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High-pressure fuel supply pump equipped with electromagnetically driven inlet valve

An electromagnetically driven, high-pressure fuel technology, which is applied to fuel injection devices, fuel injection pumps, and fuel injection devices with special measures to affect the magnetic flux. Fluctuation in ejection amount, effect of eliminating unstable behavior

Active Publication Date: 2014-09-24
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, with such a structure, the space between the valve element and the stopper into which the spring enters becomes a hermetically sealed space isolated from the surrounding fluid, which affects the responsiveness of the valve element.

Method used

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  • High-pressure fuel supply pump equipped with electromagnetically driven inlet valve
  • High-pressure fuel supply pump equipped with electromagnetically driven inlet valve
  • High-pressure fuel supply pump equipped with electromagnetically driven inlet valve

Examples

Experimental program
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Effect test

no. 1 example 〕

[0036] based on figure 1 Turning to FIG. 4, a first embodiment of the high-pressure fuel supply pump embodying the present invention will be described. due to figure 1 It is not possible to mark small parts in the symbol, so as far as the symbols in the description are concerned, there will be a figure 1 Parts without symbols in , are shown with symbols in the enlarged drawings described later.

[0037] The pump housing 1 is provided with a recessed portion 12A forming a bottomed cylindrical space with an open end, and the hydraulic cylinder 20 is inserted into the recessed portion 12A from the open end side. The outer periphery of the hydraulic cylinder 20 and the pump housing 1 are sealed by a crimping portion 20A. In addition, since the plunger 2 is slidingly fitted to the hydraulic cylinder 20, the inner peripheral surface of the hydraulic cylinder 20 and the outer peripheral surface of the plunger 2 are sealed by the fuel that penetrates between the sliding fitting sur...

no. 2 example

[0092] A second embodiment will be described based on FIG. 5(A) and FIG. 5(B). Parts having the same functions as those in the first embodiment are denoted by the same symbols. The electromagnetically driven suction valve of the second embodiment shown in FIG. 5(A) and FIG. 5(B) is a so-called outward opening type valve provided with a valve element 203 on the pressurization chamber 12 side of a valve seat 214S. The valve element 203 is arranged closer to the pressurization chamber side (downstream side of the valve seat) than the valve seat 214S, and a valve stopper S0 for restricting the valve opening position of the valve element 203 is provided between the pressurization chamber 12 and the valve element 203 . Through-holes SN1-SN6 (corresponding to slits Sn1-Sn3 of the first embodiment) forming fuel passages are provided on the valve stopper S0 on the outer side in the circumferential direction of the valve body 203 . One end of the cylindrical fuel introduction passage ...

no. 3 example

[0095]A third embodiment will be described based on FIG. 6(A) and FIG. 6(B). Parts having the same functions as those in the first embodiment are denoted by the same symbols. The electromagnetically driven suction valve of the third embodiment shown in FIG. 6(A) and FIG. 6(B) is a so-called outward opening type valve provided with a valve element 203 on the side of the pressurizing chamber 12 of the valve seat 214S. The valve element 203 is arranged on the pressurization chamber side (downstream side of the valve seat) from the valve seat 214S, and a valve stopper for restricting the valve opening position of the valve element 203 is provided between the pressurization chamber 12 and the valve element 203 S0. Through-holes SN1-SN6 (corresponding to the notches Sn1-Sn3 of the first embodiment, corresponding to the notches Sn1-Sn3 of the second embodiment) are provided to pass through the valve stopper S0 obliquely outward from the end surface of the valve stopper S0 on the pre...

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Abstract

In order to inhibit spring and valve instability due to the introduced pressure when pressure in a pressurization chamber is introduced into a spring accommodating space in which a spring, which energizes the valve in the closing direction and which is provided between a valve stopper and a valve, is inserted, the present invention is configured such that: a pressure equalization hole connecting a peripheral fluid passage and the spring accommodating space provided between the valve and the valve stopper is provided to the valve stopper located between the valve and the pressurization chamber; and the spring-accommodating-space-side opening of the pressure equalization hole opens to a position further inside than the diameter of the spring. As a result, pressure from the pressurization chamber can be introduced to the inside of the spring without traversing the spring, thereby resolving spring and valve instability due to the introduced pressure. Moreover, the force applied to the valve when closing the valve is stabilized, which makes it possible to stabilize valve closing timing.

Description

technical field [0001] The present invention relates to a high-pressure fuel supply pump having an electromagnetically driven suction valve, and more particularly to a high-pressure fuel supply pump in which the electromagnetically driven suction valve is a so-called outward-opening valve having a valve element on the pressurizing chamber side of the valve seat. Background technique [0002] Conventionally, in this type of high-pressure fuel supply pump, for example, as described in Japanese Patent Laid-Open No. 2009-203987 or Japanese Patent Laid-Open No. 2006-291838, the valve body (valve) is formed by a cylindrical member, and the valve body It is arranged on the pressurized chamber side (downstream side of the valve seat) than the valve seat, and a valve stopper that restricts the valve opening position of the valve core is provided between the pressurized chamber and the valve core. A spring for applying force to the valve core in the closing direction is arranged betwe...

Claims

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Application Information

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IPC IPC(8): F02M59/34F02M51/00F02M59/36F02M59/46
CPCF02M59/368F02M21/0245F04B49/225F02M59/464F02M2200/304F02M2200/08F02M59/366F02M59/462F02M2200/50Y02T10/30F04B17/04
Inventor 早谷政彦臼井悟史町村英纪河野达夫有富俊亮田村真悟
Owner HITACHI ASTEMO LTD
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