Common-rail fuel injection system fuel supply pump

A technology of fuel injection system and fuel supply pump, which is applied in the direction of charging system, fuel injection pump, fuel injection device, etc., can solve the problems of affecting the sliding property of the plunger, large assembly stress, poor assembly process, etc., to improve performance and Reliability, improve work reliability, improve the effect of assembly and disassembly process

Active Publication Date: 2006-05-17
CHINA FIRST AUTOMOBILE
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  • Abstract
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  • Claims
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Problems solved by technology

During the assembly process, problems such as parts slipping and sealing ring deflection are prone to occur, resulting in oil leakage or rework
Therefore, the assembly process of the above structure is poor, and the sealing of the components is difficult to guarantee.
In addition, as de

Method used

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  • Common-rail fuel injection system fuel supply pump
  • Common-rail fuel injection system fuel supply pump
  • Common-rail fuel injection system fuel supply pump

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[0011] The structural features and assembly conditions of the fuel supply pump of the common rail fuel injection system designed according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0012] figure 1 Shown is a fuel supply pump for a common rail fuel injection system of a low-emission compression ignition engine (diesel engine) designed according to the present invention. The camshaft (2) installed in the pump body (1) among the figure is driven to rotate by the engine. Rotating camshaft drives oil pumping part (10) and oil delivery pump (not shown among the figure) work through tappet body part (3) and plunger spring (4). When the oil pumping part (10) works, it can provide high-pressure fuel oil with a pressure of 160MPa or higher to the common rail pipe.

[0013] figure 2 Shown is the structure of the oil pumping part (10) in this embodiment. Among them, the oil pumping part (10) consists of a plunger slee...

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Abstract

The present invention relates to a fuel-feeding pump of common rail injection system applicable to vehicle low-discharge compression ignition engine. It is mainly characterized by that external peripheral surface of valve seat in its fuel-pumping component has screw threads, the valve seat is fixed in the screw hole of plunger bushing and can be used for making orifice plate be lightly pressed on the sealed end face of plunger bushing. Besides, on the valve seat several circular holes for mounting and removal are set, and the sealing ring is mounted in the circular groove positioned in the middle of clamping nut.

Description

technical field [0001] The invention relates to a fuel supply pump for a common rail fuel injection system of an internal combustion engine, in particular to a fuel supply pump suitable for a common rail fuel injection system of a low-emission compression ignition engine (diesel engine) used in vehicles. Background technique [0002] In order to meet the increasingly stringent emission regulations, it is necessary to improve the control accuracy of fuel injection quantity and fuel injection timing, and to precisely control the fuel injection rate of each cylinder of the engine. Electronically controlled common rail fuel injection system is a new technology that can meet the above requirements. In the common rail fuel injection system, the high-pressure fuel supply pump driven by the engine provides high-pressure fuel to the common rail pipe, and the common rail pressure can reach 160MPa or higher. One or more oil pumping components are mounted on the oil supply pump. The s...

Claims

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Application Information

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IPC IPC(8): F02M59/46F02M63/02
Inventor 张礼林胡森峰庄福如杨凯
Owner CHINA FIRST AUTOMOBILE
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