JP2974897B2 - filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter, and more particularly to a filter in which a cylindrical filter medium is accommodated in a cup-shaped case.

[0002]

2. Description of the Related Art Hitherto, a filter disclosed in Japanese Utility Model Publication No. 3-46812 has been known as this type of filter. FIG.
In FIG. 0, a short columnar convex portion 2 is formed at the bottom of the cylindrical cup 1, and a coil spring (elastic support) 3 is disposed at an outer peripheral position of the convex portion 2. A filter medium 4 in the form of a cylindrical cup with a bottom is accommodated in the cup 1 from the bottom side, placed on the coil spring 3, and pushed up elastically in the opening direction. A lid 5 having an inflow port and an outflow port is attached to the opening of the cup 1, covers the opening, and connects the inflow port to the outer peripheral surface side of the filter medium 4.
Connect the cylindrical extension pipe 6 communicating with the outlet with the filter medium 4
And the outlet is communicated with the inner peripheral surface side of the filter medium 4.

When assembling, first, the coil spring 3 is placed at an outer peripheral position of the convex portion 2 formed on the bottom of the cup 1. After placing the coil spring 3, put the filter medium 4 into the cup 1
And the cover 5 covers the opening of the cup 1 with the extension pipe 6 entering the center of the filter medium 4. At this time, the filter medium 4 is pushed up by the coil spring 3 and pressed against the lid 5.

[0004]

In the above-mentioned conventional filter, it is necessary to work while paying attention so that the coil spring 3 does not shift during the operation, and there is a problem that the assembling is troublesome. If the inner diameter of the coil spring 3 is made smaller than that of the outer circumference of the projection 2, the coil spring 3 must be engaged with the outer circumference of the projection 2 while expanding one end of the coil spring 3 during assembly. In addition, workability deteriorates.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a filter which can easily accommodate an elastic support in a cup.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 is directed to a cylindrical case member having a bottom, a cylindrical filter medium accommodated in the case member, and a filter medium. An elastic support disposed between the bottom wall of the case member and the filter member for pressing the filter medium toward the open end of the case member. An engagement portion that abuts and engages so as to push against the filter member, and a filter material support arm that urges the filter material toward the opening end of the case member separately from the arm having the engagement portion. .

According to a second aspect of the present invention, there is provided a bottomed cylindrical case member, a cylindrical filter medium accommodated in the case member, and a space between the filter medium and a bottom wall of the case member. An elastic support for pressing the filter medium toward the opening end of the case member, wherein the elastic support is disposed between the filter medium and the inner peripheral wall surface of the case member. And a filter medium supporting arm for urging the filter medium to the open end side of the case member separately from the arm having the engagement section. is there. Furthermore, the invention according to claim 3 is provided with a bottomed cylindrical case member, a cylindrical filter medium housed in the case member, and a filter member disposed between the filter medium and a bottom wall of the case member. A filter provided with an elastic support for pressing the filter medium toward the open end of the case member, wherein the elastic support is formed by forming a polygonal portion having an inner peripheral surface on the bottom wall side of the case member. An engagement portion is provided which abuts and engages with a flat portion formed on the inner peripheral wall surface of the case member so as to be pushed and spread. Furthermore, the invention according to claim 4 is characterized in that a bottomed cylindrical case member, a cylindrical filter medium accommodated in the case member, and a filter member and a bottom wall of the case member are disposed between the case member and the bottom wall of the case member. An elastic support for pressing the filter medium toward the open end of the case member, wherein the elastic support is bent inward with respect to the case member and inserted into the inner peripheral wall surface of the case member. And an engagement portion that abuts and engages so as to push and spread.

[0008]

According to the first aspect of the present invention, when the elastic support is inserted into the case member, the engaging portion abuts on the inner peripheral wall surface of the case member and bends, and the inner peripheral wall surface is bent. Engage by spreading. Further, the filter medium supporting arm is formed separately from the arm having the engaging portion, and can elastically support the cylindrical filter medium.

Further, in the invention according to claim 2 configured as described above, the portion of the engaging portion which is in contact with the inner peripheral wall surface of the case member is located between the filter medium and the inner peripheral wall surface of the case member. The filter medium is inserted into the inner side of the case member. Further, the filter medium supporting arm is formed separately from the arm having the engaging portion, and can elastically support the cylindrical filter medium. Further, in the invention according to claim 3 configured as described above, since the engaging portion abuts against the flat portion on the inner peripheral wall surface of the polygonal portion of the case member, the rotation of the elastic support member is achieved. Can be prevented. Further, in the invention according to claim 4 configured as described above, when the elastic support is inserted into the case member, the elastic support is inserted by bending the engaging portion inward, and the elastic support is resilient. The inner peripheral wall surface of the case member is pressed and stretched by the force, and the elastic support does not fall off the case member.

[0010]

As described above, according to the present invention, the elastic support can be held in the cup member by simply pushing it in, the workability of assembling is improved, and the elastic support can be replaced even when the filter medium is replaced. Is less likely to fall off, making replacement work easier. Further, since the arm having the engaging portion and the filter medium support arm are separate from each other, the effectiveness of the elastic support of the filter medium is improved. Further, according to the second aspect of the present invention, since the filter medium can be inserted into the back of the case member, the space can be effectively used and the size can be reduced. Further, since the contact member is disposed between the filter medium and the inner peripheral wall surface, it is possible to suppress the radial movement of the filter medium. Furthermore, according to the third aspect of the present invention, since the engaging portion is in close contact with the plane portion of the polygonal inner peripheral surface, the force for rotating the elastic support itself is applied. This can also prevent this. Furthermore, according to the fourth aspect of the present invention, when the elastic support is pushed into the case member, the engaging portion itself comes into contact with the inner peripheral surface of the case member with a resilient force. Can be retained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a replaceable oil filter of an automobile to which the filter according to one embodiment of the present invention is applied. In FIG. 1, a spring (elastic support) 20 made of a leaf spring and a cartridge-type filter medium 30 are accommodated in a cup-shaped casing 10 having a bottom, and the open end of the casing 10 is set on a set plate 40. The set plate 40 is fixed to the opening of the casing 10 with a ring-shaped fastener 50. The open end of the cylindrical casing 10 forms a large-diameter portion 12 slightly larger in diameter than the body portion 11, and the peripheral wall has a crank-shaped cross section. Engagement projections 13 projecting toward the opening direction are formed at three places at an end of the large diameter portion 12 at equal intervals. A partition member 14 having an annular band plate is welded and fixed from the vicinity of the boundary between the large diameter portion 12 and the body portion 11 on the inner peripheral surface of the casing 10 toward the opening end. Protrusions 14a at six locations at even intervals
And the notch 14b. The protrusion 14a
Is made to coincide with the end face of the large diameter portion 12.
Further, the bottom side of the casing 10 forms a polygonal portion 15 formed in a polygonal shape.

The spring 20 is formed by cutting a spring-like plate material into a predetermined shape. As shown in FIGS. 2 and 3, six arms are provided extending at equal intervals in the radial direction around the base 21, and three long peripheral wall contact arms 22 are provided. The three filter medium support arms 23 are formed alternately. Longer peripheral wall contact arm 2
Reference numeral 2 denotes an angle at which the outer end 22a is curved by about 110 degrees so that the end 22a pushes the inner periphery of the casing 10 when inserted into the casing 10. A positioning protrusion 22a1 raised in a ridge shape is formed on the inner peripheral surface side of the same end 22a, and the inner diameter surrounded by each positioning protrusion 22a1 when the spring 20 is inserted into the casing 10 is a filter medium. 30 is slightly larger than the outer diameter. In addition,
If the material of the spring 20 is too hard, play is likely to occur, so the spring 20 is made somewhat softer.

On the other hand, the filter medium support arm 23 is
0, and is obliquely bent in the same direction as the bending direction of the peripheral wall contact arm 22. The filter medium 30 is formed by folding the filter paper into a fold and making the whole cylindrical.
A ring-shaped end face is covered, and a relief valve 31 that fits in one of the openings is disposed in one of the openings to close the opening. However, the relief valve 31 is disposed deep inside the opening, and a hole 32 is formed in the opening. The disk-shaped set plate 40 is used for the large-diameter portion 12.
A male screw is formed on the outer periphery with a slightly larger diameter than that, and cutouts 41 into which the engaging projections 13 of the casing 10 can enter are formed at three places on the peripheral wall. The center of the set plate 40 is raised toward the inner surface of the casing 10, and the filter medium 3
An outlet 42 which can be inserted into the opening at one end at 0 and has an inner peripheral wall as a female screw is formed, and a plurality of inlets 43 are formed around the outlet 42.

The ring-shaped fastener 50 has an L-shaped cross section in which one end of a cylinder is curved toward the center, and the cylindrical portion allows the large-diameter portion 12 of the casing 10 to penetrate therethrough.
With respect to the narrow-diameter portion 51 curved toward the center, the trunk portion 11 can penetrate, but the large-diameter portion 12 cannot penetrate. A female screw 52 is formed on the inner peripheral surface of the cylindrical portion. Next, an assembling method of the present embodiment having the above configuration will be described. The partition member 14 is welded and fixed to the inner periphery of the casing 10 so that the notch 14b formed at the end of the partition member 14 overlaps with the engagement projection 13 of the casing 10, and the large-diameter portion 12 and the projection of the partition member 14 are formed. 14a
The O-ring 60 is housed in an annular groove formed between the O-ring 60 and the O-ring 60.

After the O-ring 60 is stored, the leaf spring 20 is inserted through the opening of the casing 10. Since the end 22 a of the peripheral wall contact arm 22 has an angle of about 110 degrees, the spring 20 is pushed into the casing 10 while bending the peripheral wall contact arm 22 inward. The spring 20 is held substantially at the center of the casing 10 because the peripheral wall contact arm 22 bends evenly as it is pushed in. On the other hand, since each peripheral wall contact arm 22 presses the end 22 a against the inner peripheral surface of the casing 10, the spring 20 does not fall off the casing 10. In addition, as shown in FIG. 5, the end 22a is in close contact with and engages with a flat portion of the inner peripheral surface of the polygonal portion 15 to prevent rotation. As a result, although it is worn when it rotates, it can be prevented from slipping and falling because the rotation can be prevented to prevent abrasion.

Thereafter, the filter medium 30 is inserted into the casing 10 from the side of the relief valve 31. The inner diameter surrounded by the positioning projection 22a1 formed on the end 22a of the peripheral wall contact arm 22 has the same size. Filter media 30
Is slightly larger than the outer shape of the
0 is hooked and stops. However, when a small force is applied and pushed in, the positioning projection 22a1 and the end 22a made of an elastic member bend toward the outer peripheral side to expand the inner diameter, so that the filter medium 30 can be inserted inside. At this time, the filter medium 30 is provided with the three-sided positioning projections 22a1 evenly arranged.
Is bent, and is positioned substantially at the center. That is, the filter can be positioned at a regular position only by pushing the filter medium 30.

On the other hand, the filter medium support arm 23 smaller than the inner diameter of the casing 10 is bent obliquely toward the opening side of the casing 10, and one end face of the filter medium 30 pushed in as described above is supported by the filter medium support arm 23. It comes into contact with the tip of the arm 23. Spring media support arm 23
Can be bent toward the back of the casing 10, so that the filter medium 30 is elastically supported by the filter medium support arm 23. Next, set plate 4
The notch 41 formed on the outer periphery of the casing 0 and the engaging protrusion 13 of the casing 10 are aligned, and the opening of the casing 10 is covered with the set plate 40 so that the engaging protrusion 13 enters the notch 41. When the set plate 40 is attached, the filter medium support arm 2 of the spring 20
3, the filter medium 30 is pushed into the inside of the casing 10, and the opening 42 of the filter medium 30 comes into contact with the periphery of the outlet 42. Here, an elastic seal member is provided at the opening of the filter medium 30 so as to be in close contact therewith. Thereby, the casing 10
The space surrounded by the set plate 40 and the
The filter paper 30 is isolated between the inside of the filter medium 30 that communicates with the outside through the filter and the outside of the filter medium 30 that communicates with the outside through the inflow port 43. Is arranged. Since a drain-back valve is formed in the hole 32 of the filter medium 30, the valve opens when a predetermined pressure or more is applied, and the outlet 42 and the inlet 43 communicate with each other.

Further, the casing 1 is
When the 0 opening is covered, the O-ring 60 is brought into contact with the O-ring 60 housed in the large diameter portion 12 to be deformed and sealed. next,
As shown in FIG. 4, the casing 10 is inserted from the side of the body 11 to the side of the ring-shaped fastener 50 opposite to the narrow-diameter portion 51. When the fastener 50 is rotated, a male screw formed around the set plate 40 and a female screw 52 formed on the inner peripheral surface of the fastener 50 are screwed together. When both screws are screwed together, the set plate 40 becomes the narrow diameter portion 5 of the fastener 50.
It is drawn to the side of 1. Set plate 40 and fastener 5
The large-diameter part 12 of the casing 10 is narrowed between the small-diameter part 51 at 0 and the large-diameter part 12 cannot penetrate the small-diameter part 51, so the set plate 40 is It will be pressed and held against the opening side of the part 12.

The set plate 40 cannot be rotated with respect to the casing 10 by the engagement between the notch 41 and the engagement projection 13, and cannot be moved in the opening direction by screwing with the fastener 50. Because the casing 1
By rotating 0, the set plate 40 rotates without idling and can be attached to and detached from the cylindrical male screw on the mounting surface. After the removal, the set plate 40 can be removed from the casing 10 by rotating the fastener 50, and only the filter medium 30 can be replaced or inspected. FIG. 6 shows another embodiment of the present invention. In this embodiment, the positioning projection 22a1 formed on the end 22a of the peripheral wall contact arm 22 is not provided. Instead, the hole 32 on the side of the filter medium 30 provided with the relief valve 31 in the center of the base 21 is provided. The projection 24 for positioning, which can be inserted into the device, is raised.

Also in this embodiment, the peripheral wall contact arm 22
The spring 20 is pushed into the inside of the casing 10 while bending, and the filter medium 30 is inserted from the side of the relief valve 31 as shown in FIG. Filter media 3
When 0 is inserted at the center, the positioning projection 24 enters the hole 32 on the side of the relief valve 31 and can be further pushed in, and the set plate 40 can be mounted. However, if the filter medium 30 is off center, the projections 24
Cannot come into contact with the periphery of the hole 32 and cannot be pushed.
Then, the opening of the casing 10 cannot be covered with the set plate 40, and it can be confirmed that the position is shifted.

As described above, the peripheral wall contact arm 22 is
The spring 20 is inserted into the casing 10 by bending the peripheral wall contact arm 22 by forming the spring 20 so as to extend in the radial direction from 1. At this time, the end portion 22a of the peripheral wall contact arm 22 comes into contact with the inner peripheral wall of the casing 10 so as to push the inner peripheral wall, so that it can be prevented from falling off freely. Further, the filter medium support arm 23 extending in the radial direction between the peripheral wall contact arms 22 has
And is elastically supported in contact with the end face of the filter medium 30. FIG. 8 shows another embodiment of the present invention. In the present embodiment, the filter medium supporting arm 23 is not provided, and instead, the base 21 is curved so as to expand toward the opening side of the casing 10.

In such a configuration, the peripheral wall contact arm 22
When the spring 20 is pushed into the interior of the casing 10 while bending, the peripheral wall contact arm 22 tries to push and expand the inner peripheral wall, so that the spring 20 itself engages inside the casing 10 and does not fall off. On the other hand, when the filter medium 30 is pushed in this state, the filter medium 30 pushes and bends the base 21 at the center of the spring 20 as shown in FIG. It bends and curves so as to wrap around the filter medium 30. As a result, the filter medium 30 is held at the center position. In the above-described embodiment, the plate-shaped spring 20 is used, but it is formed by a coil spring, and one end has a small diameter in contact with the filter medium 30, and the other end has a large diameter. It is also possible to configure so that the peripheral wall is spread.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a replaceable oil filter of an automobile to which a filter according to one embodiment of the present invention is applied.

FIG. 2 is a plan view of a spring.

FIG. 3 is a sectional view taken along line III-III of the spring in FIG. 2;

FIG. 4 is an exploded perspective view of the oil filter.

FIG. 5 is a sectional view showing an engagement state between a spring and a casing.

FIG. 6 is a plan view of a spring according to another embodiment.

FIG. 7 is a sectional view of a spring and a filter medium showing a positioning state.

FIG. 8 is a cross-sectional view showing a mounted state of a spring according to another embodiment.

FIG. 9 is a sectional view showing a positioning state.

FIG. 10 is a sectional view of a conventional oil filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Casing 20 ... Spring 21 ... Base part 22 ... Peripheral wall contact arm 22a ... End part 22a1 ... Positioning protrusion 23 ... Filter medium support arm 24 ... Positioning convex part 30 ... Filter filter medium

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiichi Terada 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ ▼ Inside Machine Manufacturing Co., Ltd. (72) Inventor Hiroaki Yamashita 7800 Nakase Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ Machine Manufacturing Co., Ltd. (72) Inventor Hiroshi Morikawa 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo Machinery Co., Ltd. Examiner Kenichi Mori (56) Reference JP-A-63-197507 (JP, A) −55775 (JP, U) Actually open 1979-55774 (JP, U) Actually open Hei 2 37205 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01D 27/08 B01D 35/02

Claims (4)

(57) [Claims] A bottomed cylindrical case member, a cylindrical filter medium accommodated in the case member, and a filter member disposed between the filter medium and a bottom wall of the case member, wherein the filter medium is provided in the case member. An elastic support that presses against the open end of the member, wherein the elastic support is pressed against the inner peripheral wall surface of the case member so as to abut and engage therewith; A filter comprising: an arm having a joining portion; and a filter medium supporting arm for urging the filter medium toward an opening end of the case member. 2. A case member having a bottomed cylindrical shape, a cylindrical filter medium accommodated in the case member, and a filter member disposed between the filter medium and a bottom wall of the case member, and the filter medium is provided in the case. A filter having an elastic support pressed against the opening end side of the member, wherein the elastic support is pressed between the filter medium and the inner peripheral wall of the case member so as to be spread toward the inner peripheral wall. A filter comprising: an engaging portion that is in contact with and engaged with; and a filter medium supporting arm that urges the filter medium toward an open end of the case member, separately from an arm having the engaging section. 3. A case member having a bottomed cylindrical shape, a cylindrical filter medium accommodated in the case member, and the filter medium disposed between the filter medium and a bottom wall of the case member, and provided with the same case. An elastic support that presses against the open end side of the member, wherein a polygonal portion whose inner peripheral surface is polygonal is formed on the bottom wall side of the case member, and the elastic support is formed of the case member. A filter comprising: an engaging portion that abuts and engages with a flat portion formed on an inner peripheral wall surface so as to be pushed and spread. 4. A case member having a bottomed cylindrical shape, a cylindrical filter medium housed in the case member, and the filter medium disposed between the filter medium and a bottom wall of the case member, and the filter medium is provided in the case. A filter provided with an elastic support pressed against the opening end side of the member, wherein the elastic support is flexed inward with respect to the case member and inserted to expand the inner peripheral wall surface of the case member. Characterized in that the filter has an engaging portion that abuts and engages as described above.