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Fuel injection valve

A technology of fuel injection valve and fuel flow path, which is applied to fuel injection devices, charging systems, machines/engines, etc., and can solve problems such as difficulty in manufacturing, difficulty in forming injection holes, and deterioration of manufacturability

Inactive Publication Date: 2013-01-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be predicted that by increasing the inclination angle, the degree of micronization can be improved. However, for the formation of injection holes, the larger the inclination angle is, the more difficult it is to form the injection holes, and there is a problem that the manufacturability deteriorates.
In addition, in the fuel injection valve of Patent Document 2, when the fuel passes over the inclined portion and is introduced into the injection hole, the flow of the fuel bends at an acute angle, which contributes to atomization of the fuel. However, the protruding injection hole plate Machining and forming nozzle holes on the inclined portion of the nozzle hole plate are difficult points in manufacturing

Method used

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no. 1 approach

[0050] figure 1 The main structure of the fuel injection valve according to the first embodiment of the present invention is shown. The fuel injection valve 1A is configured as an electromagnetically driven fuel injection valve that can be incorporated into a spark ignition type internal combustion engine and used. The fuel injection valve 1A includes: a valve needle 3 housed in a reciprocating state inside the valve body 2 ; and an orifice plate 4 attached to the front end portion 2 a of the valve body 2 . The needle 3 is supported by the inner peripheral surface of the valve body 2 and the needle guide 5 in a state capable of reciprocating in the direction of the axis Ax. The tip portion 3 a of the needle 3 is configured to be seated on or separated from a valve seat 6 formed on the valve body 2 . A plurality of injection holes 7 are formed in the injection hole plate 4 , and the plurality of injection holes 7 communicate with the inside and outside of the injection hole p...

no. 2 approach

[0058] Second, refer to Figure 4 A second embodiment of the present invention will be described. The second embodiment is the same as the first embodiment except for the shape of the needle. Therefore, the same reference numerals are assigned to the same configurations as those of the first embodiment in the drawings, and description thereof will be omitted. Also, for the basic structure of the second embodiment, refer to figure 1 Wait.

[0059] Figure 4 It is an enlarged cross-sectional view of an orifice plate and its surroundings of the fuel injection valve according to the second embodiment. As shown in the figure, the fuel injection valve 1B includes a needle 30 on which a protrusion 31 is formed facing the recess 15 and protruding toward the side closer to the orifice plate 4 . The protruding amount of the protrusion 31 is adjusted so that when the fuel injection valve 1B is seated, the protrusion 31 is submerged in the recess 15, and when the fuel injection valve...

no. 3 approach

[0062] Second, refer to Figure 5 as well as Figure 6A third embodiment of the present invention will be described. The third embodiment corresponds to an embodiment in which a part of the first embodiment or the second embodiment is modified, and the parts other than the modified points have the same configuration as the above-mentioned embodiment. Therefore, description of the same configuration as that of the first embodiment or the second embodiment is omitted.

[0063] Figure 5 It is an enlarged cross-sectional view of an orifice plate and its surroundings of the fuel injection valve according to the third embodiment. Figure 6 is shown viewed from the direction of arrow VI Figure 5 An explanatory diagram of the state of the orifice plate shown. As shown in these figures, the fuel injection valve 1C includes an orifice plate 32 in which an injection hole 33 is formed, and a groove 34 communicating with the injection hole 33 is formed in the orifice plate 32 . The...

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Abstract

A fuel injection valve (1A) comprises: a needle (3) which is contained in a valve body (2) so as to be able to reciprocate; a nozzle plate (4) which is mounted to the front end (2a) of the valve body (2) and in which nozzle holes (7) communicating with the inside and outside of the valve body (2) are formed; and a valve seat (6) on which the needle (3) is seated and unseated so that a fuel flow path (10) which leads to the nozzle holes (7) of the nozzle plate (4) through the outer periphery of the needle (3) can be closed and opened. The nozzle plate (4) has formed therein a recess (15) which is recessed in the direction of the axis of the needle (3) so as to cause the fuel, which flows toward the nozzle holes (7) after passing through the valve seat (6), to descend along the nozzle plate (4) from the level of the inlets (20) of the nozzle holes (7), ascend, and then reach the inlets (20) of the nozzle holes (7).

Description

technical field [0001] The present invention relates to a fuel injection valve equipped with an orifice plate having injection holes formed on a front end portion of a valve body. Background technique [0002] There is known a fuel injection valve in which injection holes are inclined in a direction opposite to a flow direction of fuel flowing toward an inlet of the injection hole on an injection hole plate (Patent Document 1). In addition, there is known a fuel injection valve in which the shape of the orifice plate itself is studied so that the central portion of the orifice plate protrudes from the periphery, and the injection holes are formed in an inclined portion ( Patent Document 2). In addition, there is Patent Document 3 as a prior art document related to the present invention. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 9-32695 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2008-121517 [0005] Patent Document 3: Japanese Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18
CPCF02M61/1853F02M61/1846F02M61/162F02M51/0653F02M61/1806F02M61/186
Inventor 金子真也清水信幸坂井洋志黑川敏邦
Owner TOYOTA JIDOSHA KK
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