Solenoid valve mechanism and high-pressure fuel supply pump

A solenoid valve and magnetic core technology, applied in the direction of fuel injection pump, fuel injection device, valve device, etc., can solve the problem that the valve core cannot contact the valve seat and the valve cannot be closed.

Pending Publication Date: 2022-06-21
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electromagnetic suction valve is a normally open electromagnetic suction valve that closes the valve core by energizing the electromagnetic coil and opens the valve when the current to the electromagnetic coil is cut off. There is a gap between the spools. In the absence of this gap, the spool cannot contact the valve seat and cannot close the valve (paragraph 0056)

Method used

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  • Solenoid valve mechanism and high-pressure fuel supply pump
  • Solenoid valve mechanism and high-pressure fuel supply pump
  • Solenoid valve mechanism and high-pressure fuel supply pump

Examples

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Embodiment Construction

[0030] Buffer chambers 10b, 10c communicating with the low-pressure fuel suction port 10a and the low-pressure fuel suction passage 10b are formed on the upper and lower surfaces of the pressure pulsation reducing mechanism 9 . In addition, although not shown in the drawings, a passage for communicating the upper side and the lower side of the pressure pulsation reducing mechanism 9 is formed in the holding member 9a.

[0031] like figure 2 As shown, the fuel passing through the buffer chambers 10b, 10c then reaches the suction passage 31b of the solenoid valve mechanism 300 through the low-pressure fuel suction passage 10e formed in the pump body 1 extending in the vertical direction. In addition, a suction passage 31b is formed in the up-down direction in the suction valve seat member 31 forming the suction valve seat 31a.

[0032] like figure 2 As shown, the terminal 46a is integrally molded with the connector 46, and the unmolded end is configured so that it can be con...

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PUM

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Abstract

The purpose of the present invention is to ensure a gap between a suction valve-side component and an armature-side component during valve closing regardless of the cumulative tolerance of a plurality of constituent components, and to reliably close the valve. A solenoid valve mechanism (300) is provided with: an armature assembly (36) and a magnetic core (33) that act a magnetic attraction force with each other; and a suction valve (30) configured so as to be able to come into separate contact with the armature assembly (36), the armature assembly (36) having: a first armature assembly part (36a) having an opposing surface (36ab) that opposes the magnetic core (33); a second armature assembly part (36b) which is integrated with the first armature assembly part (36a); and a press-fit part (36c) for fixing the first armature assembly part (36a) and the second armature assembly part (36b), the press-fit length (L1) of the press-fit part (36c) being set to a length at which the second armature assembly part (36b) is separated from the suction valve (30) when the suction valve (30) is closed.

Description

technical field [0001] The present invention relates to a high-pressure fuel supply pump for pressure-feeding fuel to a fuel injection valve of an internal combustion engine, and more particularly to a fuel supply pump equipped with an electromagnetic suction valve for adjusting the amount of discharged fuel. Background technique [0002] Among the internal combustion engines of automobiles, such as direct-injection internal combustion engines that directly inject fuel into the combustion chamber, high-pressure fuel supply pumps equipped with electromagnetic suction valves that can pressurize fuel and adjust it to discharge at a desired fuel flow rate are widely used. . [0003] For example, in the electromagnetic suction valve in the high-pressure fuel supply pump of Japanese Patent Laid-Open No. 2019-27355 (Patent Document 1), an armature, a valve stem, and a valve core are equipped, and the armature is moved by magnetic attraction force, so The valve stem is clamped to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/36F16K31/06F02M59/46
CPCF02M59/366F02M59/102F04B53/1082F16K27/029F16K31/0655F16K31/0675
Inventor 田村真悟山田裕之小仓清隆桥田稔
Owner HITACHI ASTEMO LTD
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