JP3138175B2 - Rear body structure of vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rear body structure of a vehicle,
In particular, the present invention relates to an improved technology of a rear side member at a lower portion of a vehicle body floor and a seat mounting bracket.

[0002]

2. Description of the Related Art Conventionally, as a rear body structure of this kind,
For example, one described in Japanese Utility Model Laid-Open No. 63-89374 is known.

[0003] That is, on the lower surface of the rear floor panel, FIG.
1, a rear side member 1 extending in the vehicle front-rear direction, a rear parcel 2 and a side panel 3 connected to a front end portion and a front end outer portion of the rear side member 1, and a rear end portion of the rear side member 1 Rear cross members 4 fixed to the lower surface and extended in the width direction of the vehicle body are provided.

[0004] The rear side member 1 has a substantially U-shaped cross section with an upward opening, and has vertical walls 1a, 1b on both sides.
A flange portion is integrally provided on the upper edge of the seat, and a seat mounting bracket 6 is fixed to a bent portion 5 formed at a substantially central position in the front-rear direction. The seat mounting bracket 6 is for fixing an anchor plate or a striker of the rear seat, has a U-shaped cross section opened downward in cross section, and has both side pieces inside the opposed sides of the two vertical walls 1a, 1b of the rear side member 1. It is fixed to the upper position on the side by welding or the like. At the front and rear ends of the seat mounting bracket 6, bulkheads 7, 7 each having an L-shaped bent lower end 7 a fixed to the bottom wall 1 c of the rear side member 1.
The bulkheads 7, 7 ensure that the strength of the seat mounting bracket 6 is sufficiently high, so that the length and size of the seat mounting bracket 6 can be suppressed.

However, in such a conventional rear body structure, the bulkhead 7,
7, sufficient strength of the seat mounting bracket 6 is obtained, but at the same time, the strength near the bent portion 5 of the rear side member 1 is also increased more than necessary. For this reason,
When the following vehicle collides with the rear portion of the vehicle, the rear side member 1 does not bend downward at the vicinity of the bent portion 5 and transmits the collision energy to the vehicle body as it is.

As a result, there is a possibility that an occupant particularly sitting on the rear seat receives a large collision shock.

The present invention has been made in view of such a conventional problem, and it is an object of the present invention to secure a bending mode of a rear side member according to a collision energy at the time of a collision while securing the strength of a seat mounting bracket. It is an object of the present invention to provide a rear body structure of a vehicle capable of performing the following.

[0007]

According to a first aspect of the present invention, there is provided a rear support having a substantially U-shape extending in the front-rear direction of a vehicle body and having a cross-section opening upward. A seat mounting bracket disposed on the upper inside of both vertical walls of the rear support, and a connection suspended at least at a rear end of the seat mounting bracket and having a lower end fixed to a bottom wall of the rear support. A rear body structure of a vehicle having a wall and the two vertical walls of the rear support, the side walls being connected to the connecting wall.
Towards, to form a first notch formed by cutting a substantially U-shape from the upper edge downwardly, in a substantially central position on both sides of the vertical direction of the connecting wall opposite the first notch, the central portion from the side edge In the direction
It is characterized in that a second notch portion cut out in a substantially horizontal U-shape is formed.

According to the second aspect of the present invention, a substantially U-shaped rear side member extending in the front-rear direction of the vehicle body and having a cross-section opening upwardly, and the rear side member is overlapped and arranged inside the rear side member to rise up. A side member reinforce having a substantially U-shaped cross section having both side walls, a seat mounting bracket disposed on the upper inside of both side walls of the side member reinforce, and being vertically provided at least at a rear end of the seat mounting bracket, In a rear body structure of a vehicle having a lower end portion and a connecting wall fixed to a bottom wall of the side member reinforce, a side wall of the side member reinforce and a lateral side of the connecting wall, and a lower portion from an upper edge
A first notch formed in a substantially U-shape, and
Cut into a substantially horizontal U-shape from the side edge toward the center at both sides substantially at the center in the vertical direction of the connecting wall facing the first notch.
It is characterized in that a missing second notch is formed.

In the above construction, the seat mounting bracket is connected to the side member reinforce serving as the rear support via the connecting wall, so that the rigidity of the seat mounting bracket is improved.

In addition, when a following vehicle or the like collides with the rear portion of the vehicle, the side member and the side member are set with the first notch of the side member reinforcement and the second notch of the connecting wall as fulcrums according to the magnitude of the collision energy. Each rear of the member reinforce bends downward to absorb impact energy. That is, the first notch is provided on both sides of the rear support.
The vertical wall is cut out from the upper edge downward in a substantially U-shape.
Or the side walls of the side member reinforcement
Since it is cut out in a substantially U shape from the upper edge downward,
It is easy to bend downward at the first notch. Also,
2 The notch is cut out from the side edge in the direction of the center to a substantially horizontal U-shape.
Since the second notch was formed,
And the connecting wall is narrow. Moreover, the second notch is
Since the first notch is opposed to the first notch,
And the second notch of the connecting wall as a fulcrum,
And the rear of the side member reinforcements bend downward
To absorb the collision energy.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of a rear vehicle body structure according to the present invention, in which a rear side member 11 extending along the vehicle front-rear direction is fixed to a lower portion of a vehicle rear floor panel F. I have. This rear side member 11
Has a substantially U-shaped cross section opening upward as shown in FIG. 3 and has vertical walls 11b and 11c rising from both ends of a flat bottom wall 11a.
Flanges 11d and 11e fixed to the rear floor panel F are provided on the upper edge of 11c. The rear side member 11 has a bent portion 12 having a substantially central position rising along the front direction, and a side member reinforcement 13 is accommodated therein. 13 constitutes a rear support.

This side member reinforcement 13
Is a rear side member 1 as shown in FIGS.
1 has a U-shaped cross section with an upward opening substantially the same as that of FIG. 1, and the entire outer surfaces of the flat bottom wall 13 a and the side walls 13 b and 13 c are tightly fitted to the inner surface of the rear side member 11 and fixed by welding. The side walls 13b and 13c are formed so as to rise gently from the rear end side of the vehicle body in the forward direction, and the seat mounting bracket 14 to which the anchor portion of the rear seat S and the striker are fixed is disposed inside the side walls 13b and 13c. ing.

The seat mounting bracket 14 is disposed at a substantially central position of the side member reinforce 13 as shown in FIG. 1, that is, at a position corresponding to a rear portion of the rear seat, and has a structure having a substantially downward opening as shown in FIG. It has a U-shape and has bolt holes 15a through which bolts 16 for fixing to the floor panel F are inserted at predetermined positions in front and rear of the upper wall 15.
15a are formed, and connecting walls 17,
18 are integrally fixed.

As shown in FIGS. 1 and 5, the connecting walls 17 and 18 have lower ends 17a and 18a bent at substantially right angles to form a bottom wall 13a of the side member reinforcement 13.
Each is fixed by welding.

As shown in FIGS. 1 and 4, the side member reinforcement 13 is formed on the rear connecting wall 18.
On both side walls 13b and 13c, a substantially U-shaped downward from the upper edge
First cutout portions 19, 19 cut out in a shape are formed to face each other. On the other hand, as shown in FIG. 5, the first notch portions 19 , 1
A second notch 20, 20 having a substantially horizontal U shape and notched from the side edge toward the center is formed opposite to the side edge .

A fuel tank 21 mounted on the lower rear end of the vehicle body is mounted at a position rearward of the first and second notches 19 to 20 as shown in FIG.

Therefore, according to this embodiment, the strength of the seat mounting bracket 14 mounted on the upper portion of the side member reinforcement 13 is improved by the connecting walls 17 and 18, and the rigidity for supporting the anchor portion and the like is increased. . Therefore, reliable and strong support of the rear seat can be obtained. As a result, the seat mounting bracket 14 can be made sufficiently short, and the weight and cost can be reduced.

In addition, the side member reinforcement 1
The first cutouts 19, 19 formed in the upper part 3
Is cut out in a substantially U-shape, and
The second cutouts 20, 20 formed on both sides are arranged from the side edge to the middle.
Since it is cut out in a substantially U-shape in the center direction,
In the portion where the second notches 20 and 20 are formed, the rear side
The connecting wall 18 is narrow. Moreover, the second notches 20, 20
Is opposed to the first notches 19, 19,
The bending mode (buckling allowable portion) is set by the portions 19, 19 and the second notches 20, 20 , that is , the bending can be performed downward .

Therefore, for example, when a following vehicle collides (collides) with the rear portion of the vehicle and the collision energy acts in the axial direction from the rear end of the rear side member 11, the rear side member 11 according to the magnitude of the collision energy. The rear part of the side member reinforcement 13 is bent downward with the notches 19, 19, 20, 20 as fulcrums, as shown by the dashed line in FIG. For this reason, such collision energy is absorbed and buffered effectively, and transmission of an excessive collision shock to the occupant can be avoided. Furthermore, since the side member reinforcement 13 is provided to the rear end of the side member, the fuel tank 21 is protected.

In the above embodiment, the first notches 19, 19 are formed in the side member reinforcement 13, but when the side member reinforcement 13 is abolished, it is formed directly in the rear side member 11. Is also possible.

[0020]

As described above, in the present invention,
Since the connecting wall for connecting to the side member reinforce is provided on the rear support, that is, the seat mounting bracket fixed to the upper portion of the side member reinforce, the strength of the seat mounting bracket is improved. Therefore, the seat mounting bracket does not need to be formed large in the front-rear direction to secure the rigidity of the seat mounting bracket, and can be set as short as possible. As a result, the weight and cost can be reduced.

Further, since the first and second notches are formed, it is possible to set a bending mode of the rear side member, the connecting wall, and the like. Can be absorbed. That is, the first notch is formed in both vertical sides of the rear support.
The wall is cut out from the upper edge downward in a substantially U shape, or
Is on both sides of the side member reinforcement from the upper edge
Is cut out in a substantially U-shape,
It is easy to bend downward at. Also, the second notch
It is notched in a substantially horizontal U-shape from the side edge toward the center.
Therefore, at the portion where the second notch is formed,
The connecting wall is narrow. Moreover, the second notch is replaced with the first notch.
Because they face each other, the first cutout and the second cutout of the connecting wall
The bending mode (buckling allowance) is set by
Side member and side member rain at the bending allowance
Each rear of the force bends downward to absorb the collision energy
Can be collected. As a result, the collision shock of the occupant can be reduced, and the safety is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation at the time of a rear collision.

FIG. 3 is a partial perspective view of a rear side member provided in the present embodiment.

FIG. 4 is a partial perspective view showing a side member reinforcement provided in the present embodiment.

FIG. 5 is a perspective view of a seat mounting bracket and a connecting wall provided in the embodiment.

FIG. 6 is a sectional view taken along line AA of FIG. 1;

FIG. 7 is a partial perspective view showing a conventional rear link structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rear side member 11b, 11c Vertical wall 13 Side member reinforce 13a Bottom wall 14 Seat mounting bracket 17, 18 Connecting wall 19 First notch 20 Second notch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-262264 (JP, A) Japanese Utility Model Showa 63-89374 (JP, U) Japanese Utility Model Showa 58-112663 (JP, U) Japanese Utility Model Showa 63- 11281 (JP, U) Japanese Utility Model 63-53849 (JP, U) Japanese Utility Model 58-124358 (JP, U) Japanese Utility Model Utility Model 60-20443 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) B62D 25/20 B60R 22/22

Claims (2)

(57) [Claims] 1. A substantially U-shaped rear support extending in the front-rear direction of a vehicle body and having a cross-section opening upward, a seat mounting bracket disposed inside upper portions of both vertical walls of the rear support, and is vertically in at least the rear end of the seat mounting bracket, the rear vehicle body structure of a vehicle and a connecting wall having a lower end secured to the bottom wall of the rear support, a both vertical wall of the rear support On the side of the connecting wall,
A first U-shaped notch is formed below the upper edge, and a first notch is formed on both sides of the connecting wall facing the first notch at substantially the center in the vertical direction and substantially in the direction from the side edge toward the center. Horizontal U
A rear body structure of a vehicle, wherein a second cutout portion formed in a U -shape is formed. 2. A substantially U-shaped rear side member extending in the front-rear direction of the vehicle body and having an upwardly open cross section, and a substantially U-shaped cross-section having two side walls rising up and arranged inside the rear side member. A side member reinforce, a seat mounting bracket disposed inside the upper side of both side walls of the side member reinforce, and a bottom wall of the seat mounting bracket suspended downward at least at a rear end, and a lower end portion of the bottom wall of the side member reinforce. in the rear body structure of a vehicle equipped with a fixed connecting wall in front a side walls of the side members reinforce
Cut out in a substantially U-shape from the upper edge to the side of the connecting wall.
And thereby forming a first notch, at a substantially central position on both sides of the vertical <br/> Ru said connecting wall to face the first notch, cut into substantially lateral U-shape in the central portion direction from the side edge rear vehicle body structure of a vehicle, characterized in that the formation of the second cut portion lacking.