JP2571388B2 - Lower body structure of car - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower vehicle body structure of a motor vehicle which is excellent in high-speed traveling performance and has improved stiffness of a dash panel portion in a collision.

Prior art As a conventional lower body structure of an automobile, a floor frame extending in the front-rear direction, a front frame, a cross member extending in the width direction, and the like are provided outside the cabin on the lower surface of the floor panel, and the rigidity against a force applied in the vehicle front-rear direction is provided. In order to enhance the performance, a combination of a floor frame and a front frame is known (Japanese Utility Model Laid-Open No. 58-2174).

Problems to be Solved by the Invention However, when frames such as a floor frame and a front frame are provided outside the passenger compartment, these frames inevitably become resistance during traveling due to aerodynamics. In addition to the problem of lowering the vehicle height, which hinders high-speed driving, when a large force is applied in the vehicle longitudinal direction, such as during a collision, the dash panel becomes a weak point in strength, and the front frame is connected. However, there is a problem that the dash panel is deformed toward the interior of the vehicle and narrows the interior space of the vehicle.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lower vehicle body structure of an automobile which is excellent in high-speed running performance and has a significantly improved rigidity of a dash panel portion.

The object of the present invention is to provide a dash panel extending in a substantially horizontal direction from a substantially vertical direction in a vehicle front-rear direction. The rear end of the front frame having a closed cross-section having a rear end formed of a bevel is formed such that the upper end of the rear end of the front frame is joined to a portion of the dash panel extending in a substantially vertical direction. Combine
A floor frame having a closed cross section extending in the front-rear direction of the vehicle body is disposed on a surface on the vehicle interior side of the floor panel, and a front end portion of the floor frame is connected to the rear end portion of the front frame via the dash panel. A lower vehicle body structure of a combined vehicle, wherein a rear end of the front frame is positioned such that a part of a closed cross section of a rear end of the front frame is located within a closed cross section of a substantially horizontal extending portion of the floor frame. A lower end portion of the portion is coupled to a lower portion of a front end portion of the floor frame, and at a coupling portion between the front frame and the floor frame coupled via the dash panel, the dash panel is formed of the front frame. This is achieved by a lower body structure of an automobile characterized by being located in a wall shape between a closed cross section and a closed cross section of the floor frame. .

In the present invention, connecting the front end of the floor frame to the dash panel at a portion of the dash panel corresponding to the joint between the rear end of the front frame and the dash panel means that the front end of the dash panel is connected to the rear end of the front frame of the dash panel. The front end of the floor frame is connected to at least a part of the part of the dash panel on the opposite side of the part; and the floor frame is directly connected to at least a part of the rear end of the front frame via the dash panel. Is included. In terms of strength, it is desirable to directly connect the front frame and the floor frame via the dash panel.

Examples Hereinafter, based on the accompanying drawings, an embodiment of the present invention will be described.
Add a detailed explanation.

FIG. 1A is a schematic diagram showing a side configuration of a lower body structure of an automobile according to an embodiment of the present invention, and FIG. 1B is a schematic diagram showing a planar configuration thereof. FIG. 2 is a drawing showing a detailed structure before and after the dash panel, and FIG. 3 is a schematic diagram showing a structure near the dash panel.

1A, 1B, 2 and 3, in front of the dash panel 1, the lower surface is a floor panel 2
A front frame 3 having a closed cross section extending in the front-rear direction of the vehicle body is disposed so as to smoothly connect to an extension surface of the lower surface of the vehicle.
The rear end 3a is connected to the dash panel 1.
Also. On the upper surface of the floor panel 2 on the vehicle interior side, a floor frame 4 having a closed cross section extending in the front-rear direction of the vehicle body is provided, and a front end 4 a thereof is connected to the dash panel 1. In this embodiment, the rear end 3a of the front frame 3 and the front end 4a of the floor frame 4 are directly connected via the dash panel 1. The floor panel 2 forms a tunnel portion 5 in a central portion of the passenger compartment. 6a, 6b, 6c and 6d are cross members, and the front frame 3 extends forward and is a cross member.
6a, the floor frame 4 extends rearward and is connected to the cross members 6b, 6c. Reference numeral 7 denotes a front pillar, 8 denotes a side sill, and a rear frame 13 and a rear suspension frame 14 are provided behind the cross member 6c.

FIG. 4 is an end view showing details of a joint portion of the front frame 3, the dash panel 1, and the floor frame 4, and FIG. 5 is a sectional view taken along line AA. Also, the sixth
The figure is a schematic perspective view showing the structure of the rear end 3a of the front frame 3. As shown in FIG. 6, the rear end 3a of the front frame 3 is in contact with the front end 4a of the dash panel 1 and the floor frame 4 in order to increase rigidity against a longitudinal force applied to the vehicle body at the time of a collision or the like. A curved dash panel 1 extending from a substantially horizontal direction to a substantially vertical direction toward the front of the vehicle body so as to increase the area of the joint portion.
A smooth slope is formed rearward and downward along the shape of. The front end 4a of the floor frame 4 is connected to the rear end of the front frame 3 via the dash panel 1.
The rear frame 3 has a surface conforming to the shape of the dash panel 1 and the rear end 3a of the front frame 3 so that it can be firmly coupled to the front panel 3a. In front of the dash panel 1, the front frame 3 is connected to the wheel apron 9 at its side 3b as shown in FIG.

Although not shown in other drawings for the sake of convenience, the rigidity of the floor frame 4 is increased and the rigidity in the width direction of the vehicle body is improved as shown in FIG. 3 and FIG. To this end, the side portions of the floor frame 4 and the tunnel portion 5 are connected by a reinforcing frame 10 having a closed cross-sectional structure. Similarly, the rigidity of the front frame 3 is increased, and the rigidity in the vehicle width direction is also increased. To improve, the side of the front frame 3 is connected to the side sill 8 via a cowl side panel 12 by a reinforcing frame 11 having a closed cross-section structure.

In the present embodiment configured as described above, in the related art, the front frame 3 and the floor frame 4 that extend in the vehicle front-rear direction mainly apply the front-rear direction force applied to the vehicle body at the time of a collision or the like that was mainly received by the dash panel 1. Is combined with the dash panel 1 so that the front frame 3, the floor frame 4 and the dash panel 1 can share and receive the vehicle. Therefore, the rigidity against the longitudinal force applied to the vehicle body at the time of a collision or the like is greatly improved. Conventionally, it is necessary to increase the height of the closed section of the front frame 3 in order to reduce the load on the dash panel 1 against the force in the front-rear direction of the vehicle body. In this embodiment, the front frame 3 and the floor frame 4 are As shown in FIG. 5, the front frame 3 as well as the front frame 3 and the floor frame 4 can form a closed section having a sufficient height by being connected via the window panel 1. Therefore, the height of the closed cross section of the front frame 3 can be reduced, and the resistance during traveling can be significantly reduced. Furthermore, in this embodiment,
Since the front frame 3 is connected to the side sill 8 and the floor frame 4 is connected to the tunnel portion 5 by the reinforcing frames 11 and 10, respectively, the rigidity of the front frame 3 and the floor frame 4 can be increased, and The rigidity in the width direction can also be improved.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention described in the claims, which are also included in the scope of the present invention. Needless to say.

For example, in the above embodiment, the front frame 3 and the floor frame 4 are directly connected via the dash panel 1, but the front frame 3 and the dash panel 1, and the floor frame 4 and the dash panel 1
Even if they are separately connected to each other, the front frame 3, the dash panel 1, and the floor frame 4 can share and receive the longitudinal force applied to the vehicle body at the time of collision or the like, and Since the height of the closed cross-section structure of the joint can be made sufficiently large, the rigidity against the longitudinal force applied to the vehicle body at the time of a collision, etc. is greatly improved compared to the conventional lower body structure of a car. Can be.

Effect of the Invention According to the present invention, the lower surface of the vehicle body is formed by a flat surface, and the aerodynamic performance during traveling of the vehicle is improved, and the load from the front frame can be effectively shared to the floor frame, The rigidity of the dash panel is improved, and the dash panel can be prevented from being deformed.

[Brief description of the drawings]

FIG. 1A is a schematic diagram showing a side configuration of a lower body structure of an automobile according to an embodiment of the present invention, and FIG. 1B is a schematic diagram showing a planar configuration thereof. FIG. 2 is a drawing showing the detailed structure before and after the dash panel, and FIG.
It is the schematic which shows the structure near the dash panel. FIG. 4 is an end view showing details of a joint portion of the front frame 3, the dash panel 1, and the floor frame 4, and FIG. 5 is a sectional view taken along line AA. FIG. 6 is a schematic perspective view showing an example of the structure of the rear end of the front frame. FIG. 7 is a cross-sectional view showing an example of a state in which the front frame is connected to the vehicle body in front of the dash panel.
FIG. 8 is a sectional view taken along the line BB of FIG. 1 dash panel, 2 floor panel, 3 front frame, 3a rear end of front frame, 3b
…… Front frame side, 4 …… Floor frame,
4a: Front end of floor frame, 5: Tunnel, 6
a, 6b, 6c, 6d ... cross member, 7 ... front pillar, 8 ... side sill, 9 ... wheel apron, 1
0, 11 ... reinforcement frame, 12 ... cowl side panel, 1
3… Rear frame, 14… Rear suspension frame.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Kameshima 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Corporation (56) References JP-A-64-47683 (JP, A) JP-A-63 -306987 (JP, A) JP-A-62-105779 (JP, A) JP-A-63-247176 (JP, A) Fully open sho 59-160471 (JP, U) Really open sho 61-132163 (JP, U )

Claims (1)

(57) [Claims] A dash panel extending in a substantially horizontal direction from a substantially vertical direction in a front-rear direction of a vehicle body. The rear surface of the dash panel extends in a front-rear direction of the vehicle body and has a smooth inclined surface toward a rear lower portion along the shape of the dash panel. Connecting the rear end of the front frame having a closed cross section having an end portion such that an upper end portion of the rear end of the front frame is connected to a substantially vertically extending portion of the dash panel; A floor frame having a closed cross-section extending in the front-rear direction of the vehicle body is disposed on a surface on the vehicle interior side, and a front end of the floor frame is connected to the rear end of the front frame via the dash panel. The lower body structure of an automobile, wherein a part of a closed cross section of a rear end portion of the front frame is located within a closed cross section of a substantially horizontal extending portion of the floor frame. A lower end portion of a rear end of the front frame is coupled to a lower portion of a front end of the floor frame, and a dash panel is provided at a coupling portion between the front frame and the floor frame coupled via the dash panel. A lower body structure of an automobile, wherein the lower body structure is located between the closed cross section of the front frame and the closed cross section of the floor frame.