Liquid purification or separation – Filter – With flow controller for material being treated
Patent
1996-10-30
1998-06-16
Savage, Matthew O.
Liquid purification or separation
Filter
With flow controller for material being treated
210495, 210499, B01D 3502
Patent
active
057664714
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mounting structure of a filter which is mounted to a body of a solenoid valve so as to prevent invasion of dust through an inlet opened at the body.
BACKGROUND ART
Conventionally, in a solenoid valve or the like used in hydraulic control of an automatic transmission of an automobile and attached to a block formed therein with a hydraulic circuit so as to constitute a compound valve, a filter is, in general, mounted at the inlet side of the solenoid valve fitted in the foregoing block. FIGS. 6 and 7 show such filter mounting structures, respectively.
In FIG. 6, a filter 51 is fitted, from the exterior, into a mounting portion 63 opened continuous with an inlet 62 provided at one axial end of a body 61 of a solenoid valve, and then is fixed by a C-shaped snap ring 71. The filter 51 includes a frame portion 52 made of synthetic resin and a net filter portion 53 stretched thereover and is formed integral into a bottomed cylindrical shape opening toward the inlet 62, with a flange portion 54 at the open edge fitted into the mounting portion 63. The flange portion 54 is pressed against a step portion 61a at the side of the body 61 by means of the snap ring 71 which is inserted around the filter 51 and fitted into a mounting groove 63a formed in the mounting portion 63, so that the filter 51 is ensured to be oil tight relative to the body 61 and prevented from coming off the body 61.
On the other hand, in FIG. 7, a filter 55 is fitted into a mounting portion 67 opened continuous with an inlet 66 provided at one axial end of a body 65 of a solenoid valve, and then, by caulking the peripheral edge of an opening portion 67, the filter 55 is fixed to the body 65 together with a tubular cover member 75 fitted thereover. The filter 55 is formed integral by a frame portion 56 made of synthetic resin and a net filter portion 57 stretched thereover and has a conical shape gradually opening toward an inlet 62. The filter 55 is ensured to be oil tight relative to the solenoid valve body 65 by means of an O-ring 76 fitted over the cover member 75.
However, in such conventional mounting structures, since the filter 51, 55 is fitted into the mounting portion 63, 67 provided at the body 61, 65 so as to be fixed, an area at the filter 51, 55 where the oil can flow is rendered small. Accordingly, for compensating this, it is necessary that the filter 61, 65 projects outward from the body 61, 65. Thus, there has been a problem that the overall size of the body 61, 65 is increased and a mounting counterpart of the solenoid valve, for example, the foregoing block, is subjected to the limitation in shape of a mounting portion of the solenoid valve such as a mounting hole so that the degree of freedom on designing is reduced.
The present invention has been made in view of such a conventional problem and has an object to provide a mounting structure of a filter of a solenoid valve, wherein the overall size of the solenoid valve can be reduced, and simultaneously, the degree of freedom on designing at a mounting portion of the solenoid valve can be increased.
DISCLOSURE OF THE INVENTION
For solving the foregoing problem, in the present invention, a mounting structure of a filter to be attached to a body of a solenoid valve for preventing invasion of dust through an inlet opened at the body, is such that the filter comprises an annular outer frame portion encircling the inlet and abutting the body in all circumference, an elastic inner frame portion dividing the inside of said outer frame portion into a plurality of portions and spacing apart from said body, and net filter portions closing opening portions formed by the outer frame portion and the inner frame portion, and that the inner frame portion is provided with a retaining convex portion projecting toward the inlet, while the body is provided with retaining means for retaining the retaining convex portion which is moved in a projecting direction of the inner frame portion, following elastic deformation thereof.
In such a str
REFERENCES:
patent: 3108610 (1963-10-01), De See
patent: 4187178 (1980-02-01), Brown
Jatoco Corporation
Savage Matthew O.
Tosok Corporation
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