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
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
  • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
  • F02M59/102—Mechanical drive, e.g. tappets or cams
• • 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
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
  • F02M59/445—Selection of particular materials

Definitions

• the invention relates to a component of a fuel injection device for an internal combustion engine having the features of the preamble of claim 1.
• PRIOR ART DE 103 55 027 A1 discloses a component of a fuel injection device for an internal combustion engine, wherein the component is designed as a high-pressure fuel pump.
• the high-pressure fuel pump has at least one pump element with a pump piston.
• the pump piston is acted upon by a spring element to a drive shaft out, wherein the spring element is supported via a support member on the pump piston.
• the support member is formed as a spring plate on which abuts the spring element designed as a helical compression spring.
• the spring plate is subject to high stress.
• the spring plate has resilient properties to allow an elastic deformation and uniform contact of the spring element. Furthermore, the spring plate due to high speeds and high delivery pressures of
• High-pressure fuel pump have a high vibration resistance. Since the spring plate is arranged in a fuel-filled interior of the high-pressure fuel pump this must be made of a corrosion-resistant material, in particular a steel material. However, corrosion resistant steel materials may be difficult to process and cause high wear on the manufacturing tools used. Moreover, when processing high-strength steel materials manufacturing errors can be generated, which greatly reduce the component strength. Disclosure of the invention
• the component according to the invention of a fuel injection device for an internal combustion engine with the features of claim 1 has the advantage that the component with resilient properties can be easily manufactured, the manufacturing tools have low wear and thus a long service life.
• FIGURE shows a detail of a pump of a fuel injection device for an internal combustion engine.
• a high-pressure fuel pump is shown in fragmentary form.
• the high-pressure fuel pump has at least one pump element 10 with a pump piston 12 which is driven indirectly by a drive shaft 14 in a stroke movement.
• the pump piston 12 is guided in a cylinder bore 16 of a housing part 18 of the high-pressure fuel pump and limited in the cylinder bore 16 a pump working space 20.
• the pump working chamber 20 is filled when directed to the drive shaft 14 suction stroke of the pump piston 12 with fuel via an inlet valve and directed away from the drive shaft 12 Delivery stroke of the pump piston 12 is displaced from the pump working chamber 20 fuel via an exhaust valve in a high pressure region.
• the pump piston 12 is supported on the drive shaft 14 via a support element 22 in the form of a roller tappet.
• a roller 24 is rotatably mounted, which rolls on a cam 26 of the drive shaft 14.
• the pump piston 12 and the roller tappet 22 are connected via a biased spring element in
• a spring plate 30 is connected, on which the spring 28 is supported, wherein the pump piston 12 is supported on Rollenstö- ßel 22 and thus the pump piston 12 and via this also the roller tappet 22 to the drive shaft 14 is acted upon.
• the spring plate 30 is disc-shaped and has a central opening 32 through which the pump piston 12 passes.
• the spring plate 30 may be formed or stepped substantially flat, wherein a central portion of the spring plate 30 which is fixed to the pump piston 12, with respect to a peripheral annular region against which the coil spring 28 is disposed offset in the direction of the longitudinal axis 13 of the pump piston 12 ,
• the spring plate 30 may be connected to the pump piston 12, for example by a press connection or a locking ring.
• the spring plate 30 must have resilient properties, so be elastically deformable in order to compensate for manufacturing and assembly tolerances and to allow a correct support of the spring 28.
• the interior of the high-pressure fuel pump, in which the spring plate 30 is located, filled with fuel the fuel may have corrosive properties under certain circumstances.
• the spring plate 30 is subject to high rotational speeds of the drive shaft 14 and high delivery pressures of the pump piston 12 high mechanical loads. According to the invention it is provided that the spring plate 30 from a
• the martensitic steel material contains in mass proportions a carbon content between 0.1% and 0.7% and a chromium content between 12% and 18%.
• the martensitic steel material contains in mass proportions a carbon content of between 0.4% and 0.5% and a chromium content of between 12.5% and 14.5%.
• Such a martensitic steel material is under the material no. 1.4034 or the DIN designation X46Crl3 known.
• Other suitable martensitic steel materials are known, for example, under the material no. 1.4024, 1.4021, 1.4028, 1.4031, 1.4037, 1.4419, 1.4116 or 1.4122.
• the spring plate 30 is preferably made by punching from a sheet material with the required wall thickness. Punching errors such as cracks or burrs can be avoided in the soft state by using the martensitic steel material and the punching tools used are subject to only a small amount of wear. After punching, the spring plate 30 is subjected to a heat treatment in order to achieve sufficient component strength and high wear resistance.
• the component 30 with resilient properties may be arranged in the form of a spring plate in another component of a fuel injection device, for example in an injector for injecting fuel into the combustion chamber of a cylinder of an internal combustion engine.
• the component 30 with resilient properties can also have any other configuration than the spring plate described above.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46510531

Family Applications (1)

Country Status (2)

Citations (3)

• 2012
  • 2012-05-03 DE DE201220004455 patent/DE202012004455U1/de not_active Expired - Lifetime
• 2013
  • 2013-04-15 WO PCT/EP2013/057805 patent/WO2013164183A1/fr not_active Ceased

Patent Citations (3)

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