JP2000001185A - Rear body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify the rotation movement mode of the spare tire and to permit certain and stable energy absorption. SOLUTION: A deformation obstruction portion 33 with high rigidity is provided by a cross member 27 for installing side and rear side members and suspension, a cross member 29 for seat catcher, and a rear front panel 17. A deformation allowance portion 35 with lower rigidity than the deformation obstruction portion 353 is provided between the deformation obstruction portion 33 and a recess portion 25 for accommodating the spare tire. The collision load from the rear vehicle body deforms the deformation allowance portion 35 to rotatively move the recess portion 25 which accommodates a spare tire 7 to below the vehicle body.

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 on a lower side of a trunk room of an automobile.

[0002]

2. Description of the Related Art As a conventional rear body structure of this kind,
For example, FIG. 6 described in JP-A-6-199249
8 to FIG. That is, in this rear body structure, the spare tire 7 is horizontally accommodated in the trunk room 5 at the rear of the cabin 3 of the automobile 1, and is connected to the frame member 9 at the rear end of the cabin 3 to change to the rear of the automobile 1. A part 11 is formed, and a plurality of beads 15 are provided on the rear side member 13.
It is provided as shown in FIG. Therefore, when the vehicle 1 receives the collision energy from the rear, the rear side member 13 changes downward by the bead 15 and the spare tire 7
Can be rotated downward as shown in FIG. 9 to suppress the forward movement.

[0003]

However, since the bead 15 is merely provided on the rear side member 13 as described above, it is difficult to obtain stable rotation of the spare tire. There is also a problem that it is difficult to set a stable energy absorption amount.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rear body structure of an automobile in which a spare tire can be rotationally displaced more reliably, energy can be absorbed reliably and stably, and the amount of energy absorption can be easily set. And

[0005]

According to a first aspect of the present invention, a rear side member is disposed and fixed in the vehicle longitudinal direction along both sides in the vehicle width direction of a rear floor panel at a rear portion of the vehicle body, and a spare tire is substantially horizontally mounted on the rear floor panel. A suspension mounting cross member disposed in the vehicle width direction on the front side of the concave portion in the vehicle front-rear direction and coupled to the rear floor panel and the left and right rear side members,
A seat catcher cross member disposed in the vehicle width direction and coupled to the rear floor panel and the left and right rear side members is provided at a front side of the suspension mounting cross member. The left and right rear side members, the suspension mounting cross member, and the seat catcher A rigid deformation preventing portion is provided between the cross member and the rear floor panel, and a rigidity lower than the deformation preventing portion is lower between the deformation preventing portion and the concave portion for storing the spare tire. A feature is provided in which a deformation permitting portion capable of rotating the concave portion storing the spare tire downwardly of the vehicle body is provided.

According to a second aspect of the present invention, there is provided the rear body structure of the automobile according to the first aspect, wherein the suspension mounting cross member has a height that is at least half the height of the recess. .

According to a third aspect of the present invention, there is provided the rear body structure of an automobile according to the first or second aspect, wherein the suspension mounting cross member is a base having a hat cross-sectional shape fixed to a lower surface of the rear floor panel. And an extension portion fixed to the base portion and extending downward.

According to a fourth aspect of the present invention, there is provided the rear body structure of an automobile according to any one of the first to third aspects, wherein the suspension mounting cross member has a structure in which the left and right rear side members correspond to a wheel house. It is characterized in that it is connected to the rear side member at a portion where the width is narrower in the width direction.

According to a fifth aspect of the present invention, there is provided the rear body structure of an automobile according to any one of the first to fourth aspects, wherein a reinforcing core is provided on the seat catcher cross member. .

According to a sixth aspect of the present invention, there is provided the rear body structure of an automobile according to any one of the first to fifth aspects, wherein the deformation permitting portion has an embossed portion provided on the rear side member. I do.

According to a seventh aspect of the present invention, there is provided the rear body structure of the automobile according to the sixth aspect, wherein the width of the embossed portion becomes narrower in the vehicle width direction at a portion where the rear side member corresponds to a wheel house. It is also provided at a boundary where it gradually begins to spread behind the vehicle.

[0012]

According to the present invention, when a collision load is applied to the spare tire storage recess at the time of a rear collision of the vehicle, the load is transmitted to the deformation preventing portion via the deformation allowing portion. Then, the deformation is prevented by the deformation preventing portion, so that the deformation allowing portion starts to be deformed, and the concave portion for storing the spare tire can be surely rotated to the lower side of the vehicle body. Further, by setting the deformation preventing portion and the deformation allowing portion, the energy absorption thereof is ensured and stabilized, and the setting of the energy absorption amount becomes easy.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the invention, in the event of a rear collision, the concave portion for storing the spare tire is restricted by the suspension mounting cross member, so that the rotational movement of the vehicle body downward can be prevented. It can be performed more reliably.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, the rigidity of the suspension mounting cross member is ensured by the base portion having the hat cross-sectional shape, and the extended portion is used to store the spare tire. However, the height can be easily secured.

According to the fourth aspect of the invention, in addition to the effects of any one of the first to third aspects, the width of the left and right rear side members is made mutually corresponding to the wheel house in the vehicle width direction by the suspension mounting cross member. By reinforcing the narrowed part, it is easy for the rear side member to deform before the suspension mounting cross member at the time of a rear collision, and the rotational movement downward and the energy absorption of the recess for storing the spare tire are more reliably performed. And it can be easily performed.

According to the fifth aspect of the present invention, in addition to the effect of any one of the first to fourth aspects, the rigidity of the seat catcher cross member can be further increased by the reinforcing core material, and the concave portion for storing the spare tire is provided. More reliably regulates
The rotational movement can be performed more reliably downward of the vehicle body.

According to the sixth aspect of the present invention, in addition to the effect of any one of the first to fifth aspects, the bending mode of the rear side member can be more reliably specified at the time of a rear collision by the embossed portion of the rear side member. More reliable rotational movement of the recess for storing the tire and more reliable and stable energy absorption can be performed.

According to the seventh aspect of the invention, in addition to the effect of the sixth aspect, the width of the embossed portion is narrowed in the vehicle width direction with the rear side member corresponding to the wheel house.
By providing a boundary at which the rear side member gradually begins to spread, the folding mode of the rear side member can be made more reliable, the rotation of the concave portion for storing the spare tire can be accurately performed, and the energy can be reliably and stably absorbed. it can.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a partially omitted sectional view of a rear body structure of an automobile according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a perspective view of a rear floor panel 17, and FIG. (B) shows the state after the collision. These FIGS. 1, 2
As shown in FIG. 3, a rear side member 13 is provided in the vehicle front-rear direction along both sides in the vehicle width direction of a rear floor panel 17 at the rear of the vehicle body of the vehicle 1. Left and right rear side members 1
3 has a shape in which the width is narrower in the vehicle width direction at the portion 13a corresponding to the wheel house as shown in FIG.

The rear ends of the left and right rear side members 13
They are mutually connected by a rear end cross member 19 having a closed sectional structure. Although not shown, a rear bumper is arranged behind the rear end cross member 19. The rear of the trunk room 21 can be opened and closed by a back door 23.

The rear floor panel 17 has a recess 25 in the lower part of the trunk room 21 for storing the spare tire 7 substantially horizontally. On the front side of the recess 25 in the vehicle longitudinal direction, a suspension mounting cross member 27 is provided which is disposed in the vehicle width direction and is connected to the lower surface of the rear floor panel 17 and the left and right rear side members 13 by spot welding or the like. I have. A suspension device (not shown) is supported by the suspension mounting cross member 27.

The suspension mounting cross member 27
Are a hat portion-shaped base portion 27a and a base portion 27
a, which extends downwardly and is fixed to half of the height of the recess 25, that is, the height of the recess 27 in this embodiment. Have been. In the cross section of FIG. 1, the extension 27b is set so that the distance between the extensions 27b is narrowed downward. The suspension mounting cross member 27 is joined to the left and right rear side members 13 at a portion 13a where the width is narrowed in the vehicle width direction.

The suspension mounting cross member 2
A cross member 29 for a seat catcher, which is arranged in the vehicle width direction on the front side of the vehicle 7 and is connected to the upper surface of the rear floor panel 17 and the left and right rear side members 13 by spot welding or the like. The seat catcher cross member 29 functions to mount the rear seat 31.

The cross member 29 for the seat catcher
Inside, a reinforcing core material 29a (iron core) is fixed as shown in FIGS. The reinforcing core member 29a is fixed to the inner surface of the seat catcher cross member 29 by welding or the like, and both left and right ends thereof are joined to the left and right rear side members 13. However, the core material 29a may be structured so that the left and right ends are not joined to the left and right rear side members 13.

The suspension mounting cross member 27, the seat catcher cross member 29, and the left and right rear side members 13 form a trapezoidal reinforcement that tapers toward the rear of the vehicle body as is apparent from the plane of FIG. The reinforcing frame structure and the rear floor panel 17 constitute a frame structure, and a highly rigid deformation preventing portion 33 is formed.

Further, the rear side of the deformation preventing portion 33 is not particularly reinforced between the deformation preventing portion 33 and the concave portion 25 for storing the spare tire.
In addition, it constitutes a deformation allowing portion 35 that is curved downward.

In the trunk room 21, a luggage fixed to the rear floor panel 17, that is, a trunk floor, for example, a detached seat 37 is fixed.

In such a rear body structure, when a rear collision occurs, in a light collision, the rear end cross member 19 and the rear side member 13 receive a collision load, and energy is absorbed by collapsing the rear end cross member 19 and the like.

When the collision load further increases, the collision load is transmitted to the spare tire 7, and the spare tire 7
5, and the load is transmitted further forward.

Since the deformation permitting portion 35 is formed at the front end of the concave portion 25 and the deformation preventing portion 33 is formed at the front side, the deformation transmitting portion 35 is formed as shown in FIG. Starts to deform and the rear side member 13
Also, bending deformation starts on both sides of the deformation allowing portion 35.

In particular, in the embodiment, the deformation permitting portion 35 is connected to the suspension mounting cross member 2 joined at the narrowest portion 13a of the left and right rear side members 13.
7, the right and left side members 13
Is also surely performed at the corresponding portion.

Due to the deformation of the deformation allowing portion 35, the front end of the concave portion 25 abuts against the rear surface of the suspension mounting cross member 27, and the load is transmitted from the suspension mounting cross member 27 to the rear floor panel 17 side. become. The height of the suspension mounting cross member 27 is at least half the height of the recess 25, and FIG.
Has a height higher than that of the recess 25, and when the front end of the recess 25 abuts against the suspension mounting cross member 27, the load from the spare tire 7 causes the spare tire 7 and the recess 25 to move toward the deformation permitting portion 35 side. As a fulcrum, it is further rotated downward.

Particularly in the embodiment, the rear surface of the suspension mounting cross member 27 is inclined forward and downward, so that the rotation of the spare tire 7 downward is further promoted. Further, at this time, the load transmitted from the suspension mounting cross member 27 to the rear floor panel 17 is received by the highly rigid deformation preventing portion 33, so that the suspension mounting cross member 27 restricts the recess 25 more reliably. Can be made.

In this manner, the spare tire 7 can be rotationally moved downward around the deformation permitting portion 35, which is the location where the spare tire 7 was specified at the time of the rear collision, and the mode of rotational movement can be reliably specified.

By the rotational movement of the spare tire 7, the seat 37, which is the luggage in the trunk room 21, can surely be rotationally moved in the same direction, and the safety can be greatly improved. Further, by setting the deformation permitting portion 35 immediately after the deformation preventing portion 33, the deformation portion of the rear floor panel 17 and the rear side member 13 can be specified, and energy absorption can be performed reliably and stably by the specified deformation. And the energy absorption amount can be easily set.

In the above embodiment, the reinforcing core member 29a is provided in the seat catcher cross member 29.
This can be omitted from the core material 29a. However, when the core member 29a is provided, the sheet catcher cross member 29 can be made thinner.

FIG. 5 shows another embodiment. In this embodiment, an embossed portion 39 is provided on the rear side member 13. The embossed portion 39 forms a boundary 13 where the width of the rear side member 13 becomes narrower in the vehicle width direction corresponding to the wheel house, and the rear side member 13 starts to gradually spread to the rear of the vehicle.
b, for example, a pair provided in front and back. The depth of the embossed portion 39 is set, for example, from 5 mm to 10 mm. The embossed portion 39 is provided with the deformation permitting portion 35.
Is part of.

When the rear side member 13 is deformed as shown in FIG.
When bending deformation occurs in 3b, the mode can be specified more reliably. Therefore, the spare tire 7 and the recess 2
5 can be more reliably rotated downward, and the collision energy can be reliably and stably absorbed.
In addition, the setting of the energy absorption amount becomes easier.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view according to an example of an embodiment of the present invention.

FIG. 2 is a partially omitted plan view according to one embodiment.

FIGS. 3A and 3B are perspective views partially omitted before collision and FIG. 3B is a partially omitted perspective view after collision according to an embodiment.

FIG. 4 is a perspective view showing a core according to one embodiment.

FIG. 5 is a partially omitted plan view according to another embodiment.

FIG. 6 is a schematic perspective view showing a rear body structure according to a conventional example.

FIG. 7 is a schematic sectional view of a conventional rear body structure.

FIG. 8 is a perspective view of a rear side member according to a conventional example.

FIG. 9 is an operation explanatory view according to the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 7 Spare tire 13 Rear side member 13a Part corresponding to wheel house 13b Boundary 17 Rear floor panel 25 Depression for storing spare tire 27 Cross member for suspension attachment 27a Base 27b Extension 29 Cross member for seat catcher 29a Core material 33 Deformation prevention Part 35 Deformation allowable part

Claims (7)

[Claims] 1. A rear side member is disposed and fixed in the vehicle front-rear direction along both sides in the vehicle width direction of a rear floor panel at a rear portion of a vehicle body, and a concave portion for storing a spare tire substantially horizontally is provided in the rear floor panel. A suspension mounting cross member arranged in the vehicle width direction on the front side in the front-rear direction and coupled to the rear floor panel and the left and right rear side members; and the rear floor disposed in the vehicle width direction on the front side of the suspension mounting cross member. A cross-member for a seat catcher coupled to the panel and the left and right rear side members is provided; Deformation prevention part and recess for storing the spare tire And a deformation permitting portion having a rigidity lower than that of the deformation preventing portion and capable of rotating a concave portion storing the spare tire downwardly of the vehicle body by a collision load from the rear of the vehicle body. Construction. 2. The rear vehicle body structure according to claim 1, wherein the suspension mounting cross member has a height that is at least half the height of the recess. . 3. The rear body structure of an automobile according to claim 1, wherein the suspension mounting cross member is a base portion having a hat cross-sectional shape fixed to a lower surface of the rear floor panel, and the base portion. A rear body structure of an automobile, comprising: an extension portion fixed to the vehicle and extending downward. 4. The rear body structure of an automobile according to claim 1, wherein the left and right rear side members of the suspension mounting cross member mutually correspond to a wheel house in a vehicle width direction. A rear body structure of an automobile, wherein the rear body member is connected to the rear side member at a portion having a reduced width. 5. The rear body structure of an automobile according to claim 1, wherein a reinforcing core is provided on the seat catcher cross member. . 6. The rear body of a vehicle according to claim 1, wherein the deformation permitting portion has an embossed portion provided on the rear side member. Construction. 7. The rear body structure of an automobile according to claim 6, wherein the embossed portion has a width that is narrower in a width direction of the vehicle corresponding to a wheel house, and that the rear side member gradually expands toward the rear of the vehicle. A rear body structure of a car, which is provided at a starting point.