EP1555426A1 - Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers - Google Patents

Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers Download PDF

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Publication number
EP1555426A1
EP1555426A1 EP04000737A EP04000737A EP1555426A1 EP 1555426 A1 EP1555426 A1 EP 1555426A1 EP 04000737 A EP04000737 A EP 04000737A EP 04000737 A EP04000737 A EP 04000737A EP 1555426 A1 EP1555426 A1 EP 1555426A1
Authority
EP
European Patent Office
Prior art keywords
fuel
rail
hollow body
section
internal combustion
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Withdrawn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
EP04000737A
Other languages
English (en)
French (fr)
Inventor
Marco Novi
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 AG, Siemens Corp filed Critical Siemens AG
Priority to EP04000737A priority Critical patent/EP1555426A1/de
Publication of EP1555426A1 publication Critical patent/EP1555426A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a fuel-rail and a method for manufacturing a fuel-rail, in particular a fuel-rail for an internal combustion engine.
  • a fuel accumulator In order to keep pressure fluctuations during the operation of the internal combustion engine at a very low level, internal combustion engines are supplied with a fuel accumulator, to which the injection valves are connected and which has a relatively large volume.
  • a fuel accumulator is often referred to as a common rail. It may also be called a fuel-rail.
  • Known fuel-rails comprise a hollow body, which in the case of gasoline internal combustion engines is often formed with a rectangular cross-section.
  • the hollow body has recesses, where connectors for the fuel injection valves are arranged. These connectors can best be tightly fitted into the recess, if the recess is formed in a planar surface.
  • the rectangular hollow bodies have such planar surfaces and are therefore well-suited for that purpose and often need no additional treatment for making the surface planar.
  • the connection of the hollow body to a supply that supplies the fuel from a fuel tank via a low and/or high pressure fuel pump, needs to be tight and needs to withstand the high pressures. This supply is often connected at one axial end of the hollow body. On the other end of the hollow body a fuel pressure sensor or a fuel-pressure regulator valve may need to be installed.
  • the object of the invention is to create a fuel-rail and a method for manufacturing a fuel-rail which is simple.
  • the invention is distinguished by a fuel-rail with a one piece formed hollow body, which has a rectangular cross-section and turns into a circular cross-section in the area of at least one axial end of the hollow body.
  • a fuel-rail has the advantage that it can withstand the high pressures because of its geometrical shape needed for high pressure internal combustion engines. It is further very easy to mount connectors for fuel injectors on the planar surfaces of the rectangular cross-section part of the hollow body.
  • the circular cross-section formed area is most suited for connecting further elements. Threads, which ensure a very tight connection of the further elements, can easily be drilled inside the areas of the circular cross-section of the hollow body.
  • the method for manufacturing the fuel-rail is distinguished by the step of forming a hollow body, which has a rectangular cross-section, in the area of at least one axial end of the hollow body into a circular cross-section. Rectangular hollow bodies are widely and cheaply available as half-finished goods, which together with the forming process enables to produce a high quality and at the same time a fairly cheap fuel-rail.
  • the forming is being achieved by a cold forming process, which has the advantage that the hardness of the material stays unchanged.
  • An internal combustion engine ( Figure 1) comprises an inlet manifold, an engine block, a cylinder head, an exhaust manifold and a fuel supply device 1.
  • the fuel supply device 1 comprises a fuel tank 3, which is connected via a first fuel duct with a low pressure fuel pump 5.
  • the output of the low pressure fuel pump 5 is connected to an input to a high pressure fuel pump 7.
  • Connected to the output of the low pressure fuel pump 5 is also a mechanical regulator 9, which is connected on its output side via a further fuel duct with the fuel tank 3.
  • the mechanical regulator 9 is preferably a simple spring-loaded valve in the form of a check valve.
  • the spring constant of the check valve is preferably chosen in a way, that the connection between the low pressure fuel pump 5 and the high pressure fuel pump 7 a given low pressure of, for example, 3 to 6 Bars is not exceeded.
  • the high pressure fuel pump 7 delivers fuel via a supply 15 to a fuel-rail 17.
  • the high pressure fuel pump is in a preferred embodiment driven by a camshaft of the internal combustion engine.
  • a final control element 8 is assigned to the high pressure fuel pump 7, that controls the volume flow, which is delivered by the high pressure fuel pump 7.
  • Injection valves 19 are connected to the fuel-rail 17 and are preferably located in the cylinder head of the internal combustion engine.
  • the fuel-rail ( Figure 2) comprises a hollow body 25, which is generally rectangular-shaped in cross-section. At a first axial end 27 and/or a second axial end 29 the hollow body 25 has an area 31 and/or an area 33, which has a circular cross-section. In the inner or outer wall of the area 31 and/or respectively the area 33 a thread may be drilled, which serves to connect the supply 15 or a fuel pressure sensor 21 or a fuel pressure regulator, which may comprise an electromagnetic actuator.
  • the areas 31 and 33 are best suited for a drilling a thread because of their circular shape.
  • Connectors 35 for the fuel injection valves 19 are fitted into recesses of the hollow body 25 which are formed on one of its planar surfaces.
  • the planar surfaces are best suited for establishing a very tight fit of the connectors 35.
  • the fuel-rail is manufactured by preferably using a prefabricated metal hollow body of a suitable metal and a wall thickness in order to withstand the pressures, under which the fuel-rail is to be operated.
  • a prefabricated metal hollow body of a suitable metal and a wall thickness in order to withstand the pressures, under which the fuel-rail is to be operated.
  • Such rectangular hollow bodies are widely available as half-finished goods and may be cut into the right length.
  • the hollow body which at first has only a rectangular cross-section is formed in at least the area 31 or also the area 33 of at least one axial end into a circular cross-section. This is achieved by a suitable forming process.
  • a cold forming process is used.
  • Such a cold forming process has the advantage that the hardness of the material stays unchanged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP04000737A 2004-01-15 2004-01-15 Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers Withdrawn EP1555426A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04000737A EP1555426A1 (de) 2004-01-15 2004-01-15 Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04000737A EP1555426A1 (de) 2004-01-15 2004-01-15 Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers

Publications (1)

Publication Number Publication Date
EP1555426A1 true EP1555426A1 (de) 2005-07-20

Family

ID=34610177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04000737A Withdrawn EP1555426A1 (de) 2004-01-15 2004-01-15 Kraftstoffverteiler und Verfahren zur Herstellung eines Kraftstoffverteilers

Country Status (1)

Country Link
EP (1) EP1555426A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022372A (en) * 1988-03-15 1991-06-11 Usui Kokusai Sangyo Kaisha Ltd. Fuel delivery rail assembly
US5072710A (en) * 1989-05-06 1991-12-17 Usui Kokusai Sangyo Kaisha Ltd. Fuel delivery rail assembly
EP1318292A2 (de) * 2001-12-10 2003-06-11 Dana Corporation Verfahren zum Herstellen eines Kraftstoffverteilers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022372A (en) * 1988-03-15 1991-06-11 Usui Kokusai Sangyo Kaisha Ltd. Fuel delivery rail assembly
US5072710A (en) * 1989-05-06 1991-12-17 Usui Kokusai Sangyo Kaisha Ltd. Fuel delivery rail assembly
EP1318292A2 (de) * 2001-12-10 2003-06-11 Dana Corporation Verfahren zum Herstellen eines Kraftstoffverteilers

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