JPH0321342Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the lower body structure of automobiles, and in particular,
This invention relates to the structure of a connecting portion between a side sill and a side frame that extend in the longitudinal direction of the vehicle body.

(Prior Art) The lower body structure of an automobile has the function of supporting the engine, transmission, front and rear suspensions, etc., or dispersing external forces transmitted from the wheels to the body structure. is required.

An example of a lower body structure of a general passenger car is a side sill that extends in the longitudinal direction of the vehicle on both sides of the vehicle, and a side frame that extends in the longitudinal direction of the vehicle on the inside of the side sill in the vehicle width direction. Some side frames are connected to each other by torque boxes and cross members arranged at intervals in the front-rear direction. For example, Japanese Utility Model Application Publication No. 58-39377 shows an example in which this type of lower body structure is adopted in the front part of the vehicle body. There are also known examples in which a similar structure is adopted at the rear of the vehicle body.

The reason why the side sill and the side frame are connected by the cross member and the torque box is to increase the rigidity of the connection between the two, but in this conventional structure, the connection between the side sill and the side frame is Due to insufficient rigidity, the quadrilateral structure consisting of the side sills, side frames, cross members, and torque box may undergo shear deformation or vibration due to external forces in the longitudinal or lateral directions or torsional forces. The side sill and side frame may move differently in response to the load. Therefore, such a connection requires sufficient rigidity and strength to withstand such forces.

(Objective of the invention) An object of the invention is to solve the problems of the prior art and to provide a highly rigid connection structure between a side sill and a side frame.

(Structure of the Invention) In order to achieve the above object, the lower body structure of the automobile of the present invention includes a side sill extending in the longitudinal direction of the vehicle body on both sides of the vehicle width direction, and a side sill extending in the longitudinal direction of the vehicle body on the inside of the side sill in the vehicle width direction. and a side frame extending in the vehicle width direction are connected by a torque box spanning in the vehicle width direction, and a cross member extending in the vehicle width direction with a distance in the front and rear direction from the torque box is connected to the side sill and the side frame. The lower body structure of an automobile includes a reinforcing member connected to each of a side sill, a side frame, a torque box, and a cross member, the front side of the reinforcing member in the longitudinal direction of the vehicle body is connected to the cross member, and the rear side of the reinforcing member in the longitudinal direction of the vehicle body is connected to the torque box. The outer side in the vehicle width direction is connected to the side sill, and the inner side in the vehicle width direction is connected to the side frame.

(Example) Examples of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment in which the present invention is applied to a rear vehicle body. In FIG. 1, reference numeral 11 is a floor panel that constitutes the rear floor portion of the vehicle compartment. As shown in FIGS. 1 and 3, this floor panel 11 includes sloped parts 11a and 11b that slope upward toward the rear of the vehicle body, a horizontal part 11c between the sloped parts 11a and 11b, and a sloped part 11b.
It has a horizontal portion 11d extending rearward from the bottom. As shown in FIGS. 1 and 4, an inner panel 12a of a side sill 12 extending in the longitudinal direction of the vehicle body is fixed to the outer end of the floor panel 11 in the vehicle width direction. The upper and lower ends of the inner panel 12a have horizontal portions 12b and 12c bent toward the outer side at a substantially right angle, and flange portions 12d and 12e bent in the vertical direction from the tips of these horizontal portions, respectively. side sill 12
The outer panel (not shown) is connected to the outer panel (not shown). Further, the upper surface of the horizontal portion 12b is at approximately the same height as the lower surface of the horizontal portion 11d of the floor panel, and the horizontal portion 11d of the floor panel is overlapped and fixed by welding to the upper surface of the horizontal portion 12b.

A rear side frame 13 is arranged on the lower surface side of the horizontal portion 11d of the floor panel 11.
This rear side frame 13 has side sills 12
It extends parallel to the side sill 12 on the inside in the vehicle width direction. This side frame 13 has a substantially inverted hat-shaped cross section, and has flanges 1 at the ends of both side surfaces 13a and 13b extending upward from the bottom surface 13e.
3c and 13d. These flanges 13
c and 13d are fixed to the lower surface of the floor panel 11 by welding, and the side frame 13 and the floor panel 11 form a closed cross section. Also,
This side frame 13 has a bottom surface 13e inclined forward and downward at the front end portion and then extends horizontally forward again, and the flanges 13c and 13d are connected to the flange 11.
It is inclined forward and downward along the inclined part 11b. Further, below the horizontal portion 11d of the floor panel 11, an inner panel 1 of the side sill 12 is provided.
A torque box 14 is disposed spanning between the side frame 13 and the torque box 2a. As shown in FIG. 5, this torque box has a substantially inverted hat-shaped cross section, and has a bottom surface 14a at the end in the longitudinal direction of the vehicle body.
The front and rear walls 14 are bent upward at a substantially right angle from
b, 14c, and flanges 14 extending in the front and rear direction are provided on the upper edges of the front and rear walls 14b, 14c, respectively.
d, 14e are formed. torque box 1
A flange 14f bent upward is formed at the outer end in the vehicle width direction of the bottom surface 14a of No. 4, and the inner end in the vehicle width direction is located at approximately the same position as the inner ends of the front and rear walls 14b and 14c. Further, a flange 14g bent forward is formed at the outer end of the front wall 14b, and flanges 14h and 14i bent backward are formed at the inner and outer ends of the rear wall 14c, respectively. The torque box 14 has flanges 14d and 14e on the lower surface of the horizontal portion 11d of the floor panel 11.
g, 14f, 14i are attached to the side sill inner panel 12a, and the flange 14h is attached to the side frame 13.
are attached to the side walls 13a of each by welding.

On the other hand, a cross member 15 is attached to the upper surface of the floor panel 11. As shown in FIG. 6, this cross member 15 has a top surface 15a and a top surface 15a.
The front wall 15b has a front wall 15b extending downward from the front end of the vehicle, and a rear wall 15c extending downward from the rear end of the vehicle. A flange 15e is formed. back wall 15
At the lower end of c is a flange 15 bent backward.
f is formed, and this flange 15f is connected to a flange 15g formed at the outer end of the cross member 15. The cross member 15 has a flange 15d attached to the horizontal portion 11c of the floor panel 11, and a flange 15d attached to the horizontal portion 11c of the floor panel 11.
5f are each fixed to the horizontal portion 11d of the floor panel 11 by welding. Also, flange 1
5e is fixed to the inner surface of the side sill inner panel 12a, and the flange 15g is fixed to the upper surface 12b of the side sill inner panel 12a by welding.

A reinforcing member 16 is arranged below the floor panel 11. As shown in FIG. 2, this reinforcing member 16 includes a horizontal upper wall 16a, a front wall 16b extending downward from the front end of the upper wall 16a, a rear wall 16c extending downward from the rear end of the upper wall 16a, and an upper wall 16a
The front wall 16d has an outer wall 16d extending downward from the outer end in the vehicle width direction, and an inclined wall 16e connected to the lower edge of the front wall 16b and inclined outward and downward in the vehicle width direction. In front of the inclined wall 16e, a substantially triangular forward inclined wall 16f is formed, and in front of the inclined wall 16f, a panel portion 16g is formed outward in the vehicle width direction and slightly inclined downward. ing. back wall 1
The lower edge of 6c is inclined outward in the vehicle width direction, and a flange 16h is formed at the rear thereof. Further, a flange 16i is formed along the inner edge of the reinforcing member 16 in the vehicle width direction.
6i has a front end facing downward in a stepped manner so as to follow the shape of the bottom surface 13e of the side frame 13. A substantially linear flange 16j is formed on the reinforcing member 16 along the outer edge in the vehicle width direction. Furthermore, a substantially triangular upright wall 16k is formed in front of the panel portion 16g so as to extend upward, and a flange 16l that continuously extends forward is formed on the upper edge of the upright wall 16k. A flange 16m extending forward is formed at the outer end of the upright wall 16k in the vehicle width direction.

The height of the outer wall 16d extending downward from the upper wall 16a is equal to the vertical distance from the lower surface of the torque box 14 to the lower horizontal portion 12c of the side sill inner panel 12a.
The outer wall 16d is coupled to the lower surface of the bottom wall 14a of No. 4 and the inner surface of the side sill inner panel 12a in the vehicle width direction by spot welding or the like. The flange 16i is coupled to the lower surface of the bottom surface 13e of the side frame 13, and the flange 16j is coupled to the lower surface of the lower horizontal portion 12c of the side sill inner panel 12a by spot welding or the like. Furthermore, the front flange 16l is placed at a position facing the flange 15d of the cross member 15 and the floor panel 11, and
It is joined to the flange 15d by spot welding.
Flange 16m is side sill inner panel 1
It is welded to the inner side surface in the vehicle width direction of 2a.

In this manner, in the embodiment described above, the side sill 12, the side frame 13, the torque box 14, and the cross member 15 are connected by the reinforcing member 16 and are integrated. Therefore, the rigidity and strength of the connecting portion are improved, and the side sill and side frame do not exhibit different vibration characteristics, and the vibration characteristics of the two are equalized. Deterioration of noise vibration harshness (NVH) performance is prevented.

Further, in the above embodiment, the bottom surface 14a of the torque box, which is the mounting part of the rear suspension, is
is integrated with the protruding surface 16d of the reinforcing member 16, so that the rear suspension mounting portion can be strengthened.

In addition, as a structure for connecting the cross member 15 and the reinforcing member 16, in the above embodiment, the reinforcing member 16
The front flange 16l of the front flange 16l is connected to the flange 15d of the cross member 15 with the floor panel in between.A reinforcing member 16 is connected to the part of the floor panel 11 that forms a closed cross section with the cross member 15, Cross member 15 through part
Even if the reinforcing member 16 is connected to the reinforcing member 16, the same effect can be obtained.

(Effects of the invention) As explained above, according to the invention, at the connecting portion between the side sill and the side frame, there is a reinforcing member connected to each of these members and the torque box and cross member that connect the two members to each other. Since the reinforcing member is provided, it is possible to integrate each of these members, and the rigidity and strength of the connecting portion between the side sill and the side frame are improved. Thereby, the deformation of the connecting portion can be reduced, and the vibration characteristics of these two members can be made equal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a connecting portion between a side sill and a rear side frame in an embodiment of the present invention;
FIG. 2 is a perspective view showing the reinforcing member in FIG. 1;
Fig. 3 is a sectional view taken along the - line in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 is a perspective view showing the torque box. FIG. 6 is a perspective view of the cross member. 11...Floor panel, 12...Side sill,
13... Rear side frame, 14... Torque box, 15... Cross member, 16... Reinforcement member, 16a, 16d, 16i, 16j, 16l,
16m...Flange.

Claims (1)

[Scope of Claim for Utility Model Registration] Side sills extending in the longitudinal direction of the vehicle body on both sides of the vehicle width direction, and side frames extending in the longitudinal direction of the vehicle body on the inner side of the side sills in the vehicle width direction, which are bridged in the vehicle width direction. A lower body structure of an automobile, in which a cross member is connected to the side sill and the side frame by a torque box and extends in the vehicle width direction with a distance in the longitudinal direction from the torque box, the side sill, the side frame, the torque A reinforcing member is connected to each of the box and the cross member, and the front side of the reinforcing member in the longitudinal direction of the vehicle body is connected to the cross member, the rear side of the reinforcing member in the longitudinal direction of the vehicle body is connected to the torque box, and the outer side in the vehicle width direction is connected to the side sill. A lower body structure for an automobile, wherein the inner side in the width direction is respectively connected to the side frame.