JPH061268A - Rear underbody structure - Google Patents

Abstract

PURPOSE:To enlarge the interior of a vehicle by moving a rear hip point to the rear part of a body without moving the front fitting part of a rear sub-frame downward the body. CONSTITUTION:A rear cross member 20 extended in the vehicle width direction is provided between the kick-up parts 14 of rear floor side members 12, and both vehicle width direction end parts 20A of the rear cross member 20 are welded to the vehicle width direction inner side face parts of the kick-up parts 14. The horizontal lower face parts 20D of both vehicle width direction end parts 20A of the rear cross member 20 are made into the connecting parts of the front fitting parts 26A of a rear sub-frame 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear underbody structure, and more particularly to a rear underbody structure having a rear subframe.

[0002]

2. Description of the Related Art One of the conventional examples of a rear underbody structure for an automobile having a rear subframe is an actual open flat plate, which is incorporated in Japanese Utility Model Laid-Open No. 32480.
No.

As shown in FIG. 3, in the rear underbody structure of this automobile, the connecting position of the front mounting portion 76A of the rear sub-frame 76 supporting the rear suspension to the rear floor side member 70 is the rear wheel center P.
And the kick-up portion 72 as the upper bent portion of the rear floor side member 70 is required because it is necessary to secure a sufficient ground height of the rear sub-frame 76.
Further, a support bracket 74 having a horizontal lower surface portion 74A as a connecting portion is provided, and the front mounting portion 76A of the rear sub-frame 76 is connected to the support bracket 74 via a mount 80.

[0004]

However, in this rear underbody structure, the rear sub frame 76 is used.
A support bracket 74 having a horizontal lower surface portion 74A serving as a connecting portion of the front attachment portion 76A is provided on the lower surface portion 72A of the kick-up portion 72 of the rear floor side member 70. Therefore, in order to secure a sufficient ground height of the rear sub-frame 76, it is necessary to provide the kick-up portion 72 at a position considerably forward of the rear floor side member 70, extend to a high position, and provide the support bracket 74 at the high position. There is.

A rear floor panel 84 is arranged along the rear floor side member 70, and a rear seat (not shown) is arranged at a position corresponding to the kick-up portion 72 on the upper surface of the rear floor panel 84, so that the rear seat is seated on the rear seat. The hip portion 82A of the occupant 82 is restricted in its vertical position by the kick-up portion 72 of the rear floor side member 70.

Therefore, in order to prevent the head of the passenger 82 sitting on the rear seat from colliding with the roof,
As shown in FIG. 4, it is necessary to set the position of the hip 82A of the occupant 82 seated on the rear seat at a position largely separated from the rear wheel center P toward the front of the vehicle body.

Therefore, the rear hip point (the hip joint point of the occupant when seated on the seat) HP is located far away from the rear wheel center P toward the front of the vehicle body, resulting in a problem that the passenger compartment is narrowed.

In consideration of the above facts, the present invention has a rear underbody structure in which the rear hip point can be moved to the rear of the vehicle body to widen the passenger compartment without moving the front mounting portion of the rear subframe to the lower side of the vehicle body. The purpose is to obtain.

[0009]

According to a first aspect of the present invention, there is provided a pair of rear floor side members extending in the vehicle front-rear direction and having a kick-up portion as an upward bending portion, and the pair of rear floor side members having a kick-up portion. And a rear sub-frame in which front end portions are connected to lower portions of both ends in the vehicle width direction of the rear floor cross member, respectively. It is characterized by that.

[0010]

According to the first aspect of the present invention, in the conventional structure, the front mounting portion of the rear sub-frame is connected to the horizontal lower surface of the support bracket connected to the lower surface of the kick-up portion of the rear floor side member. The position moves to the lower part of both ends in the vehicle width direction of the rear cross member located on the inner side in the vehicle width direction of the rear floor side member.

Therefore, since the support bracket is not present, if the inclination ratio of the kick-up portion of the rear floor side member is the same, the position of the front mounting portion of the rear sub-frame is the same as that of the conventional structure, that is, the rear mounting portion. The kick-up portion of the rear floor side member can be moved rearward of the vehicle body as compared with the conventional structure without moving the front mounting portion of the sub-frame downward of the vehicle body. Therefore, the rear seat can be installed in the rear of the vehicle body without changing the height. That is, the rear hip point can be set to the rear of the vehicle body, and the passenger compartment can be widened.

[0012]

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

In the figure, an arrow FR indicates a front direction of the vehicle body, an arrow UP indicates an upward direction of the vehicle body, and an arrow IN indicates an inward direction of the vehicle width.

As shown in FIG. 1, a pair of rear floor side members 12 extending in the vehicle front-rear direction are provided at both vehicle width direction ends of a rear underbody 10 of the vehicle body. The illustration of one rear floor side member 12 is omitted.

As shown in FIG. 2, the rear floor side member 12 is formed with a kick-up portion 14 as an upward bending portion. The kick-up portion 14 is gently curved toward the upper rear side of the vehicle body, and the rear end portion 14A reaches above the rear wheel center P of the rear wheel 16.

As shown in FIG. 1, the kick-up portion 14 of the rear floor side member 12 is curved inward in the vehicle width direction while avoiding the rear wheel 16. Further, a rear cross member 20 extending in the vehicle width direction is provided between the kick-up portions 14 of the rear floor side member 12, and both end portions 20A of the rear cross member 20 in the vehicle width direction are provided.
Is welded to the vehicle width direction inner side surface portion 14B of the kick-up portion 14.

As shown in FIG. 2, the rear cross member 2
The side view position of 0 is substantially the center of the kick-up portion 14 in the vehicle front-rear direction and the vehicle body up-down direction. In addition, the cross-sectional shape of the rear cross member 20 as viewed from the vehicle width direction is a substantially hat shape with the opening facing upward, and the front flange 20B and the rear flange 20C formed at the opening end are left and right. It is welded to the lower surface of a rear floor pan 28 arranged between the rear floor side members 12.

As shown in FIG. 1, the rear cross member 2
A nut 22 is provided inside both ends 20A of the vehicle width direction 0, and a front mounting portion 26A of the rear sub-frame 26 is supported by the nut 22 via a mount 24. Therefore, the horizontal lower surface portions 20D of both end portions 20A in the vehicle width direction of the rear cross member 20 are the connecting position of the front attachment portion 26A of the rear subframe 26.

As shown in FIG. 2, the rear floor pan 28
The front portion 28A constitutes a cabin floor portion, and a rear seat (not shown) is arranged therein. Further, the rear portion 28B of the rear floor pan 28 constitutes the trunk room bottom portion.

Next, the operation of this embodiment will be described.
In this embodiment having the above-described structure, the connecting position of the front mounting portion 26A of the rear sub-frame 26, which is the horizontal lower surface of the support bracket connected to the lower surface of the kick-up portion of the rear floor side member in the conventional structure, is changed to the rear floor. The rear cross member 20 located on the inner side in the vehicle width direction of the side member 12 moves to the horizontal lower surface portion 20D of both end portions 20A in the vehicle width direction.

Therefore, since the support bracket is not present, if the inclination ratio of the kick-up portion 14 of the rear floor side member 12 is the same, the height of the front mounting portion 26A of the rear sub-frame 26 is the same as that of the conventional structure. As
That is, the rear floor frame member 12 can be moved without moving the front mounting portion 26A of the rear sub-frame 26 downwardly of the vehicle body.
The kick-up portion 14 can be moved rearward of the vehicle body as compared with the conventional structure. Therefore, the rear seat can be installed in the rear of the vehicle body without changing the height. That is, the rear hip point HP can be set to the rear of the vehicle body, and the passenger compartment can be widened.

Further, in this embodiment, the rear sub-frame 26
Since the front mounting portion 26A can be arranged on the inner side in the vehicle width direction as compared with the conventional structure, the cross member 27 of the rear sub-frame 26 shown in FIG. 1 can be reduced in size and weight.

[0023]

According to the present invention, the front mounting portion of the rear sub-frame is mounted on the lower portions of both ends in the vehicle width direction of the rear cross member in which both ends are connected to the inner wall portions in the vehicle width direction of the kick-up portions of the pair of rear floor side members. Since the structure is combined, there is an excellent effect that the rear hip point can be moved to the rear of the vehicle body to widen the vehicle compartment without moving the front mounting portion of the rear sub-frame to the lower side of the vehicle body.

[Brief description of drawings]

FIG. 1 is a plan view showing a vehicle width direction half on one side of a rear underbody structure of an embodiment of the present invention.

FIG. 2 is a side view showing a rear underbody structure of one embodiment of the present invention.

FIG. 3 is a side view showing a rear underbody structure of a conventional example.

FIG. 4 is a plan view showing a half on one side in a vehicle width direction of a rear underbody structure of a conventional example.

[Explanation of symbols]

 10 Rear underbody 12 Rear floor side member 14 Kick-up part 14B Vehicle width direction inner side surface part 16 Rear wheel 20 Rear cross member 20A Vehicle width direction both ends 26 Rear subframe 26A Front mounting part P Rear wheel center HP Rear hip point

Claims (1)

[Claims] 1. A pair of rear floor side members extending in the front-rear direction of the vehicle body and having kick-up portions as upward bending portions, and vehicle-width-direction inner end portions of the kick-up portions of the pair of rear floor side members on both sides in the vehicle width direction. A rear underbody structure comprising: a rear cross member having parts connected to each other; and a rear subframe having front attachment parts connected to lower ends of both ends of the rear floor cross member in the vehicle width direction.