JP2013136315A - Structure of vehicle body rear part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure which efficiently disperses a load of torsion deformation of a vehicle body caused by rotation of a back door to the vehicle body.SOLUTION: A back door opening part of a circumferential structure is arranged on a vehicle body rear part 1. Both of right and left side parts of the back door opening part and erecting parts erecting from the parts are structured by pillar parts. Rear side members 9 having a hat shape in cross section are arranged on both of right and left sides of a rear floor. A lower part of the back door opening part is arranged in a position higher than the rear side members 9. The rear side member 9 is provided with a rear side member upper panel 10, which closes an opening on an upper par and is joined to flanges on both right and left sides. A vertical part 10b extending upward the vehicle is arranged on a rear end of the upper panel 10. A first closed cross section part S1 formed of a back inner panel 6a and a pillar outer lower panel 4b is arranged in the pillar part erecting from the lower part of the back door opening part. Lower side parts of the panels 6a, 4b and the vertical part 10b are joined in three-ply.

Description

  The present invention particularly relates to a structure of a rear part of a vehicle body of a hatchback type vehicle provided with a back door.

Among vehicles, there is a hatchback type automobile equipped with a back door, and a rear door opening portion of a revolving structure that is opened and closed by the back door is provided at the rear of the vehicle body of this type of vehicle.
Conventionally, as a method of ensuring the rigidity of the rear part of the vehicle body of such a vehicle, a high-rigidity part due to the closed cross section of the surrounding structure of the back door opening and the rear side member part of the rear floor of the vehicle body basic structure are connected and strengthened. (For example, refer to Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2006-218995 Japanese Utility Model Publication No. 3-12621

However, in the conventional structure of the rear part of the vehicle body described above, the high rigidity part of the circumferential structure of the back door opening is provided at a position higher than the rear side member part of the rear floor of the vehicle body basic structure. When the rear side member portion of the vehicle body basic structure is laid out in the vertical direction of the vehicle, a separate bracket is added as in Patent Document 1 described above, or a back door opening is formed as in Patent Document 2 described above. It is necessary to connect the high-rigidity part and the rear side member part by greatly extending the high-rigidity part of the surrounding structure toward the lower side of the vehicle. Therefore, in the conventional structure of the rear part of the vehicle body, not only an increase in weight and cost is caused, but also there is a possibility that the rigidity in the length direction is lowered due to the highly rigid part being vertically long.
Further, in the conventional structure of the rear part of the vehicle body, when the rear side member part and the closed cross-sectional part in the vehicle width direction of the rotating structure of the back door opening are connected using the reinforcing member, There was a problem that the directional load could not be efficiently transmitted to the rear side member.

  The present invention has been made in view of such a situation, and an object of the present invention is to reduce the load of torsional deformation of the vehicle body in which the rotating structure of the back door opening rotates on a plane perpendicular to the vehicle longitudinal axis. It can be efficiently distributed to the vehicle structure such as the rear floor, rear wheel house, etc. via the closed cross section of the pillar part, the upright part of the rear side member upper panel, and the rear side member. An object of the present invention is to provide a structure of a rear portion of a vehicle body that can be assembled and can secure the mounting rigidity of components.

  In order to solve the above-described problems of the prior art, the present invention provides a back door opening having a revolving structure at the rear of the vehicle body, and the left and right side portions of the back door opening in the vehicle width direction and the rising from the left and right side portions. The rear side member having a cross-sectional hat shape with an upper opening extending in the vehicle front-rear direction is provided on both the left and right sides of the rear floor, and the lower portion of the back door opening is provided at a position higher than the rear side member. In the structure of the rear part of the vehicle body, the rear side member is provided with a rear side member upper panel that closes the upper opening and is joined to the left and right flanges. The rear end of the rear side member upper panel extends above the vehicle. An existing upright part is provided, and the pillar part rising from the lower part of the back door opening is A first closed cross-section portion formed by a back panel and a pillar outer panel is provided, and the lower portion of the back panel and the pillar outer panel and the upright portion of the rear side member upper panel are joined together in three pieces. .

  In the present invention, a pillar inner panel is provided in which an upper part is joined to the pillar outer panel and a lower part is joined to the back panel, and a second closed cross section is formed by the pillar inner panel and the back panel. In addition, the second closed cross-section portion is provided at a position adjacent to the first closed cross-section portion.

  Furthermore, in the present invention, a reinforcing member that connects the upright portion of the rear side member upper panel and the pillar inner panel is provided, and the reinforcing member is joined to the pillar inner panel.

As described above, the structure of the rear part of the vehicle body according to the present invention is provided with a back door opening having a revolving structure at the rear part of the vehicle body, and the left and right side parts of the back door opening part in the vehicle width direction and the rising part rising from the left and right side parts. A rear side member having a hat-shaped cross section with an opening extending in the vehicle front-rear direction is provided on both the left and right sides of the rear floor, and the lower part of the back door opening is provided at a position higher than the rear side member. The rear side member is provided with a rear side member upper panel that closes the upper opening and is joined to the left and right flanges, and the rear side member upper panel has an upright extending at the rear end of the vehicle. The pillar portion rising from the lower portion of the back door opening is provided with a back panel and a pillar. Since the first closed cross-section portion constituted by the outer panel is provided, and the lower portion of the back panel and the pillar outer panel and the upright portion of the rear side member upper panel are joined together in three pieces, The load of the vehicle body torsional deformation, which is a deformation in which the rotating structure of the door opening rotates in a plane perpendicular to the vehicle longitudinal axis, and the bending deformation of the entire length of the vehicle body are applied to the closed cross section of the pillar portion and the rear side member upper panel. It is possible to efficiently disperse the vehicle body structure such as the rear floor and the rear wheel house inner panel via the upright part and the rear side member, and torsional deformation of the vehicle body can be reliably suppressed.
The reason for this is that, in a hatchback type vehicle or the like, in order to suppress the torsional deformation of the vehicle body, the load of the torsional deformation of the vehicle body is directly connected directly to the pillar portion that is the vertical structure of the back door opening. This is because it is desirable to distribute the load to the rigid rear side member. Further, the reason why the back door opening is supported in the vertical movement in the bending deformation along the entire length of the vehicle body is that the ratio of the rear side member contributing through the pillar portion is large.

Further, according to the structure of the rear part of the vehicle body of the present invention, it is not necessary to use a bolt fastening component attached later as in the conventional structure, and it is possible to assemble integrally by spot welding or the like in the vehicle body assembly process. Therefore, the assembly rigidity of the parts can be ensured and the productivity of the vehicle can be improved. Moreover, if only the rear side member upper panel is made thicker, it becomes possible to improve the rigidity of connection with the rear side member, back panel and pillar outer panel of the peripheral parts, so that the number of parts is small as described above. In addition, the necessary rigidity can be ensured with a minimum weight increase.
Further, the upright portion of the rear side member upper panel and the upward connection by the reinforcing member eliminates the need to provide the lower end of the pillar inner panel up to the height of the rear side member, improving the yield in the press working of the pillar inner panel. And simplification of the pressing process.

  In the present invention, a pillar inner panel is provided in which an upper part is joined to the pillar outer panel and a lower part is joined to the back panel, and a second closed cross section is formed by the pillar inner panel and the back panel. In addition, since the second closed cross-sectional portion is provided at a position adjacent to the first closed cross-sectional portion, the second closed cross-sectional portion is a vertical pillar portion closed cross-section of the circumferential structure of the back door opening. 2 and the first closed cross section which is a closed cross section in the vehicle width direction are adjacent to each other, and the upright portion of the rear side member upper panel is connected below the first closed cross section, thereby improving the connection rigidity of the parts. be able to. That is, in the structure of the present invention, not only the closed cross section of the revolving structure of the back door opening is provided continuously, but also the first and second corners of the back door opening that require connection rigidity. The closed cross section of the rear side member is adjacently disposed, and the upright portion of the rear side member upper panel is connected to this portion, so that the load distribution to the rear side member such as the torsional deformation load of the vehicle body is promoted. Can do.

  Furthermore, in the present invention, a reinforcing member that connects the upright portion of the rear side member upper panel and the pillar inner panel is provided, and the reinforcing member is joined to the pillar inner panel. The presence of the torsional deformation of the vehicle body can be easily transmitted to the rear side member, and the effects of the present invention can be further improved.

It is the perspective view which looked at the vehicle body rear part of the vehicle to which the structure which concerns on embodiment of this invention is applied from the vehicle diagonally forward. It is a perspective view which expands and shows the X section in FIG. FIG. 5 is a perspective view showing an arrangement relationship of components around an upright portion of a rear side member upper panel in a vehicle body rear portion to which a structure according to an embodiment of the present invention is applied. FIG. 3 is a partial cross-sectional perspective view showing the arrangement relationship of components around an upright portion of a rear side member upper panel in a vehicle body rear portion to which a structure according to an embodiment of the present invention is applied. (A) is the sectional view on the AA line of FIG. 4, (b) is the sectional view on the BB line of FIG. 1 is a plan view of a vehicle body rear portion to which a structure according to an embodiment of the present invention is applied, viewed from above a vehicle.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIGS. 1-6 shows the structure of the vehicle body rear part based on embodiment of this invention.

A vehicle to which the structure of the embodiment of the present invention is applied is a hatchback type automobile having a back door (not shown) as shown in FIGS. Is provided with a back door opening 2 having a revolving structure that is opened and closed by a back door (not shown). The left and right side portions of the back door opening 2 in the vehicle width direction and the rising portion in the vehicle vertical direction that rises upward from the left and right side portions are constituted by pillars 3. And the pillar part 3 is connected and arrange | positioned at the upper part of the L-shaped pillar lower panel 4 and this pillar lower panel 4 by the front view arrange | positioned in the lower side corner | angular part of the back door opening part 2, and follows a vehicle up-down direction. Each of the pillar lower panel 4 and the pillar upper panel 5 joins the inner pillar inner lower panel 4a and the outer pillar outer lower panel 4b to each other, and the inner pillar inner upper panel 5b. The panel 5a and an outer pillar outer upper panel (not shown) are joined to each other to form a closed cross-sectional shape.
Moreover, a back panel portion 6 joined to the inner end portion of the pillar lower panel 4 is disposed between the lower end portions of the pillar portion 3 along the vehicle width direction. The back panel portion 6 is configured by joining an inner back inner panel 6a and an outer back outer panel 6b to each other, and an upper portion of the back inner panel 6a is bent obliquely upward toward the rear of the vehicle. Yes. In addition, the arrow F direction in FIG. 1 has shown the vehicle front.

Further, as shown in FIGS. 1 to 4 and 6, a rear floor 7 extending in the vehicle front-rear direction and the vehicle width direction is provided at the lower portion of the vehicle body rear portion 1 of the present embodiment. The rear floor 7 is divided into a main rear floor panel 8 on the rear center floor and a side floor panel 12 on the rear side floor with a rear side member 9 in the vehicle width direction. The main rear floor panel 8 is disposed at an intermediate portion of the rear floor 7, and the side floor panels 12 are disposed at left and right side portions of the rear floor 7.
The rear side members 9 are disposed on both the left and right sides of the main rear floor panel 8, and the inner side portions are joined to the main rear floor panel 8, and the outer side portions on the rear side of the vehicle from the rear wheel house inner panel 21 disposed adjacent to each other. Are joined to the side rear floor panel 12. In addition, the rear side member 9 is provided along the main rear floor panel 8 while extending in the vehicle front-rear direction, and is formed in a hat-shaped cross section with an open top. For this reason, flanges 14 bent outward at a right angle are provided at the upper ends of the opposite left and right side walls of the rear side member 9. The lower portion of the back door opening 2 is provided at a position higher than the rear side member 9.

As shown in FIGS. 1 to 6, a rear side member upper panel 10 that closes the upper opening and is joined to the left and right flanges 14 is provided on the upper portion of the rear side member 9 of the present embodiment. For this reason, the rear side member upper panel 10 has a horizontal portion 10 a that is joined to the flange 14 while closing the upper opening of the rear side member 9. Further, the rear side member upper panel 10 is formed by bending it at a right angle, and is provided with an upright portion 10b extending from the horizontal portion 10a toward the upper side of the vehicle. The rear end side is formed in an L shape in a side view by the horizontal portion 10a and the upright portion 10b. The upright portion 10 b of the rear side member upper panel 10 is joined to the lower portion of the rotating structure of the back door opening 2.
Here, the upright portion 10b includes a lower bent portion at the center in the width direction and forms a convex portion on the indoor side. Thereby, the rigidity of a bending part can be improved. Moreover, since a space is formed between the back inner panel 6a, a hole such as a clamp hole used indoors can be set in the convex portion. Thereby, since it becomes possible to set a clamp attachment hole, without making a hole in the back inner panel 6a which is a partition with an external field, concerns, such as a water leak, can be avoided.
In the structure of this embodiment, the rear side member upper panel 10, the rear side member 9, and the main rear floor panel 8 or the side rear floor panel 12 are joined together at the flange 14 of the rear side member 9, and the rear side member The upper panel 10 is joined to the rear wheel house inner panel 21. For this reason, on the outer side of the rear side member upper panel 10, a joining flange 13 is provided along the vehicle front-rear direction so as to face the rear wheel house inner panel 21, and the rear wheel house inner of the rear side member upper panel 10 is provided. The panel 21 side is joined to the rear wheel house inner panel 21 through an upright joining flange 13. The rear wheel house inner panel 21 is provided on the outer side of the rear side member 9 and the rear side member upper panel 10 at a position ahead of the vehicle with respect to the side rear floor panel 12, and is formed in a spherical curved shape with high surface rigidity.

Furthermore, in the structure of the present embodiment, as shown in FIGS. 4 and 6, the upright portions 10b of the rear side member 9 and the rear side member upper panel 10, and the closed cross-sections of the pillar inner lower panel 4a and the pillar outer lower panel 4b (described later) 2 closed cross-section portions S2) are arranged so as to overlap in the vertical direction when viewed from the front of the vehicle. In addition, the width dimension L1 of the upright part 10b of the rear side member upper panel 10 is set to be equal to the width dimension L2 of the rear side member 9, and the junction point W1 between the upright part 10b and the pillar part 3 is: Located within the range of overlap. Therefore, the joint point W1 between the upright portion 10b of the rear side member upper panel 10 and the pillar outer lower panel 4b of the pillar portion 3 is arranged in the transmission path of the vertical load from the back door opening portion 2.
Further, in the structure of this embodiment, by setting the plate thickness of only the rear side member upper panel 10 to be thicker than the plate thicknesses of other peripheral components, it is possible to ensure the necessary connection rigidity with a minimum weight increase. It is possible.

  On the other hand, the pillar portion 3 rising from the lower portion of the back door opening 2 is configured by joining the upper and lower overlapping portions of the back inner panel 6a of the back panel portion 6 and the pillar outer lower panel 4b of the pillar lower panel 4 to each other. A first closed cross section S1 is provided. The first closed cross section S1 is a closed cross section in the vehicle width direction, and is formed in a square shape in a side view. Moreover, the lower part of the back inner panel 6a and the pillar outer lower panel 4b located below the first closed cross section S1 and the upper left and right side parts of the upright part 10b of the rear side member upper panel 10 are shown in FIGS. As shown in FIG. 5, the three sheets are joined together by spot welding W1 or the like.

  As shown in FIGS. 4 and 5, the pillar inner lower panel 4a of the pillar lower panel 4 of the present embodiment has an upper rear end that is bent obliquely upward toward the rear of the vehicle and is joined to the pillar outer lower panel 4b. A second lower end constituted by a pillar inner lower panel 4a and a back inner panel 6a in which a lower end portion extending toward the back surface is joined to the back inner panel 6a of the back panel portion 6 and upper and lower overlapping portions are joined to each other. A cross section S2 is formed. The second closed cross section S2 is a closed cross section of the pillar portion 3 in the longitudinal direction of the circumferential structure of the back door opening 2, and is formed in a square shape in a side view. The second closed cross section S2 is provided at a position above the first closed cross section S1 and adjacent to the first closed cross section S1.

Further, in the structure of the vehicle body rear portion 1 of the present embodiment, as shown in FIGS. 1, 2, 4 and 5, the upright portion 10b of the rear side member upper panel 10 and the pillar inner lower panel 4a of the pillar lower panel 4 are provided. Reinforcing members 11 to be communicated are provided along the vehicle vertical direction. For this reason, the reinforcing member 11 is formed by using a panel material having a width smaller than the width of the upright portion 10b of the rear side member upper panel 10, and is disposed so as to be located inside the joining portion of the upright portion 10b. Has been.
The left and right sides of the upper end of the reinforcing member 11 are joined to the lower end of the pillar inner lower panel 4a by spot welding W2 or the like. The left and right sides of the lower end portion of the reinforcing member 11 are joined to the upper end portion of the upright portion 10b of the rear side member upper panel 10 by spot welding W2 or the like. As a result, the member constituting the second closed cross-section portion S2 and the upright portion 10b of the rear side member upper panel 10 are connected via the reinforcing member 11, and the vertical load from the back door opening 2 is increased. Is easily transmitted to the rear side member upper panel 10 and the rear side member 9 via the reinforcing member 11. Further, by providing a work hole through which the spot welding gun is passed through the pillar outer lower panel 4b, the spot welding W2 is performed by combining the back inner panel 6a of the back panel portion 6 in addition to the reinforcing member 11 and the lower end portion of the pillar inner lower panel 4a. It is also possible to join with three pieces. Thereby, the effect that the efficiency of the transmission of the load via the reinforcing member 11 is improved can be obtained.

  Thus, in the structure of the vehicle body rear portion 1 according to the embodiment of the present invention, the left and right side portions in the vehicle width direction and the rising portion in the vehicle vertical direction in the back door opening 2 of the surrounding structure of the vehicle body rear portion 1 are the pillar portions 3. The rear side member 9 having a hat-shaped cross section extending in the vehicle front-rear direction is provided on both the left and right sides of the main rear floor panel 8, and the upper opening is closed on the rear side member 9 and joined to the flanges 14 on the left and right sides. A rear side member upper panel 10 is provided, and an upright portion 10b extending from the horizontal portion 10a to the vehicle upper side is provided at the rear end of the rear side member upper panel 10, and the pillar portion 3 rising from the lower portion of the back door opening 2 is A first closed cross section S1 constituted by the back inner panel 6a and the pillar outer lower panel 4b is provided. Since the back inner panel 6a, the lower portion of the pillar outer lower panel 4b, and the upright portion 10b of the rear side member upper panel 10 are joined together by spot welding W1, a load such as torsional deformation of the vehicle body is caused. The vertical load from the back door opening 2 is applied to the main rear floor panel 8 of the rear floor 7, the rear wheel house 21, etc. via the closed section of the pillar portion 3, the upright portion 10 b of the rear side member upper panel 10 and the rear side member 9. It becomes possible to efficiently disperse and absorb the vehicle body structure, and torsional deformation of the vehicle body can be reliably suppressed. Moreover, in the structure of the vehicle body rear portion 1 according to the present embodiment, the parts can be assembled integrally by spot welding or the like in the car body assembly process, so that the parts can be assembled more easily than the case where each part is bolted and attached later. Assembly rigidity can be increased, and vehicle productivity can be improved and costs can be reduced.

In the structure of the present embodiment, the pillar inner lower panel 4a and the back inner panel 6a to which the upper and lower overlapping portions are joined together form the second closed section S2, and the second closed section S2 and the first Is provided at a position adjacent to the closed cross section S1, and the upright portion 10b of the rear side member upper panel 10 is connected at a position below the second closed cross section S2 and the first closed cross section S1. It is possible to improve the connection of the components of the rear portion 1 and to distribute the vertical load from the back door opening 2 smoothly and efficiently to the rear side member 9 and the main rear floor panel 8.
Furthermore, in the structure of the present embodiment, a reinforcing member 11 that connects the upright portion 10b of the rear side member upper panel 10 and the pillar inner lower panel 4a is provided, and the upper end portion of the reinforcing member 11 is formed by the pillar inner lower panel 4a and the spot weld W2. Since the lower end portion of the reinforcing member 11 is joined to the upright portion 10b of the rear side member upper panel 10 by spot welding W, the vertical load from the back door opening 2 is applied to the rear side member 9 via the reinforcing member 11. It becomes easy to convey to.

In the structure of the present embodiment, the upright portion 10b of the rear side member 9 and the rear side member upper panel 10, and the closed cross section (second closed cross section S2) of the pillar inner lower panel 4a and the pillar outer lower panel 4b are the vehicle. Since they are arranged so as to overlap in the vertical direction when viewed from the front, the vertical load from the back door opening 2 is applied to the second closed cross-section portion S2 of the pillar portion 3, the upright portion 10b of the rear side member upper panel 10, and the rear side. The members 9 can be more efficiently distributed to the vehicle body structure such as the main rear floor panel 8 of the rear floor 7 and the rear wheel house 21 via the members 9.
Furthermore, in the structure of the present embodiment, the width dimension L1 of the upright portion 10b of the rear side member upper panel 10 is equal to the width dimension L2 of the rear side member 9, and the upright portion 10b and the pillar portion 3 Since the joining point W1 is located within the overlap range, it is possible to transmit the vertical load from the back door opening 2 to the rear side member 9 via the highly rigid joining portion. The load distribution can be promoted.

In the structure of the present embodiment, the rear side member upper panel 10, the rear side member 9, and the main rear floor panel 8 or the side rear floor panel 12 of the rear floor 7 divided into three with the rear side member 9 interposed in the vehicle width direction are arranged on the rear side. Since the three members are joined together at the flange 14 of the member 9 and the rear side member upper panel 10 is joined to the rear wheel house inner panel 21, the rear side member upper panel 10 surrounds the back door opening 2 and the rear side member. 9. The joining rigidity of the rear floor 7 including the rear wheel house inner panel 21 can be secured, and the external load from the rear of the vehicle can be dispersed in the structure of the vehicle body rear portion 1. That is, in the structure of the present embodiment, the load received by the rear bumper is transmitted to the vehicle body rear portion 1, in particular, the surrounding structure of the back panel portion 6 and the back door opening 2 by the bumper member suspension member, and the rear side member 9 and the rear floor 7. Therefore, the load can be smoothly transmitted to the rear side member 7 through the upright portion 10b of the rear side member upper panel 10 directly from the surrounding structure of the back door opening 2, and the rear side member upper panel 10 is mainly used. It can be efficiently distributed to the rear floor 7 and the rear wheel house inner panel 21.
In the structure of the present embodiment, a joining flange 13 is provided on the outer side portion of the rear side member upper panel 10 so as to face the rear wheel house inner panel 21 along the vehicle front-rear direction. Since the rear wheel house inner panel 21 side is joined to the rear wheel house inner panel 21 via the upright joining flange 13, an external load applied to the rear side member 9 from the rear of the vehicle is efficiently applied to the rear wheel house inner panel 21 having high surface rigidity. While being able to transmit, the moving load ahead of a vehicle can be absorbed effectively.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Car body rear part 2 Back door opening part 3 Pillar part 4 Pillar lower panel 4a Pillar inner lower panel 4b Pillar outer lower panel 5 Pillar upper panel 5a Pillar inner upper panel 6 Back panel part 6a Back inner panel 6b Back outer panel 7 Rear floor 8 Main rear floor panel (rear) Central floor)
9 Rear side member 10 Rear side member upper panel 10a Horizontal portion 10b Upright portion 11 Reinforcing member 12 Side rear floor panel (rear side floor)
13 Joint flange 14 Flange L1 Width dimension of the upright portion of the rear side member upper panel L2 Width dimension of the rear side member S1 First closed cross section S2 Second closed cross section

Claims (3)

A rear door opening with a revolving structure is provided at the rear of the vehicle body, and the left and right side parts of the back door opening part in the vehicle width direction and the rising parts rising from the left and right side parts are constituted by pillars, and the vehicle front-rear direction is provided on the left and right sides of the rear floor. In the structure of the rear part of the vehicle body provided with a rear side member having a hat-shaped cross section with an open upper part extending to the lower part of the back door opening at a position higher than the rear side member,
The rear side member is provided with a rear side member upper panel that closes the upper opening and is joined to the left and right flanges, and an upright portion that extends above the vehicle is provided at the rear end of the rear side member upper panel. And
The pillar portion rising from the lower portion of the back door opening is provided with a first closed cross-sectional portion constituted by a back panel and a pillar outer panel, and a lower portion of the back panel and the pillar outer panel and the rear side member. The upright portion of the upper panel is a structure of the rear portion of the vehicle body that is joined together by three pieces.   There is provided a pillar inner panel in which an upper part is joined to the pillar outer panel and a lower part is joined to the back panel, and a second closed cross section is formed by the pillar inner panel and the back panel, The structure of the rear portion of the vehicle body according to claim 1, wherein the second closed cross-section portion is provided at a position adjacent to the first closed cross-section portion.   The reinforcing member for connecting the upright portion of the rear side member upper panel and the pillar inner panel is provided, and the reinforcing member is joined to the pillar inner panel. The structure of the rear part of the car body.

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