JPH09150022A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep high filtration precision without causing a trouble in sealability of a filter for a long time of use. SOLUTION: A filter is provided with a screen 1 produced by folding a mesh made of a resin in two and welding the overlapped sides, a protector 2 installed in the screen 1 to keep the expanded state of the screen 1, a cap 4 which communicates the inside and the outside of the screen 1 and has a flow path having an opened outlet 7 for a liquid in the outside of the screen 1, and a cover 6 which is so installed as to cover the outside of the screen 1 and has an opened inlet 5 for a liquid in the bottom face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tank type filter arranged in an oil pan or a fuel tank of an automobile or the like.

[0002]

2. Description of the Related Art As a filter (oil strainer) used for removing dust from torque converter oil of an automatic transmission of an automobile, a filter as shown in FIG. 17 is conventionally known.

This filter includes a plate 100, a cover 101 provided on one side of the plate 100, and a screen 102 made of stainless steel or the like which is sandwiched between the plate 100 and the cover 101 and caulked around the entire circumference.
And a bolt 10 for attaching the plate 100, the screen 102, and the cover 101 to a unit (not shown).
3

However, the filter shown in FIG. 17 has the following problems. That is, recently, although it has been desired to improve the filtering accuracy of the filter, it is difficult to increase the filtering area (area where the screen is stretched) due to the structure.

A filter proposed to solve the problem of the filter of FIG. 17 is disclosed in Japanese Utility Model Publication 7-7650.

As shown in FIG. 18, this filter has a lower case 105 having an oil inlet 104, an upper case 107 having an oil outlet 106, and upper and lower cases 10.
Felt-like filter medium 108 fixed in 7, 105
And a correction member 109 that is placed in the filter medium 108 to widen the internal gap of the filter medium 108.

An opening 110 is formed in the filter medium 108, and the opening 110 is formed in the oil inlet 1 of the lower case 105.
It connects to 04 and attaches. The filter medium 108 is obtained by folding a single sheet in two, and the three sides that are overlapped are sandwiched and fixed to the peripheral edge between the upper case 107 and the lower case 105.

According to this, since the filtering material 108 is formed in a bag shape, the filtering area can be increased. By the way, in order to improve the filtration accuracy, it is necessary to reduce the filtration flow particle size. Therefore, as in the filter of FIG. 17 described above, if the filtration area is small, the life will be significantly reduced due to clogging. On the other hand, this Figure 1
According to the filter of No. 8, since the filtration area can be expanded, the life can be improved.

[0009]

However, FIG.
In the oil filter of (1), the filter medium 108 is formed by folding a single sheet in two and sandwiching the three sides overlapped with each other at the peripheral edge between the upper case 107 and the lower case 105 to be fixed. Therefore, if the caulked portions of the upper case 107 and the lower case 105 become loose due to long-term use, the sandwiched portion of the filter medium 108 may become loose, and the overlapped portion of the filter medium 108 may not be sealed. . Therefore, the oil before filtration enters the bag of the filter medium 108, which causes deterioration of filtration accuracy.

It is an object of the present invention to provide a filter which can maintain good filtration accuracy without impairing the sealing property of the filter medium even after long-term use.

[0011]

In order to achieve the above object, the present invention is constructed as follows.

(1) The filter according to claim 1 is a screen formed by folding a resin mesh in two and welding the overlapped sides to form a bag, and a swelled state of the screen disposed in the screen. A protector that holds
A cap having a flow path communicating the inside and the outside of the screen and having an outlet for the liquid opened to the outside of the screen; and a cover formed to cover the outside of the screen and formed with an inlet for the liquid opened on the bottom surface. ing.

According to the filter of the first aspect, since the screen is formed by sealing the mesh by welding, the bag of the screen does not break even after long-term use. It is common to all the claims that the screen is formed by welding the mesh in this way.

Further, in the filter according to the first aspect of the present invention, the inlet portion of the flow path of the screen and the cap is covered with the cover, and the liquid inlet is opened at the bottom surface of the cover. Therefore, even if a part of the filter surface is exposed from the liquid when the liquid level is lowered or the automobile or the like makes a sharp turn, the air is not sucked. Further, the liquid does not remain in the gap between the screen and the inner surface of the cover, the liquid film does not form on the surface of the screen, and the screen does not dry. Therefore, inhalation of air is also prevented from this point.

(2) A filter according to a second aspect is a screen formed by folding a sheet of resin mesh into two and welding the two left and right overlapping sides to form a bag shape with one end open. An opening of the screen provided between the protector which is put in the bag-shaped screen and holds the bulging state of the screen, the projection annularly arranged on the protector side and the receiving portion formed inside the projection. A cap having a gap into which an edge is inserted, a flow path that communicates the inside and outside of the screen and has a liquid outlet opened to the outside of the screen, and a flange formed on the outer periphery, and a cap that can be fitted to the outer periphery of the cap A fitting port, a claw formed on the periphery of the fitting port so as to be engageable with the flange of the cap, and a cover provided with a liquid inlet formed by opening on the bottom surface. Have.

The filter according to claim 2 is manufactured as follows. That is, the opening edge of the bag-shaped screen is inserted into the gap between the projection of the cap and the receiving portion inside the cap, and then the cover is fitted to the cap so that the claw of the cover is engaged with the flange of the cap and The projection of the cap is pushed down by the inner surface of and the opening edge of the screen is pressed between the projection and the receiving part.

(3) In the case of the filter of claim 3, the claw is
A taper is formed on the engagement surface with the flange.

According to the third aspect of the filter, when the cover is fitted into the cap, the cover holds a part of the flange of the cap to hold the screen,
The cover claws prevent the cover from coming off.

(4) In the filter according to the fourth aspect, the seal portion provided between the cap and the cover has a taper formed on one of the inner surface of the cap and the outer surface of the cover.

According to the filter of the fourth aspect, since the seal portion is tapered, the cover is press-fitted into the cap, and the sealing property is improved.

(5) In the case of the filter of claim 5, the claw is
The entire circumference is divided into a plurality of parts.

According to the filter of the fifth aspect, when the cover is fitted to the cap, the claw easily engages with the flange.

(6) In the case of the filter according to claim 6, the inner surface of the cover is formed with a taper portion on a surface which abuts the protrusion when the cover is fitted to the cap.

According to the filter of the sixth aspect, when the cover is fitted on the cap, the projection of the cap is easily brought down by the tapered surface of the cover.

(7) In the case of the filter of claim 7, the cap is provided with a snap structure which can be press-fitted into the set hole of the unit to be fitted therein.

(8) In the filter according to the eighth aspect, the snap structure of the cap has slits formed in the vertical direction.

According to the filter of the eighth aspect, since elasticity is imparted to the cap by the slit, the force for holding the cap press-fitted in the cap hole is increased.

(9) In the case of the filter according to claim 9, the liquid outlet portion of the cap is formed in a substantially cylindrical shape so that the mounting port of the fuel pump can be press-fitted therein.

(10) A filter according to a tenth aspect is a screen formed by folding a sheet of resin mesh in two and welding the three sides overlapped to form a closed bag shape and forming a cap hole. And a protector which is arranged in the screen and holds the expanded state of the screen, a flow path which communicates the inside and outside of the screen with the liquid outlet opening to the outside of the screen, and an annular set hole for the unit on the outer peripheral part And a cap having a screen support portion that sandwiches a portion near the cap hole of the screen between the inner peripheral portion and the inner peripheral portion.

According to the eleventh aspect of the filter, the screen is sandwiched and fixed between the screen supporting portion of the cap and the setting hole of the unit.

That is, at the same time when the filter is attached to the unit, the portion near the cap hole of the screen is sealed.

(11) In the filter of claim 11, a gap is formed below the screen support portion.

According to the filter of the eleventh aspect, since the screen supporting portion is made to have elasticity by the gap in the lower surface of the screen supporting portion, the force for holding the screen is further increased.

(12) In the filter according to the twelfth aspect of the present invention, the screen support portion sandwiches the portion near the cap hole of the screen between the screen support portion and the pressing portion formed on the inner periphery of the unit setting hole with a square cross section. Thus, a tapered surface is formed on the outer circumference.

That is, the screen is fixed with a stronger holding force by the very strong pressure contact force acting between the taper surface on the cap side and the pressing portion on the unit side.

(13) In the case of the filter according to claim 13, the cap has a snap structure which can be press-fitted into the set hole of the unit to be fitted therein.

(14) In the case of the filter according to claim 14, the snap structure of the cap has slits formed in the vertical direction.

(15) In the filter according to the fifteenth aspect, the liquid outlet portion of the cap is formed into a substantially cylindrical shape so that the mounting port of the fuel pump can be press-fitted therein.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment (Inventions of Claims 1 to 8)
Embodiment ) FIG. 1 shows an embodiment of the filter according to claims 1 and 2. In the present embodiment, as the filter, an oil strainer immersed in the torque converter oil of the automatic transmission is taken as an example.

This filter has a screen 1 formed in the shape of a bag from a single resin mesh, and a protector 2 arranged in the screen 1 and a flow path 3 communicating the inside and outside of the screen 1. A cap 4 and a cover 6 that covers the outside of the screen 1 and that has a liquid (oil) inlet 5 opened on the bottom surface are provided.

Here, the screen 1 is formed of a mesh made of synthetic resin such as PPS. That is, one sheet of, for example, a quadrangular resin mesh is folded in two, and the left and right overlapped two sides are welded by, for example, ultrasonic waves to form a bag shape with one end open. The hatched portion in FIG. 1A is the welded portion 1S. As described above, since the screen 1 of the present invention is formed by sealing the mesh by welding, the bag does not break even after long-term use. As the welding means, ultrasonic welding is used in this embodiment, but the invention is not limited to this.
Appropriate welding means other than electric welding can be used.

In this embodiment, the cap 4 is formed integrally with the protector 2 arranged in the screen 1 and the portion having the oil outlet 7 on the outside of the screen 1 (either integrally formed or It is provided by combining a plurality of parts). The protector 2 is provided to hold the swelled state of the bag-shaped screen 1. The protector 2 of this embodiment comprises a plurality of portions extending side by side from the cap 4.

As shown in FIGS. 4 and 5, the portion of the cap 4 supporting the protector 2 includes a projection 8 arranged annularly on the protector 2 side and a receiving portion 9 formed inside the projection 8. A gap 10 having a substantially V-shaped cross section is provided therebetween. As shown in FIG. 5, the protrusions 8 are provided with slits 11 at intervals so that they can be easily tilted.

The channel 3 of the cap 4 is shown in FIGS.
(B) As shown in FIG. 4, the inside and outside of the screen 1 are communicated with each other, and the oil outlet 7 is opened outside the screen 1. The outlet 7 of this embodiment is formed facing upward.

A flange 13 is formed on the outer periphery of the cap 4, and the claw 14 of the cover 6 is engaged when the cover 6 is fitted into the cap 4, as shown in FIG.

As shown in FIGS. 2 and 6 to 8, the cover 6 has a fitting port 12 formed therein so that it can be fitted to the cap 4. The screen 1 and the cap 4 are provided so as to cover the inlet 15 portion of the flow path 3 and an oil inlet 5 is formed on the bottom surface. Therefore, suction of air is prevented.

As shown in FIGS. 2 and 7, the claw 14 provided on the cover 6 has a slight taper on the engaging surface 16 (the surface that engages with the flange 13) at the tip. This claw 14
Due to the taper, the cover 6 presses a part of the flange 13 of the cap 4 to hold the screen 1, and the claws 14 of the cover 6 prevent the cover 6 from coming off.

A seal portion 17 is provided between the cover 6 and the cap 4, as shown in FIG. This seal part 1
At 7, a taper is formed on one of the outer surface of the cap 4 and the inner surface of the cover 6. By forming the taper in the seal portion 17 in this manner, the cover 6 is press-fitted into the cap 4, and the sealing property is improved.

The claws 14 of the cover 6 are, as shown in FIG.
The entire circumference is divided into a plurality of parts. Therefore, the pawl 14 is easily engaged with the flange 13.

The inner surface of the cover 6 is, as shown in FIG.
A taper portion 18 is formed on the surface that abuts the projection 8 when the cap 4 is fitted. Therefore, when fitting the cover 6 to the cap 4, the projection 8 is easily tilted by the tapered portion 18.

The filter of this embodiment is assembled as follows (see FIGS. 2 and 10). The opening edge of the bag-shaped screen 1 is inserted into the gap 10 between the protrusion 8 of the cap 4 and the receiving portion 9 inside thereof, and then the cover 6 is fitted into the cap 4 so that the claw 14 of the cover 6 is attached to the cap 4. The taper portion 1 of the cover 6 is engaged with the flange 13.
The projection 8 of the cap 4 is pushed down by 8 to press the screen 1 between the projection 8 and the receiving portion 9.

In this embodiment, as shown in FIGS. 4 and 10, the protrusion 8 is formed with an upward angle θ.
Therefore, the screen 1 can be easily inserted, and the screen 1 can be pressed with a strong force while being covered with the cover 6 and the protrusion 8 is tilted.

The cap 4 is provided with a snap structure on the outer periphery of the outlet 7 portion projecting to the outside of the screen 1.
As shown in (B), the unit 19 can be press-fitted into the set hole 20 and fitted. The snap structure of the present embodiment includes an umbrella portion 21 that is tapered on the outer circumference of the tip portion, and a circumferential groove 22 that is formed in a concave shape on the lower outer circumference of the umbrella portion 21. The outlet 7 of the cap 4 held by the unit 19
A pipe (not shown) is connected to, and an oil pump (not shown) is connected through this pipe.

In the snap structure of the cap 4, a slit 23 is formed in the vertical direction in this embodiment. Since the slit 23 gives elasticity to the cap 4, the force for holding the cap 4 press-fitted into the unit 19 is increased.

According to the filter constructed as described above, oil is filtered as follows.

By driving an oil pump (not shown), oil is sucked up by the oil pump through the inlet 5 of the cover 6, the screen 1, the inlet 15 of the cap 4, the outlet 7 of the cap 4, and the piping. Where the oil is screen 1
Dust in the oil is removed as it passes through.

In the filter, the inlet 15 portion of the flow path 3 of the screen 1 and the cap 4 is covered with the cover 6, and the oil inlet 5 is opened on the bottom surface of the cover 6. Therefore, when the liquid level of the oil is lowered, or when an automobile or the like makes a sharp turn, even if a part of the filter surface is exposed from the oil, the air is not sucked. In addition, since liquid remains in the gap between the screen 1 and the inner surface of the cover 6 and the liquid film does not dry on the surface of the screen 1, the air is prevented from being sucked in from this point as well.

Second embodiment (fills of claims 10 to 14)
Embodiment of Data Filter) FIG. 11 shows another embodiment of the filter of the present invention.
Also in this embodiment, the oil strainer immersed in the torque converter oil of the automatic transmission is taken as an example.

This filter comprises a screen 1 and a cap 4 provided with a protector 2 and a flow path 3.

The present embodiment is largely different from the above-mentioned embodiments in that the cover is not provided and the structure is simplified.

The screen 1 of the present embodiment is formed into a closed bag shape by welding, for example, ultrasonic waves on three sides of a sheet of, for example, a square resin mesh, which is folded in two and overlapped, and has a cap hole. 24 is formed by punching. The cap hole 24 is formed to allow the cap 4 to pass through, as shown in FIG. A portion of the screen 1 near the cap hole 24 is sandwiched between the screen support portion 25 formed on the outer periphery of the cap 4 and the inner periphery of the set hole 20 of the unit 19 when the cap 4 is attached to the unit 19. Get caught. That is, the filter is attached to the unit 19 and at the same time, the portion near the cap hole 24 of the screen 1 is sealed.

The screen support portion 25 is, in this embodiment,
A gap 26 is formed below. Since the screen support portion 25 has elasticity by the gap 26, the force for holding the screen 1 is further increased.

On the other hand, the set hole 20 of the unit 19 has a fitting convex portion 27 formed on the inner circumference thereof, and is fitted into the circumferential groove 22 of the cap 4 to hold the cap 4. Further, the pressing portion 29 is formed in a square cross section, and the screen 1
Is pressed with a strong force. That is, the screen support portion 25 of this embodiment has the tapered surface 3 on the outer periphery.
0 is formed, and the portion near the cap hole 24 of the screen 1 is sandwiched between the unit 19 and the pressing portion 29 having a square cross section with a strong force.

The point that the cap 4 is provided with the snap structure and the point that the vertical slit 23 is formed in the snap structure is the same as in the above-described embodiment.

The protector 2 of this embodiment has a different structure from that of the above-mentioned embodiments. That is, the protector 2 of the present embodiment is formed in a flat pipe shape, and the inside thereof serves as the flow path 31. The starting end of this flow path 31 is opened as an oil inlet 32. The flow path 3 of the cap 4 communicates with the end of the flow path 31. Therefore, the oil filtered by the screen 1 flows in the path of the inlet 32 of the protector 2 → the flow passage 31 of the protector → the flow passage 3 of the cap 4 → the outlet 7 of the cap 4.

This flat protector 2 is shown in FIGS.
2, as shown in FIG.
Is provided. A horizontal plate 34 is provided so as to extend on the left and right sides, and the horizontal plate 34 is also provided with a plurality of protrusions 33. The reason for providing the horizontal plate 34 extending to the left and right in this way is to further increase the area of the screen 1. The projecting portion 33 is for preventing the screen 1 from coming into close contact with the protector 2.

Modifications The present invention is not limited to the embodiments described above, and various modifications can be implemented.

(1) For example, although the oil strainer is exemplified as the filter in the above-mentioned embodiments, the present invention is not limited to this, and the present invention can be applied to a filter used by being immersed in a gasoline tank or any other liquid.

In this connection, although the cap 4 is formed so as to be attachable to the unit 19 in the above-mentioned embodiment, the present invention is not limited to this, and as shown in FIG. 14, the fuel pump 3
The tubular portion 37 into which the tubular mounting port 36 (suction port) of 5 can be press-fitted
May be formed. In the illustrated example, the protrusion 38 extending downward of the fuel pump 35 is inserted into the engaging hole formed in the protrusion 39 on the cap 4 side for positioning (claims 9 and 15).
Filter example).

(2) Further, in the filter of the type in which the opening edge of the screen 1 is sandwiched between the cap 4 and the cover 6 (for example, the first embodiment), before the cover 6 is fitted into the cap 4. , It is necessary to hold the screen 1 down.

As a means for holding the opening edge of the screen 1, first, as shown in FIG. 15 (A), the screen 1 is placed outside the cap 4 (or inside the cover) and fixed by welding or adhesion. Alternatively, some of them may be pressed by another pressing part (not shown).

In addition, as shown in FIGS. 15 (B) and 15 (C), there is one in which the screen 1 is inserted into the gap 10 formed in the cap 4. In this case, if the gap 10 is larger than the thickness of the screen 1, the screen 1 may come off. To solve this problem, the gap 1
The size of 0 may be made smaller than the thickness of the screen 1, or may be pressed by another pressing component (not shown).

Further, as in the first embodiment described above,
After inserting the screen 1 into the gap 10 of the cap 4,
It is most desirable to apply an external force by the cover 6 because the screen 1 can be pressed down with a strong force.

(3) The filter is an oil strainer, and there is the following structure for attaching it to the unit.

For example, in the structure shown in FIGS. 16A and 16B, the elasticity of the protrusion 40 forming the fitting portion of the cap 4 presses against the unit 19 to form a seal portion. In particular, in the example of FIG. 16B, a seal member 41 made of an elastic material is interposed between the protrusion 40 and the unit 19 to further improve the sealing property.

Further, such a protrusion 40 and the unit 19
The structure in which the screen 1 is inserted in the seal portion between is shown in FIG.
(C) (D) (E). FIG. 16 (E)
It is the structure of the second embodiment described above.

[0078]

According to the filter of the present invention described above, the following effects can be obtained.

(1) According to the filter of claim 1, since the screen is formed by sealing the mesh by welding, the bag of the screen will not be broken even if it is used for a long time, and the life of the filter can be extended. it can.

Further, in this filter, the inlet portion of the flow path of the screen and the cap is covered with the cover, and the inlet of the liquid is opened on the bottom surface of the cover. Therefore, even if a part of the filter surface is exposed from the liquid, it is possible to prevent inhalation of air.

(2) In the filter according to claim 2, the opening edge of the bag-shaped screen is inserted into the gap between the projection of the cap and the receiving portion inside thereof, and then the cover is fitted into the cap, and the claw of the cover is fitted. Is engaged with the flange of the cap, and the inner surface of the cover causes the projection of the cap to fall so that the opening edge of the screen is pressed between the projection and the receiving portion for assembly. Therefore, it is easily assembled.

(3) In the case of the filter of claim 3, the engaging surface of the pawl with the flange is tapered. Therefore, by pressing a part of the flange of the cap with the cover, the screen can be held and the cover can be prevented from coming off with the claw.

(4) In the case of the filter according to claim 4, the seal portion provided between the cap and the cover is tapered. Therefore, the cover is pressed into the cap, and the sealing property is improved.

(5) In the case of the filter according to claim 5, the claws of the cover are formed by being divided into a plurality of parts. Therefore,
When the cover is fitted to the cap, the claw easily engages with the flange.

(6) In the case of the filter according to claim 6, a taper portion is formed on the surface of the inner surface of the cover which abuts the projection of the cap. Therefore, since the projection of the cap is easily tilted by this tapered portion, the cover can be easily fitted to the cap.

(7) In the case of the filter according to claim 7, there is provided a snap structure capable of press-fitting the cap into the set hole of the unit for fitting. Therefore, it can be attached with one touch.

(8) In the case of the filter of claim 8, the snap structure of the cap has slits formed in the vertical direction. That is, since elasticity is given to the cap by the slit, the force for holding the cap press-fitted in the cap hole is increased.

(9) In the case of the filter according to the ninth aspect, since the liquid outlet portion of the cap is formed in a substantially cylindrical shape, it can be connected to the mounting port of the fuel pump.

(10) A filter according to a tenth aspect is a screen formed by folding a sheet of resin mesh in two and welding the overlapped three sides to form a closed bag and having a cap hole. A protector that is placed inside the screen to keep the screen in a swollen state, a flow path that opens a liquid outlet to the outside of the screen through a cap hole of the screen, and a ring-shaped unit set hole on the outer periphery. And a cap having a screen support portion that sandwiches a portion near the cap hole of the screen between the inner peripheral portion and the inner peripheral portion.

In the filter according to the tenth aspect, the portion near the cap hole of the screen is sandwiched and fixed between the screen support portion of the cap and the cap hole of the unit.

That is, the screen can be sealed at the same time when the filter is attached to the unit.

(11) In the case of the eleventh aspect of the invention, a gap is formed below the screen supporting portion. Since the screen supporting portion has elasticity, the force for holding the screen is further increased.

(12) In the case of the filter of claim 12, the portion near the cap hole of the screen is sandwiched between the taper portion of the screen support portion of the cap and the pressing portion formed in the unit in a square cross section. It has become. Therefore, the screen is fixed with a stronger holding force.

(13) In the filter according to claim 13, the cap is provided with a snap structure. Therefore,
Can be attached to the unit with one touch.

(14) In the filter according to the fourteenth aspect, a slit is formed in the snap structure. That is, the slits can impart elasticity to the cap and increase the force for holding the cap press-fitted into the cap hole.

(15) In the case of the filter according to the fifteenth aspect, since the liquid outlet portion of the cap is formed in a substantially cylindrical shape, it can be connected to the mounting port of the fuel pump.

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of a filter of the present invention, (A) is a plan view and (B) is a side view.

FIG. 2 is a vertical cross-sectional view taken along the line AA of the filter of FIG. 1A.

3 is a diagram showing a cap of the filter of FIG.
(A) is a plan view, (B) is a vertical cross-sectional view taken along line BB of FIG.
(C) is a view seen from the rear.

FIG. 4 is an enlarged view of a portion surrounded by C in FIG. 1B.

FIG. 5 is an enlarged view of a portion surrounded by D in FIG. 1C.

6 is a view showing a cover of the filter of FIG. 1,
(A) is a plan view and (B) is a side view.

FIG. 7 is a cross-sectional view taken along the line EE of FIG. 6A.

8 is a partially enlarged view of the front surface of the cover of FIG.

9 is a perspective view of a portion of the cover of FIG.

10 is a sectional view showing a state immediately before the cap of FIG. 4 and the cover of FIG. 7 are fitted together.

11A and 11B are overall views of another embodiment of the filter of the present invention, in which FIG. 11A is a cross-sectional view in the lateral direction (cross-sectional view taken along the line GG in FIG. 11B), and FIG. It is sectional drawing of the FF line of FIG. 11A).

12 is a perspective view showing a cap and a protector portion of the filter of FIG. 11. FIG.

FIG. 13 is an enlarged vertical sectional view showing a state where the filter of FIG. 11 is attached to a unit.

FIG. 14 is a schematic view showing an example in which the filter of the present invention is applied to mount a fuel pump.

FIG. 15 is a view showing a means for pressing the screen onto the cap, FIG. 15A is an explanatory view of a case where the screen is pressed by welding,
(B) and (C) are explanatory views when a screen is inserted in the gap.

FIG. 16 is a diagram showing a state where the cap is attached to the unit, (A) and (B) showing a state in which the unit is fitted to the cap, and (C), (D) and (E) showing a state where the screen is sandwiched. It is a figure.

FIG. 17 is a schematic view showing an example of a conventional filter.

FIG. 18 is a vertical cross-sectional view showing another example of a conventional filter.

[Explanation of symbols]

 1 Screen 2 Protector 3 Flow Path 4 Cap 5 Cover Liquid Inlet 6 Cover 7 Cap Liquid Outlet 8 Protrusion 9 Receiving Part 10 Gap 12 Cover Fitting Port 13 Flange 14 Claw 15 Cap Inlet 16 Engaging Surface 17 Sealing Part 18 Tapered part 19 Unit 20 Set hole 21 Umbrella part 22 Circumferential groove 23 Slit 24 Cap hole 25 Screen support part 26 Gap 29 Pressed part 30 Tapered surface 35 Fuel pump 36 Mounting port 37 Cylindrical part

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[Procedure amendment]

[Submission date] March 6, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (15)

[Claims] 1. A screen formed by folding a resin mesh in two and welding the overlapped sides to form a bag, a protector arranged in the screen for holding the expanded state of the screen, and a screen The screen is provided with a cap having a flow path that communicates the inside and the outside and has a liquid outlet opened to the outside of the screen, and a cover that is provided to cover the outside of the screen and has a liquid inlet opened at the bottom surface. A filter characterized by that. 2. A screen formed by folding a single resin mesh into two and welding the two left and right overlapped sides to form a bag shape with one end open, and a bag-shaped screen A protector that is inserted and holds the bulging state of the screen, a protrusion that is annularly arranged on the protector side, and a gap that is inserted between the opening edge of the screen and the receiving portion formed inside the protrusion, and the screen A flow path that communicates the inside and outside and has an outlet for the liquid opened to the outside of the screen, a cap having a flange formed on the outer circumference, and a fitting port formed so that it can be fitted to the outer circumference of the cap,
The cover is provided with a claw formed on the periphery of the fitting port so as to be engageable with the flange of the cap, and a liquid inlet formed by opening on the bottom surface. filter. 3. The filter according to claim 2, wherein the claw has a tapered engagement surface with the flange. 4. A seal portion provided between the cap and the cover, wherein a taper is formed on one of an outer surface of the cap and an inner surface of the cover.
The listed filters. 5. The filter according to claim 2, wherein the claw is divided into a plurality of parts along the entire circumference. 6. The filter according to claim 2, wherein the cover has a taper portion formed on a surface that abuts the protrusion when the cover is fitted to the cap. 7. The oil filter according to claim 1, wherein the cap is provided with a snap structure that can be press-fitted into a set hole of the unit to be fitted therein. 8. The snap structure of the cap has slits formed in a vertical direction.
Or the oil filter described in 2. 9. The oil filter according to claim 1, wherein the liquid outlet portion of the cap is formed in a substantially cylindrical shape so that the mounting port of the fuel pump can be press-fitted therein. 10. A screen formed by folding a sheet of resin mesh into two and welding the three sides that are overlapped to each other to form a closed bag shape and forming a cap hole, and a screen disposed in the screen. The protector that keeps the screen in a swollen state, and the flow path that opens the liquid outlet to the outside of the screen through the cap hole of the screen,
A filter having a screen support portion that is formed in an annular shape on the outer peripheral portion and has an inner peripheral portion of the set hole of the unit, and a screen support portion that sandwiches a portion near the cap hole of the screen. 11. The oil filter according to claim 11, wherein a gap is formed below the screen support portion. 12. The screen support portion has a tapered surface on the outer periphery so as to sandwich a portion near the cap hole of the screen between the pressing portion formed on the inner periphery of the set hole of the unit and having a square cross section. The filter according to claim 11, wherein the filter is formed. 13. The filter according to claim 10, wherein the cap is provided with a snap structure that can be press-fitted into a set hole of the unit to be fitted therein. 14. The filter according to claim 14, wherein the snap structure of the cap has a slit formed in a vertical direction. 15. The liquid outlet portion of the cap is
The filter according to claim 10 or 11, wherein the mounting port of the fuel pump is formed into a substantially cylindrical shape so that the mounting port can be press-fitted.