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fuel injection valve

A fuel injection valve, fuel injection technology, applied in the direction of fuel injection device, charging system, machine/engine, etc., can solve the problem of unconsidered problems, and achieve the effect of high productivity and excellent atomization

Active Publication Date: 2018-12-28
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in Patent Document 1, such a subject is not considered

Method used

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Examples

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Embodiment 1

[0036] Regarding the first embodiment of the present invention, using figure 1 It will be explained until Fig. 9 .

[0037] refer to figure 1 , the overall structure of the fuel injection valve 1 will be described. figure 1 It is a longitudinal sectional view showing a section (longitudinal section) along the central axis 1a of the fuel injection valve 1 . The central axis 1 a coincides with the axis (valve axis) of the movable element 27 integrally formed with the valve body 17 described later, and coincides with the central axis of the cylindrical body 5 described later. In addition, the central axis line 1a also coincides with the axis line of the valve seat 15b described later.

[0038] The fuel injection valve 1 is configured such that the fuel flow path 3 substantially extends along the central axis 1 a inside a cylindrical body 5 made of a metallic material. The cylindrical body 5 is formed into a stepped shape along the direction of the central axis 1 a by using...

Embodiment 2

[0127] Below, refer to Figure 12 A second embodiment of the present invention will be described. Figure 12 is the expression from figure 2 The cross-sectional view of the same cross-section of the valve seat member and the nozzle plate is observed in the direction of the III-III arrow. In this example, from Figure 12 The sectional view viewed in the direction of the II-II arrow with figure 2 same. In this case, figure 2 The nozzle plate 21n in the above may be composed of a composite member of the valve seat member 15 and the nozzle plate 21n.

[0128] In the second embodiment, the side surface (side wall surface) 200c of the vertical passage 200 in the first embodiment, the side surface (side wall surface) 211c of the transverse passage 211, and the inner peripheral surface (side wall surface) 212c of the swirl chamber 212 are groove-shaped. It is formed on the front end surface 15t of the valve seat member 15 . A swirl chamber bottom surface 212b inclined with resp...

Embodiment 3

[0131] Below, refer to Figure 13 A third embodiment of the present invention will be described. Figure 13 is the expression from image 3 The sectional view of the same section as the sectional view of the valve seat member and the nozzle plate viewed in the direction of the III-III arrow. The plan view of the side of the upper end surface 21nu of the nozzle plate 21n of this embodiment and figure 2 The top view shown is the same.

[0132] In the third embodiment, the structures of the top surface of the swirl chamber 212 and the top surface of the lateral passage 211 are changed from those of the first embodiment. That is, the top surface 212ce of the swirl chamber 211 and the top surface 211ce of the lateral passage 211 are formed in a convex shape on the front end surface 15t of the valve seat member. The swirl chamber top surface 212ce is inclined similarly to the swirl chamber bottom surface 212b. That is, the inclination direction and inclination angle of the swir...

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PUM

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Abstract

An object of the present invention is to provide a fuel injection valve that can inject swirling fuel in a direction inclined with respect to the central axis of the fuel injection valve, has excellent fuel atomization, and has high productivity. The fuel injection valve has a fuel injection hole (220) and a swirl chamber (212) on the downstream side of the valve seat (15b). An inlet of the fuel injection hole (220) is opened and a fuel swirl flow path is provided around the inlet. ; The transverse passage (211) supplies fuel to the swirl chamber (212), and at least joins the plate-shaped member (21n) formed with the fuel injection hole (220), the bottom surface of the swirl chamber (212), and the bottom surface of the transverse passage (211) In the front end surface (15t) of the nozzle body side having the valve seat (15b), the contact portion (21nu) between the plate-shaped member (21n) and the front end surface (15t) of the nozzle body side is composed of a flat surface, The bottom surface of the swirl chamber (212) is formed to be inclined relative to the plane of the abutment portion (21nu), and the central axis of the fuel injection hole (220) is formed perpendicular to the bottom surface of the swirl chamber (212).

Description

technical field [0001] The present invention relates to a fuel injection valve that generates swirling fuel that flows while swirling upstream of a fuel injection hole and injects it from the fuel injection hole. Background technique [0002] A fuel injection valve described in JP 2004-278464 A (Patent Document 1) is known as background art in this technical field. The fuel injection valve has a valve seat member formed with a valve seat, and a passage plate and an injection plate which are sequentially overlapped and combined on the front end surface of the valve seat member. The plurality of fuel injection holes are formed with guide paths for distributing and guiding the fuel passing through the valve seat to the plurality of fuel injection holes on the passage plate. The ring-shaped thin-walled part welded to the front end surface of the valve seat member connected to the outer periphery of the thick-walled part with a plate thickness thinner than the thick-walled part ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/18
Inventor 斋藤贵博小林信章兵藤稔吉村一树
Owner HITACHI ASTEMO LTD
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