JPH0353688Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a filter device for filtering fluid, and in particular, when a large pressure difference occurs between the inside and outside of the filter element due to clogging, etc., the invention bypasses the filter element. The present invention relates to a filter device equipped with a relief valve that allows fluid to pass through.

<Prior Art> In general, a filter device such as an oil filter used in an automobile engine has a filter element, which is formed by folding a bellows-shaped filter paper and wrapping it around in a cylindrical shape, and closing both ends of the filter paper with end plates, inside a filter case. It is constructed by being locked and stored with a presser spring, and the oil is filtered by passing the oil from the outside to the inside or from the inside to the outside of the filter paper. . By the way, if the filter paper becomes clogged, the amount of oil passing through it will be significantly reduced, making it impossible to supply the necessary amount to the lubricating parts of the engine, resulting in various problems.

Therefore, conventionally, as shown in Japanese Patent Application Laid-Open No. 52-59239, a relief valve was provided to communicate the inside and outside of the filter paper, and when the filter paper became clogged and a large pressure difference was generated between the inside and outside of the filter paper, The pressure difference automatically opens the relief valve to bypass the filter paper and allow the oil to flow.

<Problems to be solved by the invention> However, such conventional filter devices,
A valve hole that communicates with the inside and outside of the filter paper, a valve element that opens the valve hole, a spring that biases the valve element in the opening direction, a filter element, and a holding spring thereof are each formed separately. As a result, the number of parts increased and the structure of the relief valve became complicated, making it difficult to assemble.

In addition, the valve body and spring, and the end plate of the filter element and its holding spring are made of metal, and as the number of metal parts increases, there is a problem in that the weight increases. Ta.

The present invention was devised in view of the above circumstances, and its purpose is to provide a filter device that can reduce the number of parts and weight, and is easy to assemble.

<Means for solving the problem> In order to achieve the above object, the filter device of the present invention has a base plate attached to the opening side of a cylindrical filter case with one end closed, and a base plate is installed inside the filter case. A cylindrical filter element is held and housed by pressing it from the closed end side of the filter case toward the base plate side with a pressing spring, and the inner part of this filter element has a primary side chamber and a secondary chamber separated by the filter element. In a filter device provided with a relief valve that opens when the differential pressure between the side chamber and the side chamber becomes equal to or higher than a predetermined pressure, the presser spring is integrally extended radially outward from the annular frame portion and the frame portion. The frame body is directly adhered to the filterment, and the valve seat of the relief valve is integrally attached to the inner peripheral edge of the frame body, and the valve seat of the relief valve is The body includes a valve portion that abuts the valve seat, a frame portion that is fixed to the valve seat, and a connecting portion that connects the valve portion to the frame portion and urges the valve portion in a seating direction. was cut out from a single spring plate.

<Operation> According to the present invention configured as described above, when a pressure difference of a predetermined value or more occurs between the inside and outside of the filter element, the valve portion separates from the valve seat while the connecting portion is bent. The inside and outside of the filter element are communicated with each other, and the fluid is passed through this communication gap, bypassing the filter paper. Also,
When assembling, the filter element, its presser spring, and relief valve are assembled in advance by integrally assembling the filter element, and then the assembly is housed in the filter case, which simplifies the assembly work. Furthermore, the valve body is 1
A valve part, a frame part, and a connecting part are cut out from a single spring plate, and this connecting part functions as an urging spring, and the holding spring has its frame part directly adhered to the filter element, so that the end of the holding spring is attached to the filter element. It is possible to have the function of a plate, thereby reducing the number of parts, thereby achieving weight reduction and further improvement in assemblability.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a filter device showing one embodiment of the present invention, and an example will be described of an oil filter used for engine lubrication.

The oil filter 10 shown in the figure mainly consists of a cylindrical filter case 12 with one end closed and a filter element 14 housed within the filter case 12. A base plate 16 for locking the element 14 is integrally attached.

The filter element 14 includes a filter paper 18 which is bent into a bellows shape and formed into a cylindrical shape by going around the circumference, and an annular end plate 2 which is adhered to the lower end 18a of the filter paper 18 to close it.
0, and a reinforcing cylinder 22 formed of a punching plate or the like provided on the inner periphery of the filter paper 18.

A mounting hole 20a is provided in the center of the end plate 20.
is formed, and the annular protrusion 16a of the base plate 16 is fitted into the mounting hole 20a. Filter element 14 and filter case 1
2, and between the upper end 14a of the filter element 14 and the closed end 12a of the filter case 12 is a presser spring that presses and fixes the filter element 14 from the closed end 12a side to the base plate 16 side. 26 are interposed.

This presser spring 26 has an annular frame portion 2.
6a, and a plurality of leaf springs 26b bent radially outward and upward at appropriate intervals along the circumferential side of the frame body portion 26a. The frame portion 26a is directly bonded to the inner peripheral side of the upper end surface of the filter element 14, and the tip portion of the leaf spring 26b is brought into contact with the inner surface of the closed end 12a of the filter case 12.

Further, the upper end portion 14a of the filter element 14
A relief valve 28, which will be described in detail later, is provided on the inside of the filter case 12, and the relief valve 28, the filter element 14, and the base plate 16 allow the filter case 12 to have a primary supply outside the filter element 14. A secondary side chamber 30a is separated inside the side chamber 30.

An oil inlet 32 facing the primary side chamber 30 is formed at the peripheral edge of the base plate 16,
Further, an oil inlet 34 facing the secondary side chamber 30a is formed inside the annular protrusion 24a at the center thereof, and the oil introduced into the filter case 12 from the inlet 32 is transferred to the filter paper 18. from the outside to the inside, that is, from the primary side chamber 30 to the secondary side chamber 3
0a and is filtered, and this filtered oil is passed from the inside of the reinforcing cylinder 22 to the annular protrusion 16a.
The lubricant is supplied to the target lubricating site via a take-out pipe 36 screwed into the outlet port 34 of the lubricant.

The relief valve 28 opens when the pressure difference between the primary chamber 30 and the secondary chamber 30a exceeds a predetermined pressure, and the oil in the primary chamber 30 bypasses the filter paper 18 and flows into the secondary chamber 30a. The second one
As shown in the figure, it consists of an annular valve seat 38 provided at the upper end of the secondary side chamber 30a and a valve body 40 seated on this valve seat 38.

The valve body 40 is formed from a single circular spring plate 42, as shown in FIG. That is, the spring plate 42 has an annular frame portion 44 on its periphery, and a valve portion 4 that can come into contact with the valve seat 38 from the secondary chamber 30a side in the center.
6, and three arcuate connecting portions 48 are cut out and integrally formed between the frame portion 44 and the valve portion 46 to connect them.

As shown in FIGS. 1 and 2, the frame portion 44 is caulked and integrally fixed to the peripheral edge of the valve seat 38.
In addition, the seating portion 38a of the valve seat 38 is located inward of the filter element 14 from the fixed position of the frame portion 44,
That is, it is formed to protrude in the valve opening direction of the valve portion 46. As a result, the connecting portion 48 of the reelerator valve 28 is bent in its closed state, and the connecting portion 48 is bent.
serves as a biasing spring that presses the valve portion 46 onto the seating portion 38a to seat it.

Further, the relief valve 28 is configured such that the outer peripheral edge 38a of the valve seat 38 is integrally attached to the inner peripheral edge of the frame portion 26a of the presser spring 26.

That is, the presser spring 26 has its frame portion 26
a is brought into direct contact with the upper end surface of the filter paper 18, and the inner circumferential edge of the frame portion 26a is bent downward into a cylindrical shape and fitted onto the inner circumferential surface of the reinforcing tube 22,
Furthermore, the tip portion is folded back inward in the radial direction. The outer circumferential edge 38a of the valve seat 38 is press-fitted and fixed into the cylindrical bent portion 26c of the frame portion 26a, and the lower surface of the outer circumferential edge 38a is adhered to the folded portion 26d of the inner circumferential edge of the frame portion 26. At the same time, the press-fit portion is sealed with a sealing material.

With the above-described configuration, in the filter device of this embodiment, the relief valve 28 normally has the valve portion 46 seated on the valve seat 38 by the spring force of the arc-shaped connecting portion 48, so that the primary side chamber 30 and the secondary side chamber 30a are connected to each other. is defined. At this time, since the valve part 46 is given an initial load due to the bending of the arcuate connecting part 48, the sealing force when the relief valve 28 is closed increases, and the oil between the primary chamber 30 and the secondary chamber 30a is Leakage is ensured to be prevented. If the filter paper 18 becomes clogged during long-term use,
The amount of oil passing through this filter paper 18 is significantly reduced. At this time, the pressure in the primary chamber 30 outside the filter paper 18 is significantly higher than that in the secondary chamber 30a inside, creating a large pressure difference therebetween. and,
When this pressure difference reaches a predetermined pressure, the arcuate connecting portion 48
is bent, the valve portion 46 is separated from the valve seat 38, and the primary side chamber 30 and the secondary side chamber 30a are communicated with each other. In addition,
When the valve portion 46 is unseated, the valve portion 46 is regulated by the arcuate connecting portion 48 and undergoes a slight rotation. The oil in the primary chamber 30 bypasses the filter paper 18 and flows into the secondary chamber 30a from the gap between the valve portion 46 and the valve seat 38, thereby reducing the minimum required amount of oil to be supplied to the lubricated parts. Secured. When the filter paper 18 is clogged in this way, unfiltered oil is supplied to the lubricated parts, but this is highly effective in preventing the lubricated parts from becoming stiff.

By the way, in this embodiment, the relief valve 2
8, a valve seat 38 is integrally attached to an annular frame portion 26a of a presser spring 26 of the filter element 14, and the frame portion 26a of the presser spring 26 is attached to the filter paper 1 of the filter element 14.
Since the relief valve 28, the presser spring 26, and the filter element 14 are directly bonded to the upper end of the filter element 8 and are integrally assembled, the ease of assembly is significantly improved.

That is, when assembling the oil filter 10, the frame portion 48 of the valve body 40 is
8a and integrally fix the relief valve 36.
, and after fixing this valve seat 30 to the inner peripheral edge of the presser spring 14 by press fitting, etc., this presser spring 14 is attached to the filter element 20.
Since the filter paper 12 can be directly adhered to the filter paper 12, the filter paper 12 can be assembled in advance, and the assembly can then be housed in the filter case 12, the assemblage becomes extremely simple.

Further, the valve body 40 of the relief valve 28 is formed by simply cutting out the valve portion 46, the frame portion 44, and the connecting portion 48 that connects them and functions as an urging spring from a single spring plate 42. Therefore, the structure is significantly simplified and the number of parts is reduced.

Furthermore, the presser spring 26 has its frame portion 2
6a is bonded directly to the filter element 14, this presser spring 26 can have the function of a conventional end plate, and the end plate can also be eliminated, reducing the number of parts. It becomes possible to achieve weight reduction and further improvement in assemblability.

In addition, when the frame body part 26a of the presser spring 26 is made to have the function of an end plate in this way, as shown in FIG. 4, the frame body part 26a
Since it is not possible to cover the entire upper end of the filter paper 18, a portion 19 is formed on the outer circumferential side of the filter paper 18 that is bent in an accordion shape and the outer surface and the inner surface of the filter paper 18 communicate with each other. Put it away. Therefore, it is necessary to seal the communicating portion 19 by filling it with an adhesive 21 or the like.

Further, in this embodiment, a case is shown in which three arc-shaped connecting portions 44 are provided, but the present invention is not limited to this, and two or four or more may be provided, and these arc-shaped connecting portions 48a are arranged in the circumferential direction. It is desirable to arrange them at equal intervals. In addition, in this embodiment, the oil filter 1
0 is shown as an example, but the fluid to be applied is not limited to oil, and other fluids may be used.

FIGS. 5 and 6 each show a modification of the coupling structure between the valve seat 38 and the frame portion 26a of the presser spring 26. FIG.

What is shown in FIG. 5 is the embodiment shown in FIG. 2, in which the tip of the outer circumferential edge 38a of the valve seat 38 to which the frame portion 44 of the valve body 40 is fixed by caulking is further folded back radially outward in the opposite direction. The relief valve 28 is fixed to the frame portion 26a of the presser spring 26 by caulking, and in this way, the relief valve 28 can be fixed even more firmly.

In addition, in the case shown in FIG. 6, the outer peripheral edge 38a of the valve seat 38 is caulked in an S-shape like the one shown in FIG.
The frame body part 26a of the presser spring 26 is fixed to the filter paper 18 of the filter element 14 while the valve seat 38 side is press-fitted onto the outer peripheral surface of the reinforcing tube 22, etc. By doing so, the bonding area between the frame portion 26a and the filter paper 18 can be increased, and the function as an end plate can be improved.

<Effects of the invention> As explained above, the filter device of the invention has the following effects:
The filter element press spring is directly adhered to the filter paper of the filter element, the relief valve is fixed to the press spring, and the filter element, press spring, and relief valve are integrated into an assembly. The structure of the filter device has been significantly simplified, the number of parts has been reduced, and assembly performance has been significantly improved. Cost reductions have also been achieved, as well as significant weight reduction. It has a great effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part showing an embodiment of a filter device using the relief valve of the present invention, Fig. 2 is an enlarged sectional view of the main part of the invention, and Fig. 3 is a sectional view of a filter device used in the relief valve of the present invention. FIG. 4 is an enlarged plan view showing an embodiment of the valve body, FIG. 4 is a view showing the upper end surface of the filter element, and FIGS. 5 and 6 are sectional views of main parts showing modified embodiments of the present invention. 10...Oil filter (filter device), 1
2... Filter case, 14... Filter element, 16... Base plate, 18... Filter paper,
26... Holder spring, 26a... Frame body part,
26a... Leaf spring part, 28... Relief valve, 38... Valve seat, 40... Valve body, 42... Spring plate, 44... Frame part, 46... Valve part, 48... Connection part.

Claims (1)

[Scope of utility model registration request] A base plate is attached to the opening side of a cylindrical filter case with one end closed, and a cylindrical filter element is held inside the filter case and pressed from the closed end side of the filter case to the base plate side using a spring. A filter device that is locked and stored, and is provided with a relief valve in the inner part of the filter element that opens when the differential pressure between the primary side chamber and the secondary side chamber separated by the filter element exceeds a predetermined pressure. wherein the presser spring is formed of an annular frame portion and a leaf spring portion integrally extending radially outward from the frame portion, and the frame portion is directly adhered to the filterment; The valve seat of the relief valve is integrally attached to the inner peripheral edge of the frame body, and the valve body of the relief valve includes a valve portion that abuts the valve seat, and a frame portion that is fixed to the valve seat. and a connecting portion that connects the valve portion to the frame portion and biases the valve portion in a seating direction, and are formed by cutting out a single spring plate.