JP2003170865A - Body lower part structure of car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively restrict the behavior of a seat and the movement of the anchor part of a seat belt buckle at the time of collision of a vehicle by effectively reinforcing the mounting part of the seat on a body floor. <P>SOLUTION: The seat is disposed on both right and left sides of the tunnel part 3 of a body floor part 1, the anchor parts of the belt buckles attached to these seats are installed at the seat rear part near the tunnel part (center side), and a connection member 30 for connecting, to each other, the lower faces of floor panel portions corresponding to the right and left rear part center side seat brackets by installing the lower part of the tunnel part thereacross is installed on the lower surface sides of the floor panels of the right and left rear part center side seat brackets 26 for installing the center side seat rear part on the floor panel 2. The rear part center side seat brackets for the right and left seats are connected to the connection member. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower vehicle body structure of an automobile, in particular, a tunnel portion extending in the vehicle front-rear direction is formed in a vehicle body floor panel at a substantially central portion in a vehicle width direction, and the tunnel portion is formed on both left and right sides of the tunnel portion. Seats are arranged, each of these seats is attached to the floor panel via a seat bracket, and further, an anchor portion of a buckle of a seat belt attached to the seat is provided at a seat rear portion near a side of the tunnel portion. The present invention relates to a lower body structure of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a lower body structure of an automobile, a tunnel portion extending in the vehicle front-rear direction is formed at a substantially central portion of a vehicle body floor panel in the vehicle width direction, and seats are arranged on both left and right sides of the tunnel portion. It is generally well known that each of these seats is attached to the floor panel via a seat bracket. For example, a typical arrangement is a front passenger seat (driver's seat and passenger seat) of an ordinary passenger car and a mounting structure on the floor panel.

An anchor portion (fixing portion) for mooring the buckle of the seat belt attached to the seat as described above.
Is usually attached to the rear side of the seat. There is also known a structure in which the anchor portion of the seat belt buckle is provided on the side surface of the seat rear portion near the tunnel portion.

[0004]

By the way, with regard to the seat and its mounting structure (on the vehicle body floor) as described above, one of the basic requirements is to severely limit the behavior of the seat in the event of a vehicle collision. Is required. That is, when the vehicle collides head-on and a collision load and deceleration of a certain amount or more act on the lower part of the vehicle body, the mounting portion of the seat on the floor should not easily come off and the seat itself should not move carelessly. Further, the floor portion supporting the seat mounting portion should not be deformed such as lifted up.

Further, also in the anchor portion of the seat belt / buckle, the front body of the occupant restrained by the seat belt moves forward due to a frontal collision of the vehicle or the like, so that the seat belt is impacted / impacted. Or if the load exceeds a certain level continuously for some time, the seat belt
The anchor part of the buckle must not move and come off easily. That is, the seat mounting portion near the anchor portion should not be easily disengaged, or the floor portion supporting the seat mounting portion should not be deformed such as lifted up.

In response to the above demands, various measures have been conventionally made. For example, in Japanese Unexamined Patent Publication No. 7-165125, when a seat is mounted on a vehicle body floor via a seat bracket, this mounting portion is dealt with. There is disclosed a configuration in which steel sheets are bonded and joined to the back surface side of the floor panel to reinforce the seat attachment portion.

However, the reinforcing effect is limited by simply laminating and joining the steel plates in this manner. In recent years, from the viewpoint of further enhancing the occupant protection performance while the vehicle is running,
The above requirements are becoming more and more severe, and in order to satisfy these requirements, it is required to more effectively reinforce the attachment portion of the seat to the vehicle body floor.

The present invention has been made in view of the above technical problems, and more effectively reinforces a mounting portion of a seat to a vehicle body floor, a behavior of a seat at the time of a vehicle collision, and an anchor portion of a seat belt / buckle. The purpose was to enable more effective regulation of the movement of the.

[0009]

Therefore, the first aspect of the present invention is as follows.
In the lower body structure of an automobile according to the invention (hereinafter, referred to as the first invention), a tunnel portion extending in the vehicle front-rear direction is formed at a substantially central portion of a vehicle body floor panel in the vehicle width direction, and both left and right sides of the tunnel portion are formed. Is a lower body structure of an automobile in which seats are arranged on the floor panel via seat brackets, and the anchor portion of the buckle of the seat belt attached to the seat is It is provided in the seat rear part near the tunnel part, and the seat rear part near the tunnel part is attached to the floor panel respectively. Connection that connects the undersides of the floor panel parts that correspond to the left and right rear center side seat brackets. Material is provided, in which the rear center side seat bracket of the left and right seat is characterized in that, coupled to the coupling member.

The invention according to claim 2 of the present application (hereinafter,
In the first invention, each of the rear center side seat brackets has a bracket mounting portion for mounting the seat rear portion near the tunnel portion to the floor panel, and a rear portion from the bracket mounting portion. And a bracket extension portion extended to the floor panel, the bracket attachment portion being coupled to the connecting member, and the bracket extension portion being joined to the floor panel.

The invention according to claim 3 of the present application (hereinafter,
In the first or second invention, the connecting member is formed such that the vertical cross-sectional shape in a side view is formed into an inverted hat shape, and when the connecting member is attached to the lower surface side of the floor panel, And the rear center side seat bracket is joined to the front and rear flange portions of the connecting member.

The invention according to claim 4 of the present application
(Hereinafter, referred to as a fourth invention), in any one of the first to third inventions, left and right side frames extending in a vehicle front-rear direction are disposed on both left and right sides of the tunnel portion, and the connection is achieved. The left and right ends of the member are respectively connected to the side frames.

The invention according to claim 5 of the present application
(Hereinafter, referred to as a fifth invention) is, in any one of the first to fourth inventions, the rear center side seat bracket and the connecting member are coupled via a bolt member. The head portion of the bolt is fixed to the front surface side of the rear center side seat bracket, while the shaft portion of the bolt member penetrates the rear center side seat bracket, the floor panel and the connecting member. Is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a basic structure of a lower portion of a seat of an automobile according to this embodiment. As shown in this figure, the seat 10 includes a cushion frame 11 that constitutes a frame of a seat seat portion (seat cushion: not shown), and a seat pan that is fixed to the frame 11 and supports a cushion body (not shown). 12
The upper rail 13 of the front and rear slide mechanism is integrally fixed to the lower portion of the cushion frame 11. The upper rail 13 is combined with a lower rail 14 located below the upper rail 13 so as to be slidable in the vehicle front-rear direction. These upper and lower rails 1
The front and rear slide mechanism of the seat 10 is constituted by 3 and 14.

The seat 10 is, for example, a left front seat arranged on the left side floor in the front part of the passenger compartment of an automobile, and the right side (that is, the center side) side surface of the rear part of the cushion frame 11 is An anchor portion for mooring the buckle 15 of the seat belt (not shown) is provided. That is, the terminal portion of the holding member 16 of the seat belt / buckle 15 is the fixing bolt 17 (anchor bolt).
As a result, the rear right side of the cushion frame 11 (that is,
It is fixed to the side (center side).

Front seat mounting brackets 18 are fixed to the front lower parts of the left and right lower rails 14, respectively, and rear seat mounting brackets 19 are fixed to the rear lower parts. Each of the seat mounting brackets 18 and 19 is provided with bolt insertion holes 18h and 19h for mounting. In addition, positioning reference pins 18p are attached to the left and right front seat mounting brackets 18.

Although not specifically shown, the right front seat disposed on the right floor in the front of the passenger compartment basically has the same structure as the left front seat 10. ing. Also for the anchor part (anchor bolt 17) mooring the seat belt buckle 15,
Like the case of the left front seat 10, the cushion frame 11 is provided on the side surface on the rear center side.

FIG. 2 is an explanatory plan view of a vehicle body floor portion in the front portion of the vehicle compartment to which the front seat 10 is attached, FIG. 3 is an enlarged plan explanatory view of a main portion of the vehicle body floor portion, and FIG. FIG. 5 is a perspective view showing the floor panel of the floor portion as seen obliquely from above, and FIG. 5 is a perspective view showing this floor panel as seen from the back side. As shown in these figures, in a vehicle body floor portion 1 according to the present embodiment, a tunnel portion 3 extending in the vehicle body front-rear direction is integrally formed with a floor panel 2 at a substantially central portion in the vehicle width direction. . Left and right front seats 10 are arranged on both left and right sides of the tunnel portion 3.

Left and right side frames extending in the front-rear direction of the vehicle body are provided on both left and right sides of the tunnel portion 3. These side frames 4 are, as shown in FIG.
The steel plate is formed into a substantially hat-shaped cross-section with an opening at the top by pressing, for example, the flange portion 4 thereof.
f is brought into contact with the lower surface side of the floor panel 2 and joined by, for example, spot welding. Also, the tunnel part 3
The left and right horizontal members 5H and 5M of the cross member 5 extending in the vehicle width direction are joined to the relatively front part of the.

The left and right horizontal members 5H and 5M are formed in a substantially U-shaped cross-section with an opening at the bottom by pressing a steel plate, for example, as shown in FIG. 13, taking the right member 5M as an example. The tunnel part 3 at one end
On the other hand, the other end side is joined to a pair of left and right side sills (not shown) that support the left and right side end portions of the floor panel 2, and the lower side is joined to the upper surface of the floor panel 2.
Incidentally, spot welding, for example, is applied to these joining operations. That is, the left and right horizontal members 5H and 5M are
On the upper surface side of the floor panel 2, it extends integrally through the tunnel portion 3 in the vehicle width direction, and is arranged as one cross member 5 so as to bridge between the side sills (not shown).

FIG. 16 is a perspective view of a tunnel reinforcement 41 which reinforces the tunnel portion 3 and connects the center end portions of the left and right horizontal members 5H and 5M to each other on the lower surface side of the floor panel 2. is there. In addition, FIG.
FIG. 4 is a perspective view of a connecting crossbar 42 connecting the left and right ends of the tunnel reinforcement 41. Nut members 43 are fixed to the upper surface sides of the left and right end portions of the tunnel reinforcement 41 (see FIG. 16), and on the other hand, on the left and right end sides of the connecting crossbar 42 corresponding to these fixed nuts 43, Bolt insertion hole 42h
Are provided (see FIG. 17).

Then, as shown in FIGS. 5 and 10, the tunnel reinforcement 41 is connected to the tunnel portion 3.
Predetermined parts (the horizontal members 5 on the left and right of the cross member 5)
The flange portion 41f is attached to the floor panel 2 from the back side with respect to the portion where the center side end portions of H and 5M are joined).
Is abutted on the lower surface of and joined by spot welding, for example. As a result, the center-side ends of the left and right horizontal members 5H and 5M are connected to each other on the lower surface side of the floor panel 2 via the tunnel reinforcement 41. That is, the left and right horizontal members 5H and 5M are connected to each other to
The book cross member 5 is integrally extended in the vehicle width direction via the tunnel portion 3 and its reinforcement 41.

Further, the left and right ends of the tunnel reinforcement 41 are connected and reinforced by a connecting cross bar 42 on the back side thereof. That is, by aligning the fixing nuts 43 fixed to the left and right ends of the tunnel reinforcement 41 and the bolt insertion holes 42h of the connecting crossbar 42, and applying and tightening the bolt member 44 from the back surface side. , Crossbar 4 connected to the left and right ends of the tunnel reinforcement 41
2 is fastened and fixed.

The front portion of the front seat 10 is mounted on the floor panel 2 via the left and right horizontal members 5H and 5M of the cross member 5. That is, the sheet 10
When the front part of the above is attached to the floor panel 2, the left and right horizontal members 5H and 5M of the cross member 5 serve as seat brackets. As shown in FIG. 13, a reference hole 5h for positioning is provided on the upper surfaces of the horizontal members 5H and 5M, and a nut member 6 is fixed to the rear surface side of the upper surfaces of the horizontal members 5H and 5M.

Then, the reference pins 1 of the left and right front seat mounting brackets 18 are inserted into the respective reference holes 5h of the horizontal member 5H or 5M.
8p is inserted, and the fixing nut 6 and the bolt insertion hole 18h of the front seat mounting bracket 18 of the seat 10 are aligned with each other. Seat mounting bracket 1
8 (that is, the front part of the seat 10) is fastened and fixed to the horizontal member 5H or 5M, and as a result, the floor panel 2
Fixed to.

The front portion of the seat 10 is the cross member 5 described above.
Floor panel 2 through (left and right horizontal members 5H, 5M)
The floor part which is attached to the tunnel member to which the cross member 5 is fixed is, as described above,
Left and right horizontal members 5H and 5M with reinforcement 41
By connecting them together, the rigidity against left-right twist and the like is significantly enhanced. Further, the connecting crossbar 42
By connecting the left and right ends of the tunnel reinforcement 41 with each other, the floor rigidity is further increased, and the mounting strength and rigidity of the mounting portion of the seat front portion to the floor panel 2 is improved. There is.

On the other hand, the rear portion of the front seat 10 is
It is mounted on the floor panel 2 via a seat bracket. FIG. 11 is a perspective view of the seat bracket 25 (rear side side seat bracket) for mounting the outer side (side side) in the rear part of the front seat 10. FIG. 12 shows a seat bracket 26 (rear center side seat bracket) for attaching the inner side (center side: that is, the side closer to the tunnel portion 3) in the rear part of the front seat 10, for example, the right one. It is the perspective view taken and shown.

The rear side seat bracket 25 mentioned above.
(See FIG. 11) is a mounting portion 25 having a flat upper surface.
A box-shaped main body portion 25b having a and a flange portion 25f formed so as to surround the periphery thereof are provided on the floor panel 2 (for example, the flat portion and the side portion of the floor panel 2 by spot welding). It is joined to the end wall).

Then, the mounting portion 25a of the main body portion 25b.
After aligning the screw hole 25h provided in the seat 10 with the bolt insertion hole 19h of the seat mounting bracket 19 on the rear side of the seat 10, a bolt member (not shown) is inserted from above and tightened, so that the rear side The seat mounting bracket 19 (that is, the rear side of the seat 10) is fastened and fixed to the rear side seat bracket 25, and as a result, fixed to the floor panel 2.

The rear center side seat bracket 26 (FIG. 12) has a mounting portion 26 having a flat upper surface.
A main body portion 26b having a and a flange portion 26f formed so as to surround the periphery thereof are provided on the floor panel 2 (for example, a flat portion of the floor panel 2 by spot welding and bolt members 27). Bonded to the side surface of the tunnel portion 3).

A nut 28 is fixed to the rear surface side of the mounting portion 26a of the main body portion 26b.
And the bolt insertion hole 19h of the rear seat mounting bracket 19 of the seat 10 are aligned with each other, and a bolt member (not shown) is inserted from above to tighten the rear seat mounting bracket 19 (that is, The rear center side of the seat 10 is fastened and fixed to the rear center side seat bracket 26, and as a result, fixed to the floor panel 2.

The rear center side seat bracket 26
Is formed in a slender shape in the vehicle front-rear direction, and the mounting portion 26a for mounting the center side of the seat rear portion (that is, the side closer to the tunnel portion 3) to the floor panel 2 is the bracket 26.
It is located relatively on the front side of and has an extension portion 26c extending rearward from the attachment portion 26a. This extension 2
The flange portion 26f of 6c is also entirely joined to the floor panel 2.

As described above, not only the mounting portion 26a for mounting the rear seat on the center side (the side close to the tunnel portion) to the floor panel 2 but also the rear center side seat bracket 26 is extended rearward from the mounting portion 26a. Since the bracket extension portion 26c can be integrally provided, and the extension portion 26c is also joined to the floor panel 2, the joining area of the rear center side seat bracket 26 to the floor panel 2 can be ensured to be that wide, and the joining strength can be increased. Is increased. As a result, the mounting strength of the rear center side seat bracket 26 to the floor panel 2 is further enhanced, and the seat bracket 26 is not easily peeled off even if an external force acts on the seat bracket 26 during a vehicle collision.

An anchor portion 17 of a buckle 15 of a seat belt (not shown) attached to the front seat 10 is provided.
Is provided at the seat rear portion on the side close to the tunnel portion 3 (center side). Therefore, the stability of the position of the anchor portion 17 depends on the mounting strength and the rigidity of the rear center side seat bracket 26 to the floor panel 2 to a great extent.

In this embodiment, as shown in FIGS. 2, 3 and 4, the left and right rear center side seat brackets 26 of the center side (the side close to the tunnel portion) seat rear portions are respectively attached to the floor panel 2. On the lower surface side of the floor panel, there is provided a connecting member 30 which extends under the tunnel portion 3 and connects the lower surfaces of the floor panel portions corresponding to the left and right rear center side seat brackets 26.

As described above, the lower surfaces of the floor panel portions corresponding to the left and right rear center side seat brackets 26 are connected to each other on the lower surface side of the floor panel 2 by the connecting member 30 so as to extend under the tunnel portion 3. The rear center seat brackets 26 of the left and right seats 10 are joined to the connecting member 30. As a result, the mounting strength of each rear center side seat bracket 26 is significantly increased, and the mounting portion of the seat 10 to the vehicle body floor portion 1 via the bracket 26 is reinforced more effectively. The behavior of the seat 10 and the movement of the anchor portion 17 of the seat belt / buckle 15 at the time of a vehicle collision can be more effectively restricted.

As shown in FIG. 14, this connecting member 30 is formed into a substantially hat-shaped cross-section (that is, the vertical cross-sectional shape in a side view is an inverted hat-shape) having an opening at the top by pressing a steel plate, for example. Cage and its flange 3
0f is brought into contact with the lower surface side of floor panel 2 and fastened and fixed to the lower surface side of floor panel 2. Bolt holes 30h for inserting the bolt members (not shown) for fastening and fixing are provided at a plurality of appropriate places of the flange portion 30f. As can be seen from FIGS. 2 and 3, the rear center side seat brackets 26 of the left and right seats 10 are joined to the connecting member 30 (specifically, the flange portion 30f of the connecting member 30).

In the state where the connecting member 30 is fastened and fixed to the lower surface side of the floor panel 2, as shown in FIGS. 8 and 9, the flow panel 2 and the connecting member 30 form a closed cross section. By forming the closed cross section on the lower surface side of the floor panel 2 as described above, the rigidity of the vehicle body floor portion 1 is increased, and floor vibration during traveling of the vehicle is suppressed, which contributes to improvement of traveling stability. it can. Further, the rear center side seat bracket 26 is further coupled to the front and rear flange portions 30f of the connecting member 30 to further enhance the mounting strength and rigidity thereof.

As can be seen from FIGS. 2, 3, 6 and 7, the left and right ends of the connecting member 30 are respectively attached to the pair of left and right side frames 4 extending in the vehicle front-rear direction on both the left and right sides of the tunnel portion 3. Are combined. Specifically, the flange portion 30f of the connecting member 30 is joined to the flange portion 4f of the side frame 4 (see FIGS. 6 and 7). By connecting the left and right ends of the connecting member 30 to the left and right side frames 4 respectively in this manner, the rigidity in the vehicle width direction at the lower part of the vehicle body is increased, and the vehicle body when the vehicle is subjected to a side collision is added. The effect of can be reduced.

The connecting member 30 is joined after the vehicle body members on the lower surface side of the floor panel 4 such as the left and right side frames 4 are joined, and further, after the rear center seat bracket 26 is joined on the upper surface side of the floor panel 2. Afterwards, it is fastened and fixed to the lower surface side of the floor panel 4. That is, as shown in FIGS. 6 to 9, the rear center side seat bracket 26 and the connecting member 30 are connected to each other through a bolt member (stud bolt), and the head of the stud bolt 31 is a rear portion. While being seated and fixed on the front surface side of the flange portion 26f of the center side seat bracket 26,
The shaft portion of the stud bolt 31 passes through the rear center side seat bracket 26 (its flange portion 26f), the floor panel 2 and the connecting member 30 (its flange portion 30f), and is then tightened in combination with the nut 32.

At the left and right ends of the connecting member 30, the head of the stud bolt 31 is fixed to the upper surface of the floor panel 2, while the shaft of the stud bolt 31 has the shaft portion of the floor panel 2 and the side frame 4 (the flange thereof). After being penetrated through the portion 4f) and the connecting member 30 (the flange portion 30f), the nut 32 is combined and tightened.

As described above, since the rear center side seat bracket 26 and the connecting member 30 are connected via the bolt member 31, the rear center side seat bracket 2 is provided.
After fixing 6 to the upper surface side of the floor panel 2, the connecting member 30 can be easily retrofitted from the lower surface side of the floor panel 2 and the assembling workability at the time of assembling the lower portion of the vehicle body can be improved. Of.

The present invention is not limited to the above-mentioned embodiments, and within the scope of the gist of the present invention,
It goes without saying that various improvements and design changes are possible.

[0044]

According to the lower vehicle body structure for an automobile according to the first invention of the present application, the lower surfaces of the floor panel portions corresponding to the left and right rear center side seat brackets are connected to each other by the connecting member on the lower surface side of the floor panel to form the tunnel portion. And is connected to the rear center side seat brackets of the left and right seats. As a result, the mounting strength of each rear center side seat bracket is significantly increased, and the mounting portion of the seat to the vehicle body floor via the bracket is reinforced more effectively. And
Seat behavior and seat belt in a vehicle collision
The movement of the anchor portion of the buckle can be regulated more effectively.

Further, according to the second invention of the present application, basically the same effect as that of the first invention can be obtained. In particular, the rear center side seat bracket includes not only a bracket attachment portion for attaching the seat rear portion near the tunnel portion to the floor panel, but also a bracket extension portion extended rearward from the bracket attachment portion. Is joined to the floor panel, so that the joining area of the rear center side seat bracket to the floor panel can be secured to that extent, and the joining strength can be increased. As a result, the mounting strength of each rear center side seat bracket to the floor panel can be further increased.

Further, according to the third invention of the present application, basically the same effect as that of the first or second invention can be obtained. In particular, the connecting member is formed in an inverted hat shape in a vertical cross-sectional shape in a side view, and when attached to the lower surface of the floor panel, forms a closed cross section together with the flow panel, so that the rigidity of the vehicle body floor is increased. ,Also,
Floor vibration during traveling of the vehicle is suppressed, which can contribute to improvement of traveling stability. Furthermore, since the rear center side seat bracket is connected to the front and rear flanges of the connecting member, its mounting strength and rigidity can be further enhanced.

Further, according to the fourth invention of the present application,
Basically, the same effect as that of any one of the first to third inventions can be obtained. In particular, since the left and right ends of the connecting member are respectively connected to the left and right side frames extending in the vehicle front-rear direction on both the left and right sides of the tunnel portion, the rigidity in the vehicle width direction at the lower part of the vehicle body is enhanced,
It is possible to reduce the influence on the vehicle body when the vehicle receives a side collision.

Further, according to the fifth invention of the present application,
Basically, the same effect as any one of the above-mentioned first to fourth inventions can be obtained. Particularly, since the rear center side seat bracket and the connecting member are connected via the bolt member, it is easy to retrofit the connecting member from the floor panel lower surface side after fixing the rear center side seat bracket to the floor panel upper surface side. It is possible to improve the assembling workability when assembling the lower part of the car body.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic structure of a lower portion of a front seat of an automobile according to an embodiment of the present invention.

FIG. 2 is a plan view of a vehicle body floor portion in a front portion of a vehicle compartment to which the front seat is attached.

FIG. 3 is an explanatory plan view showing an enlarged main part of the vehicle body floor portion.

FIG. 4 is a perspective view showing a floor panel of the vehicle body floor portion as viewed obliquely from above.

FIG. 5 is a perspective view showing the floor panel as viewed from the back side.

6 is a cross sectional explanatory view showing a part of a cross section taken along line Y6-Y6 of FIG. 3. FIG.

7 is a cross-sectional explanatory view showing a part of a cross section taken along line Y7-Y7 of FIG. 3. FIG.

8 is a cross sectional view showing a part of a cross section taken along line Y8-Y8 of FIG.

9 is a cross sectional explanatory view showing a part of a cross section taken along line Y9-Y9 of FIG. 3. FIG.

10 is a cross-sectional explanatory view showing a part of a cross section taken along line Y10-Y10 of FIG.

FIG. 11 is a perspective view of a rear side seat bracket for mounting the front seat.

FIG. 12 is a perspective view of a rear center side seat bracket for mounting the front seat.

FIG. 13 is a perspective view of a horizontal member forming the cross member of the vehicle body floor portion.

FIG. 14 is a perspective view of a connecting member of the vehicle body floor portion.

FIG. 15 is a perspective view of a side frame of the vehicle body floor portion.

FIG. 16 is a perspective view of a tunnel reinforcement of the vehicle body floor portion.

FIG. 17 is a perspective view of the connecting crossbar of the vehicle body floor portion.

[Explanation of symbols]

1 ... Body floor 2… Floor panel 3 ... Tunnel section 4 ... Side frame 5 ... Cross member 5H ... Horizontal member on the left side 5M ... Horizontal member on the right side 10 ... Front seat 15 ... Seat belts and buckles 17 ... Anchor Bolt 18 ... Front seat mounting bracket 19 ... Rear seat mounting bracket 25 ... Rear side seat bracket 26 ... Rear center side seat bracket 30 ... Connection member 31 ... Stud bolt

Claims (5)

[Claims] 1. A tunnel portion extending in the vehicle front-rear direction is formed at a substantially central portion of a vehicle body floor panel in a vehicle width direction, and seats are arranged on both left and right sides of the tunnel portion, and each of these seats has a seat bracket. A lower vehicle body structure of an automobile attached to the floor panel through, wherein an anchor portion of a buckle of a seat belt attached to the seat is provided at a seat rear portion near a side of the tunnel portion. Attaching the rear seats near the tunnel to the floor panels respectively, the floors corresponding to the left and right rear center seat brackets are laid across the undersides of the floor panels of the left and right rear center seat brackets. A connecting member is provided to connect the lower surfaces of the panel parts, and A lower vehicle body structure for an automobile, wherein a side seat bracket is connected to the connecting member. 2. Each of the rear center side seat brackets includes a bracket mounting portion for mounting a seat rear portion near the tunnel portion to the floor panel, and a bracket extension portion extending rearward from the bracket mounting portion. 2. The lower vehicle body structure of the automobile according to claim 1, wherein the bracket attachment portion is coupled to the connecting member, and the bracket extension portion is joined to the floor panel. 3. The connecting member is formed such that a vertical cross-sectional shape in a side view is formed into an inverted hat shape, and when attached to the lower surface side of the floor panel, forms a closed cross section with the flow panel, and the rear center side. The lower body structure of the automobile according to claim 1 or 2, wherein the seat bracket is coupled to front and rear flange portions of the connecting member. 4. The left and right side frames extending in the vehicle front-rear direction are disposed on both left and right sides of the tunnel portion, and the left and right end sides of the connecting member are respectively coupled to the side frames. Claims 1 to 3
The lower body structure of the automobile according to any one of 1. 5. The rear center side seat bracket and the connecting member are coupled via a bolt member, and the head of the bolt member is fixed to the front surface side of the rear center side seat bracket, while The lower body structure of the automobile according to any one of claims 1 to 4, wherein a shaft portion of the bolt member penetrates the rear center side seat bracket, the floor panel and the connecting member.