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Fuel injection valve

A fuel injection valve and fuel technology, applied in the direction of fuel injection devices, charging systems, engine components, etc., can solve the problems of fuel flow rate reduction, guide fuel, etc., to achieve the effect of suppressing flow rate reduction and realizing atomization

Inactive Publication Date: 2012-05-23
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the technique described in Patent Document 1, since there is no wall between adjacent swirl chambers, fuel cannot be efficiently guided from the chamber (central chamber) to the swirl chamber, and the flow rate of fuel may decrease.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The fuel injection valve 1 of the first embodiment will be described.

[0034] [Structure of Fuel Injection Valve]

[0035] figure 1 is an axial sectional view of the fuel injection valve 1 . This fuel injection valve 1 is used in an automobile engine and the like.

[0036] The fuel injection valve 1 has: a magnetic cylinder body 2, a core cylinder body 3 accommodated in the magnetic cylinder body 2, a valve body 4 slidable in the axial direction, a valve shaft 5 integrally formed with the valve body 4, and a The valve seat part 7 of the valve seat 6 that is closed by the valve body 4, the nozzle plate 8 with the injection hole that injects fuel when the valve is opened, the electromagnetic coil 9 that makes the valve body 4 slide in the valve opening direction when the valve is energized, and the yoke 10 that induces magnetic flux .

[0037] The magnetic cylinder 2 is made of, for example, a metal pipe formed of a magnetic metal material such as electromagnetic sta...

Embodiment 2

[0075] The fuel injection valve 1 of the second embodiment will be described. In the fuel injection valve 1 of the first embodiment, the radially outer side wall 45 a is formed on the tangent line of the central chamber 42 with respect to the central chamber 42 of the communicating passage 45 . With this structure, in the fuel injection valve 1 of the second embodiment, a stepped portion 45c is formed at the connecting portion between the side wall 45a of the communication passage 45 and the central chamber 42 .

[0076] Figure 6 It is a plan view of the nozzle plate 8 viewed from one end side in the axial direction and a diagram showing the flow of fuel. Figure 6 (a) represents the whole nozzle plate, Figure 6 (b) is Figure 6 (a) An enlarged view of a portion indicated by a dotted line circle B.

[0077] Figure 6 As shown, a stepped portion 45c is formed at the connecting portion between the side wall 45a of the communication path 45 and the central chamber 42 . Th...

Embodiment 3

[0084] The fuel injection valve 1 of the third embodiment will be described. The fuel injection valve 1 of the first embodiment is formed such that the width of the communication passage 45 is constant when viewed from one end side in the axial direction. With this configuration, in the fuel injection valve 1 according to the third embodiment, the width viewed from one end side in the axial direction is formed such that the communication passage 45 narrows toward the swirl imparting chamber 46 .

[0085] Figure 7 It is a plan view of the nozzle plate 8 viewed from one end side in the axial direction and a diagram showing the flow of fuel. Such as Figure 7 As shown, with respect to the central chamber 42 of the communication passage 45, the radially inner side wall 45b is formed as follows, that is, the radially outer side wall 45a is inclined relative to the central chamber 42, and the swirl imparting chamber 46 is relatively The central chamber 42 is close to the radiall...

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Abstract

The invention provides a fuel injection valve. Fuel is high-effectively guided from a central chamber to a vortex chamber, thereby preventing the flowing speed of the fuel from being reduced and realizing micronization of the fuel. A guiding wall for guiding the fuel in communicated channels is formed among the communicated channels connected with the central chamber.

Description

technical field [0001] The present invention relates to a fuel injection valve used as a fuel injection valve for an engine. Background technique [0002] As such a technique, the technique described in the following patent document 1 is disclosed. This gazette discloses that a swirling groove is formed in the valve body to generate a swirling flow in the chamber main body. A vortex chamber protruding radially is formed on the chamber main body. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2009-197682 [0004] In the technique described in Patent Document 1, since there is no wall between adjacent swirl chambers, fuel cannot be efficiently guided from the chamber (central chamber) to the swirl chambers, and the fuel flow rate may decrease. Contents of the invention [0005] The present invention has been made with the above problems in mind, and an object of the present invention is to provide a fuel injection valve that efficiently guides fuel from a cente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M51/06F02M61/18
Inventor 大野洋史小林信章石井英二石川正典冈本良雄
Owner HITACHI AUTOMOTIVE SYST LTD
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