JPH0976774A - Fuel tank attaching structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability during a vehicle assembling process and to prevent the leakage of fuel by buckling and deforming a rear suspension frame. SOLUTION: A fuel tank 4 is surrounded by a periphery in the front part of a rear suspension frame 2 attached to a car body side via a bush 3, the fuel tank 4 is fixed to the rear suspension frame 2 based on a positional relationship and a part immediately after a portion surrounding the fuel tank 4 of, a rear suspension frame 2 is caused to be a weakest part against an input from a vehicle rear part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle fuel tank mounting structure.

[0002]

2. Description of the Related Art As a conventional vehicle fuel tank, for example, there is one shown in FIG. Conventional example is actual Kaihei 3-8
Japanese Patent No. 8925 discloses that a cross member 2 is laid horizontally between a pair of rear side members 1 extending in the vehicle front-rear direction, and a fuel tank 3 is sandwiched between the cross members 2 and the rear side member 1 or It is fixed to the cross member 2.

[0003]

However, in such a conventional fuel tank mounting structure for a vehicle, a cross member is added for the purpose of protecting the fuel tank.
The fuel tank had a structure (body and rigid body) that was fixed to the body side parts on the floor. For this reason, although it contributes to the improvement of vehicle body rigidity, it does not share parts with chassis parts, etc.
The fuel tank does not move independently in the direction opposite to the force-applying side in the case of a collision in which the work of assembling the fuel tank, which raises the cost, occurs and the workability of vehicle assembly is poor. However, there is a problem in that it is difficult to obtain the energy absorption stroke of the vehicle body while being dominated by the deformation.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art, to improve the workability of mounting a fuel tank, and to provide a fuel tank mounting structure for a vehicle which is less likely to be subject to deformation of the vehicle body. .

[0005]

In order to solve the above-mentioned problems, the present invention is a suspension frame elastically supported by a vehicle body, wherein the front shape of the suspension frame is configured to surround a fuel tank. The fuel tank was attached to the relevant part.

[0006]

According to the present invention, the rear suspension frame, which is a rigid part that is horizontally mounted on the vehicle body by the bush between the rear sides under the floor, has a shape that surrounds the fuel tank in the vehicle front-rear and left-right directions, and the fuel tank is inside the rear suspension frame. Fixed to.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention.

First, the structure will be described. A rear suspension frame 2 for mounting a rear suspension is attached to a rear side member 1 via a bush 3. The rear suspension frame 2 has a shape surrounding a fuel tank 4 from the periphery. ing. The fuel tank 4 is fixed to the rear suspension frame 2, and the rear suspension frame 2 contacts the vertical wall of the rear side member 1 when the rear suspension frame 2 moves in the vehicle front-rear direction at the time of a rear collision (5 in the figure). This contributes to the buckling deformation of the rear suspension frame 2 at the portion shown in the figure at the time of a rear surface collision.

Next, the operation will be described.

Since the fuel tank 4 is fixed to the rear side member 1 via a bush, a mass damper action is given to the fuel tank, so that the floor (idle) as shown in FIG.
Vibration can be reduced. The performance improvement allowance is 5 to 10 dB at the driver's seat vibration acceleration level, which is a level at which the difference can be identified by the sensation (see FIG. 3).

Since the fuel tank can be sub-assembled to the rear suspension frame, workability in the vehicle assembly process can be improved.

At the time of a rear-end collision, the rear suspension frame is buckled and deformed in front of the fuel tank to absorb the collision energy and to prevent the members surrounding the fuel tank from being modified (see FIG. 5).

FIG. 4 shows another embodiment.

In this embodiment, when the fuel tank is made of resin and can be easily molded, it improves the workability of mounting on the rear suspension frame and reduces the number of fastening parts. The front, rear, left and right vertical walls of the fuel tank are projected. 5 and 6 are provided, and the sub-ASSY can be easily performed by dropping the fuel tank into the rear suspension frame from above and fixing the protrusions to the rear suspension frame.

The present embodiment can also be applied to a metallic fuel tank.

[0017]

As described above, according to the present invention, the structure is such that the fuel tank is surrounded from the periphery by the front portion of the rear suspension frame mounted on the vehicle body side through the bush, and the positional relationship is concerned. The fuel tank is fixed to the rear suspension frame with, and the part immediately after the part surrounding the fuel tank of the rear suspension frame is made the weakest part against the input from the rear of the vehicle, so floor vibration can be reduced and fuel leakage Can be prevented,
Furthermore, the workability of attaching the fuel tank to the rear suspension frame is improved.

[Brief description of drawings]

FIG. 1 is a view showing a conventional vehicle fuel tank mounting structure.

FIG. 2 is a view showing a vehicle fuel tank mounting structure of the present invention.

FIG. 3 is a driver floor idle vibration graph (predicted value) of the present invention.

FIG. 4 is a diagram showing a fuel tank fixing method of the present invention.

FIG. 5 is a diagram showing a buckling deformation state of a rear suspension frame.

[Explanation of symbols]

 1 Rear side member 2 Rear suspension frame 3 Bushing 4 Fuel tank 5 Protrusion 6 Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yasuda 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (3)

[Claims] 1. A suspension frame elastically supported by a vehicle body, wherein a front portion of the suspension frame is configured to surround a fuel tank, and the fuel tank is attached to the portion. Vehicle fuel tank mounting structure. 2. A rear portion of the suspension frame surrounding a fuel tank is provided with respect to an input from the rear of the vehicle.
The fuel tank mounting structure for a vehicle according to claim 1, wherein the weakest portion is provided. 3. When an input from the rear of the vehicle causes the suspension frame to relatively move forward of the vehicle with respect to the vehicle body beyond a predetermined position, the front portion of the suspension frame with respect to the weakest portion interferes with the vehicle body to cause the relative displacement. The fuel tank mounting structure for a vehicle according to claim 2, wherein the fuel tank mounting structure is configured so as to restrict the above.