JP5396945B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention relates to a vehicle body lower part structure in which a cross member extending in a vehicle width direction is provided between a tunnel part at an upper part of a floor panel and a side sill.

In general, as a conventional vehicle lower body structure of a vehicle, a tunnel portion that is formed integrally or integrally with a floor panel and extends in the vehicle front-rear direction is provided, and left and right side portions of the floor panel extend in the vehicle front-rear direction. A side sill having a closed cross-sectional structure is provided, and a tunnel member on the vehicle width direction center side and a side sill on the vehicle width direction outer end side side are connected by a cross member extending in the vehicle width direction.
Conventionally, in order to positively receive a side impact load on the cross member, the cross member is completely coupled and fixed between the side sill inner of the side sill and the vertical wall portion of the tunnel portion.

  By the way, as disclosed in Patent Document 1 in recent years, the vehicle body lower part structure for improving the side impact load absorption performance by receiving the load (side impact load) while buffering the side impact. Has already been invented.

In the vehicle body lower part structure disclosed in Patent Document 1 above, a hole is formed in the ridge line portion of the cross member having a hat-shaped cross section at a portion close to the side sill on the outer side in the vehicle width direction of the cross member. The cross-sectional yield strength of the connecting portion with respect to the side sill is set smaller than the cross-sectional yield strength of the cross member body.
According to this configuration, if a side collision load is input to the cross member during a side collision, the hole is crushed. Therefore, there is an advantage that impact energy can be absorbed. On the other hand, when the hole is crushed, the cross member body If the load acting on the part suddenly rises, and the middle of the cross member in the vehicle width direction buckles downward and bends, the load cannot be received.

JP 2004-74835 A

  In view of this, the present invention provides an impact absorbing portion for reducing the impact at the time of a side collision in the vicinity of the coupling end portion of the cross member with the side sill on the outer side in the vehicle width direction, and near the outer end in the vehicle width direction of the main body portion of the cross member. A reinforcing member is provided, and the outer end portion in the vehicle width direction of the reinforcing member is provided so as to overlap the impact absorbing portion in the vehicle width direction, so that the impact absorbing portion at the end on the side sill side of the cross member While absorbing the side impact load, the wrap structure of the reinforcing member with respect to the impact absorbing portion can alleviate the rise of the load acting on the main body portion of the cross member, thereby suppressing the buckling deformation of the cross member. Another object of the present invention is to provide a vehicle body lower part structure that can reinforce a cross member against an input from the side sill side (particularly, a side collision load input) by the reinforcing member.

A vehicle body lower structure according to the present invention is a vehicle body lower structure in which a cross member extending in a vehicle width direction is provided between a tunnel portion at an upper portion of a floor panel and a side sill, and the cross member in the vehicle width direction. An impact absorbing portion for reducing impact at the time of a side collision is provided in the vicinity of the coupling end portion with the side sill on the outside, and a reinforcing member is disposed near the outer end in the vehicle width direction of the main body portion of the cross member. An outer end portion in the vehicle width direction of the member is provided so as to overlap the impact absorbing portion in the vehicle width direction, and the impact absorbing portion is notched inward in the vehicle width direction in the vicinity of the coupling end portion with the side sill of the cross member. The outer end of the reinforcing member in the vehicle width direction is provided so as to be separated from the side sill inward in the vehicle width direction.

  According to the above configuration, the impact absorbing portion at the end of the cross member on the side sill side can absorb the side impact load, and the overlap structure of both the impact absorbing portion and the reinforcing member allows the cross member main body to be absorbed. The rise of the load acting on the part can be relaxed to suppress the buckling deformation of the cross member (deformation in which the middle of the cross member in the vehicle width direction is buckled downward and bent), and the reinforcement The member can reinforce the cross member against the input from the side sill side.

Further, the impact absorbing portion is state, and are not configured as the notch portion is notched inward in a vehicle width direction at the coupling end vicinity of the side sill in the cross member, thus, notch the shock absorbing unit Therefore, the moldability and workability of the shock absorbing part can be ensured .

In addition, since the outer end portion in the vehicle width direction of the reinforcing member is provided to be separated from the side sill in the vehicle width direction, the crossing load can be reliably obtained while the impact absorbing portion absorbs the impact load. The buckling deformation of the member can be suppressed.

In one embodiment of the present invention, the reinforcing member is constituted by a seat mounting member for fixing a passenger seat to the cross member.
According to the said structure, the effect of the said Claim 1 can be acquired using a sheet | seat attachment member (reinforcement member).

In one embodiment of the present invention, the seat mounting member is a nut plate that is provided in a closed cross section between the cross member and the floor panel and holds a nut for fixing a passenger seat. .
According to the said structure, the effect of the said Claim 1 can be ensured using the said nut plate provided in the closed cross section of the cross member used as a dead space.

In one embodiment of the present invention, the strength of the reinforcing member is set to be weaker than the strength of the main body portion of the cross member.
For the above-mentioned strength setting, the strength of the reinforcing member may be set weak by forming the main body portion of the cross member with high-tensile steel (high-tensile steel plate) and forming the reinforcing member with a general steel plate, or The strength of the reinforcing member may be set relatively weak by reducing the thickness of the reinforcing member relative to the thickness of the main body portion of the cross member.
According to the above configuration, the buckling deformation suppressing function of the cross member can be improved by adjusting the relaxation margin of the rising of the impact load acting on the main body of the cross member.

In one embodiment of the present invention, a reinforcing portion for preventing buckling is formed on the inner side in the vehicle width direction of the main body portion of the cross member, and the inner end portion in the vehicle width direction of the reinforcing member is connected to the reinforcing portion. It is provided to overlap in the width direction.
The reinforcing part of the cross member described above may be configured by a bead having a convex shape downward or a convex shape upward.
According to the above configuration, the strength of the main body portion of the cross member is improved by the reinforcing portion, and the reinforcing portion and the reinforcing member are overlapped in the vehicle width direction, so that a load is applied to the inner end portion in the vehicle width direction of the reinforcing member. the body portion of the cross member concentrated on the Ru can be suppressed from buckling.

  According to this invention, the shock absorbing portion for reducing the impact at the time of a side collision is provided in the vicinity of the coupling end portion of the cross member with the side sill on the outer side in the vehicle width direction, and the outer side of the cross member main body portion in the vicinity of the outer end in the vehicle width direction. Since the reinforcing member is provided and the outer end portion in the vehicle width direction of the reinforcing member overlaps the impact absorbing portion in the vehicle width direction, the impact absorbing portion at the end of the cross member on the side sill side While absorbing the side impact load, the wrap structure of the reinforcing member with respect to the impact absorbing portion can alleviate the rise of the load acting on the main body portion of the cross member, thereby suppressing the buckling deformation of the cross member. There is an effect that the cross member can be reinforced with respect to the input from the side sill side (particularly, the side impact load input) by the reinforcing member.

Further, the impact absorbing portion is configured as a notched portion that is notched inward in the vehicle width direction in the vicinity of the coupling end portion of the cross member with the side sill. Thus, the impact absorbing portion is formed as a notched portion. Therefore, the moldability and workability of the impact absorbing portion can be ensured.

In addition, since the outer end portion in the vehicle width direction of the reinforcing member is provided to be separated from the side sill in the vehicle width direction, the crossing load can be reliably obtained while the impact absorbing portion absorbs the impact load. The buckling deformation of the member can be suppressed.

The schematic perspective view which shows the vehicle body structure provided with the vehicle body lower part structure of the vehicle of this invention The perspective view which shows the vehicle body lower part structure of a vehicle 2 is a cross-sectional view taken along line AA in FIG. Sectional view showing the interrelated structure between the cross member and nut plate Exploded perspective view of cross member and nut plate 3 is an enlarged view of the main part of FIG. Front view showing a reference example of the underbody structure of a vehicle

The impact absorbing portion at the end of the cross member on the side sill side absorbs the side impact load, and the rise of the load acting on the main body portion of the cross member is alleviated to suppress the buckling deformation of the cross member. In addition, the purpose of reinforcing the cross member against the input from the side sill side (especially side impact load input) by the reinforcing member is to be provided in the vehicle width direction between the tunnel portion at the top of the floor panel and the side sill. In the vehicle body lower part structure of the vehicle provided with the extending cross member, an impact absorbing portion for reducing the impact at the time of a side collision is provided in the vicinity of the coupling end portion with the side sill on the outer side in the vehicle width direction of the cross member, and the cross A reinforcing member is disposed in the vicinity of the outer end in the vehicle width direction of the main body of the member, and the outer end in the vehicle width direction of the reinforcing member overlaps the impact absorbing portion in the vehicle width direction. Provided, the shock absorbing portion is configured as a notch that is cut out in the vehicle width direction inside the coupling end vicinity of the side sill in the cross member, vehicle in the vehicle width direction outer end portion of the reinforcing member relative to the side sill This was realized by a configuration in which they were separated from each other in the width direction .

An embodiment of the present invention will be described in detail with reference to the drawings.
The drawing shows a lower body structure of a vehicle. In FIG. 1, a floor panel 1 that forms the bottom surface of a passenger compartment is provided. At the center of the floor panel 1 in the vehicle width direction, it projects into the passenger compartment and extends in the front-rear direction of the vehicle. The tunnel portion 2 (so-called floor tunnel) is formed integrally or integrally. This tunnel part 2 is the center of the vehicle body rigidity.

  A rear seat pan 3 is connected to the rear portion of the floor panel 1 described above, and a rear floor 4 that forms the bottom surface of the luggage compartment is integrally formed on the rear side of the rear seat pan 3 so that the rear portion of the rear floor 4 is formed. A spare tire pan 5 recessed downward is integrally formed in the middle in the vehicle width direction.

Further, side sills 6 as vehicle body rigid members extending in the front-rear direction of the vehicle are provided on both sides of the floor panel 1 in the vehicle width direction (however, only the right side is shown in the drawing).
As shown in FIGS. 2 and 3, the side sill 6 has a side sill inner section 7, a side sill reinforcement 8, and a side sill outer 9. It is a strength member.

A hinge pillar 11 extending upward from the front portion of the side sill 6 described above and a center pillar 12 extending upward from the middle portion in the front-rear direction of the side sill 6 are provided. Each of these pillars 11 and 12 are a vehicle body strength member for openably supporting the front door and the rear door (not shown).
The hinge pillar 11 includes a hinge pillar outer and a hinge pillar inner and is a vehicle body rigid member having a hinge pillar closed section extending in the vertical direction. The hinge pillar 11 is provided between the roof side rail 13 and the side sill 6. A hinge pillar reinforcement is provided between the hinge pillar outer and the hinge pillar inner as necessary.

The center pillar 12 includes a center pillar outer, a center pillar reinforcement, and a center pillar inner, and is a vehicle body rigid member having a center pillar closed section extending in the vertical direction. The roof side rail 13 and the side sill 6 are fixed upright.
Here, the space surrounded by the hinge pillar 11, the side sill 6, the center pillar 12, and the roof side rail 13 is set as the entrance / exit 14 (door opening) of the front seat occupant and the center pillar. 12, a space surrounded by the side sill 6, the quarter pillar 15, and the roof side rail 13 is set as a passenger entrance / exit 16 (door opening) of the rear seat occupant.

  A pair of left and right rear side frames 17 are provided on both sides of the rear seat pan 3 and the rear floor 4 in the vehicle width direction so as to be substantially continuous with the pair of left and right side sills 6 and 6 in the longitudinal direction of the vehicle.

Incidentally, a cross member 20 (so-called No. 2 cross member) extending in the vehicle width direction between the tunnel portion 2 at the top of the floor panel 1 and the side sill 6 corresponding to the entrance 14 of the front seat passenger. Is provided.
Further, a cross member 30 extending in the vehicle width direction is formed between the tunnel portion 2 at the top of the floor panel 1 and the side sill 6 so as to be spaced apart from the cross member 20 in the front-rear direction. (So-called No. 2.5 cross member) is provided.

Further, a rear cross member 40 (so-called No. 3 cross member) extending in the vehicle width direction is provided between the rear portion of the floor panel 1 and the front portion of the rear seat pan 3, and the rear portion of the rear seat pan 3 and the rear floor 4 are provided. A rear cross member 50 (so-called No. 4 cross member) extending in the vehicle width direction is provided between the front portion and the front portion.
The cross members 20 and 30 and the rear cross members 40 and 50 described above are vehicle body rigid members, and the cross members 20, 30, 40, and 50 are configured to improve the rigidity of the lower portion of the vehicle body. Yes.

On the other hand, as shown in FIGS. 2 and 3, a floor frame 18 is joined and fixed to the lower part of the floor panel 1, and extends between the lower surface of the floor panel 1 and the floor frame 18 in the front-rear direction of the vehicle. A closed section 19 is formed.
In this embodiment, the above-mentioned floor frame 18 has its front portion positioned in the middle of the side sill inner 7 and the vertical wall portion of the tunnel portion 2 in the vehicle width direction, and as the floor frame 18 goes rearward, the front side of the floor frame 18 moves outward in the vehicle width direction. It is arrange | positioned in planar view slant form so that it may be located in the direction.

  2 to 5, the cross member 20 includes an upper piece 20a, a front piece 20b, a joining flange piece 20c formed by bending forward from the lower end of the front piece 20b, and a rear piece 20d. (Refer to FIG. 4) and a joining flange piece 20e bent rearward from the lower end of the rear piece 20d form a main body portion 20A of the cross member 20, and an outer end portion of the main body portion 20A in the vehicle width direction. Are provided with joint flange pieces 20f, 20g, and 20h that are joined and fixed to the side sill inner 7. Further, a joint flange piece that is joined and fixed to the vertical wall of the tunnel portion 2 at the inner end in the vehicle width direction of the main body portion 20A. 20i, 20j, and 20k are provided.

  Here, the cross member 20 is formed by integrally forming the above-described pieces 20a to 20k, the main body portion 20A of the cross member 20 is formed in a cross-sectional hat shape, and the joining flange pieces 20c and 20e below the floor member 1 A closed cross section 21 (see FIG. 4) extending in the vehicle width direction is formed between the floor panel 1 and the cross member 20.

  Further, a bead 22 as a reinforcing portion for preventing buckling of the cross member 20 is formed on the inner side in the vehicle width direction of the main body portion 20A of the cross member 20. As shown in FIGS. 2 and 4, the bead 22 is a reinforcing portion that is recessed downward from the upper piece 20 a of the cross member 20 and extends in the vehicle width direction. Of course, the beads may be provided.

Moreover, as shown in FIGS. 3, 4, and 6, in the vicinity of the coupling end portion of the cross member 20 with the side sill 6 on the outer side in the vehicle width direction, as an impact absorbing portion that reduces the impact at the time of side collision. A notch 23 is provided.
As shown in FIGS. 5 and 6, the notch 23 is a fragile part that is notched inward in the vehicle width direction in the vicinity of the coupling end of the cross member 20 with the side sill inner 7. The front ridge line X between the upper piece 20a and the front piece 20b and the ridge line Y on the rear side between the upper piece 20a and the rear piece 20d are arranged in the vicinity of the connecting end with the side sill inner 7. It is constructed by cutting out inward.
Thus, it is possible to provide an appropriate shock absorbing portion by notching the ridge lines X and Y having high strength and providing the notches 23 at the front and rear.

Further, as shown in FIGS. 3 and 4, a nut plate 24 as a reinforcing member is disposed in the vicinity of the outer side in the vehicle width direction of the main body 20A of the cross member 20 as shown in FIGS. Further, an outer end 24a in the vehicle width direction of the nut plate 24 is provided so as to overlap with the above-described notch 23 in the vehicle width direction.
Here, the vehicle width direction outer side end portion 24a of the nut plate 24 as the reinforcing member is provided to be separated from the side sill inner 7 in the vehicle width direction inner side as shown in an enlarged view in FIG.

  Further, as shown in a perspective view of FIG. 5, the nut plate 24 described above is spot-welded to the lower surface of the upper piece 20a of the cross member 20, and concave portions with respect to the joints 24c and 24d. The substantially horizontal upper piece 24e, the front piece 24f, and the rear piece 24g that are provided are integrally formed. The front piece 24f of the nut plate 24 is a front piece of the cross member 20 in the closed section 21. The nut plate 24 has a rear piece 24g joined and fixed to the rear piece 20d of the cross member 20 in the closed section 21.

  Further, the upper piece 24e of the nut plate 24 described above is provided with a nut support member 26 in which openings 24h and 24i are formed as shown in FIGS. An inverted L-shaped locking piece 26 a is integrally formed with the nut support member 26.

The nut 25 is disposed in the opening 24h of the nut plate 24, and the engaging piece 26a is engaged in the opening 24i of the nut plate 24 to absorb manufacturing errors when the seat is attached. The nut support member 26 is configured such that it can be finely adjusted in the front-rear and left-right directions with the nut 25 provided.
The nut plate 24 is a seat mounting member for fixing an unillustrated passenger seat (front seat) to the cross member 20, and the nut plate 24 is provided between the cross member 20 and the floor panel 1. It is a plate that is provided in the closed section 21 (see FIG. 4) and uses the dead space to hold the occupant seat fixing nut 25.

Here, a bolt insertion hole 27 is formed in the upper piece 20a of the cross member 20 facing the nut 25 in the nut plate 24 in the vertical direction.
Moreover, the strength of the nut plate 24 as the reinforcing member and the seat mounting member is set to be weaker than the strength of the main body portion 20A of the cross member 20 described above.

  In this embodiment, the cross member 20 is formed of high-tensile steel (high-tensile steel plate), while the nut plate 24 is formed of a general steel plate so that the strength of the nut plate 24 is greater than the strength of the cross member 20. Although it is configured to be weak, instead of a configuration in which the strength is weakened due to the difference in the material, the plate thickness of the cross member 20 is set to be thicker than the plate thickness of the nut plate 24, and both 20, 24 are made of the same material. A configuration in which the strength of the nut plate 24 is relatively weakened may be adopted.

Further, as shown in FIG. 4, the inner end 24b in the vehicle width direction of the nut plate 24 is provided so as to overlap the bead 22 of the cross member 20 by a distance L1 in the vehicle width direction. Due to the structure, the main body portion 20A of the cross member 20 is configured to be prevented from buckling.
In the figure, arrow F indicates the front of the vehicle, arrow OUT indicates the outside of the vehicle, and arrow UP indicates the upper side of the vehicle.

The operation of the vehicle body lower structure thus configured will be described.
Since a notch portion 23 as an impact absorbing portion is provided in the vicinity of the coupling end portion of the cross member 20 with the side sill inner 7 on the outer side in the vehicle width direction, the impact load is applied via the side sill 6 at the side collision of the vehicle. When input to the cross member 20, an impact load can be absorbed by the notch 23.

When the nut plate 24 is not provided near the outer end in the vehicle width direction of the main body portion 20A of the cross member 20, the load acting on the main body portion 20A of the cross member 20 when the notch portion 23 is completely crushed. In this embodiment, a nut plate 24 is provided in the vicinity of the outer end in the vehicle width direction of the main body 20A of the cross member 20 so as to overlap the notch 23, and this nut plate Since the strength of 24 is set so as to be smaller than the strength of the main body portion 20A of the cross member 20, the rising of the load acting on the main body portion 20A of the cross member 20 can be reduced.
As a result, the cross member 20 can be prevented from being deformed such that the middle of the cross member 20 in the vehicle width direction is buckled downward, and the cross member 20 is bent in a substantially V shape when viewed from the front. Appropriate impact load can be received.

  1 to 6, the vehicle body lower part structure of the vehicle is provided with the cross member 20 extending in the vehicle width direction between the tunnel part 2 on the floor panel 1 and the side sill 6. The vehicle body lower part structure of the vehicle is provided with an impact absorbing portion (see the notch portion 23) for reducing the impact at the time of a side collision in the vicinity of the coupling end portion with the side sill 6 on the outer side in the vehicle width direction of the cross member 20. In addition, a reinforcing member (see the nut plate 24) is disposed near the outer end in the vehicle width direction of the main body 20A of the cross member 20, and the outer end 24a in the vehicle width direction of the reinforcing member (see the nut plate 24) It is provided so as to overlap in the vehicle width direction with respect to the impact absorbing portion (see the cutout portion 23) (see FIGS. 1 and 4).

  According to this configuration, the impact absorbing portion (see the notch portion 23) at the end of the cross member 20 on the side sill 6 side can absorb the side impact load, and the impact absorbing portion (see the notch portion 23) and the reinforcement are provided. Due to the overlapping structure of both of the members (see the nut plate 24), the rising of the load acting on the main body portion 20A of the cross member 20 is alleviated, and the buckling deformation of the cross member 20 (the cross member 20 in the vehicle width direction) (Deformation in which the middle buckles downward and bends) can be suppressed, and the cross member 20 can be reinforced against the input from the side sill 6 by the reinforcing member (see the nut plate 24). .

Further, the shock absorbing portion is configured as a cutout portion 23 cut out inward in the vehicle width direction in the vicinity of the coupling end portion of the cross member 20 with the side sill 6 (see FIG. 6).
According to this configuration, since the form of the shock absorbing portion and the notch 23, the moldability of the shock absorbing unit (see notch 23), after securing the workability, the upper climate results are obtained.

Further, the reinforcing member (see the nut plate 24) is composed of a seat mounting member for fixing the passenger seat to the cross member 20 (see FIG. 4).
According to this configuration, by using a sheet attachment member (see nutplate 24), it can be obtained on the climate fruit.

In addition, the seat mounting member is a nut plate 24 that is provided in a closed section 21 between the cross member 20 and the floor panel 1 and holds a nut 25 for fixing a passenger seat ( (See FIG. 4).
According to this configuration, it is possible to effectively utilize the nut plate 24 provided in closed section 21 of the cross member 20 serving as a dead space, ensuring the upper climate fruit.

Moreover, the strength of the reinforcing member (see the nut plate 24) is set to be weaker than the strength of the main body 20A of the cross member 20 (see FIG. 4).
According to this configuration, it is possible to improve the buckling deformation suppressing function of the cross member 20 by adjusting the relaxation margin of the rising of the impact load acting on the main body portion 20A of the cross member 20.

Further, a buckling prevention reinforcing portion (see bead 22) is formed on the inner side in the vehicle width direction of the main body portion 20A of the cross member 20, and an inner end portion 24b in the vehicle width direction of the reinforcing member (see the nut plate 24) is formed. The reinforcing portion (see bead 22) is provided so as to overlap in the vehicle width direction (see FIG. 4).
According to this configuration, the strength of the main body portion 20A of the cross member 20 is improved by the reinforcing portion (see the bead 22), and the reinforcing portion (see the bead 22) and the reinforcing member (see the nut plate 24) are arranged in the vehicle width direction. Since they are overlapped, it is possible to suppress the load from concentrating on the inner end 24b in the vehicle width direction of the reinforcing member (see the nut plate 24) and buckling the main body 20A of the cross member 20.

Further, the vehicle width direction outer end 24a of the reinforcing member (see the nut plate 24) is provided to be separated from the side sill 6 (specifically, the side sill inner 7) inward in the vehicle width direction (FIG. 6). reference).
According to this configuration, the buckling deformation of the cross member 20 can be suppressed while the effect of absorbing the side impact load by the impact absorbing portion (see the notch portion 23) is reliably obtained.

The above embodiment is also a vehicle lower body structure in which a cross member 20 extending in the vehicle width direction is provided between the tunnel portion 2 on the floor panel 1 and the side sill 6. An impact absorbing portion (see the notch portion 23) for reducing the impact at the time of a side collision is provided in the vicinity of the coupling end portion with the side sill 6 on the outer side in the width direction, and the impact absorbing portion (see the notch portion 23) and the vehicle width direction are provided. And a load relaxation means (see the nut plate 24) that relaxes the rise of the load just before the shock absorbing portion (see the notch 23) completes the shock absorption.
According to this configuration, the side impact load can be absorbed by the notch portion 23, and the nut plate 24 as a load mitigating means alleviates the rise of the load just before the shock absorption of the notch portion 23 is completed.
As a result, there is an effect that the buckling deformation of the cross member 20 can be suppressed.

FIG. 7 shows a reference example of the vehicle body lower structure of the vehicle. In the previous embodiment, the notch portion 23 was provided as the shock absorbing portion. In this reference example shown in FIG. 7, the opening portion 28 was provided as the shock absorbing portion. It is a thing.
That is, an opening 28 (fragile portion) as an impact absorbing portion for reducing the impact at the time of a side collision is provided in the vicinity of the coupling end portion with the side sill 6 (specifically, the side sill inner 7) on the outer side in the vehicle width direction of the cross member 20. It is provided.

The reference example shown in FIG. 7 also has a vehicle body lower structure in which a cross member 20 extending in the vehicle width direction is provided between the tunnel portion 2 at the top of the floor panel 1 and the side sill 6. 20 is provided in the vicinity of the coupling end portion with the side sill 6 on the outer side in the vehicle width direction of the vehicle 20, and an impact absorbing portion (refer to the opening portion 28) for reducing the impact at the time of a side collision is provided. A reinforcing member (see the nut plate 24) is disposed in the vicinity of the outer end, and the outer end 24a in the vehicle width direction of the reinforcing member (see the nut plate 24) is set to the vehicle width with respect to the impact absorbing portion (see the opening 28). It overlaps in the direction (see FIG. 7).

  According to this configuration, the impact absorbing portion (see the opening portion 28) at the end of the cross member 20 on the side sill 6 side can absorb the side impact load, and the impact absorbing portion (see the opening portion 28) and the reinforcing member can be reinforced. Due to the overlapping structure of both of the members (see the nut plate 24), the rising of the load acting on the main body portion 20A of the cross member 20 is alleviated, and the buckling deformation of the cross member 20 (the cross member 20 in the vehicle width direction) (Deformation in which the middle buckles downward and bends) can be suppressed, and the cross member 20 can be reinforced against the input from the side sill 6 by the reinforcing member (see the nut plate 24). .

In this reference example shown in FIG. 7 as well, other configurations, operations, and effects are the same as those in the previous embodiment. Therefore, in FIG. Although description is omitted, in any of the above-described embodiments and reference examples , the impact energy absorption amount can be arbitrarily set by setting the size of the notch 23 or the opening 28.

In the correspondence between the configuration of the present invention and the above-described embodiment,
Shock absorber of the invention corresponds to the notch 2 3 embodiment,
Similarly,
The reinforcing member (sheet mounting member) and the load relaxation means correspond to the nut plate 24,
The reinforcement part formed in the main body part of the cross member corresponds to the bead 22,
The present invention is not limited to the configuration of the above-described embodiment.
For example, the formation position of the notch 23 is another position that overlaps the nut plate 24 in the upper piece 20a, front piece 20b, and rear piece 20d of the cross member 20 other than the ridgelines X and Y having high strength. also not good.

DESCRIPTION OF SYMBOLS 1 ... Floor panel 2 ... Tunnel part 6 ... Side sill 20 ... Cross member 20A ... Main-body part 21 ... Closed section 22 ... Bead (reinforcement part)
23 ... Notch (shock absorbing part)
24 ... nut plate (reinforcing member sheet attachment member)
25 ... nuts

Claims (5)

A vehicle body lower structure in which a cross member extending in a vehicle width direction is provided between a tunnel portion at an upper portion of a floor panel and a side sill,
In the vicinity of the coupling end with the side sill on the outer side of the cross member in the vehicle width direction, there is provided an impact absorbing portion for reducing the impact at the time of a side collision,
A reinforcing member is disposed in the vicinity of the outer end in the vehicle width direction of the main body of the cross member,
An outer end portion in the vehicle width direction of the reinforcing member is provided so as to overlap the impact absorbing portion in the vehicle width direction ,
The impact absorbing portion is configured as a notched portion that is notched inward in the vehicle width direction in the vicinity of the coupling end portion with the side sill in the cross member,
The vehicle body lower part structure of a vehicle, wherein an outer end portion in the vehicle width direction of the reinforcing member is provided to be spaced inward in the vehicle width direction with respect to the side sill . The vehicle body lower part structure according to claim 1 , wherein the reinforcing member is a seat mounting member for fixing an occupant seat to the cross member . The vehicle body according to claim 2 , wherein the seat mounting member is a nut plate that is provided in a closed section between the cross member and the floor panel and holds a nut for fixing a passenger seat. Substructure. The vehicle body lower part structure according to any one of claims 1 to 3 , wherein a strength of the reinforcing member is set to be weaker than a strength of a main body portion of the cross member . A reinforcing part for buckling prevention is formed on the inner side in the vehicle width direction of the main body part of the cross member,
Underbody structure of a vehicle according to any one of <br/> claims 1-4 provided in overlap in the vehicle width direction with respect to the vehicle width direction inside end portion reinforcing portion of the reinforcing member .

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