JPH078283Y2 - Fuel tank - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fuel tank mounted in an automobile or the like, and more specifically, by providing a bead around a mounting hole, a lean force force provided in the portion is provided. Is intended to be abolished.

<Prior Art> A fuel tank of an automobile is usually attached to a vehicle body by fastening members such as bolts.

FIG. 3 shows a perspective view of a conventional fuel tank attached to the rear part of the body of a passenger car. In this example, a thin-walled steel fuel tank 1 is provided with a large number of bolts 3 penetrating a flange 2 on the outer periphery. It is attached to a mounting bracket 5 of the body 4.

As shown in FIG. 4 (enlarged cross section of A part in FIG. 3), the flange 2 is a flange portion 6 of each of the upper tank 6 and the lower tank 7.
It is formed by integrating a and 7a by seam welding (B portion in the figure). An appropriate number of mounting bolt holes 8 are formed in the flange 2, and the bolts 3 penetrate the bolt holes 8.

By the way, the weight of the fuel tank 1 filled with fuel is several tens.
There is also kg (about 30 to 80 kg depending on the model). When a vehicle climbs over a step while traveling, a shock is also applied, and a large stress is generated around the bolt hole 8 of the flange 2 which is a thin steel plate. Therefore, if the strength or rigidity of the portion is insufficient, cracks or deformations occur, and there is a risk of falling off.

Therefore, on the lower surface of the flange 2 in which the bolt holes 8 are formed, in order to improve strength and rigidity, an L-shaped reinforcement 9 as a reinforcing member as shown in FIG. 4 is spot-welded (in the figure, C portion), and the occurrence of cracks or deformation of the portion is prevented.

<Problems to be Solved by the Invention> The above fuel tank 1 has the following manufacturing problems.

In the production of mass-produced automobile parts, naturally, it is strongly required to reduce the production time (the number of processes) and the number of constituent parts.

However, in the conventional fuel tank 1, as described above, the upper tank 6 and the lower tank 7 are integrated by seam welding, while the lean reinforcement 9 is spot welded to the flange 2 after being integrated. . As a result, these cannot be performed at the same time, and always require two steps.

Further, since the lean facement 9 is provided by the number of the bolt holes 8, the number of constituent parts is increased and equipment for spot welding is required, which is an obstacle to reducing the cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for manufacturing a fuel tank more easily and at a lower cost than the current situation.

<Means for Solving the Problem> Therefore, in order to solve this problem, the present invention is manufactured by integrating the flange portions formed on the outer peripheries of the upper tank and the lower tank by seam welding, and A fuel tank mounted on a vehicle body by a fastening member through a mounting hole formed in the flange portion, wherein a reinforcing bead forms a closed space around the mounting hole and between the fastening member and the mounting bracket. The present invention proposes a fuel tank characterized in that

<Operation> Since the reinforcing bead is formed around the mounting hole between the fastening member and the mounting bracket so as to form a closed space, the strength and rigidity of the portion can be maintained high even if the reinforcement is abolished. .

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an enlarged cross section of a mounting portion of a fuel tank according to the present invention, and FIG. 2 shows a view taken in the direction of arrow D in FIG. still,
In the description of the embodiments, the same members as those described in the above-mentioned conventional apparatus are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in this figure, in the fuel tank 1 of this embodiment, a substantially rectangular bead 10 is formed around each bolt hole 8 of the flange 2. The bead 10 is provided along the flange 2, and forms a closed cross section by symmetrically forming the flange portions 6a and 7a on the upper tank 6 side and the lower tank 7 side, respectively. And this flange 2
The bead 10 is located between the bolt 3 and the mounting bracket 5 so as to be sandwiched between them.

The operation of this embodiment will be described below.

As is well known, when beading is performed on a flat steel sheet, the rigidity of the processed portion is improved due to the change in the section modulus, and the hardness (strength) is increased due to plastic deformation. Therefore, in the case of the present embodiment, the stress due to the load or impact input from the bolt 3 is dispersed on the outer periphery of the bead 10, and the occurrence of cracks or bending is prevented even in the state where there is no reinforcement.

Although the bead formed around the bolt hole 8 has a rectangular shape in the present embodiment, it may have a circular shape. Further, in the present embodiment, the beads are formed on both the upper tank and the lower tank, but the beads may be formed on only one side.

<Effects of the Invention> According to the present invention, the reinforcing beads are formed between the fastening member and the mounting bracket so as to form a closed space around the mounting hole of the flange portion of the fuel tank. Play.

Since the beads are formed at the same time when the upper tank and the lower tank are formed, the welding man-hours are reduced and the time required for the production is shortened as compared with the conventional one in which the reinforcement is attached.

Even if there is no reinforcement, the rigidity of the flange portion can be sufficiently ensured, the number of constituent parts can be reduced, and the manufacturing equipment can be simplified to reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of a fuel tank according to the present invention, and FIG. 2 is a view taken in the direction of arrow D in FIG. Further, FIG. 3 is a perspective view of a conventional fuel tank, and FIG. 4 is an enlarged sectional view of a portion A in FIG. In the figure, 1 is a fuel tank, 2 is a flange, 3 is a bolt, 6 is an upper tank, 7 is a lower tank, 8 is a bolt hole, and 10 is a bead.

Claims (1)

[Scope of utility model registration request] 1. A vehicle body, which is produced by integrating flange portions formed on the outer circumferences of an upper tank and a lower tank by seam welding, and is attached to a vehicle body by a fastening member through a mounting hole formed in the flange portion. A fuel tank to be mounted, wherein a reinforcing bead is formed around the mounting hole and between the fastening member and the mounting bracket to form a closed space.