JP6040645B2 - Vehicle side body structure - Google Patents

Description

  The present invention relates to a side body structure of a vehicle provided with a load transmission member for transmitting an impact load input from a vehicle side to a rear door to a rear side frame, and belongs to the technical field of the vehicle body structure of the vehicle.

  Patent Document 1 discloses a configuration in which a load transmission member extending inward in the vehicle width direction from a rear edge of a rear door opening is fixed on a floor panel. According to this configuration, when an impact load is input to the rear door from the side of the vehicle, the impact bar of the rear door is received from the inner side in the vehicle width direction by the load transmission member, so that the load transmission member passes through the floor panel. The impact load is transmitted to each part of the vehicle body.

  When the load transmitting member is used to transmit the impact load from the side of the vehicle as described above, the impact load is transmitted from the load transmitting member to the rear side frame disposed below the load transmitting member with the floor panel interposed therebetween. By doing so, it is possible to effectively disperse the impact load to the opposite side in the vehicle width direction through the cross member connected to the rear side frame. Therefore, the approach of the rear door into the vehicle interior is effectively suppressed, and the occupant can be protected.

JP 2008-24236 A

  However, the inventor of the present application, when the impact load from the side of the vehicle is transmitted from the load transmission member to the rear side frame as described above, the force in the direction of falling inward in the vehicle width direction acts on the load transmission member. It has been found that when this force is applied to the rear side frame, the cross-sectional shape of the rear side frame tends to collapse. When such a cross-sectional deformation occurs, the load transmission function of the rear side frame is impaired, so that the load distribution as described above cannot be effectively realized, and the amount of the rear door entering the vehicle interior is not necessarily sufficiently reduced. become unable.

  Therefore, the present invention effectively disperses the impact load from the load transmission member through the rear side frame when the impact load is input to the rear door from the side of the vehicle, thereby effectively allowing the rear door to enter the vehicle interior. It is a problem to suppress.

  In order to solve the above problems, the present invention is configured as follows.

First, a side body structure of a vehicle according to the invention described in claim 1 of the present application is:
A side panel that forms the side of the vehicle body behind the rear door opening;
A floor panel disposed between a pair of left and right side panels;
A load transmission member disposed on the inner side in the vehicle width direction of the side panel and having a plate-like rising surface portion rising from a lower end flange portion fixed to the upper surface of the floor panel ; and a facing surface portion facing the side panel;
A rear side frame that is disposed along the lower surface of the floor panel and forms a closed cross-sectional portion that continues in the vehicle front-rear direction so as to pass under the load transmitting member,
In the load transmitting member, among the portions that connect the opposed surface portion to the closed cross-section portion via the lower flange portion, the portion that connects the upper end portion to the lower end portion of the opposed surface portion to the closed cross-section portion is Only one of the rising surface portions,
In the closed cross section, a bulkhead joined to the inner surface of the rear side frame is disposed,
The bulkhead and the load transmission member are arranged so that positions in the vehicle front-rear direction overlap each other.

The invention according to claim 2 is the invention according to claim 1,
At the upper end of the bulkhead, an upper end flange portion that comes into contact with the lower surface of the floor panel is provided,
The lower end flange part and the upper end flange part are fastened together by a fastening member at one or a plurality of fastening parts in a state where they are overlapped with each other across the floor panel.

Further, the invention according to claim 3 is the invention according to claim 1 or 2,
The bulkhead is formed with a bead extending downward from a lower vicinity of the fastening portion located on the innermost side in the vehicle width direction among the fastening portions.

  Here, when the number of the fastening portions is one, the one fastening portion is “a fastening portion positioned at the innermost side in the vehicle width direction”.

Furthermore, the invention according to claim 4 is the invention according to any one of claims 1 to 3,
A rear wheel house portion that bulges inward in the vehicle width direction is formed on the side panel,
The load transmission member has a shape with a width in the vehicle front-rear direction shorter than a width in the vertical direction, and is fixed to the front portion of the rear wheel house part directly or via a bracket.

  According to the first aspect of the present invention, the load transmission member is disposed on the floor panel on the inner side in the vehicle width direction of the side panel constituting the side surface of the vehicle body behind the rear door opening. A bulkhead is disposed in a closed cross-section portion of the rear side frame that passes below, and the bulkhead and the load transmission member are disposed such that their positions in the vehicle front-rear direction overlap each other. Therefore, when an impact load from the side of the vehicle is input to the load transmission member via the rear door, the bulkhead effectively breaks the cross-sectional shape of the rear side frame at the load transmission portion from the load transmission member to the rear side frame. Can be suppressed. Thereby, it is possible to satisfactorily realize load transmission in the rear side frame, and further, load transmission from the rear side frame to the opposite side in the vehicle width direction via the cross member. Therefore, it is possible to effectively disperse the impact load input to the rear door from the side of the vehicle in each part of the vehicle body, thereby effectively suppressing the rear door from entering the vehicle interior.

  According to the invention described in claim 2, the lower end flange portion of the load transmission member and the upper end flange portion of the bulkhead are fastened at one or more fastening portions in a state where they are overlapped with each other with the floor panel interposed therebetween. Since they are fastened together by the member, the impact load can be smoothly transmitted from the load transmitting member to the rear side frame via the fastening member and the bulkhead. Therefore, when an impact load is input from the side of the vehicle to the rear door, load distribution using the rear side frame can be more effectively realized.

  According to a third aspect of the present invention, the bead extending downward from the lower vicinity of the fastening portion located on the innermost side in the vehicle width direction among the fastening portions of the load transmitting member and the floor panel is provided on the bulkhead. Is formed. When the impact load from the side of the vehicle is transmitted from the load transmission member to the floor panel, the fastening portion located on the innermost side in the vehicle width direction among the fastening portions of the load transmission member and the floor panel is around the fastening portion. By generating a moment in the direction of rotating the load transmitting member so that it tilts inward in the vehicle width direction, the downward load tends to concentrate, but this downward load is formed on the bulkhead as described above. Further, it can be smoothly transmitted downward through the bead. Therefore, load transmission from the load transmission member to the rear side frame can be realized more satisfactorily.

  Furthermore, according to the invention described in claim 4, since the load transmitting member has a shape with a width in the vehicle front-rear direction shorter than the width in the vertical direction, the rear edge of the door opening and the rear wheel house portion The load transmitting member can be disposed in a narrow space in the vehicle front-rear direction between the front edge of the vehicle. Therefore, it is possible to prevent the load transmitting member from protruding into the rear door opening without reducing the rear door opening, thereby maintaining good boarding / alighting performance at the rear seat. The load transmitting member is fixed to the front part of the rear wheel house part directly or via a bracket, so that the side load is input while the width in the vehicle front-rear direction is short as described above. When this is done, the vehicle is prevented from falling in the longitudinal direction, and the load transmission function to the rear side frame can be satisfactorily exhibited.

It is a top view which shows the floor part of the vehicle provided with the side part vehicle body structure which concerns on one Embodiment of this invention. It is the perspective view which looked at the gusset for load transmission attached to the floor part shown in FIG. 1, and its peripheral part from the diagonally forward side of a vehicle interior. It is a top view which shows the gusset shown in FIG. 2, and its peripheral part. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a perspective view which shows the gusset shown in FIG. 2, and the bracket for the attachment. It is a perspective view which shows the bulkhead arrange | positioned in the closed cross-section part of the rear side frame which passes under the gusset shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, terms indicating directions such as “front”, “rear”, “front / rear”, “right”, “left”, “left / right”, etc. It shall indicate the direction when the traveling direction is “front”.

  FIG. 1 is a plan view showing a floor portion of a vehicle 1 having a side body structure according to the present embodiment. As shown in FIG. 1, the floor portion of the vehicle 1 includes a floor panel 4. A tunnel rain 3 extending in the front-rear direction from the dash panel (not shown) to the floor portion of the rear seat is provided at the center in the vehicle width direction of the floor panel 4, and a spare tire pan 5 is provided at the rear of the floor panel 4. It has been.

  Side sills 10 extending in the front-rear direction are provided on the left and right sides of the floor panel 4. A rear wheel house portion 34 that houses a rear wheel is provided behind the side sill 10, and a pair of left and right rear side frames 12 that extend in the front-rear direction through the inner side of the rear wheel house portion 34 in the vehicle width direction are provided on the floor panel 4. It is arranged along the lower surface.

  On the floor panel 4, a plurality of cross members 20, 22, 24, 26 extending in the vehicle width direction are arranged. Specifically, in order from the front side, No. 1 installed between the left and right side sills 10 and the tunnel rain 3. 2 Cross member 20 and No. 2 2.5 cross member 22 and No. 2 installed between the left and right side sills 10 on the rear side of the tunnel rain 3. No. 3 cross member 24 and No. 3 installed between the left and right rear wheel house portions 34. A four cross member 26 is provided.

  A load transmitting gusset 50 is disposed on the rear side of the rear door 16 in the vehicle width direction, and the gusset 50 is fixed to the upper surface of the floor panel 4. Thus, when an impact load from the side of the vehicle is input to the rear door 16, the impact load is received by the gusset 50 from the inside in the vehicle width direction, and the impact load is transmitted from the gusset 50 to the floor panel 4. It has become. Further, this impact load is transmitted to the rear side frame 12 passing under the gusset 50, and further, from the rear side frame 12 to No. 3 cross member 24 and No. 3 It is also transmitted to the other rear side frame 12 through the four cross member 26. Therefore, the impact load input to the rear door 16 from the side of the vehicle can be effectively distributed to each part of the vehicle body including the vehicle body part on the opposite side in the vehicle width direction, thereby allowing the rear door 16 to enter the vehicle interior. It can be effectively suppressed.

  The gusset 50 and its peripheral structure will be described with reference to FIGS.

  FIG. 2 is a perspective view of the gusset 50 on the right side of the vehicle and the periphery thereof as viewed obliquely from the vehicle interior side. 3 is a plan view showing the gusset 50 on the right side of the vehicle and its peripheral portion, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG. 6 is a perspective view showing the gusset 50 on the right side of the vehicle and a bracket 70 for mounting the gusset 50, and FIG. 7 is a perspective view showing the bulkhead 90 disposed in the closed cross section of the rear side frame 12 on the right side of the vehicle. FIG.

  2 to 7 show only the structure of the gusset 50 arranged on the right side of the vehicle and its peripheral part, and the structure on the left side of the vehicle is not shown. It is symmetrical compared to the right one.

  As shown in FIG. 2, side panels 32 constituting the vehicle body side behind the rear door opening 30 are provided on the left and right sides of the rear portion of the vehicle 1, and the floor panel 4 is interposed between the pair of left and right side panels 32. It is arranged. The rear wheel house portion 34 is formed on the side panel 32 so as to bulge in the vehicle width direction.

  The side panel 32 is formed so as to continue to the rear of the side sill 10, and forms a rear door opening 30 together with the side sill 10, the center pillar 14 (see FIG. 1), and a roof rail (not shown). Specifically, the rear edge portion of the rear door opening 30 is constituted by the opening forming portion 35 provided at the front edge portion of the side panel 32. A weather strip (not shown) is attached to the opening forming portion 35.

  As shown in FIG. 4, the side panel 32 includes a side panel outer 36 that constitutes a vehicle exterior side surface on the side of the vehicle body, and a rear wheel house outer (not shown) joined to each other so as to constitute a rear wheel house portion 34. ) And a rear wheel house inner 38.

  Further, the side sill 10 is closed in the closed cross section formed by the side sill outer 40 and the side sill inner 41 and the side sill outer 40 and the side sill inner 41 which are joined to each other so as to form a closed cross section continuous in the front-rear direction. And a side sill rain 42 arranged so as to partition the cross-section part to the left and right.

  Further, the rear side frame 12 includes a rear side frame member 28 having a reverse hat shape in cross section extending in the front-rear direction. The rear side frame member 28 is joined to the side surface in the vehicle width direction of the side sill inner 41 and the lower surface of the floor panel 4, and the rear side frame 12 is closed by the rear side frame member 28, the side sill inner 41, and the floor panel 4. A cross section is formed. The closed cross section of the rear side frame 12 is formed continuously in the front-rear direction so as to pass below the gusset 50. In addition, an inverted saddle-shaped bulging portion 29 for avoiding interference with the suspension support member is formed on the lower surface of the rear side frame member 28.

  As shown in FIGS. 2 to 5, the gusset 50 is disposed inside the opening forming portion 35 of the side panel 32 in the vehicle width direction. A rear seat (not shown) is disposed adjacent to the inside of the gusset 50 in the vehicle width direction, and a wheel house trim (not shown) is disposed between the rear seat and the side panel 32. The wheel house trim is disposed so as to cover the gusset 50 so that the gusset 50 is not exposed.

  The shape of the gusset 50 will be described with reference to FIG.

  The gusset 50 has a rising surface portion 52 that rises from the floor panel 4. The rising surface portion 52 is disposed substantially parallel to the vehicle width direction and along a substantially vertical direction when the vehicle is viewed from the side (see FIG. 5). The vehicle width direction inner edge portion of the rising surface portion 52 has a contour inclined downward inward in the vehicle width direction when viewed from the front. Further, the vehicle width direction outer edge portion of the rising surface portion 52 has a contour bent in an inverted V shape so that the middle portion in the vertical direction protrudes outward in the vehicle width direction when viewed from the front. Of the upper and lower inclined parts constituting the contour of the outer edge in the vehicle width direction, the lower inclined part is inclined downward toward the inner side in the vehicle width direction, and the inclination angle of the lower inclined part is The angle is gentler than the inclination of the contour of the inner edge of the rising surface 52 in the vehicle width direction.

  Further, for example, a pair of upper and lower bolt insertion holes 61 and 62 are provided in the rising surface portion 52, and the gusset 50 is fixed to the bracket 70 by bolts 83 and 84 inserted into the bolt insertion holes 61 and 62. It has become. These bolt insertion holes 61 and 62 are disposed above the center portion in the vertical direction of the rising surface portion 52.

  A lower end flange portion 53 that is placed on the upper surface of the floor panel 4 is provided at the lower end of the gusset 50. The lower end flange portion 53 has an elongated shape in the vehicle width direction, and the lower edge portion of the rising surface portion 52 is connected to the rear edge portion of the lower end flange portion 53. The lower end flange portion 53 is provided so as to extend inward from the inner end portion of the rising surface portion 52 in the vehicle width direction.

  For example, a pair of left and right bolt insertion holes 63 and 64 are provided in the lower end flange portion 53, and the gusset 50 is connected to the floor panel 4 by the bolts 102 and 103 (see FIG. 4) inserted into the bolt insertion holes 63 and 64. It is supposed to be fixed to. The bolt insertion holes 63 and 64 are provided at the substantially center portion and the inner side portion of the lower end flange portion 53 in the vehicle width direction.

  An opposing surface portion 54 that faces a portion between the rear edge portion of the rear door opening 30 and the rear wheel house portion 34 in the side panel 32 is provided at the outer end portion of the gusset 50 in the vehicle width direction. Specifically, the facing surface portion 54 is disposed to face the opening forming portion 35 of the side panel 32 (see FIG. 4). The facing surface portion 54 has an elongated shape in the vertical direction, and the rear edge portion of the facing surface portion 54 is continuous with the outer edge portion of the rising surface portion 52 in the vehicle width direction. With respect to the front-rear direction, the width of the facing surface portion 54 is substantially the same as the width of the lower end flange portion 53.

  The lower end portion of the facing surface portion 54 is disposed on the outer side in the vehicle width direction and above the lower end flange portion 53, and the lower end portion of the facing surface portion 54 and the outer end portion in the vehicle width direction of the lower end flange portion 53 are It connects via the inclined surface part 55 extended diagonally upward toward the width direction outer side. The inclined surface portion 55 has an elongated shape in the inclination direction. Regarding the front-rear direction, the width of the inclined surface portion 55 is substantially the same as the width of the lower end flange portion 53 and the facing surface portion 54.

  Further, the gusset 50 is provided with a front surface portion 56 that faces the front surface of the rising surface portion 52. The front surface portion 56 is formed so as to rise from the front edge portions of the lower end flange portion 53 and the inclined surface portion 55. The upper edge of the front portion 56 has a contour inclined downward inward in the vehicle width direction when viewed from the front. Further, the upper edge of the front surface portion 56 is formed lower than the bolt insertion holes 61 and 62 of the rising surface portion 52 so that the operation of fastening the bolts 83 and 84 from the front is not hindered by the front surface portion 56. Yes.

  As shown in FIG. 4, the gusset 50 configured as described above is disposed at a position where it can receive an impact load input to the rear door 16 from the side of the vehicle, and is fixed on the floor panel 4. In this attached state, the facing surface portion 54 of the gusset 50 is disposed substantially parallel to the opening forming portion 35 of the side panel 32 with a space therebetween. In the space between the facing surface portion 54 and the opening forming portion 35, the weather strip, the harness, and the like are disposed.

  Further, the rear portion of the impact bar 17 of the rear door 16 is disposed outside the facing surface portion 54 in the vehicle width direction. The facing surface portion 54 and the impact bar 17 are arranged in the front-rear direction and the vertical direction. It arrange | positions so that a position may overlap. Therefore, when an impact load is input to the rear door 16 from the side of the vehicle, the impact bar 17 of the rear door 16 is received by the facing surface portion 54 of the gusset 50 from the inner side in the vehicle width direction through the opening forming portion 35 of the side panel 32. As a result, the load transmission from the rear door 16 to the gusset 50 is satisfactorily realized, and this load is further transmitted to the floor panel 4 and the rear side frame 12.

  Furthermore, the gusset 50 configured as described above has a shape in which the width in the front-rear direction is shorter than the width in the vertical direction (see FIG. 5). Moreover, the width | variety of the front-back direction of the gusset 50 is shorter than the width | variety of a vehicle width direction (refer FIG. 3). Thus, since the gusset 50 has a flat shape with a small thickness in the front-rear direction, the front and rear of the vehicle between the rear edge of the rear door opening 30 and the front edge of the rear wheel house 34 are shown in FIG. The gusset 50 can be easily disposed in a space narrow in the direction. Therefore, it is possible to prevent the gusset 50 from protruding into the rear door opening 30 without reducing the rear door opening 30, thereby favorably maintaining the ease of getting on and off the rear seat.

  On the other hand, since the gusset 50 has a shape with a small thickness in the front-rear direction as described above, there arises a problem that the gusset 50 tends to fall forward or backward when receiving an impact load.

  Therefore, in the present embodiment, as shown in FIG. 5, the gusset 50 is fixed to the front portion of the rear wheel house portion 34 via the bracket 70. As a result, the gusset 50 is prevented from falling in the front-rear direction (in the direction of arrow D in FIG. 5) when a lateral load is input, while having a flat shape with a short width in the front-rear direction as described above. . In addition, since the rising surface portion 52 of the gusset 50 is disposed along a substantially vertical direction when viewed from the side of the vehicle, the rising surface portion 52 is inclined in the front-rear direction as compared with the case where the rising surface portion 52 is inclined forward or backward. The gusset 50 can be prevented from falling down more reliably. Further, since the rising surface portion 52 of the gusset 50 is disposed along the substantially vertical direction in the side view of the vehicle, the gusset 50 is viewed in the side view as compared with the case where the rising surface portion 52 is inclined forward. Of the impact bar 17 of the rear door 16 and the gusset 50 with respect to the position in the front-rear direction as compared with the case where the rising surface portion 52 is inclined rearward. It becomes easy to secure the amount of lap.

  The shape of the bracket 70 will be described with reference to FIG. 6 again.

  The bracket 70 has a box-like overall shape opened rearward. Specifically, the bracket 70 includes a front surface portion 72 to which the gusset 50 is fixed, and a plurality of side surface portions 73, 74, 75, 76 (73 to 76) extending rearward from the front surface portion 72.

  The front portion 72 of the bracket 70 is, for example, rectangular. For example, a pair of upper and lower bolt insertion holes 81, 82 are provided in the front surface portion 72, and the bolts 83, 84 are inserted into the respective bolt insertion holes 81, 82. Further, nuts 85 and 86 (see FIG. 5) for fastening the bolts 83 and 84 are welded to the rear surfaces of the front portions 81 and 82. Thereby, as shown in FIG. 5, the rising surface portion 52 of the gusset 50 is fixed to the front surface portion 72 of the bracket 70 by fastening the bolts 83 and 84 and the nuts 85 and 86 in the pair of upper and lower fastening portions T1 and T2. It has become. Of these fastening portions T1, T2, the upper fastening portion T1 is disposed slightly inward in the vehicle width direction with respect to the lower fastening portion T2.

  The side surface portions 73 to 76 of the bracket 70 include an upper side surface portion 73 extending rearward from the upper edge of the front surface portion 72, an outer side surface portion 74 extending rearward from the vehicle width direction outer edge portion of the front surface portion 72, and the front surface portion 72. The lower side surface portion 75 extends rearward from the lower edge, and the inner side surface portion 76 extends rearward from the inner edge portion of the front surface portion 72 in the vehicle width direction. Flange portions 77, 78, 79, and 80 (77 to 80) are provided at the rear ends of the side surface portions 73 to 76. These flange portions 77 to 80 are, for example, welded to the front of the rear wheel house portion 34. It is designed to be fixed to the part.

  By the way, when an impact load is transmitted from the gusset 50 to the rear side frame 12, if the closed cross section of the rear side frame 12 is significantly deformed, stress concentrates on the deformed portion and the load transmission function of the rear side frame 12 is impaired. .

  Therefore, in this embodiment, as shown in FIGS. 2 to 5, a bulkhead 90 joined to the inner surface of the rear side frame 12 is disposed in the closed cross section of the rear side frame 12. Further, the bulkhead 90 and the gusset 50 are arranged so that the positions in the front-rear direction overlap each other. Therefore, when an impact load from the side of the vehicle is input to the gusset 50 via the rear door 16, the bulkhead 90 effectively causes the cross-sectional shape of the rear side frame 12 to be collapsed in the load transmission portion from the gusset 50 to the rear side frame 12. Can be suppressed. As a result, the load transmission in the rear side frame 12 and the rear side frame 12 3 cross member 24 and No. 3 The load transmission to the opposite side in the vehicle width direction via the four cross member 26 (see FIG. 1) can be satisfactorily realized.

  The shape of the bulkhead 90 will be described with reference to FIG.

  The bulkhead 90 includes a partition wall 91 that partitions the closed cross section of the rear side frame 12 back and forth, and a plurality of flanges 93, 94, 95, 96, 97 (93 to 97) provided at the peripheral edge of the partition wall 91. Have

  The partition wall portion 91 has a shape that substantially matches the cross-sectional shape of the rear side frame 12, and a notch portion 92 for avoiding interference with the bulging portion 29 of the rear side frame member 28 at the lower edge portion of the partition wall portion 91. Is formed in a semicircular shape, for example. For example, a pair of left and right beads 98 and 99 are formed in the partition wall portion 91. Each bead 98, 99 is formed so as to protrude forward from the partition wall portion 91, for example. The bead 98 on the outer side in the vehicle width direction is provided so as to extend substantially along the vertical direction at a portion outside the bolt insertion hole 100 on the outer side in the vehicle width direction. The bead 99 on the inner side in the vehicle width direction is disposed inside the bolt insertion hole 101 on the inner side in the vehicle width direction and is provided so as to be inclined and extend inward in the vehicle width direction toward the lower side.

  The plurality of flange portions 93 to 97 of the bulkhead 90 include an upper end flange portion 93 provided at the upper end of the bulkhead 90, a pair of left and right lower end flange portions 94, 95 provided at the lower end of the bulkhead 90, and the bulkhead. The outer flange portion 96 provided at the outer end portion in the vehicle width direction 90 and the inner flange portion 97 provided at the inner end portion in the vehicle width direction of the bulkhead 90 are provided.

  The upper end flange portion 93 is provided so as to extend rearward from the upper edge of the partition wall portion 91 and is disposed so as to contact the lower surface of the floor panel 4. Further, the upper end flange portion 93 is provided with, for example, a pair of left and right bolt insertion holes 100 and 101. As shown in FIG. 4, the bolts 102 and 103 are inserted into the bolt insertion holes 100 and 101. Further, nuts 104 and 105 for fastening the bolts 102 and 103 are welded to the lower surface of the upper end flange portion 93. The upper end flange portion 93 and the lower end flange portion 53 of the gusset 50 are overlapped with each other with the floor panel 4 sandwiched between them by bolts 102 and 103 and nuts 104 and 105 in a pair of left and right fastening portions S1 and S2. It is tightened together. Thereby, an impact load is smoothly transmitted from the gusset 50 to the rear side frame 12 via the bolts 102 and 103 and the bulkhead 90.

  Returning to FIG. 7, the lower end flange portions 94 and 95 are provided so as to extend forward from the lower edge of the partition wall portion 91 on both the left and right sides of the notch portion 92. These lower end flange portions 94 and 95 are welded to the upper surface of the bottom portion of the rear side frame member 28 (see FIGS. 4 and 5).

  The outer flange portion 96 is provided so as to extend forward from the outer edge portion of the partition wall portion 91 in the vehicle width direction. The outer flange portion 96 is welded to the inner surface of the rear side frame member 28 on the outer side in the vehicle width direction (see FIG. 4).

  The inner flange portion 97 is provided so as to extend forward from the inner edge portion of the partition wall portion 91 in the vehicle width direction. The inner flange portion 97 is welded to the inner surface of the side surface portion on the inner side in the vehicle width direction of the rear side frame member 28 (see FIG. 4).

  As shown in FIG. 4, the bulkhead 90 configured as described above is disposed in the closed cross-section portion of the rear side frame 12 in the load transmission portion from the gusset 50 to the rear side frame 12. It acts so as to effectively suppress the shape collapse.

  In the mounting state shown in FIG. 4, the gusset 50 and the floor panel 4 are compared with the upper fastening portion T1 located on the inner side in the vehicle width direction among the pair of upper and lower fastening portions T1 and T2 that fix the gusset 50 and the bracket 70. Among the pair of left and right fastening portions S1, S2 that fix the fastening portion, the fastening portion S2 located on the inner side in the vehicle width direction is disposed on the inner side in the vehicle width direction. Therefore, the direction in which the gusset 50 receives a lateral load and rotates the gusset 50 around the fastening portion S2 on the inner side in the vehicle width direction with the floor panel 4 (direction of arrow M in FIG. 4), that is, the gusset 50 in the vehicle width direction. When a moment in the direction of tilting inward occurs, the movement of the gusset 50 in the direction of tilting inward in the vehicle width direction is caused by the fastening portion T1 to the bracket 70 on the inner side in the vehicle width direction than the fastening portion S2 to the floor panel 4. It is effectively suppressed as compared with the case where it is provided. Therefore, the mounting stability of the gusset 50 when an impact load is input from the side of the vehicle can be enhanced.

  4, the bead 99 on the inner side in the vehicle width direction of the bulkhead 90 is located on the inner side in the vehicle width direction from the lower vicinity of the fastening portion S2 between the gusset 50 and the floor panel 4 on the inner side in the vehicle width direction. It is arranged so as to extend obliquely downward. When the impact load from the side of the vehicle is transmitted from the gusset 50 to the floor panel 4, the fastening portion S2 between the gusset 50 and the floor panel 4 on the inner side in the vehicle width direction has the gusset around the fastening portion S2 as described above. When a moment is generated in a direction (indicated by an arrow M in FIG. 4) in which the 50 is rotated so as to be tilted inward in the vehicle width direction, a downward load is easily concentrated. Can be smoothly transmitted downward through the beads 99. Thereby, the load dispersion | distribution in the load transmission part from the gusset 50 to the rear side frame 12 can be implement | achieved more effectively, and the cross-sectional collapse of the rear side frame 12 can be suppressed more effectively. Therefore, the load transmission from the gusset 50 to the rear side frame 12 and the load transmission in the rear side frame 12 are satisfactorily realized.

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, the case where the gusset 50 is fixed to the floor panel 4 and the bracket 70 at the pair of fastening portions S1, S2, T1, and T2 has been described. You may make it fix to the bracket 70 with one or three or more fastening parts, respectively.

  In the above-described embodiment, the case where the gusset 50 is fixed to the front portion of the rear wheel house 34 via the bracket 70 has been described. However, in the present invention, the gusset integrated with the bracket is directly connected to the rear wheel house. You may employ | adopt the structure fixed to the front part of the part 34. FIG. In this case, the number of fastening portions between the gusset and the rear wheel house portion may be one or plural.

  As described above, according to the present invention, when an impact load is input to the rear door from the side of the vehicle, the impact load is effectively distributed from the load transmission member through the rear side frame, so that the rear door is brought into the vehicle interior. Since the entry can be effectively suppressed, it may be suitably used in the field of manufacturing a vehicle body provided with this type of load transmission member.

1 Vehicle 4 Floor panel 10 Side sill 12 Rear side frame 14 Center pillar 16 Rear door 17 Impact bar 20 2 Cross member 22 2.5 Cross member 24 No. 3 cross member 26 4 Cross member 28 Rear side frame member 30 Rear door opening 32 Side panel 34 Rear wheel house 50 Load transmission gusset (load transmission member)
52 Gusset rising surface 53 Gusset bottom flange 54 Gusset facing surface 70 Gusset mounting bracket 90 Bulkhead 93 Bulkhead top flange 98,99 Bulkhead beads S1, S2 Fastening between gusset and floor panel T1, T2 Fastening part between gusset and bracket

Claims (4)

A side panel that forms the side of the vehicle body behind the rear door opening;
A floor panel disposed between a pair of left and right side panels;
A load transmission member disposed on the inner side in the vehicle width direction of the side panel and having a plate-like rising surface portion rising from a lower end flange portion fixed to the upper surface of the floor panel ; and a facing surface portion facing the side panel;
A rear side frame that is disposed along the lower surface of the floor panel and forms a closed cross-sectional portion that continues in the vehicle front-rear direction so as to pass under the load transmitting member,
In the load transmitting member, among the portions that connect the opposed surface portion to the closed cross-section portion via the lower flange portion, the portion that connects the upper end portion to the lower end portion of the opposed surface portion to the closed cross-section portion is Only one of the rising surface portions,
In the closed cross section, a bulkhead joined to the inner surface of the rear side frame is disposed,
The side body structure of a vehicle, wherein the bulkhead and the load transmission member are disposed so that positions in the vehicle front-rear direction overlap each other. At the upper end of the bulkhead, an upper end flange portion that comes into contact with the lower surface of the floor panel is provided,
2. The lower end flange portion and the upper end flange portion are fastened together by a fastening member at one or a plurality of fastening portions in a state where they are overlapped with each other with the floor panel interposed therebetween. Side body structure of the vehicle.   The bead extending downward from the lower side vicinity part of the fastening part located in the vehicle width direction innermost among the said fastening parts is formed in the said bulkhead, The Claim 1 or Claim 2 characterized by the above-mentioned. Side body structure of the vehicle. A rear wheel house portion that bulges inward in the vehicle width direction is formed on the side panel,
The load transmitting member has a shape with a width in a vehicle front-rear direction shorter than a width in a vertical direction, and is fixed to a front portion of the rear wheel house part directly or via a bracket. The side body structure of a vehicle according to any one of claims 1 to 3.