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A common rail injector

A technology of common rail injectors and injectors, which is applied in the direction of machines/engines, fuel injection devices, engine components, etc., and can solve problems affecting the stability, reliability, high temperature, and increased energy loss of injectors

Active Publication Date: 2016-08-24
CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More high-pressure fuel will leak into the low-pressure oil circuit, which will increase energy loss and limit the increase of fuel injection pressure, resulting in higher temperature in the low-pressure oil circuit of the injector, which will affect the stability and reliability of the injector. sex

Method used

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Examples

Experimental program
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Embodiment Construction

[0030] A common rail injector control chamber of the present invention can refer to the attached figure 1 , 2 description of.

[0031] The sliding spool composed of the control piston 1 of the injector, the injector body 3, the orifice plate A 10, the orifice plate B 17, the spool C 8 and the spool D 16, and the ball valve 22 form the control valve. The control chamber 2 has only one oil passage connected to the high-pressure oil passage and the low-pressure oil passage. This oil passage is both the oil inlet passage and the oil outlet passage of the control chamber 2, and there is no throttle hole. The control chamber 2 on the top of the injector body 3 has two oil passages, one oil passage is connected with the high-pressure oil passage and the low-pressure oil passage, and the other oil passage G5 is connected with the bottom oil chamber 6 of the spool C8 to prevent the spool from Oil resistance occurs during the movement, and the bottom 7 of the spool C is guided on the ...

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Abstract

The invention discloses a new type of common rail fuel injector, which includes a control valve composed of a control piston, a fuel injector body, a sliding valve core and a ball valve; the top of the sliding valve core has a top oil chamber connected with the ball valve, and the top oil chamber A spool spring is arranged inside to press against the top of the sliding spool; the middle circumferential direction of the sliding spool has a middle oil chamber, which communicates with the top oil chamber through the throttle hole; the lower circumferential direction of the sliding spool has a The lower oil chamber communicated with the passage; the bottom of the sliding spool has a bottom oil chamber communicated with the control chamber on the top of the control piston; the control chamber communicates with the middle oil chamber through an oil passage; the lower oil chamber of the sliding spool has a A boss, the upper surface of the boss cooperates with the top surface of the lower oil chamber to form a sealing ring to control the communication between the lower oil chamber and the middle oil chamber. The invention controls the pressure of the control chamber through the sliding valve core, thereby controlling the fuel injector in the fuel injection process, greatly reducing the dynamic oil return of the fuel injector, and improving the fuel injection efficiency of the fuel injector.

Description

technical field [0001] The invention belongs to the field of fuel injection systems for internal combustion engines, and in particular relates to a common rail fuel injector. Background technique [0002] In order to meet increasingly stringent emission regulations, fuel system injection pressures are getting higher and higher. At present, most common rail injectors form a control chamber at the upper end of the control piston, and the control chamber has an oil inlet orifice and an oil outlet orifice. The oil inlet orifice is connected to the high-pressure oil passage, and the oil outlet orifice is connected to the low-pressure oil passage through the solenoid valve. According to its working principle, the fuel injector controls the rise or fall of the fuel pressure in the control chamber, thereby passing The pressure difference controls the axial up and down movement of the control piston of the fuel injector. Similar fuel injectors are disclosed in CN1773098A, CN1015480...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/10F02M61/20
Inventor 郭立新缪雪龙宋永平傅立运杨海涛夏兴兰居钰生
Owner CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST
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