JPH076070Y2 - Rear structure of automobile body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rear structure of an automobile body.

(Prior Art) Conventionally, a rear structure of a vehicle body for an automobile is, for example, as shown in FIG. 3 and FIG. 4 which is a sectional view taken along the line BB, showing the rear floor 1 on the lower surface of the vehicle body side edge portion of the rear floor 1. The rear frame side 2 having a U-shaped cross section, which forms a box cross section along the front-rear direction of the vehicle body, is welded by spot welding. Further, a cross member 3 forming a box cross section is provided on the lower surface of the rear floor 1 in the vehicle width direction,
The end of the cross member 3 is welded to the rear frame side 2 to close the opening of the box cross section. On the other hand, a wheel apron 4 is provided upright on the side edge of the rear floor 1, and a rear bulk side 5 is fixed to the inner surface of the wheel apron 4 on the vehicle body.

The lower end portion of the rear bulk side 5 is fixed to the rear floor 1 via the bracket 6, and the upper end portion is fixed to the rear bulk 7 and the rear panel 8. The rear portion of the vehicle body is cross member 3, rear frame side 2, rear bulk side 5, and Stiffened by the rear bulk 7.

Further, as described in Japanese Utility Model Publication No. 55-47724, the rear floor and the rear frame are joined together along the wheel house, and the end portion of the cross member is fixed with a reinforcing material between the rear frame and the rear floor. This constitutes the rear body.

(Problems to be Solved by the Invention) According to the above conventional structure, the box cross section formed by the rear floor and the rear frame side and the box cross section formed by the rear floor and the cross member are combined,
The structure is to stiffen the vehicle body floor part, and further, the rear bulk side is fixed to the inside of the wheel apron, and the upper part is stiffened to the vehicle body side part and upper part by the rear bulk.

However, in this structure, both ends of the cross member are only joined to the rear frame side, and the strength of the joint portion with the rear bulk side is weak, and therefore, the strength of the joint portion between the floor and the wheel apron and the outer panel which is the vehicle body side wall is reduced. It is weak and insufficient to secure the torsional rigidity of the entire vehicle body.

The stress transmitted from the wheels due to traveling on a bad road and received by the cross member is absorbed by the large deformation of the entire vehicle body. If this is repeated, it will cause squeak and deformation of the entire vehicle body, and measures such as thickening the plate material of the component parts to compensate for the deformation must be taken, which goes against the general tendency toward weight reduction. .

The purpose of the present invention is to disperse the load stress received by the cross member etc. to the rear bulk through the rear bulk side by the components made of a relatively thin plate material, to secure the torsional rigidity of the entire vehicle body and to sufficiently absorb the load stress entering from the wheels and others. The object of the present invention is to provide a structure having a rigidity that can be received by the above.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cross member that forms a box cross section in the vehicle width direction in cooperation with the rear floor on the lower surface of the rear floor, and at the edge portion on the lower surface of the rear floor. The rear frame side that forms a box cross section that extends in the vehicle front-rear direction in cooperation with the rear floor is fixed, and the rear bulk side is provided on the inner side of the rear wheel apron that stands on the side edge of the rear floor. In a vehicle body rear portion structure in which a lower end is fixed to an upper surface of a rear floor, the rear floor is bent and formed in a step shape including at least an upper stage and a lower stage, and an end portion in a width direction of the body of the upper stage is inclined downward toward an outer side portion of the vehicle body. It is formed so as to be continuous to the lower tier via an inclined surface, and forms a box cross section in the vehicle width direction in cooperation with the upper rear floor. The end of the member is brought into contact with the inclined surface of the rear floor to close the box cross section, and a rear bulk side having a U-shaped cross section is fixed to the inner surface of the rear wheel apron to form the box cross section. A flat floor and an inclined portion are formed at the lower end of the bulk side, the flat portion is fixed to a lower rear frame having a rear frame side fixed to the lower surface, and the inclined portion contacts the end of the cross member. It is characterized in that the end portion of the cross member and the inclined portion of the rear bulk side are integrally connected via this inclined surface.

(Function) A box cross section is formed on the bottom surface of the rear floor by the rear floor and cross members, and a box cross section is formed by the inside of the rear wheel apron and the rear bulk side, and these box cross sections are continuous through the inclined surface formed on the rear floor. The cross-members and rear bulkside are strengthened by the positive coupling, and the inclined surface of the rear floor has a node effect in the box cross section. It is distributed on the side of the frame and the rear frame, and acts to improve the torsional rigidity of the vehicle body.

(Embodiment) An embodiment of the rear structure of a vehicle body of the present invention will be described below with reference to FIGS. 1 and 2. It should be noted that, in FIGS. 1 and 2, parts corresponding to those in FIGS. 3 and 4 are denoted by the same reference numerals for convenience of description.

FIG. 1 is a perspective view showing an essential part of a rear structure of an automobile body of the present invention, FIG. 2 is an exploded perspective view of the structure shown in FIG. 1, and reference numeral 1 is a rear floor. The rear floor 1 is located on the upper rear floor 1b through the elevation 1a toward the front of the vehicle body.
The rear seat support portion 1c and the rising portion 1d are formed stepwise, and the lower end of the rising portion 1d is joined to the front floor (not shown) by the spot welding by the flange 1e.

On the other hand, even toward the side of the car body, the upper floor via the inclined surface 1f
1b and a lower rear floor 1g that gently inclines toward the front of the vehicle body are formed in a stepped shape. A flange 1h is formed on the outer edge of the lower rear floor 1g on the outer side of the vehicle body. The flange 1h is connected to the rear wheel apron 4 and the outer panel (not shown).

A rear frame side 2 having a substantially U-shaped cross section is attached to the lower surface of the lower rear floor 1g formed on the rear floor 1 by flanges 2a and 2b to form a box cross section communicating with the front-rear direction of the vehicle body.

The front end of the rear frame side 2 is connected to the rising portion 1d of the rear floor 1 by spot welding by the flanges 2c, 2d and 2e provided at the front end of the rear frame side 2.

A cross member 3 having a substantially L-shaped cross section composed of a horizontal portion 3a and a vertical portion 3b is fixed by flanges 3d and 3e to the lower surface of the bent portion of the upper rear floor 1b of the rear floor 1 and the upright portion 1a, and is arranged in the vehicle width direction. It forms a cross-section of the box. A slanted portion 3c is formed at the vehicle body side end of the cross member 3, and
It is fixed to the lower surface of the lower rear floor 1g together with the flange 2a of the rear frame side 2 by 3f. On the other hand, the outer end of the vertical portion 3b is notched so as to match the inclined surface 1f of the floor 1, and is integrally spotted by the flange 3g so as to sandwich the inclined surface 1f with the flange portion 5m of the rear bulk side 5 described later. Joined by welding.

A concave portion that curves inward of the vehicle body is formed on the side edge of the rear floor 1 on the vehicle body side, and the rear wheel apron 4 is fitted to the rear floor 1 and the rear frame side 2 by the flange 1h and the rear frame side 2 flange 2b. Apron 4 is attached.

A rear bulk side 5 having a substantially U-shaped cross section is attached to the inner side surface of the rear wheel apron 4 by flanges 5a and 5b to form a communication box cross section in the vertical direction of the vehicle body. The lower end of the rear bulk side 5 is formed into flat portions 5c and 5d and inclined portions 5e and 5f, and the flat portions 5c and 5d have flanges 5g and 5h.
And the flanges 5g and 5h are welded and fixed to the upper surface of the lower rear floor 1g of the rear floor 1 by spot welding, and the inside end of the flange 5g is connected to the flange 3f of the cross member 3 via the lower floor 1g. Spot weld them together. The flange 5m formed on the slanted portion 5d and the flange 3g provided on the cross member 3 together with the slanted surface 1f
Is integrally welded and joined by spot welding.

An end portion 7a of a rear bulk 7, which has a U-shaped cross section, is connected to an upper end of the rear bulk side 5 so as to span the width direction of the vehicle body.

A rear panel 8 is attached to the upper surfaces of the rear bulk side 5 and the rear bulk 7 by flanges 5q, 5r, and 7b, and the rear bulk side 5, the rear bulk 7, and the rear panel 8 form a box cross section.

The rear structure of the vehicle body configured as described above includes a rear floor 1 and a cross member 3, and a box cross section communicating with the vehicle width direction, a box including a rear wheel apron 4 and a rear bulk side 5. The cross section and the rear floor 1 are continuously connected via the inclined surface 1f,
Further, at the upper end portion of the rear bulk side 5, the box section formed in the vehicle width direction by the rear bulk 7 and the rear panel 8 communicating with the vehicle width direction and the box section formed by the rear bulk side 5 and the rear wheel apron 4 are connected. Since the box cross section is formed in an annular shape at the rear part of the vehicle body, the rigidity of the entire vehicle body can be improved, and the stress input to the cross member can be sufficiently received. Since it is connected to the lower rear floor 1g, the stress is distributed to the rear frame side 2 and the torsional rigidity of the vehicle body can be improved.

In the above description, the vehicle body structure in which cross-members having an L-shaped cross section are joined has been described. However, a cross-member having a hat-shaped cross section is used, and a flange provided at the end of the cross member is provided on the bulk side through the inclined surface of the rear floor. May be integrally combined with.

(Effect) According to the present invention, the box cross section formed by the rear floor and the cross member and communicating with each other in the vehicle width direction and the box cross section formed by the rear wheel apron and the rear bulk side are joined via the inclined surface of the rear floor. Since the upper end of the rear bulk side is further connected to the rear bulk that is spanned in the width direction of the vehicle body, the box cross section is formed in an annular shape at the rear part of the vehicle body, and the box cross section is closed by the inclined surface of the rear floor. Since the inclined surface acts as a node, it is rigidly stiffened, and the load repeatedly input to the cross member is sufficiently received by the entire vehicle body, the torsional rigidity of the vehicle body is improved and the weight is reduced, and high strength is maintained. While reducing the cost of the car body.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of a rear structure of a vehicle body for explaining an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG.
FIG. 4 is a perspective view showing a rear structure of a conventional automobile body,
The figure is a cross-sectional view taken along the line BB. 1 …… Rear floor, 1b …… Upper rear floor, 1f …… Sloping surface, 1g …… Lower rear floor, 2 …… Rear frame side, 3 …… Cross member, 4 …… Rear wheel apron, 5 …… Rear bulk side, 7 ... rear bulk, 8 ...
... rear panel

Claims (2)

[Scope of utility model registration request] 1. A cross member is provided on the lower surface of the rear floor to cooperate with the rear floor to form a box cross section extending in the vehicle width direction, and a box cross section extending in the vehicle front-rear direction is formed at the side edge of the lower surface of the rear floor in cooperation with the rear floor. In addition to the fixed rear frame side, the rear wheel apron standing on the side edge of the rear floor is provided with a rear bulk side on the inner side surface of the vehicle body, and the lower end of this bulk side is fixed to the upper surface of the rear floor. At least an upper step and a lower step are formed in a stepped shape, and the vehicle body width direction end portion of the upper step is formed so as to be continuous with the lower step via an inclined surface that is inclined downward toward the vehicle body side outward,
The end of the cross member, which forms a box cross section in the vehicle width direction in cooperation with the upper rear floor, abuts the inclined surface of the rear floor to close the box cross section, and the rear wheel apron has a U-shaped cross section on the inner surface of the vehicle body. Of the rear bulk side is fixed to form a box cross section, and a flat portion and an inclined portion are formed at the lower end of the rear bulk side.The flat portion is fixed to the lower rear floor where the rear frame side is fixed to the lower surface. In addition, the inclined portion is brought into contact with the inclined surface of the rear floor with which the end portion of the cross member is brought into contact, and the end portion of the cross member and the inclined portion of the rear bulk side are integrally connected via this inclined surface. The rear structure of the car body. 2. A box cross section formed by an upper rear floor and a cross member and a box cross section formed by a rear wheel apron, a rear bulkside and a lower rear floor are continuous through an inclined surface formed on the rear floor. The structure according to claim 1.