JP5029895B2 - Lower body structure - Google Patents

Description

  The present invention relates to a vehicle body lower structure, and in particular, includes a B pillar, a side sill, a floor panel, a floor bulging portion, and a lower slide rail of a sliding door that opens and closes a door opening behind the B pillar. It relates to the underbody structure.

  Conventionally, in a vehicle having a sliding door, a side sill and a floor panel are relatively above the ground at the time of a side collision in which another vehicle collides with the side surface of the vehicle. However, since there is a relatively large opening for the sliding door, there is a problem that the amount of deformation at the time of a side collision increases.

  On the other hand, in recent years, there is a case where a vehicle compartment space is secured by providing a vehicle floor and a side sill at a lower position. In such a case, the fall of the B pillar becomes a problem at the time of a side collision. That is, when another vehicle collides with the B-pillar, the B-pillar is bent inwardly, twisting the side sill, turning up the floor panel, and further, the B-pillar is bent into a square shape and protrudes toward the passenger compartment.

  Therefore, conventionally, as shown in FIG. 9, the seat support portion 110 is also used for the floor panel 106 or the slide rail accommodating portion 108 inside the side sill 104 near the base portion of the B pillar 100 so as to receive the side impact load. A cross member 112 extending in the vehicle width direction is provided. Further, a cross member 114 is provided on the side sill 104 in front of the B pillar 100. Or conventionally, the B pillar was reinforced based on the fact that another vehicle or the like collides with the B pillar above the side sill.

Moreover, according to the vehicle of patent document 1, providing the box-shaped member (11B) couple | bonded with the side sill so that a front seat seat rail leg part may be mounted is also disclosed. It is considered that the side sill can be reinforced to support the side impact load.
Patent Document 2 discloses a side sill structure for a sliding door.

EP13882514B1 JP 2005-001473 A

  However, it has been revealed by the present inventors' CAE analysis that the method of providing a cross member on the floor panel inside the side sill near the base of the B pillar cannot take a large side impact load. Furthermore, it has become clear that the provision of the box-like member (11B) coupled to the side sill does not sufficiently support the side impact load, and the side sill is twisted.

  Here, a rail accommodating portion (bag portion) for receiving the lower rail of the slide door is formed on the side sill of the vehicle having the slide door. The rail accommodating portion is formed inward of the bulging portion that bulges toward the passenger compartment, and the bulging portion is provided near the lower portion of the B pillar. The present inventor pays attention to this point, and if the strength in the vicinity of the B pillar can be increased by using such a bulging portion, the side sill receives the side impact load with certainty, or the side sill twists and B I thought that the pillar would not fall easily.

  The present invention has been made to solve the above-described problems of the prior art, and can improve the strength of the side sill and suppress the side sill torsion caused by the fall of the B pillar at the time of a side collision. The object is to provide a substructure.

In order to achieve the above object, according to the present invention, a B pillar, a side sill having a closed cross-section extending in the longitudinal direction of the vehicle body in which a lower end portion of the B pillar is coupled, and a vehicle width direction of the side sill A floor panel whose side edge is joined to the inner side, a floor bulge that bulges upward at the center in the vehicle width direction of the floor panel, and a slide that opens and closes the door opening behind the B pillar And a lower slide rail of the door, and the lower slide rail of the slide door bulges inwardly from the side sill above the floor panel so as to be accommodated in the lower part of the B pillar, It has a rail housing bulge that has an opening for receiving the slide rail on the outside of the side sill in the vehicle width direction. The front side of this rail housing bulge is connected to the side sill and the floor panel. Coupled forward extending portion that extends in front of the rail accommodating main body is, the front extension portion is extended forward from a lower portion of at least B-pillar, interior side surface of the front portion of the front extending portion The front leg portion of the front seat device is fixed to the section, and a cross member for connecting the front extension portion and the floor tunnel in the vehicle width direction on the floor panel is connected .

In the present invention configured as described above, a side collision load applied to the B pillar at the time of a side collision is received not only by the rail housing bulge part attached to the side sill but also by the front extension part. Here, the deformation of the vehicle body at the time of a side collision by the conventional structure will be described. First, at the time of a side collision, the B pillar falls inward, and the side sill is twisted by the B pillar. The CAE analysis reveals that the floor panel in the vicinity of the B-pillar is deformed so that it can be turned up, and then the vehicle body is deformed so that the side sill is folded inward and bites into the passenger compartment. It has become. In such a case, conventionally, only the cross member that connects the side sill and the floor tunnel can receive the load at the time of a side collision. On the other hand, in the present invention, the front extension portion is coupled to the front of the rail housing bulge portion, so that the B pillar inward tilt and the side sill twist at the time of side collision are more effective by the front extension portion. Can be suppressed. In other words, in the prior art, the rail housing bulge that receives the lower rail of the slide door extends forward only to the lower part of the B pillar, but by providing the front extension, It is possible to effectively suppress the torsional deformation of the side sill caused by the inward collapse. This is particularly effective when the rail housing bulge is higher than the floor panel and a side impact load is applied above the side sill, causing the B-pillar to fall inward and the side sill torsionally deform. is there. Furthermore, in this invention, the collision load at the time of a side collision can be disperse | distributed to a cross member via a front extension part. That is, the cross member becomes a load transmission member, and the load can be received even in the floor tunnel. Therefore, the torsional deformation of the side sill can be more effectively suppressed.

In the present invention, preferably, the rear leg portion on the outer side in the vehicle width direction of the front seat device is fixed to the upper surface portion of the rail housing bulge portion, and the outer side in the vehicle width direction of the front seat device and the vehicle The rear legs on the inner side in the width direction are connected to each other by a seat leg connecting member.
In the present invention configured as described above, the collision load at the time of a side collision can be distributed to the seat leg connecting member via the rail housing bulge portion. That is, the seat leg connecting member serves as a load transmitting member, and the load can be received even in the floor tunnel, so that the deformation of the rail housing bulge portion can be suppressed. And it can cooperate with a front extension part and can control torsional deformation of a side sill more effectively.

In the present invention, it is preferable that a rail portion that slidably supports the seat body is attached to the leg portion on the outer side in the vehicle width direction of the front seat device, and a front portion of the rail portion is a rail housing. It is fixed to the front extension part of the bulging part, and its rear part is fixed to the rail housing main body part.
In this invention comprised in this way, the rigidity of a rail accommodation expansion | swelling part and a front extension part can be improved using a seat rail.

  According to the present invention, it is possible to improve the strength of the side sill and to suppress the twisting of the side sill caused by the collapse of the B pillar at the time of a side collision.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, the structure of the vehicle body lower part structure by embodiment of this invention is demonstrated.
FIG. 1 is a plan view of a lower body structure according to an embodiment of the present invention as viewed from above, and FIG. 2 is a perspective view of the lower body structure according to an embodiment of the present invention as viewed from the front and obliquely upward.
First, as shown in FIG. 1, the vehicle body 1 bulges upward at the center in the vehicle width direction and extends in the vehicle longitudinal direction by forming a floor tunnel 2 extending in the vehicle longitudinal direction and a closed cross section at the vehicle side. It has a side sill 4, a floor panel 6 that extends in a plane between the side sill 4 and the floor tunnel 2, and a floor kick-up portion 8 that is coupled to the front of the floor panel 6 and extends obliquely upward. A rear floor panel 7 is formed on the rear side of the floor panel 6 so as to be continuous with the floor panel 6, and a rear portion thereof is extended at a position higher than the floor panel 6, and they are continuously formed with an inclined portion 7 a. .

The floor panel 6 is made of a steel plate integrally formed with the floor tunnel 2, and the outer side edge portion thereof is coupled to the side sill 4.
In addition, the vehicle body 1 has a B pillar 10 that extends in the vertical direction of the vehicle body at a side portion of the vehicle body and has a lower end portion coupled to the side sill 4. Further, on the front side of the B pillar 10, there is an A pillar 11 (see FIG. 2) extending in the vicinity of the boundary between the floor panel 6 and the floor kick-up portion 8 and obliquely upward from the front end portion of the side sill 4. A door opening 13 for a sliding door is formed behind the B pillar 10.
A front seat 14 is disposed between the floor tunnel 2 and the side sill.

  Here, as shown in FIG. 1, the side sill 4 includes a side sill outer panel 4a, a side sill inner panel 4b, and a side sill reinforcement 4c. The side sill outer panel 4a and the side sill inner panel 4b form a closed cross section. (See FIG. 3). The side sill inner panel 4b is divided into a front side sill inner panel 4d and a rear side sill inner panel 4e. These inner panels 4d and 4e are connected by sill inner central portions 20a and 20b as will be described later.

  The B pillar 10 includes a B pillar outer panel 10a and a B pillar inner panel 10b, and a closed cross section is formed by the B pillar outer panel 10a and the B pillar inner panel 10b. The B pillar outer panel 10a is formed continuously with the side sill outer panel 4a.

  Next, as shown in FIG. 1 and FIG. 2, a rail housing bulging portion (bag) for housing a lower slide rail 28 (see FIG. 5) of a sliding door (not shown) in the vicinity of the lower end portion of the B pillar 10. Part) 20 is formed. The rail housing bulging portion 20 bulges inward from the side sill 4 above the floor panel 6 so as to accommodate the lower slide rail of the slide door in the lower part of the B pillar 10 and the lower slide rail. An opening 20e (see FIG. 5) for receiving is provided on the outer side of the side sill 4 in the vehicle width direction.

  The rail accommodating bulging portion 20 includes an upper sill inner central portion 20a and a lower sill inner central portion 20b coupled to the side sill inner panel 4b. The upper sill inner central portion 20a and the lower sill inner central portion 20b have their front ends connected to the rear end of the front side sill inner panel 4d and their rear ends connected to the rear side sill inner panel 4e. . The rail housing bulging portion 20 includes a top surface portion 21 extending in a trapezoidal shape in plan view, a first side surface portion 22 extending so as to constitute an inner side surface of the rail housing bulging portion 20 in the vehicle width direction, It has two side parts 23 and a third side part 24.

  A rear side frame extension 26 is continuously provided behind the third side surface portion 24 of the rail housing bulge portion 20. The rear side frame extension 26 has an outer side edge portion coupled to the rear side sill inner panel 4e, and an end portion on the inner side surface in the vehicle width direction is formed continuously with the rear floor panel 7. .

  Next, as shown in FIGS. 1 and 2, a front extending portion 30 that extends the rail housing main body 20 forward is coupled to the front of the rail housing bulging portion 20. The front extending portion 30 has a first flange portion 30a coupled to the first side surface portion 22 of the rail housing bulging portion 20, a second flange portion 30b coupled to the front side sill inner panel 4d, The flange part 30c is couple | bonded with the floor panel 6 (refer FIG. 3). And the front extension part 30 has the upper surface part 31, the front surface part 32, and the side part 33, These surface parts 31, 32, 33, the floor panel 6, and the front side sill inner panel 4d, The first side surface portion 22 of the rail housing bulging portion 20 is formed in a box shape having a closed cross section.

  Next, as shown in FIGS. 1 and 2, No. 2 extends in the vehicle width direction between the front extension 30 and the floor tunnel 2. Two cross members 40 are provided. This No. The two cross members 40 are formed by closing members having a U-shaped cross section from above the floor panel 6 by a flange portion 40a to form a closed cross section. The outer end portion in the vehicle width direction is coupled to the upper surface portion 31 of the front extension portion 30 by the first flange piece 40b (see FIG. 3), and the front portion of the front extension portion 30 by the second flange piece 40c. 32 and is coupled to the side surface portion 33 of the front extension 30 by a third flange piece (not shown). Further, the inner end in the vehicle width direction is coupled to the floor tunnel 2 by a flange piece 40d.

  No. 2 A member having a U-shaped cross-section from the upper side of the floor panel 6 is joined to the rear of the cross member 40 by a flange portion 42a to form a closed cross section. A 2.5 cross member 42 is provided. This No. The 2.5 cross member 42 extends in the vehicle width direction between the rail accommodating bulging portion 20 and the floor tunnel 2. The outer end portion in the vehicle width direction is coupled to the second side surface portion 23 of the rail accommodating bulging portion 20 by the flange piece 42b. Similar to the two cross member 40, it is connected to the floor tunnel 2 by a flange piece (not shown).

  Next, as shown in FIGS. 1 and 2, the front leg 51 of the seat rail 50 on the outer side in the vehicle width direction is attached to the front extension portion 30, and the rail housing bulge portion 20 has this The rear leg 52 of the seat rail 50 is attached, The front leg 55 of the seat rail 54 on the inner side in the vehicle width direction is attached to the end of the cross member 40 on the floor tunnel 2 side. A rear leg 56 of the seat rail 54 is attached to the end of the 2.5 cross member 42 on the floor tunnel 2 side.

The seat rails 50 and 54 on the outer side in the vehicle width direction and the inner side in the vehicle width direction are respectively attached to the lower rails 50a and 54a and the front seat 14 so as to be slidable with respect to the lower rails 50a and 54a. Upper sliders 50b and 54b are provided.
End portions of a connecting pipe (seat leg connecting member) 60 for connecting them in the vehicle width direction are coupled to the rear leg portions 51 and 55 of the seat rails 50 and 54, respectively.

Next, a cross-sectional structure of the lower body structure according to the embodiment of the present invention will be described with reference to FIGS.
3 is a cross-sectional view of the vehicle body lower structure taken along line III-III in FIG. 2, and FIG.
FIG. 5 is a cross-sectional view of the vehicle body lower structure taken along line IV-IV, FIG. 5 is a cross-sectional view of the vehicle body lower structure taken along line VV in FIG. 2, and FIG. It is sectional drawing of the vehicle body lower structure seen along VI line.
First, as shown in FIGS. 3 to 5, a floor frame (B frame) 12, which is a cross-sectional hat-shaped reinforcing member opened from the lower side of the vehicle body to the upper side, is coupled to the lower part of the floor panel 6. The floor frame 12 extends in the longitudinal direction of the vehicle body. As shown in FIGS. 3 and 5, the floor tunnel 2 bulges toward the upper side of the vehicle body and is reinforced by a gusset 2 a that functions as a tunnel reinforcement.

Next, as shown in FIG. 3, in this cross-sectional position, in addition to the side sill outer panel 4a, side sill inner panel 4b, and side sill reinforcement 4c of the side sill 4, the side sill inner brace 4f includes the side sill inner panel 4b and the side sill reinforcement. And the ment 4c.
In this cross-sectional position, No. Two cross members 40 are provided, and the outer end portions in the vehicle width direction are coupled to the front extending portions 30. The front leg 51 of the seat rail 50 on the outer side in the vehicle width direction is attached to the upper surface 31 of the front extension 30. The front leg 55 of the seat rail 54 on the inner side in the vehicle width direction is attached to the upper surface of the two cross member 40.

  The front extension 30 is formed to be substantially rectangular at this cross-sectional position. The second flange portion 30b of the front extension portion 30 is coupled to the front side sill inner panel 4d, and the third flange portion 30c of the front extension portion 30 is coupled to the floor panel 6. No. The first flange piece 40 b of the two cross member 40 is coupled to the upper surface portion 31 of the front extension portion 30.

Next, as shown in FIG. 4, at this cross-sectional position, a slide door rail box 70 is provided at the lower portion of the upper sill inner central portion 20a and on the outer side in the vehicle width direction of the lower sill inner central portion 20b. Yes.
Further, in the cross-sectional position shown in FIG. 4, the front extension 30 is joined to the first side surface 22 of the lower acyl inner central portion 20b by the first flange 30a and is formed in a substantially rectangular shape. Further, the third flange portion 30 c of the front extension portion 30 is coupled to the floor panel 6.

  Next, as shown in FIG. A 2.5 cross member 42 is provided, and an outer end portion in the vehicle width direction is coupled to the second side surface portion 23 on the side surface of the lower acyl inner central portion 20b. The rear leg portion 52 of the seat rail 50 on the outer side in the vehicle width direction is attached to the upper surface portion 21 formed in the upper sill inner central portion 20a of the rail accommodating bulging portion 20. The rear leg portion 56 of the seat rail 54 on the inner side in the vehicle width direction is attached to the upper surface portion of the 2.5 cross member 42.

Next, as shown in FIG. 5, a rail box upper 20c is formed below the upper sill inner central portion 20a in the rail accommodating bulging portion 20, and a lower roller guide rail is formed on the lower surface of the rail box upper 20c. A lower slide rail (seat rail) 28 is attached. An end portion on the inner side in the vehicle width direction of the rail box upper 20c is bent downward to be coupled to the side sill inner brace 4f, and an outer end portion in the vehicle width direction is coupled to the B pillar reinforcement 10c. ing. The B pillar reinforcement 10c is located inward of the B pillar outer panel 10a.
As shown in FIGS. 5 and 6, the side sill 4 receives the slider (not shown) below the slide door (not shown) and accommodates the lower slide rail 28 that engages with the slider. 20e is formed.

  Further, a rail box lower 20d is formed below the rail box upper 20c so as to face the rail box upper 20c. The inner end of the rail box lower 20d in the vehicle width direction is coupled to the side sill inner brace 4f, and the outer end in the vehicle width direction is sandwiched between the side sill outer panel 4a and the side sill reinforcement 4c. Combined with them.

  Next, as shown in FIG. 6, at this cross-sectional position, a member having a U-shaped cross section is attached below the rear floor panel 7 to form a closed cross section. Three cross members 48 are provided. The rear side sill inner panel 4e is formed in an L-shaped cross section on the inner side in the vehicle width direction, one L-shaped end portion is coupled to the rear side frame extension 26, and the other L-shaped end portion is A rear side frame 13 coupled to the side surface of the rear side sill inner panel 4e is provided. The rear side frame 13 has a front end portion coupled to the third side surface portion 24 of the rail housing bulging portion 20 and extends rearward in the longitudinal direction of the vehicle body.

  Further, as shown in FIG. 6, the side sill 4 has a lower end portion bent in an L shape between the side sill outer panel 4a and the side sill reinforcement 4c, and an upper end portion thereof is an L shape. A rail box lower 20d that is bent upward is provided. A rail box upper 20c is provided so as to face the upper side of the rail box lower 20d, and is coupled to the side sill inner brace 4f together with the rail box lower 20c.

Next, with reference to FIGS. 1, 7, and 8, the configuration of the rear leg portions 52 and 56, the seat leg connecting member 60, and the coupling to the seat leg will be described. FIG. 7 is a rear view showing the configuration of the rear leg portion of each seat rail and the seat leg connecting member, and FIG. 8 is an oblique view from above for explaining the peripheral structure of the rear leg portion of the seat rail. FIG.
First, as shown in FIG. 7, each end of a connecting pipe (seat leg connecting member) 60 that connects them in the vehicle width direction is arc welded to each rear leg 52, 56 of each seat rail 50, 54. Are combined. The rear leg portion 52 on the outer side in the vehicle width direction is bolted to the upper surface portion 21 of the rail housing bulge portion 20. 2.5 It is bolted to the upper surface of the cross member 42. Seat rails 50 and 54 are attached to the upper portions of the leg portions 52 and 56, respectively.

  Further, as can be seen in FIG. 1, the connecting pipe 60 is bent forward in the vehicle width direction center, and as shown in FIG. 7, the vehicle width direction center is bent upward. ing. In this way, the occupant's feet in the rear seat (not shown) can be easily placed under the front seat 14. In addition, the vehicle width direction center part of the connection pipe 60 may be either bent forward or bent upward.

  Next, as shown in FIG. 8, the rear leg portion 56 (same for 52) is integrally formed by press molding, and is provided with a side surface portion 56a (52a). An end portion of a connection pipe 60 made of a hollow steel pipe is joined to the side surface portion 56a (52a) by arc welding.

Next, the function and effect of the embodiment of the present invention will be described.
According to the embodiment of the present invention, the lower slide rail 28 of the slide door is bulged inward from the side sill 4 above the floor panel 6 so as to be accommodated in the lower part of the B pillar 10, and the lower slide rail. 28 has a rail accommodating bulging portion 20 having an opening for receiving 28 on the outer side in the vehicle width direction of the side sill 4, and is coupled to the side sill 4 and the floor panel 6 on the front side of the rail accommodating bulging portion 20. A front extension 30 extending in front of the rail housing main body 20 is coupled.
According to such a configuration, the side impact load applied to the B pillar 10 at the time of a side collision is received not only by the rail housing bulging portion 20 attached to the side sill 4 but also by the front extension portion 30.

  Here, the deformation of the vehicle body at the time of a side collision according to the conventional structure will be described. First, at the time of a side collision, the B pillar 10 falls inward, and accordingly, the side sill 4 is twisted by the B pillar 10. The floor panel 6 in the vicinity of the B-pillar 10 is deformed so that it can be turned up, and then the vehicle body is deformed so that the side sill 4 is folded inward and bites into the vehicle interior. It has become clear. In such a case, conventionally, only a cross member connecting the side sill 4 and the floor tunnel 2 can receive a load at the time of a side collision.

  On the other hand, in the present invention, since the front extension 30 is coupled to the front of the rail housing bulge 20, the B pillar 10 is tilted inward and the side sill 4 is twisted forward in a side collision. The portion 30 can be effectively suppressed. In other words, in the prior art, the rail accommodating bulging portion 20 that receives the lower rail 28 of the sliding door extends only forward to the lower part of the B pillar 10, but by providing the front extending portion 30, Thus, the torsional deformation of the side sill 4 caused by the internal fall of the B pillar 10 can be effectively suppressed. This is particularly the case when the rail housing bulge 20 is located higher than the floor panel 6 and a side impact load is applied above the side sill 4 to cause the B pillar to fall inward and torsionally deform the side sill. It is effective for.

Next, the front extending portion 30 extends forward from the lower portion of the B pillar 10, and the front leg portions 51, 55 of the front seat device 14 are provided on the vehicle inner side surface portion of the front portion of the front extending portion 30. Is fixed and the front extension 30 and the floor tunnel 2 are connected in the vehicle width direction on the floor panel. Two cross members 40 are joined.
With such a configuration, the collision load at the time of a side collision can be obtained through the front extension part 30 as No. The two cross members 40 can be dispersed. That is, no. 2 The cross member 40 becomes a load transmission member, and the load can be received even in the floor tunnel 2. Therefore, the torsional deformation of the side sill 4 can be more effectively suppressed.

Next, the rear leg portion 52 on the outer side in the vehicle width direction of the front seat device 14 is fixed to the upper surface portion 21 of the rail accommodating bulging portion 20, and the outer side in the vehicle width direction and the vehicle width of the front seat device 14. The rear leg portions 52 and 56 on the inner side in the direction are connected to each other by a seat leg connecting member 60.
With such a configuration, the collision load at the time of a side collision can be distributed to the seat leg connecting member 60 via the rail housing bulging portion 20. That is, the seat leg connecting member 60 serves as a load transmitting member, and the load can be received by the floor tunnel 2 to suppress deformation of the rail housing bulging portion 20. And it can cooperate with the front extension part 30 and can suppress the torsional deformation of the side sill 4 more effectively.
In addition, since a load transmission member can be comprised by such a seat leg coupling member 60, it is No. The 2.5 cross member 42 may not be provided.

Next, a seat rail 50 that slidably supports the seat main body 14 is attached to the leg portions 51 and 52 on the outer side in the vehicle width direction of the front seat device 14, and a front portion 51 of the seat rail 50 is provided. The rail housing bulging portion 20 is fixed to the front extension 30, and its rear portion 52 is fixed to the rail housing main body 20.
With such a configuration, the rigidity of the rail housing bulging portion 20 and the front extending portion 30 can be improved using the seat rail 50.

It is the top view which looked at the vehicle body lower part structure by embodiment of this invention from upper direction. It is the perspective view which looked at the vehicle body lower part structure by embodiment of this invention from the front and diagonally upward. It is sectional drawing of the vehicle body lower structure seen along the III-III line of FIG. It is sectional drawing of the vehicle body lower structure seen along the IV-IV line of FIG. It is sectional drawing of the vehicle body lower structure seen along the VV line of FIG. It is sectional drawing of the vehicle body lower structure seen along the VI-VI line of FIG. It is the rear view seen from back which shows the composition of the back leg part of each seat rail, and a seat leg connecting member. It is the perspective view seen from diagonally upward for demonstrating the periphery structure of the back leg part of a seat rail. It is the perspective view which looked at the lower body structure by the prior art from the front and diagonally upward.

Explanation of symbols

2 Floor tunnel 4 Side sill 6 Floor panel 10 B pillar 14 Front seat 20 Rail housing bulging part 20a Upper sill inner center part 20a
20b Lower acyl inner central part 20b
20c Rail box upper 20d Rail box lower 20e Opening 21 Upper surface portions 22, 23, 34 of rail accommodating bulging portion Side surface portion 28 of rail accommodating bulging portion Lower slide rail 30 Front extending portions 30a, 30b, 30c Flange portion 31 Front surface portion 32 of the front extension portion Front surface portion 33 of the front extension portion Side surface portion 40 of the front extension portion 2 Cross member 42 2.5 Cross member 50 Side sill side seat rail 51, 52 Seat rail leg 54 Floor tunnel side seat rail 55, 56 Seat rail leg 60 Connecting pipe (seat leg connecting member)

Claims (3)

A floor with a B pillar, a side sill having a closed cross-section extending in the longitudinal direction of the vehicle body coupled to the lower end of the B pillar, and a side edge of the side sill being coupled to an inner side in the vehicle width direction of the side sill A vehicle body lower structure having a panel, a floor bulging portion that bulges upward at a center portion in the vehicle width direction of the floor panel, and a lower slide rail of a sliding door that opens and closes a door opening behind the B pillar. There,
The lower slide rail of the slide door swells inward from the side sill above the floor panel so as to be accommodated in the lower part of the B pillar, and an opening for receiving the lower slide rail is provided in the vehicle of the side sill. Having a rail housing bulge on the outer side in the width direction;
A front extension portion coupled to the side sill and the floor panel and extending to the front of the rail accommodation main body portion is coupled to the front side of the rail accommodation bulge portion, and the front extension portion is at least The front leg portion of the front seat device is fixed to the vehicle interior side surface portion of the front portion of the front extension portion from the lower portion of the B pillar, and the front extension portion and the floor tunnel are connected to the front extension portion. A vehicle body lower structure, wherein a cross member connected in the vehicle width direction is coupled on a floor panel . The rear leg portion on the outer side in the vehicle width direction of the front seat device is fixed to the upper surface of the rail housing bulge,
The vehicle body lower part structure according to claim 1 , wherein the rear leg portions on the vehicle width direction outer side and the vehicle width direction inner side of the front seat device are connected to each other by a seat leg connecting member. A rail portion that slidably supports the seat main body is attached to a leg portion on the outer side in the vehicle width direction of the front seat device, and a front portion of the rail portion is a front extension portion of the rail housing bulge portion. The vehicle body lower structure according to claim 1 or 2 , wherein a rear portion thereof is fixed to the rail housing main body.

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