JP2000117015A - Filter device of fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be simple in the consistuion, to integrally form a member replacing a spring to a fuel filter and to enable a filter device to be simply attached to a specified position. SOLUTION: A cylindrical part 21 for housing a filter frame 43 is disposed on the bottom of a fuel tank 13 and a flange 41 of the filter frame 43 is engaged to a conical stepped part 18 formed in the midway of the cylindrical part 21. An elastic member 50 is integrally formed from a synthetic resin to the flange 41 of the filter frame 43 and the tip of the elastic member 50 is abutted on the inner surface of a cap 15 for closing the cylindrical part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for an oil heater or the like, and more particularly to a fuel tank filter device which facilitates replacement of a fuel filter.

[0002]

2. Description of the Related Art In a conventional fuel supply device such as an oil heater, a horizontal cylindrical portion for housing a fuel filter is provided at the bottom of a fuel tank, and the fuel filter is sandwiched between a lid of the cylindrical portion and the fuel filter. It is pushed into the cylindrical part by the force of the spring.

[0003] In the above configuration, the spring and the fuel filter are separated from each other. Therefore, those who are not accustomed to replacing the fuel filter may lose the spring or replace the spring when replacing the fuel filter. May not be assembled to hit the end of the fuel filter. In such a case, the flange of the fuel filter is not engaged with the conical step portion of the cylindrical portion, and a gap is generated, so that an oil flow that does not pass through the fuel filter occurs, and foreign matters contained in the oil are removed by the inflow valve. To the valve, which may lead to valve leakage.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the object of the present invention is to provide a simple structure, wherein an elastic member instead of a spring is formed integrally with a filter frame so that it can be easily mounted at a predetermined position. To provide a filter device for a fuel tank.

[0005]

In order to solve the above-mentioned problems, according to the present invention, there is provided a cylindrical portion for accommodating a filter frame at the bottom of a fuel tank, and a conical step formed in the middle of the cylindrical portion. In a filter device for a fuel tank in which a flange of a filter frame is engaged, an elastic member is formed of synthetic resin integrally with a flange of the filter frame, and a tip of the elastic member is provided on an inner surface of a lid for closing the cylindrical portion. Is abutted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the spring is eliminated and the shape of the filter frame is changed. That is, an elastic member instead of a spring is molded from synthetic resin integrally with the filter frame. With this configuration, replacement of the fuel filter is facilitated, and poor pressing of the spring is avoided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a fuel tank 13 has a cylindrical portion 21 for storing a fuel filter 42 at the bottom.
Is opened to the upper part of the fuel tank 13 via a vertical passage 9a. An upper lid 4 is connected to an upper end of the fuel tank 13 by a plurality of bolts 5. The taker 2 for pushing down the float 23 is attached to the upper cover 4, and a suction pipe of a fuel pump (not shown) for taking out the fuel passes through the opening 3 of the upper cover 4 to the inner peripheral portion 23 a of the horseshoe-shaped float 23. Protruded. A pair of upper and lower levers 27a, 27 is supported by the support shaft 26 on the side wall 9 having the passage 9a so as to be tiltable. The lever 27 is formed integrally with the base end of the horseshoe-shaped float 23. Bifurcated lever 27a and plate-shaped lever 27
The lower end of the valve body 28 of the inflow valve 30 is locked, and the inflow valve 30 is opened and closed by swinging of the lever 27, so that the oil level of the fuel tank 13 is maintained substantially constant.

The valve body 28 is fitted into the valve chamber 29a of the cylindrical portion 29 of the assembly 34 so as to be able to move up and down, and opens and closes a valve hole 31 at the upper end of the cylindrical portion 29. The valve hole 31 is communicated with the passage 9 a through a passage 33 in a lateral direction of the cylindrical portion 32. The valve body 28 is provided with a groove in the axial direction on the peripheral surface of the cylindrical body to form a fuel passage between the valve body 29a and the valve chamber 29a. The assembly 34 is fitted with a plug 6 made of a ball at the end of the passage 33. The assembly 34 is formed integrally with a cylindrical portion 7 extending downward on the lower wall portion of the cylindrical portion 32, and the cylindrical portion 7 is formed at the upper end of the passage 19 and is sealed to a cylindrical portion having a larger diameter than the passage 9 a. 8 and fixed by an adhesive.

When the oil level in the fuel tank 13 becomes low, the float 23
Rotates counterclockwise about the support shaft 26. At this time, the conical portion at the upper end of the valve body 28 is separated from the valve hole 31.
Therefore, fuel is supplied from the fuel pump (not shown) to the inlet 2.
4, fuel filter 42, passage 9a, passage 33, valve hole 31
, And flows into the chamber 35 of the fuel tank 13. When the oil level of the fuel tank 13 reaches a predetermined height, the float 23 rotates clockwise about the support shaft 26, the valve body 28 is pushed up, and the valve hole 31 is closed.

The fuel filter 42 has a basket-shaped filter frame 43.
The filter body 44 made of felt or the like is housed inside the filter frame 43, and the flange 41 of the filter frame 43 is pressed against the conical step 18 of the cylindrical portion 21 by the force of the elastic member 50. The elastic member 50 is formed integrally with the flange 41 of the filter frame 43, and has a distal end via the seal plate 16.
Is pressed against the lid 15 that closes. The lid 15 is fixed to the fuel tank 13 by a plurality of bolts 14.

As shown in FIG. 2, according to the present invention, a plurality of leg pieces 52 as an elastic member 50 are formed integrally with the flange 41 of the filter frame 43 molded from synthetic resin.
The leg piece 52 plays the role of a spring. That is, the elastic member 50
A plurality of leg pieces 52 are formed integrally with the flange 41 of the filter frame 43, and the end 52a of each leg piece 52 is curved outward. When the fuel filter 42 is replaced,
The filter frame 43 is pushed into the cylindrical portion 21 and the sealing plate 16
Together with the lid 15 against the wall of the fuel tank 13 and fix it with bolts 14. At this time, when the end portion 52a of the leg piece 52 is pushed rightward by the seal plate 16, the leg piece 52 is curved in an arc shape and exerts an elastic force on the flange 41. The portion 18 is smoothly engaged. The flange 41 is not inclined or eccentric with respect to the step 18, and the flange 41 is
As a result, all the fuel flowing from the inlet 24 to the passage 9a passes through the fuel filter 42, and completely prevents foreign substances contained in the fuel from flowing to the inlet valve 30 through the chamber 35.

In the embodiment shown in FIG. 3, a spiral resin piece 5 as an elastic member 50 is provided on a flange 41 of a filter frame 43.
3 is formed integrally.

Although not shown, a bellows is formed integrally with the flange 41 instead of the leg piece 52, or the bellows is connected to the flange 41 by an adhesive or the like, and the tip of the bellows is pressed against the seal plate 16. It may be contracted to exert elastic force on the flange 41 so that the flange 41 is smoothly engaged with the conical stepped portion 18.

In the present invention, since the elastic member 50 is formed integrally with the flange 41, when replacing the fuel filter,
It is possible to solve the problem that the spring is lost or the flange of the filter frame is engaged with the step portion while being tilted due to the one-sided contact of the spring, thereby impairing the function of the fuel filter.

[0015]

According to the present invention, as described above, a cylindrical portion for accommodating the filter frame is provided at the bottom of the fuel tank, and the flange of the filter frame is engaged with a conical step formed in the middle of the cylindrical portion. In the fuel tank filter device as described above, an elastic member is formed of synthetic resin integrally with the flange of the filter frame,
Since the tip of the elastic member abuts against the inner surface of the lid that closes the cylindrical portion, it is possible to prevent malfunction of the fuel filter due to forgetting to assemble the elastic member when replacing the fuel filter. Stable and easy to assemble.

By eliminating the conventional metal spring, it is possible to reduce the weight and the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a fuel tank provided with a filter device according to the present invention.

FIG. 2 is a side sectional view of a filter device of the fuel tank.

FIG. 3 is a side sectional view of a fuel tank filter device according to a second embodiment of the present invention.

[Explanation of symbols]

2: Takekura 3: Opening 4: Upper lid 5: Bolt 6:
Plug 7: Cylindrical part 8: Seal member 9: Side wall part 9a:
Passage 13: Fuel tank 14: Bolt 15: Lid 16: Seal plate 18: Conical step 19: Leg 2
1: cylindrical part 23: float 23a: inner peripheral part 24: inlet 26: support shaft 27: lever 27a: lever 28: valve body 29: cylindrical part 29
a: Valve chamber 30: Inflow valve 31: Valve hole 32: Cylindrical part
33: Passage 34: Assembly 35: Chamber 41: Flange 42: Fuel Filter 43: Filter Frame 44: Filter 50: Elastic Member 52: Leg 53: Spiral Resin

Claims (3)

[Claims] 1. A filter device for a fuel tank, wherein a cylindrical portion for accommodating a filter frame is provided at the bottom of the fuel tank, and a flange of the filter frame is engaged with a conical step formed in the middle of the cylindrical portion. 2. The filter device for a fuel tank according to claim 1, wherein the elastic member is formed of synthetic resin integrally with the flange of the filter frame, and the tip of the elastic member abuts on the inner surface of the lid closing the cylindrical portion. 2. The fuel according to claim 1, wherein the elastic member is formed by curving the distal ends of a plurality of leg pieces extending in the axial direction at intervals in the circumferential direction from the flange of the filter frame. Tank filter device. 3. The filter device for a fuel tank according to claim 1, wherein the elastic member is a resin piece spirally extending from a flange of the filter frame.