JPH0427749Y2 - - 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) Conventionally, as shown in the bottom view in FIG. 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. 188683/1983. 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, but the torque boxes 4 and 5 are formed by the front and rear vertical walls and the bottom wall. Since it has a cross-sectional shape of a dome and is open at the top, it tends to deform so that the top opens (opens) when subjected to stress, and has the disadvantage of lacking bending and torsional rigidity.

(Purpose of the invention) In view of the above-mentioned circumstances, an object of the present invention is to provide a lower body structure for an automobile that prevents the torque box from opening and improves bending rigidity and torsional rigidity.

(Structure of the invention) The present invention provides a seat support bracket with an inverted U-shaped cross section on the upper opening side of a torque box with a U-shaped cross section with the upper opening side, and this bracket is connected to the torque box. It is characterized in that it is joined to the front and rear vertical walls of the bracket, and these vertical walls are connected by the bracket.

(Effects of the invention) According to the invention, the front and rear vertical walls of the torque box are connected by the seat support bracket, which prevents the opening of the torque box from opening and improves the bending and torsional rigidity of the torque box. can be done. Furthermore, since the seat support bracket has an inverted U-shaped cross section, the support rigidity of the seat mounting member is high. Further, since the vertical wall portion of the bracket is attached to the vertical wall of the torque box by a connecting piece, resistance to changes in the cross-sectional shape of the torque box is large, and high rigidity can be obtained. Furthermore, since the bracket is fixed at a fixed position within the torque box, there is an advantage that the seat positioning accuracy is improved.

(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 a torque box 4 is connected between a floor frame 2 and a side sill 3 in the lower vehicle body structure of the present invention. The side sill 3 has a closed cross section 12 due to the butt joining of the side sill outer 10 and the side sill inner 11.
One end of the torque box 4 is joined to the side sill inner 11, and the other end is joined to the floor frame 2. The floor frame 2 is joined to the lower surface of the floor panel 1 to form a closed cross section 13.

As is particularly clear from FIG. 3, the torque box 4 is open at the top and bent to have a shaped cross section, and has a vertical wall 14 on the front side of the vehicle body, a vertical wall 15 on the rear side of the vehicle body, and a bottom wall 16. The ends of the vertical walls 14, 15 on the side sill 3 side and the ends on the floor frame 2 side are bent at almost right angles to form joint flanges 14a, 15a joined to the side surfaces of the side sill inner 11 and the floor. Joint flange 14b, 1 joined to the side surface of frame 2
5b respectively. Further, at both ends of the bottom wall 16, there are joining flanges 16b extending substantially horizontally.
16b is formed, and the side sill inner 1
1 and the bottom surface of the floor frame 2, respectively. Further, the upper ends of the vertical walls 14 and 15 are bent at approximately right angles to form joint flanges 14c and 15c that are joined to the lower surface of the floor panel 1, and the torque box 4 forms a closed section 17 together with the floor panel 1. ing.

Reference numeral 20 denotes a seat mounting member extending in the vehicle width direction on the floor panel 1. This seat mounting member 20 is disposed in the torque box 4 on the lower surface of the floor panel 1, and is attached to a seat supporting bracket 22 to which a nut 21 is fixed. Attach bolt 2 to nut 21 above.
3 is attached to the floor panel 1 by screwing.

As is clear from FIG. 4, the bracket 22 includes a flat top wall portion 24 in contact with the lower surface of the floor panel 1, and a pair of vertical wall portions 25, 26 bent downward from both sides of the top wall portion 24. It is formed in an inverted U-shape in cross section. A through hole 27 for a bolt 21 is provided in the top wall portion 24, and a nut 21 is fixed to the lower surface of the top wall portion 24 in alignment with the hole 27. vertical wall portion 25 of the bracket 22;
At 26, there are joint pieces 25a, 25b and 26 bent at approximately right angles from these vertical walls 25, 26.
a and 26b are formed respectively, and the joint piece 2
5a, 26a are joined to the inner surface of the vertical wall 14 on the front side of the vehicle body of the torque box 4, and the joining pieces 25b, 26
b is joined to the inner surface of the vertical wall 15 on the rear side of the vehicle body of the torque box 4, so that the bracket 22 is fixed inside the torque box 4, and both vertical walls 1
4 and 15 are connected.

In this way, the vertical walls 1 at the front and rear of the torque box 4
Since the seat support bracket 22 connects the seats 4 and 15, the opening of the torque box 4 is prevented, and the bending rigidity and torsional rigidity of the torque box 4 can be improved. Further, since the seat support bracket 22 has an inverted U-shaped cross section, the support rigidity of the seat mounting member 20 is high. Further, the vertical wall portions 25 and 26 of the seat support bracket 22 are attached to the joint piece 25.
Since it is attached to the vertical walls 14, 15 of the torque box 4 by a, 25b, 26a, 26b,
The resistance to changes in the cross-sectional shape of the torque box 4 is large, and high rigidity can be obtained. Furthermore, the seat support bracket 22 is connected to the torque box 4.
Since the seat is fixed at a fixed position within the seat, the positioning accuracy of the seat is also improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the main parts of the lower body structure of an automobile according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a side view, and Fig. 4 is a view of the seat support bracket. The perspective view and FIG. 5 are bottom views showing a conventional lower vehicle body structure. 1...Floor panel, 2...Floor frame,
3... Side sill, 4... Torque box, 10
... Side sill outer, 11... Side sill inner, 12, 13, 17... Closed section, 14, 1
5... Vertical wall of the torque box, 16... Bottom wall of the torque box, 20... Seat mounting member, 21...
... Nut, 22 ... Seat support bracket, 2
3... Bolt, 25a, 25b, 26a, 26b
...joint piece.

Claims (1)

[Claims for Utility Model Registration] A floor frame 2 joined to the lower surface of the floor panel 1 of the vehicle body and extending in the longitudinal direction of the vehicle body; In the lower body structure of an automobile, in which an extending side sill 3 having a closed cross-section shape is connected by a torque box 4 having a U-shaped cross-section and having an upper opening side and having front and rear vertical walls 14, 15 and a bottom wall 16, A seat support bracket 22 is disposed on the upper opening side of the torque box 4, and the bracket 22 has a flat top wall portion 24 in contact with the lower surface of the floor panel 1, and a flat top wall portion 24 in the vehicle width direction of the top wall portion 24. A pair of vertical walls 25, 2 bent downward from both sides of
6, and is formed in an inverted U-shape, and furthermore, the pair of vertical wall portions 25, 26 are bent from both sides of the vertical wall portions 25, 26 in the longitudinal direction of the vehicle body at approximately right angles in the vehicle width direction. joined pieces 25a, 25b,
26a, 26b are respectively formed, and these joint pieces 25a, 25b, 26a, 26b are joined to the front and rear vertical walls 14, 15 of the torque box 4, and the bracket 22 is connected between the vertical walls 14, 15.
An automobile lower body structure characterized by being connected by.