JPH04310481A - Rear under body structure - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear underbody structure for an automobile, and more particularly to a rear underbody structure provided with a fuel tank.

0002

2. Description of the Related Art Conventionally, in the rear underbody structure of an automobile (four-wheel drive vehicle, FR vehicle) equipped with a differential gear for rear wheel drive, the space behind the rear seat is narrowed by the differential gear. In addition, in a car equipped with a differential gear for rear wheel drive, a seat cushion 80A of the rear seat 80 is installed as shown in FIG.
A rear underbody structure (Japanese Utility Model Application No. 62-52026) has been devised in which a fuel tank 82 is disposed at the lower part of the vehicle.

0003

However, in this rear underbody structure, the fuel tank 82
When the thickness N of the fuel tank 82 is increased in order to increase the capacity of the fuel tank 82, the space in the vehicle interior above the seat cushion 80A becomes narrower due to the fuel tank 82. For this reason, there was a problem in that it was difficult to increase the capacity of the fuel tank 82.

SUMMARY OF THE INVENTION In view of the above-mentioned facts, it is an object of the present invention to provide a rear underbody structure that can secure a sufficient space in the vehicle interior above the seat cushion and increase the capacity of the fuel tank.

[0005]

[Means for Solving the Problem] The invention as set forth in claim 1 is a rear underbody structure of an automobile body equipped with a differential gear for rear wheel drive, wherein The present invention includes a floor pan having a protruding portion, and a fuel tank disposed below the floor pan, spanning a space below the seat cushion and a space below the protruding portion of the floor pan. It is a feature.

[0006]

According to the first aspect of the invention, the fuel tank is disposed in the lower part of the floor pan, spanning the space below the seat cushion and the space below the protrusion of the floor pan. Therefore, the thickness of the front part of the fuel tank housed in the lower part of the seat cushion can be reduced, and a sufficient space in the vehicle interior above the seat cushion can be secured. In addition, since the fuel tank extends from the space below the seat cushion to the space below the protrusion of the rear floor pan, compared to the conventional structure where the fuel tank is placed only below the seat cushion as shown in Figure 6, The capacity of the fuel tank can be increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rear underbody structure according to the present invention will be described with reference to FIGS. 1 to 5.

In the figure, arrow FR indicates the forward direction of the vehicle body, and arrow UP indicates the upward direction of the vehicle body. As shown in FIG. 3, at both ends in the vehicle width direction of the rear underbody 10 of the automobile body of this embodiment, a rear floor side member light 14 and a rear floor side member left 16 are arranged substantially parallel to each other in the longitudinal direction of the vehicle body. It is provided.

As shown in FIG. 2, the rear floor side member light 14 and the rear floor side member left 16 each have a U-shaped cross section with their openings facing outward in the vehicle width direction. The rear floor side member lefts 16 are respectively arranged above the rear axle 18.

As shown in FIG. 3, the front part 14A of the rear floor side member light 14 is curved outward and downward in the vehicle width direction, and its front end is connected to the rocker light 18.
It is welded to the rear end of the vehicle from the inside in the vehicle width direction. Further, the front part 16A of the rear floor side member left 16 is curved outward and downward in the vehicle width direction, and the front end thereof is
It is welded to the rear end of the rocker left 20 from the inside in the vehicle width direction. Front part 14 of rear floor side member light 14
A and the front part 16A of the rear floor side member left 16
A fuel tank 24 is arranged between the two.

As shown in FIGS. 1 and 2, a rear floor pan 26 is disposed between the rear floor side member right 14 and the rear floor side member left 16. As shown in FIGS. As shown in FIG. 1, the front part 2 of the rear floor pan 26
At 8, a seat cushion 38 of the rear seat 30 is arranged. Moreover, the rear part 32 of the rear floor pan 26 is
It forms the bottom of the trunk room.

The middle portion of the rear floor pan 26 projects upward in the vertical direction of the vehicle body along the upper part of the fuel tank 24 to form a projecting portion 36, and the projecting portion 36 has a cross-sectional shape when viewed from the vehicle width direction. It is said to be shaped like an inverted U. The front part of the protruding part 36 of the rear floor pan 26 is a front vertical wall part 36A, and the rear part of the protruding part 36 of the rear floor pan 26 is a rear vertical wall part 36B.
There is a substantially horizontal plane portion 36C between the two.

As shown in FIG. 2, the rear floor pan 26
Both end portions in the vehicle width direction of the flat portion 36C of the protruding portion 36 are connected to the upper wall portion 14B of the rear floor side member light 14, respectively.
It is welded to the upper wall portion 16B of the rear floor side member left 16. In addition, the protrusion 3 of the rear floor pan 26
Both ends in the vehicle width direction of the front vertical wall portion 36A and the rear vertical wall portion 36B of 6 are connected to the inner wall portion 14C in the vehicle width direction of the rear floor side member right 14 and the rear floor side member left 16, respectively.
It is welded to the inner wall portion 16C in the vehicle width direction.

Therefore, the protrusion 36 of the rear floor pan 26
The front vertical wall portion 36A and the rear vertical wall portion 36B respectively connect the rear floor side member right 14 and the rear floor side member left 16 in a bulkhead shape.

As shown in FIG. 1, the fuel tank 2
The front portion 24A of No. 4 is disposed below the front portion 28 of the rear floor pan 26 along the front portion 28 of the rear floor pan 26, and has a thin shape with a small thickness in the vertical direction of the vehicle body. Further, the rear part 24B of the fuel tank 24 is disposed below the flat part 36C of the protrusion 36 of the rear floor pan 26 along the protrusion 36 of the rear floor pan 26.
The thickness of the vehicle body in the vertical direction is thicker than that of the front portion 24A. In addition, the front part 24A of the fuel tank 24
and the rear portion 24B of the fuel tank 24 are connected by a connecting portion 24C along the front vertical wall portion 36A of the protruding portion 36 of the rear floor pan 26.

As shown in FIG. 4, the fuel tank 2
A protrusion 25 that protrudes upward in the vertical direction of the vehicle body along the floor tunnel portion is formed at the center in the vehicle width direction of the front portion 24A of No. 4. A concave portion 27 is formed along the longitudinal direction of the vehicle body and recessed upward in the vertical direction of the vehicle body.

As shown in FIG. 3, the fuel tank 2
At the lower part of the rear part 24B of No. 4, a square-shaped rear subframe 52 is arranged in a plan view. The front part of this rear subframe 52 is a front cross member 52A with a closed cross-section structure extending in the vehicle width direction, and the rear part of the rear subframe 52 is a front cross member 52A with a closed cross-section structure extending in the vehicle width direction. It is referred to as a cross member 52B. The right side of the rear subframe 52 in the vehicle width direction is a light side member 52C that has a closed cross-sectional structure and extends in the longitudinal direction of the vehicle body along the front portion 14A of the rear floor side member light 14.
The left side portion of the rear subframe 52 in the vehicle width direction is a left side member 52D having a closed cross-sectional structure extending in the longitudinal direction of the vehicle body along the front portion 16A of the rear floor side member left 16.

As shown in FIG. 5, the rear subframe 5
A substantially central portion in the vehicle width direction of the front cross member 52A of No. 2 is curved downward in the vehicle body vertical direction, and this curved portion has a connection with a propeller shaft provided at the front portion of the rear differential gear unit 53. The coupling portion 53A is accommodated from above in the vertical direction of the vehicle body. Further, the propeller shaft is accommodated in a recess 27 at the bottom of the fuel tank 24 shown in FIG. The approximately center portion of the light side member 52C of the rear subframe 52 in the longitudinal direction of the vehicle body is
It is curved downward in the vertical direction of the vehicle body, and the drive shaft light 53B of the rear differential gear unit 53 is housed in this curved portion from above in the vertical direction of the vehicle body. Further, a substantially central portion of the left side member 52D of the rear subframe 52 in the longitudinal direction of the vehicle body is curved downward in the vertical direction of the vehicle body, and the drive shaft left 53C of the rear differential gear unit 53 is attached to this curved portion. It is housed from above in the vertical direction of the vehicle body.

As shown in FIGS. 1 and 3, a bracket light front 54 is provided on the inner side in the vehicle width direction near the front end of the front portion 14A of the rear floor side member light 14. The front end of the light side member 52C of the rear subframe 52 is attached from below in the vertical direction of the vehicle via a mount (not shown). Further, on the inner side in the vehicle width direction near the front end of the front part 16A of the rear floor side member left 16,
A bracket left front 56 is provided, and the front end portion of the left side member 52D of the rear subframe 52 is attached to the bracket left front 56 from below in the vertical direction of the vehicle body via a mount (not shown).

At the lower part of the front part 14A of the rear floor side member light 14 near the rear end, there is a bracket light rear 58.
A rear end portion of the light side member 52C of the rear subframe 52 is attached to the bracket light rear 58 from below in the vertical direction of the vehicle body via a mount (not shown). Further, a bracket left rear 59 is provided at the lower part near the rear end of the front part 16A of the rear floor side member left 16, and this bracket left rear 59 has a left side member of the rear subframe 52. The rear end portion of 52D is attached to the vehicle body from below in the vertical direction via a mount (not shown).

Next, the operation of this embodiment will be explained. In this embodiment with the above configuration, the fuel tank 24 is located under the rear floor pan 26 and in the space below the seat cushion 38 of the rear seat 30 and the protrusion 3 of the rear floor pan 26.
It is arranged astride the lower space of 6. Therefore, the thickness of the front portion 24A of the fuel tank 24, which is accommodated under the seat cushion 38 of the rear seat 30, can be made thinner, and a sufficient space in the vehicle interior above the seat can be secured. Furthermore, since the fuel tank 24 extends from the space below the seat cushion 38 of the rear seat 30 to the space below the protrusion 36 of the rear floor pan 26, the fuel tank as shown in FIG. 6 is placed only under the seat cushion. The capacity of the fuel tank 24 can be increased compared to the conventional structure.

Furthermore, in this embodiment, the rear overhang can be shortened, the overall length of the vehicle body can be shortened, and the rear floor can be shared between the four-wheel drive vehicle and the front-wheel drive vehicle.

[0023]

As described above, the present invention has the excellent effect of ensuring sufficient space in the vehicle interior above the seat cushion and increasing the capacity of the fuel tank.

[Brief explanation of drawings]

FIG. 1 is a side view showing a rear underbody structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;

FIG. 3 is a plan view showing the rear underbody structure of the embodiment of the present invention.

FIG. 4 is a perspective view of the fuel tank according to the embodiment of the present invention, as seen diagonally from the front of the vehicle body.

FIG. 5 is a perspective view of the rear subframe according to the embodiment of the present invention, viewed diagonally from the front of the vehicle body.

FIG. 6 is a side view showing a conventional rear underbody structure.

[Explanation of symbols]

10 Rear underbody 18 Rear axle 24 Fuel tank 24A Front 24B Rear 24C Middle part 26 Rear floor pan 30 Rear seat 36 Protruding part 36C　　　Plane part 38 Seat cushion 40 Seat back

Claims (1)

[Claims] Claim 1: A rear underbody structure of an automobile body equipped with a differential gear for rear wheel drive, comprising: a floor pan having a protrusion on the rear side of a seat back that protrudes upward in the vertical direction of the vehicle; and the floor pan. A rear underbody structure characterized by comprising: a fuel tank disposed at a lower part of a pan spanning a space below a seat cushion and a space below a protrusion of the floor pan.