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High-pressure pump

A technology of high-pressure pumps and pump components, which is applied in the field of high-pressure pumps, radial or in-line piston pumps, and can solve problems such as high-pressure pump failure, hindering high-pressure pump operation, damage, etc., and achieve the effect of structural improvement

Inactive Publication Date: 2015-12-02
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high-pressure pump known from DE 10 2005 046 670 A1 has the disadvantage that, during operation, damage can occur in the region of the rollers by cracks in the vicinity of the surface, etc., which can hinder the operation of the high-pressure pump and lead to failure of the high-pressure pump

Method used

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Embodiment Construction

[0017] figure 1 A high-pressure pump 1 according to an exemplary embodiment of the invention is shown in a schematic axial section. In particular, the high-pressure pump 1 can be designed as a radial or in-line piston pump. In particular, the high-pressure pump 1 is suitably used as a fuel pump of a fuel injection device for an air-compressed, self-ignition internal combustion engine. A preferred application of the high-pressure pump 1 is a fuel injection plant with a common rail for storing high-pressure diesel fuel. However, the high-pressure pump 1 according to the invention is also suitable for other applications.

[0018] The high-pressure pump 1 has a multi-part pump housing 2 with a housing part 3 and a flange 4 . The pump housing 2 has a bore 5 . A pump assembly 6 is arranged in the region of the bore 5 . Furthermore, the high-pressure pump 1 has a drive shaft 7 , which is mounted in the pump housing 2 . Here, the drive shaft 7 is supported on one side at a beari...

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Abstract

A high-pressure pump (1) which serves, in particular, as a radial or in-line piston pump for fuel injection systems of air-compressing, auto-ignition internal combustion engines, comprises a pump assembly (6) and a drive shaft (7) which has at least one cam (10) which is assigned to the pump assembly (6). Here, the pump assembly (6) comprises a roller (31) which runs on a running surface (34) of the cam (10) and a roller shoe (30) which receives the roller (31). Here, at least one anti-corrosion layer is provided on the roller (31) and / or at least one anti-corrosion layer is provided on the roller shoe (30) and / or at least one anti-corrosion layer is provided on the cam (10). This can prevent oscillation crack corrosion occurring during operation, which corrosion can lead under loading to breakouts near the surface and, as a result, to failure of the high-pressure pump.

Description

technical field [0001] The invention relates to a high-pressure pump, especially a radial or in-line piston pump. In particular, the invention relates to the field of fuel pumps for fuel injection systems of air-compressed, self-igniting internal combustion engines. Background technique [0002] A high-pressure pump for a fuel injection system of an internal combustion engine is known from DE 10 2005 046 670 A1. The known high-pressure pump has a pump housing in which a pump element is arranged. The pump element includes a reciprocating pump piston driven by a drive shaft. The pump piston is guided displaceably in a cylinder bore of a part of the pump housing and delimits a pump working chamber in the cylinder bore. The pump piston is supported indirectly on the drive shaft via a hollow-cylindrical tappet. In this case, the tappet body is guided displaceably in a bore of a part of the pump housing in the longitudinal direction of the pump piston. In the tappet body, in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/10F02M59/44F04B1/04C23C30/00F04B9/04
CPCF02M59/102C23C30/00F02M59/445F04B1/0413F05C2253/12F02M2200/9038
Inventor G·迈尔G·雷鹏U·迈
Owner ROBERT BOSCH GMBH