JPH0847608A - Oil filter - Google Patents

Abstract

PURPOSE:To provide an inexpensive oil filter with a simple structure. CONSTITUTION:This oil filter 1 houses a filtering body 30 in a container 10. The container 10 has a case 20, a bottom plate 11 and an annular packing 25. The bottom plate 11 consists of a single member and the annular packing 25 is inserted into an annular groove 15 of the bottom plate 11. The bottom plate 11 is fixed with the case 20 by welding. Or plural pawl parts 17. are projected on the edge part of the annular groove 15 and the annular packing 25 is engaged with the annular groove 15 by bending the pawl part 17 toward an annular groove 15 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable cartridge type oil filter mounted on an internal combustion engine or the like.

[0002]

2. Description of the Related Art As shown in FIG. 13, a disposable oil filter mounted on an internal combustion engine has a cylindrical case 91 with a lid.
The filter body 95 is housed in a container composed of the bottom plate 92 and the bottom plate 92. The bottom plate 92 includes a thick disk 920 and a thick disk 920.
And a thin annular plate 925 that is spot-welded to the peripheral edge of the.

The thick disk 920 has a screw hole portion 921 serving as an oil discharge port in the central portion thereof and an oil introduction port 923 around the screw hole portion 921. On the other hand, the thin annular plate 925 is
A winding tightening portion 926 is formed on the peripheral portion, and an annular groove 927 for holding the packing 93 is provided inside the winding tightening portion 926. The packing 93 is an elastic body and seals the oil when the oil filter 90 is mounted on an internal combustion engine so that no gap is created between the two.

The annular groove 927 is packed in the packing 93.
It is slightly narrower than the
Insert by pressing. On the other hand, the case 91 and the bottom plate 92 are fixed by winding the fastening portion 926 and the opening end portion 911 of the case 91 together while enclosing the gasket 932 inside (so-called fastening fastening).

As a modification to the above structure, a method has been proposed in which the case and the bottom plate are joined by welding the opening end of the case and the thin annular plate without tightening them (actually 48). -51992 gazette). Also,
As another modified structure, a structure has been proposed in which the thick circular plate and the thin annular plate are integrated as one member (see Japanese Patent Laid-Open No. 52-32176).

[0006]

[Problems to be Solved] However, the conventional filter container of the oil filter has a complicated structure and a large number of manufacturing steps. That is, the bottom plate 92
Is composed of two members 920 and 925, which requires a manufacturing man-hour, and since the bottom plate 92 and the case 91 are fixed by winding, the shape structure of the member is complicated and man-hours for processing and assembling are required.

Further, the elastic structure of the annular packing 93 is used to press and fix the large annular packing 93 into the annular groove 927, but since the elastic coefficient cannot be made too small in order to seal oil well, the assembling work is performed. Is not easy either. In view of such conventional problems, the present invention aims to provide an inexpensive oil filter with a simple structure.

[0008]

A first invention of the present application is an oil filter in which a tubular filter is housed in a container.
A cylindrical case with a lid covering the filter, a bottom plate made of a single member having an oil inlet / outlet bored and attached to the bottom of the case, and an outer side of the oil inlet / outlet attached to the lower surface of the bottom plate The bottom plate is formed with an annular groove into which the annular packing is fitted. The bottom plate and the case are fixed to each other by closely welding their peripheries. The oil filter is characterized by

What is most noticeable in the present invention is that the bottom plate constituting the container is made of a single member, and the bottom plate and the case are fixed to each other by closely welding their peripheries. In the above, a single member is not composed of a plurality of parts.

Further, as a method of closely welding the bottom plate and the periphery of the case, there are laser welding, seam welding, electron beam welding and the like. The welding surface between the bottom plate and the case may be formed in a cylindrical ring shape along the cylindrical surface of the case, or may be formed in a brim shape perpendicular to the cylindrical surface of the case.

The latter flange-shaped welded surface projects from the outer surface of the cylinder and thus expands the outer diameter of the container, whereas the former cylindrical ring-shaped welded surface does not expand the outer diameter of the container and therefore the oil filter is smaller. (See comparison between FIG. 1 and FIG. 11). When the cylindrical ring-shaped welding surface is adopted, it is preferable to form a constricted portion (recess) above the welded portion of the case and bring the upper end surface of the bottom plate into contact therewith for locking. . This is because by locking the bottom plate with the constricted portion, the case and the bottom plate can be easily positioned, and the assembling and welding work of the both can be facilitated.

On the other hand, the second invention of the present application is an oil filter in which a cylindrical filter is housed in a container, wherein the container is
A cylindrical case with a lid covering the filter, a bottom plate made of a single member having an oil inlet / outlet bored and attached to the bottom of the case, and an outer side of the oil inlet / outlet attached to the lower surface of the bottom plate The bottom plate is formed with an annular groove into which the annular packing is fitted, and a plurality of claw portions are formed on the outer peripheral side or the inner peripheral side of the annular groove. In the oil filter, which is provided so as to project, the annular packing is locked in the annular groove by bending the claw portion toward the annular groove.

What is most noticeable in the second invention is that
The bottom plate of the container is formed by a single member, and a plurality of claws are projected on the edge of the annular groove into which the annular packing is fitted. That is, it is locked in the annular groove by bending to the groove side.

The above-mentioned structure in which a plurality of claws are provided on the edge of the annular groove and the annular packing is locked by the claws can be adopted in the oil filter of the first aspect of the invention. By doing so, in addition to the effect of the first invention described later, the work of assembling the annular packing is facilitated, and the machining tolerance of the annular groove can be reduced, so that the number of manufacturing steps can be further reduced. It is possible and preferable.

[0015]

[Operation and Effect] First, the operation and effect of the first invention will be described. In the oil filter according to the first aspect of the present invention, the bottom plate and the case are not integrated by winding and fixed but by welding. Further, the fixing work by welding is easy to automate and the number of steps can be reduced as compared with the assembling work by winding.

Further, the bottom plate having no fastening portion has a simple shape, and the bottom plate can be easily formed by a single member. Further, since the bottom plate is formed of a single member, the work of assembling or fixing the members between the members becomes unnecessary, and the number of manufacturing steps is reduced as a whole.

Further, since the annular packing is fitted and fitted in the annular groove, it can be fitted to the bottom plate as a post-process after welding the case and the bottom plate. Therefore, there is no risk that the annular packing will be altered or deformed by the heat generated by welding the case and the bottom plate.

Further, in the conventional method for fixing the case and the bottom plate by winding, it is necessary to interpose a gasket (reference numeral 93 in FIG. 13) in the winding portion in order to seal the oil. When welding the case and case, no gasket is required and the structure is simplified. As described above, according to the first invention of the present application, it is possible to provide an inexpensive oil filter with a simple structure.

Next, the function and effect of the second invention will be described.
In the oil filter according to the second aspect of the invention, the annular packing is locked in the annular groove by bending the claw portion. Therefore, it is not necessary to press-fit and hold the annular packing in the annular groove, and the annular groove may be made larger and the relative dimensional accuracy between the annular packing and the annular groove may be low. Therefore, the man-hours for processing the annular packing and the annular groove can be reduced.

Further, the annular packing can be easily fitted into the annular groove, and then the claw portion can be bent to be mounted in the annular groove very easily. As a result, the number of steps for assembling the annular packing into the annular groove can be reduced. On the other hand, since the bottom plate is formed of a single member, the assembly work between the members is unnecessary.

Further, since the bottom plate and the case are fixed by welding, the winding structure is unnecessary, and the shape of the bottom plate can be made simpler. As mentioned above, the second
According to the invention, an inexpensive oil filter can be provided with a simple structure.

[0022]

【Example】

Example 1 An oil filter according to an example of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In this example, as shown in FIG. 1, an oil filter 1 in which a tubular filter body 30 is housed in a container 10
Is. The container 10 includes a case 20 having a cylindrical shape with a cover covering the filter body 30, and oil inlet / outlet ports 41 and 42.
The bottom plate 11 is made of a single member and is attached to the bottom portion of the bottom plate 0.

The bottom plate 11 has an annular packing 2
An annular groove 15 into which the 5 is fitted is formed, and the bottom plate 11 and the case 20 are fixed to each other by closely welding their peripheries. In addition, a plurality of claws 17 are projectingly provided on the inner peripheral edge of the annular groove 15 of the bottom plate 11, and the annular packing 25 is formed by bending the claws 17 toward the annular groove 15 side. Is locked to.

A supplementary explanation will be given below for each of these. The case 20 is a tubular body made of a metal material such as iron and having a lid 201. The bottom plate 1 is attached to the lower end of the case 20.
A collar portion 202 for welding 1 is formed. Filter 30
Is fixed in the container 10 by being pressed by the pressing spring 31, and holds the filter paper 300 between the upper and lower end plates 301 and 302 and the reinforcing tube 32.

The reinforcing cylinder 32 has a small hole 321 for allowing oil to flow therethrough, and the oil flows as shown by the arrow in FIG. The bottom plate 11 is a thick disk-shaped single member,
As shown in FIG. 5, a large-diameter oil outlet 41 is provided at the center.
A plurality of oil inlets 42 are radially provided around the outlet 41.

And, on the inner wall of the oil intake 41,
As shown in FIG. 1, a screw portion 111 is formed, and the screw portion 111 is attached to the internal combustion engine by screwing. The oil filter 1 mounted on the internal combustion engine prevents the oil from leaking out by the annular packing 25 protruding from the bottom plate 11. An annular groove 15 is provided on the outer side of the oil outlet 42, and a plurality of claw portions 17 for holding the annular packing 25 are provided at substantially equal intervals (16) on the inner peripheral edge of the annular groove 15.
It is projected (Fig. 5).

Further, the case 2 is provided at the outermost edge of the bottom plate 11.
A flat pedestal portion 112 for welding the collar portion 201 of No. 0 is formed. The annular packing 25, as shown in FIG.
It is composed of a wide base 251 with one side protruding and a thick body 252. And the groove width at the back of the annular groove 15 is
It is set to a value considerably larger than the width of the base 251 of the annular packing 25.

Therefore, the annular packing 25 is replaced by the annular groove 15
Easy to insert into. The ring-shaped packing 25 inserted in the ring-shaped groove 15 is, as shown in FIG.
It is held in the annular groove 15 by bending 7 toward the annular groove 15 side and locking the base 251. Further, in FIG. 1, reference numeral 31 is a check valve.

Next, the manufacturing process of the bottom plate 11 will be described. First, the thick disk 110 having the shape shown in FIG. 2 is manufactured by general press working. After that, a punch (driving type) 61 and a die (receiving type) as shown by the chain line in FIG.
The concave portion 113 is formed by 62 and the claw portion 17
To form. The processing of the claw portion 17 is performed by a plurality of molds 61, 6
It is possible to perform the processing in a short time by simultaneously processing the entire circumference by using No. 2. In addition, after forming the claw portions 17 on the thick disk, general press working may be performed to a shape required for the bottom plate 11.

Next, the claw portion 17 is bent toward the annular groove 15 side,
A processing step of holding the annular packing 25 will be described. As for the claw portion 17, the claw portion 17 (FIG. 3) which is upright as shown by the chain line in FIG. 4 is bent toward the annular groove 15 side by a method such as pressing or spinning caulking as shown in FIG.
In FIG. 7, reference numeral 64 is a press die, and reference numeral 65 is a press stand. Then, as shown in FIG. 7, the tip 1 of the claw portion 17
71 is located inside the groove with respect to the inner peripheral end 253 of the base 251.

At this time, the tip 171 of the claw portion 17 is
It is preferable not to contact the inner peripheral surface 254 of the body 252. The reason is that the annular packing 25 can move in the annular groove 15 relatively easily.

Next, the welding process of the bottom plate 11 and the case 20 will be described. The bottom plate 11 and the case 20 are joined by laser welding, and this joining operation is carried out before mounting the annular packing 25, as shown in FIG. That is, as shown in FIG. 6, the bottom plate 11 is set on the jig 63, and then the flange portion 2 of the case 20 is used by using the pressure welding jig 631.
02 is pressed against the pedestal portion 112 of the bottom plate 11, and the whole is rotated together with the jig 63 as indicated by the arrow to laser-weld the collar portion 202 and the pedestal portion 112 over the entire circumference one after another. In the case of this example, laser welding was performed at a welding speed of 40 mm / sec, an output of 570 W, and an assist gas amount of 20 l / min.

Next, the function and effect of the oil filter 1 of this embodiment will be described. Oil filter 1 configured as described above
As shown in FIG.
1, the reverse flow prevention valve 31 is pushed open to flow into the case 20, and rises between the inner peripheral surface of the case 20 and the outer peripheral surface of the filter body 30. Then, the oil is purified by passing through the filter body 30 in the radial direction, and the purified oil is supplied to the small holes 3 of the reinforcing cylinder 32.
It is returned to the internal combustion engine from the outlet 42 through 21.

In the oil filter 1 of this example, the case 20 and the bottom plate 11 are joined by laser welding. Therefore, unlike the conventional oil filter, the bottom plate 11 does not have a complicated shape such as a winding tightening portion (reference numerals 926 and 911 in FIG. 13), and a gasket (FIG. No members such as 93) are required.
As a result, the bottom plate 11 has a simple shape and can be formed of a single member, and as a result, the number of manufacturing steps is reduced.

Further, the joining of the case 20 and the bottom plate 11 by laser welding can be easily automated and the number of steps can be reduced as compared with the assembling method by winding. In addition, the annular packing 25 has the annular groove 1 by the claw portion 17.
Since it is locked by 5, it is easier to assemble as compared with the conventional holding method of press-fitting and holding in the annular groove.

Further, since it is firmly locked by the claw portion 17, it is more difficult to disengage from the annular groove 15 than in the conventional case.
When replacing the oil filter 1, the annular packing 25 does not come off from the whole and stick to the internal combustion engine side. As described above, according to this example, it is possible to provide an inexpensive oil filter 1 with a simple structure.

Example 2 In this example, as shown in FIG. 8 and FIG.
This is another embodiment in which the shapes and processing methods of the annular groove 16 and the claw portion 18 are changed. The annular groove 16 of this example is formed in the bottom plate 12 by pressing. Therefore, the bottom plate 1
As shown in FIG. 9, a convex portion 121 corresponding to the annular groove 16 is formed on the upper portion of 2. At this stage, the claw 1
8 is not formed.

Then, the annular packing 25 is placed in the annular groove 16.
As shown in FIG. 9, in this state, an acute angle jig 66 is driven in the vicinity of the inner peripheral wall of the annular groove 16 to form an inclined claw portion 18 in the annular groove 16, and the annular packing 25 is attached to the annular groove 25. Lock in 16. For others,
This is the same as in the first embodiment.

Embodiment 3 As shown in FIG. 10, this embodiment is another embodiment in which the claw portion 19 of the bottom plate 13 is formed on the outer peripheral wall side of the annular groove 16 in the embodiment 2. That is, as shown in FIG. 10, the jig 67 is driven near the outer peripheral wall of the annular groove 16 to form the claw portion 19. On the other hand, the annular packing 26 has a base portion 261 protruding toward the outer peripheral wall side of the annular groove 16,
The protrusion 262 of the base 261 is locked by the claw 19. Others are the same as in the second embodiment.

Fourth Embodiment In this embodiment, as shown in FIGS. 11 and 12, in the first embodiment, the welded portion 60 between the bottom plate 14 and the case 21 is the case 21.
It is formed so as to go around the cylindrical surface of
It is another embodiment in which a constricted portion 211 for engagement with which the upper end surface 141 of the bottom plate 14 abuts is formed above the welded portion 60.

The welded portion 60 is formed along the cylindrical surface of the case 21. Therefore, unlike the first embodiment, the collar portion 202 and the pedestal 112 (FIG. 1) protruding vertically from the cylindrical surface are unnecessary. In addition, the maximum outer diameter D of the oil filter 1 is larger than that of the conventional oil filter 9 (FIG. 13) having a tightening portion.
Becomes smaller. Therefore, the maximum outer diameter D of the oil filter 1 can be made smaller than the maximum outer diameter of the oil filter 1 of the first to third embodiments and the conventional oil filter, and the entire oil filter can be made smaller. You can

Further, since the case 21 is provided with the constricted portion 211, the bottom plate 14 does not come into contact with the constricted portion 211 and dig into the inner portion of the case 21. Therefore, there is no displacement between the bottom plate 14 and the case 21 during laser welding, and both the bottom plate 14 and the case 21 can be accurately positioned.
Can be joined. In addition, in this example, as shown in FIG.
1, As shown in FIG. 12, the oil intake port 420 is not parallel to the axial center but is slightly inclined. Others are the same as those in the first embodiment.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil filter according to a first embodiment.

FIG. 2 is a cross-sectional view of a thick disc for forming a bottom plate of Example 1.

FIG. 3 is an explanatory diagram of a process of forming a claw portion on the bottom plate of the first embodiment.

FIG. 4 is an enlarged view of the locking portion of the annular packing in the oil filter of the first embodiment.

5 is a bottom view of the oil filter of FIG.

FIG. 6 is an explanatory view of a process of joining the case and the bottom plate of the oil filter of the first embodiment.

FIG. 7 is an explanatory diagram of a locking process of the annular packing according to the first embodiment.

FIG. 8 is a sectional view of an oil filter according to a second embodiment.

FIG. 9 is an explanatory view of a process of forming a claw portion of the oil filter and a locking process of the annular packing according to the second embodiment.

FIG. 10 is an explanatory diagram of a process of forming a claw portion and a locking process of the annular packing of the oil filter according to the third embodiment.

FIG. 11 is a sectional view of an oil filter according to a fourth embodiment.

FIG. 12 is a bottom view of the oil filter according to the fourth embodiment.

FIG. 13 is a sectional view of a conventional oil filter.

[Explanation of symbols]

 1. ． ． Oil filter, 10. ． ． Container, 11-14. ． ． Bottom plate, 15, 16. ． ． Annular groove, 17-19. ． ． Claws, 20, 21. ． ． Case, 25, 26. ． ． Annular packing, 30. ． ． Filter body,

Continuation of the front page (72) Inventor Kaku Naito 1-1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (4)

[Claims] 1. An oil filter in which a tubular filter body is housed in a container, wherein the container is a tubular case with a lid covering the filter body, and an oil inlet / outlet is bored at the bottom of the case. It has a bottom plate composed of a single member to be mounted, and an annular packing that is mounted on the lower surface of the bottom plate and goes around the outside of the oil inlet / outlet. The bottom plate has an annular groove into which the annular packing is fitted. The oil filter is formed, and the bottom plate and the case are fixed to each other by closely welding their peripheries. 2. The welding portion between the bottom plate and the case according to claim 1, wherein the welding portion is formed so as to go around the cylindrical surface of the case, and the upper end surface of the bottom plate is provided above the welding portion of the case. An oil filter, characterized in that a constricted constriction portion is formed which abuts against. 3. An oil filter in which a tubular filter body is housed in a container, wherein the container has a cylindrical case with a lid covering the filter body, and an oil inlet / outlet is formed in a bottom portion of the case. It has a bottom plate composed of a single member to be mounted, and an annular packing that is mounted on the lower surface of the bottom plate and goes around the outside of the oil inlet / outlet. The bottom plate has an annular groove into which the annular packing is fitted. A plurality of claws are formed on the outer peripheral side or the inner peripheral side of the annular groove so as to project, and the annular packing is formed by bending the claws toward the annular groove. An oil filter characterized by being locked in a groove. 4. The claw portion according to claim 1 or 2, wherein a plurality of claw portions are provided on an edge portion of the annular groove of the bottom plate on an outer peripheral side or an inner peripheral side, and the annular packing has the claw portion. An oil filter, wherein the oil filter is locked in the annular groove by being bent toward the annular groove.