JP2007291894A - Oil filter and pressure relief valve for oil filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure relief valve for an oil filter capable of collecting metal wear powder such as iron powder contained in oil at a time of valve open, reducing the number of components and assembly man-hours, and inhibiting drop of valve open set load. <P>SOLUTION: This pressure relief valve 10 is a valve opened by difference of pressure of oil between an upstream side and a downstream side of a filtering element 2 stored in a casing 3, is provided with a valve seat 11, a valve element 12 opening and closing an opening 15 formed on the valve seat, and a support body 13 supporting the valve element in such a manner that the valve element can displace. One of members of the valve element and the valve seat is made of magnet, another is made of magnetic body or magnet, and the support body is made of non-magnetic body. One of the members is opened by making the valve element attracted by the valve seat. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure relief valve for an oil filter and an oil filter including the same, and more specifically, can capture metal wear powder such as iron powder contained in oil when the valve is opened, and reduce the number of parts and assembly man-hours. In addition, the present invention relates to an oil filter pressure relief valve and an oil filter that can suppress the decrease in the set load for opening the valve.

2. Description of the Related Art Conventionally, an oil filter is generally known in which a pressure relief valve is provided so that an excessive pressure load is not applied to a filter element at the time of engine start and high speed operation. However, since the pressure relief valve escapes the pressure load by bypassing the contaminated oil to be filtered, the cleanliness of the oil may be impaired.
Therefore, as a conventional pressure relief valve that solves the above problem, a component that captures metal wear powder such as iron powder contained in oil by its magnetic force is known (for example, patent) Reference 1).

However, in the above-mentioned Patent Document 1, as shown in FIG. 8, the pressure relief valve 10A is composed of five parts: a valve body 12A, a coil spring 9A, a magnet member 8A, a housing 13A, and a valve seat 11A (end plate). As a result, the number of parts was large and the number of assembly steps was also large.
Moreover, in the said patent document 1, since the coil spring is employ | adopted as an urging | biasing means of a valve body, there exists a possibility that a set load of valve opening may fall by a long-term repeated operation | movement of the coil spring, and a set load of valve opening may fall. There is.

Japanese Utility Model Publication No. 63-173317

  The present invention has been made in view of the above situation, and can capture metal wear powder such as iron powder contained in oil when the valve is opened, and can reduce the number of parts and assembly man-hours. An object of the present invention is to provide an oil filter pressure relief valve and an oil filter that can suppress a decrease in the set load of the valve.

The present invention is as follows.
1. In a pressure relief valve for an oil filter that opens due to a pressure difference between oil on the upstream side and downstream side of the filtration element accommodated in the casing,
A valve body; a valve body that opens and closes an opening formed in the valve seat; and a support body that displaceably supports the valve body, and one member of the valve body and the valve seat is a magnet. And the other member is made of a magnetic body or a magnet, the support body is made of a non-magnetic body, and the valve body is attracted to the valve seat by the magnetic force of the one member to close the valve. Features a pressure relief valve for oil filters.
2. 1. The valve body is a magnet. Pressure relief valve for oil filter as described.
3. The said support body has the cylinder wall part which guides the outer peripheral part of the said valve body, and the control part which controls the movement amount to the valve opening direction of this valve body. Or 2. An oil filter pressure relief valve as described in 1.
4). 2. An oil passage through which oil passes when the valve is opened is formed in at least one of the outer peripheral portion of the valve body and the cylindrical wall portion of the support body. Pressure relief valve for oil filter as described.
5). 2. The filter element is supported by inserting a center hole of the filter element into the outer peripheral surface of the cylindrical wall portion of the support body. Or 4. An oil filter pressure relief valve as described in 1.
6). One of the valve body and the valve seat is provided with a seal portion made of a non-magnetic material that comes into contact with the other member. To 5. The pressure relief valve for oil filters according to any one of the above.
7). A casing for housing the filter element; and 1. the casing disposed so as to isolate an upstream side and a downstream side of the filter element in the casing. To 6. An oil filter comprising: the pressure relief valve according to any one of the above.

According to the pressure relief valve for an oil filter of the present invention, since one member of the valve body and the valve seat is made of a magnet, the valve body is attracted to the valve seat and closed by the magnetic force of the one member. The On the other hand, the valve element is opened away from the valve seat against the magnetic force of one member due to the pressure difference between the upstream and downstream oil of the filter element. When the valve is opened, metal wear powder such as iron powder contained in the bypassed oil is captured by the magnetic force of one member. As described above, since the magnetic force of one member exerts the function of attracting the valve body to the valve seat and the function of capturing the metal wear powder, the spring member for biasing the valve body as in the past. The number of parts and the number of assembling steps can be reduced as compared with those each including a magnet member for capturing metal wear powder. Moreover, since the spring member is not used, it is possible to suppress a decrease in the set valve opening load even by a long-term repeated operation.
Further, when the valve body is made of a magnet, the oil before filtration flows in the vicinity of the valve body when the valve is opened, so that the metal abrasion powder in the oil can be more reliably captured by the magnetic force of the valve body.
Further, when the support has a cylindrical wall portion and a restricting portion, the outer peripheral portion of the valve body is guided by the cylindrical wall portion, and the valve body is displaced more smoothly. The amount of movement in the valve opening direction is regulated.
Further, when an oil passage is formed in at least one of the outer peripheral portion of the valve body and the cylindrical wall portion of the support body, the support body and the valve are secured while ensuring oil permeability at the time of valve opening. The gap between the bodies can be minimized. As a result, the valve body can be moved more smoothly.
Further, when the center hole of the filtration element is inserted into the outer peripheral surface of the cylindrical wall portion of the support and the filtration element is supported, the support supports the valve body and the filtration element. And the number of parts can be further reduced.
In addition, when one of the valve body and the valve seat is provided with a seal portion made of a nonmagnetic material that comes into contact with the other member, metal wear powder is deposited on the seal portion made of the nonmagnetic material. It is difficult to adhere, and the occurrence of malfunction due to the biting of metal wear powder on the seal surface can be suppressed.

  According to the oil filter of the present invention, since one member of the valve body and the valve seat constituting the pressure relief valve is made of a magnet, the valve body is attracted to the valve seat by the magnetic force of the one member and is closed. To be spoken. On the other hand, the valve element is opened away from the valve seat against the magnetic force of one member due to the pressure difference between the upstream and downstream oil of the filter element. When the valve is opened, metal wear powder such as iron powder contained in the bypassed oil is captured by the magnetic force of one member. As described above, since the magnetic force of one member exerts the function of attracting the valve body to the valve seat and the function of capturing the metal wear powder, the spring member for biasing the valve body as in the past. The number of parts and the number of assembling steps can be reduced as compared with those each including a magnet member for capturing metal wear powder. Moreover, since the spring member is not used, it is possible to suppress a decrease in the set valve opening load even by a long-term repeated operation.

1. Pressure Relief Valve The pressure relief valve according to the present embodiment is for an oil filter that opens when the pressure difference between the upstream side (before filtration) and the downstream side (after filtration) of the filtration element becomes greater than a predetermined value. belongs to. This pressure relief valve includes a valve seat, a valve body, and a support body described below.
The structure, shape, material, etc. of the “filtration element” are not particularly limited. This filter element can be formed, for example, by folding a filter medium such as a nonwoven fabric, a woven fabric, or filter paper into a chrysanthemum shape.

The “valve seat” is not particularly limited in structure, shape, or the like as long as an opening that communicates the upstream side and the downstream side of the filtration element is formed. The valve seat is made of a magnetic material (for example, an iron-based metal, an iron-based alloy, etc.) or a permanent magnet.
Examples of the shape of the seat surface of the valve seat include a convex shape and a planar shape.
For example, a seal portion made of a non-magnetic material can be provided on the seat surface of the valve seat. The seal portion can be made of an elastic body such as synthetic resin, rubber, or elastomer.
The valve seat can be fixed to the support body by adhesion or the like, for example, but from the viewpoint of assembly, the valve seat may be sandwiched between the bottom of the casing and the support body. preferable.

The “valve body” is not particularly limited in structure, shape, or the like as long as the opening of the valve seat can be opened and closed. The valve body is made of a permanent magnet or a magnetic body (for example, an iron-based metal, an iron-based alloy, etc.).
Examples of the shape of the valve surface of the valve body include a convex shape and a planar shape.
For example, a seal portion made of a non-magnetic material can be provided on the valve surface of the valve body. The seal portion can be made of an elastic body such as synthetic resin, rubber, or elastomer.

The “support” is not particularly limited in its structure, shape, and the like as long as it supports the valve body so as to be displaceable. This support is made of a non-magnetic material (for example, synthetic resin, aluminum, etc.).
The said support body is formed in a cylinder shape, for example, and can have the cylinder wall part which guides the outer peripheral part of a valve body, and the control part which controls the moving amount | distance to the valve opening direction of a valve body. In this case, an annular gap for oil passage can be set between the outer peripheral surface of the valve body and the inner peripheral surface of the cylindrical wall portion of the support body. It is preferable that an oil passage (for example, a groove, a hole, etc.) for oil passage is formed in at least one portion of the portion. The shape, size, number, etc. of the oil passage are not particularly limited.
For example, a central hole of the filtration element is inserted into the outer peripheral surface of the cylindrical wall portion of the support so that the filtration element can be supported. In this case, many communication holes are usually formed in the cylindrical wall portion of the support.

Here, as the material of the valve body and the valve seat, for example, (1) a form in which the valve body is made of a permanent magnet and the valve seat is made of a magnetic body, and (2) a form in which the valve body and the valve seat are made of a permanent magnet. (3) The valve body is made of a magnetic material and the valve seat is made of a permanent magnet.
In the above-mentioned forms (1) to (3), the valve body is adsorbed to the valve seat by the magnetic force of the valve body and / or the valve seat and closed, while the oil pressure on the upstream side and downstream side of the filter element is closed. When the difference becomes larger than a predetermined value, the valve body is separated from the valve seat and opens by the pressure difference against the magnetic force of the valve body and / or the valve seat.
Here, from the viewpoint that the metal wear powder in the oil bypassed when the valve is opened can be more reliably captured, it is preferable to have the above-mentioned forms (1) and (3).

2. Oil Filter The oil filter according to the present embodiment includes a casing and a pressure relief valve described below.

As long as the “casing” accommodates the filter element, its structure, shape and the like are not particularly limited.
Examples of the casing include (1) a bottomed cylindrical case, and an end plate attached to the open end of the case and having an oil inlet and an oil outlet formed therein. ) A cylindrical case with a bottom in which an oil inlet and an oil outlet are formed, and a cap that is coupled to the case by relative rotation around an axis through coupling means (for example, a threaded portion, a bayonet portion, etc.) And the like.
In the above (2) mode, for example, the above-described pressure relief valve is integrally provided in the cap, so that it can be used as a type in which only the filtration element is replaced.

  Embodiment 1 The pressure relief valve is disposed in the casing so as to isolate the upstream side and the downstream side of the filter element. This is the pressure relief valve described in.

Hereinafter, the present invention will be specifically described with reference to the drawings.
In the present embodiment, an “oil filter” according to the present invention is exemplified by an oil filter that filters lubricating oil of an internal combustion engine.

(1) Configuration of Oil Filter As shown in FIG. 1, the oil filter 1 according to the present embodiment includes a casing 3 that houses the filtration element 2 and a pressure relief valve that will be described later.
The casing 3 includes a bottomed cylindrical case 3a having an opening at the bottom, and an end plate 3b attached to the open end side of the case 3a. An oil outlet 4 is formed at the center of the end plate 3b. A plurality of oil inlets 5 are formed around the oil outlet 4 of the end plate 3b. A rubber check valve 6 is mounted on the end plate 3b.

  The filter element 2 is formed by folding filter paper into a chrysanthemum shape. A sealing layer 7 made of an elastic material (for example, synthetic resin, rubber, etc.) is provided on the upper end surface side and the lower end surface side of the filter element 2 so as to be pressed against the outer peripheral surface of a support described later and sealed in a liquid-tight manner. ing.

(2) Configuration of Pressure Relief Valve Next, the configuration of the pressure relief valve 10 according to this embodiment will be described.
As shown in FIG. 2, the pressure relief valve 10 is disposed in the casing 3 so as to isolate the upstream side (before filtration) and the downstream side (after filtration) of the filtration element 2. The pressure relief valve 10 includes a valve seat 11, a valve body 12, and a support body 13.

  The valve seat 11 is formed by processing an iron plate (magnetic material). The valve seat 11 includes a flat valve seat portion 11a and a leg portion 11b extending obliquely upward from the peripheral side of the valve seat portion 11a. In addition, an opening 15 that communicates the upstream side and the downstream side of the filtration element 2 is formed in the central portion of the valve seat 11. The seat surface 16 of the valve seat 11 is formed in a convex shape that protrudes downward. Further, the valve seat 11 is sandwiched between the case 3a and the support 13 in a state where the tip of the leg 11b is in contact with the bottom of the case 3a and the valve seat 11a is in contact with the shaft end of the support 13. Has been.

  The valve body 12 is made of a permanent magnet. The valve body 12 is formed in a disc shape capable of closing the opening 15 of the valve seat 11. Further, the magnetic force of the valve body 12 is adjusted so that the set load for opening the pressure relief valve 10 becomes a predetermined value (for example, 10 to 30 N).

  The support 13 is made of a synthetic resin (non-magnetic material) and is formed in a cylindrical shape. The support 13 has a cylindrical wall portion 13a that guides the outer peripheral portion of the valve body 12 and into which the filtration element 2 is inserted and supported. On the inner peripheral side of the cylindrical wall portion 13a, a ring-shaped restricting portion 13b that restricts the amount of movement of the valve body 12 in the valve opening direction and prevents the valve body 12 from dropping off is provided. An annular clearance S for oil passage is set between the inner peripheral surface of the cylindrical wall portion 13 a of the support 13 and the outer peripheral surface of the valve body 12.

(3) Operation of Oil Filter Next, the operation of the oil filter 1 will be described.
In the oil filter 1, as shown in FIG. 1, the oil that has flowed into the upstream chamber 25 through the oil inlet 5 passes through the filter element 2 to remove foreign matters such as dust mixed in the oil. . The filtered oil is returned from the downstream chamber 26 to the external engine lubrication system circuit via the oil outlet 4.

  In the pressure relief valve 10, when the pressure difference between the upstream side and the downstream side of the filtration element 2 is smaller than a predetermined value, the valve body 12 is attracted to the valve seat 11 by the magnetic force of the valve body 12, as shown in FIG. Closed. On the other hand, when the pressure difference between the upstream side and the downstream side of the filter element 2 becomes larger than a predetermined value at the time of engine start or high speed operation, the pressure difference resists the magnetic force of the valve body 12 as shown in FIG. Thus, the valve body 12 is opened away from the valve seat 11. Then, the oil before filtration flows out from the oil outlet 4 through the gap S between the valve body 12 and the support body 13 through the opening 15 of the valve seat 11. At this time, the metal abrasion powder in the oil flowing in the vicinity of the valve body 12 is captured by the magnetic force of the valve body 12. When the valve is closed, the valve seat 11 is magnetized by the magnetic force of the valve body 12, so that the metal wear powder in the oil flowing in the vicinity of the valve seat 11 is captured by the valve seat 11.

(4) Effects of the embodiment In the pressure relief valve 10 of this embodiment, the valve body 12 is attracted to the valve seat 11 made of a magnetic material and closed by the magnetic force of the valve body 12 made of a permanent magnet. The valve element 12 is configured to be opened away from the valve seat 11 against the magnetic force of the valve element 12 due to the pressure difference between the upstream side and the downstream side of the element. Metal wear powder in the flowing oil before filtration can be more reliably captured by the magnetic force of the valve body 12. Further, as compared with the conventional technique (see FIG. 8) that uses a spring member (coil spring) for urging the valve body 12, the set load of the valve opening is reduced even by repeated operation over a long period of time. Is suppressed. Furthermore, the response speed of the valve body 12 at the time of valve closing and valve opening increases, and damage to the filter element 2 and unnecessary bypass of oil before filtration can be suppressed.

  In the present embodiment, the magnetic force of the valve body 12 exerts the suction function of the valve body 12 with respect to the valve seat 11 and the capture function of metal wear powder, and the support body 13 supports the filtering function of the valve body 12 and the filtration. Since the support function of the element 2 is exhibited, the pressure relief valve 10 can be configured by three parts, that is, the valve seat 11, the valve body 12, and the support body 13. Accordingly, as in the prior art (see FIG. 8), the valve body 12A, the coil spring 9A, the magnet member 8A, the housing 13A, and the valve seat 11A are used, and the inner part for supporting the filter element 2 is used. Compared to a pressure relief valve further including a cylindrical member, the number of parts can be reduced by three points, and the number of assembly steps can be greatly reduced.

  Furthermore, in the present embodiment, the valve seat 11 is sandwiched between the case 3a and the support body 13, so that it is not necessary to fix the valve seat 11 to the support body 13 and the assembly can be further improved. . On the other hand, in the conventional technique (see FIG. 8), the valve body 12A is biased toward the valve seat 11A by the coil spring 9A, so that the valve seat 11A and the housing 13A (support) are fixed. It is necessary and the assemblability is low.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above embodiment, the valve body 12 is brought into direct contact with the seat surface 16 of the valve seat 11 to close the valve. However, the present invention is not limited to this. For example, as shown in FIGS. A plate-like seal portion 18 or a ring-like seal portion 19 made of a non-magnetic material such as a synthetic resin is bonded to the surface of the body 12, and the seal portions 18 and 19 are brought into contact with the seat surface 16 of the valve seat 11. May be closed. Thereby, in addition to substantially the same operation and effect as in the above embodiment, the metal wear powder is difficult to adhere to the seal portions 18 and 19 made of a non-magnetic material, so that it is possible to suppress malfunction caused by biting it. . As shown in FIG. 5, when the ring-shaped seal portion 19 is employed, the amount of seal material used can be reduced, and the seat surface 16 of the valve seat 11 can be formed in a simple flat shape.

  Moreover, in the said Example, although the clearance gap S for oil passage was set between the valve body 12 and the support body 13, it is not limited to this, For example, as shown in FIG.4 and FIG.5, valve | bulb A plurality of oil passages 20 (for example, grooves, holes, etc.) may be provided on the outer periphery of the body 12. Thereby, in addition to substantially the same operation and effect as in the above embodiment, the gap (backlash) between the valve body 12 and the support body 13 can be minimized while ensuring oil permeability during valve opening. The valve body 12 can be moved more smoothly.

Moreover, in the said Example, although the valve body 12 was supported so that displacement was possible in the cylindrical support body 13 which supports a filtration element, it is not limited to this, For example, as shown in FIG. You may make it provide the 1st support body 21 which supports the filter element 2, and the 2nd support body 22 which is a member different from this 1st support body 21, and supports the valve body 12. FIG. Further, the support body 13 of the above embodiment may have a double cylinder structure, and the filter element may be supported by the outer cylinder and the valve element may be supported by the inner cylinder so as to be displaceable.
Furthermore, in the said Example, although the valve body 12 was supported so that displacement was possible within the cylindrical support body 13, it is not limited to this, For example, as shown in FIG. The ring-shaped valve body 12 may be slidably supported.

  It is widely used as a technique for filtering oil. In particular, it is suitably used as an oil filter for an internal combustion engine and a pressure relief valve used therefor.

It is the one-side longitudinal cross-sectional view of the oil filter which concerns on a present Example. It is a principal part enlarged view of FIG. It is explanatory drawing for demonstrating the valve opening operation | movement of the pressure relief valve which concerns on a present Example. It is explanatory drawing for demonstrating the other form of a pressure relief valve. It is explanatory drawing for demonstrating the further another form of a pressure relief valve. It is explanatory drawing for demonstrating the further another form of a pressure relief valve. It is explanatory drawing for demonstrating the further another form of a pressure relief valve. It is a longitudinal cross-sectional view which shows the conventional pressure relief valve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Oil filter, 2; Filtration element, 3; Casing, 10: Pressure relief valve, 11: Valve seat, 12; Valve body, 13, 23; Support body, 13a; Cylindrical wall part, 13b; Openings, 18, 19; seal part, 20; oil passage.

Claims (7)

In a pressure relief valve for an oil filter that opens due to a pressure difference between oil on the upstream side and downstream side of the filtration element accommodated in the casing,
A valve body; a valve body that opens and closes an opening formed in the valve seat; and a support body that displaceably supports the valve body, and one member of the valve body and the valve seat is a magnet. And the other member is made of a magnetic body or a magnet, the support body is made of a non-magnetic body, and the valve body is attracted to the valve seat by the magnetic force of the one member to close the valve. Features a pressure relief valve for oil filters.   The pressure relief valve for an oil filter according to claim 1, wherein the valve body is made of a magnet.   3. The oil filter according to claim 1, wherein the support body includes a cylindrical wall portion that guides an outer peripheral portion of the valve body, and a restriction portion that restricts a movement amount of the valve body in a valve opening direction. Pressure relief valve.   The pressure relief valve for an oil filter according to claim 3, wherein an oil passage through which oil passes when the valve is opened is formed in at least one of the outer peripheral portion of the valve body and the cylindrical wall portion of the support body.   The pressure relief valve for an oil filter according to claim 3 or 4, wherein a central hole of the filtration element is inserted into an outer peripheral surface of the cylindrical wall portion of the support body to support the filtration element.   6. The oil filter according to claim 1, wherein one member of the valve body and the valve seat is provided with a seal portion made of a nonmagnetic material that contacts the other member. Pressure relief valve.   A casing that houses the filtration element, and a pressure relief valve according to any one of claims 1 to 6 disposed so as to isolate the upstream side and the downstream side of the filtration element in the casing. An oil filter characterized by that.

Images