JP3269347B2 - Car back pillar structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle back pillar structure.

[0002]

2. Description of the Related Art As a conventional back pillar structure of an automobile, for example, one shown in FIGS. 6 and 7 is known (for a similar technique, see Japanese Patent Application Laid-Open No. 61-247577).

A back pillar 1 is formed at the rear of an automobile (wagon car). The back pillar 1 connects the body body 2 and the roof 3 up and down, and has a closed cross-sectional structure formed by an inner panel 4 and an outer panel 5. An upper reinforcement 6 is joined together at the front and rear ends in the back pillar 1.

An upper part of the lower reinforcement 7 is connected to a lower part of the upper reinforcement 6. That is, the joint portion 8 is set at the lower portion of the upper reinforcement 6, and the overlap portion 9 formed at the upper portion of the lower reinforcement 7 is joined to the joint portion 8 so as to overlap from the outside. I have. The overlap portion 9 has a cross-sectional shape corresponding to the joint portion 8 and is closely joined to the joint portion 8.

[0005]

However, in such a conventional technique, the overlapping portion 9 of the lower reinforcement 7 is connected to the connecting portion 8 of the upper reinforcement 6.
The upper reinforcement 6 and the lower reinforcement 7 are not necessarily sufficiently strong in the vehicle width direction X because the upper reinforcement 6 and the lower reinforcement 7 are not sufficiently connected to each other due to the weight of the roof 3. There is a possibility that the vehicle may be tilted toward the inside of the vehicle body and affect assembly accuracy of the vehicle body.

Further, since the coupling strength between the upper reinforcement 6 and the lower reinforcement 7 is low, the road surface input applied upward from the lower part of the vehicle body is effectively transmitted to the roof 3 via the lower reinforcement 7 and the upper reinforcement 6. From the viewpoint of securing the overall rigidity of the back pillar 1.

Therefore, as a countermeasure against this, it is necessary to increase the plate thickness of the upper reinforcement 6 and the lower reinforcement 7 to increase the coupling rigidity of the two, thereby increasing the weight of the vehicle body.

The present invention has been made by paying attention to such a conventional technique, and provides a back pillar structure of an automobile having a high coupling strength between an upper reinforcement and a lower reinforcement.

[0009]

According to the first aspect of the present invention,
The upper and lower ends of the overlapping portion of the lower reinforcement are joined to the joining portion of the upper reinforcement to form a closed cross section between the joining portion and the overlapping portion.

According to the first aspect of the present invention, since a closed cross section is formed between the joint portion of the upper reinforcement and the overlap portion of the lower reinforcement, the joint strength of both is improved. In addition, it has a closed cross section in both the vertical and horizontal directions, and exhibits high rigidity in front, rear, left, right, and torsion directions.

According to a second aspect of the present invention, the front pillars of the outer panel and the inner panel and the rear flanges of the inner panel are joined together with the front and rear ends of the corresponding upper reinforce interposed therebetween, thereby providing a back pillar. The front and rear joints are formed, and the positions of the front and rear joints in the vehicle width direction are different from each other, and the front and rear ends of the joint of the upper reinforce are respectively directed to opposite sides in the vehicle width direction. An inclined surface portion is formed.

According to the second aspect of the present invention, since the connecting portions of the upper reinforce are formed with inclined surfaces facing the opposite sides in the vehicle width direction from the front end and the rear end, respectively, the joints are formed due to the existence of the inclined surfaces. The strength of the portion in the vehicle width direction is improved, and as a result, the coupling strength in the vehicle width direction between the upper reinforcement and the lower reinforcement is improved.

According to a third aspect of the present invention, an inclined surface is formed in the overlap portion, and the inclined surface is joined to the inclined surface of the connecting portion.

According to the third aspect of the present invention, since the inclined portion is also formed on the overlap portion, the strength of the overlap portion in the vehicle width direction is improved, and the upper reinforcement and the lower reinforcement are connected in the vehicle width direction. The bonding strength at the point is further improved.

According to a fourth aspect of the present invention, the concave portion is formed in the joint portion of the upper reinforcement, and the overlap portion is formed with a substantially flat surface in the vertical direction.

According to the fourth aspect of the present invention, the concave portion is formed in the coupling portion of the upper reinforcement, and the overlap portion is formed with a substantially flat surface in the vertical direction.
An upward input applied from the lower side of the lower reinforcement can be directly and efficiently transmitted to the upper reinforcement through the substantially flat overlap portion.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

The outer panel 11 and the inner panel 12 of the back pillar 10 of this embodiment are respectively formed by front end flanges 11a, 12a and rear end flanges 11b, 12b.
Are joined while sandwiching the front end 13a and the rear end 13b of the upper reinforcement 13, respectively. And
The positions of the joints 14 and 15 joined at the front end and the rear end of the back pillar 10 by three each differ from each other in the vehicle width direction X. That is, the front joint 14 is located outside, and the rear joint 15 is located inside.

The coupling portion 16 of the upper reinforcement 13 provided in the back pillar 10 is provided with a concave portion 17 formed inside the general surface. From the front end 13a and the rear end 13b of the upper reinforce 13, inclined surfaces 18 and 19 are formed, respectively, facing in opposite directions in the vehicle width direction X. That is, an inclined surface portion 19 extending outward from the rear end 13b located inside is formed, and an inclined surface portion 18 extending inward from the front end 13a located outside. Then, both inclined surface portions 18, 1
Numerals 9 are respectively continuous with the recesses 17 at the center of the back pillar 10.

On the other hand, the overlapping portion 21 of the lower reinforcement 20 is also formed with an inclined surface portion 22 corresponding to the inclined surface portion 19 of the connecting portion 16, and the rear end 20b of the overlapping portion 21 is formed by the inclined surface portion. It is formed continuously at 22 terminals. Also, the front end 20 of the overlap portion 21
“a” has a shape bent and formed into a flange shape. The overlap portion 21 is entirely formed of a flat surface in the vertical direction except that the upper end 20c is slightly bent inward, and the lower end 20d is also set to the flat portion.

The overlapping portion 21 of the lower reinforcement 20 having such a shape is attached to the connecting portion 16 of the upper reinforce 13. That is, the upper end 20c and the lower end 20d of the overlap portion 21
Are spot-welded to the upper and lower portions of the concave portion 17 formed in the joint portion 16 respectively (* marks in FIG. 2 are spot welding points),
The front end 20a is welded to the concave portion 17 and the rear end 20b is welded to the inclined surface portion 19 of the connecting portion 16 together with the inclined surface portion 22. By welding the overlap portion 21 to the joint portion 16, a closed cross section H is formed between the overlap portion 21 and the joint portion 16 in both the horizontal direction (see FIG. 4) and the vertical direction (see FIG. 5). Is done.

Since such a closed section H is formed between the overlapping portion 21 and the connecting portion 16, the connecting strength between the upper reinforcement 13 and the lower reinforcement 20 is improved in the front-rear, left-right, and torsion directions. . Therefore,
Even if the weight of the roof 3 is added to the upper part of the upper reinforce 13, the upper reinforce 13 is not deformed so as to be inclined inward.

Further, since the coupling rigidity between the upper reinforcement 13 and the lower reinforcement 20 is high, even if an upward road surface input is applied to the lower part of the lower reinforcement 20, the input is applied to the lower reinforcement 20 and the upper reinforcement 20. 13 can be reliably transmitted to the roof 3 in a distributed manner. In particular, in this embodiment, since substantially the entire overlap portion 21 is formed by a flat surface in the vertical direction, an upward road surface input applied to the lower part of the lower reinforcement 20 is directly and directly applied to the upper reinforcement 13. It can be transmitted efficiently.

Further, the connecting portion 16 of the upper reinforce 13 is formed with inclined surfaces 18 and 19 at the front and rear, respectively.
6 in the vehicle width direction X is improved. Therefore, the joint 1
By improving the strength of No. 6, the coupling strength in the vehicle width direction X between the upper reinforcement 13 and the lower reinforcement 20 is also improved.

In addition, since the overlapping portion 21 is also provided with the inclined surface portion 22 joined to the inclined surface portion 19, the presence of the inclined surface portion 22 causes the overlapping portion 21
In the vehicle width direction X is also improved, which also contributes to the improvement of the connection strength.

[0026]

According to the first aspect of the present invention, since a closed cross section is formed between the joint portion of the upper reinforcement and the overlap portion of the lower reinforcement, the joint strength of both is improved. In addition, it has a closed cross section in both the vertical and horizontal directions, and exhibits high rigidity in front, rear, left, right, and torsion directions.

According to the second aspect of the present invention, since the connecting portions of the upper reinforcement are formed with the inclined surfaces facing the opposite sides in the vehicle width direction from the front end and the rear end, respectively, the joints are formed due to the existence of the inclined surfaces. The strength of the portion in the vehicle width direction is improved, and as a result, the coupling strength in the vehicle width direction between the upper reinforcement and the lower reinforcement is improved.

According to the third aspect of the present invention, since the inclined portion is also formed in the overlap portion, the strength of the overlap portion in the vehicle width direction is improved, and the upper reinforce and the lower reinforcement in the vehicle width direction. The bonding strength at the point is further improved.

According to the fourth aspect of the present invention, since the concave portion is formed in the joint portion of the upper reinforcement and the overlap portion is formed with a substantially flat surface in the vertical direction,
An upward input applied from the lower side of the lower reinforcement can be directly and efficiently transmitted to the upper reinforcement through the substantially flat overlap portion.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an internal structure of a back pillar according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an upper reinforcement and a lower reinforcement in a coupled state.

FIG. 3 is a perspective view showing an upper reinforcement and a lower reinforcement before connection.

FIG. 4 is a sectional view taken along the line SA-SA shown in FIG. 2;

FIG. 5 is a sectional view taken along the line SB-SB shown in FIG. 2;

FIG. 6 is a schematic side view showing the internal structure of a back pillar according to a conventional example.

FIG. 7 is a sectional view taken along the line SC-SC shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Back pillar 11 Outer panel 12 Inner panel 13 Upper reinforcement 16 Coupling part 18, 19 Inclined surface part (coupling part) 20 Lower reinforcement 20a Front end 20b Rear end 20c Upper end 20d Lower end 21 Overlap part 22 Inclination part H Closed section X car width direction

Claims (4)

(57) [Claims] 1. An automobile having an upper reinforcement provided in a back pillar formed by joining an outer panel and an inner panel, and an overlap portion on an upper part of the lower reinforcement being connected to a joint part on a lower part of the upper reinforcement. A back pillar structure for an automobile, wherein a front and rear end and upper and lower ends of an overlap portion are joined to the joint portion to form a closed cross section between the joint portion and the overlap portion. 2. The front and rear joints of the back pillar are joined by joining the front end flanges and the rear end flanges of the outer panel and the inner panel with the front end and the rear end of the corresponding upper reinforcement sandwiched therebetween. The upper and lower joints are formed so that the positions of the front and rear joints in the vehicle width direction are different from each other, and the inclined surfaces are respectively directed to the opposite sides in the vehicle width direction from the front end and the rear end of the joint of the upper reinforcement. Item 4. A back pillar structure for an automobile according to item 1. 3. The back pillar structure for an automobile according to claim 2, wherein an inclined surface is formed in the overlap portion, and the inclined surface is joined to the inclined surface of the connecting portion. 4. The back of an automobile according to claim 1, wherein a concave portion is formed in the coupling portion of the upper reinforcement, and the overlap portion is formed with a substantially flat surface in a vertical direction. Pillar structure.