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Fuel injection valve

A fuel injection valve and fuel technology, applied in fuel injection devices, charging systems, engine components, etc., can solve the problems that the pressure cannot be controlled correctly, the needle valve 140 cannot be accurately controlled, etc.

Active Publication Date: 2011-06-08
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pressure in the pressure control chamber 190 cannot be properly controlled
Thus, the needle valve 140 cannot be precisely controlled to properly open and close the nozzle hole 130

Method used

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  • Fuel injection valve
  • Fuel injection valve
  • Fuel injection valve

Examples

Experimental program
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Effect test

no. 1 example

[0017] Such as figure 1 As shown, for example, the fuel injection valve 1 is used as an accumulator fuel injection device for a diesel engine. The fuel injection valve 1 is supplied with high-pressure fuel from a pressure accumulation device (common rail, not shown). The fuel injection valve 1 injects high-pressure fuel into a combustion chamber of the engine. The fuel injection valve 1 includes an injection nozzle 10, an orifice 30, a valve body 40, a control valve 43, a lower body 50, a piezoelectric actuator 52, a driving force transmission member 53, and the like. The injection nozzle 10 , the orifice plate 30 , the valve body 40 and the lower body 50 are laminated in this order from below, and are screwed to each other with a lock nut 60 , thereby constituting the fuel injection valve 1 . The spray nozzle 10 includes a nozzle body 11 , a needle valve 14 , a cylinder body 20 and a coil spring 16 . The nozzle body 11 has a nozzle chamber 12 extending from the upper end ...

no. 2 example

[0058] Such as Figure 6As shown, in the second embodiment, the fuel passage 31a is different from the fuel passage 31 in the first embodiment. The diameter of the open end 36 a of the fuel passage 31 a is equal to or smaller than the distance between the outer wall of the small-diameter portion 21 of the barrel 20 and the inner wall of the nozzle chamber 12 . The distance from the central axis of the nozzle chamber 12 to the inner wall of the fuel passage 31 a on the radially outer side substantially coincides with the distance from the central axis of the nozzle chamber 12 to the inner wall of the nozzle chamber 12 .

[0059] That is, the nozzle chamber 12 has an imaginary center axis that is radially a first distance away from the first inner wall of the fuel passage 31a on the radially outer side. The imaginary central axis of the nozzle chamber 12 is radially at a second distance from the second inner wall of the nozzle chamber 12 . The first distance is substantially e...

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PUM

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Abstract

A fuel injection valve includes a housing 11 having a wall surface 34 on an opposite side of the nozzle hole 13. A fuel passage 31 opens in the wall surface 34, and communicates with a nozzle hole 13 through a nozzle cavity 12. The nozzle cavity 12 accommodates a valve element 14. A cylinder 20 is substantially in contact with the wall surface 34 at one end, and slidably accommodating one end of the valve element 14. The cylinder 20 partitions the nozzle cavity 12 substantially into a fuel accumulator chamber 18 and a pressure control chamber 19. The fuel accumulator chamber 18 accumulates fuel supplied from the fuel passage 31. The pressure control chamber 19 accumulates fuel for manipulating the valve element 14. The cylinder 20 has an outer wall defining a deflecting surface 27 for radially outwardly deflecting fuel flowing from the fuel passage 31.

Description

technical field [0001] The invention relates to a fuel injection valve. Background technique [0002] Such as Figure 7 As shown, according to US 6,705,551 B1 (JP-A-2003-506622), a fuel injection valve 100 has a fuel pressure accumulation chamber 180 and a pressure control chamber 190 separated from each other by a cylinder 200 . The fuel accumulator 180 has a nozzle chamber 120 accommodating a valve member (needle valve) 140 adapted to open and close the injection hole 130 . The nozzle chamber 120 accumulates high-pressure fuel to be injected through the injection hole 130 . The pressure control chamber 190 stores high-pressure fuel for controlling the opening and closing of the injection hole 130 using the needle valve 140 . [0003] The barrel 200 of the fuel injection valve 100 is substantially cylindrical. One end of the barrel 200 is in contact with the anti-spray hole wall surface 340 on the opposite side of the nozzle chamber 120 . The needle valve 140 is slidabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/10
Inventor 栗本直规鸟谷尾哲也松本修一大畑耕一
Owner DENSO CORP