JP2001029712A - Relief valve for filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relief valve in which the structure is simple, the number of parts can be decreased, which can be manufactured at a low cost, its operation can be smoothly and surely carried out, and its assemblability is good. SOLUTION: A valve port 22a is formed around a central part to which a valve element 27 is fixed in a valve seat 22. The platy valve element 27 is fixed at a central part to the valve seat 22, and almost arcuate spring part 25 is provided from the central part to the outer peripheral side, and a valve part for opening and closing the valve port 22a formed on the valve seat 22 in the outer peripheral part connected to the spring part is provided. When a differential pressure between a flow-in side chamber 6 and a filter chamber 7 becomes at least a specific pressure, the valve part of the seated valve element 27 is separated from the valve seat 22 being accompanied by a deflection of the almost arcuated spring part, the valve is opened, and a bypass is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relief valve for a filtration device (particularly for an oil filter suitably used for filtering lubricating oil of an internal combustion engine of an automobile).

[0002]

2. Description of the Related Art Conventionally, in an oil filter used for filtering lubricating oil of an internal combustion engine of an automobile, the performance of the oil filter is sometimes improved by using a relief valve. The relief valve is provided on a wall between the inflow-side chamber and the filtration-side chamber separated by the filtration element housed in the casing. Referring to FIG. 4, a conventional example in which a relief valve is used for an oil filter will be described. Referring to FIG. 4, the oil flows into an outer chamber (6) of a filtration element (1) housed in a casing (11) having a top plate (12). Oil flows in through the hole (14), passes through the outer chamber (6) and passes through the inner chamber (7), and is filtered.The outlet (1) is formed in the inner chamber (7).
The oil is allowed to flow out from 5). In this type of oil filter, the central part of the side facing the outlet (15) of the inner chamber (almost the center position on the top plate side of the filtration element (1)) Further, a relief valve (31) capable of communicating the outer chamber (6) and the inner chamber (7) is provided.

This relief valve (31) opens when the differential pressure between the inflow side chamber and the filtration chamber is equal to or higher than a predetermined pressure, and when the oil pressure increases with an increase in the rotation speed of the filter relief valve engine. Alternatively, when the filter medium is clogged by contaminants and the oil pressure is increased, the valve is opened to form a bypass, and the supply and circulation of oil are performed properly and sufficiently.

The above-mentioned relief valve (31) is connected to an end plate (4) of the filter medium as shown in FIG. 4, and is housed in a cylindrical case (32) having a cutout on the side wall. (3
3), the valve body (34) made of a hard plate material such as a metal plate is pressed to close the valve port (4a), and as the oil pressure increases, the valve element (34) is closed.
It is a structure that opens and closes apart from a).

[0005]

The conventional relief valve (31) has a cylindrical case (32) and a coil spring (3).
3), the valve element (34) is required, the number of parts is large, the cost tends to be high, and the assemblability is not good.

An object of the present invention is to improve the valve structure of a relief valve, to have a simple structure, to reduce the number of parts, to manufacture it at low cost, and to move it smoothly and reliably. Another object of the present invention is to provide a relief valve having good assemblability.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a filter provided on a wall between an inlet chamber and a filter chamber separated by a filter element housed in a casing, the differential pressure between the inlet chamber and the filter chamber being provided. Is opened at a predetermined pressure or more, a relief valve for a filtration device, which is fixed at a center portion with respect to a valve seat, has a substantially arc-shaped spring portion from the center portion toward the outer peripheral side, and is connected to the spring portion. A plate-shaped valve element having a valve portion that opens and closes a valve port formed in a valve seat, and a valve seat having a valve port formed around a central portion to which the valve element is fixed. This is a relief valve for a filtration device.

With the above arrangement, when the differential pressure between the inflow-side chamber and the filtration chamber becomes equal to or higher than a predetermined pressure, the valve portion of the seated valve body is moved from the valve seat while bending the substantially arc-shaped spring portion. The valve is opened apart and the valve port is used as a passage for the inflow side chamber (outside chamber 6)
A bypass path is formed to allow the oil and the filtration chamber (the inner chamber 7) to communicate with each other, so that the supply and circulation of oil are performed properly and sufficiently. When the pressure difference is eliminated, the valve body closes. And the structure of the relief valve is simple, the bending allowance can be ensured by the substantially arcuate spring portion, and the necessary pressing force can be easily adjusted.

In the relief valve for a filtration device according to the present invention, it is preferable that the valve body is fixed to the valve seat by a rivet, because the manufacture is simple.

Further, by forming the valve body by punching and pressing a single plate body, the structure is simple and the production is easy, which is preferable.

Further, the valve seat is formed in a conical shape whose central portion protrudes, and the valve body is fixed to the central portion, so that a spring force is applied so that the valve body is seated on the valve seat, and the valve is provided. Preferably, the mouth is opened and closed. The structure is simple, and the valve pressure can be adjusted by setting the height of the conical shape.

[0012] A peripheral wall portion and a flange portion connected to the peripheral wall portion are provided around the conical shape of the valve seat, and the peripheral wall portion is connected to one end of a hollow cylindrical filtration element from one end of the filtration chamber. It is preferable that the valve seat is attached to the filtration element so as to enter the filter element. Thereby, the assemblability is further improved, and the positioning can be performed reliably.

[0013] Further, the flange portion of the valve seat also serves as an end plate for closing one end of the filter medium of the hollow cylindrical filter element, so that the end plate and the valve seat are made of the same part. Thus, the number of parts can be reduced.

[0014]

Embodiments of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view of an oil filter using a relief valve 21 according to the present invention, FIG. 2 is a valve body 27, (a) is a plan view, (b) is a sectional view taken along line bb, and FIG. 3 is a valve seat. It is a perspective view of 22.

The filter element 1 having a hollow cylindrical shape as a whole has a filter medium 2 formed by, for example, folding a filter paper and winding the filter medium 2 around the circumference thereof. The filter medium 2 is reinforced by a perforated cylinder 5 disposed in the cylindrical casing 11, and is accommodated in a cylindrical casing 11 having a top plate 12. An outer chamber 6 and an inner chamber 7 are formed in the casing 11 with the filter element 1 as a boundary.

An inflow hole 14 communicating with the outer chamber 6 is formed on the outer peripheral side of a socket plate 13 attached to the side of the casing 11 opposite to the top plate section 12, and an inner chamber is formed in the center of the socket plate 13. An outflow hole 15 is formed which communicates with the nozzle 7. At this outflow hole 15, a screw or the like is used to attach to an unillustrated bracket or the like. The oil flowing from the inflow hole 14 passes through the filter medium 2 from the outer chamber 6, is filtered into the inner chamber 7, and is discharged from the outflow hole 15 to the outside of the filter body. Reference numeral 16 denotes an anti-drain valve, and 17 denotes a gasket.

The relief valve 21 is provided for the filtration element 1.
Is provided at a substantially central position on the side of the top plate. An important feature of the relief valve 21 according to the present invention is that the relief valve 21 is fixed at a center portion to the valve seat 22 and has a substantially arc-shaped spring portion 25 from the center portion toward the outer peripheral side. A plate-shaped valve element 27 having a valve portion 26 for opening and closing a valve port 22a formed in the valve seat 22 at an outer peripheral portion connected thereto, and a valve port 22a formed around a central portion to which the valve element 27 is fixed. Valve seat 2
2).

In the illustrated example, the valve body 27 is attached to the valve seat 22.
The rivets 28 are used for fixing, but the fixing means is not particularly limited.

The valve body 27 is preferably formed by punching and pressing a single plate body, thereby simplifying the structure and facilitating manufacture. The valve body 27 is usually made of metal. FIG.
In the figure, reference numeral 28 indicates a punching portion. The valve body 27 has a substantially arcuate spring portion 25 extending from the center to the outer periphery.
have. The spring length necessary for opening and closing the valve can be obtained by this substantially arcuate spring portion 25. The spring pressure can be changed by setting the width, length, radius, etc. of the spring portion 25. A substantially ring-shaped outer peripheral portion connected to the spring portion 25 serves as a valve portion 26, and has a function of opening and closing a valve port 22a formed in the valve seat 22. The spring portions 25 are usually arranged at equal intervals. The number may be two or four or more.

Further, the valve seat 22 is formed in a conical shape with its central portion protruding, and the valve body 27 is fixed to the central portion, so that a spring force (so that the valve body 27 is seated on the valve seat 22). It is preferable that the valve port is opened and closed by applying an initial load for closing the valve. In this case, the bottom of the conical shape of the valve seat 22 may be horizontal, and the valve port 22a may be formed in the horizontal portion (see FIG. 3, in which FIG. 3 is drawn upside down in FIG. 1 for convenience). ). Reference numeral 22b indicates a conical slope.

As shown in the figure, a peripheral wall portion 23 and a flange portion 24 connected to the peripheral wall portion 23 are provided around the conical shape of the valve seat 22, and the peripheral wall portion 23 has a hollow cylindrical filtration element. Preferably, the valve seat 22 is mounted on the filter element 1 so as to enter the filtration chamber from one end of the filter element 1.

The valve seat 22 is normally fitted to the end plate 3 which closes one end of the filter medium of the filter element 1 at the peripheral wall portion 23 or the flange portion 24 connected to the peripheral wall portion 23.
It is attached using an appropriate fixing means such as adhesion. In addition,
By using a combustible material for the end plate 3 and attaching the valve seat 22 to the end plate 3 in a manner separable therefrom, disposal after use becomes easy.

The flange portion 23 of the valve seat 22 may also serve as the end plate 3 for closing one end of the filter medium of the hollow cylindrical filter element 1.

The relief valve 2 configured as described above
1 is that in a normal state, the valve portion 26 of the valve body 27 is seated on the valve seat 22 and the valve port 22a is closed by applying a spring force to the valve portion 26 by the spring portion 25, and The inner chamber 7 is isolated from the outer chamber 6 when the oil pressure increases as the engine speed increases, or when the filter medium becomes clogged with contaminants and the oil pressure increases. A large pressure difference is generated between the inner chamber 7 and the inner chamber 7, whereby the spring portion 25 is bent, the valve body 27 is separated from the valve seat 22, the valve is opened, and a bypass path is formed between the outer chamber 6 and the inner chamber 7. Supply and circulate oil properly and sufficiently. When the pressure difference is eliminated, the valve section 26 closes.

The embodiment of the present invention has been described above.
The present invention is not limited to those described above, and can be implemented with appropriate modifications and additions within the scope of the present invention.

[0026]

The relief valve according to the present invention uses the spring of the relief valve for the valve body by improving the valve structure as described above. Therefore, the structure is simple, the number of parts can be reduced, and the cost is low. It can be manufactured at low cost, can be moved smoothly and reliably, and has good assemblability. It is stable, can secure a sufficient flow rate, and can be reduced in weight.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil filter using a relief valve 21 according to the present invention.

2A is a plan view of the valve body 27, and FIG. 2B is a cross-sectional view taken along the line bb.

FIG. 3 is a perspective view of a valve seat 22.

FIG. 4 is a longitudinal sectional view illustrating a conventional oil filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration element 6 Outer chamber 7 Inner chamber 11 Casing 12 Top plate 21 Relief valve 22 Valve seat 22a Valve port 23 Peripheral wall part 24 Flange part 25 Spring part 26 Valve part 27 Valve element

Claims (6)

[Claims] 1. A filter provided on a wall between an inflow-side chamber and a filtration-side chamber separated by a filtration element housed in a casing, and opens when a pressure difference between the inflow-side chamber and the filtration chamber is equal to or higher than a predetermined pressure. In a relief valve for a filtration device, a valve seat is fixed at a center portion with respect to a valve seat, has a substantially arc-shaped spring portion from the center portion toward an outer peripheral side, and is an outer peripheral portion connected to the spring portion. 1. A relief valve for a filtration device, comprising: a plate-shaped valve body having a valve portion for opening and closing a valve port formed in a valve body; and a valve seat having a valve port formed around a central portion to which the valve body is fixed. 2. The relief valve according to claim 1, wherein the valve body is fixed to the valve seat by a rivet. 3. The relief valve according to claim 1, wherein the valve body is formed by punching and pressing a single plate body. 4. The valve seat is formed in a conical shape with its central portion protruding, and by fixing the valve body to the central portion, a spring force is applied so that the valve body is seated on the valve seat. 4. The relief valve for a filtration device according to claim 3, wherein the valve port is opened and closed. 5. A peripheral wall portion and a flange portion connected to the peripheral wall portion are provided on a conical outer periphery of the valve seat, and the peripheral wall portion extends from one end of a hollow cylindrical filtration element to a filtration chamber. The relief valve for a filtration device according to claim 4, wherein the valve seat is attached to the filtration element so as to enter the filtration element. 6. The relief valve according to claim 5, wherein the flange portion of the valve seat also serves as an end plate for closing one end of the filter medium of the hollow cylindrical filtration element.