JP2000157805A - Oil filter and valve disc used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain certain sealability by the contact of a valve disc with a valve seat part while ensuring the filtering area of a filter element without complicating a structure. SOLUTION: When the pressure of the oil flowing in from the oil inlet 25 of the case 20 of an oil filter 100 becomes predetermined pressure or more, the valve disc part of a relieve valve 50 is operated and the oil is permitted to pass without being passed through a filter element to be allowed to escape to an oil outlet 26. The relief valve 50 is arranged by utilizing the space in the filter element 31 and the filtering area of the filter element 31 can be ensured without increasing the vol. of the oil filter 10. Since the relief valve 50 is set to a line seal state by the planar line contact of the valve disc part thereof with the opposed valve seat part 35d, certain sealability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil filter for filtering foreign matters and the like mixed in oil and a valve element used for the same.

[0002]

2. Description of the Related Art Conventionally, as prior art documents relating to an oil filter and a valve element used therein, those disclosed in Japanese Utility Model Registration No. 2505768 and Japanese Utility Model Laid-Open No. 7-141010 are known. In these things,
Activates when the filter element contained in the oil filter is deteriorated due to clogging, etc., or when the viscosity of the oil becomes low at low temperatures and the oil cannot pass through the filter element. In the valve element (relief valve: pressure relief valve) for allowing the oil to escape to the oil outlet side without passing through, a technique for securing an arrangement place where the filtration area of the filter element can be effectively used and simplifying the structure has been disclosed. I have.

[0003]

By the way, in the above-mentioned structure, a valve element is provided inside the filter element, and the valve element and the valve seat are both formed of a curved surface. That is, since the valve element and the valve seat are in a sealed state using a curved surface, there is a problem that it is difficult to obtain a reliable sealing property only by the contact therebetween.

Accordingly, the present invention has been made to solve such a problem, and a reliable seal is ensured by contact between a valve element and a valve seat while securing a filtration area of a filter element without complicating the structure. It is an object of the present invention to provide an oil filter capable of obtaining a property and a valve element used therefor.

[0005]

According to the first aspect of the present invention, a valve element is provided inside a filter element housed in a casing having an oil inlet and an oil outlet on a bottom surface. Then, when the pressure of the oil flowing from the oil inlet side becomes equal to or higher than a predetermined pressure, the movable valve portion of the valve body is actuated to allow the oil to pass therethrough without passing through the filter element and to escape to the oil outlet side. The movable valve portion of the valve body faces the valve seat portion on the casing side and is in a line sealing state by planar line contact. That is, in the oil filter, the valve element is disposed using the space inside the filter element, and the filtration area of the filter element can be secured without increasing the volume of the oil filter. Further, since the oil filter is in a line sealing state by planar line contact between the movable valve portion of the valve body and the valve seat portion on the casing side, it is possible to obtain a reliable sealing property.

According to the oil filter of the second aspect, the valve seat portion and the oil passage for forming the valve body are formed by using the separating member for separating the dirty oil side and the purified oil side of the filter element. I have. This simplifies the configuration for obtaining an isolated state between the dirty oil side and the purified oil side of the filter element, and does not increase the number of parts for securing an oil passage due to deterioration of the filter element and the like. .

In the oil filter according to the third aspect, the valve body is assembled and fixed to the separating member at the holding portion. As described above, the valve element fixed and integrated on the isolation member side is easy to handle, and high reliability as the valve element can be obtained.

In the oil filter according to the fourth aspect, the separating member is fixed to the casing side mounted on the internal combustion engine side, so that, for example, when the casing is divided by exchanging elements, components other than the filter element are disposed on the internal combustion engine side. The element is easily fixed because it is fixed to the casing.

According to a fifth aspect of the present invention, the movable valve portion is disposed inside the filter element within the casing, and operates when the pressure of the oil flowing from the oil inlet side exceeds a predetermined pressure. The oil is allowed to pass through without passing through the filter element, and is allowed to escape to the oil outlet side. The movable valve portion of the valve body is urged by a spring portion to face the valve seat portion on the casing side and is in a line sealed state by planar line contact. That is, the valve element for the oil filter is disposed by utilizing the space inside the filter element, and the filtration area of the filter element can be secured without increasing the volume of the oil filter.
Further, since the movable valve portion of the valve body and the valve seat portion on the casing side are in a line-sealed state by planar line contact, a reliable sealing property can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples.

FIG. 1 is a sectional view showing an oil filter and an element exchange type spin-on oil filter to which a valve element used in the oil filter according to one embodiment of the present invention is applied, and FIG. 2 is a bottom view of FIG. It is.

1 and 2, reference numeral 100 denotes an element-exchange type spin-on oil filter (hereinafter, simply referred to as an "oil filter"). The oil filter 100 has a bottomed substantially cylindrical cap 10 made of aluminum or the like.
The casing 10 is composed of the casing 10 and the cap 20. The cap 10 and the casing 20 are liquid-tightly coupled via a gasket 14 and integrated. The cap 10 is provided with a filter mounting / removing rib 11 on its substantially cylindrical outer peripheral surface, and a plurality of grooves 12 on its outer peripheral surface near its opening. The case 20 has a projection 21 connected to the groove 12 of the cap 10 on the inner surface of the cylinder in the vicinity of the opening, an oil inlet 25 on the inner periphery, and an oil outlet 26 at the center, which also serves as a female screw for fixing the filter. Is provided. As described above, the cap 10 and the case 20 in the present embodiment are connected using a so-called bayonet method using the groove 12 and the protrusion 21.

In the oil filter 100, a birdcage-like protector member 32 made of plastic resin has two holding portions 32a having downward insertion holes, and the holding portions 32a are press-fitted and fixed to the case 20 side. The projection 35a formed on the relief valve housing 35 is snap-coupled and integrated. Around the outer periphery of the protector member 32, the filter element 31 having fibers formed by well-known suction molding and having a function of trapping foreign matter and the like is provided.
Is covered. When the filter element 31 is put on the outer periphery of the protector member 32, it is pressed against the protector member 32 and the relief valve housing 35 side. As a result, the lower end surface of the filter element 31 is deformed so as to follow the convex sealing projection 35b formed in the relief valve housing 35 and having a triangular cross section.

A drain hole 13 is formed at the center of the top of the cap 10, and the drain hole 13 has an O.
It is held in a liquid-tight manner by a drain member 15 having a ring 16. In the assembled state of the oil filter 100, the drain member 15 attaches the filter element 31 to the protector member 32 and the relief valve housing 35 via a spring member 17 disposed between the inner surface of the top of the cap 10 and the drain member 15. I'm going. This allows
The positioning and fixing of the filter element 31 and the sealing state inside and outside thereof are ensured. The case 20 is fixed to a mounting seat (not shown) of the cylinder block of the internal combustion engine by screwing the oil outlet 26 of the case 20 into a male screw portion on the cylinder block (not shown) side of the internal combustion engine. A rubber gasket 29 is fitted around the outer periphery of the end surface on the case 20 side, and the space between the gasket 29 and the mounting seat of the internal combustion engine is kept liquid-tight.

Next, the detailed structure of the anti-drain valve (check valve) 40 inserted inside the oil inlet 25 of the case 20 will be described with reference to an enlarged sectional view shown in FIG.

The anti-drain valve 40 has a valve body 41 inserted into an anti-drain valve housing 42 and a conical spring member 43 assembled with an urging force therebetween. The stored oil is prevented from returning to the oil inlet 25 side.

Further, a relief valve housing 35 which is opened inside the protector member 32 separately from the oil flow path to the filter element 31 side in the oil filter 100.
The detailed structure of the relief valve (relief valve) 50 disposed at the downstream open end of the oil passage 35c will be described with reference to the enlarged view of FIG. FIG.
(A) is a relief valve 50 viewed from the same direction as FIG.
FIG. 4B is a front view of FIG. 4A viewed from the left side.

In FIG. 4, a relief valve 50 includes a valve body 51, a leaf spring 52 following the valve body 51, and a clip-shaped fixing portion 5.
The relief valve housing 35 is sandwiched and fixed to an extended end 35e formed near the valve seat 35d at the open end of the oil passage 35c using the clip-shaped fixing portion 53. Then, the urging force of the leaf spring portion 52 of the relief valve 50 brings the valve body portion 51 and the valve seat portion 35d of the relief valve housing 35 into a line sealing state by planar line contact, and the relief valve housing 3
5 through the oil passage 35c of the filter element 31
Inside and outside are securely isolated and held.

Next, the operation of the relief valve 50 when the oil filter 100 mounted on a cylinder block (not shown) of the internal combustion engine is in use will be described with reference to FIGS.
This will be described with reference to FIG.

In FIGS. 1 and 4, when the filter element 31 accommodated in the oil filter 100 has a sufficient filtering ability while the internal combustion engine is in operation, the contaminated oil sent from the internal combustion engine side is supplied to the oil inlet of the case 20. 25
From the oil filter 1 through the anti-drain valve 40
An oil flow path leading to the inside of 00 is formed. That is, when the outer peripheral edge of the valve body portion 41 of the anti-drain valve 40 abutting on the upper surface of the anti-drain valve housing 42 reaches a predetermined value or more when the differential pressure of the contaminated oil from the internal combustion engine side becomes a predetermined value or more.
The oil passage is formed by overcoming the biasing force of No. 3 and being pushed inward.

The dirty oil that has reached the inside of the oil filter 100 is purified by the filtering action of the filter element 31 and passes through a plurality of openings formed in the substantially cylindrical side peripheral surface of the birdcage-like protector member 32. It flows into the inside and returns to the internal combustion engine through the central opening of the relief valve housing 35 and the oil outlet 26 of the case 20. At this time, the valve body 51 of the relief valve 50
Is not moved by overcoming the biasing force of the leaf spring portion 52. The valve body 41 of the anti-drain valve 40
When the pressure difference before and after the dirty oil from the internal combustion engine becomes an engine stop state or the like at a predetermined value or less, the case 2
The oil flow path is shut off by returning to the anti-drain valve housing 42 side which is inserted into the housing.

Next, when the filter element 31 accommodated in the oil filter 100 becomes clogged or the like and its filtering ability is extremely reduced and the pressure of the contaminated oil delivered from the internal combustion engine rises to a predetermined value or more, the contaminated oil Passes through an oil passage 35c provided in the relief valve housing 35, and the valve body 51 of the relief valve 50 is
2 and is pushed up by overcoming the urging force, and flows into the protector member 32 to form an oil flow path returning to the internal combustion engine through the central opening of the relief valve housing 35 and the oil outlet 26 of the case 20. That is, the relief valve 5
0 changes from the previous closed state to the open state, and the circulation of the oil to the internal combustion engine side is continued. Needless to say, since the filtering action by the filter element 31 does not work on the contaminated oil at this time, the contaminated oil is returned to the internal combustion engine side while being contaminated.

Here, the oil filter 100 of this embodiment is
Is used to replace the filter element 31
The filtration ability can be restored by exchanging only one. In addition, the oil filter 100 of the present embodiment
1 is mounted on the internal combustion engine with the top and bottom inverted, and in element replacement, the cap 10 is slightly loosened with respect to the case 20 still mounted on the internal combustion engine to operate the drain member 15. Thus, the dirty oil in the oil filter 100 can be discharged from the drain hole 13 of the cap 10 in advance.

As described above, the oil filter 1 of this embodiment
Reference numeral 00 denotes a casing including a substantially cylindrical filter element 31 for filtering oil, a cap 10 and a case 20 having an oil inlet 25 and an oil outlet 26 on the bottom surface thereof, and a filter element 3 in the casing.
And a relief valve 50 disposed inside the oil inlet 1 to allow oil flowing in from the oil inlet 25 side to escape to the oil outlet 26 side without passing through the filter element 31. Is a predetermined pressure or more, the valve body 51 as a movable valve that allows oil to pass from the oil inlet 25 side to the oil outlet 26 side
The valve body portion 51 and the valve seat portion 35d on the casing side facing the valve body portion 51 are brought into a line sealing state by planar line contact.

That is, in the oil filter 100, a relief valve 50 is provided inside a filter element 31 housed in a casing comprising the cap 10 and the case 20 having an oil inlet 25 and an oil outlet 26 on the bottom surface. Then, when the pressure of the oil flowing from the oil inlet 25 side of the case 20 becomes equal to or higher than a predetermined pressure, the valve body 51 of the relief valve 50 is operated to allow the oil to pass without passing through the filter element 31 and the oil outlet 26
Escaped to the side. The valve body 51 of the relief valve 50
Is in a line sealing state by planar line contact facing the valve seat 35d on the casing side. That is, since the relief valve 50 is provided by utilizing the space inside the filter element 31, the filtration area of the filter element 31 can be secured without increasing the volume of the oil filter 100. Further, since the relief valve 50 of the oil filter 100 has the valve body portion 51 and the valve seat portion 35d on the casing side in a line sealing state, it is possible to obtain a reliable sealing property.

The oil filter 100 of this embodiment
Further includes a relief valve housing 35 as an isolation member for isolating the dirty oil side and the purified oil side of the filter element 31 from each other.
Is formed with a valve seat 35d, and an oil passage 35c communicating between the dirty oil side and the purified oil side. That is, the relief valve housing 3 that separates the dirty oil side and the purified oil side of the filter element 31 from each other.
A valve seat 35d and an oil passage 35c for forming the relief valve 50 by using the nozzle 5 are formed. This simplifies the configuration for obtaining an isolated state between the dirty oil side and the purified oil side of the filter element 31, and increases the number of parts for securing an oil passage due to deterioration of the filter element 31, etc. Nor.

The oil filter 100 of the present embodiment
The relief valve 50 has a valve body 51 as a movable valve section.
, Leaf spring portion 52 and clip-shaped fixing portion 53 as a holding portion
And is fixed to the relief valve housing 35 side as an isolation member by a clip-shaped fixing portion 53. That is, the relief valve 50 is assembled and fixed to the relief valve housing 35 side by the clip-shaped fixing portion 53. Thus, the relief valve housing 35
The relief valve 50 fixed and integrated on the side is easy to handle, and high reliability as the relief valve 50 can be obtained.

Further, a relief valve housing 35 as an isolation member of the oil filter 100 of the present embodiment is press-fitted and fixed to the case 20 side of the casing including the cap 10 and the case 20. That is, by fixing to the case 20 side mounted on the internal combustion engine side, when the cap 10 is removed from the case 20, the components other than the filter element 31 remain fixed to the case 20 (internal combustion engine side). Therefore, element replacement becomes easy.

The relief valve 50 for the oil filter 100 of the present embodiment accommodates a substantially cylindrical filter element 31 for filtering oil, the cap 10 having an oil inlet 25 and an oil outlet 26 on its bottom surface, and a case. Filter element 31 in a casing consisting of
The oil flowing from the oil inlet 25 side is disposed inside the oil outlet 2 without passing through the filter element 31.
A valve body portion 51 serving as a movable valve portion that allows oil to pass from the oil inlet 25 side to the oil outlet 26 side when the oil pressure at the oil inlet 25 becomes equal to or higher than a predetermined pressure. The valve body portion 51 is provided with a valve seat portion 35d of the relief valve housing 35 on the casing side opposed thereto.
Spring portion 52 biasing the valve body portion 51 and the leaf spring portion 5
And a clip-shaped fixing portion 53 as a holding portion for fixing the valve body 51 to the extended end portion 35e of the relief valve housing 35, and the valve body portion 51 and the valve seat portion 35d are line-sealed by planar line contact. Is what you do.

That is, the relief valve 50 for the oil filter 100 disposed inside the filter element 31 in the casing including the cap 10 and the case 20.
When the pressure of the oil flowing from the oil inlet 25 becomes equal to or higher than a predetermined pressure, the valve body 51 is actuated to allow the oil to pass without passing through the filter element 31 and escape to the oil outlet 26. The valve body 51 of the relief valve 50 is urged by the leaf spring 52 so as to face the valve seat 35d of the relief valve housing 35 on the casing side, and is in a line sealing state by planar line contact. That is, the relief valve 50 for the oil filter 100 is disposed by utilizing the space inside the filter element 31, and the filtration area of the filter element 31 can be secured without increasing the volume of the oil filter 100. . The relief valve 50 for the oil filter 100 has a valve body 51 and a relief valve housing 3.
5 and the valve seat 35d are in a line-sealed state.
Reliable sealing performance can be obtained.

In the above-described embodiment, the valve body 51, the leaf spring 52, and the clip-shaped fixing portion 53 constituting the relief valve 50 are integrally formed by stamping from a single plate material. The present invention is not limited to this, and may be formed separately and combined. In addition, since it is configured like the relief valve 50 of the present embodiment, the number of parts is reduced and the cost is reduced.

In the above embodiment, the relief valve 5
As shown in FIG. 4, the 0 valve body 51 uses a convex shape formed of a hemispherical surface to secure the sealing property with the valve seat 35d of the relief valve housing 35, but the present invention is implemented. In this case, the present invention is not limited to this. As shown in FIG. 5 as a modified relief valve 60, a valve body 6 integral with a leaf spring portion 62 and a clip-shaped fixing portion 63 is provided.
1 may have a convex shape in which the protruding surface is a flat surface. In this case, it is preferable that the valve seat portion facing the valve body portion 61 of the relief valve 60 has a convex shape having an annular and semicircular cross section.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an oil filter and an element exchange type spin-on oil filter to which a valve element used for the oil filter according to one embodiment of the present invention is applied.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an enlarged sectional view showing a detailed structure of an anti-drain valve in the oil filter of FIG.

FIG. 4 is an enlarged view showing a detailed structure of a relief valve in the oil filter of FIG.

FIG. 5 is an enlarged view showing a detailed structure of a modified example of the relief valve of FIG.

[Explanation of symbols]

 Reference Signs List 10 cap (casing) 20 case (casing) 25 oil inlet 26 oil outlet 31 filter element 35 relief valve housing (isolation member) 35c oil passage (oil passage) 35d valve seat 50 relief valve (valve) 51 valve body ( Movable valve part) 52 Leaf spring part 53 Clip-shaped fixing part (holding part) 100 Oil filter

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G015 BG03 BG14 BG16 DA02 DA07 DA11 EA05 EA11 4D026 AB14 AC02 4D064 AA23 BM14 BM16

Claims (5)

[Claims] 1. A casing which accommodates a substantially cylindrical filter element for filtering oil and has an oil inlet and an oil outlet on a bottom surface thereof, which is disposed inside the filter element in the casing and which is on the oil inlet side. And a valve body for allowing oil flowing from the oil outlet to escape to the oil outlet side without passing through the filter element. A movable valve portion that allows the passage of oil to an oil outlet side, wherein the movable valve portion and a valve seat portion on the casing side facing the movable valve portion are in a line sealing state by planar line contact. Oil filter. 2. The filter element according to claim 1, further comprising an isolation member for isolating the dirty oil side and the pure oil side of the filter element, wherein the isolation member has the valve seat formed therein, and the dirty oil side and the pure oil side. The oil filter according to claim 1, wherein an oil passage communicating with the side is formed. 3. The oil filter according to claim 2, wherein the valve body includes the movable valve portion, a spring portion, and a holding portion, and is fixed to the isolation member side by the holding portion. . 4. The oil filter according to claim 2, wherein the separating member is press-fitted and fixed to the casing side. 5. A substantially cylindrical filter element for filtering oil, which is disposed inside the filter element in a casing having an oil inlet and an oil outlet on a bottom surface thereof, and is supplied from the oil inlet side. An oil filter valve body for allowing oil to escape to the oil outlet side without passing through the filter element, wherein the oil from the oil inlet side to the oil outlet side when the oil pressure at the oil inlet becomes a predetermined pressure or more. A movable valve portion that allows the passage of the movable valve portion, a spring portion that urges the movable valve portion to a valve seat portion on the casing side facing the movable valve portion, and a holding portion that fixes the movable valve portion and the spring portion to the casing side. Wherein the movable valve section and the valve seat section are in a line sealing state by planar line contact.