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Control valve assembly

一种控制阀、组件的技术，应用在发动机元件、机器/发动机、装料系统等方向，能够解决泄漏路径增大、增大燃料泄漏量与燃料喷射量、泄漏等问题

Active Publication Date: 2017-08-01
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular; leakage may occur between the control valve member 4 and the guide of the bore 8 of the control valve body 6
[0005] Increased fuel pressure in the bore 8 causes the pilot portion of the bore 8 to expand, thereby increasing the gap between the control valve member 4 and the control valve body 6, resulting in an increased leakage path
Increased leakage has a negative effect on the efficiency of the injector 1, for example increasing the ratio of the fuel leakage quantity to the fuel injection quantity

Method used

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Examples

Experimental program
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Embodiment Construction

[0022] The invention is described below in terms of its orientation in the figures; references to upper, lower, above and below are not intended to be limiting.

[0023] refer to image 3 with Figure 4 , the injector 101 includes an injector body 160 , an injector nozzle 162 , a movably mounted injector needle 164 , and a control valve assembly 102 .

[0024] The injector 101 has a longitudinal axis A; with respect to the longitudinal axis A references to "axial" and "radial" are made below.

[0025] A spring 166 is disposed in the spring chamber 168 to bias the injector needle 164 toward a seated position in which fuel is prevented from being combusted via one or more spray holes (not shown) provided in the injector nozzle 162. A chamber (not shown) is injected. Under the control of the control valve assembly 102, the injector needle 164 can be moved to an open position wherein fuel can be injected through the spray orifice.

[0026] The control valve assembly 102 of the...

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PUM

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Abstract

A subassembly for a high pressure fuel injector control valve, comprising a control valve member and a sleeve attached to a stem of the control valve member, the sleeve extending along at least a partial axial length of the stem of the control valve member, and wherein a clearance, provided between the sleeve and the control valve member, is in fluid communication with the control chamber such that during use, pressure compensation occurs, as the sleeve is caused to expand and seal against the control valve bore, thereby preventing leakage of fuel within the control valve assembly.

Description

technical field [0001] The present invention relates to a control valve for a fuel injector, in particular to a control valve assembly for a fuel injector in a high pressure diesel injection system of an internal combustion engine. Background technique [0002] Such as figure 1 A known fuel injector 1 illustrated in FIG. 1 includes an injector body 60 , an injector nozzle 62 and a movably mounted injector needle 64 . A spring 66 is disposed in a spring chamber 68 to bias the injector needle 64 toward a seated position in which fuel is prevented from burning through one or more spray holes (not shown) provided in the injector nozzle 62 . A chamber (not shown) is injected. [0003] The injector 1 further comprises a control valve assembly 2 which controls the movement of the injector needle 64 . The control valve assembly 2 includes a control valve body 6 , a control valve member 4 reciprocatable within a bore 8 provided in the control valve body 6 , and a control chamber 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M63/00F02M47/02
CPCF02M47/027F02M63/0071F02M63/0078F02M2200/16
Inventor P·勒格朗
Owner DELPHI TECH IP LTD
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