JPH10297541A - Rear body structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely bear an input load even upon lateral collision in addition to rear collision. SOLUTION: A reinforcing panel 38 is arranged in the closed section part 36 of a center floor cross member 30, being extended in a prolonging direction of a vehicle-widthwise inner wall part 22A of the front end part 22 of a rear floor side member 20. The reinforcing panel 38 connects a cross point part P between the inner part 22A of the front end part 22 of the rear floor side member 20 and a vehicle rear side wall part 34A of a center floor cross-member rear panel 34, to a rocker inner panel 16, thereby it is possible to restrain the vehicle rear side wall part 34 from being deformed in the vehicle widthwise inward direction, upon lateral collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear underbody structure for a vehicle, and more particularly to a rear underbody structure for a vehicle that connects a rear portion of a rocker and a front portion of a rear floor side member.

[0002]

2. Description of the Related Art Conventionally, as an example of a rear underbody structure of a vehicle in which a rear portion of a rocker is connected to a front portion of a rear floor side member, a structure disclosed in Japanese Patent Application Laid-Open No. 4-43176 is known.

As shown in FIG. 6, in the rear underbody structure of this vehicle, a rocker outer panel 100 and a rocker inner panel 102 form a rear portion 106A of a rocker 106 in which a rocker closed cross section 104 extending in the vehicle front-rear direction is formed.
The front end portion 108A of the rear floor side member 108 which is curved outward in the vehicle width direction is connected to the inside portion in the vehicle width direction. In addition, the connecting portion between the rear portion 106A of the rocker 106 and the front end portion 108A of the rear floor side member 108 includes:
The vehicle width direction end 110A of the center floor cross member 110 arranged along the vehicle width direction is connected. As a result, in the rear underbody structure of this vehicle,
That is, even when another vehicle collides from behind and a large load acts on the rear floor side member 108 from behind, deformation at the curved portion of the front portion 108A of the rear floor side member 108 is prevented, and the input load at the time of a rear collision is reduced. It can be supported reliably.

[0004]

However, in the rear underbody structure of this vehicle, the end of the center rear cross member 110 in the vehicle width direction of the rear wall 110B of the vehicle is formed by the inner wall 108 of the rear floor side member 108 in the vehicle width direction.
It is cut at the intersection P with B. Therefore, at the time of side collision,
That is, when another vehicle collides from the side with the rear portion 106A of the rocker 106, the vehicle rear side wall portion 110B of the center floor cross member 110 is easily deformed inward of the vehicle rear side (the direction of the arrow W in FIG. 6). Therefore, a structure that suppresses this deformation and reliably supports the load is required.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a vehicle rear underbody structure capable of reliably supporting an input load even in a side collision in addition to a rear collision.

[0006]

According to a first aspect of the present invention, there is provided a rocker disposed at both ends in a vehicle width direction of a vehicle floor along a vehicle front-rear direction, and an offset inside the vehicle with respect to the rocker. And a center side cross member disposed along the vehicle width direction at an intermediate portion of the vehicle floor in the vehicle front-rear direction, the rear side member having a front end curved toward the rocker. Wherein the vehicle width direction inner wall portion of the rear side member and the vehicle rear wall portion of the center floor cross member cross each other, and the vehicle width direction inner wall portion is cut by the crossing portion. And a reinforcing panel for connecting the crossing portion and the rocker is provided in one of the extending directions of the rear wall portion and the vehicle.

[0007] Therefore, the reinforcing panel connecting the crossing portion and the rocker, which is provided in the extending direction of one of the inner wall portion in the vehicle width direction of the rear side member and the vehicle rear side wall portion of the center floor cross member, is provided. At the time of collision, the vehicle rear side wall portion of the center floor cross member is prevented from being deformed inward on the vehicle rear side, and the load acting on the rocker can be reliably supported. Also, at the time of a rear collision, a reinforcing panel
Since the load can be reliably transmitted from the rear side member to the rocker and the center floor cross member,
Even in the event of a side collision, the input load can be reliably supported.

According to a second aspect of the present invention, there is provided a rocker disposed at both ends in the vehicle width direction of the vehicle floor along the vehicle front-rear direction, and disposed offset to the inside of the vehicle with respect to the rocker. A rear side member having a front end curved toward the rocker, a center floor cross member having a closed cross-section disposed at a middle portion of the vehicle floor in the vehicle front-rear direction along the vehicle width direction, and a vehicle of the rocker A floor under reinforcement that is arranged along the vehicle front-rear direction on the inside in the width direction, and a rear under body structure of the vehicle including:
A vehicle width direction inner wall portion of the rear side member intersects a vehicle rear wall portion of the center floor cross member, and the cross portion and the floor under reinforcement are connected within a closed cross section of the center floor cross member. The reinforcing member is provided.

Therefore, an intersection between the inner wall portion in the vehicle width direction of the rear side member and the vehicle rear wall portion of the center floor cross member, provided in the cross section of the center floor cross member,
By the reinforcing member connecting the floor under reinforcement, the vehicle rear side wall portion of the center floor cross member is prevented from being deformed inward on the vehicle rear side, and the load acting on the rocker can be reliably supported. Also, at the time of a rear collision, since the load can be transmitted from the rear side member to the floor under reinforcement,
Even in the event of a side collision, the input load can be reliably supported.

Furthermore, since the rear side member and the floor under reinforcement are connected by the reinforcing member, the resonance frequency of the vertical bending vibration of the body can be reduced, so that the body noise is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a rear underbody structure for a vehicle according to the present invention will be described with reference to FIGS.

In the drawings, an arrow FR indicates a vehicle forward direction, an arrow UP indicates a vehicle upward direction, and an arrow IN indicates a vehicle width inside direction.

As shown in FIG. 1, a vehicle 1 according to this embodiment is shown.
In the rear underbody structure of No. 0, a pair of left and right rockers 12 are disposed along the vehicle front-rear direction at both ends in the vehicle width direction below the vehicle compartment (the rockers on the left side of the vehicle are not shown).

The rocker 12 includes a rocker outer panel 14 that forms an outer portion of the rocker 12 in the vehicle width direction, and a rocker inner panel 16 that forms an inner portion of the rocker 12 in the vehicle width direction. The rocker outer panel 14 has an upper portion bent in a stepped shape, and a downwardly extending portion bent in a curved shape so that the cross-sectional shape viewed from the vehicle front-rear direction has a C-shape with the opening directed inward in the vehicle width. Have been. An upper flange 14A and a lower flange 14B are formed at the opening end of the rocker outer panel 14 in a direction away from each other.

On the other hand, the cross section of the rocker inner 16 as viewed from the front-rear direction of the vehicle is formed in a substantially U-shape with the opening directed outward in the vehicle width. An upper flange 16A and a lower flange 16B are formed at the open end of the rocker inner panel 16 in a direction away from each other. The upper flange 16A and the lower flange 16B are welded to the upper flange 14A and the lower flange 14B of the rocker outer panel 14, respectively, and the rocker 12 has a closed sectional structure.
A U-shaped flange 16 </ b> C (see FIG. 2) connecting the upper flange 16 </ b> A and the lower flange 16 </ b> B is formed at the vehicle rear end of the rocker inner panel 16, and this flange 16 </ b> C is a front part of the wheel house inner 18. Is welded to.

A rear floor side member 20 is disposed along the vehicle front-rear direction with the rocker 12 being offset from the inside of the vehicle, and the front end 22 of the rear floor side member 20 is bent at the wheel house inner 18. It is curved toward the rocker 12 along the plane. The front end portion 22 of the rear floor side member 20 has a U-shaped cross section as viewed from the vehicle front-rear direction with the opening directed upward, and the upper end portion of the vehicle width direction inner side wall portion 22A has an inner side in the vehicle width direction. A bent flange 22B is formed, and the flange 22B is welded to the lower surface of the center floor panel 24. Also, at the front end of the vehicle width direction inner wall portion 22A,
A flange 22C bent inward in the vehicle width direction is formed.

The front end 22 of the rear floor side member 20
The upper edge 22E of the vehicle width direction outer wall portion 22D is welded to the wheel house inner 18 with a part of the flange 16C of the rocker inner panel 16 interposed therebetween, and the upper edge 22E has a center floor panel. A flange 24A formed upward is welded to an outer edge of the vehicle 24 in the vehicle width direction.

The front edge 22F of the outer wall portion 22D in the vehicle width direction of the rear floor side member 20 is welded to the wheel house inner member 18 with a part of the flange 16C of the rocker inner panel 16 interposed therebetween.

A front floor panel 26 is stretched between the left and right rockers 12, and a flange 26A formed upward on an outer edge of the front floor panel 26 in the vehicle width direction is formed with a rocker inner panel 16. Vertical wall part 1
It is welded to the lower edge of 6C.

A center floor cross member 30 is disposed between the left and right rockers 12 along the vehicle width direction. The center floor cross member 30 forms a vehicle front side of the center floor cross member 30. The vehicle includes a center floor cross member front panel 32 and a center floor cross member rear panel 34 that forms a rear portion of the center floor cross member 30 on the vehicle.

The cross-sectional shape of the center floor cross member front panel 32 viewed from the vehicle width direction is the vehicle front side wall portion 32.
A and an upper wall portion 32B extending rearward from the upper end of the vehicle front side wall portion 32A. The vehicle front side wall portion 32A has a lower end formed with a front flange 32C.
Are formed.

On the other hand, the sectional shape of the center floor cross member rear panel 34 as viewed from the vehicle width direction is the rear wall portion 3 of the vehicle.
4A and a lower wall portion 34B extending forward from the lower end of the vehicle rear side wall portion 34A. The vehicle rear side wall portion 34A has an upper end formed with a rearward flange 34C.
Are formed.

The flange 32C of the center floor cross member front panel 32 is welded to the front end edge 34D of the lower wall 34B of the center floor cross member rear panel 34. The rear edge 26B is welded. Also, the flange 34C of the center floor cross member rear panel 34
Are welded to the rear end edge 32D of the upper wall 32B of the center floor cross member front panel 32, and the front end edge 2 of the center floor panel 24 is
4B is welded.

Therefore, the center floor cross member 30
Defines a closed cross section 36 extending in the vehicle width direction by the center floor cross member front panel 32 and the center floor cross member rear panel 34.

A flange 32E is formed forward on the vehicle width direction outer end of the vehicle front side wall portion 32A of the center floor cross member front panel 32. The flange 32E is connected to the vertical wall portion of the rocker inner panel 16. 16E. The outer edge 32 of the upper wall portion 32B of the center floor cross member front panel 32 in the vehicle width direction is also provided.
F is welded to the inner edge in the vehicle width direction of the upper wall 16F of the rocker inner panel 16.

The center floor cross member 30 has both ends in the vehicle width direction bulging rearward in the vehicle, and the outer portion in the vehicle width direction of the vehicle rear side wall portion 34A of the center floor cross member rear panel 34 is bent rearward in the vehicle. . A flange 34E is formed rearward at the outer end in the vehicle width direction of the vehicle rear side wall portion 34A of the center floor cross member rear panel 34, and this flange 34E is welded to the vertical wall portion 16E of the rocker inner panel 16. ing.

As shown in FIG. 3, a reinforcing panel 38 is disposed in the closed cross section 36 of the center floor cross member 30, and the reinforcing panel 38 is provided at the front end 22 of the rear floor side member 20. It is arranged in the extension direction of the width direction inner wall portion 22A. At the front end of the reinforcing panel 38, a flange 38A is formed toward the front,
The flange 38A is connected to the flange 32E of the center floor cross member front panel 32 and the rocker inner panel 1.
6 is welded to the vertical wall portion 16E. A flange 38B is formed at the rear end of the reinforcing panel 38 toward the diagonally rearward outside. The flange 38B is welded to the vehicle rear side wall 34A of the center floor cross member rear panel 34. Therefore, the reinforcing panel 38 is provided between the front end portion 22A of the rear floor side member 20 and the inner wall portion 22A in the vehicle width direction and the center floor cross member rear panel 3
4 and the rocker inner panel 16 is connected to the intersection P of the vehicle rear side wall portion 34A.

As shown in FIG. 1, a flange 38C is formed rearward at the upper end of the reinforcing panel 38, and this flange 38C is welded to the upper wall 32B of the center floor cross member front panel 32. ing. A flange 38D is formed rearward at the lower end of the reinforcing panel 38, and the flange 38D is welded to the lower wall 34B of the center floor cross member rear panel 34.

A floor under reinforcement 40 is arranged inside the rocker 12 in the vehicle width direction along the vehicle front-rear direction. The cross-sectional shape of the floor under reinforcement 40 as viewed from the vehicle front-rear direction is a U-shape with an opening facing upward, and flanges 40A and 40B are formed at the opening ends. These flanges 40A, 40B are connected to the front floor panel 26.
The floor under reinforcement 40 and the front floor panel 26 form a closed section 42 extending in the vehicle front-rear direction. At the rear end of the floor under reinforcement 40, a vertical wall portion 40C is formed, and the vertical wall portion 40C is formed on the vehicle rear side wall portion 3 of the center floor cross member rear panel 34.
4A is welded to the rear surface.

As shown in FIG. 3, a reinforcing member 44 is disposed in the closed cross section 36 of the center floor cross member 30, and the reinforcing member 44 is provided at the rear end of the floor under reinforcement 40. It is arranged above.
The cross-sectional shape of the reinforcing member 44 as viewed from above is a trapezoidal shape that opens rearward, and the front wall portion 44A is formed of the vehicle front side wall portion 3 of the center floor cross member front panel 32.
It is welded to 2A.

A flange 44C is formed at the rear end of the outer wall portion 44B of the reinforcing member 44 in the vehicle width direction toward the outside rear of the vehicle.
Is welded between the flange 38B of the center floor member 34A and the rear wall portion 34A of the rear panel 34 of the center floor cross member.
At the rear end of the vehicle width direction inner side wall 44D of the reinforcing member 44,
A flange 44E is formed inward of the vehicle width, and the flange 44E is welded to the vehicle rear side wall portion 34A of the center floor cross member rear panel 34.

As shown in FIG. 2, a flange 44F is formed at the lower end of the outer wall 44B in the vehicle width direction of the reinforcing member 44 so as to extend outward from the vehicle width.
Are welded to the lower wall portion 34B of the center floor cross member rear panel 34. Further, a flange 44G is formed inward of the vehicle width at a lower end portion of the inner wall portion 44D in the vehicle width direction of the reinforcing member 44.
Lower wall portion 34 of center floor cross member rear panel 34
B is welded. The outer edge 34F in the vehicle width direction of the lower wall 34B of the center floor cross member rear panel 34 is
The front end 22H of the lower end 22G of the front end 22 of the rear floor side member 20 is welded to the lower end of the lower wall 16G of the center floor cross member rear panel 34. Is welded to the lower surface of the lower wall portion 16G of the rocker inner panel 16.

In front of the front wall portion 44A of the reinforcing member 44,
An L-shaped under reinforcement member 48 is provided with the vehicle front side wall portion 32A of the center floor cross member front panel 32 interposed therebetween.

As shown in FIG. 3, the cross-sectional shape of the under reinforcement member 48 when viewed from above the upper portion 50 is a U-shape with the opening directed rearward.
Flange 50 formed at the opening end toward the outside of the opening
A and 50B are welded to the front wall portion 44A of the reinforcing member 44 with the vehicle front side wall portion 32A of the center floor cross member front panel 32 interposed therebetween.

As shown in FIG. 1, the cross-sectional shape of the lower portion 52 of the under reinforcement member 48 when viewed from the front has a U-shape with the opening directed downward, and the opening end has the outside of the opening. 52A formed toward the
52B are flanges 40A, 40 of the floor under reinforcement 40 with the front floor panel 26 interposed therebetween.
B, respectively.

Next, the operation of the present embodiment will be described. In the present embodiment, when a load is applied from behind the vehicle at the time of a rear collision, the load is first input to the rear floor side member 20. The input load is transmitted to the front of the vehicle along the rear floor side member 20 and transmitted to the rocker inner panel 16 by the curved front end 22. Here, the reinforcing panel 38 is provided in the direction in which the front end portion 22 of the rear floor side member 20 extends in the vehicle width direction inner side wall portion 22A, and the front end portion 22 of the rear floor side member 20 is provided.
Of the vehicle width direction inner wall portion 22A, the intersection P of the center floor cross member rear panel 34 with the vehicle rear side wall portion 34A, and the rocker inner panel 16 are connected to each other. The transmission can be reliably transmitted from the member 20 to the rocker inner panel 16 and the center floor cross member front panel 32.

On the other hand, as shown in FIG. 4, when a load F acts on the rear portion of the rocker 12 from the outside in the vehicle width direction at the time of a side collision,
The outer portion in the vehicle width direction of the vehicle rear side wall portion 34A of the center floor cross member rear panel 34 tends to be deformed inward in the vehicle width direction (in the direction of the arrow A in FIG. 4), but this deformation is suppressed by the pulling force of the reinforcing panel 38. can do.
Thus, the load acting on the vehicle rear side wall portion 34A of the center floor cross member rear panel 34 at the time of a side collision can be reliably supported, and the load is applied via the reinforcing panel 38 to the vehicle width direction inner side wall of the rear floor side member 20. Part 2
2A can be transmitted efficiently.

Therefore, in the rear underbody structure of the vehicle according to the present embodiment, the input load can be reliably supported not only at the time of a rear collision but also at the time of a side collision.

In the rear underbody structure of the vehicle according to the present embodiment, the vehicle width direction outer wall portion 44 of the reinforcing member 44 provided in the closed section 36 of the center floor cross member 30 is provided.
Also according to B, it is possible to prevent the outer side portion in the vehicle width direction of the vehicle rear side wall portion 34A from being deformed inward in the vehicle width direction rearward (in the direction of arrow A in FIG. 4) at the time of a side collision. Further, at the time of a rear collision, the load acting on the vehicle width direction inner side wall portion 22A of the front end portion 22 of the rear floor side member 20 is efficiently transmitted to the floor under reinforcement 40 by the vehicle width direction outer wall portion 44B of the reinforcing member 44. can do. Further, the reinforcing member 44 can prevent the center floor cross member 30 from collapsing in cross section.

Further, since the reinforcing member 44 connects the inner wall portion 22A in the vehicle width direction of the front end portion 22 of the rear floor side member 20 and the floor under reinforcement 40, the resonance frequency of the vertical bending vibration of the body can be reduced. Therefore, body noise can be reduced.

In the rear underbody structure of the vehicle according to this embodiment, the under reinforcement member 48 is provided.
Is provided, the input load at the time of a rear collision and a side collision can be more reliably supported, and the input load at the time of a front collision can also be reliably supported.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the present embodiment, the reinforcing panel 38 disposed in the direction of extension of the vehicle width direction inner wall portion 22A of the front end portion 22 of the rear floor side member 20 allows the vehicle width direction inner wall surface of the front end portion 22 of the rear floor side member 20 to be extended. Part 22A
And the intersection P of the center floor cross member rear panel 34 with the vehicle rear side wall 34A and the rocker inner panel 16 are connected. Instead, as shown in FIG. Rear wall 3
By the reinforcing panel 60 arranged in the extension direction of 4A,
A configuration may be adopted in which an intersection P between the vehicle width direction inner side wall portion 22A of the front end portion 22 of the rear floor side member 20, the vehicle rear side wall portion 34A of the center floor cross member rear panel 34, and the rocker inner panel 16 is connected. Further, in the present embodiment, the reinforcing member 44 and the under reinforcement reinforcing member 48 are provided. However, instead of this, only the reinforcing panel 38 may be provided. A configuration in which the reinforcement member 48 is provided may be employed. Also, the reinforcing member 4
4 may have a shape excluding the vehicle width direction inner wall portion 44D, the flange 44E, and the flange 44G. Further, the sectional shape of the rocker 12, the sectional shape of the rear floor side member 20, and the sectional shape of the center floor cross member 30 are as follows.
The sectional shape is not limited to the sectional shape of the present embodiment, and may be another sectional shape.

[0043]

According to the first aspect of the present invention, a rocker is provided at both ends in the vehicle width direction of the vehicle floor along the vehicle front-rear direction, and the rocker is disposed offset from the rocker to the inside of the vehicle. A rear underbody structure for a vehicle comprising: a rear side member having a front end curved toward a rocker; and a center floor cross member disposed along the vehicle width direction at an intermediate portion of the vehicle floor in the vehicle longitudinal direction. Then, the vehicle width direction inner wall portion of the rear side member intersects the vehicle rear wall portion of the center floor cross member, and the vehicle width direction inner wall portion cut by the intersection portion and the vehicle rear wall portion are formed. Since the reinforcing panel that connects the crossing portion and the rocker is provided in one extension direction, an excellent effect that the input load can be reliably supported not only at the time of a rear collision but also at the time of a side collision.

According to a second aspect of the present invention, there is provided a rocker disposed at both ends in the vehicle width direction of the vehicle floor along the vehicle front-rear direction, and a front end provided at a position offset from the rocker to the inside of the vehicle. A rear side member whose section is curved toward the rocker, a center floor cross member that is disposed along the vehicle width direction at an intermediate portion of the vehicle floor in the vehicle front-rear direction and has a closed cross-sectional structure, and an inner side in the vehicle width direction of the rocker. And a floor under reinforcement disposed along the vehicle front-rear direction at the rear underbody structure of the vehicle, wherein a vehicle width direction inner side wall portion of the rear side member and a vehicle rear side wall portion of the center floor cross member are provided. In the closed section of the center floor cross member, a reinforcing member that connects the intersection and the floor under reinforcement is provided. With the force load can be reliably supported, it has an excellent effect of reducing the body noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rear underbody structure of a vehicle according to an embodiment of the present invention, as viewed from an obliquely front inner side of the vehicle.

FIG. 2 is an exploded perspective view showing the rear underbody structure of the vehicle according to the embodiment of the present invention, as viewed obliquely from the front inside the vehicle.

FIG. 3 is a schematic plan sectional view showing a rear underbody structure of the vehicle according to one embodiment of the present invention.

FIG. 4 is an operation explanatory view of a rear underbody structure of the vehicle according to one embodiment of the present invention.

FIG. 5 is a schematic plan sectional view showing a rear underbody structure of a vehicle according to a modification of one embodiment of the present invention.

FIG. 6 is a perspective view showing a rear underbody structure of a vehicle according to a conventional embodiment, as viewed obliquely from the front inside the vehicle.

[Explanation of symbols]

12 Rocker 14 Rocker Outer Panel 16 Rocker Inner Panel 20 Rear Floor Side Member 22 Front End of Rear Floor Side Member 22A Inner Side Wall Part of Front End of Rear Floor Side Member 30 Center Floor Cross Member 32 Center Floor Cross Member Front Panel 34 Center Floor Cross Member rear panel 34A Center rear cross member rear panel vehicle rear side wall portion 36 Closed section 38 Reinforcement panel 40 Floor under reinforcement 44 Reinforcement member

Claims (2)

[Claims] 1. A rocker disposed at both ends in a vehicle width direction of a vehicle floor along a vehicle front-rear direction, and is disposed to be offset inside the vehicle with respect to the rocker, and a front end is directed toward the rocker. A rear underbody structure for a vehicle, comprising: a curved rear side member; and a center floor cross member disposed along a vehicle width direction at an intermediate portion of the vehicle floor in the vehicle front-rear direction. A vehicle width direction inner wall portion intersects a vehicle rear wall portion of the center floor cross member, and one of the vehicle width direction inner wall portion cut off by the intersection portion and the vehicle rear wall portion A rear underbody structure for a vehicle, wherein a reinforcing panel for connecting the intersection and the rocker is provided in an extending direction. 2. A rocker disposed at both ends in the vehicle width direction of the vehicle floor along the front-rear direction of the vehicle, and disposed offset to the inside of the vehicle with respect to the rocker, and a front end of the vehicle faces the rocker. A curved rear side member, a center floor cross member disposed in the vehicle width direction intermediate portion of the vehicle floor along the vehicle width direction and having a closed cross-sectional structure, and a vehicle front and rear direction inside the rocker in the vehicle width direction. And a floor under reinforcement disposed along the rear under body structure of the vehicle, comprising: a vehicle width direction inner wall portion of the rear side member; and a vehicle rear wall portion of the center floor cross member. A vehicle, wherein a reinforcing member is provided to connect the intersection and the floor under reinforcement in the closed cross section of the center floor cross member. Yaandabode structure.