JPS61190180A - Fuel pump holding construction - Google Patents

Abstract

PURPOSE:To reduce stress applied to the root of the installing part of a bracket by providing legs which spread apart from each other toward the bottom of a fuel tank, and reducing the swing of a fuel pump being suspended from the top face inside the fuel tank, due to the vibration of a car body. CONSTITUTION:The captioned device consists of a fuel pump 1, a stay 7 provided on the top face 9 inside the fuel tank toward the bottom face 10 inside the fuel tank, a bracket 4 for supporting the fuel pump 1 on the stay 7, bolts 6 and nuts 8 for fixing the bracket 4 to the stay 7, vibration insulating rubbers 5a, 5b placed between the stay 7 and the bracket 4, and shock absorbing rubbers 2a, 2b having legs 31a, 32a, 31b, 32b which spread apart from each other toward the fuel tank bottom 10. Due to above mentioned construction, swing of the fuel pump 1 which is suspended from the top face inside the fuel tank by means of the bracket 4, due to the vibration of a car body, can be absorbed within the range of compression of the legs 31a, 32a, 31b, 32b, thereby, reducing a bending stress applied to the root of the installing part of the stay 7 on the top face 9 of the fuel tank.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fuel pump holding structure, and particularly to a fuel pump holding structure that is suitable for electronically controlled fuel injection devices of automobile engines.

[Background of the invention]

The fuel pump conventionally held in the fuel tank was developed in 1983.
- As described in No. 16527, the fuel tank is suspended from the upper surface of the fuel tank by a bracket, and when the fuel tank is subjected to vibrations in the front-rear direction or left-right direction, the bracket with the fuel pump becomes cantilevered and oscillates. Since the bracket is easily attached, there is a problem that the strength of the base of the attachment portion of the bracket to the upper surface of the fuel tank is weak.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel pump holding and replenishing structure in which the fuel pump, which is supported on the inner upper surface of the fuel tank, does not oscillate even when the fuel pump is subjected to vibrations of the vehicle body.

[Summary of the invention]

The present invention reduces the swinging of the fuel pump due to vibrations of the vehicle body by providing legs that diverge from each other toward the bottom of the fuel tank on the conventional fuel pump holding structure that hangs down from the upper surface of the fuel tank by a bracket. Therefore, the stress applied to the base of the attachment portion of the bracket to the upper surface inside the fuel tank is reduced.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 6. FIG. 1 is a perspective view of the embodiment of the present invention, and FIG. 2 is a front view thereof.

The configuration includes an electric fuel pump 1 and an upper surface 9 inside the fuel tank.
The stay 7 provided closer to the inner bottom surface 10 of the fuel tank
, a bracket 4 that supports the fuel pump 1 on the stay 7, bolts 6 and nuts 8 that fix the bracket 4 to the stay 7, and are arranged between the stay 7 and the bracket 4. Anti-vibration rubber 58.5b, and legs 31a and 32a that diverge from each other toward the fuel tank bottom 10
.

Further, the state of attachment to the body of an automobile is shown in FIG. The fuel pump 1 is installed in a fuel tank 11 provided near the rear seat of an automobile.

The fuel pump 1 is electric and generates vibrations itself. When this vibration is transmitted directly to the fuel tank,
There is noise inside. To prevent this, the fuel pump 1 is attached to the fuel tank 11 via anti-vibration rubbers 5a and 5b. However, in order to absorb this vibration, if the anti-vibration rubbers 5a and 5b are made soft, when the vehicle body is subjected to external vibrations, the bracket 4 will be moved by the anti-vibration rubber 5.
It falls off from a and 5b. Alternatively, there is a problem that the vibration-proof rubbers 5a and 5b may fall off from the stay 7. Further, in order to effectively use the fuel in the fuel tank 11, the fuel pump 1 needs to be installed with the fuel suction port 1a as close to the fuel tank bottom 10 as possible.

Therefore, as mentioned above, when the vehicle body is subjected to vibration from the outside with soft anti-vibration rubber, the fuel pump 1 is shaken and collides with the bottom of the fuel tank, causing one or both of the fuel pump 1 and the fuel tank to be damaged. There is also the problem of damage. Furthermore, mounting the fuel pump 1 closer to the fuel tank bottom 10 means increasing the distance from the fuel tank top surface 9, which is the mounting portion, to the fuel pump 1. Therefore, stay 7 bracket 4, fuel pump 1,
A structure consisting of a cantilever beam is considered to have a mass at the tip, and is weak in terms of strength. Therefore, when the vehicle body is subjected to vibrations from the outside as described above, the fuel pump 1 tends to oscillate, causing the same problem of collision with the fuel tank bottom 10 as described above. Also, the upper surface 9 inside the fuel tank of the stay 7
Since the maximum bending stress is applied to the base of the attachment part, there is a risk of damage.

In the present invention, the fuel pump 1 is tightly enclosed around the entire circumference of the fuel pump 1, and the fuel pump 1 has two parts that extend toward the bottom surface 10 of the fuel tank.
Two shock absorbing rubbers 28.2b having real legs 31a, 31b (or 32a, 32b) are provided.

Shock absorbing rubber feet 2a, 2b, 31a, 32a, 31
The height from the lower end of b, 32b to the upper end of the stay 7 is made slightly larger than the height inside the fuel tank 11.

That is, when the fuel pump is installed in the fuel tank 11, the legs 31a, 32a, 31b, 32b are compressed and pressed against the fuel tank bottom 10. Therefore, due to the frictional force between these legs 31a, 32a, 31b, and 32b with the fuel tank bottom 10, the fuel pump 1 begins to swing from side to side with X-Y as the center of amplitude in FIG. Even in this case, there will be no deviation in the initial stage.

Next, let us consider the case where the fuel pump 1 swings further toward the right in FIG. 2. When the base 14 of the leg 31a moves to the right, the leg 31a is subjected to even stronger compression between the fuel pump 1 and the fuel tank bottom 10. Along with this, the tip 15 of the leg 31a has a stronger frictional force than the initial one, so that it does not shift. That is, the tip 15 of the leg 31a does not need to be fixed in particular, and the installation work is the same as before, and it is absorbed within the compression range of the legs 31a, 32a, 31b, 32b, so that the upper surface 9 of the fuel tank of the stay 7, The bending stress applied to the base of the attachment part is also reduced.

In addition, when the vehicle body receives vibration from the outside, the bracket 4,
falls off from the anti-vibration rubbers 5a and 5b.

Alternatively, problems such as the vibration-proofing rubbers 5a, 5b falling off from the stay 7 are also solved, so the vibrations generated by the fuel pump 1 are transmitted to the fuel tank 11 by making the vibration-proofing rubbers 5a, 5b sufficiently soft. It also has the effect of preventing noise from occurring inside the room.

〔Effect of the invention〕

According to the present invention, even if the fuel pump 1 hanging down from the inner upper surface 9 of the fuel tank receives vibrations from the vehicle body, the vibrations are received by the compressive force of the feet, so that it is possible to provide a holding structure in which the swinging of the fuel pump is small.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a diagram showing how it is installed on a vehicle body. 1...Fuel pump, 2a, 2b...Shock absorption rubber, 4...Bracket, 5a, 5b...Vibration isolation rubber,
7... Stay, 9... Fuel tank inner top surface, 10...
・Bottom of fuel tank.

Claims (1)

[Claims] 1. A holding structure for a fuel pump that is held in a fuel tank by a bracket hanging from the top of the fuel tank has at least two flexible legs, and the legs are designed to prevent vibrations that the fuel tank receives from the outside. A holding structure for a fuel pump, characterized in that the fuel pump extends toward the bottom of the fuel tank with a center line centered around a neutral line on which the fuel pump swings, and is pressed against the bottom of the fuel tank.