KR19980022328U - Rigid Structure of Fuel Tank Lower Member - Google Patents

Abstract

The rigid structure of the lower portion of the fuel tank, the upper member and the lower member is configured to be joined, the lower member in the rigid structure of the fuel tank lower member is formed bead, the central portion of the lower member 10 The first bead 11, the second bead 12, and the third bead 13, the fourth bead 14, the fifth bead 15, and the sixth bead 16 are symmetrically distributed to each other. Characterized in that it is formed, the stress is generally dispersed throughout the lower member, there is an advantage that the cracks due to stress concentration is prevented to improve durability.

Description

Rigid Structure of Fuel Tank Lower Member

The present invention relates to a rigid structure of a fuel tank lower member, and more particularly, it is possible to change the distribution of beads formed in the lower member of the fuel tank to provide prevention of cracking due to stress and improvement of durability. To a rigid structure of a fuel tank lower member.

Essentially a vehicle using liquid fuel, such as gasoline or diesel, is equipped with a fuel tank 1 as shown in FIG. Fuel is supplied to drive the engine.

In addition, such a general fuel tank is formed of the upper member (1a) and the lower member (1b) is formed by welding or by any other method.

In particular, since the lower member 1b of the fuel tank 1 has an important influence on the overall rigidity of the tank, it should be excellent in durability. Accordingly, as shown in FIGS. 2 and 3, the bottom of the lower member 1b includes a plurality of beads (eg, first bead 2a, second bead 2b, and third bead 2c) for rigidity. ) And the fourth bead 2d are formed and the distance between the first bead 2a and the second bead 2b and the distance between the third bead 2c and the fourth bead 2d are the same. The width of each bead was found to be approximately 45 mm.

However, despite the individual beads 2a, 2b, 2c, and 2d formed for such stiffness, the overall rigidity of the lower member 1b has been found to be weak in practice, which is particularly stressed at the center of the lower member 1b. It was found that cracking occurred due to the maximum stress concentrations occurring in the region (A) of the stress concentration part, which is particularly concentrated. Accordingly, there is a problem that the overall durability of the lower member (1b) is lowered and the productability is lowered by reducing the lifetime.

Therefore, the present invention has been devised to solve these problems, and an object of the present invention is to provide a rigid structure of the fuel tank lower member having improved durability by changing the width and distribution structure of the bead.

1 is a perspective view showing the structure of a typical fuel tank.

2 is an analytical plan view showing a stress distribution of a conventional fuel tank lower member.

3 is a cross-sectional view taken along line III-III of FIG. 2;

4 is an analytical plan view showing the stress distribution of the lower member of the fuel tank according to the present invention.

5 is a cross-sectional view taken along the line VV of FIG. 4.

6 is an enlarged cross-sectional view taken along the line VI-VI of FIG. 4.

Explanation of symbols for the main parts of the drawings

1: fuel tank 10: lower member

11: first bead 12: second bead

13: 3rd Bead 14: 4th Bead

15: fifth bead 16: sixth bead

This object is achieved by a preferred embodiment of the present invention, according to one aspect of the present invention, the upper member and the lower member is configured to be bonded, the lower member is a rigid structure of the fuel tank lower member is formed bead The fuel tank for the fuel tank, characterized in that the first bead, the second bead and the third bead, and the fourth bead, the fifth bead and the sixth bead are formed symmetrically about the central portion of the lower member. Rigid structure of the lower member.

According to another aspect of the present invention, the first bead, the second bead, the fourth bead and the fifth bead has the same width, the third and sixth fuel tank, characterized in that the same width Rigid structure of the lower member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a plan view showing a stress distribution of the lower member according to the present invention, Figure 5 and Figure 6 is a cross-sectional view showing the distribution structure and the overall structure of the bird of the lower member according to the present invention.

4 to 6, the lower member 10 of the fuel tank according to the present invention includes a plurality of beads, that is, a first bead 11, a second bead 12, a third bead 13, and a fourth bead. Beads 14, fifth beads 15 and sixth beads 16 are formed. Also, the first bead 11, the second bead 12, and the third bead 13, the fourth bead 14, the fifth bead 15, and the sixth bead 16 are formed of the lower member 10. It is preferably provided at a position symmetrical about the central axis. In more detail, the first bead 11, the second bead 12, the fourth bead 14 and the fifth bead 15 have the same width, for example, 30 mm, respectively, 13 and the sixth boil 16 have a width of 40 mm. Of course, each of these feed widths may be set differently depending on the type of vehicle applied.

In addition, each bead 11-16 has recesses formed at both ends thereof. For example, in the case of the third bead 13, recesses 13a and 13b are formed at both ends thereof.

Referring to the stress distribution of the lower member 10 of the fuel tank according to the present invention, the stress is distributed substantially uniformly throughout the lower member 10 as shown in bold in FIG. As a result, the stress can be concentrated at one point, thereby preventing it from becoming fragile.

It is understood that this is because the number of beads is increased compared to the conventional lower member while being distributed at the optimum interval and position. In fact, as a result of testing the durability of the lower member 10 according to the present invention, as a result of applying the depressurizing pressure to the lower member repeatedly, cracking occurred at a maximum of 110,300 cycles. This demonstrates that the durability is significantly improved compared to the conventional 275 cycles.

As a result, when the lower member having the rigid structure according to the present invention is used for manufacturing the fuel tank, it is generally uniformly distributed without concentration of stress, thereby increasing durability and extending the life, thereby improving productivity and productability.

Although a preferred embodiment according to the present invention has been described above, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the appended claims.

Claims (2)

In the rigid structure of the lower member for the fuel tank in which the upper member and the lower member are joined, and the bead is formed in the lower member, the first bead 11, the second centering around the central portion of the lower member 10 The lower member for the fuel tank, characterized in that the bead 12 and the third bead 13, the fourth bead 14, the fifth bead 15 and the sixth bead 16 are formed symmetrically dispersed. Rigid structure. The method of claim 1, wherein the first bead 11, the second bead 12, the fourth bead 14 and the fifth bead 15 have the same width, the third bead 13 and the third bead Stiff structure of the lower member for the fuel tank, characterized in that the six beads (16) have the same width.