JPH059493Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fuel pump filter device installed in a fuel tank, and in particular, the lower surface side of the filter comes into frictional contact with the bottom surface of the fuel tank, causing wear. The present invention relates to a filter device for a fuel pump that can prevent such problems.

[Prior art]

3 and 4 show a prior art filter device for a fuel pump.

In the figure, reference numeral 1 indicates a fuel tank mounted on a four-wheel drive vehicle, etc., and the fuel tank 1 has an inclined surface 1A and a flat bottom surface in order to make effective use of the tank storage space provided inside the vehicle. Side 1
B is provided. Reference numeral 2 indicates a fuel pump provided in the fuel tank 1, and the fuel pump 2 is positioned by a bracket (not shown) or the like while being immersed in the fuel in the fuel tank 1. A suction port 2A is provided on the lower surface side of the fuel pump 2, and the fuel pump 2 is configured to pump and supply fuel sucked in from the suction port 2A to an injection valve (not shown) or the like outside the fuel tank 1. It's summery.

3 indicates a filter device disposed on the lower surface side of the fuel pump 2; 4 indicates the body of the filter device 3;
The body 4 is formed of a resin material such as polyacetal into a substantially dogleg-shaped bent tube, and an elliptical filter mounting flange 4A with a filter holding portion _4A1 formed on the outer circumferential side is provided in the middle part of the body 4. There is. Here, the body 4 is provided with a connection port 4B connected to the suction port 2A on one side with the filter attachment flange 4A in between, and a suction port 4C opening downward on the other side. A fixing part 4D is formed on one side of the body 4 and protrudes in the radial direction and is located on the outer peripheral side of the connection port 4B.
The fuel pump 2 is fixed to the bottom surface of the fuel pump 2 by caulking or the like in a state where the fuel pump 2 is fitted into the fuel pump 2. Further, on the other side of the body 4, there are provided a pair of protrusions 4E, 4E located on the outer peripheral side of the suction port 4C and facing each other in the diametrical direction. The mounting portion 6B is fitted and fixed.

5 covers the suction port 4C of the body 4,
A bag-shaped filter is shown fixed to the filter mounting flange 4A of the body 4, and the filter 5 is made of fibers made of a resin material such as nylon 6.
It is formed into a cylindrical shape by knitting it in a mesh shape with a mesh diameter of about 70 μm, and its tip end 5A is closed using means such as ultrasonic welding after the spring 6 is attached. Before the spring 6 is attached, the base end 5B of the filter 5 is held in the filter holding part _4A1 of the filter mounting flange 4A over the entire circumference, and is fixed to the filter mounting flange 4A. ing.
Here, the lower surface side of the filter 5 is pressed onto the inclined surface 1A by a spring 6 or the like so that the tip side 5A extends toward the flat surface 1B side of the bottom surface of the fuel tank 1. The filter 5 removes dust and the like from the fuel in the fuel tank 1 while sucking the fuel all the way into the fuel pump 2 through the suction port 4C and the like.

Further, reference numeral 6 denotes a filter expansion spring disposed within the filter 5 to expand the filter 5 upward and downward, and the spring 6 has spring properties. For example, it is formed by bending a steel wire such as SUS304 as shown in FIG. 4, and the distal end thereof is a connecting portion 6A bent in a substantially U-shape. The base end side of the spring 6 becomes attachment portions 6B, 6B spaced apart from each other in the left-right direction, and each attachment portion 6B is fitted and fixed to each protrusion 4E of the body 4. Further, the middle part of the spring 6 is inclined downward along the inclined surface 1A of the fuel tank 1, and the lower surface side of the filter 5 is pressed onto the inclined surface 1A by the respective parts 6C, 6D, etc. There is.

Here, the spring 6 holds the filter 5 in the expanded state as shown in FIG. 3 by bringing the connecting portion 6A and each portion 6C, 6D into contact with the upper and lower surfaces of the filter 5, and fuel When the pump 2 sucks fuel, the pressure difference generated between the inside and outside of the filter 5 prevents the filter 5 from shrinking in the direction of arrow A in FIG. 3.
Further, the spring 6 is designed to prevent the filter 5 from being greatly expanded or contracted in the direction of arrow B.

The conventional technology has the above-mentioned configuration, and when the fuel pump 2 is operated, the fuel in the fuel tank 1 is sucked into the fuel pump 2 from the suction port 4C of the body 4 via the filter 5, and the fuel is It is supplied under pressure to an injection valve or the like outside the tank 1. The filter 5 is expanded by the spring 6 as shown in FIG.
Even when the remaining amount of fuel is low, this fuel can be reliably sucked into the fuel pump 2 through the suction port 4C.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional technology, since the lower surface side of the filter 5 is constantly pressed onto the inclined surface 1A of the fuel tank 1 by the parts 6C, 6D of the spring 6, etc., When the filter 5 and the fuel tank 1 undergo relative displacement,
The bottom side of the filter 5 is each part 6 of the spring 6.
Portions corresponding to C, 6D, etc. come into strong frictional contact with the inclined surface 1A of the fuel tank 1.

Further, although the filter 5 is held in the expanded state by the spring 6, the filter 5 may be expanded or contracted in the direction of arrow B in FIG. 3 due to the suction pressure from the fuel pump 2. The lower surface of the filter 5 is strongly rubbed between the inclined surface 1A of the fuel tank 1 and each portion 6C, 6D of the spring 6.

For this reason, in the prior art, the lower surface side of the filter 5 receives concentrated loads from the parts 6C, 6D of the spring 6, etc., and may be partially worn out, and if the filter 5 is damaged due to this wear, the fuel F
There is a drawback that it becomes difficult to remove dust and the like inside.

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The present invention is capable of suppressing the partial concentrated load applied to the lower surface of the filter by the spring, thereby preventing damage due to wear. The present invention provides a filter device for a fuel pump.

[Means for solving problems]

The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that the spring for expanding the filter has a part bent at a portion extending toward the lower surface of the filter and facing in the left-right direction. The left and right roller support portions formed by this method are integrally provided, and a resin roller for pressing the lower surface side of the filter against the bottom surface of the fuel tank is rotatably attached to each roller support portion.

[Function] With the above configuration, the resin roller can be rotatably supported by each roller support portion that is formed integrally with the spring for expanding the filter in the left and right direction, and the resin roller connects the bottom side of the filter with the fuel tank. The contact area with the bottom surface can be expanded. When the filter expands or contracts even slightly in the length direction (front-back direction) of the filter due to suction pressure from the fuel pump, etc., a resin roller extending in the left-right direction between each roller support portion of the spring is rotated. Since the lower surface side of the filter moves in the front-rear direction, it is possible to prevent the lower surface side of the filter from being partially subjected to a concentrated load between the spring and the bottom surface of the fuel tank and being rubbed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, the same components as those of the prior art shown in FIG.

In the figure, reference numeral 11 indicates a filter device disposed on the lower surface side of the fuel pump 2, and 12 indicates a body of the filter device 11. The body 12 is formed almost in the same way as the body 4 described in the prior art, and the filter device 12 is a body of the filter device 11. There is a suction port 2A on one side across the mounting flange 12A.
A connection port 12B is provided on the other side, and a suction port 12C is provided on the other side. However, in the body 12, the filter mounting flange 12A is formed in a large-diameter elliptical shape, and a filter clamping portion 12A1 is formed on the outer peripheral side of the filter mounting flange 12A to clamp the base end 13B of the filter ₁₃ , which will be described later. It is set in a protruding shape. Furthermore, a fixing portion 12D to the bottom surface of the fuel pump 2 is provided on one side of the body 12, located on the outer peripheral side of the connection port 12B. and,
The suction port 12C of the body 12 is formed into a rectangular tube shape and opens downward. A pair of protrusions 12 are provided on the filter mounting flange 12A located on the left and right sides of the suction port 12C for mounting a spring 14, which will be described later.
E and 12E are protrudingly provided in a small diameter cylindrical shape.

Reference numeral 13 indicates a bag-shaped filter fixed to the filter mounting flange 12A so as to cover the suction port 12C of the body 12, and has a mesh diameter of about 70 μm, almost the same as the filter 5 described in the prior art of the filter 13. It is formed into a cylindrical shape, and its tip side 13A
After the spring 14 is attached, it is closed using means such as ultrasonic welding. Further, the proximal end 13B of the filter 13 is clamped and fixed in advance to the filter clamping portion _12A1 of the filter mounting flange 12A before the spring 14 is attached. The lower surface side of the filter 13 is pressed onto the inclined surface 1A of the fuel tank 1 by a spring 14, and the tip end side 13A extends toward the flat surface 1B side.

Reference numeral 14 denotes a filter expansion spring disposed inside the filter 13 to expand the filter 13 upward and downward. A substantially U-shaped connecting portion 14A is provided at the base end side, and mounting portions 14B, 14B, which are fitted and fixed to each protrusion 12E of the body 12, are provided at a distance from each other in the left-right direction of the body 12. ing. However, in the middle part of the spring 14, there are roller support parts 14C, 14C, which extend toward the lower surface of the filter 13 and are spaced apart from each other in the left and right direction and rotatably support each resin roller 15, which will be described later. 14D, 14D
is provided. And each support part 14C,
14D are located so as to face each other in the left-right direction, and are bent inward in the left-right direction in a V-shape so as to be overlapped.

Further, reference numerals 15 and 15 indicate resin rollers located within the filter 13 and rotatably supported between the respective support portions 14C and 14D of the spring 14, and each roller 15 is made of a glass material such as 6-6 nylon. (weight ratio: 30%) is formed into a cylindrical shape from a reinforced plastic material, and on both left and right end sides, support parts 14C and 14D of a spring 14 are provided to rotatably support each roller 15. It is involved. Each roller 15 is connected to a filter 13.
The lower surface of the filter 13 is in contact with the lower surface of the fuel tank 1 with a relatively large contact area, and the lower surface of the filter 13 is pressed onto the inclined surface 1A of the fuel tank 1 by the spring load of the spring 14.

Fuel pump filter device 11 according to this embodiment
has the above-mentioned configuration, and there is no particular difference in its basic operation from that of the prior art.

However, in this embodiment, by bending a portion of the spring 14 into a V-shape at a portion of the spring 14 extending toward the lower surface side of the filter 13 and facing each other in the left-right direction, each of the front and rear roller support portions 14 is bent.
C, 14D are integrally formed, and each roller support portion 14
A cylindrical resin roller 15 extending in the left-right direction is rotatably installed between C and 14D, and each resin roller 15 moves the lower surface side of the filter 13 onto the inclined surface 1A of the fuel tank 1 by the spring of the spring 14. Since it is configured to be pressed by a load, the filter 1 is pressed against the inclined surface 1A by each resin roller 15.
3 can reliably increase the contact area on the lower surface side of the filter 13, and even when the lower surface side of the filter 13 is displaced relative to the inclined surface 1A of the fuel tank 1 due to vibrations of the automobile, etc., the lower surface side of the filter 13 can be It is possible to prevent a concentrated load from being applied to the spring 14.

In addition, each roller support portion 14 is attached to the spring 14.
By integrally forming C and 14D, there is no need to separately provide a member for attaching each resin roller 15 other than the spring 14 for filter expansion.
Each resin roller 15 can be stored compactly within the filter 13, and problems such as an increase in the number of parts and poor workability during assembly can be solved.

Furthermore, when the filter 13 expands or contracts even slightly in the longitudinal direction of the filter 13 due to the suction pressure from the fuel pump 2 or the like, that is, in the direction of arrow B in FIG. The resin rollers 15 rotate smoothly along the lower surface of the filter 13 and allow the filter 13 to move in the front-rear direction, so that the lower surface of the filter 13 is connected to the inclined surface 1A of the fuel tank 1 and the spring 14. It is possible to effectively prevent rubbing between the surfaces and strong frictional contact on the inclined surface 1A.

Therefore, according to this embodiment, the resin rollers 15 can reliably prevent the lower surface side of the filter 13 from being partially worn out as in the prior art, and the life of the filter 13 can be greatly extended. .

In addition, in the above embodiment, the spring 14 has a
Although it has been described that two resin rollers 15, 15 are provided separately later, the number of resin rollers 15 may be three or more. Further, the body 12 and filter 13 may be similar to the body 4 and filter 5 described in the related art. Furthermore, each protrusion 12E of the body 12 may be provided on the left or right side of the outer circumferential side of the suction port 12C.

[Effects of the invention] As detailed above, according to the invention, the left and right springs are formed by bending a part of the spring, which extends toward the lower surface of the filter and faces each other in the left and right direction. A roller support section is integrally provided, and a resin roller that presses the bottom side of the filter against the bottom surface of the fuel tank is rotatably attached to each roller support section, so that the spring and the bottom side of the filter are not in contact with each other. The area can be expanded by the rollers, and the bottom side of the filter can be prevented from receiving concentrated load from the spring. In addition, when the filter expands or contracts even slightly, the roller rotates, and the filter moves between the spring and the fuel tank. It has various effects, such as being able to prevent the filter from being rubbed against the bottom surface, reliably suppressing wear on the filter, and extending its life.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a vertical sectional view of a fuel pump filter device installed in a fuel tank, Fig. 2 is a perspective view of the filter device with the filter removed, and Figs. 3 and 4 are related to conventional technology. and the third
FIG. 4 is a longitudinal sectional view of the fuel pump filter device installed in a fuel tank, and FIG. 4 is a perspective view of the filter device with the filter removed. 1... Fuel tank, 1A... Inclined surface, 1B...
Flat surface, 2...Fuel pump, 2A...Suction port, 11...Filter device, 12...Body, 1
2A...Filter mounting flange, 12B...Connection port, 12C...Suction port, 12E...Protrusion, 13...
...Filter, 14...Spring, 14A...Connection part, 14B...Mounting part, 14C, 14D...Supporting part, 15...Roller.

Claims (1)

[Scope of utility model registration request] It is arranged at the lower end side of a fuel pump installed in a fuel tank, and has a body with a filter mounting flange in between, one side serving as a connection port connected to the suction port of the fuel pump, and the other side serving as a suction port. a bag-shaped filter whose end side is fixed to a filter mounting flange of the body so as to cover the suction port of the body, and whose front end side serving as a closed end extends along the bottom surface of the fuel tank; attached to the body and extending the filter upward and downward;
A filter device for a fuel pump comprising a spring for expanding the filter that brings the lower surface side of the filter into contact with the bottom surface of the fuel tank, wherein the spring has a portion extending toward the lower surface side of the filter and facing in the left-right direction; Left and right roller support parts formed by bending a part of the spring are integrally provided, and each roller support part has a rotatable resin roller that presses the lower surface side of the filter against the bottom surface of the fuel tank. A filter device for a fuel pump, characterized in that it is attached.