JP2012218691A - Rear part structure for vehicle body - Google Patents

Abstract

An object of the present invention is to provide a vehicle body rear part structure that achieves both weight reduction and rigidity improvement of the vehicle body rear part.
A roof panel (102) having a hinge mounting seat surface (110) and a roof back inner member (112) extending in the vehicle width direction on the vehicle inner side of the roof panel (102) is disposed in a first closed cross section (114), and the roof is arranged. A roof back inner force 120 having a first seat surface 122 which is attached across the joint 118 between the back inner member 112 and the quarter inner member 116 and is in contact with the inside of the hinge mounting seat surface 110; Hinge reinforcement 132 having a rectangular wave-like second seating surface 134 disposed in a second closed cross-section 130 formed by the force 120 and the roof back inner member 112 and in contact with the inside of the first seating surface 122. And have.
[Selection] Figure 2

Description

  The present invention relates to a vehicle body rear structure having a hinge that rotatably supports a back door.

  Conventionally, a back door is rotatably attached to a rear part of a hatchback type vehicle body via a hinge having a rotation axis in the vehicle width direction. Since the load from the back door concentrates on this hinge, the hinge mounting portion that becomes the base of the hinge needs to have sufficient rigidity to withstand the concentrated load. For this reason, for example, Patent Document 1 discloses a technique in which the hinge mounting portion is constituted by three panel overlapping portions of a roof panel, a rear roof rail outer, and a hinge reinforcement.

  The rear roof rail outer is a plate-like member that is long in the vehicle width direction, and hinge mounting portions are provided on both the left and right sides of the rear roof rail outer (see FIGS. 2 and 5 of Patent Document 1). Further, the hinge reinforcement has a substantially annular lower overlapping portion around it, and has a convex portion (hinge receiving surface) protruding upward at the center (see FIG. 5 of Patent Document 1).

No. 2-332497

  However, the rear roof rail outer of Patent Document 1 is a plate-like member that is elongated in the vehicle width direction. For this reason, a load from the back door is applied to the rear roof rail outer via a hinge, so that it is necessary to increase the thickness of the central portion in accordance with both end portions in the vehicle width direction where rigidity is most required. As a result, the total weight of the rear roof rail outer including the central portion increases, and the material cost increases.

  Further, the hinge reinforcement of Patent Document 1 has a convex portion (hinge receiving surface) protruding upward in the center. To manufacture a component having such a shape, for example, deep drawing (depth Drawing). However, in deep drawing, the corners of the convex portion must be molded with a large curvature radius so that cracks and wrinkles do not occur in the drawn portion, and the shape must be gently protruding. Since a certain distance is required until the protruding convex portion becomes flat again, in order to fix the hinge reinforcement having such a shape to the vehicle body, a flat portion separated from the protruding convex portion by a distance. It had to be fixed at the location, and the layout was very limited.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a vehicle body rear structure that achieves both weight reduction and improved rigidity of the back door mounting portion or eliminates restrictions on the layout of the hinge mounting portion.

  In order to solve the above-described problems, a typical configuration of a vehicle body rear structure according to the present invention is a vehicle body rear structure having a hinge that rotatably supports a back door. A roof panel having a mounting seat surface, a roof back inner member extending in the vehicle width direction of the roof panel in the vehicle width direction to form the roof panel and the first closed cross section, and both sides of the roof back inner member in the vehicle width direction A quarter inner member that is joined and curved and extends below the vehicle body, and is disposed within the first closed cross section, and is attached to both the roof back inner member and the quarter inner member across the joined portion. A second formed by two first reinforcing members having a first seating surface in contact with the vehicle inner side of the seating surface, a first reinforcing member and a roof back inner member. Disposed closed plane, and having a second reinforcing member having a second bearing surface projecting from the periphery in contact with the interior side of the first seat surface.

  By dividing the first reinforcing member into two by the above configuration, the number of parts is increased, but the central portion in the longitudinal direction is deleted, so that the weight can be reduced. Conventionally, it has been necessary to increase the thickness of the central portion in accordance with both end portions where rigidity is most required, but this is a wasteful material cost. Moreover, since the first reinforcing member is an important part for improving the vehicle body rigidity of the back door opening, the plate thickness and the like can be freely set according to the required performance of the related parts. That is, according to the present invention, it is possible to achieve both weight reduction and improved rigidity of the back door mounting portion.

  Further, another typical configuration of the vehicle body rear structure according to the present invention is a vehicle body rear structure having a hinge that rotatably supports the back door. The hinge mounting seating surface that covers the upper part of the passenger compartment and to which the hinge is attached is provided. A roof panel having a roof panel, a roof back inner member extending in the vehicle width direction to form a first closed cross section and extending in the vehicle width direction of the roof panel, and curved and joined to both sides of the roof back inner member in the vehicle width direction. And a single first reinforcing member having a first seating surface disposed in the first closed cross section, extending in the vehicle width direction and contacting the hinge mounting seating surface from the vehicle interior side And a second seating surface that is disposed within a second closed cross section formed by the first reinforcing member and the roof back inner member, and that protrudes from the periphery in a rectangular wave shape that contacts the vehicle interior side of the first seating surface. Having second And having a reinforcing member.

  With the above configuration, the second seating surface of the second reinforcing member is protruded from the surroundings in a rectangular wave shape, and the bending angle is made to approach a right angle. Therefore, the hinge mounting portion is moved further outward in the vehicle width direction and the space between the hinges is increased. The distance (hinge pitch) can be increased. Thereby, the freedom degree of the layout of a hinge attaching part increases. Moreover, a back door (not shown) can be stably and firmly attached by a hinge having a wide hinge pitch.

  On the other hand, the coupling bolt that fastens the quarter inner member, the roof back inner member, and the second reinforcing member together can move inward in the vehicle width direction. For this reason, it is possible to increase the rigidity by increasing the bending radius of the quarter inner member that curves from the joint portion and extends downward from the vehicle body. When the hinge pitch is widened, the quarter radius of the quarter inner member usually becomes smaller. However, according to the present invention, the second seat surface protrudes in a shape almost similar to a rectangular wave. The shape as described above can be realized.

  In addition, since the second seating surface has a rectangular wave shape and the bending angle is made close to a right angle, the boundary between the hat-shaped collar portion and the protruding portion and the fastening position of the coupling bolt can be brought closer. For this reason, the rigidity of the second reinforcing member including the second seating surface can be increased.

  Moreover, since the second reinforcing member has a shape in which a part can be made by foam molding, it is easy to mold and the mold cost can be reduced.

  Further, another typical configuration of the vehicle body rear structure according to the present invention is a vehicle body rear structure having a hinge that rotatably supports the back door. The hinge mounting seating surface that covers the upper part of the passenger compartment and to which the hinge is attached is provided. A roof panel having a roof panel, a roof back inner member extending in the vehicle width direction to form a first closed cross section and extending in the vehicle width direction of the roof panel, and curved and joined to both sides of the roof back inner member in the vehicle width direction. A quarter inner member extending below the vehicle body, and mounted on both the roof back inner member and the quarter inner member across the joined portion that is disposed within the first closed cross-section, Arranged in a second closed cross section formed by two first reinforcing members having a first seating surface in contact with the inner side, the first reinforcing member and the roof back inner member. Is characterized as having a second reinforcing member having a second bearing surface projecting from around the rectangular wave which is in contact with the interior side of the first seat surface.

  With the above configuration, first, the first reinforcing member is divided into two parts, but the number of parts increases, but it is possible to achieve both weight reduction and rigidity improvement. Next, the above-described various effects are also obtained by making the second seating surface of the second reinforcing member protrude from the periphery in a rectangular wave shape and making the bending angle close to a right angle.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body rear part structure which makes the weight reduction of a vehicle body rear part and the rigidity improvement of a back door attachment part compatible, or eliminates the restrictions on the layout of a hinge attachment part can be provided.

It is the perspective view which looked at the vehicle to which the vehicle body rear part structure of this embodiment was applied from the left rear. It is the perspective view which abbreviate | omitted the display of the side body outer and the roof panel from FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is a perspective view which shows the modification of FIG. It is sectional drawing which follows the AA line of FIG. It is the elements on larger scale which omitted the roof back inner reinforcement from FIG. It is a B direction arrow sectional view of FIG. It is a figure explaining a comparative example and this embodiment by contrasting.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified.

  In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a perspective view of a vehicle to which the vehicle body rear structure of the present embodiment is applied as viewed from the left rear side, and displays only sheet metal parts. In FIG. 1, for example, in a hatchback type or wagon type vehicle 100, a back door (not shown) that opens and closes a rear opening of the vehicle 100 is supported so as to be pivotable up and down. In order to attach the back door, a pair of left and right hinges 106 (see FIG. 5) for attaching the back door are attached to the rear panel of the roof panel 102 and the side body outers 104 and 105 covering the upper part and the side of the compartment, respectively. It is fixed.

  Further, a flat portion 108 is formed at the rear end of the vehicle body of the roof panel 102 through a deep step below. Near the both ends of the flat portion 108 in the vehicle width direction, hinge mounting seat surfaces 110 and 111 to which the pair of hinges 106 are attached are disposed at a predetermined interval. The hinge mounting seat surfaces 110 and 111 are formed on the upper end surface of the protruding portion protruding upward from the flat portion 108 in a trapezoidal shape.

  FIG. 2 is a perspective view in which the display of the side body outer and the roof panel is omitted from FIG. As shown in FIG. 2, a roof back inner member (roof back inner member) 112 extending in the vehicle width direction on the vehicle inner side of the roof panel 102 is provided. The roof back inner member 112 includes a front end flange portion 112a, an inclined surface 112b inclined downward from the front end flange portion 112a through a low step, and a rear end flange portion 112c formed behind the inclined surface 112b. And have. The inclined surface 112b of the roof back inner member 112 is provided with a plurality of rectangular openings 112d for weight reduction. In the present embodiment, a single opening 112d is denoted by a symbol representing the plurality of openings.

  The roof panel 102 and the roof back inner member 112 form a first closed cross section 114 (see FIG. 5) in order to ensure necessary rigidity. Further, quarter inner members 116 and 117 are joined to both sides of the roof back inner member 112 in the vehicle width direction by welding or the like via joint portions 118 and 119, respectively. The joint portions 118 and 119 are abutting surfaces of the quarter inner member 116 (and 117) and the roof back inner member 112.

  The quarter inner member 116 on the left side of the vehicle body is formed by joining a quarter inner upper extension 116a and a quarter inner panel 116b extending in the vertical direction of the vehicle body. Similarly, the quarter inner member 117 on the right side of the vehicle body is formed by joining a quarter inner upper extension 117a and a quarter inner panel 117b extending in the vertical direction of the vehicle body. The quarter inner members 116 and 117 are curved from the joint portions 118 and 119 and extend downward in the vehicle body.

  As shown in FIGS. 2 and 3, two roof back inner reinforcements (first reinforcing members) having first seating surfaces 122 and 123 are disposed in the first closed section 114 (see FIG. 5). ) 120 and 121 are arranged. In order to distinguish from other members, the outlines of the roof back inner forces 120 and 121 are indicated by bold lines.

  The first seat surfaces 122 and 123 are provided so as to be in contact with the vehicle interior side of hinge mounting seat surfaces 110 and 111 (see FIG. 1) formed on the roof panel 102. The roof back inner reinforcements 120 and 121 are attached to both the joint portions 118 and 119 between the roof back inner member 112 and the quarter inner members 116 and 117 by spot welding.

  Since the roof back inner forces 120 and 121 are symmetric, only one (left side) roof back inner force 120 will be described below.

  FIG. 3 is a partially enlarged view of FIG. As shown in FIG. 3, the roof back inner reinforcement 120 has a substantially rectangular shape in plan view, and includes a front end flange portion 120a, a substantially flat front portion 120b following the front end flange portion 120a, and the front portion 120b. And a lower surface portion 120c extending rearward through a deep step. A projecting portion 126 projecting upward is provided at the approximate center in the vehicle width direction of the lower surface portion 120c. The above-described first seating surface 122 is formed at the upper end of the protruding portion 126.

  In addition, the roof back inner reinforcement 120 has a first extension portion 120 d that is inclined downward from the first seat surface 122. The first extension 120d is joined to a tongue piece 136 of a hinge reinforcement 132 described later. In addition, the rectangular opening parts 124 and 125 are provided in the front part 120b for weight reduction.

  The roof back inner reinforcement 120 has bolts 128 and spot welds (see FIG. 3) straddling the joint 118 between the roof back inner member 112 and the quarter inner member 116 in the vicinity of the left end of the roof back inner member 112 in the vehicle width direction. Etc.) and the like.

  The first seat surface 122 serves to reinforce the roof panel 102 from the vehicle inner side against a load applied to the hinge mounting seat surface 110 by contacting from the vehicle inner side.

  Thus, in this embodiment, the divided | segmented two roof back inner reinforcements 120 and 121 were provided. Thereby, although the number of parts increases compared with the case where it is set as a single member, since the center part of the longitudinal direction was deleted, weight reduction can be achieved. That is, conventionally, it has been necessary to increase the thickness of the central portion in accordance with both end portions where rigidity is most required, but this is a wasteful material cost.

  In addition, these two roof back inner reinforcements 120 (and 121) are important parts for improving the vehicle body rigidity of the back door opening, so that the plate thickness and the like can be freely adjusted according to the required performance of the related parts. Can be set. Further, since the roof back inner reinforcement 120 (and 121) is divided into two parts, there is an effect that adjustment at the time of attachment is easy. That is, according to the present embodiment, it is possible to achieve both weight reduction and improved rigidity of the back door mounting portion.

  FIG. 4 is a perspective view showing a modification of FIG. In the embodiment of FIG. 2, the case where separate roof back inner forces 120 and 121 are provided for weight reduction has been described. However, the present invention is not limited to this. For example, as shown in FIG. 4, the weight may be reduced by a single roof back inner force 170. In this case, the roof back inner force 170 is provided with a plurality of rectangular openings 170a and 170b for weight reduction. In the present embodiment, one opening 170a and 170b is assigned to each of the front and rear portions as a representative of the plurality of openings.

  FIG. 5 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 5 (and FIG. 2), a hinge reinforcement (second second) extending in the longitudinal direction of the vehicle body in a second closed cross-section 130 formed by the roof back inner reinforcement 120 and the roof back inner member 112. Reinforcing members) 132 and 133 are disposed. Since the hinge reinforcements 132 and 133 are symmetrical, only one hinge reinforcement 132 will be described below.

  In FIG. 5, the front end flange portion 120 a of the roof back inner reinforcement 120, the front end flange portion 132 a of the hinge reinforcement 132, and the front end flange portion 112 a of the roof back inner member 112 are attached to the roof panel 102 by the mastic sealer 150. Bonded and fixed.

  Further, the roof back inner member 112 has a work hole 112e used for spot welding at a position straddling the hinge mounting seat surface 110 and the tongue piece 136 (see FIG. 6) in plan view. The work hole 112e is used when spot welding the first extension 120d of the roof back inner reinforcement 120 and the tongue piece 136 of the hinge reinforcement 132.

  6 is a partially enlarged view in which the roof back inner force 120 is omitted from FIG. In order to distinguish from other members, the outline of the hinge reinforcement 132 is indicated by a bold line.

  As shown in FIG. 6, the hinge reinforcement 132 includes a front end flange portion 132a, a left flange portion 132b, and a right flange portion 132c that are formed continuously. Further, side wall portions 137 and 138 extending in the longitudinal direction of the vehicle body and projecting from the periphery in a rectangular wave shape are formed on the center sides of these flange portions. A second seat surface 134 is formed at the rear end of the upper end of the side wall portions 137 and 138 with a slight step.

  That is, the second seat surface 134 includes side wall portions 137 and 138 that protrude from the periphery in a rectangular wave shape. A concave portion 139 is formed at the center of the upper ends of the side wall portions 137 and 138. The concave portion 139 is a downward projection (bead) formed for the purpose of reinforcing rigidity.

  The second seat surface 134 is formed so as to be in contact with the vehicle interior side of the first seat surface 122 of the roof back inner reinforcement 120. Further, the second seat surface 134 has a function of reinforcing the roof panel 102 together with the first seat surface 122 from the inside of the vehicle against a load applied to the hinge mounting seat surface 110. In addition, the effect which formed the 2nd seat surface 134 in the rectangular wave form is demonstrated in the below-mentioned comparative example.

  On the rear end side of the second seat surface 134, a tongue piece 136 is formed extending downward and inclined toward the rear of the vehicle body. The tongue 136 is joined to the first extension 120d of the roof back inner reinforcement 120 by spot welding (see FIG. 5).

  Thus, the left flange portion 132b of the hinge reinforcement 132 is integrally fastened together with the quarter inner member 116 and the roof back inner member 112 in the vicinity of the left end portion of the roof back inner member 112 in the vehicle width direction. The joint bolts 140a and 140b are used for the fastening. In addition to this, spot welding (a plurality of x points in FIG. 6) or the like is used.

  7 is a cross-sectional view taken in the direction of arrow B in FIG. In FIG. 7, the hinge 106 is supported by the hinge mounting seat surface 110 of the roof panel 102, the first seat surface 122 of the roof back inner reinforcement 120, and the second seat surface 134 of the hinge reinforcement 132. ing. And it is fastened by the hinge mounting bolt 142 and the nut 144 which penetrate these seat surfaces 110,122,134. A washer 146 is provided between the hinge 106 and the hinge mounting seat surface 110.

(Comparative example)
Next, the comparative example and this embodiment will be described with reference to FIG. 8 is a cross-sectional view of the rear body structure of the comparative example as seen from the rear of the vehicle body, and the lower figure is a cross-sectional view of the rear body structure of the present embodiment as seen from the rear of the vehicle body.

  In the comparative example, a single roof back inner force 20 extends in the vehicle width direction. The first seat surfaces 22 and 23 of the roof back inner reinforcement 20 are in contact with the hinge mounting seat surfaces 10 and 11 of the roof panel 2 from the inside of the vehicle. On the other hand, in this embodiment, the roof back inner force 120, 121 divided into two parts is a joint 118 between the roof back inner member 112 extending in the vehicle width direction and the quarter inner members 116, 117 on the left and right end sides. 119, respectively.

  In the comparative example, a single roof back inner force 20 is connected in the vehicle width direction, and it is necessary to increase the thickness of the central portion in accordance with both end portions where rigidity is most required. For this reason, it becomes a useless material cost and a heavy weight. On the other hand, in this embodiment, the roof back inner force 120, 121 divided into two is used. For this reason, although the number of parts increases, it is possible to reduce cost and weight by omitting useless material in the central portion.

  In the comparative example, the second seating surfaces 34 and 35 formed on the hinge reinforcements 32 and 33 have a shape formed by drawing that protrudes from the periphery. For this reason, it is difficult to reduce the bending radius R of the protruding portion in consideration of the drawing molding conditions. As a result, the hinge mounting portions (10, 22, 34) (11, 23, 35) could not be arranged outside in the vehicle width direction. This is because the bending radius R of the hinge reinforcements 32 and 33 must be increased. For this reason, it is difficult to arrange the positions of the coupling bolts 40 and 41 on the inner side in the vehicle width direction. Thus, in the comparative example, the restrictions on the layout of the hinge mounting portion were severe.

  On the other hand, in the present embodiment, the second seating surfaces 134 and 135 formed on the hinge reinforcements 132 and 133 project from the periphery in a rectangular wave shape with substantially right corners, and can be pressed. That is, the bending radius r of the boundary portion between the flange portion and the protruding portion when the rectangular wave shape is regarded as a hat can be reduced. As a result, the hinge mounting portions (110, 122, 134) (111, 123, 135) can be moved by L1 outward in the vehicle width direction relative to the comparative example, and the left and right hinge pitches can be widened. Thus, the degree of freedom in layout of the hinge mounting portion is increased, and the back door (not shown) can be stably and firmly attached by the hinge having a wide hinge pitch.

  On the other hand, since the second seating surfaces 134 and 135 are formed in a rectangular wave shape and the bending angle is made close to a right angle, the quarter inner members 116 and 117, the roof back inner member 112, and the hinge reinforcements 132 and 133 are tightened together. The existing coupling bolts 140 and 141 can move by L2 inward in the vehicle width direction. For this reason, it is possible to increase the rigidity by increasing the bending radius ρ of the quarter inner members 116 and 117 that are curved from the joint fastening portion and extend downward from the vehicle body. When the hinge pitch is increased, the bending radius of the quarter inner members 116 and 117 usually becomes smaller. However, according to the present embodiment, the second seating surfaces 134 and 135 protrude in a shape almost similar to a rectangular wave. Thus, the shape as described above can be realized in which the quarter inner members 116 and 117 project to the inside of the vehicle.

  Accordingly, in the present embodiment, the bending radius ρ of the quarter inner members 116 and 117 can be increased to increase the rigidity. That is, when the quarter inner members 116 and 117 receive an external force, the quarter inner members 116 and 117 do not bend, and the force can be released to another place. Thus, the rigidity can be increased as compared with the conventional bent shape that is close to a right angle.

  In addition, since the second seating surfaces 134 and 135 project in a rectangular wave shape at a substantially right angle (the inclination angle is sharp), a fastening portion between the hat-shaped collar portion and the projecting portion and the coupling bolts 140 and 141 is fastened. Can be brought closer. Thereby, the rigidity of the hinge reinforcements 132 and 133 having the second seating surfaces 134 and 135 can be increased. Further, since the second seating surfaces 134 and 135 are formed in a hat shape close to a right angle, the hinge reinforcements 132 and 133 can be further miniaturized.

  Further, since the hinge reinforcements 132 and 133 are important parts for increasing the rigidity of the hinge mounting portion, the plate thickness and the like can be freely set in accordance with the required performance from each part. Further, since the second reinforcing members 132 and 133 can be manufactured by foam molding, it is easy to mold and the mold cost can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a vehicle body rear structure having a hinge that rotatably supports a back door.

DESCRIPTION OF SYMBOLS 100 ... Vehicle, 102 ... Roof panel, 104, 105 ... Side body outer, 106 ... Hinge, 110, 111 ... Hinge mounting seat surface, 112 ... Roof back inner member (roof back inner member), 112a ... Front end flange part, 112b ... inclined surface, 112c ... rear end flange, 112d ... opening, 112e ... working hole, 114 ... first closed section, 116, 117 ... quarter inner member, 118, 119 ... joint, 120, 121, 170 ... Roof back inner reinforcement (first reinforcing member), 120a ... front end flange portion, 120b ... front surface portion, 120c ... lower surface portion, 120d ... first extension portion, 122, 123 ... first seat surface, 124, 125 ... Opening part, 126 ... Protruding part, 128 ... Bolt, 130 ... Second closed section, 132, 133 ... Hinge reinforcement (Second reinforcing member), 132a ... front end flange portion, 132b ... left flange portion, 132c ... right flange portion, 134, 135 ... second seat surface, 136 ... tongue piece, 137, 138 ... side wall portion, 139 ... Recessed part, 140a, 140b ... coupling bolt, 141a, 141b ... coupling bolt, 142 ... hinge mounting bolt, 144 ... nut, 146 ... washer, 150 ... mastic sealer

Claims (3)

In the rear structure of the vehicle body having a hinge that rotatably supports the back door,
A roof panel that covers the upper part of the passenger compartment and has a hinge mounting seat surface to which the hinge is mounted;
A roof back inner member extending in the vehicle width direction of the roof panel to form a first closed cross section with the roof panel;
A quarter inner member which is joined to both sides of the roof back inner member in the vehicle width direction and which is curved and extends below the vehicle body;
The first closed surface disposed within the first closed cross section, attached to both the roof back inner member and the quarter inner member across the joined portion, and in contact with the inside of the hinge mounting seat surface. Two first reinforcing members having a seating surface of
A second seating surface is disposed within a second closed cross section formed by the first reinforcing member and the roof back inner member, and has a second seating surface protruding from the periphery in contact with the vehicle inner side of the first seating surface. The vehicle body rear part structure characterized by having 2 reinforcement members. In the rear structure of the vehicle body having a hinge that rotatably supports the back door,
A roof panel that covers the upper part of the passenger compartment and has a hinge mounting seat surface to which the hinge is mounted;
A roof back inner member extending in the vehicle width direction of the roof panel to form a first closed cross section with the roof panel;
A quarter inner member which is joined to both sides of the roof back inner member in the vehicle width direction and which is curved and extends below the vehicle body;
A single first reinforcing member disposed in the first closed cross section, extending in the vehicle width direction, and having a first seating surface in contact with the hinge mounting seating surface from the inside of the vehicle;
A second seating surface which is disposed within a second closed cross section formed by the first reinforcing member and the roof back inner member, and protrudes from the periphery in a rectangular wave shape in contact with the vehicle inner side of the first seating surface. And a second reinforcing member having a vehicle body rear structure. In the rear structure of the vehicle body having a hinge that rotatably supports the back door,
A roof panel that covers the upper part of the passenger compartment and has a hinge mounting seat surface to which the hinge is mounted;
A roof back inner member extending in the vehicle width direction of the roof panel to form a first closed cross section with the roof panel;
A quarter inner member which is joined to both sides of the roof back inner member in the vehicle width direction and which is curved and extends below the vehicle body;
The first closed surface disposed within the first closed cross section, attached to both the roof back inner member and the quarter inner member across the joined portion, and in contact with the inside of the hinge mounting seat surface. Two first reinforcing members having a seating surface of
A second seating surface which is disposed within a second closed cross section formed by the first reinforcing member and the roof back inner member, and protrudes from the periphery in a rectangular wave shape in contact with the vehicle inner side of the first seating surface. And a second reinforcing member having a vehicle body rear structure.

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