JPH0617670Y2 - Lower car body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lower vehicle body structure of an automobile, and more particularly to a structure near a joint between a floor panel and various frames in a lower body of the vehicle.

(Prior Art) As a lower body structure of a conventional automobile, a front floor frame, a rear floor frame, a cross member extending in the vehicle body lateral direction, and the like extending in the vehicle body front-rear direction are arranged outside the cabin on the lower surface of the floor panel. It is known that a front floor frame and a rear floor frame are connected to each other in order to increase the rigidity against the force applied to the vehicle (Japanese Utility Model Publication No. 56-46474).

Further, Japanese Patent Laid-Open No. 58-128970 discloses a structure in which a front floor frame and a rear floor frame are attached to side sills provided at both edges of a floor panel. Further, in the disclosed structure, the suspension mounting bracket is provided at the connecting portion of the frames.

(Problems to be Solved by the Invention) The vehicle body structure disclosed in the above-mentioned prior art has a certain effect of improving rigidity of the vehicle body by connecting various frames to strengthen the integrity of the frames. It is a thing. However, although these known structures have the effect of strengthening the integrity in two dimensions, they are insufficient in the reinforcing effect in three dimensions. In addition, since all of them have a structure in which the frames are arranged under the floor panel, aerodynamically, these frames inevitably resist when driving, and also become a constraint on lowering the vehicle height, which reduces the running performance. There is a problem of blocking.

(Means for Solving the Problems) The present invention is configured in view of the above circumstances, and can sufficiently improve the rigidity of the lower portion of the vehicle body, particularly in the vicinity of the coupling portion of the frames, and further, improve the aerodynamic performance. An object of the present invention is to provide an underbody structure that can be improved.

The object of the present invention is to provide a floor panel that constitutes a bottom wall of a passenger compartment, a side sill arranged at a side end portion of the floor panel so as to extend in the vehicle front-rear direction, and a floor sill on the floor panel substantially parallel to the side sill. A front floor frame which is provided so as to extend in the front-rear direction and whose rear end is connected to a cross member at a side edge portion of the floor panel; and a front end which is provided on the floor panel so as to extend in the vehicle front-rear direction and has a rear end of the side sill at the front end portion. A rear floor frame continuously connected to the rear floor frame, and a substantially closed space below the floor panel corresponding to a region substantially including a connection portion between the rear end portion of the front floor frame, the side sill, and the rear floor frame. And a panel member joined to the lower surface of the floor panel so as to form the rear floor frame and a side sill. The present invention is achieved by providing a lower body structure of an automobile, characterized in that a suspension frame mounting portion, that is, a bracket is provided at a portion of the panel member where the closed cross-section structure is located. To be done. In this case, it is preferable to dispose the bracket in the space formed by the panel member and the floor panel in terms of strength and aerodynamic performance.

(Effect of the Invention) According to the present invention, with the above-described configuration, the rigidity of the vehicle body lower structure can be improved not only two-dimensionally but three-dimensionally.

Further, in the configuration of the present invention, since the frame members are not arranged outside the floor panel and the panel member is exposed, the aerodynamic performance can be improved.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial plan view of the lower panel structure of the vehicle body as viewed from the vehicle compartment side.

FIG. 2 is a side view thereof.

Referring to FIG. 1 and FIG. 2, a floor panel 1 which constitutes a bottom wall of a vehicle compartment is disposed in a lower portion of a vehicle body, and a transmission and a propeller shaft connected to the transmission are disposed in a central portion of the floor panel 1. A tunnel portion 2 for accommodating the is formed.

A front seat 3 and a rear seat 4 are mounted on the floor panel 1, and a front floor frame 6 extending in the front-rear direction is arranged on the upper surface thereof. The rear end portion of the front floor frame 6 is connected to a cross member 7 extending in the vehicle body lateral direction at a position slightly ahead of the rear wheel 5.

A side sill 8 is arranged at a side edge portion of the floor panel 1 so as to extend in the front-rear direction.
Are connected near the rear end of the side sill 8 at both ends. Further, on the floor panel 1, a rear floor frame 9 extending behind the side sill 8 is attached.

Another cross member 10 is arranged at the rear of the vehicle body so as to be substantially parallel to the axle of the wheel 5.

FIG. 3 is a partial perspective view of the vicinity of the connecting portions of the various frames described above as viewed from below.

Referring also to FIG. 3, the connecting portions of the front floor frame 6, the cross member 7, the side sills 8, and the rear floor frame 9 are relatively close to each other, and the lower surface of the floor panel 1 is corresponding to this area. A panel member 11 is attached to the.

In this case, since the floor panel 1 rises in a stepwise manner toward the rear, the front end of the panel member 11 is attached so as to be continuous with the lower surface of the floor panel 1, and the rear end portion is bent upward so that the upper end is fixed to the floor panel. When attached to the lower surface of the floor panel 1, the panel member 11 forms one closed space below the floor panel 1 together with the lower surface of the floor panel 1.

Further, in the upper side of the panel member 11, that is, in the closed space, the bracket 12 for mounting the rear suspension is provided.
Are arranged and fixed to the panel member 11 and the floor panel 1.

The bracket 12 is provided with a mounting pin 13 protruding below the panel member 11, and the rear suspension frame 15 is mounted to the mounting pin 13 via a mount rubber 14. Further, the rear end side of the rear suspension frame 15 is connected via a mount rubber 16 to a bracket 17 attached to the lower end side of the cross member 10.

In the configuration of this example, the frames are arranged on the upper side of the floor panel 1, that is, on the passenger compartment side, and below the floor panel 1,
Substantially only the panel member 11 is arranged. Therefore, in this example, the aerodynamic performance can be improved as compared with the structure in which the frame is arranged in the lower portion of the floor panel 1.

And each of the above frames, the front floor frame 6,
Cross member 7, Side sill 8, Rear floor frame 9
Are connected to each other at positions close to each other, so that the structural integrity can be enhanced and the floor panel 1
Since the panel member 11 is attached to the lower part of the so as to form a closed space, not only the rigidity in the horizontal plane but also the rigidity in the vertical direction can be improved.

Further, in this example, the bracket 12 for the suspension 15 is provided in the closed space formed by the upper surface of the panel member 11 and the lower surface of the floor panel, but this portion has sufficient strength as described above. Have. Therefore, it is possible to provide a stable suspension support structure by utilizing the structure having high rigidity obtained by the above configuration.

Further, by providing the bracket 12 in this portion, the effect of further improving the rigidity of the vehicle body structure can be obtained. That is, by arranging the suspension support bracket 12 in the closed space, a synergistic rigidity improving effect can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a lower body structure of an automobile according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a partial perspective view of the vicinity of a joint portion of frames and the like seen from below. is there. 1 ... Floor panel, 2 ... Tunnel part, 3 ... Front seat, 4 ... Rear seat, 5 ... Wheels, 6 ... Front floor frame, 7 ... Cross member, 8 ... Side sill, 9 ...... Rear floor frame, 10 ...... Cross member, 11 ...... Panel member, 12 ...... Rear suspension mounting bracket, 1
3 ... Mounting pin, 14 ... Mount rubber, 15 ... Rear suspension frame, 16 ... Mount rubber, 17 ... Bracket.

Claims (1)

[Scope of utility model registration request] 1. A floor panel constituting a bottom wall of a vehicle compartment, a side sill arranged at a side end portion of the floor panel so as to extend in the vehicle front-rear direction, and a front-rear direction on the floor panel substantially parallel to the side sill. A front floor frame whose rear end is connected to a cross member at a side edge portion of the floor panel, and a front end which is provided on the floor panel so as to extend in the front-rear direction of the vehicle body and is continuous with the rear end of the side sill at the front end. And a rear floor frame connected to each other, and a region substantially including a connection portion between the rear end portion of the front floor frame, the side sill, and the rear floor frame forms a substantially closed space under the floor panel. And a panel member joined to the lower surface of the floor panel, the rear floor frame and the side sill have a closed cross section. With constituting the granulation, the position portion of the closed cross section of the panel member, the lower vehicle body structure, wherein the mounting portion of the suspension frame is provided.