JPH11294285A - Fuel supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supplying device conformable to various tank depths and inexpensively manufacturable. SOLUTION: In a fuel supplying device containing a fuel pump 1 and a fuel filter 2 and arranged within a fuel tank, a lid 5 for closing the upper opening part of the fuel tank, which has a fuel delivery passage and a vessel 6 for supporting the fuel pump 1 and the fuel filter 2 are made into an integrated structure by connecting the respective connecting parts. Otherwise, the lid 5 and the vessel 6 are made into an integrated structure through a connecting member 20 having connecting parts connectable with the respective connecting parts of the lid 5 and the vessel 6.

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 automobile engine or the like, and more particularly to a fuel supply device having a built-in fuel pump, a fuel filter and the like and arranged in a fuel tank.

[0002]

2. Description of the Related Art An example of a fuel supply device having a built-in fuel pump, a fuel filter and the like and arranged in a fuel tank is proposed in WO 96/23967. In this fuel supply device, a housing for accommodating a C-shaped fuel filter is welded to a lid for closing an opening of a fuel tank, and is integrally formed. Further, the fuel pump is provided so as to be disposed inside the fuel filter. It is held by a pump holder locked to the housing. The fuel supply device is mounted so as to be suspended in a fuel tank, and a fuel pump sucks fuel from the bottom of the fuel tank and supplies the fuel to the engine.

The fuel supply device proposed in US Pat. No. 5,038,741 has a fuel pump housed in a container which is attached to a lid for closing an opening of the fuel tank and which is arranged in the fuel tank. This container has a bellows at the part above the fuel pump housing part. The convex part protruding from the lower part of the bellows supports the upper part of the fuel pump through an elastic body, and the lower part of the fuel pump through the bush at the bottom of the container. I support. When the container is attached to the fuel tank, the bellows is compressed, and the elasticity causes the bottom of the container to be pressed against the bottom of the fuel tank.

[0004]

The re-published patent WO9
When the fuel supply device proposed in Japanese Patent Application Laid-Open No. 6/23967 is used for various fuel tanks having different depths, it can be dealt with by changing the depth of the housing that houses the fuel filter. There is a problem that the number of types of parts having a large and complicated shape is increased, which leads to an increase in cost.

In the case where a plurality of types of pump holders are prepared to cope with the problem, there is a problem that the number of types of parts increases and the cost increases as in the case described above. In the case of a deep tank, the length of the pump holder attached to the housing containing the fuel filter becomes longer, which is disadvantageous for vibration. In this case, it is necessary to improve the method of supporting the fuel pump. Furthermore, in the case of a deep tank, the fuel filter is often above the liquid level in the tank, which is disadvantageous in dissipating static electricity generated in the filter element.

The fuel supply device proposed in US Pat. No. 5,038,741 has a problem that the structure is complicated and the manufacturing cost is high. Further, since the bottom of the container is pressed against the bottom of the fuel tank, a high strength is required, which also increases the manufacturing cost. Furthermore, the range in which the bellows can be deformed is limited, and there is a problem that the depth of the tank that can be handled is narrow. It should be noted that a wider range of tank depths can be accommodated by increasing the types of containers, but in that case, the manufacturing cost is further increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fuel supply apparatus which can cope with a wide range of tank depths at a low manufacturing cost.

[0008]

A fuel supply device according to the present invention includes a fuel pump and a fuel filter and is disposed in a fuel tank. In the fuel supply device, an upper opening of the fuel tank is closed and a fuel outflow / inflow passage is provided. And a container body that supports the fuel pump and the fuel filter by connecting the respective coupling portions to form an integral structure, or a coupling portion that can be coupled to the coupling portion of the lid and the container body. The lid and the container can be integrated with each other via a connecting member.

Further, in the fuel supply device, the fuel filter has a cylindrical shape and the fuel pump is disposed inside the fuel filter.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel supply device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external front view showing a fuel supply device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the fuel supply device. The lid 5 shown in the figure is attached to the fuel tank so as to close the opening of the fuel tank. The lid 5 is integrally provided with a cylindrical portion 5a extending downward, and holds the container 6 at a lower portion of the cylindrical portion 5a.

That is, the hole 5 provided in the cylindrical portion 5a
The connecting projections 6b provided on the container body 6 are locked to the b, 5b,. The holes 5b, 5b,... Are provided at four regular intervals around the cylindrical portion 5a.
d and 5d are provided so that the engagement is easily performed by elastic deformation.

As shown in FIG. 2, a filter case 6a for accommodating the annular fuel filter 2 is formed in the container body 6. Fuel pump 1 inside filter case 6a
Are disposed and supported by a pump holder 7 fixed to the filter case 6a. The strainer 8 is rotatably attached to the suction port of the fuel pump 1, and rotates between a position shown by a solid line and a position shown by a two-dot chain line in accordance with the depth of the fuel tank so as to be close to the bottom of the fuel tank. To position.

The discharge port 1a of the fuel pump 1 has a gasket 1
0, it is fitted to a fuel inlet 6c formed in the container body 6. The fuel inlet 6c communicates with the upper space of the filter case 6a, and guides the fuel sucked through the strainer 8 and discharged from the fuel pump 1 to the upper part of the filter 2. The lower portion of the filter case 6a communicates with a pressure regulator 3 formed on the container 6, and the pressure regulator 3 further communicates with a check valve 9 attached to the container 6. The check valve 9 is fitted through a gasket 11 to a fuel discharge port 5 e formed in the lid 5.

A fuel supply pipe 12 for supplying fuel to the engine is connected to the fuel discharge port 5e. As described above, the fuel flowing downward through the filter 2 is supplied to the engine through the pressure regulator 3, but when the pressure in the pressure regulator 3 increases, the pressure from the pressure regulator 3 to the pressure regulator return passage 15
And the fuel supply pressure to the engine is kept constant.

Pressure regulator return passage 1
The fuel flowing through the fuel tank 5 returns to the fuel tank through the assist pump 4 and the discharge passage 16 provided in the container 6, and the assist pump 4 sucks the fuel from the sub tank. That is, the saddle-type fuel tank as a whole has a shape in which the main tank in which the above-described fuel supply device is disposed and the sub-tank communicate with each other at the top, and it is necessary to suck the fuel in the sub-tank from above. The suction pipe 13 connected to the bottom of the sub-tank is a fuel suction port 5 provided in the lid 5.
f, and the fuel suction port 5f is connected to the assist pump 4 via the suction hose 14.

FIG. 3 shows a cross section of the assist pump 4. As shown in the figure, the pressure regulator return passage 1
5 has a tapered tapered end, where the fuel flow becomes faster, the pressure drops and the suction hose 1
4. Aspirate fuel from 4. Thus, the fuel sucked from the sub tank by the assist pump 4 flows into the main tank together with the fuel returned from the pressure regulator 3.

As described above, the container 6 in which the fuel pump 1, the fuel filter 2, the pressure regulator 3 and the assist pump 4 are incorporated is engaged with the lid 5 to be integrated, and the lid 5 As shown in FIG. 1, a window 5c is provided, and the suction hose 14 can be assembled from the window 5c.

When the above-described fuel supply device is used for a deep fuel tank, the container 6 is connected to the lid 5 via a connecting member 20, as shown in FIGS. Coupling member 20
Is formed in a cylindrical shape, and a lower portion thereof is provided with a hole 20a and a slit 20b having the same shape as the hole 5b and the slit 5d of the lid 5, and an upper portion is formed with the engaging projection 6b of the container body 6. An engagement projection 20c having a shape is provided.
By engaging the engagement projection 6b of the container 6 with the hole 20a and the engagement projection 20c of the coupling member 20 with the hole 5b of the lid 5, the container 6, the coupling member 20 and the lid 5 are integrated. Becomes

As shown in FIG. 5, the portion below the check valve 9 and the assist pump 4 incorporated in the container body 6 is shown in FIG.
Is the same as that shown in FIG. Check valve 9 is high pressure hose 2
1, connected to the fuel outlet 5e through the joint 23 and the gasket 11. The assist pump 4 is connected to a fuel suction port 5f via a suction hose 22. These connecting operations can be performed from the window 5c of the container body 5.

Thus, according to the depth of the fuel tank,
The fuel supply device of this embodiment can be used for various fuel tanks only by preparing the connecting member 20, the high pressure hose 21, and the suction hose 22. The coupling member 20 and the like have a simple shape, and the increase in manufacturing cost due to the increase in these components is slight. And since the assembly process to the container body 6 is common to all fuel tanks,
This is advantageous in terms of assembly work and process management.

[0021]

As described above, according to the fuel supply apparatus of the present invention, most parts, especially expensive parts such as a filter case, can be shared for various depths of the fuel tank. In addition, since the process of assembling the main parts can be shared, the manufacturing cost is greatly reduced, the reliability is increased, and the management of the manufacturing and the stock is facilitated.

[Brief description of the drawings]

FIG. 1 is an external front view showing a fuel supply device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the fuel supply device.

FIG. 3 is a sectional view showing an assist pump of the fuel supply device.

FIG. 4 is an external front view showing another state of the fuel supply device.

FIG. 5 is a sectional view showing the same state of the fuel supply device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fuel pump, 1a Discharge port 2 Fuel filter 3 Pressure regulator 4 Assist pump 5 Lid, 5a cylindrical part, 5b hole, 5c window, 5d
Slit 5e Fuel discharge port 5f Fuel suction port 6 Container body, 6a Filter case, 6b Coupling projection, 6c Fuel inflow port 7 Pump holder 8 Strainer 9 Check valve 10, 11 Gasket 12 Fuel supply pipe 13 Suction pipe 14 Suction hose Reference Signs List 15 precision regulator return passage 16 discharge passage 20 coupling member, 20a hole, 20b slit, 20
c Coupling projection 21 High pressure hose 22 Suction hose 23 Joint

Claims (2)

[Claims] 1. A fuel supply device which includes a fuel pump and a fuel filter and is disposed in a fuel tank. The fuel supply device includes a lid closing an upper opening of the fuel tank and having a fuel outflow / inflow passage, a fuel pump and a fuel filter. The lid and the container body are connected to each other by connecting the respective coupling portions to the supporting container body to form an integral structure, or via a coupling member having a coupling portion that can be coupled to the respective coupling portions of the lid and the container body. And a fuel supply device that can be integrated. 2. The fuel supply device according to claim 1, wherein the fuel filter has a cylindrical shape, and the fuel pump is disposed inside the fuel filter.