JP4715341B2 - Lower body structure of sliding door car - Google Patents

Description

  The present invention relates to a lower vehicle body structure in a vehicle having a side door as a slide door, and more particularly to a lower vehicle body structure of a slide door vehicle having increased rigidity against a side impact load.

Conventionally, for example , in a vehicle such as a 1BOX or a minivan, a side door is used as a slide door. In such a slide door, the lower part of the door is supported by a side sill extending in the vehicle front-rear direction.

  When the lower portion of the door is supported by the side sill, it is common to form a slide rail accommodating recess that is recessed inward of the vehicle in the side sill outer.

  However, the side sill is an important part that supports the side impact load in the vehicle body structure.If such a slide rail receiving recess is formed, the lateral rigidity is significantly reduced, and the side sill cannot be sufficiently supported. There is a risk of internal deformation.

  Therefore, in Patent Document 1 below, a cross member extending in the vehicle width direction is joined to the vehicle inner bulged portion of the side sill inner corresponding to the vehicle inner retracting portion of the slide door, and the cross member extends in the vehicle front-rear direction. A structure is disclosed in which the lateral rigidity of the side sill is increased by joining to the side sill and the inner sill of the side sill is prevented from being bent.

JP 2005-1473 A

  By the way, it is desirable to set the floor panel of the passenger compartment at a low position in order to secure a wide compartment space. However, the side sill cannot be set to a very low position due to problems such as road surface interference. In view of this, it is conceivable that the position of the side sill is set higher than that of the floor panel in a vehicle in which the vehicle interior space is to be secured while considering road surface interference.

  Of course, even in such a case, if the side door is a sliding door, the rigidity of the side sill is reduced as described above. However, since the position of the side sill is higher than that of the floor panel, it is joined to the lower surface of the floor panel as described in Patent Document 1 above. The lateral rigidity of the side sill cannot be increased by using the cross member and the frame member.

  In addition, referring to the structure of Patent Document 1, it is conceivable to increase the rigidity of the side sill by joining a cross member and a frame member to the upper surface of the floor panel, but a frame member extending in the vehicle longitudinal direction is joined on the floor panel. As a result, the merit of lowering the floor panel and securing a large cabin space is impaired.

  Further, the frame member simply joined to the floor panel may not sufficiently support the side impact load when a large side impact load is input.

  In view of this, the present invention provides a lower body structure of a sliding door vehicle in which the side door is a sliding door, while the side sill is set at a position higher than the floor panel to secure a wide cabin space, while the lateral rigidity of the side sill is increased. A further object of the present invention is to provide a lower body structure of a sliding door vehicle that can be further enhanced and can reliably support a side impact load acting on the vehicle.

The lower body structure of the sliding door vehicle according to the present invention includes a side sill that extends in the vehicle front-rear direction at the lower edge of the side door opening of the vehicle body, a floor panel that is joined to the lower portion of the side sill and constitutes a passenger compartment floor, and the side sill Comprises a side sill inner and a side sill outer, and the side sill outer has a lower body structure for a sliding door vehicle for receiving a lower rail for supporting the lower part of the sliding door, wherein the side sill inner includes the rail housing. Forms a bulging part that bulges toward the vehicle inward side at the position where the recess is immersed in the vehicle inward side, and forms a tunnel part protruding upward extending in the vehicle longitudinal direction at the center in the vehicle width direction on the floor panel and, and said bulging portion and said tunnel portion, provided with a cross member that connects extending in the vehicle width direction on the floor panel, the cross member The ends of the vehicle width direction outside, before and after a position overlapping with the rail accommodating recess in a plan view located within the bulging portion of the side sill inner, and is obtained by installing a height that overlaps in side view.

  According to the above configuration, the bulging part formed on the side sill inner and the tunnel part formed on the floor panel are connected by the cross member extending in the vehicle width direction. The lateral rigidity of can be increased.

  For this reason, it is possible to increase the lateral rigidity of the side sill located above the floor panel by effectively utilizing the existing tunnel portion that protrudes upward at the center in the vehicle width direction.

  In particular, since the cross member is coupled at the bulging portion of the side sill, the side collision load can be effectively supported at the position where the side collision load of the side sill acts most.

Further, the cross member is installed at a height overlapping with a rail receiving recess located in the bulging portion of the side sill inner in a side view, and thus the rail receiving recess and the cross member are in a side view. Since it overlaps, the side impact load from the slide door acting on the rail housing recess can be reliably supported by the cross member.

For this reason, the side impact load acting on the slide door can also be supported by the cross member.

Therefore, not only the side sill but also the side impact load acting on the slide door can be supported by the cross member and the tunnel portion, so that the side sill can be prevented from being bent internally.

  As long as the cross member extends in the vehicle width direction on the floor panel and connects the bulging portion and the tunnel portion, the cross member is not particularly limited, such as a closed cross-section member, an open cross-section member, or a cylindrical member. Absent.

  In one embodiment of the present invention, the vertical height of the tunnel portion is set higher than the vertical height of the side sill.

  According to the said structure, since the height of the tunnel part which supports a side impact load is set higher than the height of a side sill, the tunnel part will exhibit the rigidity which supports a side impact load reliably.

  Therefore, the lateral rigidity of the side sill can be further increased, and the side sill can be reliably prevented from being bent internally.

  In one embodiment of the present invention, the cross member is constituted by a member member having a substantially hat-shaped cross section, both side flanges of the cross member are joined to the upper surface of the floor panel, and the upper surface of the cross member is The height is set so as to overlap with the bulging portion in a side view.

  According to the above configuration, the cross member having a substantially hat-shaped cross section is reliably joined to the floor panel, and the upper surface of the cross member overlaps the bulging portion in a side view. It is possible to receive a side impact load from the bulging portion where the side impact load works most.

  For this reason, the cross member can be effectively used as a member that increases the lateral rigidity of the side sill.

Therefore, Ru can be efficiently improved prevention effect bending the inner of the side sill.

  In one embodiment of the present invention, the cross member is constituted by a member member having a substantially hat-shaped cross section, both side flanges of the cross member are joined to the upper surface of the floor panel, and the upper surface of the cross member is The height is set so as to overlap with the rail receiving recess in a side view.

  According to the above configuration, the cross member having a substantially hat-shaped cross section is securely joined to the floor panel, and the upper surface of the cross member overlaps with the rail receiving recess in a side view. It is possible to receive the load of the rail housing concave portion to which the side collision load from the slide door acts.

  For this reason, the cross member can be effectively used as a member that increases the lateral rigidity of the side sill.

  Therefore, the effect of preventing the side sill from breaking can be efficiently improved.

  In one embodiment of the present invention, a pillar extending in the vehicle vertical direction is coupled to an upper portion of the side sill, and a lower end portion of a pillar inner constituting a part of the pillar is covered in the vehicle width direction so as to cover the bulging portion. Extending to the center side, the lower end of the pillar inner is joined to the cross member.

  According to the above configuration, the lower end of the pillar extending in the vertical direction of the vehicle is extended to the center in the vehicle width direction so as to cover the bulging portion and joined to the cross member, so that the rigidity of the pillar in the vertical direction is increased. By utilizing this, the lateral displacement of the side sill can be enhanced by suppressing the displacement of the bulging portion on the vehicle inner side.

  Further, since the lower end portion of the pillar itself is joined to the cross member, the movement of the lower end portion to the vehicle inner side is suppressed when receiving a side collision load, and the side collision rigidity can be increased.

  Therefore, it is possible to surely prevent the side sill from being bent at the time of a side collision and to prevent the pillar from being deformed.

  In one embodiment of the present invention, the cross member is formed of a member member having a substantially hat-shaped cross section, and both side flanges of the cross member are joined to an upper surface of a floor panel, and the bulging portion of the cross member is In the vicinity of the joint portion, a node member for reinforcing inside the cross member is provided.

  According to the above configuration, by providing the node member in the vicinity of the joint portion with the bulging portion of the cross member, the rigidity in the vicinity of the joint portion of the cross member is increased.

  Therefore, the side impact load from the bulging portion can be reliably supported by the cross member, and further, the effect of preventing the side sill from being folded can be improved.

  According to the present invention, it is possible to increase the lateral rigidity of the side sill located above the floor panel by effectively utilizing the existing tunnel portion extending in the vehicle longitudinal direction at the vehicle width direction center.

  In particular, since the cross member is coupled at the bulging portion, the side collision load can be effectively supported at the position where the side collision load of the side sill is most effective.

  Therefore, in the lower body structure of a sliding door car with the side door as a sliding door, the side sill is set at a position higher than the floor panel to secure a wide cabin space, while further increasing the lateral rigidity of the side sill, The acting side impact load can be reliably supported.

The embodiments of the present invention will be described in detail with reference to the drawings.
(First Embodiment)
First, referring to FIGS, a first embodiment will be described. 1 is an overall perspective view of the vehicle according to the present embodiment, FIG. 2 is a plan view of an intermediate portion of the lower body structure of the vehicle, FIG. 3 is a perspective view from the front outside the vehicle in the vicinity of the side sill of the lower body structure, and FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 2 and FIG. 6 is a detailed cross-sectional view inside the side sill.

Vehicle V employing the present embodiment, as shown in FIG. 1, a structure for opening and closing the entrance 1 rear seat slide door 2, a roof side rail 3 of the vehicle body structure, side sill 4 and the rear fender 5 In addition, slide door rails 6 for guiding a roller (not shown) of the slide door 2 are provided.

  Further, between the roof side rail 3 and the side sill 4, a B-pillar 7 that extends in the vertical direction and connects the two is defined to partition the front seat entrance / exit and the rear seat entrance 1.

  As shown in FIG. 2, the lower body structure of the vehicle V has side sills 4, 4 extending in the vehicle front-rear direction on both left and right sides, and bulges upward between the side sills 4, 4 at the center in the vehicle width direction. Cross members 10, 10, 11 that extend in the vehicle width direction and connect the side sill 4 and the tunnel portion 8 to each other are stretched on the floor panel 9 with a tunnel panel 8 extending in the vehicle longitudinal direction. , 11 are installed at a predetermined interval in the longitudinal direction of the vehicle. Of these, the cross members are located on the front side of the vehicle, the front cross members 10 and 10 are arranged below the front seat, and the one located on the rear side of the vehicle is arranged near the B pillars 7 and 7 position. Connection cross members 11, 11.

Side sill 4 described above, as shown in FIG. 6, consists of a side sill inner 41 in the vehicle width direction inner side vehicle width direction outer side of the side sill outer 42, it is both at the upper edge and lower edge of the flange They are joined to form a closed cross section.

The side sill 4, has established a sliding door lower rail 61 for supporting the bottom of the slide door 2 as described above, in response to the slide door lower rail 61, the side sill outer 42, FIG. 2 and FIG. As shown in FIG. 3, a slide rail housing recess 43 that is recessed on the vehicle inner side extends from the vicinity of the lower end of the B pillar 7 toward the vehicle rear side.

  As shown in FIG. 3, the slide rail housing recess 43 is formed with an elongated hole-shaped opening 43a extending in the vehicle front-rear direction in the side sill outer 42, and a rail bracket 43b having a substantially U-shaped cross section at the periphery of the opening 43a. It is constituted by joining.

  Further, in the vicinity of the lower end portion of the B pillar 7 of the side sill inner 41, a bulging portion 44 bulging inward of the vehicle is formed as shown in FIG. The bulging portion 44 also corresponds to the slide door lower rail 61, specifically, is configured to bulge inward of the vehicle corresponding to the retracting portion 61a of the slide door lower rail 61.

  The pull-in portion 61a of the slide door lower rail 61 has the front end portion of the slide door lower rail 61 so that the slide door 2 is pulled into the vehicle and seals the entrance 1 with the slide door 2 positioned at the front end. It is configured by bending so as to displace inside the vehicle from the rear side.

  3 is a pillar rain that extends in the vertical direction inside the B pillar 7, while 46 is a side sill rain that extends in the vehicle front-rear direction inside the side sill 4.

The detailed structure inside the side sill 4 will be further described with reference to FIG.
Inside the side sill 4 constituted by the side sill outer 42 and the side sill inner 41, a rail bracket 43b that is recessed toward the inside of the vehicle and opened to the outside as described above is provided. A slide door lower rail 61 (corresponding to the lead-in portion 61a) having a U-shaped cross section that opens downward is attached to the inner surface of the rail bracket 43b.

Further, the lower edge of the vehicle outer side of the rail bracket 43 b is joined to a reinforcing member 47 that reinforces the side sill 4 by forming a closed cross section that extends in the vehicle longitudinal direction of the side sill 4 together with the side sill outer 42. The reinforcing member 47 has its upper edge is joined to the vehicle outer lower edge of the side sill outer 42 and the rail bracket 43b as described above, the lower edge thereof, each of the side sill inner 41 and the side sill outer 42 It is integrally joined while being sandwiched between the lower edge flanges.

  A gusset 48 is provided on the underside of the rail bracket 43b. The gusset 48 has an upper edge joined to the inner side surface of the rail bracket 43 b and a lower edge joined to the reinforcing member 47.

  As shown in FIG. 3, the aforementioned B pillar 7 is composed of a pillar outer 72 (formed integrally with the side sill outer 42) provided on the outer side of the vehicle and a pillar inner 71 provided on the inner side of the vehicle. A flange formed at the end portion in the vehicle front-rear direction forms a closed section by joining the two together.

Further, as shown in FIG. 6, between the pillar outer 72 and the pillar reinforcement 45 and the pillar inner 71, and connect them to extend in the vehicle width direction, the reinforcing plate to reinforce the closed section of the B-pillar 7 73 Is provided. And the vehicle outer upper edge of the rail bracket 43b is joined to the joint at the lower end of the reinforcing plate 73.

Above the floor panel 9, as shown in FIG. 4 and FIG. 5, the lower portion of the side sill 4, specifically, the lower end of the vertical wall portion of the side sill inner 41, by joining the outer flange 91 Constitutes the passenger compartment floor. Thus, by installing the floor panel 9 in the lower part of the side sill 4, the passenger compartment floor is lowered to secure the passenger compartment space as wide as possible.

  As shown in FIG. 4, the floor panel 9 has an outer peripheral shape in the bulged portion 44 of the side sill 4 so as to be partially depressed along the shape of the bulged portion 44.

  In order to make the actual floor surface as low as possible, a stepped portion 92 that falls further downward from the outer flange 91 is formed on the periphery of the floor panel 9.

Moreover, the tunnel part 8 extended in the vehicle front-back direction as mentioned above is formed in the center part of this floor panel 9. As shown in FIG. The tunnel portion 8 is formed at the center in the vehicle width direction of the floor panel 9 in order to accommodate vehicle equipment (not shown) such as an exhaust pipe and a propeller shaft therein. Further, by forming the tunnel portion 8, the surface rigidity of the floor panel 9 is improved, and the overall rigidity of the vehicle body, in particular , the torsional rigidity is improved.

  The aforementioned connecting cross member 11 is installed between the bulging portion 44 of the side sill 4 and the tunnel portion 8 so as to extend in the vehicle width direction so as to connect both. Specifically, as shown in FIG. 5, on the floor panel 9, the inner side surface 44 a of the bulging portion 44 of the side sill 4 and the side surface 8 a of the tunnel portion 8 are installed so as to be bridged.

  As shown also in FIG. 5, the vertical height H <b> 1 of the tunnel portion 8 is set to be higher than the vertical height H <b> 2 of the side sill 4. For this reason, the rigidity of the tunnel portion 8 itself is higher than that of the side sill 4.

As shown in FIG. 4, the connecting cross member 11 is formed of a member member having a substantially hat-shaped cross section, and both side flanges 11 a are joined to the upper surface of the floor panel 9. Then, the outer end flange 11b extending in the front-rear upper and, joined to the inner surface 44a of the bulging portion 44 of the side sill 4, the inner end flange 11c (see FIG. 5), the side surface 8a of the tunnel portion 8 It is joined. In this way, the connecting cross member 11 is securely joined between the bulging portion 44 of the side sill 4 and the tunnel portion 8.

  Further, as shown in FIG. 5, the upper surface 11d of the connecting cross member 11 is set to a height h that substantially coincides with the height position of the rail bracket 43b so as to overlap in a side view.

  Next, load transmission at the time of a vehicle side collision in the lower body structure of the present embodiment configured as described above will be described.

  In the vehicle including the slide door 2 as in the present embodiment, the slide rail housing recess 43 needs to be formed in the side sill 4 as described above due to the provision of the slide door 2, and the closed cross section of the side sill 4 is provided. Decreases, and the lateral rigidity of the side sill 4 is extremely reduced.

  For this reason, when a side impact load is applied from the side of the vehicle, the side sill 4 tends to bend inwardly toward the vehicle inner side.

  However, in this embodiment, since the bulging portion 44 of the side sill 4 is connected to the tunnel portion 8 by the connecting cross member 11 extending in the vehicle width direction, the connecting cross member 11 is stretched against the side impact load, and the tunnel The part 8 supports the side impact load. For this reason, the lateral rigidity of the side sill 4 is improved, and inward bending deformation is suppressed. In particular, since the connecting cross member 11 is coupled at the bulging portion 44 at the position where the most side impact load acts, the side impact load can be effectively supported.

In addition, since the side impact load is reliably supported by using the tunnel portion 8 having high rigidity, the deformation of the side sill 4 at the time of the side impact can be reduced as much as possible, and the slide rail housing recess 43 is formed in the side sill 4. Even so, the reduction in the lateral rigidity of the side sill 4 can be minimized.

  Furthermore, the rail bracket 43b that supports the slide door 2 via the slide door lower rail 61, the connecting cross member 11, specifically, the upper surface 11d of the connecting cross member 11 is set to a height h at which both overlap in a side view. Therefore, the side impact load acting on the slide door 2 is also transmitted directly to the upper surface 11d of the connecting cross member 11 via the rail bracket 43b, and the collision load acting on the slide door 2 is also tunneled. It can be supported by part 8.

  As described above, the side impact load applied to the side sill 4 and the sliding door 2 at the time of the vehicle side collision is transmitted to the tunnel portion 8 via the connecting cross member 11, so that the side sill 4 is prevented from being bent inwardly. Thus, it is possible to reliably support the side impact load at the time of the side impact.

  Thus, according to the lower vehicle body structure of the present embodiment, the bulging portion 44 formed on the side sill inner 41 and the tunnel portion 8 formed on the floor panel 9 are connected by the connecting cross member 11 extending in the vehicle width direction. Thus, the lateral rigidity of the side sill 4 can be increased by using the tunnel portion 8.

  For this reason, the lateral rigidity of the side sill 4 positioned above the floor panel 9 can be enhanced by effectively utilizing the existing tunnel portion 8 extending in the vehicle longitudinal direction at the center in the vehicle width direction.

  In particular, since the connecting cross member 11 is coupled by the bulging portion 44, the side collision load can be effectively supported at the position where the side collision load of the side sill 4 acts most.

  Therefore, in the lower vehicle body structure of the vehicle V using the side door as the slide door 2, the side sill 4 is set at a position higher than the floor panel 9 to secure a wide cabin space, while further increasing the lateral rigidity of the side sill 4. The side impact load acting on the vehicle can be reliably supported.

  As long as the connecting cross member 11 extends on the floor panel 9 in the vehicle width direction and connects the bulging portion 44 of the side sill 4 and the tunnel portion 8, the connecting cross member 11 has an L-shaped open cross-section member, a rectangular tube shape. It may be a member or a round cylindrical member.

  Further, in this embodiment, since the vertical height H1 of the tunnel portion 8 is set higher than the vertical height H2 of the side sill 4, the tunnel portion 8 exhibits rigidity that reliably supports the side impact load. be able to.

  Therefore, the lateral rigidity of the side sill 4 is further increased, and the side sill 4 can be reliably prevented from being bent internally.

  Further, in this embodiment, the connecting cross member 11 is constituted by a member member having a substantially hat-shaped cross section, and both side flanges 11 a of the connecting cross member 11 are joined to the upper surface of the floor panel 9. The upper surface 11d is set so as to overlap with the bulging portion 44 in a side view.

  For this reason, the upper surface 11d of the connecting cross member 11 having the highest tensile rigidity can receive a side impact load from the bulging portion 44 where the side impact load acts most. 4 can be effectively used as a member for increasing the lateral rigidity.

  Further, in this embodiment, since the connecting cross member 11 is installed so as to overlap with the rail bracket 43b in a side view, a side collision load from the slide door 2 acting on the rail bracket 43b is reliably generated. 11 will be transmitted.

  For this reason, the connection cross member 11 can be made to act efficiently also to the side impact load which acts on the slide door 2. FIG.

  Therefore, the side sill 4 is prevented from inward folding because the side cross support structure by the connecting cross member 11 and the tunnel portion 8 can be applied not only to the side sill 4 but also to the side load acting on the slide door 2. The effect can be improved.

  In this embodiment, the connecting cross member 11 is formed of a member member having a substantially hat-shaped cross section, and both side flanges 11a of the connecting cross member 11 are joined to the upper surface of the floor panel 9 so that the upper surface of the connecting cross member 11 is joined. 11d is set so as to overlap with the rail bracket 43b in a side view, the upper surface of the connecting cross member 11 having the highest tension rigidity is loaded with the load from the rail bracket 43b on which the side impact load from the slide door 2 acts. Will receive.

  For this reason, the connecting cross member 11 having a substantially hat-shaped cross section can be effectively used as a member for increasing the lateral rigidity of the side sill 4.

  Therefore, the inner fold prevention effect of the side sill 4 can be improved efficiently.

  In this embodiment, the rail bracket 43b and the side sill outer 42 are formed as separate members. However, the side sill outer 42 itself may be formed as a single member by integrally forming a recess.

Further, the height position of the connecting cross member 11 may be set lower than the height position of the rail bracket 43b.
( Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 7 is a perspective view of the vicinity of the side sill near the side sill corresponding to FIG. 4 of the first embodiment, and FIG. 8 is a detailed sectional view of the inside of the side sill corresponding to FIG. Note that the entire unillustrated structure is similar to the first embodiment described above, also, for the illustrated structure, the structure of the similar to the first embodiment, its description is omitted with the same reference numerals .

  In the present embodiment, as shown in FIG. 7, the lower end portion of the pillar inner 71 of the B pillar 7 is extended to the center side in the vehicle width direction so as to cover the bulging portion 44 of the side sill inner 41. That is, the bulging portion 44 of the side sill inner 41 is covered by the bulging portion 44 of the side sill inner 41 so as to be substantially entirely surrounded by the extending portion 170 at the lower end of the pillar inner 71 of the B pillar 7 positioned above. It is configured to increase.

  An outer end flange 11 b of the connecting cross member 11 is joined to the extending portion 170 at the lower end of the pillar inner 71 and is connected to the connecting cross member 11. For this reason, the side impact load transmitted from the side sill 4 is also transmitted to the B pillar 7. Accordingly, the vertical rigidity of the B pillar 7 can also improve the lateral rigidity of the side sill 4.

  As described above, according to the present embodiment, the extending portion 170 at the lower end of the pillar inner 71 constituting a part of the B pillar 7 is extended to the center side in the vehicle width direction so as to cover the bulging portion 44 of the side sill inner 41. By connecting the extending portion 170 to the connecting cross member 11, the displacement of the bulging portion 44 on the vehicle inner side is suppressed by utilizing the vertical rigidity of the B pillar 7, and the side sills The lateral rigidity of 4 can be increased.

  Further, since the lower end portion of the B pillar 7 itself is joined to the connecting cross member 11, the movement of the lower end portion of the B pillar 7 to the vehicle inner side is suppressed when a side collision load is received, and the side collision rigidity is increased. Can be increased.

  Therefore, it is possible to surely prevent the side sill 4 from being bent at the time of a vehicle-side collision and to prevent the B pillar 7 from being deformed.

  Further, in this embodiment, as can be seen from FIG. 8, the extending portion 170 at the lower end of the pillar inner 71 is provided below the rail bracket 43b.

  Therefore, not only the side impact load of the side sill 4 but also the impact load from the slide door 2 can be received, and the rigidity of the side sill 4 can be further improved.

  Other functions and effects are the same as those in the above-described embodiment.

In the present embodiment, the extended portion 170 at the lower end of the pillar inner 71 is provided so as to cover the bulged portion 44 of the side sill inner 41, but the side sill inner 41 in the portion where the extended portion 170 is located is The side sill inner 41 of the part is not necessarily required to be overlapped, and the lower half of the bulging part 44 can be covered with the extension part 170.
( Third embodiment)
Next, a third embodiment will be described with reference to FIGS. FIG. 9 is a detailed cross-sectional view of the inside of the side sill according to the third embodiment, and FIG. 10 is a single perspective view of a joint bracket provided in the connecting cross member. Note that the entire structure (not shown) is the same as that of the above-described embodiment, and the structure shown in the drawing is the same as that of the above-described embodiment, and the description thereof is omitted.

  In the present embodiment, as shown in FIG. 9, a node bracket 200 is provided in the vicinity of the connecting portion with the bulging portion 44 inside the connecting cross member 11 to increase the rigidity in the vicinity of the connecting portion of the connecting cross member 11. . That is, by providing the node bracket 200, the tension rigidity is higher than that of a normal cross member, and the side cross load from the side sill 4 can be reliably supported by the connecting cross member 11.

  As shown in FIG. 10, this node bracket 200 is formed by bending a flat steel plate into a crank shape, with a contact receiving portion 201 at the front end, a cross member joint portion 202 on the top surface, and a vertical direction in the middle. An extending node 203 is formed and a floor joint 204 is formed at the rear end.

  The node bracket 200 is assembled by first joining the node bracket 200 directly to the connecting cross member 11 (subassembly), and then joining the connecting cross member 11 joined to the node bracket 200 to the upper surface of the floor panel 9. Then, “the contact receiving portion 201 and the side sill inner 41” and “the floor joint portion 204 and the floor panel 9” are respectively welded through welding holes or the like (not shown).

  Thus, as shown in FIG. 9, the joint bracket 200 is joined and fixed in the vicinity of the coupling portion with the bulging portion 44 inside the connecting cross member 11, thereby increasing the rigidity against the load from the side of the vehicle. be able to.

  As described above, according to the present embodiment, since the joint bracket 200 that reinforces the inside of the connection cross member 11 is provided in the vicinity of the joint portion of the connection cross member 11 with the bulging portion 44, the tensile rigidity in the vicinity of the joint portion is provided. Can be increased.

  Therefore, the side collision load transmitted from the bulging portion 44 of the side sill 4 can be reliably supported by the connecting cross member 11, and further, the effect of preventing the side sill 4 from being folded can be improved.

  In particular, since the joint bracket 200 is joined not only to the connecting cross member 11 but also to the floor panel 9 and the side sill inner 41, the joint bracket 200 can reliably increase the rigidity in the vicinity of the joint.

  The shape of the joint bracket 200 is not limited to this, and may be a box-shaped bracket member or the like as long as it increases the rigidity of the connecting cross member 11.

  Other functions and effects are the same as those in the above-described embodiment.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The rail housing recess of this invention corresponds to the slide rail housing recess 43 of the embodiment,
Similarly,
The cross member corresponds to the connecting cross member 11,
The pillar corresponds to the B pillar 7,
The lower end of the pillar inner corresponds to the extension 170,
The node member corresponds to the node bracket 200,
The present invention is not limited to the above-described embodiment, but includes an embodiment applied to the lower body structure of any sliding door vehicle.

  In the present embodiment, the vehicle is described as a minivan type vehicle, but the present invention may be implemented by a vehicle such as a sedan or a station wagon.

  Further, the present invention may be implemented in a pillarless vehicle that eliminates the B pillar.

1 is an overall perspective view of a vehicle according to a first embodiment. The top view in the intermediate part of a lower body structure. The perspective view from the vehicle exterior near the side sill. The perspective view from the vehicle interior back of the side sill vicinity. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The detailed sectional view inside a side sill. The perspective view from the vehicle back behind the side sill of 2nd Embodiment. The detailed sectional view inside a side sill of a 2nd embodiment. The detailed sectional view inside a side sill of a 3rd embodiment. The single item perspective view of a node bracket.

2 ... Slide door 4 ... Side sill 7 ... B pillar (pillar)
8 ... Tunnel part 9 ... Floor panel 11 ... Connection cross member (cross member)
11d ... Upper surface 41 ... Side sill inner 42 ... Side sill outer 43 ... Slide rail receiving recess (rail receiving recess)
44 ... bulge part 170 ... extension part 200 ... node bracket

Claims (6)

A side sill extending in the vehicle longitudinal direction at the lower edge of the side door opening of the vehicle body;
A floor panel joined to a lower portion of the side sill and constituting a passenger compartment floor;
The side sill includes a side sill inner and a side sill outer, and the side sill outer has a lower vehicle body structure for a sliding door vehicle in which a rail receiving recess for receiving a lower rail that supports a lower portion of the sliding door is formed.
In the side sill inner, at the position where the rail receiving recess is immersed in the vehicle inward side, a bulge portion that bulges in the vehicle inner side is formed,
Formed in the floor panel is a tunnel portion that protrudes upward in the vehicle width direction center and extends in the vehicle front-rear direction,
A cross member is provided that extends and connects the bulging portion and the tunnel portion in the vehicle width direction on the floor panel ,
The end of the cross member on the outer side in the vehicle width direction is installed at a front and rear position overlapping with the rail receiving recess located in the bulging portion of the side sill inner in a plan view and at a height overlapping with a side view <br>/> Lower body structure of sliding door car. The lower body structure of the sliding door vehicle according to claim 1, wherein a height of the tunnel portion in a vertical direction is set higher than a height of the side sill in a vertical direction. The cross member is composed of a member member having a substantially hat-shaped cross section,
Bonding both side flanges of the cross member to the upper surface of the floor panel,
The lower vehicle body structure of a sliding door vehicle according to claim 1, wherein an upper surface of the cross member is set to a height overlapping with the bulging portion in a side view. The cross member is composed of a member member having a substantially hat-shaped cross section,
Bonding both side flanges of the cross member to the upper surface of the floor panel,
The lower vehicle body structure of a sliding door vehicle according to claim 1 , wherein the upper surface of the cross member is set to a height that overlaps with the rail receiving recess . A pillar extending in the vehicle vertical direction is coupled to the upper portion of the side sill,
The lower end portion of the pillar inner that constitutes a part of the pillar is extended to the center side in the vehicle width direction so as to cover the bulging portion,
The lower body structure of the sliding door vehicle according to any one of claims 1 to 4 , wherein a lower end portion of the pillar inner is joined to the cross member . The cross member is composed of a member member having a substantially hat-shaped cross section,
Bonding both side flanges of the cross member to the upper surface of the floor panel,
The lower body structure of the sliding door vehicle according to any one of claims 1 to 5 , wherein a node member that reinforces the cross member is provided in the vicinity of a joint portion between the cross member and the bulge portion. Made.

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