JP2000142484A - Automobile rear body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hinder a spare tire from jumping up by providing a bottom wall of a luggage boot with a cross member crossing above a part positioned on the front side of the spare tire placed in a recess formed at the bottom wall of the luggage boot. SOLUTION: The rear edge of a rear floor panel front part 10 overhangs a part positioned on the front side of a recess 4 formed at a rear floor panel rear part 1, and the lower edge of a cross member 11 laterally extended along the opening face of the recess 4 and welded at its lateral side ends to the connection part of the inner surface of a rear wheel house to the rear floor panel front part 10 is welded to the rear end edge of the rear floor panel front part 10. The cross member 11 forms a closed cross section part crossing above the part positioned on the front side in a spare tire 12 placed in the recess 4. With this constitution, even when the spare tire 12 in the recess 4 is pushed out forward by impact load at the time of a rear end collision, the cross member 11 hinders the spare tire from jumping out into a luggage boot.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear body structure of an automobile constituting a trunk room.

[0002]

2. Description of the Related Art In the case of a small car whose body size is particularly restricted, the front and rear length of a trunk room must be reduced in order to secure a leg space for a rear seat. On the other hand, spare tires are generally housed in recesses provided in the bottom wall of the trunk room.

[0003]

However, if the length of the trunk is short, the spare tire in the recess is not necessarily pushed forward by the impact load at the time of a rear collision and jumps up into the trunk.

[0004] The present invention has been devised to solve such problems of the prior art, and its main objects are as follows.
It is an object of the present invention to provide an improved rear body structure of an automobile such that a spare tire does not jump into the trunk room in a rear collision even in a vehicle body in which the front and rear length of the trunk room cannot be made sufficiently large.

[0005]

In order to achieve such an object, according to the present invention, a spare tire 12 placed in a recess 4 formed in a bottom wall (rear portion 1 of a rear floor panel) of a trunk room T is provided. A cross member 11 crossing above a portion located on the front side in the trunk room is provided on the bottom wall of the trunk room. According to this, the jump of the spare tire is prevented by the cross member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to a specific embodiment shown in the accompanying drawings.

FIG. 1 shows an entire body frame having a space frame structure to which the present invention is applied. This vehicle body frame is assembled by welding together various frame members extruded from an aluminum alloy and various panel members pressed from an aluminum alloy plate. As shown in FIG. 2, a trunk room T which forms a part of the rear body structure includes a rear floor panel rear portion 1 forming a bottom wall, a rear panel 2 forming a rear wall, and a rear wheel house 3 forming a side wall thereof.
It consists of

The rear portion 1 of the rear floor panel and the rear panel 2 are formed by pressing a recessed portion 4 as a space for accommodating a spare tire and a bead 5 for securing rigidity with a single plate material, and then the boundary between the two. It is formed integrally by bending the wire 6 at a right angle by bend molding. Then, both side edges of the rear portion 1 of the rear floor panel are welded to the upper surfaces of a pair of left and right rear side frames 7 formed of an extruded material having a cross-sectional shape of a letter.

The rear end of the rear wheel house 3 which is formed by pressing into the trunk room T so as to form left and right side walls of the trunk room T and forms a space for accommodating the rear wheels, is provided at the rear end of the rear panel 2. A corner portion 8 joined to the edge is integrally formed. By welding the lower edge of the rear wheel house 3 to the upper surface of the rear side frame 7 and the edge of the corner portion 8 to the side edge of the rear panel 2, a trunk room T is formed.

At the front edge of the rear part 1 of the rear floor panel, FIG.
As shown in FIG. 1, a front portion 10 of a rear floor panel forming a base of the rear seat 9 is welded. The rear edge of the front part 10 of the rear floor panel overhangs above a portion located on the front side in the recess 4 formed in the rear part 1 of the rear floor panel, and the rear edge has an opening of the recess 4. The lower edge of the cross member 11 extending in the left-right direction along the surface and having its left and right ends welded to the connection between the inner surface of the rear wheel house 3 and the front portion 10 of the rear floor panel is welded. . The cross member 11 has a substantially trapezoidal cross-sectional shape, thereby forming a closed cross-section that crosses above a portion located on the front side of the spare tire 12 placed in the recess 4. When the spare tire 12 is stored lying down in the recess 4, the portion located on the front side of the spare tire 12 also extends under the cross member 11.

[0011]

As described above, according to the present invention, the cross member that crosses over the front part of the spare tire placed in the recess formed in the bottom wall of the trunk room is placed on the bottom wall of the trunk room. Since the cross member prevents the spare tire from jumping into the trunk room even if the spare tire in the recess is pushed forward by the impact load at the time of a rear collision, the front and rear length of the trunk room should be sufficient. Even in a small car that cannot be made large, a great effect can be achieved in reducing the influence of a rear collision on the occupant seated in the rear seat.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a vehicle body structure to which the present invention is applied.

FIG. 2 is a perspective view of a main part of a rear body structure according to the present invention.

FIG. 3 is a partial side sectional view of a rear body structure according to the present invention;

[Explanation of symbols]

 T Trunk room 1 Rear floor panel front 4 Recess 11 Cross member 12 Spare tire

Claims (1)

[Claims] 1. A cross member that crosses over a front portion of a spare tire placed in a recess formed in a bottom wall of a trunk room is provided on the bottom wall of the trunk room. Rear body structure of the car.