails de carburant filetés Download PDF

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Publication number
EP3418550A1
EP3418550A1 EP17176934.2A EP17176934A EP3418550A1 EP 3418550 A1 EP3418550 A1 EP 3418550A1 EP 17176934 A EP17176934 A EP 17176934A EP 3418550 A1 EP3418550 A1 EP 3418550A1
Authority
EP
European Patent Office
Prior art keywords
tube
fuel
threads
injector
rail assembly
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
EP17176934.2A
Other languages
German (de)
English (en)
Other versions
EP3418550B1 (fr
Inventor
Paul G. Carey
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.)
Hi-Vol Products LLC
Original Assignee
Hi-Vol Products LLC
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 Hi-Vol Products LLC filed Critical Hi-Vol Products LLC
Priority to EP17176934.2A priority Critical patent/EP3418550B1/fr
Priority to PL17176934T priority patent/PL3418550T3/pl
Publication of EP3418550A1 publication Critical patent/EP3418550A1/fr
Application granted granted Critical
Publication of EP3418550B1 publication Critical patent/EP3418550B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the technical domain of the invention relates to threaded fuel rails.
  • One aspect of this disclosure incudes a fuel rail assembly for gasoline direct injection fuel delivery to an engine.
  • a fuel rail or tube is often provided. Frequently, the main fuel is gasoline.
  • Current high pressure fuel rail assemblies are made of a stainless steel tube and numerous stainless steel components such as injectors that are tack welded and thermally brazed together into a complete assembly.
  • Current rail operating pressures are around 20 MPa (2900 PSI) maximum.
  • Conventional designs have some difficulty in dealing with a higher maximum pressure of approximately 30 MPa (4400 PSI) and beyond. Such pressures raise concerns as to the integrity and reliability of the brazed joint connection.
  • brazed joint One of the concerns on any welded or brazed joint is the inability to easily verify the reliability of the connection.
  • a brazed joint can visually look satisfactory but be compromised due to variations in the braze process. At higher pressures this would raise concerns about rail safety and performance.
  • Japanese patent Laid-Open No. 2005-69023 discloses a tube or rail along which fuel travels under pressure. Through holes are defined in a wall section of the tube.
  • the fuel rail is formed of diverging branch pipes.
  • metal fittings are connected to the tube by a brazing step after the metal fittings are inserted into through holes provided in a peripheral wall section of the main rail.
  • Fuel rails made of aluminum for direct-injection internal combustion engines cannot be used where injection pressures may reach 150-250 MPa. This is because the strength of aluminum is low. Further, the fuel rail may have disadvantageous layout characteristics because the wall thickness of the rail must be sufficient to withstand high fuel pressures. Consequently, production costs rise because contact surfaces with fuel must be treated by expensive surface treatment protocols. This may be required if the aluminum fuel rail is sensitive to alcohol and corrosive fuel.
  • One aspect of this disclosure involves gasoline direct injection fuel delivery systems in which screw threads are provided on the components to be assembled. This allows for process control that will ensure a reliable connection that can withstand increased pressure and performance requirements.
  • one departure from conventional approaches and structures includes the method of attachment of injectors to the tube. A brazing step is no longer used. This attachment method and significantly increases allowable rail pressure and structural reliability while decreasing rail cost.
  • the present disclosure relates to a fuel rail (a delivery pipe) for supplying high pressure fuel from fuel booster pumps. Fuel is injected through a fuel injector (an injection nozzle) into an engine cylinder.
  • a fuel injector an injection nozzle
  • One embodiment of a fuel rail assembly for gasoline direct injection fuel delivery to an engine includes a common rail tube with internal and external walls, an upstream end and a downstream end.
  • the tube has one or more threaded orifices extending between the internal and external walls.
  • Injector sockets are threadingly engaged with the orifices.
  • Each of the injector sockets has a proximal nipple end region connected to the tube and a distal end region. Screw threads are disposed around the proximal nipple end region. At the tube and at the proximal end of the injector socket, the screw threads begin with a lead thread and thus form registered mechanical connections between the injector sockets and the tube that are adapted to withstand higher maximum pressures than those at which conventional fuel rail assemblies can operate safely.
  • An orientation notch is provided in the distal end region of at least some of the injector sockets.
  • the lead thread of an injector socket is defined so that it is aligned with an associated orientation notch, which has its own lead thread.
  • the associated orientation notch is situated in a home position after threading engagement of the proximal nipple end regions of the one or more injector sockets by the tube.
  • a pre-defined angular position of the injector sockets is created after torquing the injector sockets. In the predefined angular position, mechanical connections thereby formed seal the joints between the tube and the injector sockets.
  • the fuel rail assembly has end threads defined in the internal wall of the tube at its the upstream and downstream ends.
  • a fuel inlet with threads engages the upstream end thread at the upstream end of the tube.
  • An end cap sensor boss with threads engages the downstream end thread at the downstream end of the tube.
  • the disclosed structure is expected to be used at higher maximum pressures equal to or in excess of approximately 35 MPa (5000 PSI) and will address concerns as to the integrity and reliability of conventional brazed joint connection.
  • One aspect of this disclosure involves gasoline direct injection fuel delivery systems that operate under pressures that may be as high as 35 MPa (5000 PSI).
  • pressures that may be as high as 35 MPa (5000 PSI).
  • precisely oriented screw threads are provided on the components to be assembled. This allows for process control that will ensure a reliable connection between a tube 10 and an injector socket 12 that can withstand the increased pressure and performance requirements ( FIGS. 1-5 ).
  • one departure from conventional approaches and structures includes the method of attachment of the injectors 12 to the tube 10. A brazing step is no longer used.
  • the disclosed attachment method allows safe and reliable operation under high rail pressures and provides structural reliability while decreasing rail cost.
  • the present disclosure relates to a fuel rail (a delivery pipe, 10) for supplying high-pressure fuel from fuel booster pumps through an inlet 11. Fuel is injected through a fuel injector (an injection nozzle, 12) directly into an engine cylinder 13.
  • a fuel injector an injection nozzle, 12
  • a fuel rail assembly for gasoline direct injection fuel delivery to an engine includes a common rail tube 10 with internal 14 and external 16 walls, an upstream end 18 and a downstream end 20.
  • the tube 10 has one or more threaded orifices 21 extending between the internal and external walls 14, 16.
  • Injector sockets 12 are threadingly engaged with the orifices 32.
  • Each of the injector sockets 12 has a proximal nipple end region 22 to be connected to the tube 10 and a distal end region 24.
  • Screw threads 26 are disposed around the proximal nipple end region 22.
  • the screw threads 26 begin with a lead thread which mates with a lead thread 30 in an aperture 32 that extends through the tube wall, thereby forming mechanical connections between the injector sockets 12 and the tube 10 that are adapted to withstand higher maximum pressures than those at which conventional fuel rail assemblies can operate safely.
  • An orientation notch 34 is provided in the distal end region 24 of at least some of the injector sockets 12.
  • the lead thread 28 is formed so that it is aligned with an associated orientation notch 34.
  • the orientation notch 34 is oriented before engagement with the tube 10 in relation with a longitudinal axis A - A of the tube 10.
  • the fuel rail assembly has end threads defined in the internal wall at the upstream 18 and downstream ends 20 of the tube 10.
  • a fuel inlet 38 ( FIG. 3 ) with threads engages the upstream end thread at the upstream end 18 of the tube 10.
  • An end cap sensor boss 44 with threads engages the downstream end thread at the downstream end 20 of the tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP17176934.2A 2017-06-20 2017-06-20 Rails de carburant filetés Active EP3418550B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17176934.2A EP3418550B1 (fr) 2017-06-20 2017-06-20 Rails de carburant filetés
PL17176934T PL3418550T3 (pl) 2017-06-20 2017-06-20 Gwintowane listwy paliwowe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17176934.2A EP3418550B1 (fr) 2017-06-20 2017-06-20 Rails de carburant filetés

Publications (2)

Publication Number Publication Date
EP3418550A1 true EP3418550A1 (fr) 2018-12-26
EP3418550B1 EP3418550B1 (fr) 2019-11-20

Family

ID=59093457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17176934.2A Active EP3418550B1 (fr) 2017-06-20 2017-06-20 Rails de carburant filetés

Country Status (2)

Country Link
EP (1) EP3418550B1 (fr)
PL (1) PL3418550T3 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129920A (ja) 2001-10-22 2003-05-08 Usui Internatl Ind Co Ltd フユーエルデリバリパイプ
EP1378658A1 (fr) * 2002-07-04 2004-01-07 Denso Corporation Système d'injection de combustible à accumulateur pour moteurs à combustion interne
JP2005069023A (ja) 2003-08-26 2005-03-17 Usui Kokusai Sangyo Kaisha Ltd ディーゼル内燃機関用燃料蓄圧容器
EP2284385A1 (fr) 2009-07-07 2011-02-16 Continental Automotive GmbH Dispositif de rampe de carburant et ensemble de couplage
EP2333302A1 (fr) 2008-06-30 2011-06-15 Usui Kokusai Sangyo Kaisha Limited Rampe à carburant pour moteur à combustion interne à injection directe haute pression et son procédé de fabrication
US8074624B2 (en) 2009-05-04 2011-12-13 Hitachi Automotive Systems, Ltd. Fuel system component for a direct injection internal combustion engine
US8844502B2 (en) 2012-07-24 2014-09-30 Ford Global Technologies, Llc Fuel rail mount
US8844500B2 (en) 2011-01-22 2014-09-30 Cummins Intellectual Property, Inc. Enclosure for high pressure fuel rail
DE102013220788B3 (de) * 2013-10-15 2014-11-13 Continental Automotive Gmbh Anordnung für ein Kraftstoffeinspritzsystem

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129920A (ja) 2001-10-22 2003-05-08 Usui Internatl Ind Co Ltd フユーエルデリバリパイプ
EP1378658A1 (fr) * 2002-07-04 2004-01-07 Denso Corporation Système d'injection de combustible à accumulateur pour moteurs à combustion interne
JP2005069023A (ja) 2003-08-26 2005-03-17 Usui Kokusai Sangyo Kaisha Ltd ディーゼル内燃機関用燃料蓄圧容器
EP2333302A1 (fr) 2008-06-30 2011-06-15 Usui Kokusai Sangyo Kaisha Limited Rampe à carburant pour moteur à combustion interne à injection directe haute pression et son procédé de fabrication
US8596246B2 (en) 2008-06-30 2013-12-03 Usui Kokusai Sangyo Kaisha Limited Fuel rail for high-pressure direct-injection internal combustion engines and method for manufacturing thereof
US8074624B2 (en) 2009-05-04 2011-12-13 Hitachi Automotive Systems, Ltd. Fuel system component for a direct injection internal combustion engine
EP2284385A1 (fr) 2009-07-07 2011-02-16 Continental Automotive GmbH Dispositif de rampe de carburant et ensemble de couplage
US8844500B2 (en) 2011-01-22 2014-09-30 Cummins Intellectual Property, Inc. Enclosure for high pressure fuel rail
US8844502B2 (en) 2012-07-24 2014-09-30 Ford Global Technologies, Llc Fuel rail mount
DE102013220788B3 (de) * 2013-10-15 2014-11-13 Continental Automotive Gmbh Anordnung für ein Kraftstoffeinspritzsystem

Also Published As

Publication number Publication date
EP3418550B1 (fr) 2019-11-20
PL3418550T3 (pl) 2020-06-29

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