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Electromagnetic fluid control valve

Imported: 24 Feb '17 | Published: 06 Jan '04

Yasuo Kato

USPTO - Utility Patents

Abstract

A retainer is coupled around a shaft of an electromagnetic fluid control valve. A first projection is provided at one axial end of the retainer. A second projection is provided at the other axial end of the retainer. A central portion of a valve member is sandwiched between a flat surface of the first projection and a washer. A central portion of a diaphragm is sandwiched between a flat surface of the second projection and an end surface of a moving core

4.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description which is to be read in conjunction with the accompanying drawings, in which:

FIG. 1 is a vertical cross-sectional view showing an electromagnetic valve in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram showing an evaporated fuel purge system in accordance with the preferred embodiment of the present invention;

FIG. 3A is a plan view showing a front end surface of a valve member adopted in the electromagnetic valve in accordance with the preferred embodiment of the present invention;

FIG. 3B is a plan view showing a rear end surface of the valve member adopted in the electromagnetic valve in accordance with the preferred embodiment of the present invention;

FIG. 4 is a vertical cross-sectional view enlargedly showing part of the electromagnetic valve shown in FIG. 1;

FIG. 5 is a perspective view showing a retainer used in the electromagnetic valve in accordance with the preferred embodiment of the present invention;

FIG. 6 is a transverse cross-section view, taken along a line V—V of FIG. 1, showing the positional relationship between the retainer and the valve opening in accordance with the preferred embodiment of the present invention; and

FIG. 7 is a cross-sectional view showing an electromagnetic valve previously proposed by the applicant.

Claims

1. An electromagnetic fluid control valve comprising:

2. The electromagnetic fluid control valve in accordance with claim 1, wherein said valve member has at least one ring-shaped projected portion provided on an end surface thereof, and said ring-shaped projected portion is deformed when a pressing force is applied between said flange of said shaft and said first retaining portion of said retainer.

3. The electromagnetic fluid control valve in accordance with claim 2, wherein said at least one ring-shaped projected portion is provided on both end surfaces of said valve member.

4. The electromagnetic fluid control valve in accordance with claim 2, wherein said valve member has two circular ridges as said at least one ring-shaped projected portion.

5. The electromagnetic fluid control valve in accordance with claim 1, wherein said valve body has a stopper for restricting an excessive shift movement of said shaft in the axial direction when said electromagnetic valve is in an opened state.

6. The electromagnetic fluid control valve in accordance with claim 5, wherein said stopper is formed on a partition wall protruding radially inward from a tubular wall of said valve body for separating said fluid passage into two passages.

7. The electromagnetic fluid control valve in accordance with claim 6, wherein an inner circular edge of said partition wall defines said valve opening.

8. The electromagnetic fluid control valve in accordance with claim 5, wherein said retainer has a central projection formed between said first retaining portion and said second retaining portion, and said central projection is brought into contact with said stopper of said valve body when said electromagnetic valve is in an opened state.

9. The electromagnetic fluid control valve in accordance with claim 8, wherein said central projection of said retainer includes a plurality of legs extending in radially outward directions from a main body of said retainer.

10. The electromagnetic fluid control valve in accordance with claim 1, wherein said first retaining portion has a flat surface extending perpendicularly to the axial direction for providing surface contact between said valve member and said retainer.

11. The electromagnetic fluid control valve in accordance with claim 1, wherein said second retaining portion has a flat surface extending perpendicularly to the axial direction for providing surface contact between said diaphragm and said retainer.

12. The electromagnetic fluid control valve in accordance with claim 1, further comprising a communication passage for providing connection between said accommodation chamber and the outside of said valve body.

13. The electromagnetic fluid control valve in accordance with claim 12, wherein said communication passage includes an orifice which substantially restricts a flow rate of fluid in said communication passage.

14. The electromagnetic fluid control valve in accordance with claim 1, wherein said diaphragm has a central portion and an easily deformable portion extending around said central portion, and said central portion has a higher rigidity than said easily deformable portion.

15. The electromagnetic fluid control valve in accordance with claim 14, wherein said central portion of said diaphragm is coupled around the solenoid shaft.

16. The electromagnetic fluid control valve in accordance with claim 14, wherein said central portion of said diaphragm is thicker than said easily deformable portion extending around said central portion.

17. A method for assembling an electromagnetic fluid control valve,