JP2007015637A - Lower vehicle body structure for slide door vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower vehicle body structure for a slide door vehicle capable of simplifying forming and assembling work and improving formability and ease of assembling work without deteriorating sealing performance between a floor panel and a side sill, even when a swelling part swelling to inside of a vehicle is provided in a side sill inner, in the lower vehicle body structure for the slide door vehicle having slide side doors. <P>SOLUTION: As shown in the Fig. 7, the floor panel 9 constitutes a cabin floor by joining an outer flange 91 of the floor panel 9 to a joining part 49 positioned in the lower part of the side sill 4, specifically in the lower position of the swelling part 44 of the side sill inner 41 so as to overlap the swelling part 44 with the floor panel 9 in a plan view. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lower vehicle body structure in a vehicle in which a side door is a slide door, and more particularly to a lower vehicle body structure of a slide door vehicle in which the assemblability of a floor panel and a side sill is improved.

  2. Description of the Related Art Conventionally, in vehicles such as 1BOX and minivan, a side door is known as a sliding 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.

  Of course, the slide door is formed by bending the front end of the slide rail to the inside of the vehicle in order to close the entrance / exit. As a result, the slide rail receiving recess is greatly recessed toward the inside of the vehicle, and the side sill inner is formed to bulge greatly toward the inside of the vehicle at the corresponding portion.

  Also in the following Patent Document 1, a side sill outer provided with a slide rail storage portion of a slide door is disclosed, and in a portion corresponding to a slide rail bent portion of a side sill inner (floor side panel 29 in the literature) What formed the bulging part which bulges is disclosed.

Japanese Patent No. 2718141

  By the way, the floor panel and the side sill need to be reliably assembled and joined in order to ensure the sealing performance in the passenger compartment.

  However, in the case of a vehicle equipped with a sliding door as described above, it is necessary to provide a side sill inner with a bulging portion that bulges greatly toward the inside of the vehicle, so that the outer edge of the floor panel corresponds to this bulging portion. It is necessary to form a hollow portion in a part of and assemble and join.

  In this way, when the recess is formed in the floor panel and bonded in correspondence with the bulging portion of the side sill inner, the bonding is uniform and sufficient if the shape of the dent and the bulging portion do not coincide with each other. Since it cannot be performed, the problem that sealing performance deteriorates arises.

  In addition, in order to solve this problem, if the shape of the floor panel or the side sill inner is precisely formed, there arises a new problem that the forming cost increases.

  Furthermore, the workability of assembly joining also has a problem that skill is required to evenly join between the recessed portion and the bulging portion in a substantially arc shape.

  Therefore, the present invention provides a lower body structure of a sliding door vehicle having a side door as a sliding door, even when a side sill inner is provided with a bulging portion that bulges toward the inside of the vehicle. An object of the present invention is to provide a lower vehicle body structure of a sliding door vehicle that can improve and improve the moldability and assembly workability without deteriorating the sealing performance.

  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 side sill and forms a passenger compartment floor, and the side sill is a side sill. A lower body structure of a sliding door vehicle comprising an inner and a side sill outer, and a rail receiving recess for receiving a lower rail that supports the lower portion of the sliding door is formed on the side sill outer, and bulges toward the vehicle inner side of the side sill inner A swelled portion is formed, a rail receiving recess of the side sill outer is disposed in the swelled portion, and a floor panel is disposed below the side sill inner so that the floor panel overlaps the bulged portion in plan view. And a joint portion is set.

  According to the above configuration, since the joint portion with the floor panel is set at the lower portion of the side sill inner while avoiding the bulging portion, it is not necessary to form a hollow portion corresponding to the bulging portion on the outer edge of the floor panel. Side sills and floor panels can be joined.

  For this reason, it is not necessary to form a hollow portion corresponding to the shape of the bulging portion on the floor panel, and the floor panel can be configured with a conventional shape (for example, a straight shape). The floor panel and the side sill can be assembled and joined.

  Further, since the floor panel is joined at the lower part of the side sill inner, the position of the floor panel can be lowered and the vehicle compartment space can be increased.

  In one embodiment of the present invention, a tunnel portion protruding upward in the vehicle front-rear direction at the vehicle width direction center of the floor panel is formed, and the tunnel portion and the bulging portion are arranged on the floor panel. A cross member extending in the direction and connected is provided.

  According to the above configuration, the tunnel member and the bulging portion are connected by the cross member extending in the vehicle width direction, so that the lateral sill (vehicle width direction) rigidity of the side sill can be increased.

  For this reason, by forming the rail housing recess in the side sill outer, it is possible to prevent inward bending deformation at the time of a side collision in the side sill whose lateral rigidity is lowered.

  Further, by connecting the bulging part formed in a cantilevered state to the side sill inner with a cross member, the vertical movement of the bulging part can be restricted by the cross member, and the bulging part is also reinforced. be able to.

  Therefore, the rigidity of the side sill, which has been lowered by forming the rail accommodating recess and the bulging part, can be improved by the cross member, and the rigidity of the entire side sill can be improved.

  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, a support member for supporting the bulging portion is provided between the bulging portion of the side sill inner and the floor panel.

  According to the above configuration, since the bulging portion is supported by the floor panel via the support member, the vertical position of the bulging portion in the cantilever state is reliably defined (restrained).

For this reason, the vertical position of the bulging portion is reliably defined, and even if the weight of the slide door acts from the rail receiving concave portion, the bulging portion does not rattle.
Therefore, even if the bulging part is formed in a cantilever state, the rigidity of the bulging part can be increased.

  In one embodiment of the present invention, the support member is constituted by a protruding portion protruding upward from the floor panel.

  According to the said structure, in order to support a bulging part with the protrusion part which protrudes upwards from a floor panel, a bulging part will be supported by a floor panel.

  Therefore, even if it is a bulging part of a cantilever state, it becomes integral with a floor panel reliably and can improve intensity | strength.

  In one embodiment of the present invention, a work hole for spot welding is formed in a floor panel that overlaps with the bulging portion in plan view, and a substantially hat-shaped member is disposed between the working hole and the bulging portion. And while joining the upper end part of this substantially hat-shaped member to a bulging part, the lower end part is joined to the circumference | surroundings of the said working hole.

  According to the above configuration, the spot welding work hole is formed in the floor panel, and the substantially hat-shaped member disposed between the bulging portion and the floor panel is joined using the spot welding work hole. become.

  For this reason, even if it does not directly form the support portion on the floor panel itself, the bulging portion can be supported by the floor panel by joining the substantially hat-shaped member.

  Therefore, the floor panel of the same shape can be used for a general swing door vehicle that is not a slide door, and the floor panel can be shared between the slide door vehicle and the swing door vehicle.

  In one embodiment of the present invention, the support member is constituted by a vehicle outer side portion of a cross member that extends in the vehicle width direction on the floor panel and connects the bulging portion and a tunnel portion formed in the floor panel. It is a thing.

  According to the above configuration, the bulging portion is supported on the floor panel using the vehicle outer side portion of the cross member that extends and connects the bulging portion and the tunnel portion in the vehicle width direction.

For this reason, the vertical position of the bulging portion can be defined by effectively using the cross member, which is a member that increases the lateral rigidity of the side sill.
Therefore, it is possible to improve the vertical strength of the bulging portion while obtaining the side sill inner folding prevention effect.

  In one embodiment of the present invention, the cross member has a vehicle outer side portion coupled to the bottom surface portion of the bulging portion and a height in the vertical direction higher than that of the vehicle outer side portion at the vehicle center side of the bulging portion. The vehicle interior portion is set so that the vehicle interior portion overlaps the bulging portion in a side view.

  According to the above configuration, while the cross member on the inner side of the cross member reliably suppresses the intrusion into the vehicle interior at the time of a side collision of the bulging part, the vertical movement of the bulging part is suppressed on the outer side of the vehicle. Can do.

  Therefore, with one cross member, it is possible to reliably suppress the internal bending deformation at the side collision of the side sill and the displacement in the vertical direction of the bulging part, thereby improving the overall rigidity of the side sill.

  In one embodiment of the present invention, an inclined surface is formed on the upper surface portion from the vehicle outer side portion to the vehicle inner side portion of the cross member, and the abutting surface is in contact with the bulging portion at the time of a side collision of the vehicle. A member is provided.

  According to the above configuration, by providing the contact member, the impact transmission to the cross member at the time of a side collision is reliably performed by the contact member.

  Therefore, even if the cross member's inner side and the outer side have different vertical heights so that impact is not easily transmitted to the top surface of the cross member, the side impact load is reliably transmitted to the cross member. Therefore, the side sill can be prevented from being bent.

  According to the present invention, since the joint portion with the floor panel is set at the lower part of the side sill inner avoiding the bulging portion, even if the concave portion corresponding to the bulging portion is not formed on the outer edge of the floor panel, Side sill and floor panel can be joined.

  For this reason, it is not necessary to form a recess corresponding to the shape of the bulging portion in the floor panel, and the floor panel can be configured with a conventional shape (for example, a straight line shape). The panel and the side sill can be assembled and joined.

  Therefore, in the lower body structure of a sliding door vehicle using a side door as a sliding door, even if the side sill inner is provided with a bulging portion that bulges to the inside of the vehicle, the sealing property between the floor panel and the side sill is provided. It is possible to simplify and improve the moldability and assembly workability without deteriorating.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
First, the first embodiment will be described with reference to FIGS. 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 an exploded perspective view of the lower body structure, and FIG. FIG. 5 is a perspective view from the rear of the vehicle in the vicinity of the side sill, FIG. 6 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 7 is a detailed cross-sectional view inside the side sill.

  As shown in FIG. 1, the vehicle V adopting this embodiment has a structure in which the entrance 1 of the rear seat is opened and closed by a slide door 2, and the roof side rail 3, the side sill 4 and the rear fender 5 of the vehicle body structure are Slide door rails 6 are provided for guiding rollers (not shown) of the slide door 2.

  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 is provided with side sills 4 and 4 extending in the vehicle front-rear direction on both left and right sides, and between the side sills 4 and 4 at the center in the vehicle width direction. A floor panel 9 having a raised tunnel portion 8 extending in the vehicle front-rear direction is stretched, and cross members 10, 10 extending in the vehicle width direction and connecting the side sill 4 and the tunnel portion 8 are respectively formed on the upper surface of the floor panel 9. , 11 and 11 are installed at a predetermined interval in the vehicle front-rear direction. Of these, the cross member is located on the front side of the vehicle, the front cross members 10 and 10 disposed below the front seat (not shown), and the one located on the rear side of the vehicle is the B pillars 7 and 7 positions. The connecting cross members 11 and 11 are arranged in the vicinity.

  As shown in FIG. 6, the side sill 4 includes a side sill inner 41 on the inner side in the vehicle width direction and a side sill outer 42 on the outer side in the vehicle width direction, and both are joined by flanges at the upper edge and the lower edge. A closed section is formed.

  As described above, the side sill 4 is provided with the slide door lower rail 61 that supports the lower portion of the slide door 2. The side sill outer 42 corresponds to the slide door lower rail 61, as shown in FIGS. 2 and 3. As shown, a slide rail housing recess 43 that is recessed inward of the vehicle extends from the vicinity of the lower end of the B pillar 7 toward the rear of the vehicle.

  As shown in FIG. 4, the slide rail accommodating recess 43 is formed with a long 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 interior and the entrance 1 is sealed with the slide door 2 positioned at the front end. It is bent so that it is displaced to the inside of the vehicle rather than the rear side.

  4 is a pillar lane 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. As described above, the reinforcing member 47 is joined to the vehicle outer lower edge of the side sill outer 42 and the rail bracket 43b as described above, and the lower edge is sandwiched between the lower edge flanges of the side sill inner 41 and the side sill outer 42, respectively. In this state, they are joined together.

  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, a reinforcing plate 73 is provided between the pillar outer 72 and the pillar rain 45 and the pillar inner 71 to extend in the vehicle width direction and connect them to reinforce the closed cross section of the B pillar 7. ing. 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.

  As shown in FIGS. 6 and 7, the floor panel 9 includes a bulging portion 44 and a floor at a lower portion of the side sill 4, specifically, a joint portion 49 below the bulging portion 44 of the side sill inner 41. The vehicle interior floor is configured by joining the outer flanges 91 so that the panels 9 overlap in plan view. Thus, by joining the floor panel 9 to the lower part of the side sill 4, the compartment floor is lowered to secure the compartment space as wide as possible.

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

  As shown in FIG. 3, the floor panel 9 has a side end portion 9 a formed linearly in the vehicle front-rear direction regardless of the shape of the bulging portion 44 of the side sill 4. By forming in a straight line in this way, the floor panel 9 itself can be configured in the same shape as the floor panel of a normal swing door car, and the floor panel can be shared with other vehicle types. .

  In addition, by forming the side end portion 9a in a straight line, the joint portion 49 of the side sill outer 41 can be joined to the joint portion 49 of the side sill outer 41 without considering the shape of the bulging portion 44, It becomes possible to join easily.

  In addition, 12 of FIG. 3 is the rear floor panel which comprises a luggage compartment floor, and comprises the vehicle interior floor by combining this rear floor panel 12 and the floor panel 9. FIG.

  Moreover, the tunnel part 8 extended in the vehicle front-back direction as mentioned above is formed in the center part of the floor panel 9. 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, particularly 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. 6, 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. 6, 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. 5, 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 upward and forward and backward is joined to the inner side surface 44a of the bulged portion 44 of the side sill 4, and the inner end flange 11c (see FIG. 5) is joined to the side surface 8a of the tunnel portion 8. ing. Thus, the connecting cross member 11 is 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 provided with the slide door 2 as in the present embodiment, the slide rail accommodating 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 required. 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.

  Further, 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 accommodating 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.

  Further, in the present embodiment, as described above, since the side end portion 9a of the floor panel 9 is formed in a straight line and the bulging portion 44 is positioned at an upper position thereof, the floor panel 9 is set. The panel 9 can be reliably joined to the side sill outer 42, and the sealing performance in the vehicle compartment can be improved.

  Furthermore, since the bulging portion 44 that is in a cantilever state by joining the floor panel 9 to the side sill outer 42 in this way is also restrained in the vertical direction by the connecting cross member 11, the bulging portion 44. The vertical position of the bulge portion 44 can be reliably held, and rattling of the bulging portion 44 can be suppressed.

  As described above, according to the lower vehicle body structure of the present embodiment, the joint 46 with the outer flange 91 of the floor panel 9 is set at the lower portion of the side sill inner 41 while avoiding the bulging portion 44. The side sill 4 and the floor panel 9 can be joined without forming a depression or the like corresponding to the bulging portion 44 in the side end portion 9a of the ridge 9.

  For this reason, the side edge part 9a of the floor panel 9 can be comprised by linear shape as usual, and the floor panel 9 and the side sill 4 can be assembled and joined by the method similar to the past.

  Therefore, in the lower vehicle body structure of the vehicle V in which the side door is the sliding door 2, even when the side sill inner 41 is provided with the bulging portion 44 that bulges toward the inside of the vehicle, it is between the floor panel 9 and the side sill 4. In addition, the moldability and assembly workability can be simplified and improved without deteriorating the sealing performance.

  Further, since the floor panel 9 is also joined at the lower part of the side sill inner 41, the position of the floor panel 9 can be lowered, and the cabin space can be widened.

  Moreover, in this embodiment, since the tunnel part 8 and the bulging part 44 are connected by the connecting cross member 11 extending in the vehicle width direction, the lateral (vehicle width direction) rigidity of the side sill 4 can be increased. it can.

  For this reason, by forming the slide rail accommodating recess 43 in the side sill outer 42, it is possible to prevent inward bending deformation at the time of a side collision in the side sill 4 where the lateral rigidity is lowered.

  In addition, by connecting the bulging portion 44 formed in a cantilever manner to the side sill inner 41 with the connecting cross member 11, the vertical movement of the bulging portion 44 can be restrained by the connecting cross member 11. Further, the bulging portion 44 can be reinforced.

  Therefore, the rigidity of the side sill 4 that has been lowered by forming the slide rail accommodating recess 43 and the bulging part 44 can be improved by the connecting cross member 11, and the rigidity of the entire side sill 4 can be improved.

  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 tension rigidity can receive a side impact load from the bulging portion 44 where the side impact load acts most. It can be effectively used as a member that increases the lateral rigidity of the side sill 4.

  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, so that the upper surface 11d of the connecting cross member 11 having the highest tension rigidity has a load from the rail bracket 43b to which a 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 configured as separate members. However, the side sill outer 42 itself may be integrally formed with a recess.

Moreover, you may comprise so that the height position of the connection cross member 11 may be set low with respect to the height position of the rail bracket 43b.
(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 8 is an exploded perspective view of the lower vehicle body structure corresponding to FIG. 3 of the first embodiment, and FIG. 9 is a detailed sectional view of the inside of the side sill corresponding to FIG. The overall structure not shown is the same as that of the first embodiment described above. Also, in the illustrated structure, the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. To do.

  In the present embodiment, as shown in FIG. 9, the support bracket 100 is disposed between the bulging portion 44 and the floor panel 9 so that the bulging portion 44 in a cantilever state is supported by the lower floor panel 9. It is what. That is, the support bracket 100 which reinforces the bulging part 44 which will be in the state which floated in the cantilever state by joining the floor panel 9 to the lower part of the side sill 4 is provided.

  Specifically, as shown in FIG. 9, the support bracket 100 is formed of a hat-shaped bracket member, the flange portion 101 is joined to the floor panel 9, and the upper surface portion 102 is connected to the bottom surface 44 b of the bulging portion 44. By joining, it arrange | positions between the bulging part 44 and the floor panel 9. FIG.

  In particular, in joining the upper surface portion 102, the three members are joined by spot welding in order to join not only the bulging portion 44 but also the rail bracket 43b of the slide rail receiving recess 43 (shown by a one-dot chain line in FIG. 9). Is a spot welding gun G).

  By assembling and joining in this way, the support bracket 100 can completely suppress backlash in the vertical direction of the bulging portion 44, and even if the weight of the slide door 2 acts on the bulging portion 44, the support bracket 100 can reliably It can be supported by the bulging portion 44.

  In order to perform spot welding, as shown in FIG. 8, a spot welding work hole 110 is formed in a portion corresponding to a position below the bulging portion 44 of the floor panel 9. Thereby, the three of the support bracket 100, the bulging part 44, and the rail bracket 43b can be joined easily.

In addition, you may comprise so that the bulging part 44 may be supported by forming the support bracket 100 integrally in the floor panel 9 as a protrusion part.
However, in this case, it is necessary to press-mold the floor panel 9 exclusively for the sliding door vehicle.

  Therefore, in the present embodiment, a floor panel 9 for a sliding door vehicle is formed by drilling a spot welding work hole 11 later in a floor panel press-formed in common with a swing door vehicle. Thereby, the floor panel of a swing door vehicle and a slide door vehicle can be made common.

  Since the spot welding work hole 11 is completely sealed by joining the support bracket 100, the sealing performance in the passenger compartment is not deteriorated.

  As described above, according to this embodiment, since the bulging portion 44 is supported by the floor panel 9 via the support bracket 100, the vertical position of the bulging portion 44 in the cantilever state is reliably defined (restrained). Will be.

For this reason, the up-down direction position of the bulging part 44 is defined reliably, and even if the weight of the slide door 2 acts from the slide rail accommodation recessed part 43, the bulging part 44 does not rattle.
Therefore, even if the bulging portion 44 is formed in a cantilever state, the rigidity of the bulging portion 44 can be increased.

In particular, in this embodiment, the bulging portion 44 is directly supported by the floor panel 9 in order to support the bulging portion 44 by the support bracket 100 arranged so as to protrude upward from the floor panel 9.
Therefore, the bulging part 44 can be reliably integrated with the floor panel 9 to improve the strength.

  Further, according to the present embodiment, the spot welding work hole 11 is formed in the floor panel 9, and the support disposed between the bulging portion 44 and the floor panel 9 using the spot welding work hole 11. The bracket 100 is joined.

  Therefore, the bulging portion 44 can be supported by the floor panel 9 without separately forming a protruding portion that protrudes directly upward on the floor panel 9 itself.

  Therefore, the floor panel 9 having the same shape can be used for a general swing door vehicle that is not a slide door, and the floor panel 9 can be shared between the slide door vehicle and the swing door vehicle. .

Other functions and effects are the same as those in the first embodiment.
(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. FIG. 10 is a perspective view of the vicinity of the side sill in the third embodiment from the rear in the vehicle, and FIG. 11 is a detailed sectional view of the inside of the side sill. The overall structure not shown is the same as that of the above-described embodiment. Also, in the illustrated structure, the same components as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, as shown in FIGS. 10 and 11, the connecting cross member 211 is extended to a position below the bulging portion 44, and the bottom surface 44 b of the bulging portion 44 and the upper surface of the connecting cross member 211 are joined. Thus, the connecting cross member 211 is used as a support member for the bulging portion 44.

  Specifically, the vehicle outer side portion 212 of the connecting cross member 211 is formed lower than the vehicle inner side portion 213, and the vehicle outer side portion 212 is positioned under the bulging portion 44. The floor panel 9 and the bulging portion 44 are connected to each other by spot welding the upper surface 212a of the 212, the bottom surface 44b of the bulging portion 44, and the rail bracket 43b of the slide rail receiving recess 43. .

  In this case as well, spot welding work holes 110 are formed in the floor panel 9 (the one-dot chain line is a spot welding gun G) so that the welding work can be easily performed.

  In this embodiment, two spot welding points SP are set in the vehicle width direction in order to support the impact in the vehicle width direction at the time of a side collision.

  In this way, by using the connecting cross member 211 to restrain the position of the bulging portion 44 in the vertical direction, the bulging portion 44 can be supported without providing the support bracket 100 separately.

  Moreover, as shown in FIG. 11, since the vehicle interior part 213 of the connection cross member 211 is made high so that it overlaps with the bulging part 44 in a side view, the bulging part 44 is formed in a side collision. It is possible to prevent intrusion in the in-vehicle direction, and to prevent inward bending deformation when the side sill 4 collides.

  As described above, in this embodiment, the bulging portion 44 is supported with respect to the floor panel 9 by using the connecting cross member 211 that extends and connects the bulging portion 44 and the tunnel portion 8 in the vehicle width direction. Yes.

  For this reason, it is possible to constrain the vertical position of the bulging portion 44 by effectively using the connecting cross member 211 that is a member that increases the lateral rigidity of the side sill 4.

  Therefore, it is possible to improve the vertical strength of the bulging portion 44 while obtaining the effect of preventing the side sill 4 from being folded.

  Further, in this embodiment, the vehicle inner side 213 of the connecting cross member 211 reliably suppresses intrusion into the vehicle interior at the time of the side collision of the bulging portion 44, while the vehicle outer side 212 has the bulging portion 44 of the bulging portion 44. Vertical movement can be suppressed.

  Therefore, with one connecting cross member 211, it is possible to reliably suppress the internal bending deformation at the time of side collision of the side sill 4 and the vertical displacement of the bulging portion 44, and to improve the overall rigidity of the side sill 4.

Other functions and effects are the same as those in the first and second embodiments described above.
(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. FIG. 12 is a perspective view of the vicinity of the side sill of the fourth embodiment from the rear in the vehicle, and FIG. 13 is a detailed sectional view of the inside of the side sill. The overall structure not shown is the same as that of the above-described embodiment. Also, in the illustrated structure, the same components as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, a contact bracket 300 is further provided on the connecting cross member 211 in the configuration of the third embodiment. The abutting bracket 300 is configured to be able to reliably receive an impact from the side sill 4 at the time of a side collision with the connecting cross member 211, specifically, from the bulging portion 44.

  Specifically, the connecting cross member 211 is formed with an inclined surface portion 214 that is inclined upward from the vehicle outer side portion 212 to the vehicle inner side portion 213, and the contact bracket formed by bending the inclined surface portion 214 into a substantially triangular prism shape. The outer side wall surface 301 of the contact bracket 300 is provided so as to face the bulging portion 44.

  Thus, by providing the contact bracket 300, the impact at the time of a side collision is reliably transmitted to the connecting cross member 211 from the bulging portion 44 via the contact bracket 300. Thus, the inner folding deformation of 4 is reliably suppressed.

  Thereby, in this embodiment, by providing the contact bracket 300, the impact transmission to the connecting cross member 211 at the time of a side collision is reliably performed by the contact bracket 300.

  Therefore, even when the vehicle inner side 213 and the vehicle outer side 212 of the connecting cross member 211 have different vertical heights, a side impact load is reliably transmitted to the connecting cross member 211 and the side sill 4 is deformed inwardly. Can be prevented.

  The shape of the contact bracket 300 is not limited to that of this embodiment. For example, the shape of the contact bracket 300 may be a bent shape or a T shape when viewed from the front. Good.

  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,
Cross members correspond to the linked cross members 11, 211,
The pillar corresponds to the B pillar 7,
The support members correspond to the support bracket 100 and the vehicle outer side 212,
The protrusion and the substantially hat-shaped member correspond to the support bracket 100,
The contact member corresponds to the contact bracket 300,
The inclined surface corresponds to the inclined surface portion 214,
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 exploded perspective view 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 disassembled perspective view of the lower vehicle body structure of 2nd embodiment. The detailed sectional view inside a side sill of a second embodiment. The perspective view from the vehicle interior back of the side sill vicinity of 3rd embodiment. The detailed sectional view inside the side sill of a third embodiment. The perspective view from the vehicle interior back of the side sill vicinity of 4th embodiment. The detailed sectional view inside the side sill of the fourth embodiment.

Explanation of symbols

4 ... Side sill 7 ... B pillar (pillar)
8 ... Tunnel part 9 ... Floor panels 11, 211 ... Connection cross member (cross member)
41 ... Side sill inner 42 ... Side sill outer 43 ... Slide rail receiving recess (rail receiving recess)
44 ... bulge part 49 ... joint part 100 ... support bracket (support member, protrusion, substantially hat-shaped member)
110 ... Spot welding work hole 212 ... Outer side of vehicle (support member)
300 ... Abutting bracket (abutting member)

Claims (9)

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 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, forming a bulging portion that bulges inside the vehicle,
In the bulging portion, a rail receiving recess of the side sill outer is disposed,
A lower vehicle body structure of a sliding door vehicle in which a joint portion with a floor panel is set at a lower portion of the side sill inner so that the floor panel overlaps with the bulging portion in a plan view. Forming a tunnel portion protruding upward extending in the vehicle longitudinal direction at the vehicle width direction center of the floor panel,
The lower body structure of the sliding door vehicle according to claim 1, further comprising a cross member that extends and connects the tunnel portion and the bulging portion in a vehicle width direction on a floor panel. The lower body structure of the sliding door vehicle according to claim 2, wherein the vertical height of the tunnel portion is set higher than the vertical height of the side sill. The lower body structure of the sliding door vehicle according to claim 1, wherein a support member for supporting the bulge portion is provided between the bulge portion of the side sill inner and the floor panel. The lower body structure of the sliding door vehicle according to claim 4, wherein the support member is constituted by a protruding portion that protrudes upward from the floor panel. Drilling a spot welding work hole in the floor panel overlapping the bulging portion in plan view,
A substantially hat-shaped member is disposed between the spot welding work hole and the bulging portion,
6. The lower vehicle body structure of a sliding door vehicle according to claim 5, wherein the upper end portion of the substantially hat-shaped member is joined to the bulging portion and the lower end portion is joined around the spot welding work hole. The sliding door vehicle according to claim 4, wherein the support member is configured by a vehicle outer portion of a cross member that extends in the vehicle width direction on the floor panel and connects the bulging portion and a tunnel portion formed in the floor panel. Lower body structure. The cross member is connected to the bottom surface of the bulging portion;
A vehicle inner side set with a height in the vertical direction higher than the vehicle outer side on the vehicle center side from the bulging part;
The lower vehicle body structure of a sliding door vehicle according to claim 7, wherein the vehicle inner side portion is set so as to overlap the bulging portion in a side view. An inclined surface is formed on the upper surface portion from the vehicle outer side portion to the vehicle inner side portion of the cross member,
9. The lower body structure of a sliding door vehicle according to claim 8, wherein a contact member that contacts the bulging portion at the time of a side collision of the vehicle is provided on the inclined surface.

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