JPH10244963A - Rear body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rear body structure of an automobile which can increase the strength and rigidity around the rear opening part of a car body. SOLUTION: By joining an extension part 15 bend and extended toward the car width direction center side to the lower end of the back pillar reinforce 11 of a back pillar 9 with the outside surface of a rear end cross member 6 and forming a second car width direction closed section part 16 continued to the vertical direction closed section part 12 of the back pillar 9 in the car width direction closed section part 8 consisting of the rear end cross member 6 and a rear end panel 7, these vertical direction closed section part 12 can be continued to the car width direction closed section part 8 and the strength and rigidity around the rear opening part of the car body can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobiles,
The present invention relates to a rear body structure of an automobile having a back door.

[0002]

A rear opening of a back door type automobile has a back pillar formed in a closed cross section with a back pillar inner and a back pillar reinforce on both sides thereof and extending vertically, and a rear floor. Although a main skeleton is formed by a closed cross-section in the vehicle width direction formed by a rear end cross member joined to a panel floor end and a rear end panel, strength and rigidity around the rear opening are secured. Since the closed cross section of the back pillar and the closed cross section in the vehicle width direction formed by the rear end cross member and the rear end panel become discontinuous, it is necessary to take additional reinforcing means to increase the strength and rigidity.
It is unavoidable that not only the structure becomes complicated but also disadvantageous in weight and cost (see Japanese Patent Application Laid-Open No. 6-144289).

Accordingly, the present invention is to provide a rear body structure of an automobile that can further increase the strength and rigidity around the rear opening of the vehicle body with a simple structure.

[0004]

According to the present invention, the rear end cross member joined to the floor end of the rear floor panel and the rear end panel joined to the outside of the rear end cross member extend in the vehicle width direction. While forming a closed cross section, a back pillar inner having a lower end joined to a rear side inner panel and a rear end panel joined to the floor side of the rear floor panel, and a back pillar reinforce joined to the outside of the back pillar inner, In a structure in which a back pillar having a closed cross section extending in the vertical direction is formed, an extension portion bent toward the center in the vehicle width direction is extended at a lower end portion of the back pillar reinforcement, and the extension portion is a rear end cross member. The rear end cross member and the rear end A second vehicle width direction closed cross-section that is continuous with the back pillar closed cross-section is formed by the extension portion and the rear end cross member in the vehicle width direction closed cross-section formed by the panel. .

According to a second aspect of the present invention, the second vehicle width direction closed cross-section is formed to a position crossing a rear end of a rear side member joined to a lower surface of a rear floor panel in a front-rear direction. The closed cross-section in the front-rear direction formed by the rear side member and the rear floor panel is orthogonal to the closed cross-section in the second vehicle width direction.

According to a third aspect of the present invention, a sheet portion is bulged and formed on the rear wall of the end portion of the extension portion according to the first and second aspects, and the extension portion is formed on the rear end panel via the sheet portion. It is characterized by being combined.

According to a fourth aspect of the present invention, the seat portion according to the third aspect is formed on an extension of the rear end portion of the rear side member, and the end portion of the extension portion on which the seat portion is formed is provided with the seat portion. A box-shaped seat block member formed in accordance with the inner cross-sectional shape is fitted and fixed, and the seat block member is joined to the outer surface of the rear end cross member to close the end of the second closed cross-section in the vehicle width direction. In addition, a rear bumper stay is connected and fixed to the seat block member with the rear end panel and the seat portion interposed therebetween.

[0008]

According to the first aspect, the extension portion at the lower end of the back pillar reinforcement is bent and extended toward the center in the vehicle width direction and is joined to the outer surface of the rear end cross member. A closed cross section in the vehicle width direction including the extension portion and the rear end cross member is formed in a closed cross section in the vehicle width direction including the cross member and the rear end panel, and a vertical closed cross section of the back pillar is formed. Is continuously connected to the closed cross-section in the vehicle width direction, and in addition to the connection of the vertical frame member and the vehicle width direction frame member, the lower end of the back pillar is connected in the vehicle width direction. Has a multiple closed cross-sectional structure due to the formation of the closed cross-section in the second vehicle width direction, so that the strength and rigidity around the rear opening of the vehicle body can be further increased.

Further, as described above, the extension portion is bent and extended toward the center portion in the vehicle width direction at the lower end of the back pillar reinforcement, and the extension portion is joined to the outer surface of the rear end cross member. As a simple configuration in which the second cross section in the vehicle width direction is formed in the closed cross section in the vehicle width direction, a dedicated reinforcing structure member or the like is not required, so that the number of parts and the number of assembling work steps are increased. It is possible to obtain cost and weight advantageously without accompanying.

According to the second aspect, in addition to the effect of the first aspect, the second closed section in the vehicle width direction is formed up to a position intersecting the rear end of the rear side member, and the rear side member and the rear floor are formed. The torsional load acting on the back pillar can be directly distributed to the front and rear closed cross sections so that the front and rear closed cross sections of the panel and the second vehicle width direction are orthogonal to each other. Therefore, the strength and rigidity around the rear opening of the vehicle body can be further increased.

According to the third aspect, in addition to the effects of the first and second aspects, since the rear end panel is connected to the extension portion at the seat portion of the extension portion, the surface rigidity of the rear end panel is increased. As a result, the strength and rigidity around the rear opening of the vehicle body can be further increased.

According to a fourth aspect of the present invention, in addition to the effect of the third aspect, the end portion of the extension portion having the seat portion is closed by a box-shaped seat block member to close the end portion in the second vehicle width direction. Since the connecting portion between the cross section and the rear end of the rear side member is hardened, the strength and rigidity around the rear opening of the vehicle body can be further increased, and the rear bumper is provided at the portion where the seat block member is provided. Since the stays are connected, the mounting rigidity of the rear bumper stay can be increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a floor panel, and a rear side member 3 having an inverted hat-shaped cross section is joined to the lower surface of both sides along the side of the rear wheel house inner 2 to run longitudinally in the front-rear direction. A closed cross section 4 is formed.

A side edge of the rear floor panel 1 and a side edge of the rear wheel house inner 2 are joined to a rear side inner panel 5.

At the rear edge of the rear floor panel 1, a flange 1 is provided.
a is bent upward, and the flange 1 a is joined to the rear end cross member 6.

The rear end cross member 6 has a substantially U-shaped cross section with its central portion excluding the left and right sides facing rearward. The rear end cross member 6 is provided outside the rear end cross member 6 via upper and lower edge flanges 6a, 7a. The rear end panel 7 is joined to the rear end cross member 6 and the rear end panel 7 to form a closed cross section 8 in the vehicle width direction.

Reference numeral 9 denotes a back pillar in which a back pillar inner 10 and a back pillar reinforce 11 form a vertically closed cross section 12.

The back pillar inner 10 has a substantially L-shaped cross section, and the lower leg 13 overlaps the side of the rear end cross member 6 and overlaps along the rear edge of the rear side inner panel 5. The rear end cross member 6 and the rear side inner panel 5 are joined to each other, and the leg portion 13 is provided with a joint portion 14 extending toward the center in the vehicle width direction.
10b which is superimposed on the back surface of the upper wall of the
Are overlapped on the upper edge flange 6a of the rear end cross member 6 and are respectively joined.

The back pillar reinforce 11 is formed in a substantially channel-shaped cross section, and a side flange 11 a formed by wrapping around from the front side to the lower side is aligned with the front peripheral edge 10 a of the back pillar inner 10. The rear side inner panel 5 is overlapped and joined, and the rear peripheral flange 11b is overlapped and joined to the rear wall of the back pillar inner 10.

At the lower end of the back pillar reinforce 11, an extension portion 15 having a substantially U-shaped cross section bent toward the center in the vehicle width direction is integrally provided.

The extension portion 15 is formed as an extension of the rear end wall, the outer wall and the rear inner wall of the back pillar reinforce 11, and a rear peripheral flange 11b and a lower edge flange 15a continuous with the upper edge.
Are overlapped and joined to the outer surface of the rear end cross member 6, and the extension portion 15 and the rear end cross member 6 are formed in the closed cross section 8 in the vehicle width direction including the rear end cross member 6 and the rear end panel 7. A second closed section 16 in the vehicle width direction is formed to be continuous with the vertically closed section 12 of the back pillar 9.

In this embodiment, the extension portion 15 is formed up to a position intersecting the rear end of the rear side member 3 so that the closed cross section 4 in the front-rear direction and the closed cross section 16 in the second vehicle width direction are orthogonal to each other. I have to do it.

Further, a sheet portion 17 is formed on the rear wall of the end portion of the extension portion 15 by bulging so as to connect the extension portion 15 to the rear end panel 7 through the sheet portion 17 as described later. It is.

Further, a box-shaped sheet block member 18 formed according to the cross-sectional shape is fitted and joined to the end of the extension portion 15 having the seat portion 17 formed therein. The member 18 is mounted on the extension of the rear end of the rear
The end of the second vehicle width direction closed cross section 16 is closed by being joined to the outer side surface of the rear end cross member 6 via 8a, and the bumper stay 23 of the rear bumper 22 is connected to the rear end panel 7 and It is fastened and fixed to the seat block member 18 by bolts and nuts 19 with the seat portion 17 interposed therebetween.

Reference numeral 20 denotes a rear fender panel. The rear fender panel 20 includes a pillar portion 21 including the back pillar 9, and a peripheral flange 21a on the front side of the pillar portion 21 is connected to a side flange 11a of the back pillar reinforcement 11. And is joined to the upper edge of the rear side inner panel 5 so as to be joined, and the rear peripheral flange 21b is connected to the rear peripheral flange 1 of the back pillar reinforcement 11.
1b and the upper end flange 7a of the rear end panel 7 so as to be aligned and joined, and the lower edge flange 21c is abutted against the side edge flange 7b of the rear end panel 7 and overlapped and joined to the rear side inner panel 5. It is.

According to the structure of the above embodiment, the back pillar reinforce 11 has an extension portion 1 having a substantially U-shaped cross section bent at the lower end toward the center in the vehicle width direction.
5, the extension portion 15 is joined to the outer surface of the rear end cross member 6, and the back portion is inserted into the closed cross section 8 in the vehicle width direction, which is formed by the rear end cross member 6 and the rear end panel 7. Since the second closed section 16 in the vehicle width direction is formed continuously with the closed section 12 in the vertical direction of the pillar 9, the closed section 12 in the vertical direction of the back pillar 9 and the closed section in the vehicle width direction are formed. Are connected to each other so that the vertical frame member and the vehicle width direction frame member are connected to each other, and at the portion where the lower end portion of the back pillar 9 is connected, the closed cross section 8 in the vehicle width direction is the second section. The cross-section 16 in the vehicle width direction has a multiple closed cross-section structure. As a result, the strength and rigidity around the rear opening of the vehicle body can be further increased.

Further, as described above, the extension portion 15 is bent and extended toward the center in the vehicle width direction at the lower end portion of the back pillar reinforcement 11, and the extension portion 15 is attached to the outer surface of the rear end cross member 6. And a simple structure in which the second closed section 16 in the vehicle width direction is formed in the closed section 8 in the vehicle width direction, a special reinforcing structural member or the like is not required. It is possible to obtain the cost and weight advantageously without increasing the number of additional work steps.

In the present embodiment, in particular, the second vehicle width direction closed cross section 16 comprising the above-mentioned extension portion 15 and the rear end cross member 6 extends to a position where it crosses the rear end of the rear side member 3. The rear pillar 9 is formed so that the front-rear closed section 4 composed of the rear side member 3 and the rear floor panel 1 and the second vehicle width direction closed section 16 are orthogonal to each other. The torsional load acting on the vehicle body can be directly distributed and burdened on the front-rear closed section 4, and the rigidity around the rear opening of the vehicle body can be further increased.

The end of the extension part 15 is connected to the rear end panel 7 via the seat part 17 to increase the surface rigidity of the rear end panel 7, and the end of the extension part 15 has a seat block. The member 18 is fitted and fixed, and the seat block member 18 is joined to the rear end cross member 6 on the extension of the rear end of the rear side member 3 to form an end of the second vehicle width direction closed cross section 16. Since it is closed, the strength and rigidity around the rear opening of the vehicle body can be further increased.

Further, stay 2 of the rear bumper 22
Since the rear bumper stay 23 is fastened and fixed to the seat block member 18 with the bolts and nuts 19 sandwiching the rear side member 7 and the seat portion 17 over the extension of the rear side member 3, the mounting rigidity of the rear bumper stay 23 can be increased. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rear floor panel 3 rear side member 4 front-rear closed section 5 rear side inner panel 7 rear end panel 8 vehicle width direction closed section 9 back pillar 10 back pillar inner 11 back pillar reinforce 12 vertical closed section 15 extension section 16 Second closed width section in the vehicle width direction 17 Seat section 23 Rear bumper stay

Claims (4)

[Claims] 1. A closed cross section extending in the vehicle width direction is formed by a rear end cross member joined to a floor end of a rear floor panel and a rear end panel joined to the outside of the rear end cross member, while a floor of the rear floor panel is formed. A back pillar having a closed cross section extending in the vertical direction is formed by a back pillar inner having a lower end joined to a rear side inner panel and a rear end panel joined to a side, and a back pillar reinforce joined to the outside of the back pillar inner. In the formed structure, an extension portion bent toward the center in the vehicle width direction is extended at a lower end portion of the back pillar reinforce, and the extension portion is joined to an outer surface of a rear end cross member to form the rear end cross member. Closed cross section in the vehicle width direction formed by the rear end panel A rear body structure of an automobile, wherein a closed cross-section in the second vehicle width direction is formed in the interior of the back pillar by the extension portion and the rear end cross member. 2. A second vehicle width direction closed cross section is formed up to a position crossing a rear end of a rear side member joined to a lower surface of a rear floor panel in a front-rear direction, and formed by the rear side member and the rear floor panel. The rear body structure of an automobile according to claim 1, wherein the closed cross section in the front-rear direction and the closed cross section in the second vehicle width direction are orthogonal to each other. 3. The rear end panel according to claim 1, wherein a sheet portion is bulged and formed on a rear wall of an end portion of the extension portion, and the extension portion is connected to the rear end panel via the sheet portion. Rear body structure of the car. 4. A box-shaped seat formed on the extension of the rear end of the rear side member and at the end of the extension formed with the seat in accordance with its inner cross-sectional shape. The block member is fitted and fixed, and the seat block member is joined to the outer side surface of the rear end cross member to close the end of the second closed section in the vehicle width direction, and the rear bumper stay is connected to the rear end panel and the seat. 4. The rear body structure of an automobile according to claim 3, wherein the vehicle body is fixedly connected to the seat block member with the portion interposed therebetween.