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plunger assembly

一种柱塞、组件的技术，应用在柱塞组件领域，能够解决升高压力操作、泄漏增加、柱塞和缸孔空隙增加等问题

Active Publication Date: 2020-08-04
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased clearance between plunger and cylinder bore while operating at elevated pressure resulting in increased leakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Embodiments of the invention are described below with respect to the orientation of the drawings. Terms such as up, down, above, below, top, and bottom are not intended to be limiting.

[0036] refer to Figure 3 to Figure 5 , the pump head 102 according to the present invention comprises a pump body or pump housing 104, an inlet valve arrangement 170 (in image 3 shown in ) and outlet valve assembly 180 (in image 3 shown in ). The pump housing 104 is provided with a cylinder bore 108 extending along the longitudinal axis A. As shown in FIG.

[0037] The plunger assembly 106 is located in the cylinder bore 108 . Chamber or ring domain 142 (in image 3 ) is disposed within the cylinder bore 108 above the first upper end 160 of the plunger 106 .

[0038] The plunger assembly 106 is reciprocally movable along the longitudinal axis A within the cylinder bore 108 by a force transmitted from a cam arrangement (not shown) to the second lower end 162 of the plunger assem...

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PUM

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Abstract

A plunger assembly (106) for a high pressure fuel pump head (102), wherein an axially inner bore (116) is provided in a first plunger section (110) and a The gap (140) between (110) and the second plunger section (120) is exposed to the pumped fuel pressure and wherein the pressure gradient is along the outer wall of the first section (110) and the cylinder bore (108) and the pressure within the borehole and void causes the deformation of the first section (110) to increase and thereby reduce the first section (110) and the cylinder bore as it moves towards the second section (120). The space between (108), thereby providing a seal from one end (160) of the plunger to the opposite end (162).

Description

technical field [0001] The present invention relates to a fuel pump for an internal combustion engine and, in particular, to a plunger assembly for a pump head used in a high pressure fuel injection system, such as a diesel fuel injection system. Background technique [0002] Known fuel pumps for high pressure fuel injection systems such as common rail diesel applications include a pump head and a plunger that is reciprocatable within a cylinder bore thereby establishing a pressure differential. In order to ensure that the necessary pressure difference is achieved, a sealing length is provided which includes the minimum gap between the plunger and the cylinder bore. This seal length and the clearance between the plunger and cylinder bore are the two factors that define the volumetric efficiency (VE) of the pump. [0003] To ensure that the OEM can meet the CO 2 Efficiency targets, fuel injection systems operate at higher pressures. A known problem with pump heads operatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/02F02M59/44
CPCF02M59/02F02M59/442
Inventor K·莱特I·索恩斯威特
Owner DELPHI TECH IP LTD