JPH049273Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lower body structure of an automobile, and particularly to a structure in which a side sill and a floor frame are connected by a torque box.

(Prior art) As shown in the bottom view in FIG. 7, conventionally, a floor frame 2 is connected to the lower surface of a floor panel 1 of a vehicle body and extends in the longitudinal direction of the vehicle body, and a floor frame 2 is disposed on the side of the floor panel 1 and is connected to the bottom surface of a floor panel 1 of a vehicle body and extends in the longitudinal direction of the vehicle body. A vehicle body structure in which a frame 2 and a closed-section side sill 3 extending substantially parallel to each other are connected by torque boxes 4 and 5 extending in the vehicle width direction is known, for example, from Japanese Utility Model Application Publication No. 55-124368. Note that 6L and 6R are front wheels, and 7L and 7R are rear wheels.

Incidentally, the torque boxes 4 and 5 are joined to the floor frame 2 and the side sill 3 by joint flanges formed at both ends thereof, and the torque boxes 4 and 5 have a cross-sectional shape of . Since they are open, the joining flanges for the side sills 3 and the floor frame 2 can only be formed on the left, right, and lower sides of the ends of the torque boxes 4 and 5, which leaves something to be desired in terms of joint strength.

(Purpose of the invention) In view of the above-mentioned circumstances, the present invention provides an automobile lower body structure in which joining flanges to the side sill or floor frame at the end of the torque box are provided on all four sides, top and bottom, left and right, to improve the strength of the joint part. The purpose is to provide

(Structure of the invention) The lower vehicle body structure according to the invention includes a reinforcement that divides a torque box having a cross-sectional shape diagonally when viewed from the opening side of the torque box, and A joint flange is provided on either the side sill side or the floor frame side of the It is characterized by comprising a joining flange.

(Effects of the invention) By providing a reinforcement with a joint flange inside the torque box, the joints to the side sill or floor frame are now four, on the top, bottom, left and right, and the strength of the joint is increased. can be improved. Further, by providing the reinforcements diagonally within the torque box, the bending rigidity and torsional rigidity of the torque box are improved, and the load is easily distributed.

(Example) An example of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a state in which the torque box 5 in the lower vehicle body structure of the present invention is connected between the floor frame 2 and the side sill 3, and the torque box 5 is shown in a side view, a top view, and a front view, respectively. It is shown as. The side sill 3 forms a closed cross section 12 by butt joining of a side sill outer 10 and a side sill inner 11.
One end of the torque box 5 is joined to the side sill inner 11, and the other end is joined to the floor frame 2.

As is particularly clear from FIG. 4, the torque box 5 is open at the top and bent to have a cross-section in the shape of a square, thereby forming a side wall 13 on the front side of the vehicle body, a side wall 14 on the rear side of the vehicle body, and a bottom wall 15. At the end of each of these walls on the side sill 3 side, there is a joining flange 1 that is joined to the side surface of the side sill inner 11.
3a, 14a (however, the joint flange 13a is the joint flange 2 of the reinforcement 20, which will be described later).
1a) and 15a are bent from each wall 13, 14 and 15 at a substantially right angle, respectively. In addition, the floor frame 2 of torque box 5
At the side ends, there are joining flanges 13b and 14b that are joined to the side surfaces of the floor frame 2 (however, the joining flange 14b is attached to the reinforcement 2 which will be described later).
0 is joined to the floor frame 2 via the joint flange 21b) is bent from both side walls 13, 14 at a substantially right angle, and furthermore, the bottom wall 15 has a floor frame extending horizontally from the end thereof. 2
A joining flange 15b is formed to be joined to the bottom of the housing. Joining flanges 13c and 14c are formed at the upper ends of both side walls 13 and 14, respectively, to be joined to the lower surface of a floor panel (not shown), but the rear wheel side is upwardly disposed to accommodate the rear wheel suspension. Corresponding to the curved shape of the floor frame 2, the side wall 14 of the torque box 5 on the rear side of the vehicle body is taller than the side wall 13 on the front side of the vehicle body, and the upper joining flange 14c is oriented toward the floor frame 2 side. It is constructed in a shape that rises.

A reinforcement 20 is installed inside the torque box 15 and extends diagonally from the end of the side wall 13 of the torque box 5 on the side sill 3 side to the end of the side wall 14 on the floor frame 2 side when viewed from above. The upright wall 21 and the top wall 22 bent from the upper end of the upright wall 21 at a substantially right angle toward the side wall 14 of the torque box 5 form an inverted L-shaped cross section. Rainforcement 2
A joining flange 21a that is joined to the side surface of the side sill inner 11 is formed at the end of the upright wall 21 of 0 on the side sill 3 side, and a joining flange 13a of the side wall 13 of the torque box 5 is joined to the back surface of the joining flange 21a. be done. Further, a joining flange 21b is formed at the end of the upright wall 21 on the floor frame 2 side, and is joined to the side surface of the floor frame 2, and a joining flange 14b of the side wall 14 of the torque box 5 is joined to the back surface of the joining flange 21b. Ru. The lower edge of the upright wall 21 is joined to the upper surface of the bottom wall 15 of the torque box 5 by a joining flange 21c bent at a substantially right angle from the lower edge. Furthermore, as is clear from the cross-sectional views of FIGS. 5 and 6, the upright wall 21 is provided with a rib 21d parallel to its lower edge. Furthermore, a joining flange 22a that is joined to the side surface of the side sill inner 11 is formed at the end of the top wall 22 of the reinforcement 20 on the side sill 3 side. By being joined to the upper inner surface of the side wall 14 of the torque box 5, a closed cross-section 2 whose cross-sectional area decreases from the side sill 3 side toward the floor frame 2 side.
3 is formed between the torque box 5 and the torque box 5.

The above is the configuration of one embodiment of the present invention. In the above configuration, a side sill inner 1
By forming the joining flange 22a to be joined to the torque box 5, both side walls 1 of the torque box 5 are formed.
3, 14 and joint flanges 13a, 14a, 15 formed at the end of the bottom wall 15 on the side sill 3 side.
Together with a, it is possible to form joint flanges on all sides (up, down, left and right) to the side sill 3, which not only improves the rigidity of the torque box 5 but also improves the strength of the joint between the torque box 5 and the side sill 3. I can do it.

In addition, in this example, reinforcement 2
Although the top wall 22 of the reinforcement 0 is provided with a joining flange 22a to the side sill 3, it is also possible to configure the top wall of this reinforcement to be provided with a joining flange to the floor frame 2.

[Brief explanation of drawings]

Fig. 1 is a side view of the torque box in the lower body structure of the present invention, Fig. 2 is its plan view, Fig. 3 is its front view, Fig. 4 is its exploded view, and Figs. 7 is a bottom view showing a conventional lower vehicle body structure. 2...Floor frame, 3...Side sill, 5
...Torque box, 10...Side sill outer, 11...Side sill inner, 12, 23...
...closed cross section, 13, 14... side wall of torque box, 13a, 14a... joint flange, 15...
Bottom wall of torque box, 15a, 15b...Joining flange, 20...Reinforcement, 21
...Rainforcement upright wall, 21a, 2
1b, 21c...joint flange, 22...top wall of reinforcement, 22a, 22b...joint flange.

Claims (1)

[Claims for Utility Model Registration] A floor frame that is joined to the lower surface of a floor panel of a vehicle body and extends in the longitudinal direction of the vehicle body, and a closed cross-sectional shape that is disposed on the side of the floor panel and extends substantially parallel to the floor frame. In the lower body structure of an automobile, in which a side sill of a car is connected to a cross-sectional torque box, a reinforcement is provided inside the torque box to divide the torque box diagonally when viewed from the open side of the torque box, and the reinforcement is provided inside the torque box. A joining flange is provided on either the side sill side or the floor frame side of the forcement, and this joining flange and joining flanges formed on three sides of the ends of the torque box allow the forcement to be attached to the side sill or the floor frame. A lower body structure of an automobile characterized by comprising joining flanges on four sides.