JP2001179770A - Method for producing oil filter element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a cylindrical oil filter element in which a filter sheet is also installed in the bottom part. SOLUTION: A mesh sheet 40 which forms the shape of the filter sheet of the cylindrical oil filter element spread into a plane is fitted to a projection 11 formed in a lower mold 10. The projection has the same shape with the element. After the recessed part 21 of an upper mold 20 is engaged with the projection 11, a frame forming material is injected in grooves 22 formed around the recessed part 21 to form the frame of the element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an oil filter element and a mold used for manufacturing the oil filter element.

[0002]

2. Description of the Related Art FIG. 9 shows an example of a conventional oil filter element. The oil filter element 50 shown in FIG. 9 has a cylindrical shape with a bottom that is open at the top, and has an opening formed in parallel on a side wall between a plurality of columns 51a. It comprises a frame 51 and a mesh-like filtering material 52 made of synthetic resin and stretched over an opening formed in the side wall of the frame 51.

The oil filter element 50 has an outer diameter of a frame 51 of about 10 mm and a height of about 12 mm.

FIG. 10 is a sectional view of an oil filter 53 equipped with the oil filter element 50 shown in FIG.

In FIG. 10, a concave portion 53a having a circular section is formed in a cap 53, and a cap 54 having an external thread formed on an outer peripheral wall is formed in the concave portion 53a. Are adapted. The oil filter element 50 is fitted into the concave portion 53a of the cap 53 on the open side, and in this state, the cap 54 is screwed into the concave portion 53a so that the oil filter element 50 is fixed inside the cap 54. Placed.

A bellows 55 made of rubber protrudes from a concave portion 53a of the cap 53. An oil outlet 54a is formed at the tip of the cap 54.

The oil containing impurities is discharged from the bellows 55, passes through the mesh filter 52 of the oil filter element 50, and is discharged from the oil outlet 54a. When the oil passes through the mesh filter 52, impurities contained in the oil are caught by the mesh filter 52, and oil containing no impurities is discharged from the oil outlet 54a.

[0008] Such an oil filter element 5
Various devices or methods for forming 0 have been proposed so far.

For example, Japanese Patent Laying-Open No. 6-182809 proposes a method of manufacturing an oil filter element in which a plurality of oil filter elements 50 shown in FIG. 9 are simultaneously formed. FIG. 11 is a schematic diagram of an apparatus 60 used when carrying out the oil filter element manufacturing method proposed in the publication.

A plurality of cylindrical molding cores 62 are arranged in a line between a pair of split dies 61a and 61b. Each split mold 61a, 61b is provided with each molding core 62.
Are formed to form a plurality of semicircular molding recesses 63. Each molding recess 63 has a frame 5
Grooves 63a for injection-molding one support 51a are provided at intervals of 90 degrees.

Adjacent to each of the split dies 61a and 61b, a filter material roll 64 in which a sheet-like mesh filter material 52 is wound in a roll shape is arranged. Between them, the sheet-like mesh filter material 52 is continuously supplied from each filter material roll 64.

The apparatus 60 having the above configuration operates as follows.

First, the split dies 61a and 61b are kept open, that is, the split dies 61a and 61b are separated from each other. Under this state, the sheet-like mesh filter material 52 is supplied from each filter material roll 64 between each of the split dies 61 a and 61 b and the molding core 62.

Next, the split dies 61a and 61b are closed.
That is, the split dies 61a and 61b are brought into close contact with each other. As a result, the two sheet-like mesh filter materials 52
Are sandwiched between the semicircular molding recesses 63 of the split dies 61a and 61b and the molding cores 62, and the respective forming cores 6
It is bent so as to surround half of the circumference of 2.

Next, the oil filter element 50
By injecting the synthetic resin constituting the frame 51 into the molding recesses 63 formed around each molding core 62 and other cavities, the frame 51 is injection molded.

In this manner, a plurality of molded products in which the mesh filter material 52 is welded to the frame 51 are obtained.

Next, the split dies 61a and 61b are opened, and the molded product is taken out. In this state, a plurality of oil filter elements 50 are connected via an overlapping portion composed of two mesh filter materials 52 overlapping each other.

Next, an oil filter element 50 as shown in FIG. 9 can be obtained by cutting the overlapping portion of the two mesh-like filter media 52 using an appropriate cutting tool.

[0019]

According to the oil filter element manufacturing method shown in FIG. 11, there is an advantage that a plurality of oil filter elements 50 can be manufactured at one time.

However, the oil filter element which can be manufactured by the oil filter element manufacturing method shown in FIG. 11 is an oil filter element 50 as shown in FIG. Only the oil filter element provided with 52 is provided. For example, an oil filter element in which a mesh filter material 52 is also provided at the bottom of the frame 51 cannot be manufactured by the oil filter element manufacturing apparatus 60 shown in FIG.

Further, the oil filter element which can be manufactured by the oil filter element manufacturing method shown in FIG. 11 is limited to a cylindrical shape. For example, it is not possible to produce conical, triangular or square pyramidal or other polygonal pyramidal oil filter elements.

Further, according to the oil filter element manufacturing method shown in FIG. 11, each split mold 61a, 61
b, when the plurality of oil filter elements 50 are connected to each other, the two mesh filter members 52 overlap each other.
Since the connection is made via an overlapping portion made of the following, the step of cutting the overlapping portion made of the two mesh-like filter media 52 is indispensable in order to separate each oil filter element 50.

However, since the length of the overlapping portion is not so long (for example, about 5 mm), the oil filter element 50 may be erroneously damaged during this cutting step.

The present invention has been made in view of the above-mentioned problems in the conventional method for manufacturing an oil filter element, and it is an object of the present invention to form a cylindrical oil filter element provided with a mesh filter also at the bottom. It is possible to form a conical or polygonal pyramid-shaped oil filter element in addition to the cylindrical shape.
An object of the present invention is to provide a method for manufacturing an oil filter element that can avoid a cutting step that may damage the oil filter element.

[0025]

In order to achieve this object, a first aspect of the present invention is a frame having at least one opening surface, and a filtering sheet attached to the frame so as to cover the opening surface. And a first step of forming a mesh-like sheet having a shape when the filter sheet is developed on a plane, and a projection having the same shape as the shape of the oil filter element. A second step of attaching the mesh-like sheet to the projections of the first mold having a third step of fitting the recesses of the second mold having recesses that can be fitted into the projections, Injecting a material for molding the frame between the first and second molds, a fourth step of molding the frame,
And a method for producing an oil filter element comprising:

In the method for manufacturing an oil filter element according to the present invention, first, a mesh sheet having the same shape as the shape when the filtration sheet is developed on a plane is formed. For example, a mesh sheet is formed by stamping out such a shape from a mesh flat sheet. Next, a projection of the first mold having the same shape as that of the oil filter element (for example, a cylindrical projection if the oil filter element is cylindrical).
Fix the mesh sheet around. Thereafter, the second mold is fitted to the first mold, and under that state,
The oil filter element is manufactured by injection molding the frame.

According to the method for manufacturing an oil filter element of the present invention, a cylindrical oil filter element having a mesh filter at the bottom can be formed by appropriately selecting the shape of the mesh sheet. It is possible. That is, by shaping the mesh sheet into a shape that covers the projections of the first mold, a cylindrical oil filter element having a mesh filter at the bottom can be manufactured.

Further, an oil filter element having a shape corresponding to the shape of the projection of the first mold can be manufactured. For example, an oil filter element having a conical or quadrangular pyramid shape can be manufactured by making the shape of the projection of the first mold into a conical or quadrangular pyramid.

In the method for manufacturing an oil filter element according to the present invention, the mesh sheet is cut alone. For this reason, as in the conventional oil filter element manufacturing method shown in FIG. 11, a plurality of oil filter elements 50 connected via an overlapping portion composed of two mesh filter materials 52 overlapping each other are formed. In order to separate the two mesh filters 52
The step of cutting the overlapping portion made of is unnecessary, and the cutting step that may damage the oil filter element can be avoided.

As described in claim 2, the projection formed on the first mold has a flat top surface and a needle-like body provided at the center of the top surface. In this case, it is preferable that in the second step, the mesh-like sheet is fixed to the needle-like body.

By fixing the mesh sheet to the needle-shaped body, it is possible to prevent the mesh sheet from shifting when the second mold is fitted to the first mold. In addition, if a mark is provided at the center of the mesh sheet, the mesh sheet can be easily arranged at a predetermined position by piercing the needle-like body into the mark.

According to a third aspect of the present invention, there is provided a mold used in the method for manufacturing an oil filter element according to the first aspect. That is, claim 3 is a mold used when manufacturing an oil filter element comprising a frame having at least one opening surface, and a filtering sheet attached to the frame so as to cover the opening surface. A first mold having a projection having the same shape as the shape of the oil filter element, and a second mold having a recess capable of fitting into the projection, a mold for manufacturing an oil filter element comprising: provide.

Preferably, the projection has a flat top surface and a needle-like body provided at the center of the top surface.

As described in claim 5, the shape of the projection can be, for example, a column shape or a triangular pyramid shape, but is not limited thereto.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an oil filter element according to one embodiment of the present invention will be described below with reference to FIG. In the method for manufacturing an oil filter element according to the present embodiment, a cylindrical oil filter element as shown in FIG. 3 is manufactured.

The oil filter element 3 shown in FIG.
0 indicates that the outer shape is substantially cylindrical and the upper surface 3
The frame 31 has an opening 0a, a side surface 30b and a lower surface 30c, and a filtering sheet 32 attached to the frame 31 so as to cover the upper surface 30a and the side surface 30b of the frame 31.

The frame 31 has a circular upper surface portion 31a defining the upper surface 30a, a connecting portion 31b formed along one diameter of the upper surface portion 31a, and extends downward from the upper surface portion 31a to define the side surface 30b. Multiple side wall parts 3
1c and a circular lower surface portion 31d joined to the side wall portion 31c and defining the lower surface 30c.

The outer diameter of the upper surface portion 31a is about 10 m
m, the outer diameter of the lower surface portion 31d is about 13 mm, and the frame 31
Has an overall height of about 12 mm.

FIG. 1 is a perspective view of a mold used in the method for manufacturing an oil filter element according to the present embodiment. The mold shown in FIG. 1 includes a lower mold 10 as a first mold and an upper mold 20 as a second mold.

At the center of the surface of the lower mold 10, a projection 11 having the same shape as that of the oil filter element 30, that is, a cylindrical shape is formed. The protrusion 11 has a flat top surface 11a and a needle-like body 11b provided at the center of the top surface 11a.

The upper mold 20 has a concave portion 2 which is open downward.
1 is formed. The recess 21 has the same shape as the cylindrical projection 11 formed on the lower mold 10. For this reason, the protrusion 11 can be fitted into the recess 21.

Further, around the recess 21, a groove 22 for injection molding the frame 31 of the oil filter element 30 is formed. That is, the groove 22 has a shape corresponding to the shape of the frame 31.

Using the lower mold 10 and the upper mold 20 having the above-described structure, the method of manufacturing the oil filter element according to the present embodiment is performed as follows.

First, the mesh sheet 40 having the same shape as the shape of the filter sheet 32 constituting the oil filter element 30 shown in FIG.
To form

FIG. 2 is a plan view of the mesh sheet 40. The mesh-shaped sheet 40 has a circular central portion 40a, which is a portion abutting on the top surface 11a of the projection 11, and extends in four directions at a 90-degree interval from the central portion 40a.
And a plurality of side wall portions 40b. Such a mesh sheet 40 can be formed, for example, by cutting a mesh-shaped flat sheet.

The tip 40c of each side wall portion 40b is formed so as to form a circular arc having a predetermined radius.

Further, the width of each side wall portion 40b is set so as to decrease toward the central portion 40a. The reason why the width of each side wall portion 40b is gradually reduced in this way is that the mesh sheet 40 contracts to some extent during the injection molding of the frame 31, so that the influence of the contraction is absorbed.

The mesh sheet 40 has a central portion 40a.
Is fixed to the needle-shaped body 11a at the center thereof and temporarily fixed.

Next, the upper die 20 is moved downward so that the projections 11 are fitted into the concave portions 21 and joined to the lower die 10. Under this state, the mesh-shaped sheet 40 has a circular central portion 40a overlapping the top surface 11a of the projection 11, and each side wall portion 40b overlapping the peripheral wall of the projection 11.

Next, a melt of a synthetic resin, which is a material for forming the frame 31, is poured from an injection port (not shown) of the upper mold 20 into a groove 22 formed around the recess 21. Thereafter, the melt of the synthetic resin is cured by aging or cooling. Thus, the frame 31 is formed.

Thereafter, the upper mold 20 is moved upward, and the upper mold 20 is separated from the lower mold 10. An oil filter element 30 as shown in FIG. 3 is formed on the projection 11.

As shown in FIG. 4, a step 33 is provided on the inner periphery of the lower surface portion 31d of the frame 31.
By providing the step 33 in this manner, the separation of the filtering sheet 32 from the frame 31 can be prevented.

In the above-described embodiment, the cylindrical oil filter element 30 as shown in FIG. 3 is generated. For example, a triangular pyramid-shaped oil filter element 35 as shown in FIG. 6 is formed. It is also possible.

The oil filter element 35 has a frame 36 having a substantially triangular pyramid outer shape and an open side surface 35a and a lower surface 35b.
And a filtering sheet 37 attached to the frame 36 so as to cover the side surface 35a.

The frame 36 has a circular top portion 36a and a circular lower surface portion 36 having a larger outer diameter than the top portion 36a.
b and three side wall portions 36c extending from the top portion 36a toward the lower surface portion 36b.

The outer diameter of the lower surface portion 36b is about 14 mm, and the overall height of the frame 36 is about 14 mm.

FIG. 5 is a plan view when the filter sheet 37 is developed in a plane. The filter sheet 37 is a lower mold 10
A central portion 37a, which is a portion that comes into contact with the top surface of the triangular pyramid-shaped protrusion, and three fan-shaped side wall portions 37b extending in three directions at an interval of 120 degrees from the central portion 37a. Consists of Such a filtering sheet 37
Can be formed, for example, by cutting a mesh-shaped flat sheet.

The tip 37c of each side wall portion 37b is formed so as to form a circular arc having a predetermined radius.

By forming the projections 11 of the lower mold 10 shown in FIG. 1 in the shape of a triangular pyramid and using the filtering sheet 37 as shown in FIG. 5, the triangular pyramid as shown in FIG. An oil filter element 35 having a shape can be formed.

When the oil filter element 35 having a triangular pyramid shape is formed, the protrusion 11 shown in FIG.
Unlike the case (1), it is not necessary to provide the needle 11b at the tip of the projection 11.

As shown in FIGS. 7 and 8, a step 38 is provided on the inner periphery of the lower surface portion 36b of the frame 36. Thus, by providing the step 38, the separation of the filtration sheet 37 from the frame 36 can be prevented.

[0062]

According to the method for manufacturing an oil filter element according to the present invention, a cylindrical oil filter element having a mesh-like filtering material also at the bottom is formed by appropriately selecting the shape of the mesh sheet. Is possible. That is, by forming a mesh-like sheet having a shape that covers the top surface of the projections of the first mold, a cylindrical oil filter element having a mesh filter material also at the bottom can be manufactured.

Further, an oil filter element having the same shape as the shape of the projection formed on the first mold can be manufactured. For example, an oil filter element having a conical shape or a triangular pyramid shape can be manufactured by making the shape of the projection of the first mold into a conical shape or a triangular pyramid.

In the method for manufacturing an oil filter element according to the present invention, only the mesh sheet
For example, it is formed by cutting a flat mesh sheet. For this reason, as in the conventional oil filter element manufacturing method shown in FIG. 11, a plurality of oil filter elements 50 connected via an overlapping portion composed of two mesh filter materials 52 overlapping each other are formed. In order to separate the two mesh filters 52
The step of cutting the overlapping portion made of is unnecessary, and the cutting step that may damage the oil filter element can be avoided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mold used in a method for manufacturing an oil filter element according to an embodiment of the present invention.

FIG. 2 is a plan view of a mesh sheet used when manufacturing a cylindrical oil filter element.

FIG. 3 is a perspective view of a cylindrical oil filter element formed by an oil filter element manufacturing method according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of the oil filter element shown in FIG.

FIG. 5 is a plan view of a filtering sheet used when manufacturing a triangular pyramid-shaped oil filter element.

FIG. 6 is a perspective view of a triangular pyramid-shaped oil filter element formed by the oil filter element manufacturing method according to the present invention.

FIG. 7 is a longitudinal sectional view of an oil filter element having a triangular pyramid shape.

FIG. 8 is a longitudinal sectional view of an oil filter element having a triangular pyramid shape.

FIG. 9 is a perspective view of a conventional oil filter element.

FIG. 10 is a sectional view of an oil filter equipped with the oil filter element shown in FIG.

FIG. 11 is a schematic view of an apparatus used when carrying out a conventional oil filter element manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower die 11 Projection 20 Upper die 21 Depression 22 Groove 30 Cylindrical oil filter element 31 Frame 32 Filtration sheet 33 Step 40 Mesh sheet 35 Triangular pyramid oil filter element 36 Frame 37 Filtration sheet 38 Step

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat II (reference) // B29L 31:14 B01D 35/02 EF term (reference) 4D019 AA03 BB02 CA03 CA10 CB01 CB06 4D064 AA23 BM03 BM07 BM13 BM17 BM22 EA01 4F202 AD08 AD24 AH03 CA11 CB12 CK11 CL01 CQ01 4F206 AD08 AD24 AH03 JA07 JB12 JF05 JL02

Claims (6)

[Claims] 1. A method for manufacturing an oil filter element comprising: a frame having at least one opening surface; and a filtering sheet attached to the frame so as to cover the opening surface, A first step of forming a mesh sheet having a shape when the sheet for use is developed on a plane, and the mesh sheet on the projection of a first mold having a projection having the same shape as the shape of the oil filter element. A second step of attaching the concave part of the second mold having the concave part capable of being fitted to the projection to the projection, and a material for molding the frame to the first part. And a fourth step of molding the frame by injecting between the second mold and the second mold. 2. The projection has a flat top surface and a needle-like body provided at the center of the top surface. In the second step, the mesh-like sheet is attached to the needle-like body. The method for producing an oil filter element according to claim 1, wherein the oil filter element is fixed. 3. A mold for use in manufacturing an oil filter element comprising: a frame having at least one opening surface; and a filtration sheet attached to the frame so as to cover the opening surface. A first mold having a projection having the same shape as the shape of the oil filter element; and a second mold having a recess capable of fitting into the projection. Type. 4. The oil filter element according to claim 3, wherein the projection has a flat top surface and a needle-like body provided at the center of the top surface. Manufacturing mold. 5. The mold according to claim 3, wherein the projection has a cylindrical shape. 6. The mold for manufacturing an oil filter element according to claim 3, wherein the projection has a triangular pyramid shape.