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Piston fuel pump for an internal combustion engine

A piston type and fuel pump technology, which is applied to fuel injection pumps, parts of pumping devices for elastic fluids, fuel injection devices, etc., can solve problems such as cylinder honing, reduce oil leakage, improve fatigue strength, Reduces the effect of axial tilt

Active Publication Date: 2015-08-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the cylinders in the pump housing have to be honed with great effort

Method used

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  • Piston fuel pump for an internal combustion engine
  • Piston fuel pump for an internal combustion engine
  • Piston fuel pump for an internal combustion engine

Examples

Experimental program
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Effect test

Embodiment Construction

[0032] The fuel system of an internal combustion engine is figure 1 in total bears the reference number 10 . The fuel system comprises a fuel container 12 from which an electric pre-feed pump 14 delivers fuel into a low-pressure line 16 . The low-pressure line leads to a high-pressure pump in the form of a piston fuel pump 18 . A high-pressure line 20 leads from the high-pressure pump to a fuel rail 22 . Adjoining the fuel rail are a plurality of injectors 24 which inject fuel directly into the combustion chambers (not shown) which are each associated with the injectors.

[0033]The piston fuel pump 18 includes a pump housing 26 , shown only partially, in which a pump piston 28 is guided or mounted so that it can move. The pump piston can be set in a reciprocating motion by a drive 29 (roller tappet, cam drive) identified only by its reference number, which is indicated by the double arrow 30 marked on the side. The spring retainer 31 is pressed against the pump piston 28 ...

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Abstract

A piston fuel pump (18) for an internal combustion engine has a pump cylinder (40) and a pump piston (28) received in the pump cylinder (40) so as to be movable. The invention proposes that the pump piston is guided in a radial direction by means of at least a first and at least a second guide section (51, 72), and that the first and the second guide sections are spaced apart from one another in an axial direction, the first guide section being arranged in a pump cylinder of the piston fuel pump and the second guide section being arranged radially outwards in the region of the end section (52) facing the drive (29). The invention further proposes that the piston fuel pump (18) has, at the first guide section (51), a bearing and sealing arrangement (46) for the pump piston (28), which comprises a guide region (48) for the radial guidance of the pump piston (28) in the pump cylinder (40) and a sealing region (50) having a sealing lip.

Description

technical field [0001] The invention relates to a piston fuel pump according to the preamble of claim 1 . Background technique [0002] Fuel systems for internal combustion engines are known on the market, in which fuel is delivered from a fuel tank at high pressure into a fuel rail by means of a mechanically driven piston fuel pump. For this purpose, a movably mounted pump piston is provided in the piston fuel pump, which compresses the fuel in the delivery chamber of the piston fuel pump. The pump piston slides in the piston bush with a tight fit and is guided with a small sealing gap. In order to be supported and sealed by the gap seal, the piston bush must have a certain length and possibly absorb high transverse forces. Therefore, piston liners are usually manufactured from steel. Furthermore, due to the high tolerance requirements, so-called "piston pairs" are used, ie, specific pistons are assigned to the individual pump housings. Furthermore, the cylinders in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/44F02M59/02
CPCF02M59/442F02M59/02F04B53/143F16J15/56F04B15/02F04B53/14F02M59/025
Inventor S·施特里茨尔T·塞巴斯蒂安H·雅恩A·劳布P·罗佩茨
Owner ROBERT BOSCH GMBH
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