JP2001018666A - Mounting part structure for fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress transmitted from a mounting hole for tank to a continuous welding part and improve durability by expanding and forming a space between the continuous welding part and the mounting hole in a structure overlapping with flanges of divided tank members to be welded and opening the mounting hole for tank on the flanges. SOLUTION: A fuel tank is integrally formed by making divided steel plate tank members 2, 2 coincide with each other in the vertical direction and continuously welding 6 flanges 4 to each other which are provided on a surrounding part of each tank member 2. In this case, the continuous welding part 6 is curvedly provided so as to avoid a mounting hole 9 formed on the flanges 4. Namely, a detour part is provided and the detour shape is formed into a circular arc shape with the mounting hole 9 as a center so as to reduce stress transmission from the mounting hole 9 to the continuous welding part 6. Therefore, a recessed part 17 is molded in a side part (a vertical wall plate) 16 of the tank member 2 at a portion corresponding to the mounting hole 9 and the flanges 4 are provided with width expanding parts 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art A type in which a flange of a divided tank member is continuously welded, a mounting hole of a tank is formed in the overlapped flange, and this portion is connected to a vehicle body is known as an automobile. Used in the field. The present invention belongs to such a technical field.

[0002]

2. Description of the Related Art The prior art will be described with reference to FIGS. The fuel tank 1 is configured by matching tank members 2 and 3 made of split steel plates.
Each of the tank members 2 and 3 has a container shape, and flanges 4 and 5 are formed around the container members 2 and 3.
5 was superposed and this part was continuously welded. This continuous weld is indicated by reference numeral 6, and seam welding or laser welding is employed as a welding method. As shown in FIG. 5, the protruding pieces 7 (and 8) are provided on the flange 4 (and 5).
Is formed, and a mounting hole 9 is formed at a substantially central portion thereof.

[0003] The fuel tank 1 is directly fixed to a part of the vehicle body, and its structure will be described. A reinforcing member 11 having a hat-shaped cross section, for example, a side member is welded to the lower surface of a steel sheet floor panel 10, and the protruding piece 7 is adhered to a bottom plate 12 of the reinforcing member 11, and is firmly secured with bolts and nuts as shown in the figure. Is joined to. The bolt 13 is screwed into the nut 14 through the mounting hole 9 and the bottom plate 12. The nut 14 is used for the bottom plate 1 of the reinforcing member 11 in advance.
2 is a projection nut welded to FIG. The coupling structure as shown in FIG. 4 is provided at two or three places on the outer periphery of the tank.

On the other hand, Japanese Unexamined Utility Model Publication No. 60-29724 is cited as prior art of the present invention. Here, it is disclosed that the flange of the fuel tank is connected to a part of the vehicle body, but no consideration is given to welding parts as described below.

[0005]

A stress is applied to the continuous welded portion 6 due to the movement of the fuel liquid and the weight of the tank members 2 and 3. However, since the vibration and load of the tank 1 act near the mounting hole 9, the stress caused by the vibration and the load is reduced.
It will act on the nearby continuous weld 6. Such a phenomenon causes a large stress to act on a specific portion of the continuous welded portion 6, and there is room for further improvement in the design of the welded structure.

[0006]

SUMMARY OF THE INVENTION The present invention has been provided to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that the flanges of the divided tank members are overlapped, In the type in which the overlapped portion is continuously welded and the mounting hole of the tank is drilled in the overlapped flange, the interval between the continuous welded portion and the mounting hole is enlarged, thereby continuously connecting the mounting hole to the mounting hole. It is characterized in that the stress transmitted to the weld is reduced. Therefore, various vibration loads input to the mounting holes are reduced to such an extent that it does not matter if they reach the continuous welded portion.

According to a second aspect of the present invention, in the first aspect, the continuous welded portion has a shape bypassing the mounting hole. Therefore, the distance from the mounting hole to the continuous weld is increased, and the stress load on the continuous weld is reduced.

According to a third aspect of the present invention, in the second aspect, in order to obtain a detour shape of the continuous welded portion, a concave portion is provided on a side portion of the tank, and the width of the flange near the mounting hole is increased. Features. Therefore, as described above, the distance from the mounting hole to the continuous welded portion can be increased, and when the bead for tank reinforcement is formed into a concave portion, the existing bead-shaped portion is utilized to increase the flange width. This is advantageous for streamlining the structure.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. In addition, about the member which has the same function as the member demonstrated in the prior art, the same code | symbol is described in the figure and detailed description is abbreviate | omitted. FIG.
2 and FIG. 2, the continuous welded portion 6 is curved so as to avoid the mounting hole 9, and reference numeral 15 indicates a bypass portion. This detour shape is selected so that stress transmission from the mounting hole 9 to the continuous welded portion 6 is reduced or is not transmitted. In the case of FIGS. is there.

In order to obtain such a detour shape, a concave shape is applied to the side of the tank at a location corresponding to the mounting hole 9 to increase the flange width. That is, the concave portion 1 is formed on the lateral side (vertical wall plate) 16 of both tank members 2 and 3.
7 is provided with a widened portion 18 of the flange. The detour portion 15 has a shape bulging toward the widened portion 18. In addition, the concave portion 17 may be formed only on the lateral portion 16, but on the other hand, a reinforcing bead that circulates from the lateral portion 16 to the ceiling portion or the lower bottom portion is used to install an increased flange width portion. Can be used for

In the embodiment shown in FIG. 3, the width of the flanges 4 and 5 can be sufficiently widened. In such a case, the continuous welded portion 6 is linear or extremely small even if bent. As shown in the drawing, the distance between the mounting hole 9 and the continuous welded portion can be set to be larger than that in the case of FIG.

[0012]

According to the present invention, since the distance between the mounting hole and the continuous welding portion is set to an appropriate distance, various types of stress of the tank input to the mounting hole are harmful to the continuous welding portion. Without any level. Therefore, it is not necessary to attach a reinforcing member near the mounting hole.

Since the continuous welded portion has a shape bypassing the mounting hole, the above-mentioned appropriate interval can be secured by a simple method. Further, by providing a concave portion on the tank lateral side to obtain a detour shape of the continuous welded portion, the flange width is enlarged and detour can be easily performed. At the same time, by widening the flange by using the reinforcing bead of the tank, the widened shape can be easily secured, and the structure becomes compact. In other words,
By making the concave portion a reinforcing bead of the tank, the reinforcing bead can be made multifunctional.

[0014] Further, the detour shape of the continuous welded portion makes it possible to minimize the flange width as much as possible. In other words, the flange general portion can be set to the minimum width required for normal welding, while the projecting pieces other than the general portion can also minimize the projecting dimension by the detour shape, In this way, interference with peripheral members can be easily avoided.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing an embodiment of the present invention.

FIG. 2 is a three-dimensional view of that of FIG.

FIG. 3 is a partial plan view showing another embodiment.

FIG. 4 is a partial vertical sectional front view showing a conventional technique.

FIG. 5 is a partial plan view showing a mounting portion of FIG. 4;

[Explanation of symbols]

 2, 3 tank member 4, 5 flange 9 mounting hole 6 continuous welded portion 1 fuel tank 14 detour portion 16 side portion 17 concave portion 18 widened portion

Claims (3)

[Claims] 1. A type in which a flange of a divided tank member is overlapped and the overlapped portion is continuously welded, and a mounting hole of a tank is drilled in the overlapped flange. Increase the distance between the part and the mounting hole,
Thus, the stress transmitted from the mounting hole to the continuous welded portion is reduced. 2. The mounting structure for a fuel tank according to claim 1, wherein the continuous welding portion has a shape bypassing the mounting hole. 3. The fuel tank according to claim 2, wherein in order to obtain a detour shape of the continuous welded portion, a concave portion is provided on a side portion of the tank, and the width of the flange near the mounting hole is increased. Mounting part structure.