JPH088949Y2 - Rear body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rear vehicle body structure such as a passenger car.

(Prior Art) A conventional rear body structure has a general surface, a rear floor pan having a continuous seat pan in front of the general surface through a vertical wall surface, and a rear floor pan along both sides of the rear floor pan. It has a side frame with a hat-shaped cross section that forms a closed cross section along the vehicle body front-rear direction. Between the side frames provided on both sides, both ends are connected to the side frames in order to secure strength and rigidity against load repeatedly input from the left and right rear suspensions and to suppress elastic deformation and vibration of the rear floor pan. A cross-hat-shaped cross member that forms a closed cross section along the vehicle width direction in cooperation with the rear floor pan is provided (see Japanese Utility Model Laid-Open No. 60-81178). Furthermore, both ends of the vertical wall of the rear floor pan are also connected to the side frame, and a cross member that forms a closed cross section along the vehicle width direction is provided in cooperation with the vertical wall to further improve rigidity, and the rear seat is provided at the stiffening part. There are belt anchors and fixed fuel tanks.

(Problems to be Solved by the Invention) According to the above-mentioned conventional example, the side frames are arranged along both sides of the rear floor pan, and the side frames are connected by the cross members, whereby the vehicle body front-rear direction and the vehicle width direction. A closed cross section is formed along with to improve rigidity. However, since the rear floor pan is formed by bending the general surface and the seat pan so as to be continuous on the vertical wall surface, the side frame along the lower surface of the floor pan is also bent and the rear is offset upward. In addition, because the storage part of the spare tire is recessed on the general surface, the floor pan cross section becomes convex, and the vicinity of the vertical wall surface is easily deformed in the event of a rear collision, so that the rigidity of the entire vehicle body can be secured. Not enough. It also causes vibration and noise. In order to compensate for this, measures such as thickening the plate material of the component must be taken, which goes against the general tendency toward weight reduction.

The object of the present invention is to stiffen the vicinity of the vertical wall surface of the rear floor pan with components made of a relatively thin plate material, to suppress the deformation of the relevant part at the time of a rear-end collision, and to
Another object of the present invention is to provide a rear vehicle body structure which can reduce noise and can sufficiently receive loads from the rear seat belt anchor and the fuel tank.

(Means for Solving the Problem) The rear body structure of the present invention for achieving the above object is
A general surface and a rear floor pan having a seat pan that is continuous below the general surface via a floor pan vertical wall surface, and a closed cross section along the vehicle front-rear direction in cooperation with the rear floor pan along both lower surface sides of the rear floor pan. A vehicle body structure comprising: a pair of side frames to be formed; and a cross member whose both ends are connected to the side frame and which forms a closed cross section along the vehicle width direction under the general surface in cooperation with the general surface. , Is installed between the floor pan vertical wall surface and the cross member, and the front end portion is coupled to the floor pan vertical wall surface from the upper end to the lower end of the floor pan vertical wall surface,
The rear end portion is connected to the front vertical wall surface of the cross member from the upper end to the lower end portion of the front vertical wall surface, and both upper end portions are connected to the lower surface of the general surface and in combination with the general surface. In the phosphorus hose section having a hat-shaped cross section that forms a closed cross section between the wall surface and the cross member, the rear seatbelt anchor attached to the joint between the vertical wall of the floor pan and the phosphorus hosement, and the phosphorus hose And the formed fuel tank mounting portion.

(Operation) The front end of the reinforcement is extended from the upper end to the lower end of the floor pan vertical wall to the floor pan vertical wall, and the rear end is extended from the upper end to the lower end of the front vertical wall of the cross member. In addition, the upper end portions are respectively connected to a general surface to form a closed cross section between the vertical wall surface of the floor pan and the cross member, so that the rigidity of the vehicle body is improved by restraining the shape of the vehicle body near the vertical wall surface of the floor pan. Further, the load acting on the rear seat belt anchor and the fuel tank is efficiently transmitted and dispersed to the rear floor pan and the cross member via the reinforcement.

Embodiment An embodiment of the rear body structure of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an essential part of a rear body structure of the present invention,
2 is a sectional view taken along the line AA in FIG. 1, and FIGS. 3 and 4 are enlarged sectional views taken along the line BB and CC in FIG. Is the rear floor pan.

The rear floor pan 1 is a general surface 1a which serves as a floor of a trunk room, a floor pan vertical wall surface 1b continuous to the front of this general surface 1a, a seat pan 1c extending forward from the lower end of the vertical wall surface 1b to support a seat 2, and a seat pan. A rising surface 1d that hangs down from the front end of 1c and a flat surface 1e that is continuously connected to the rising surface 1d and is connected to a front floor pan (not shown), and a general surface 1a is formed with a storage recess 1a 'for a spare tire t. I am doing it.

On the rising surface 1d of the rear floor pan 1, both ends are joined to the side sill inner 3, and a cross member 5 that forms a closed cross section along the vehicle width direction together with the rising surface 1d and that supports the front end of the fuel tank 4 is provided. is there.

A side frame 6 having a hat-shaped cross section along the lower surface of the rear floor pan 1 from the cross member 5 toward the rear of the vehicle body.
Are joined by spot welding to form a closed cross section that extends in the vehicle front-rear direction in cooperation with the rear floor panel 1.

Between the pair of side frames 6 arranged along both sides, both ends are joined to the side frames 6, and the lower surface of the general surface 1a of the rear floor pan 1 cooperates with the general surface 1a to close the cross section in the vehicle width direction. A cross-member 7 having a hat-shaped cross section is formed across.

A phosphorus reinforcement 8 having a hat-shaped cross section is provided between the vertical wall surface 1b of the floor pan and the cross member 7. The front end portion 8b of the phosphorus support 8 extends from the upper end to the lower end of the floor pan vertical wall surface 1b to the floor pan vertical wall surface 1b.
Further, the rear end portion 8a is connected to the front vertical wall surface 7a of the cross member 7 from the upper end to the lower end thereof by spot welding, and both upper end portions are welded to the lower surface of the general surface 1a. Together with the general surface 1a, a closed cross section extending between the floor pan vertical wall surface 1b and the cross member 7 is formed. Therefore, the floor pan vertical wall surface 1b and the front vertical wall surface 7a of the cross member 7 extend from the upper end to the lower end of the reinforcement 8 respectively.
The floor pan vertical wall surface 1b and the rear floor are connected to each other to form a closed cross section between the floor pan vertical wall surface 1b and the front vertical wall surface 7a of the cross member 7 by the linkage 8 and the general surface 1a of the rear floor pan 1. The general surface 1a of the bread 1 and the cross member 7 can be integrated, and the shape of the vehicle body at the portion is constrained to improve the rigidity.

The anchor 9 of the rear seatbelt 9a is attached to the joint between the floor pan vertical wall surface 1b and the front end 8b of the reinforcement 8 with a bolt b, and the load acting on the rear seatbelt 9a due to a collision or the like causes the anchor 9 and the reinforcement 8 to move. Through,
It is configured to be transmitted and distributed to the cross member 7 and the rear floor pan 1 so that the load can be sufficiently received.

On the other hand, at the lower end of the phosphorus reinforcement 8 is a fuel tank mounting part.
8c is formed, and the rear end of the fuel tank 4 is supported by the bolt b. By constructing the fuel tank 4 between the reinforcement 8 and the cross member 5 provided on the rising surface 1d, the periphery of the fuel tank 4 is stiffened by the cross members 5, 7, the reinforcement 8 and the side frame 6. Protected from deformation such as collision, and stiffened by the fuel tank 4 between the reinforcement 8 and the rising surface 1d,
Vibration and noise of the vehicle body can be reduced.

In addition, since the periphery of the fuel tank 4 and the periphery of the rear floor pan 1 are reinforced, deformation such as collision and reduction of vibration accompanying traveling can be obtained, so that the filler pipe 4a of the fuel tank 4 can be easily attached and routed. .

(Effect) According to the present invention, the floor pan vertical wall surface and the front vertical wall surface of the cross member are connected by the reinforcement from the upper end to the lower end, respectively, and the floor pan vertical wall surface and the front vertical wall surface of the cross member are connected. Since the closed section is formed by the reinforcement and the general surface of the rear floor pan, the vertical wall of the floor pan, the general surface of the rear floor pan, and the cross member can be integrated, and the vehicle body shape of the part is restrained. The rigidity at the time of a rear surface collision can be improved, the weight of the plate material of the component can be reduced without increasing the plate thickness, the cost can be reduced while maintaining the high strength, and the vibration and the noise can be reduced. Further, the fuel tank is prevented from being deformed, and the load acting on the rear seat belt anchor and the fuel tank can be transmitted and dispersed to the rear floor pan and the cross member via the reinforcement and the sufficient load can be received.

[Brief description of drawings]

1 is a plan view showing an essential part of a rear vehicle body structure of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIGS. 3 and 4 are B- in FIG. It is a principal part expanded sectional view which follows the B line and CC line. 1 …… Rear floor pan, 1a …… General surface, 1b …… Floor pan vertical wall surface, 4 …… Fuel tank, 6 …… Side frame,
7 ... Cross member, 7a ... Front vertical wall, 8 ... Linkagement, 8a ... Rear end, 8b ... Front end, 8c ... Fuel tank mounting part, 9 ... Rear seatbelt anchor.

Claims (1)

[Scope of utility model registration request] 1. A rear floor pan (1) having a general surface (1a) and a seat pan (1c) continuous below the general surface (1a) via a floor pan vertical wall surface (1b), and a rear floor pan (1). 1) A pair of side frames (6) that form a closed cross section along the front-rear direction of the vehicle in cooperation with the rear floor pan (1) along both sides of the lower surface of (1), and both ends are connected to the side frames (6), A floor pan vertical wall surface (1b), comprising a cross member (7) which is below the general surface (1a) and cooperates with the general surface (1a) to form a closed cross section along the vehicle width direction. And the cross member (7), the front end (8b) is joined to the floor pan vertical wall surface (1b) from the upper end to the lower end of the floor pan vertical wall surface (1b), and the rear end (8b). 8a) is below the upper end of the front vertical wall (7a) of the cross member (7) Is connected to the front vertical wall surface (7a), both upper ends are connected to the lower surface of the general surface (1a), and the floor pan vertical wall surface (1b) is crossed together with the general surface (1a). A ribbed reinforcement (8) having a hat-shaped cross section that forms a closed cross section between the member (7), and a rear seat attached to the joint between the vertical wall surface (1b) of the floor pan and the phosphorus reinforcement (8). A rear vehicle body structure comprising a belt anchor (9) and a fuel tank mounting portion (8c) formed in the phosphorus reinforcement (8).