JPS6023508Y2 - Support structure of fuel pump in fuel tank with built-in fuel pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a fuel pump in a fuel tank incorporating a fuel pump configured to pump fuel to an engine.

BACKGROUND ART Conventionally, a fuel pump has been built into a fuel tank in order to forcefully feed fuel to an engine.

In this case, the fuel pump is installed so that it hangs from the top of the fuel tank, but if the fuel pump is heavy, it is difficult to support it only on the top side of the fuel tank, so the bottom of the fuel tank However, it is possible to support it.

However, if the fuel pump is supported at the bottom of the fuel tank, there is a problem in that the vibrations and vibration noise generated by the fuel pump propagate to the bottom of the fuel tank and are amplified to generate large noise.

Therefore, the present invention was made in view of the above-mentioned conventional problems, and even if the fuel pump is supported on the bottom of the fuel tank, the vibrations and vibration noise of the fuel pump are not directly transmitted to the bottom of the fuel tank. It is an object of the present invention to provide a support structure for a fuel pump as described above.

To this end, in the present invention, the support structure is provided with an opening at the top of the fuel tank, a cover that seals the opening, and a cover that is hung vertically toward the bottom of the fuel tank. , a support member of the fuel pump that can be inserted through the opening is attached, the support member has a communication portion that communicates between the inside and the outside of the support member and allows fuel to pass therethrough; A fuel pump that pumps fuel to the engine is supported inside the member, and the fuel pump has a fuel outlet connected to a feed pipe that supplies fuel to the engine, and a communication portion of the support member that is connected to the fuel pump. A fuel intake port for taking in fuel is provided, and an elastic specimen that absorbs vibrations of the support member is fixed to the bottom of the fuel tank opposite to the opening of the fuel tank, and a The desired purpose is achieved by having a structure in which a projecting edge is provided that projects toward the opening and abuts against the side surface of the lower end of the support member to suppress lateral movement of the support member. They were made to be distant relatives.

A fuel tank 2 is composed of an upper shell 3 forming an upper part of the fuel tank 2 and a lower shell 4 forming a lower part of the fuel tank 2.
Joining flanges 3a and 4a are formed on the lower end periphery of the lower shell 4 and the upper end periphery of the lower shell 4, respectively, and these are joined by welding or the like.

The upper shell 3 is provided with an insertion opening 9 into which a support member 15 for supporting a fuel pump 1 (described later) is inserted, and the opening 9 is sealed with a cover 11.

The fuel pump 1 is composed of the entire pump (not shown) and a pump casing 20 that incorporates the pump body and supports the pump body.

Inside the pump casing 20, the pump main body (not shown) having a drive motor such as a support shaft, an armature, and a rotor is assembled.

At the top of the fuel pump 1, there is a fuel delivery port 2 for pumping fuel.
1, and a fuel intake port 19 that opens downward is provided at the bottom of the fuel pump 1.

The fuel delivery port 21 is connected via a flexible hose 12 to a feed pipe 22 that is inserted through the cover 11 and sends fuel to a key point such as a carburetor (not shown) of the engine. 12 is fastened to the fuel outlet 21 with a hose clamp 14.

Further, one end of pump drive wiring 10 passing through the cover 11 is connected to the upper part of the fuel pump.

A support member 15 for supporting the fuel pump 1 is provided around the outer periphery of the fuel pump 1 .

The support member 15 includes an upper support member 15a and a lower support member 15.
b, and a bottom support member 1 integrally formed at the lower end of the lower support member 15b so as to close the lower end of the lower support member 15b.
5c.

The upper support member 15a has its upper end fixedly attached to the back surface of the cover 11 by spot welding or the like, and is vertically provided toward the bottom surface of the lower shell 4 of the fuel tank 2.

The upper end of the lower support member 15b is attached to the lower end of the upper support member 15a with a bolt 23 via an elastic insulator 13, and the bottom support member 15c formed at the lower end of the lower support member 15b is It is arranged to be close to the bottom surface of the lower shell 4.

Further, a communication portion 18 is opened in substantially the lower half of the lower support member 15b, which communicates the inside and outside of the lower support member 15b, that is, the inside of the fuel tank 2, and sends fuel to the fuel pump 1. A filter 17 is stretched over the communication portion 18 .

The fuel pump 1 is located on the lower support member 15b side,
A fuel pump supporting elastic body 1 is provided at the center of the lower support member 15b.
6 in the lower support member 15b, and the fuel intake port 19 is arranged close to the bottom surface of the bottom support member 15c.

Further, on the upper and lower parts of the outer periphery of the pump casing 20 of the fuel pump 1, there are embossments 24.2 projecting outward.
4 is formed, and a pump casing 20 is formed inside the lower support member 15b at a position opposite to the embossing 24.24.
An embossment 25.25 is formed that protrudes toward the side,
The fuel pump supporting elastic body 16 has these embossments 2
4, 24, 25, 25.

On the bottom surface of the lower shell 4 facing the opening 9 provided in the upper shell 3 of the fuel tank 1, an elastic body 5 that supports the bottom support member 15c of the support member 15 is fixed with a clip 26 or the like. .

The elastic body 5 has a protruding edge 7 extending toward the opening 9 on its periphery and is formed to have a generally concave cross section, and on the inner side of the upper end of the protruding edge 7. A guide portion 8 having an inclined surface is formed to facilitate positioning of the lower end of the lower support member 15b.

Further, a large number of protrusions 6 are formed on the upper surface of the elastic body 5 to abut against the bottom support member 15c and to reduce the propagation of vibrations of the fuel pump 1 to the lower shell 4.

The lower end of the lower support member 15b is supported by the protruding edge portion 7 of the elastic body 5, and lateral movement is suppressed.

As described above, according to the present invention, the protruding edge portion having the guide portion erected around the periphery of the elastic body fixed to the bottom surface of the fuel tank seals the opening provided at the top of the fuel tank. Since the cover comes into contact with the lower end side surface of the support member fixed to the cover, it is possible to suppress the support member from moving in the lateral direction, and it is easy to position the support member. is absorbed, so
Noise can be reduced.

Further, according to the present invention, since the supporting member is supported by the cover and the elastic body that suppresses lateral movement of the lower end of the supporting member, the supporting force applied to the cover can be reduced.

Furthermore, according to the present invention, since the fuel pump is supported by a support member fixed to the cover and the elastic body, the fuel delivery port of the fuel pump is connected to the feed pipe that is inserted through the cover and sends fuel to the engine. The supporting force for supporting the fuel pump is not applied to the hose that supports the fuel pump.

Therefore, it is possible to use a flexible material or a material with low rigidity for the hose, and it is possible not only to absorb the variation in the dimensions of the fuel tank, but also to prevent vibration from being transmitted to the piping. It has the following effects:

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal cross-sectional view of a fuel tank equipped with a support structure for a fuel pump according to the present invention, FIG. 2 is a partially enlarged cross-sectional view of the fuel tank showing a support structure for the lower end of the fuel pump, and FIG. FIG. 4 is a partially enlarged perspective view of an elastic body showing an example of a protrusion shape. 1 is a fuel pump, 2 is a fuel tank, 5 is an elastic body, 6 is a protrusion, 7 is a protrusion, 8 is a guide part, 9 is an opening, 11 is a cover, 15 is a support member, 18 is a communication part, 19 is a fuel intake port, 21 is a fuel outlet port, and 22 is a feed pipe.

Claims (1)

[Scope of utility model registration request] A fuel pump is provided with an opening in the upper part of the fuel tank, the opening is provided with a cover that seals the opening, the fuel pump is installed vertically on the cover toward the bottom of the fuel tank, and is insertable through the opening. A support member is attached to the support member, a communication portion is opened in the support member to allow communication between the inside and the outside of the support member and through which fuel can pass, and the inside of the support member is provided with:
A fuel pump that pumps fuel to the engine is supported, and the fuel pump includes a fuel delivery port connected to a feed pipe that supplies fuel to the engine, and a fuel intake port that takes in fuel through the communication portion of the support member. An elastic body that absorbs vibrations of the support member is fixed to the bottom of the fuel tank facing the opening of the fuel tank. A support structure for a fuel pump in a fuel tank with a built-in fuel pump, characterized in that a protruding edge portion is provided to protrude from the side surface of the lower end of the support member and suppress lateral movement of the support member. .