JP2023103738A - Vehicle body rear part structure - Google Patents

Abstract

To provide a vehicle body rear part structure which enables reduction of deformation of a back door opening to improve torsional rigidity of a vehicle body while inhibiting increase of the weight of a vehicle and manufacturing costs.SOLUTION: Left and right back side pillars 13 at a back door opening 1 having an annular structure have an outer panel part 13A and an inner panel part 13B extending in a vehicle vertical direction. The inner panel part 13B has: a first inner panel member extending from an end portion of the outer panel part 13A to the vehicle inner side; and a second inner panel member joined to the first inner panel member. Each back side pillar 13 has an extension part 50 which extends from a joint portion J2 between the first and second inner panel members to the vehicle outer side and is joined to a vehicle inner surface of the outer panel part 13A. The outer panel part 13A and the inner panel part 13B including the extension part 50 form a closed cross section structure C1 extending in the vehicle vertical direction.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle body rear structure.

2. Description of the Related Art In general, a structure having a back door opening that is openable and closable with a back door is known as a rear body structure of a vehicle such as an automobile. The conventional back door opening includes a roof back cross member located on the upper side of the vehicle and extending in the vehicle width direction, a floor back cross member located on the lower side of the vehicle and extending in the vehicle width direction, and a floor back cross member located on the left and right sides and extending in the vehicle vertical direction. There is a structure in which a ring structure is formed by connecting back side pillars extending vertically (see, for example, Patent Document 1).

JP 2012-240515 A

In the conventional vehicle body rear structure having the annular back door opening as described above, the roof back cross member on the upper side of the vehicle and the floor back cross member on the lower side of the vehicle are formed to have a substantially rectangular cross section extending in the vehicle width direction. The rigidity of the back door opening has been enhanced by having a closed cross-sectional structure that is reinforced. On the other hand, for the back side pillars on both the left and right sides, due to reasons such as the panel structure on the rear side of the vehicle body and manufacturing reasons, a closed cross-sectional structure with a substantially square cross-section like the roof back cross member and floor back cross member was adopted. In some cases, it was difficult to form (see, for example, FIG. 8 of Patent Document 1 above).

In this case, at the back door opening, the rigidity of the back side pillar becomes lower than the rigidity of the roof back cross member and the floor back cross member, and the amount of deformation of the back side pillar increases. Since the rigidity of the back door opening affects the rigidity of the rear part of the vehicle body, it is difficult to improve the torsional rigidity of the entire vehicle body.

In addition, in order to suppress the deformation of the back side pillar, if a reinforcing member is added to the back side pillar or the plate thickness of the constituent members of the back side pillar is increased, the vehicle weight and manufacturing cost will increase. There was a possibility that it would become a factor.

The present invention has been made in view of the above points, and provides a rear body structure that can reduce deformation of the back door opening and improve the torsional rigidity of the vehicle body while suppressing increases in vehicle weight and manufacturing costs. intended to provide

In order to achieve the above object, one aspect of the present invention includes a back door opening provided in the rear portion of the vehicle body, and the back door opening includes a roof back cross member positioned on the upper side of the vehicle and extending in the vehicle width direction. A floor back cross member located on the lower side of the vehicle and extending in the vehicle width direction and back side pillars located on both left and right sides and extending in the vehicle vertical direction are connected to each other to form an annular structure. has an outer panel portion extending in the vehicle vertical direction, and an inner panel portion disposed on the vehicle inner side of the outer panel portion and extending in the vehicle vertical direction, and an end portion of the outer panel portion along the vehicle vertical direction is connected to the inner panel. To provide a vehicle body rear portion structure joined to an end portion along the vertical direction of a vehicle. In this vehicle body rear portion structure, the inner panel portion includes: a first inner panel member extending toward the vehicle inner side from the end portion of the outer panel portion; and a second inner panel member arranged spaced apart on the inner side of the vehicle, the backside pillar extending outward from the joint of the first and second inner panel members toward the outer side of the vehicle. said inner panel including said outer panel portion and said extending portion; A closed cross-sectional structure extending in the vertical direction of the vehicle is formed by the portion.

According to the vehicle body rear portion structure of the present invention, it is possible to reduce the deformation of the back door opening and improve the torsional rigidity of the vehicle body while suppressing increases in vehicle weight and manufacturing costs.

1 is a perspective view of a vehicle body to which a vehicle body rear portion structure according to an embodiment of the present invention is applied, viewed obliquely from the rear; FIG. FIG. 2 is a cross-sectional view of the rear portion of the vehicle body of FIG. 1 taken along line AA and viewed from the front of the vehicle; FIG. 3 is an enlarged cross-sectional view showing the X section of FIG. 2; It is the perspective view which looked at FIG. 3 from the vehicle diagonal front. 4 is a cross-sectional view taken along the line BB of FIG. 3; FIG. 4 is a cross-sectional view taken along line CC of FIG. 3; FIG. 4 is a cross-sectional view taken along line DD of FIG. 3; FIG. It is a sectional view of the back side pillar in the 1st modification relevant to the above-mentioned embodiment. It is a sectional view of the back side pillar in the 2nd modification related to the above-mentioned embodiment. It is a sectional view of the back side pillar in the 3rd modification relevant to the above-mentioned embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a vehicle body to which a vehicle body rear portion structure according to an embodiment of the present invention is applied, viewed obliquely from the rear. FIG. 2 is a cross-sectional view of the rear portion of the vehicle body in FIG. 1 taken along line AA and viewed from the front of the vehicle. In each figure described below, the arrow Fr direction indicates the front in the longitudinal direction of the vehicle, the arrow U direction indicates the upper direction in the vehicle vertical direction, and the arrow R direction indicates the right direction in the vehicle width direction. Further, "left and right" in the description of the embodiment correspond to left and right when the front of the vehicle is viewed from inside the vehicle compartment.

1 and 2, the vehicle to which the vehicle body rear portion structure of the present embodiment is applied has a back door opening 1 provided at the vehicle body rear portion. The back door opening 1 is covered with a back door (not shown) so that it can be opened and closed. A roof panel portion 2 extending in the longitudinal direction and the width direction of the vehicle is provided on the upper portion of the vehicle body. A roof back cross member 11 is arranged at the rear end portion of the roof panel portion 2 . The roof back cross member 11 is positioned on the vehicle upper side of the back door opening 1 and extends in the vehicle width direction. Although not shown, the roof back cross member 11 has a substantially rectangular cross section and has a closed cross-sectional structure extending in the vehicle width direction. Left and right side body panel portions 3 constituting vehicle body side portions are respectively joined to both end portions of the roof panel portion 2 in the vehicle width direction. The side body panel portion 3 extends in the longitudinal direction and the vertical direction of the vehicle, and the upper end portion is curved inward in the vehicle width direction and connected to the roof panel portion 2 .

The side body panel portion 3 has a side body outer panel 31 and a side body inner panel 32 arranged on the inner side of the side body outer panel 31, as shown in FIG. A roof side rail 4 extending in the longitudinal direction of the vehicle is provided inside the upper end portion of the side body outer panel 31 . A quarter window opening 33 for installing a quarter window glass is formed in the rear upper portion of the side body outer panel 31 (FIGS. 1 and 2). A reinforcing member 34 extending in the vehicle front-rear direction is joined to a vehicle lower portion of the quarter window opening 33 on the vehicle inner side surface of the side body outer panel 31 ( FIG. 2 ). The reinforcing member 34 has a hat-shaped cross section that is convex inward in the vehicle width direction. A rear end portion of the reinforcing member 34 is joined to a backside pillar 13 to be described later.

A fuel filler port 35 is formed below the quarter window opening 33 in the left side body outer panel 31 . A recessed portion 36 recessed inward in the vehicle width direction is formed below the fuel filler port 35 , and the recessed portion 36 is also formed in the right side body outer panel 31 . A slide rail 5 extending in the vehicle front-rear direction is attached to the vehicle outer side surface of the recessed portion 36 . The slide rail 5 is configured to guide the sliding movement of a rear door (not shown).

Furthermore, a rear floor panel portion 7 extending in the vehicle front-rear direction and vehicle width direction is joined to the lower end portions of the rear portions of the left and right side body outer panels 31 via the left and right rear tire house panels 6 . The rear tire house panel 6 defines an accommodation space for rear tires. The vehicle width direction inner lower end portions of the left and right rear tire house panels 6 and the vehicle width direction both side portions of the rear floor panel portion 7 are joined to left and right side members 8 extending in the vehicle front-rear direction (FIG. 2). The central portion of the rear floor panel portion 7 in the vehicle width direction is recessed outward (downward) of the vehicle, and has a shape capable of accommodating a spare tire and the like. A floor back cross member 12 is arranged at the rear end portion of the rear floor panel portion 7 . The floor back cross member 12 is positioned on the vehicle lower side of the back door opening 1 and extends in the vehicle width direction. Although not shown, the floor back cross member 12 has a substantially rectangular cross section and has a closed cross-sectional structure extending in the vehicle width direction.

As shown in FIGS. 1 and 2, left and right back side pillars 13 are arranged at the rear end portions of the left and right side body panel portions 3, respectively. The backside pillars 13 are positioned on both left and right sides of the backdoor opening 1 and have a closed cross-sectional structure extending in the vertical direction of the vehicle as will be described later in detail.

In the back door opening 1 in the vehicle body rear structure of the present embodiment, a roof back cross member 11 on the upper side of the vehicle, a floor back cross member 12 on the lower side of the vehicle, and back side pillars 13 on both left and right sides are connected to each other to form an annular structure. is formed. In this annular structure, an annular ridge is formed by the inner edge of the back door opening 1, and the closed cross section continues along the ridge. In the following, the detailed structure of the back door opening 1 will be described in detail with specific examples centering on the back side pillar 13 . Here, the structure of the right backside pillar 13 will be described, and the description of the structure of the left backside pillar 13 similar to the structure will be omitted.

3 is an enlarged cross-sectional view showing the X section of FIG. 2. FIG. FIG. 4 is a perspective view of FIG. 3 viewed obliquely from the front of the vehicle. However, FIGS. 3 and 4 show a state in which the side body inner panel 32 and the rear tire house panel 6 are removed. The two-dot chain line in FIG. 3 represents the approximate positions of the side body inner panel 32 and the rear tire house panel 6. As shown in FIG. 5 is a cross-sectional view taken along the line BB of FIG. 3, FIG. 6 is a cross-sectional view taken along the line CC of FIG. 3, and FIG. 7 is a cross-sectional view taken along the line DD of FIG.

As shown in FIGS. 3 to 7, the right back side pillar 13 in the back door opening 1 includes an outer panel portion 13A extending in the vertical direction of the vehicle and an inner panel portion 13A disposed on the inner side of the outer panel portion 13A and extending in the vertical direction of the vehicle. and a panel portion 13B. An end portion of the outer panel portion 13A along the vehicle vertical direction is joined to an end portion of the inner panel portion 13B along the vehicle vertical direction.

In the backside pillar 13 according to the present embodiment, the outer panel portion 13A includes a rear portion of the side body outer panel 31 described above, a pillar outer upper panel 41 (FIGS. 6 and 7) and a pillar outer lower panel 43 (FIG. 7) extending in the vertical direction of the vehicle. 5). The rear part of the side body outer panel 31 mainly forms the outer surface of the backside pillar 13 in the vehicle width direction. The pillar outer upper panel 41 and the pillar outer lower panel 43 form the rear surface of the backside pillar 13 .

The inner panel portion 13B includes a rear portion of the side body inner panel 32 described above, a pillar inner upper panel 42 (FIGS. 3, 4, 6 and 7) and a pillar inner lower panel 44 (FIG. 7) extending in the vehicle vertical direction. 3 to 5). The rear part of the side body inner panel 32 , the pillar inner upper panel 42 and the pillar inner lower panel 44 form the vehicle width direction inner surface of the back side pillar 13 . In this embodiment, the pillar inner upper panel 42 and the pillar inner lower panel 44 correspond to the "first inner panel member" of the invention, and the side body inner panel 32 corresponds to the "second inner panel member" of the invention. do.

Specifically, as shown in FIGS. 5 to 7, the rear end portion 31A of the side body outer panel 31 has a shape bent inward in the vehicle width direction. At the vehicle width direction inner end portion 31B of the side body outer panel 31, the vehicle width direction outer end portion 41A (FIGS. 6 and 7) of the pillar outer upper panel 41 and the vehicle width direction outer end portion of the pillar outer lower panel 43 are attached. Portion 43A (FIG. 5) is joined. An upper end portion of a pillar outer lower panel 43 is joined to a lower end portion of the pillar outer upper panel 41 . The panels forming the outer panel portion 13A of the backside pillar 13 can be joined together by spot welding or by using an adhesive such as a mastic sealer.

As shown in FIGS. 6 and 7, the pillar outer upper panel 41 has an inner end in the vehicle width direction formed with a flange portion 41B projecting rearward of the vehicle. It is joined to the rear end portion 42A. The pillar inner upper panel 42 extends toward the vehicle front side from the joint J1 with the flange portion 41B of the pillar outer upper panel 41, then bends outward in the vehicle width direction and extends outward in the vehicle width direction from the bent portion 42B. extending towards. A flange portion 42C projecting toward the vehicle front side is formed at the outer end portion of the pillar inner upper panel 42 in the vehicle width direction, and the flange portion 42C is formed on the upper portion of the surface 31C facing the vehicle width direction inner side of the side body outer panel 31. are spliced. Preferably, the flange portion 42C of the pillar inner upper panel 42 and the side body outer panel 31 are joined using an adhesive A such as a mastic sealer.

As shown in FIG. 5, the pillar outer lower panel 43 has an inner end portion in the vehicle width direction formed with a flange portion 43B projecting toward the rear side of the vehicle. are spliced. As shown in FIGS. 5 and 6, the pillar inner lower panel 44 extends toward the vehicle front side from the joint J1 with the flange portion 43B of the pillar outer lower panel 43, and then bends outward in the vehicle width direction. It extends outward in the vehicle width direction from the portion 44B. A flange portion 44C projecting toward the vehicle front side is formed at the outer end portion of the pillar inner lower panel 44 in the vehicle width direction, and the flange portion 44C is formed on the lower portion of the surface 31C facing the vehicle width direction inner side of the side body outer panel 31. are spliced. Preferably, the flange portion 44C of the pillar inner lower panel 44 and the side body outer panel 31 are joined using an adhesive A such as a mastic sealer.

As shown in FIGS. 3, 5 and 6, the side body inner panel 32 is joined to the vehicle width direction intermediate portions of the pillar inner upper panel 42 and the pillar inner lower panel 44, respectively. A flange portion 32A projecting inward in the vehicle width direction is formed at the rear end portion of the side body inner panel 32, and the flange portion 32A is spotted on the surface of each of the pillar inner upper panel 42 and the pillar inner lower panel 44 facing the front of the vehicle. Welded or glued together.

In this embodiment, each of the pillar inner upper panel 42 and the pillar inner lower panel 44 is joined to the surface 31C facing the vehicle width direction inner side of the side body outer panel 31 from the joint J2 to the flange portion 32A of the side body inner panel 32. The portion located between the flange portions 42C and 44C which are connected to each other corresponds to the "extending portion" of the present invention. In the following description, the relevant portions of the pillar inner upper panel 42 and the pillar inner lower panel 44 are referred to as "extending portions 50".

In other words, the back side pillar 13 in this embodiment extends from the joint J2 between the pillar inner upper panel 42 and the pillar inner lower panel 44 (first inner panel member) and the side body inner panel 32 (second inner panel member) to the width of the vehicle. It has an extending portion 50 that extends outward in the direction (vehicle outer side) and is joined to a surface 31C (vehicle inner side surface of the outer panel portion 13A) of the side body outer panel 31 facing the vehicle width direction inner side. The extending portion 50 is composed of a pillar inner upper panel 42 and a pillar inner lower panel 44 (first inner panel member).

In the backside pillar 13 of the present embodiment as described above, the pillar includes the rear portion of the side body outer panel 31, the pillar outer upper panel 41 and the pillar outer lower panel 43, and the extension portion 50, which constitute the outer panel portion 13A. The inner upper panel 42 and the pillar inner lower panel 44 form a closed cross-sectional structure C1 extending in the vertical direction of the vehicle. In other words, in the present embodiment, in the upper portion of the backside pillar 13, the rear part of the side body outer panel 31, the pillar outer upper panel 41, and the pillar inner upper panel 42 form a substantially rectangular closed cross-sectional structure C1, and , at the lower portion of the back side pillar 13, the rear portion of the side body outer panel 31, the pillar outer lower panel 43, and the pillar inner lower panel 44 form a substantially rectangular closed cross-sectional structure C1, and the upper portion and the lower portion are closed. The cross-sectional structure C1 is continuous in the vertical direction of the vehicle.

Further, in the present embodiment, as shown in FIGS. 2 to 4, the corner portion 14 of the back door opening 1 located on the vehicle lower side is formed in an arc shape when viewed from the front of the vehicle. Specifically, the side wall surface between the rear end portion 44A and the bent portion 44B of the pillar inner lower panel 44 (the inner surface in the vehicle width direction of the lower portion of the backside pillar 13) extends downward toward the vehicle. It is formed in a shape that curves inward in the width direction. The concave portion 36 of the side body outer panel 31 described above is arranged at a height corresponding to the upper end portion 14A of the arc of the corner portion 14 in the vertical direction of the vehicle.

The extending portion 50 of the backside pillar 13 described above extends at least from the upper end portion 14A of the corner portion 14 on the lower side of the back door opening 1 to the reinforcing member 34 on the lower side of the quarter window opening 33 in the vertical direction of the vehicle. It is joined to the surface 31C facing the inner side in the vehicle width direction of the side body outer panel 31 over the range. In the present embodiment, as shown in FIG. 2 , the vehicle width direction outer end portions of the pillar inner upper panel 42 and the pillar inner lower panel 44 (extending portion 50) extend over the entire back side pillar 13 in the vertical direction. outer end portion) is joined to a surface 31C of the side body outer panel 31 facing inward in the vehicle width direction. At this time, it is desirable that the lower portion 44D of the pillar inner lower panel 44 on the outer side in the vehicle width direction is joined to the concave portion 36 of the side body outer panel 31, as shown in FIGS.

In addition, the pillar inner lower panel 44 is formed with a convex portion 44</b>E that protrudes toward the vehicle front side at the vehicle lower side of the joint with the concave portion 36 of the side body outer panel 31 . The convex portion 44</b>E is arranged so as to be in contact with the concave portion 36 of the side body outer panel 31 . The convex portion 44E of the pillar inner lower panel 44 has a corner portion 44F that is convex inward in the vehicle width direction when viewed from the front of the vehicle, and expands upward and downward from the corner portion 44F toward the outside in the vehicle width direction. Preferably, it is formed into a shape. In the present embodiment, the tip portion of the convex portion 44E of the pillar inner lower panel 44, which is expanded upward with respect to the corner portion 44F, is aligned with the lower inclined portion of the vehicle inner surface of the concave portion 36 of the side body outer panel 31. placed in contact with each other. In other words, the convex portion 44E of the pillar inner lower panel 44 is formed in a substantially triangular shape when viewed from the front of the vehicle, and the upper end of the side extending in the vertical direction of the vehicle facing the corner portion 44F located on the inner side in the vehicle width direction is , the recessed portion 36 of the side body outer panel 31 is configured to abut on the inner surface of the vehicle from below.

Next, the operation of the vehicle body rear portion structure according to this embodiment will be described.
In the vehicle body rear structure according to the present embodiment, the left and right back side pillars 13 of the back door opening 1 are provided with an outer panel portion 13A and an inner panel portion 13B, and the inner panel portion 13B is a first inner panel member (pillar inner upper panel 42 and pillar inner lower panel 44), and a second inner panel member (side body inner panel 32). Further, the backside pillar 13 has an extension portion 50 that extends outward from the vehicle from the joint J2 of the first and second inner panel members and is joined to the vehicle inner side surface of the outer panel portion 13A. A projection 50 comprises one of the first and second inner panel members. In such a backside pillar 13, the outer panel portion 13A and the inner panel portion 13B including the extension portion 50 form a closed cross-sectional structure C1 extending in the vertical direction of the vehicle.

Due to the closed cross-sectional structure C1 of the backside pillar 13 as described above, each panel member constituting the backside pillar 13 is prevented from being deformed in each direction of the vehicle inner side and the vehicle outer side in a cross-sectional view viewed from the vehicle vertical direction. Since it becomes possible to prevent this, it becomes possible to reduce the bending deformation of the backside pillar 13 . As a result, the annular structure of the back door opening 1 is such that the roof back cross member 11 on the upper side of the vehicle, the floor back cross member 12 on the lower side of the vehicle, and the back side pillars 13 on both left and right sides each have a closed cross-sectional structure. Therefore, deformation at the back door opening 1 can be reduced. In addition, since the extending portion 50 of the backside pillar 13 is composed of one of the first and second inner panel members, the vehicle weight is slightly increased compared to the above-described conventional structure. Manufacturing costs are almost the same. Therefore, it is possible to reduce the deformation of the back door opening and improve the torsional rigidity of the vehicle body while suppressing increases in vehicle weight and manufacturing costs.

Further, in the vehicle body rear portion structure according to the present embodiment, the extending portion 50 of the backside pillar 13 extends outward in the vehicle width direction from the joint J2 of the first and second inner panel members, and the outer panel portion 13A (side It is joined to a surface 31C of the body outer panel 31) facing the inner side in the vehicle width direction. In such a backside pillar 13, the extending portion 50 serves as a vertical wall portion facing in the vehicle front-rear direction. As a result, it is possible to obtain a resistance in the shear direction of the cross section of the vertical wall portion against torsional deformation about the axis in the longitudinal direction of the vehicle. That is, when the backside pillar 13 is torsionally deformed, the deflection amount of each panel constituting the side surface portion is reduced. Therefore, the bending deformation of the backside pillar 13 can be effectively reduced, and the torsional rigidity of the vehicle body can be further improved.

Furthermore, in the vehicle body rear portion structure according to the present embodiment, the extending portion 50 of the backside pillar 13 extends at least from the upper end portion of the arc-shaped corner portion 14 below the back door opening 1 toward the quarter window in the vertical direction of the vehicle. A range extending over the reinforcing member 34 disposed in the lower portion of the opening 33 is joined to a surface 31C of the outer panel portion 13A (side body outer panel 31) facing the inner side in the vehicle width direction. Since the side body outer panel 31 below the quarter window opening 33 has many flat portions and is relatively vulnerable to torsional deformation, the extending portion 50 is joined to this portion to provide a vertical wall, thereby reducing the back. Torsional deformation of the side pillar 13 can be suppressed more effectively. In particular, if the extending portion 50 and the side body outer panel 31 are joined over the entire vertical direction of the back side pillar 13, the annular back door opening 1 can be closed along the annular ridgeline. Since the structure has a continuous cross section, deformation of the back door opening 1 can be effectively reduced. This makes it possible to further improve the torsional rigidity of the vehicle body.

In addition, in the vehicle body rear portion structure according to the present embodiment, the vehicle width direction outer lower portion of the extending portion 50 of the backside pillar 13 (the vehicle width direction outer lower portion 44D of the pillar inner lower panel 44) is formed by the outer panel portion 13A ( It is joined to the concave portion 36 of the side body outer panel 31). When the side body outer panel 31 is formed with a recessed portion 36 for providing the slide rail 5, the side body outer panel 31 and the back side pillar 13 are easily deformed with the recessed portion 36 as a starting point. Therefore, by joining the extending portion 50 to the recessed portion 36 of the side body outer panel 31, the deformation of the backside pillar 13 can be suppressed more effectively.

Further, in the vehicle body rear portion structure according to the present embodiment, the extending portion 50 (the pillar inner lower panel 44) of the back side pillar 13 is positioned on the vehicle lower side of the joint portion with the concave portion 36 of the side body outer panel 31 and on the vehicle front side. The side body outer panel 31 is arranged so that the convex portion 44E and the concave portion 36 of the side body outer panel 31 are in contact with each other. The convex portion 44E has a corner portion 44F that protrudes inward in the vehicle width direction when viewed from the front of the vehicle, and is formed in a shape that expands vertically from the corner portion 44F toward the outside in the vehicle width direction. Since the surface rigidity of the extending portion 50 is increased by providing the convex portion 44E having such a shape in the extending portion 50, it is possible to further effectively suppress the torsional deformation of the back side pillar 13. Become.

Next, modifications related to the vehicle body rear portion structure according to the present embodiment will be described.
FIG. 8 is a cross-sectional view of the backside pillar 13 in the first modified example. This cross-sectional view shows a state in which the back side pillar 13 of the first modification is cut along line BB of FIG. 3 in the above-described embodiment.

In the above-described embodiment, the extended portion 50 of the backside pillar 13 is an example of the first inner panel member (the pillar inner upper panel 42 and the pillar inner lower panel 44) of the first and second inner panel members. showed that. On the other hand, in the backside pillar 13 in the first modified example, as shown in FIG. The configuration is different from the embodiment described above. Since the structure of the first modified example other than the difference is the same as that of the above-described embodiment, the same reference numerals are given to the corresponding parts, and the description thereof is omitted here.

Specifically, in the backside pillar 13 in the first modified example, the rear end portion of the side body inner panel 32 is bent outward in the vehicle width direction and extends outward in the vehicle width direction from the bent portion 32B. A flange portion 32C projecting toward the front of the vehicle is formed at the outer end portion of the side body inner panel 32 in the vehicle width direction, and the flange portion 32C is joined to a surface 31C of the side body outer panel 31 facing the inside in the vehicle width direction. there is The flange portion 32C of the side body inner panel 32 and the side body outer panel 31 are preferably joined together using an adhesive A such as a mastic sealer.

A pillar inner lower panel 44 (and a pillar inner upper panel 42) is joined to the inner side of the bent portion 32B of the side body inner panel 32 in the vehicle width direction. As in the above-described embodiment, the pillar inner lower panel 44 extends toward the vehicle front side from the joint J1 with the flange portion 43B of the pillar outer lower panel 43, and then bends outward in the vehicle width direction. It extends outward in the vehicle width direction from the portion 44B to the bent portion 32B of the side body inner panel 32 . A flange portion 44G projecting forward of the vehicle is formed at the outer end portion of the pillar inner lower panel 44 in the vehicle width direction, and the flange portion 44G is joined to the side body inner panel 32 by spot welding or the like. Although not shown, the pillar inner upper panel 42 is also formed in the same shape as the pillar inner lower panel 44 described above.

In the first modification as described above, the side body inner panel 32 extends from the joint J2 with the pillar inner lower panel 44 (and the pillar inner upper panel 42) to the surface 31C facing the inner side of the side body outer panel 31 in the vehicle width direction. The portion located between the joined flange portion 32C corresponds to the extension portion 51. As shown in FIG. Therefore, in the backside pillar 13 in the first modified example, the rear part of the side body outer panel 31, the pillar outer upper panel 41 and the pillar outer lower panel 43, the pillar inner upper panel 42 and the pillar inner lower panel 44, and the side body inner panel 32 A closed cross-sectional structure C1 extending in the vertical direction of the vehicle is formed by the extending portion 51 of. With the backside pillar 13 in the first modified example as described above, it is possible to obtain the same effects as in the case of the above-described embodiment.

FIG. 9 is a cross-sectional view of the backside pillar 13 in the second modified example. This cross-sectional view also shows a state in which the back side pillar 13 of the second modification is cut along line BB in FIG. 3, as in the case of the first modification.

In the first modified example, the extending portion 51 formed of the side body inner panel 32 extends outward in the vehicle width direction and is joined to the surface 31C of the side body outer panel 31 facing the vehicle width direction inner side. On the other hand, in the second modified example, as shown in FIG. 9, the extending portion 52 formed by the side body inner panel 32 extends toward the rear side of the vehicle. A flange portion 32D formed at the rear end portion of the side body inner panel 32 is joined by spot welding or an adhesive to a surface 43C of the pillar outer lower panel 43 (and the pillar outer upper panel 41) facing the vehicle front side. ing.

In the back side pillar 13 in the second modification, the pillar outer upper panel 41 and the pillar outer lower panel 43, the pillar inner upper panel 42 and the pillar inner lower panel 44, and the extension portion 52 of the side body inner panel 32 , a closed cross-sectional structure C2 extending in the vertical direction of the vehicle is formed. According to such a closed cross-section structure C2, when the back side pillar 13 is torsionally deformed, it is possible to effectively reduce the amount of deflection of each panel that constitutes the front surface portion and the rear surface portion.

FIG. 10 is a cross-sectional view of the backside pillar 13 in the third modified example. This cross-sectional view also shows a state in which the back side pillar 13 of the third modification is cut along line BB in FIG. 3, as in the case of the first and second modifications.

In the second modified example, the extension portion 52 extending toward the vehicle rear side is configured by the side body inner panel 32 . On the other hand, in the third modification, as shown in FIG. 10, the extending portion 53 extending toward the vehicle rear side is composed of the pillar inner lower panel 44 (and the pillar inner upper panel 42).

Specifically, the pillar inner lower panel 44 (and the pillar inner upper panel 42) in the third modified example is bent toward the vehicle rear side at the joint J2 with the side body inner panel 32, and is bent toward the vehicle rear side from the bent portion 44H. It extends to the pillar outer lower panel 43 (the pillar outer upper panel 41). A flange portion 44I is formed at the rear end portion of the pillar inner lower panel 44 on the outside in the vehicle width direction, and the flange portion 44I is joined to the surface 43C of the pillar outer lower panel 43 facing the vehicle front side by spot welding or an adhesive. ing.

In the backside pillar 13 according to the third modification, the pillar outer upper panel 41 and the pillar outer lower panel 43, and the pillar inner upper panel 42 and the pillar inner lower panel 44 form a closed cross-sectional structure C2 extending in the vertical direction of the vehicle. It is With the closed cross-sectional structure C2 in such a third modification, it is possible to obtain the same effects as in the case of the second modification.

The embodiments of the present invention and modifications related thereto have been described above, but the present invention is not limited to the above-described embodiments and modifications, and various modifications and variations can be made based on the technical idea of the present invention. Change is possible. For example, in the above-described embodiment and modification, an example in which the quarter window opening 33 and the recessed portion 36 for the slide rail are formed in the rear portion of the side body outer panel 31 has been described. A concave-convex shape corresponding to, for example, may be formed in the rear portion of the side body outer panel 31 .

DESCRIPTION OF SYMBOLS 1... Back door opening 2... Roof panel part 3... Side body panel part 4... Roof side rail 5... Slide rail 6... Rear tire house panel 7... Rear floor panel part 8... Side member 11... Roof back cross member 12... Floor back Cross member 13 Back side pillar 13A Outer panel portion 13B Inner panel portion 14 Corner portion 31 Side body outer panel 32 Side body inner panel 33 Quarter window opening 34 Reinforcing member 35 Fuel filler port 36 Concave shape Part 41 Pillar outer upper panel 42 Pillar inner upper panel 43 Pillar outer lower panel 44 Pillar inner lower panel 44E Convex portion 44F Corner 50 to 53 Extension A Adhesive C1, C3 Closed cross-sectional structure J1, J2 ... Joints

Claims (5)

A back door opening is provided at the rear portion of the vehicle body, and the back door opening includes a roof back cross member positioned on the upper side of the vehicle and extending in the vehicle width direction, and a floor back positioned on the lower side of the vehicle and extending in the vehicle width direction. An annular structure is formed by connecting the cross member and the backside pillars located on both left and right sides and extending in the vertical direction of the vehicle,
The back side pillar has an outer panel portion extending in the vehicle vertical direction, and an inner panel portion disposed on the vehicle inner side of the outer panel portion and extending in the vehicle vertical direction. , in the vehicle body rear portion structure joined to the end portion along the vehicle vertical direction of the inner panel portion,
The inner panel portion includes a first inner panel member extending toward the vehicle inner side from the end portion of the outer panel portion, and a first inner panel member joined to the first inner panel member and spaced from the outer panel portion toward the vehicle inner side. a spaced second inner panel member;
The back side pillar has an extending portion extending outward from the vehicle from a joint portion of the first and second inner panel members and joined to the vehicle inner side surface of the outer panel portion. The closed cross-sectional structure is formed by one of the first and second inner panel members, and the outer panel portion and the inner panel portion including the extending portion form a closed cross-sectional structure extending in the vertical direction of the vehicle. Rear body structure. The extending portion extends outward in the vehicle width direction from a joint portion of the first and second inner panel members, and is joined to a surface of the outer panel portion facing the inner side in the vehicle width direction. The vehicle body rear portion structure according to claim 1. A corner portion of the back door opening located on the lower side of the vehicle is formed in an arc shape when viewed from the front of the vehicle,
The back side pillar is joined to a rear end portion of a reinforcing member arranged in a vehicle lower side portion of a quarter window opening provided on a vehicle rear side surface and extending in the vehicle front-rear direction,
The extending portion is joined to a surface of the outer panel portion facing the inner side in the vehicle width direction at least in a range extending from an upper end portion of an arc in the corner portion of the back door opening to the reinforcing member in the vertical direction of the vehicle. 3. The vehicle body rear structure according to claim 2, wherein: The outer panel portion has a recessed portion recessed inward in the vehicle width direction at a height corresponding to the upper end portion of the arc at the corner portion of the back door opening in the vehicle vertical direction,
4. The vehicle body rear structure according to claim 3, wherein a lower portion of the extending portion on the outer side in the vehicle width direction is joined to the concave portion of the outer panel portion. The extending portion has a convex portion projecting toward the front side of the vehicle at a vehicle lower side of a joint portion with the concave portion of the outer panel portion, and the convex portion and the concave portion of the outer panel portion. are placed in contact with the
The convex portion has a corner that protrudes inward in the vehicle width direction when viewed from the front of the vehicle, and is formed in a shape that expands vertically from the corner toward the outside in the vehicle width direction. The vehicle body rear part structure according to claim 4.

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