JPH0655014A - Fixing structure for strainer - Google Patents

Abstract

PURPOSE:To surely prevent the intrusion of foreign matters into a solenoid valve even without directly fixing a filter to a solenoid valve. CONSTITUTION:A groove 12 is formed on a bulb body 10 in an adjacent relation to the oil passage opening part 11 of the bulb body 10 in which the oil hydraulic circuit connection part 21 of the solenoid valve 20 is inserted, and a strainer 30 constituting a filter part made by forming a filter fixing part consisting of curved pawls 31, 32 capable of elastic deformation and plural holes in a mesh form with single sheet of metal plate is inserted into the groove 12. The filter part of the strainer 30 is adhered tightly with an end face 11a at the inside of the oil passage opening part 11 by the elastic force of the curved pawls 31, 32. Sizes of the plural holes of the filter part, the shape and the array can be optionally set and also since the size is not changed during utilization, the passage of the foreign matters to be removed is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strainer mounting structure used in a hydraulic circuit having a solenoid valve.

[0002]

2. Description of the Related Art Conventionally, for example, in a hydraulic control device for an automatic transmission, a strainer is provided in the hydraulic circuit communicating with the solenoid valve in order to prevent foreign matter generated in the hydraulic circuit from entering the solenoid valve. It is generally known to do so (for example, Japanese Patent Laid-Open No. 2-6
(See FIG. 1 of 6369 gazette). It is also known that a filter is directly attached to the hydraulic circuit connecting portion of the solenoid valve to prevent foreign matter from entering the solenoid valve (for example, Japanese Utility Model Laid-Open No. 62-172874).
(See the official gazette).

[0003]

In the former of those described in the prior art, unless a strainer is provided in all hydraulic circuits communicating with the solenoid valve, foreign matter may enter the solenoid valve, and the strainer may be installed. There is a problem that foreign matter in the oil passage from the strainer to the solenoid valve cannot be removed.

Further, in the latter, although there is no problem as described above, the solenoid valve itself becomes large and a compact valve body is required because the filter holding member is required at the hydraulic circuit connecting portion of the solenoid valve. There is a problem that it can not be assembled into.

Further, in the conventional strainer or filter, since the filter portion is formed by the linear member, the mesh of the linear member is spread by the foreign matter and the size of the mesh shifts to allow the foreign matter to pass through. I was afraid.
Therefore, a method of using a hard material for the linear member to prevent the mesh from shifting can be considered, but it is difficult to assemble the hard linear member into a mesh shape, and it also causes an increase in cost. Become.

The present invention has been made in view of the above problems, and an object thereof is to ensure that foreign matter does not enter the solenoid valve without directly attaching a filter to the solenoid valve. It is to provide a filter mounting structure that can be prevented.

[0007]

In order to achieve the above object, a strainer mounting structure according to the present invention has a structure in which a valve body is adjacent to an oil passage opening portion of a valve body into which a hydraulic circuit coupling portion of the solenoid valve is inserted. A strainer with a groove formed in the body and a filter fixing part consisting of curved claws that can be elastically deformed and a filter part consisting of a plurality of holes formed in a mesh shape was fitted into this groove It is characterized by.

[0008]

According to the strainer mounting structure having the above structure, the strainer is elastically attached to the groove in the hydraulic circuit adjacent to the solenoid valve by the filter fixing portion composed of the curved claw. Further, the filter unit having the plurality of holes functions as a foreign matter removing unit. Then, the size, shape and arrangement of the plurality of holes in the filter portion are arbitrarily set, and the size and shape of the formed holes do not change during use.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a first embodiment of the present invention in a partial cross section, and FIG. 2 is a sectional view taken along the line A--A of FIG. Reference numeral 10 in the drawing denotes a valve body, and a solenoid valve 20 is fixed to an oil passage opening 11 of the valve body 10 by a bolt or the like in a state where the hydraulic circuit coupling portion 21 is inserted.
An O-ring 22 is fitted in the outer peripheral groove of the hydraulic circuit coupling portion 21, whereby the hydraulic circuit coupling portion 21 is hermetically fitted in the oil passage opening 11 of the valve body 10. Further, a rectangular groove 12 having a larger cross-sectional area than the oil passage opening 11 is formed in the valve body 10 adjacent to the oil passage opening 11. The strainer 30 shown in FIG. Are fixed by being inserted and fixed by the separate plate 13.

The strainer 30 is made by processing a single plate material made of a thin metal plate such as stainless steel, and has a filter fixing portion composed of curved inward facing claws 31, 31 and 32 at the top and bottom thereof. In addition to the above, the central portion thereof is provided with a filter portion formed by forming a plurality of fine holes 33 in a mesh shape. The hole 33 is formed so that the filter portion is slightly wider than the oil passage opening 11. The holes 33 are opened by etching, and their size, shape, and arrangement state are appropriately set according to the conditions of the hydraulic circuit using the solenoid valve 20.

This strainer 30 includes upper and lower curved claws 3.
1, 31 and 32 are elastically deformed inward, pushed into the groove 12 of the valve body 10, and further pressed by the separate plate 13 from the upper side to be mounted in the valve body 10. Then, the filter portion of the strainer 30 is in close contact with the inner end surface 11a of the oil passage opening 11 by the elastic force of the curved claws 31, 31, and 32.

Since the strainer 30 is mounted as described above, when the solenoid valve 20 is open, the fluid flowing into the input port of the solenoid valve 20 passes through the plurality of holes 33 in the filter portion of the strainer 30. Then
The foreign matter in the fluid is dammed up at a portion other than the hole 33.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, the oil passage opening 11 in the valve body 10 is shorter than the hydraulic circuit coupling portion 21 of the solenoid valve 20, the hydraulic circuit coupling portion 21 projects into the groove 12 of the valve body 10, and the strainer 30 makes this projection. The filter portion is pressed by the hydraulic circuit coupling portion 21. The filter portion of the strainer 30 is in close contact with the tip end surface of the hydraulic circuit coupling portion 21 due to the elastic force of the curved claws 31, 31 and 32.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, as shown in FIG. 6, a strainer 3 having a spherical filter portion formed by forming a plurality of holes 33 in a mesh shape.
0 is used, and the strainer 30 has the groove 12 with the central portion of the spherical filter portion inserted into the oil passage opening 11 of the valve body 10 from the inside.
It is arranged inside. Then, the filter portion of the strainer 30 is in close contact with the inner end edge of the oil passage opening 11 by the elastic force of the curved claws 31, 31, and 32.

FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, as in the third embodiment, a strainer 30 having a spherically protruding filter portion as shown in FIG. 6 is used, and the hydraulic circuit coupling portion 2 of the solenoid valve 20 is used.
The filter portion is disposed in the groove 12 while being pressed by 1. Then, the filter portion of the strainer 30 is in a state of being in close contact with the tip end surface of the hydraulic circuit coupling portion 21 by the elastic force of the curved claws 31 and 32.

In each of the above embodiments, the case where the curved claws serving as the filter fixing portion are curved inward in both the upper and lower directions has been described. However, as shown in FIG. 8, the upper curved claw 31 is curved outward. You may Further, the pair of upper curved claws 31 may be configured as one as in the lower curved claw 32. In any case, the curved claw may have any shape as long as it can be elastically deformed and has an elastic force toward the oil passage opening 11 when mounted in the groove 12 of the valve body 10. Is. And groove 1
It goes without saying that it is preferable to determine the shape in consideration of the ease of insertion into the inside.

[0018]

Since the present invention is configured as described above, it has the following effects.

Since the groove is formed in the valve body adjacent to the oil passage opening of the valve body into which the hydraulic circuit coupling portion of the solenoid valve is inserted, and the strainer is fitted in the groove, the solenoid valve itself. It is possible to prevent foreign matter in the hydraulic circuit from entering the solenoid valve without attaching a strainer to the.

A strainer composed of a single plate material having a filter fixing part made of a curved claw that is elastically deformable and a filter part having a plurality of holes formed in a mesh shape is provided in a groove formed in a valve body with a strainer of the filter fixing part. Since the elastic force is used to insert and fix the strainer, the strainer can be compactly mounted in the hydraulic circuit without using a separate mounting member.

Further, the size, shape and arrangement of the plurality of holes in the filter portion can be arbitrarily set, and since the size and shape of the formed holes do not change during use, they are long. It is possible to reliably prevent foreign matter from entering the solenoid valve over a period of time.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention in a partial cross section.

2 is a sectional view taken along the line AA of FIG.

3 is a perspective view of the strainer in FIG. 1. FIG.

FIG. 4 is a side view showing a second embodiment of the present invention in a partial cross section.

FIG. 5 is a side view showing a partial cross-section of a third embodiment of the present invention.

6 is a perspective view of the strainer in FIG.

FIG. 7 is a side view showing a partial cross-section of a fourth embodiment of the present invention.

FIG. 8 is a side view showing a state in which another strainer is attached in a partial cross section.

[Explanation of symbols]

 10 Valve Body 11 Oil Path Opening 12 Groove 20 Solenoid Valve 30 Strainer 31, 32 Curved Claw 33 Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Ichiko 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (72) Go Nasu 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aishi N AW Co., Ltd.

Claims (1)

[Claims] 1. A filter fixing part comprising a curved claw which is elastically deformable and has a groove formed in the valve body adjacent to an oil passage opening of a valve body into which a hydraulic circuit coupling part of a solenoid valve is inserted. The strainer mounting structure is characterized in that a strainer having a filter portion formed by forming holes in a mesh shape and made of one plate material is fitted into the groove.