JP2004001634A - Rear body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a shock absorbing effect at the time of a rear face collision of an automobile while minimizing a body weight increase and effects on the design of the body. <P>SOLUTION: A side pocket 11b for which both of the right and left ends of a rear floor 11 are bent into a U-shaped cross section is arranged between both of the right and left ends of a bumper beam 14 of a rear bumper and the rear surfaces of right and left rear wheels. A wear plate 16 which is provided on the front end of the side pocket 11b is made to face to the rear surfaces of the rear wheels. The side pocket 11b which moves forward by a load applied to the bumper beam 14 by a rear surface collision of the automobile comes into contact with the rear wheels and collapses, and thus, the collision energy can be absorbed. Since the collision energy is absorbed by the side pocket 11b, the increasing of the board thickness for other members or the increasing of a crush allowance for the body rear section are not required. Therefore, the increase of the body weight or effects to the design of the body can be suppressed to a minimum. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rear body structure of a vehicle for effectively absorbing the impact of a rear collision of the vehicle.
[0002]
[Prior art]
The impact of the rear collision of the automobile is transmitted from a rear bumper including a bumper face, a bumper absorber, a bumper beam, and the like to a rear panel, a floor panel, a rear fender, a rear frame, and the like. Of the above members, a relatively large shock absorbing effect is exhibited when the rear frame having a closed cross section and extending in the vehicle longitudinal direction and the bumper beam having a closed cross section extending in the vehicle left and right direction are crushed. However, the impact absorbing effect of other panel-like members cannot be expected so much.
[0003]
Therefore, conventionally, the overhang of the vehicle body from the fuel tank or the cabin to the rear has been increased to secure the crushing allowance at the time of collision, and the cross-sectional area, plate thickness, and material strength of the rear frame and bumper beam have been increased. To improve the shock absorbing effect.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional method, there is a problem that the weight of the vehicle body increases or restrictions on the design of the vehicle body occur, and it is desired to enhance the shock absorbing effect at the time of a rear collision while avoiding those problems. Was.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to enhance the impact absorbing effect at the time of a rear collision of an automobile while minimizing the increase in the weight of the vehicle and the influence on the design of the vehicle.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a shock absorbing member is provided between the left and right ends of the bumper beam and the rear surfaces of the left and right rear wheels, respectively. A rear body structure of an automobile is proposed in which a shock absorbing member moving to abut on a rear wheel to be crushed to absorb a collision shock.
[0007]
According to the above configuration, since the shock absorbing members are provided between the left and right ends of the bumper beam and the rear surfaces of the left and right rear wheels, the shock absorbing member that moves forward by the load applied to the bumper beam due to the rear collision of the vehicle. When the member comes into contact with the rear wheel and is crushed, the collision energy can be absorbed. Since the impact energy is absorbed by the shock absorbing member, there is no need to increase the thickness of other members or increase the amount of crushing at the rear of the vehicle, minimizing the increase in vehicle weight and the effect on vehicle design. Can be suppressed.
[0008]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the rear body structure of the automobile is characterized in that the shock absorbing members constitute bins provided on both right and left sides of a rear floor. Suggested.
[0009]
According to the above configuration, the containers provided on the left and right sides of the rear floor are used as shock absorbing members, so that the collision energy absorbing effect can be reduced while suppressing an increase in the number of parts and an increase in weight as compared with the conventional collision response structure. Can be demonstrated.
[0010]
According to the third aspect of the present invention, there is provided an extension extending from both left and right ends of the bumper beam toward the left and right rear wheels, and the extension moves forward at the time of a rear collision of the vehicle, and 2. Description of the Related Art A rear body structure of an automobile has been proposed, which absorbs the impact of a collision by abutting against a wheel and crushing the wheel.
[0011]
According to the above configuration, since the extension portions extending from the left and right ends of the bumper beam toward the left and right rear wheels are provided, the extension portions that move forward due to the load applied to the bumper beam due to the rear collision of the vehicle are rearward. The collision energy can be absorbed by abutting the wheel and crushing it. Since the collision energy is absorbed by the extension of the bumper beam, there is no need to increase the thickness of other members or increase the amount of crushing at the rear of the vehicle, minimizing the effect of increasing the vehicle weight and the vehicle design. In addition, the load applied to the bumper beam can be transmitted to the extended portion early and directly, and the effect of absorbing the collision energy can be further enhanced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0013]
FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is an overall side view of an automobile, FIG. 2 is a perspective view of a rear part of an automobile viewed from obliquely rearward, and FIG. 4 is a view in the direction of arrow 4 in FIG. 2, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, and FIG. 6 is a graph showing the effect of the present invention.
[0014]
As shown in FIGS. 1 to 5, a rear floor 11 constituting a floor of a trunk room is provided on a rear body of the automobile V, and a pair of left and right rear frames 12 extending in the vehicle front-rear direction on left and right sides of a lower surface thereof. 12 are combined. The left and right rear frames 12, 12 are connected by a cross member 19 extending in the left-right direction of the vehicle body. Each rear frame 12 is a channel-shaped member having an open upper surface, and a flange at an upper end thereof is welded to a lower surface of the rear floor 11. A rear panel 13 constituting a rear wall of a trunk room is welded to the rear end of the rear floor 11 and the rear ends of the left and right rear frames 12 and 12, and a bumper beam 14 extending in the left-right direction of the vehicle along the rear panel 13 is welded. Is done. Left and right rear side panels 15, 15 are welded to left and right side edges of the rear floor 11 and the rear panel 13, respectively.
[0015]
Spare tire storage recesses 11a for storing spare tires are formed in the center of the rear floor 11, which constitutes the floor of the trunk room, and left and right ends of the rear floor 11, which correspond to the left and right sides of the trunk room, Side pockets 11b, 11b having a U-shaped cross section with an open upper surface are formed. The side pockets 11b, 11b are used as spaces for storing small items in the trunk room.
[0016]
The height of the side pockets 11b, 11b in the vertical direction increases on the front side of the vehicle body. The front surface of the rear panel 13 is welded to the rear end openings of the low side pockets 11b, 11b, and the height of the side pockets is high. Backing plates 16, 16 are welded to the front end openings of 11b, 11b. The backing plates 16, 16 are welded to the rear surfaces of the wheel houses 17, 17 welded to the left and right sides of the rear floor 11. In this state, the backing plates 16, 16 at the front ends of the side pockets 11b, 11b face the upper portion of the rear surface of the rear wheels Wr, Wr housed in the wheel houses 17, 17 from the center.
[0017]
The left and right sides of the rear bumper face 18 attached to the rear surface of the rear panel 13 so as to cover the bumper beam 14 wrap around the vehicle body and cover the outside of the left and right side pockets 11b, 11b invisibly. I have.
[0018]
When the vehicle V is hit by the rear bumper face 18 from behind, a part of the load is transferred from the bumper beam 14 via the rear panel 13 to the left and right rear frames 12, 12, the rear floor 11, and the left and right rear side panels. The impact energy is absorbed by being transmitted to 15, 15 and crushing them. At this time, the left and right rear frames 12, 12 having a closed cross section and arranged in the front-rear direction of the vehicle body buckle, and a large energy is absorbed.
[0019]
Another part of the load of the collision is transmitted from both ends of the bumper beam 14 to the left and right side pockets 11b, 11b, and the abutment plates 16, 16 provided at the front ends thereof contact the rear surfaces of the left and right rear wheels Wr, Wr. . Since the rear wheels Wr, Wr supported by the axle have high rigidity in the front-rear direction, the contact plates 16, 16 of the side pockets 11b, 11b abutting on the rear surfaces of the rear wheels Wr, Wr are prevented from moving forward. Therefore, it is effectively crushed by a load from behind and absorbs collision energy. At this time, since the side pockets 11b have a U-shaped cross section and extend in the front-rear direction of the vehicle body, they buckle due to a load from the rear, thereby exhibiting a large energy absorbing effect.
[0020]
As described above, in addition to the left and right rear frames 12, 12, the left and right side pockets 11b, 11b contribute to the absorption of the collision energy. , 12 and the bumper beam 14 without increasing the strength, that is, while minimizing the increase in the weight of the vehicle body and the influence on the design of the vehicle body, it is possible to enhance the shock absorbing effect at the time of a rear collision of the vehicle. In particular, the use of the existing side pockets 11b, 11b as a shock absorbing member can contribute to a reduction in the number of parts and weight.
[0021]
As shown in FIG. 6, according to the present embodiment, the collision energy absorption effect of the side pockets 11b, 11b reduces the amount of deformation of the vehicle body as compared with the conventional example and secures the shape of the passenger compartment, while maintaining the same shape as the conventional example. The shock absorbing effect can be obtained.
[0022]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0023]
The second embodiment is provided with extensions 14a, 14a extending from both left and right ends of the bumper beam 14 toward the left and right rear wheels Wr, Wr. The extension portions 14a, 14a of the embodiment are configured by bending the left and right end portions of the bumper beam 14. However, the extension portions 14a, 14a are formed of separate members and are connected to the left and right end portions of the bumper beam 14. You can also. Like the side pockets 11b, 11b of the first embodiment, the extension portions 14a, 14a may increase the height in the vertical direction toward the rear surface of the rear wheels Wr, Wr. May be constant.
[0024]
According to the second embodiment, in addition to the functions and effects of the first embodiment, since the bumper beam 14 and the extension portions 14a, 14a are integrated, the load applied to the bumper beam 14 is directly reduced by the extension portions 14a, 14a. To abut on the rear wheels Wr, Wr at an early stage to further enhance the effect of absorbing the impact of a rear collision.
[0025]
Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.
[0026]
For example, in the first embodiment, the side pockets 11b, 11b are used as shock absorbing members, but a shock absorbing member having a closed cross section dedicated to shock absorption can be provided.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, the shock absorbing members are provided between the left and right ends of the bumper beam and the rear surfaces of the left and right rear wheels, respectively. The impact absorbing member that moves forward by the applied load abuts on the rear wheel and crushes, thereby absorbing the collision energy. Since the impact energy is absorbed by the shock absorbing member, there is no need to increase the thickness of other members or increase the amount of crushing at the rear of the vehicle, minimizing the increase in vehicle weight and the effect on vehicle design. Can be suppressed.
[0028]
According to the second aspect of the present invention, since the bins provided on the left and right sides of the rear floor are used as the shock absorbing members, an increase in the number of parts and an increase in weight are suppressed as compared with the conventional collision handling structure. The effect of absorbing the collision energy can be exhibited.
[0029]
According to the third aspect of the present invention, since the extended portions extending from the left and right end portions of the bumper beam toward the left and right rear wheels are provided, the load applied to the bumper beam due to the rear collision of the vehicle causes the vehicle to move forward. When the extended portion moves toward the rear wheel and crushes, the collision energy can be absorbed. Since the collision energy is absorbed by the extension of the bumper beam, there is no need to increase the thickness of other members or increase the amount of crushing at the rear of the vehicle, minimizing the effect of increasing the vehicle weight and the vehicle design. In addition, the load applied to the bumper beam can be transmitted to the extended portion early and directly, and the effect of absorbing the collision energy can be further enhanced.
[Brief description of the drawings]
FIG. 1 is an overall side view of an automobile. FIG. 2 is a perspective view of a rear portion of an automobile body viewed obliquely from behind. FIG. 3 is a view in an arrow direction of FIG. 2 in FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. 3 FIG. 6 is a graph showing the effect of the present invention FIG. 7 is a view corresponding to FIG. 3 according to a second embodiment of the present invention
11 Rear floor 11b Side pocket (shock absorbing member)
14 Bumper beam 14a Extension Wr Rear wheel

Claims (3)

A shock absorbing member (11b) is provided between the left and right ends of the bumper beam (14) and the rear surfaces of the left and right rear wheels (Wr), respectively. A rear body structure of an automobile, wherein a collision impact is absorbed by abutting a wheel (Wr) and crushing the wheel. The rear body structure of an automobile according to claim 1, wherein the shock absorbing member (11b) forms a case provided on both left and right sides of a rear floor (11). An extension (14a) is provided extending from both left and right ends of the bumper beam (14) toward left and right rear wheels (Wr). The extension (14a) moves forward at the time of a rear collision of the vehicle, and (Wr) The rear body structure of an automobile, wherein the rear body structure absorbs the impact of a collision by being crushed by contact.

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