JPH09136003A - Safety valve device of liquid filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lowering of sealing function due to heat by assembling a safety valve device by only fitting a member thereby to eliminate the need for a welding process. SOLUTION: A valve seat body 15 of synthetic resin is superposed on an end of a filter element 3 and a bypass hole 16 is drilled therein. A spring receiver 21 is mounted to a supporter part 19 formed integrally with the inner surface of the body 15 so as not to laterally slip so that a second spring body (coil spring) 18 supported by the receiver 21 presses a valve body 17 against the valve seat body 15 to close the hole 16. A first spring body (plate spring or coil spring) is attached to a locking claw 21 formed on the outer surface of the body 15 so that the filter element 3 is pressed and fixed by means of the first spring body 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filter, such as an oil filter used in an internal combustion engine for an automobile, when the filter element is clogged and an excessive pressure acts on the fluid. The present invention relates to a safety valve device that allows a fluid to escape toward a hollow portion of a filter element without passing through the element.

[0002]

2. Description of the Related Art A fluid filter of this type is disclosed in, for example, Japanese Patent Publication No. 4-50497 and as shown in FIG. Hollow, tubular filter element 31
Are arranged concentrically, and the filter element 31
The safety valve device 32 is provided at one end of the.
Then, during normal operation, the fluid permeates the filter element 31 inward as shown by the solid arrow, and when the filter element 31 is clogged or the like and excessive pressure acts, the safety valve device 32 is operated. And the fluid flows through the filter element 3 as indicated by the dotted arrow.
It directly flows into the hollow portion from one end portion of 1.

In the safety valve device 32 of Japanese Patent Publication No. 4-50497, a valve seat body 34 made of a metal plate in which a bypass hole 32 is bored is fitted on one end surface of the filter element 31, and the valve seat body 34 is fitted. In addition, a cylindrical metal plate spring receiver 35 protruding into the hollow portion of the filter element 31.
Is fixed by spot welding, and the valve body 3 that closes the bypass hole 33 by the coil spring 36 housed in the spring receiver 35.
7 is pressed against the valve seat body 34, and the valve seat body 34
Has a structure in which a spring piece 34a that contacts the inner surface of the main body case 30 is integrally provided.

When the pressure of the fluid outside the filter element 31 exceeds a certain level, the coil spring 36 is compressed and the fluid flows directly into the filter element 31 through the bypass hole 33. Further, in this prior art, the spring piece 34a is integrally formed on the valve seat body 34,
The reason why the spring piece 34a is applied to the inner surface of the main body case 30 is to press and fix the filter element 31 to prevent the displacement movement.

In this prior art, since the safety valve device 32 is simply superposed on one end face of the filter element 31, the labor of assembling the filter can be reduced, and the valve seat body 34 made of a metal plate can be reduced. Since the filter element 31 is pressed and fixed by the formed spring piece 34a, there is an advantage that the spring piece 37 has high durability.

However, while having such advantages, the valve body 3
7 and the coil spring 36 are incorporated in the spring receiver 35, and the spring receiver 35 is spot-welded to the valve seat body 34 while holding the state with a jig. Therefore, the valve seat body 34 is heated by the heat generated by the spot welding. However, there is a problem that there is a risk that the material may be deformed and the sealing performance may be impaired. An object of the present invention is to solve this problem.

[0007]

In order to achieve this object, the present invention provides a hollow cylindrical filter element having both ends opened in a bottomed cylindrical main body case having one end closed and the other end opened. Are arranged concentrically, and the filter element is pressed and fixed by a first spring body interposed between one end surface of the filter element and one end portion of the main body case, so that the fluid flows from the outside to the inside of the radius of the filter element. As a safety valve device for a fluid filter configured so as to permeate toward, the "valve seat body that closes the hollow portion is superposed on one end portion of the filter element, and the valve seat body is A valve body which is provided with a bypass hole communicating with the inside and the outside, and which closes the bypass hole of the valve seat body at a portion located in the hollow portion of the filter element with the valve seat body sandwiched between the valve body and the valve body. A second spring body for urging the valve seat body in a direction in which the valve seat body is brought into close contact with the valve seat body, and the surface of the valve seat body facing the hollow portion of the filter element surrounds the valve body and the second spring body. Is integrally provided, and on the surface of the valve seat body facing the hollow portion of the filter element,
A support portion is integrally provided so as to surround the valve body and the second spring body, and the second spring body is supported so as not to fall off by a spring receiver mounted on the support portion so as not to be displaced, or The support portion is formed so as to be flexibly deformable in the radial direction, and the second spring is supported by an inward claw provided at the tip thereof,
The first spring body, which is separate from the valve seat body, is interposed between the valve seat body and the closed portion at one end of the main body case. "

[0008]

According to this structure, when the second spring body is supported by the spring receiver mounted on the support portion of the valve seat body, the valve body and the spring body are fitted into the support portion to The two spring bodies are placed in a region surrounded by the supporting portion in a compressed state, and then a spring seat is attached to elastically restore the second spring body, whereby the spring seat and the second spring body are seated. It is possible to attach it to irremovably.

On the other hand, when a pawl is provided at the tip of the support portion of the valve seat and the second spring body is supported by the pawl, the support portion is surrounded by the support portion while being elastically deformed. By fitting the valve body and the second spring body into the portion and then restoring the support portion, the second spring body can be attached to the valve seat body in a non-separable state. In any of these cases, the valve body can also be held irremovably by fitting the second spring body to the valve body.

As described above, even if the members are not spot-welded, the safety valve device can be assembled by fitting them by utilizing elastic deformation of the members. Therefore, the valve seat body and the valve seat are deformed by heat. Therefore, it is possible to eliminate the possibility that the sealing property with the body is deteriorated. Further, since the first spring body for pressing and fixing the filter element is configured separately from the valve seat body, the first spring body should be made of a highly durable metal such as a leaf spring or a coil spring. Therefore, the reliability can be improved, and the valve seat body is pressed and fixed to the filter element by the first spring body, so that the filter can be assembled very easily.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
~ It demonstrates based on FIG. 5). 1 to 4 show a first embodiment, of which FIG. 1 is an overall view of an oil filter for an internal combustion engine. The oil filter 1 includes a body case (housing) 2 made of a metal plate that closes one end 2a and opens the other end. Inside the body case 2, a hollow tubular filter element 3 is concentrically arranged. Has been done. A large number of through holes 4 are formed in the inner peripheral wall of the filter element 3.
Has been drilled.

A ring-shaped cover plate 5 is fixed to the opening of the main body case 2 by winding, and an O-ring 6 for sealing is fitted on the outside of the cover plate 5. Inside the lid plate 5, a bottom plate 1 made of a synthetic resin is provided with an outflow port 8 and an inflow port 9.
0 is arranged. A valve disc 11 made of an elastic material such as synthetic resin or rubber is interposed between the bottom plate 10 and the filter element 3.

On the other hand, a first spring body 12 made of a metal plate such as a leaf spring is arranged between one end of the filter element 3 and one end 2a of the main body case 2. The filter element 3 is fixed to the valve disc 11 by pressing. Inlet 8 of bottom plate 10
The oil flowing into the filter element 3 flows to the outside of the filter element 3, passes through the filter element 3 in a normal filtration state, flows into the hollow portion 13 from the through hole 4, and is discharged from the outlet port 9.

A safety valve is provided at one end of the filter element 3 for allowing the oil to directly escape into the hollow portion of the filter element 3 when the oil pressure becomes excessive due to clogging of the filter element 3 or the like. Device 1
4 are provided. This will be described below. FIG. 2 is an enlarged view of the mounting state of the safety valve device 14, and FIG. 3 (A) is an exploded perspective view of the safety valve device 14.

The safety valve device 14 includes a valve seat body 15 made of synthetic resin, which is superposed on the end surface of one end of the filter element 3, and a valve body 17 for closing a bypass hole 16 formed in the valve seat body 15. , A second spring body (compression coil spring) for pressing and fixing the valve body 17 to the valve seat body 15
18 is provided. The valve body 17 is made of a metal plate or synthetic resin.

The valve seat body 15 is arranged so that its bypass hole 16 communicates with the inside and outside of the filter element 3, and the valve body 17 closes the bypass hole 16 from the hollow portion 13 side of the filter element 3. I'm out. In FIG. 3, a partial view (B) is a plan view of the first spring body 12, and a partial view (C).
Is a plan view of the valve seat body 15, and FIG. 3D is a perspective view of the valve seat body 15. As shown in FIGS. 3A and 3D, the filter element of the valve seat body 15 is shown. A support portion 19 composed of four legs 19a and a ring portion 19b connected to the ends thereof is integrally formed on the surface of the hollow body 3 facing the hollow portion. The support portion 19 is formed so as to surround the valve body 17 and the second spring body 18.

As shown in FIGS. 3A and 3D and FIG. 4A, bypasses are provided at both sides of the ring body 19b forming the support portion 19 of the valve seat body 15 with the axis center therebetween. By forming a pair of engagement grooves 20 that open toward the direction of the holes 16 and fitting projections 21 a formed at both ends of a plate-shaped spring receiver 21 into the engagement grooves 20, the spring receiver 2
1 supports the second spring body 18. The spring receiver 21 is made of a metal plate or synthetic resin.

As shown in FIGS. 2 and 3D, the valve seat body 1
Locking claws 21 are integrally formed radially outward at four locations on the outer surface of 5 along the circumferential direction.
Is elastically inserted into the engagement hole 22 formed in the first spring body 12 so as to resist the elasticity of the first spring body 12 and the valve seat body 1.
5 and 5 are held in a non-separable state. First spring body 12
Has a hole 12a communicating with the bypass hole 16 of the valve seat body 15.
Has been drilled.

Although the first spring body 12 is formed in a substantially H shape in a plan view, it may have another shape such as a circle or a star. Also,
The periphery of the engagement hole 22 of the first spring body 12 is formed to bulge outward (burring), and in this case, the engagement hole 2 is formed.
Compared with the case of punching out 2, the rattling can be suppressed in the state where the length of the locking claw 21 of the valve seat body 15 is long, and therefore there is an advantage that the locking claw 21 can be easily deformed.

In the above structure, the valve body 17 and the second spring body 18 are attached to the valve seat body 15 by inserting the valve body 17 and the second spring body 18 into the support portion 19 of the valve seat body 15. hand,
The second spring body 18 is compressed by using a jig (not shown), and the spring receiver 21 is supported by the support portion 19 while maintaining the state.
The spring receiver 21 is fitted into the engaging groove 20 of
Is attached to the support portion 19, and then the second spring body 18 is restored. Further, the valve seat body 15 and the first spring body 12 may be assembled by fitting the respective locking claws 21 into the engagement holes 22 against the elasticity of the locking claws 21 and the first spring body 12. .

As described above, since the safety valve device 14 is assembled by merely fitting, there is no possibility that the members will be deformed due to heat as in the case of assembling by spot welding. Therefore, the valve seat body 15 and the valve are not deformed. The function of sealing the body 17 can be maintained. By the way, the oil filter 1 is used when the internal combustion engine is operating or when it is suddenly accelerated.
The pressure in the inside of the first spring body 12 changes rapidly.
A large shock is repeatedly applied to
Therefore, if the first spring body 12 is made of synthetic resin, a sag phenomenon may occur. On the other hand, in the present invention, the first spring body 12 is separate from the valve seat body 15, and the first spring body 12 can be made of a metal plate such as a leaf spring having high durability. Therefore, high reliability can be obtained.

The first spring body 12 and the valve seat body 1 as in the embodiment
By assembling the oil filter 5 and the oil filter 5 in a non-separable manner, the work of assembling the oil filter 1 can be made easier. FIG.
As shown in (B), the engaging hole 22 may be formed by cutting and raising the first spring body 12, and the engaging claw 22 may be engaged with the cut and raised piece 22a. With the rattling of the valve seat body 15 and the first spring body 12 suppressed, the length of the locking claw 21 of the valve seat body 15 can be made longer, so that the locking claw 21 can be deformed more easily. The valve seat body 15 and the first spring body 12
There is an advantage that it is easier to assemble.

FIG. 5A shows a second embodiment in which the first spring body 12 is a coil spring, and in this embodiment as well,
With the same four locking claws 21 as in the first embodiment, the first
The spring body 12 is held so that it cannot be pulled out. In other words, whether the first spring body 12 is a leaf spring or a coil spring can be fixed by the locking claw 21. Needless to say, the number of locking claws 21 can be set to an appropriate number.

FIG. 5 (B) shows a third embodiment which is a modification of the spring receiver 21. In this embodiment, the support portion 19 of the valve seat body 15 is formed in a cylindrical shape, and a plurality of (for example, four) window holes 24 are formed in the support portion 19, while the spring bearing 2 is formed.
1 is formed in the shape of a bottomed cylinder that fits in the support portion 19, and the hook piece 21b protruding from the spring receiver 21 is fitted into the window hole 24 of the support portion 19 against the elasticity thereof. It was done like this.

According to the embodiment shown in FIG. 5 (B), the second spring 18 can be securely held in an unseparable state by a one-touch operation of merely pushing the spring receiver 21 in the axial direction of the support portion 19. There is. In each of the above-described embodiments, the spring receiver 21 is attached to the support portion 19 of the valve seat body, and the second spring 18 is supported by the spring receiver 21, but the support portion 19 is not included in the first embodiment. In the state without the ring portion 19b, that is, in the state where only the plurality of foot portions 19a are projected, a radially inward claw is formed at the tip of each foot portion 19a, and the second spring 18 is formed by this claw. You may support it.
In this case, the mounting of the second spring 18 is performed by the foot portion 19a.
Is elastically deformed outward in the radius.

Although the above embodiment is applied to an oil filter for an internal combustion engine, it goes without saying that the present invention can also be applied to other fluid filters.

[Brief description of the drawings]

FIG. 1 is an overall view of an oil filter according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the safety valve device in FIG.

3A is an exploded perspective view of a safety valve device, FIG. 3B is a plan view of a leaf spring first spring body, and FIG. 3C is a plan view of a valve seat body.
(D) is a perspective view of a valve seat body.

FIG. 4A is a cutaway perspective view of a support portion of a valve seat body,
(B) is a figure which shows another example of the engagement hole in a 1st spring body.

5A is a sectional view of a second embodiment, and FIG. 5B is a sectional view of a third embodiment.

FIG. 6 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Oil Filter 2 Body Case 3 Filter Element 12 First Spring Body 13 Hollow Portion 14 Safety Valve Device 15 Valve Seat Body 16 Bypass Hole 17 Valve Body 18 Second Spring Body 19 Support Portion 21 Spring Bearing

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location F16K 17/04 B01D 35/14 101 (72) Inventor Hiroshi Kohira 652 Takamiya, Neyagawa, Osaka Prefecture 69 shares of the company BCE Manufacturing Co., Ltd. (72) Inventor Masaaki Kohira 69 shares of the company BCE Manufacturing Company of 652 Takamiya, Neyagawa City, Osaka Prefecture

Claims (1)

[Claims] 1. A hollow-cylindrical filter element having both ends opened in a bottomed cylindrical main body case having one end closed and the other end opened, and the filter element is provided with the hollow cylindrical filter element. In the fluid filter, the first spring body is interposed between one end surface of the main body case and one end surface of the main body case, and the fluid is transmitted from the outside of the radius of the filter element to the inside thereof. A safety valve device for allowing a fluid to directly flow from one end of the filter element into the hollow portion when the pressure of the fluid becomes excessive outside the filter element, wherein the hollow portion is provided at one end of the filter element. The valve seats that are closed are stacked, and the valve seat is provided with a bypass hole that communicates with the inside and outside of the filter element. A valve element for closing the bypass hole of the valve seat body and a second spring body for urging the valve body in a direction in which the valve seat body is brought into close contact with the valve seat body, A support part that surrounds the valve body and the second spring body is integrally provided on the surface of the valve seat body that faces the hollow portion of the filter element, and a spring receiver that is attached to the support portion so as not to be displaced is provided. The second spring body so as not to fall off, or this support portion is formed so as to be flexibly deformable in the radial direction, and the second spring is supported by an inward claw provided at the tip thereof. A safety valve device for a fluid filter, wherein the first spring body, which is separate from the valve seat body, is interposed between the valve seat body and the closed portion at one end of the main body case.