WO2018055855A1

WO2018055855A1 - Seat mounting structure

Info

Publication number: WO2018055855A1
Application number: PCT/JP2017/022458
Authority: WO
Inventors: 貴之相馬
Original assignee: 本田技研工業株式会社
Priority date: 2016-09-21
Filing date: 2017-06-19
Publication date: 2018-03-29
Also published as: CN109789898A; CN109789898B

Abstract

The purpose of the present invention is to improve the riding comfort of an occupant by increasing the seat support rigidity of the vehicle floor. This seat mounting structure includes: a floor panel (11) provided between a tunnel portion (12) and a side sill (13); and a cross member (15) extending along the floor panel (11) in the vehicle width direction. The seat mounting structure further includes: a tunnel-portion-side seat mounting bracket (16) at an end portion of the cross member (15) on the tunnel portion (12) side; and a side-sill-side seat mounting bracket (17) at an end portion of the cross member (15) on the side sill (13) side. The floor panel (11) protrudes downward with respect to the tunnel portion (12) and the side sill (13). The heights of both end portions (15a, 15b) of the cross member (15) are set to be higher than that of a center portion (15c) of the cross member (15). The end portions (15a, 15b) are respectively coupled to the first and second brackets (16, 17).

Description

Seat mounting structure

The present invention relates to a seat mounting structure that increases the seat support rigidity of a vehicle floor to improve the ride comfort of an occupant.

Conventionally, as a vehicle floor seat mounting structure of the kind described above, for example, there is a vehicle body lower structure described in Patent Document 1. In this structure, a cross member extending in the vehicle width direction is provided between the tunnel portion at the top of the floor panel and the side sill to which the center pillar is coupled. At the time of a side collision to the vehicle, the load from the side sill is supported by the frame member at the lower part of the floor panel via the outer side in the vehicle width direction of the high-strength cross member. A passenger seat is supported at both ends of the cross member via a seat mounting bracket (also referred to as a bracket).

Japanese Patent No. 5391771

By the way, in the structure of Patent Document 1, it is effective to lower the floor panel and reduce the distance from the ground in order to reduce the air resistance during travel of the vehicle body. On the other hand, the cross section of the cross member main body cannot be enlarged under the condition of reducing the weight on the lower side from the seat. In other words, when the cross panel of the cross member body is small and the floor panel is lowered as described above, when the both ends of the cross member are joined to the bracket, the cross member has a small cross section at both ends and the floor panel is lowered. The area for connecting both ends of the cross member to the bracket is reduced. When a load exceeding a predetermined value is applied from the seat to the lower side with this small structure, the joint portion of the cross member with the bracket is bent to cause a problem that the seat support rigidity is lowered and the ride comfort of the occupant is deteriorated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a seat mounting structure capable of enhancing the seat support rigidity of the vehicle floor and improving the ride comfort of the occupant.

To achieve the above object, the present invention provides a floor panel disposed between a tunnel portion and a side sill, a cross member extending in the vehicle width direction along the floor panel, and the cross member. A first bracket for seat attachment provided at an end portion of the tunnel portion side, and a second bracket for seat attachment provided at an end portion of the cross member on the side sill side, and the floor panel includes: Projecting downward from the tunnel portion and the side sill, the height of both end portions of the cross member is formed higher than the height of the central portion of the cross member, and the both end portions are coupled to the first and second brackets. It is characterized by being.

In the present invention, it is possible to obtain a seat mounting structure that increases the seat support rigidity of the vehicle floor and improves the ride comfort of the occupant.

1 is a perspective view showing a vehicle floor seat mounting structure according to an embodiment of the present invention. It is a perspective view which shows the seat attachment structure of the vehicle left side of this embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a perspective view which shows the attachment structure of the tunnel part side sheet | seat attachment bracket. It is a perspective view which shows the shape of the edge part of the cross member by the side of a tunnel part. It is a perspective view which shows the attachment structure of a side sill side sheet | seat attachment bracket. It is a perspective view which shows the shape of the edge part of the cross member by the side sill. It is sectional drawing which shows the junction structure of the tunnel part side sheet | seat mounting bracket and the edge part of a cross member. It is a perspective view of a bracket when the side sill side seat mounting bracket is cut in the vehicle front-rear direction at the center position of the seat rail mounting nut. It is a perspective view which shows the structure of a seat rail fixing | fixed part. It is a perspective view which shows the attachment structure of the pretensioner for seatbelt drawing in to the side sill side seat attachment bracket part. It is sectional drawing of the vicinity of the center part of the cross member shown in FIG. 3, and a floor frame.

<Configuration of Embodiment>
Embodiments of the present invention will be described in detail with reference to FIGS. In the description, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted. In each figure, “front and rear” indicates the vehicle longitudinal direction, “outside and center” indicate the vehicle width outward direction, vehicle width center direction, and “up and down” indicate the vertical vertical direction.

As shown in FIG. 1, the seat mounting structure for the floor of the vehicle 10 includes a tunnel portion 12 that extends in the vehicle longitudinal direction on the floor panel 11 at the center position in the vehicle width direction, and a longitudinal direction at lower positions on both sides of the vehicle. Front and

rear cross members

14 and 15 extending in the vehicle width direction are provided in parallel with the side sill 13 extending in the direction of the vehicle. Further, in the seat mounting structure, a tunnel portion side seat mounting bracket (also referred to as a bracket) 16 and a side sill side seat mounting bracket (also referred to as a bracket) 17 are disposed at both ends of the rear cross member 15. The occupant seat 1 is supported. In addition, the tunnel part side sheet | seat mounting bracket 16 comprises the 1st bracket of a claim. The side sill side seat mounting bracket 16 constitutes the second bracket described in the claims.

The tunnel portion 12 has a convex cross-sectional shape, and has a shape in which left and right inclined side surfaces 12a and an upper surface 12b between the side surfaces 12a are integrated. On the floor panel 11, an elongated plate-like floor frame 18 extending in the vehicle front-rear direction is disposed at an intermediate position between the tunnel portion 12 and the side sill 13. The floor frame 18 is disposed so as to cross under the front cross member 14 (for example, orthogonal) and cross over the rear cross member 15 (for example, orthogonal).

Since the seat mounting structure on the floor of the vehicle 10 has a symmetrical structure with the tunnel portion 12 in between, the seat mounting structure on the left side of the vehicle will be described with reference to FIG. FIG. 3 is a cross-sectional view taken along line AA along the cross member 15 at the rear of FIG.
As shown in FIG. 3, the floor panel 11 is located on the vehicle lower side than the tunnel portion 12 and the side sill 13 between the lower end of the side surface 12 a of the tunnel portion 12 and the inner lower member 13 a extending horizontally of the side sill 13. It is arranged in a shape that protrudes in a gentle curve. On the inner lower member 13 a of the side sill 13, an inner upper member 13 b is disposed upright.

The cross member 15 extends on the floor panel 11 in the vehicle width direction along the floor panel 11, and both extended

end portions

15 a and 15 b are joined to

brackets

16 and 17 on both sides. . The heights H1 and H2 of both

end portions

15a and 15b of the cross member 15 are higher than the height H3 of the central portion 15c, so that the coupling area to the

brackets

16 and 17 on both sides can be increased. Yes.

The

brackets

16 and 17 on both sides have the same shape, and the front flange FFb, the front surface Fb, the top surface, as shown in FIG. 4A showing the tunnel side seat mounting bracket 16 and FIG. 5A showing the side sill side seat mounting bracket 17. Ub, rear surface Bb (FIG. 6), and rear flange BFb (FIG. 6) are integrally formed to form a cross-sectional hat shape (FIG. 6).

Both

end portions

15a and 15b of the rear cross member 15 have the same shape, and FIG. 4B shows the end portion 15a on the tunnel portion 12 side, and FIG. 5B shows the end portion 15b on the side sill 13 side. The cross-sectional hat shape (FIG. 6) which integrally provided the flange FFk, the front surface Fk, the upper surface Uk, the rear surface Bk (FIG. 6), and the rear flange BFk is comprised.

As shown in the cross-sectional view of FIG. 6, the

brackets

16 and 17 on both sides of the shape and the both

end portions

15a and 15b of the cross member 15 are connected to the end portions 15a of the cross member 15 inside the bracket 16 (or 17). (Or 15b) is housed, and the front flanges (FFb, FFk), the front surfaces (Fb, Fk), the rear surfaces (Bb, Bk), and the rear flanges (BFb, BFk) are overlapped and joined. .

In particular, as described above, the front surface Fk and the rear surface Bk of the one end portion 15a of the cross member 15 that is higher than the central portion 15c (FIG. 3) are coupled to the front surface Fb and the rear surface Bb of one bracket 16, The front surface Fk and the rear surface Bk of the other end 15b of the other bracket 17 are coupled to the front surface Fb and the rear surface Bb of the other bracket 17.

As shown in FIG. 4A, even if there is a step 11 </ b> D (see FIG. 3) that is recessed downward on the floor panel 11 below the position where the bracket 16 is disposed, Since the front and rear surfaces of the end 15a of the cross member 15 and the bracket 16 are coupled to each other at the position, they can be coupled to each other over a wide area. The step 11D is provided to form a positioning hole in the floor panel 11.

As shown in FIG. 4A, the bracket 16 on the tunnel portion 12 side protrudes from the upper surface Ub and is connected to the side surface 12a of the tunnel portion 12, and the bracket 16 on the side of the tunnel portion 12 is protruded from the front surface Fb and connected to the side surface 12b. A side flange SFf and a rear side flange SFk protruding from the rear surface Bb and coupled to the side surface 12b are provided. Similarly, as shown in FIG. 5A, the bracket 17 on the side sill 13 side protrudes from the upper surface Ub and is coupled to the side sill 13, and the front side flange SFf is projected from the front surface Fb and coupled to the side sill 13. And a rear side flange SFk protruding from the rear surface Bb and coupled to the side sill 13.

As described above, the

brackets

16 and 17 on both sides are provided with the front flange FFb, the front surface Fb, the upper surface Ub, the rear surface Bb, and the rear flange BFb shown in FIGS. 4A and 5B, as well as the front surface Fb, the upper surface Ub, and the rear surface Bb. Side surfaces Sb that are connected to and extend are formed. The side surface Sb extends gently in the longitudinal direction of the cross member 15, and a side flange SFb is provided on the tip side.

As shown in FIG. 4B, the side flange SFb of the tunnel portion side seat mounting bracket 16 is coupled to the upper surface position of the cross member 15 that is separated from the end surface 15t of the cross member 15 by a predetermined length D1 outward in the vehicle width direction. By joining in such a distant position, the joining strength of the bracket 16 to the cross member 15 increases. Similarly, the side flange SFb of the side sill side seat mounting bracket 17 may also be configured.

FIG. 7 is a perspective view of the bracket 17 when the bracket 17 on the side sill 13 side is cut in the vehicle front-rear direction at the center position of a seat rail mounting nut (also referred to as a nut) 19f. The bracket 17 (or 16) includes a seat rail fixing portion 19 shown in FIG. The seat rail fixing portion 19 includes a plane portion 19b having a through hole 19a formed at the approximate center, a base portion 19e formed integrally with a load transmitting portion 19c and a positioning claw portion 19d, and a seat rail mounting nut. (Also referred to as a nut) 19f. The load transmitting portion 19c is a portion that is bent and extends to the rear side (or front side) with a predetermined width from one end of the flat portion 19b. The positioning claw portion 19d is a portion that is bent at a predetermined width from the other end portion of the flat portion 19b and extends in the side sill 13 side direction.

The seat rail fixing portion 19 is coupled to the inside of the bracket 17 as shown in FIG. Specifically, the flat surface portion 19b of the seat rail fixing portion 19 is coupled to the back surface of the upper surface Ub of the bracket 17, the load transmitting portion 19c is coupled to the rear surface of the bracket 17, and the positioning claw portion 19d is disposed on the side sill 13 side of the bracket 17. It extends and is arranged. Further, a nut 19f in which a nut hole is fitted in the through hole 19a of the flat portion 19b is fixed to the flat portion 19b. Further, as shown in FIG. 8, a tip 19d1 cut into a semicircular shape (concave) is formed at the tip of the positioning claw 19d, and the tip 19d1 penetrates the bracket 17 shown in FIG. It fits in the positioning hole 17c and is fixed with a screw (not shown). As shown in FIGS. 4A and 4B, the seat rail fixing portion 19 is similarly fixed to the inner side in the bracket 16 on the tunnel portion 12 side.

In the structure in which the seat rail fixing portions 19 are fixed to the

brackets

16 and 17 on both sides as described above, as shown in FIG. 3, the through holes of the seat rail 1 a are the seat mounting holes h 1 and the through holes of the

brackets

16 and 17. The seat rail 1a is attached by being fitted to the nut 19f via 19a, the bolt 1B being screwed to the nut 19f.

In the bracket 17 on the side sill 13 side, as shown in FIG. 3, the upper surface Ub on the side sill 13 side (vehicle side surface side) with respect to the seat rail fixing portion 19 that is the mounting portion (seat mounting portion) of the seat rail 1a is The inclined surface 17d is inclined downward toward the bottom. As shown in FIG. 3, the cross-sectional shape of the bracket 17 in the vehicle width direction is gradually increased in the direction from the side sill 13 toward the tunnel portion 12 until the cross-sectional area of the inclined surface 17d reaches the seat mounting portion. It has an expanding shape.

The rear cross member 15 has a concave upper surface at the center as indicated by reference numeral 15d in FIG. A cross frame (for example, orthogonal shape) floor frame 18 is disposed (see FIG. 2) and coupled to the recessed portion 15d.

FIG. 10 is a cross-sectional view of the vicinity of the center member 15c of the cross member 15 and the floor frame 18 shown in FIG. As shown in FIG. 10, the above-described recessed portion 15 d of the cross member 15 includes a first recess 15 e in which a floor frame 18 that intersects the cross member 15 (for example, an orthogonal shape) is disposed, and a longitudinal direction of the floor frame 18. And a second recess 15f that accommodates a reinforcing bead 18a that is formed by being bent downward in a convex shape.

As shown in FIG. 2, a rear cross member 15 having

brackets

16 and 17 disposed on both sides is provided, but a cross member (referred to as a front cross member) having a larger cross-sectional shape than the rear cross member 15 is provided in front of this. 14. The front cross member 14 is disposed in a crossing manner (for example, orthogonal) with the floor frame 18 along the floor panel 11, in other words, in parallel with the rear cross member 15, and both sides of the tunnel portion 12 and Bonded to the side sill 13. The front cross member 14 includes seat

rail fixing portions

14a and 14b provided with through holes for fixing the seat rail 1a (see FIG. 3) on both sides.

<Effect of embodiment>
Next, the characteristic configuration and effects of the seat mounting structure of the present embodiment described above will be described.
(1) As shown in FIG. 3, the seat mounting structure includes a floor panel 11 disposed between the tunnel portion 12 and the side sill 13, and a cross member extending in the vehicle width direction along the floor panel 11. 15 (see FIG. 2). Further, a first bracket for mounting a seat (tunnel portion side seat mounting bracket) 16 provided at an end portion of the cross member 15 on the tunnel portion 12 side, and a seat mounting portion provided on an end portion of the cross member 15 on the side sill 13 side. The second bracket (side sill side seat mounting bracket) 17 is provided. The floor panel 11 projects downward from the tunnel portion 12 and the side sill 13, and the cross member 15 has heights H1 and H2 of both

end portions

15a and 15b higher than a height H3 of the central portion 15c of the cross member 15. The both

end portions

15a and 15b are coupled to the first and

second brackets

16 and 17, respectively.

According to this configuration, in the cross member 15, the heights H1 and H2 of both

end portions

15a and 15b coupled to the first and

second brackets

16 and 17 are higher than the height H3 of the central portion 15c. For this reason, since the coupling area to the first and

second brackets

16 and 17 is expanded, the coupling rigidity can be increased. Therefore, even if the cross member 15 is disposed along the floor panel 11 projecting downward from the tunnel portion 12 and the side sill 13, the coupling rigidity to the first and

second brackets

16 and 17 is increased. Even when a predetermined load or more is applied downward from the seat 1, the connecting portion of the cross member 15 with the first and

second brackets

16 and 17 is not bent. For this reason, the seat support rigidity is increased and the ride comfort of the occupant on the seat 1 can be improved. Moreover, since the floor panel 11 protrudes below the tunnel portion 12 and the side sill 13, the air resistance when the vehicle 10 is traveling can be lowered.

(2) As shown in FIGS. 4 and 5, both

end portions

15a and 15b of the cross member 15 and

brackets

16 and 17 on both sides are the front flanges FFk and FFb on the front side of the vehicle, the front surfaces Fk and Fb, and the upper surface of the vehicle. This is a cross-sectional hat shape integrally including the upper surfaces Uk and Ub on the side, the rear surfaces Bk and Bb on the vehicle rear surface side, and the rear flanges BFk and BFb. Then, the front surfaces Fk and Fb of both the one end portion 15a of the cross member 15 and the bracket 16 and the rear surfaces Bk and Bb are coupled together, and the other end portion 15b of the cross member 15 and the front surfaces Fk of both the brackets 17 are combined. , Fb and the rear surfaces Bk, Bb are combined.

According to this configuration, the front surface Fk and the rear surface Bk of both

end portions

15a and 15b of the cross member 15 that are higher than the central portion 15c of the cross member 15 are coupled to the front surface Fb and the rear surface Bb of the

brackets

16 and 17 on both sides. . For this reason, even if there is a step 11D (see FIG. 2) recessed downward in the floor panel 11 below the position where the bracket 16 is disposed, the end 15a of the cross member 15 and the bracket 16 at a position higher than the step 11D. Since both the front and rear surfaces are coupled to each other, they can be coupled in a wide area. As a result, the coupling rigidity can be increased.

Thus, since both ends 15a and 15b can be combined at a high position with coupling rigidity, even if the floor panel 11 has a step 11D, the portion of the cross member 15 that crosses the step 11D can be formed in a smooth shape. . Moreover, even if it is the floor panel 11 with the level | step difference 11D, the

brackets

16 and 17 can be arrange | positioned via the cross member 15 which crosses over the level | step difference 11D. Furthermore, since both

end portions

15a and 15b can be coupled with high coupling rigidity, the cross section of the central portion 15c of the cross member 15 can be reduced, and thus the weight of the cross member 15 can be reduced. Furthermore, since the end 15a of the cross member 15 and the bracket 16 are coupled with high coupling rigidity, even if a load exceeding a predetermined value is applied from the seat 1 to the lower side, the load is smoothly applied from the

brackets

16 and 17 to the cross member 15. It can be transmitted and passenger comfort can be improved.

(3) As shown in FIGS. 4 and 5, the brackets 16 and 17 (see FIGS. 4 and 5) on both sides have a front flange FFb, a front surface Fb, a rear surface Bb, and a rear flange BFb, and both end portions of the cross member 15. The side flange SFb, which is joined to the front surfaces Fb, the upper surface Ub, and the rear surface Bb of the

brackets

16 and 17, and is connected to the front surfaces Fb of the

brackets

16 and 17, is provided in advance in the longitudinal direction from the end surface 15t of the cross member 15 in advance. It was set as the structure couple | bonded with the position where predetermined predetermined length D1 spaced apart.

According to this configuration, the side flange SFb of the side surface Sb of the

brackets

16 and 17 in which the front flange FFb, the front surface Fb, the rear surface Bb, and the rear flange BFb are joined to both

ends

15a and 15b of the cross member 15 Are joined to a position separated by a length D1 in the longitudinal direction. With this joining structure, the joining strength of the

brackets

16 and 17 to the cross member 15 is increased, so that the strength and rigidity can be increased and the seat rail 1a can be supported. Further, since the joining strength of the

brackets

16 and 17 is increased, the cross member 15 itself can be made thin to reduce the strength and rigidity, thereby reducing the weight. Further, with the above-described joining structure, even when a predetermined load or more is applied from the seat 1 to the lower side, the load can be smoothly transmitted from the

brackets

16 and 17 to the cross member 15 to improve the ride comfort of the occupant. it can.

(4) The

brackets

16 and 17 on both sides are bent from the end portion of the base portion 19e having a nut 19f for attaching the seat rail 1a fixed to the upper surface and the front side or the rear surface of the

brackets

16 and 17 It was set as the structure provided with the seat rail fixing | fixed part 19 (refer FIG. 8) which has the load transmission part 19c fixed to the side.

According to this configuration, even if the

brackets

16 and 17 on both sides are lightened with a cross-sectional hat shape and the seat rail fixing portion 19 is provided in combination, even if a predetermined load or more is applied downward from the seat 1, this load Is efficiently transmitted from the load transmitting portion 19c of the seat rail fixing portion 19 to the front surface Fb or the rear surface Bb of the

brackets

16 and 17. For this reason, the ride comfort of the occupant's seat 1 can be improved.

(5) The seat rail fixing portion 19 shown in FIG. 8 has a distal end portion 19d1 which is bent and extended from an end portion at a position different from the end portion where the load transmitting portion 19c of the base portion 19e is bent, and is cut out in a concave shape. A positioning claw portion 19d arranged at the position of a positioning hole 17c formed on the upper surface of the first or

second bracket

16, 17 is further provided (see FIG. 7).

According to this configuration, when the seat rail fixing portion 19 is welded to the first and

second brackets

16 and 17, the jig pin is attached to the distal end portion of the positioning claw portion 19d from the positioning hole 17c on the upper surface Ub of the

brackets

16 and 17. Since it can be inserted and positioned, the seat rail fixing portion 19 having the load transmitting portion 19c can be accurately aligned and coupled to two different surfaces of the upper surface Ub and the front surface Fb or the rear surface Bb of the

brackets

16 and 17.

(6) As shown in FIG. 3, the side sill side seat mounting bracket 17 has an upper surface Ub on the vehicle side surface lower than the seat rail 1 a mounting portion on which the seat rail fixing portion 19 is disposed, and is directed downward toward the vehicle side surface. It was set as the structure provided with the inclined surface 17d inclined to the side.

According to this configuration, when the cross-sectional shape of the bracket 17 in the vehicle width direction is the direction from the side sill 13 toward the tunnel portion 12, the cross-sectional area gradually increases until the cross-sectional area reaches the mounting portion of the seat rail 1 a. It becomes a shape that expands. With this shape, in the direction from the side sill 13 to the tunnel portion 12, the cross-sectional area of the inclined surface 17d gradually increases and the cross-section coefficient increases, so that the force capable of dispersing the load at the time of a side collision increases. For this reason, the bracket 17 is not easily broken by the side collision, and therefore, a cross-sectional concave portion composed of an inclined surface 17d that is lowered to the side sill 13 and a portion in which the cross-sectional shape from the lowermost end of the inclined surface 17d to the side sill 13 is reduced. As shown in FIG. 9, a seat belt retracting pretensioner (pretensioner) 21 can be disposed on the upper surface Ub.

Thus, since the pretensioner 21 can be arranged on the upper surface corresponding to the concave portion of the cross section, that is, the concave surface, the arrangement space can be reduced. The pretensioner 21 is a mechanism equipped for the purpose of improving the protection performance of the occupant by removing the slack of the belt (webbing) of the seat belt at the time of the collision of the vehicle, so that the occupant is securely fixed to the seat before moving forward. It is. In FIG. 9, a center pillar 23 is erected in the vicinity of the center of the side sill 13 in the vehicle longitudinal direction.

(7) As shown in FIG. 3, the cross member 15 is provided with a recessed portion 15d having a floor frame 18 intersecting with the cross member 15 on the upper surface, and the floor frame 18 is disposed in the recessed portion 15d. It was set as the structure.

With this configuration, the floor frame 18 is disposed and coupled to the recessed portion 15d of the cross member 15 in a cross shape, so that the raising member is disposed in the recessed area defined by the cross member 15 and the floor frame 18. The floor of the passenger compartment can be formed flat. Further, since the cross member 15 in the vehicle width direction and the floor frame 18 in the front-rear direction are continuously joined in an intersecting manner, the support rigidity of the seat 1 can be increased and the front and side impact loads can be supported.

(8) As shown in FIG. 10, the recessed portion 15 d of the cross member 15 is convex along the longitudinal direction of the floor frame 18 and the first recess 15 e in which the floor frame 18 intersecting with the cross member 15 is disposed. And a second recess 15f that accommodates the reinforcing bead 18a formed by being bent into a shape, and the floor frame 18 is disposed in the first recess 15e with the reinforcing bead 18a accommodated in the second recess 15f. It was set as the composition.

According to this configuration, even if the reinforcing bead 18a is formed on the floor frame 18, the reinforcing bead 18a is accommodated in the second recess 15f of the cross member 15, and the first recess 15e is crossed with the cross member 15. Since the floor frame 18 is disposed, the floor portion of the passenger compartment can be formed flat by disposing the raising member in the recessed area defined by the cross member 15 and the floor frame 18. Further, since the reinforcing frame 18a can be formed on the floor frame 18 at the intersection between the floor frame 18 and the cross member 15, the thickness of the floor frame 18 is reduced in order to form a flat floor portion of the passenger compartment. Even so, the strength and rigidity can be maintained.

(9) As shown in FIG. 2, a front cross member 14 is provided in front of the cross member 15 in parallel with the cross member 15 and has a larger cross-sectional shape than the cross member 15. The front cross member 15 includes seat

rail fixing portions

14a and 14b that fix the seat rail 1a on both sides.

According to this configuration, since the front cross member 14 having a cross-sectional shape larger than that of the cross member 15 is provided in front of the cross member 15 in the vehicle, the side collision performance is improved. Further, the rear cross member 15 can be reduced in weight because the cross-sectional shape can be reduced. For this reason, the front and

rear cross members

14, 15 can be combined to achieve both weight reduction and improved side impact performance.

As mentioned above, although the vehicle body structure according to the present embodiment has been described, the present invention is not limited to this, and can be appropriately changed without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Seat 1a Seat rail 10 Vehicle 11 Floor panel 12 Tunnel part 13 Side sill 14

Front cross member

14a, 14b, 19 Seat rail fixing part 15 Back cross member 15a One end part of cross member 15b Other end part 15c of cross member Central portion 15d Recessed portion 15e First recess 15f Second recess H1 Height of one end of the cross member H2 Height of the other end of the cross member H3 Height of the center of the cross member FFk Cross flange front flange Fk Cross member Front face Uk Cross member upper face Bk Cross member rear face BFk Cross member rear flange 15t End face of cross member D1 Predetermined length from end face of cross member 16 Tunnel side seat mounting bracket (first bracket)
17 Side sill side seat mounting bracket (second bracket)
17c Positioning hole 17d Inclined surface on the upper surface of the side sill side seat mounting bracket FFb Front flange of the bracket Fb Front surface of the bracket Ub Upper surface of the bracket Bb Rear surface of the bracket BFb Rear flange of the bracket SFb Side flange of the bracket Sb Side surface of the bracket 18 Floor frame 19c Load Transmitter 19d Positioning claw 19d1 Positioning claw tip 19e Base 19f Seat rail mounting nut (nut)

Claims

A floor panel disposed between the tunnel portion and the side sill;
A cross member extending in the vehicle width direction along the floor panel;
A first bracket for seat attachment provided at an end of the cross member on the tunnel side;
A second bracket for seat attachment provided at an end of the cross member on the side sill side,
The floor panel protrudes downward from the tunnel portion and the side sill, and the height of both end portions of the cross member is higher than the height of the central portion of the cross member, and the both end portions are the first and first ends. A seat mounting structure characterized by being connected to two brackets.
Both ends of the cross member and the first and second brackets are
A cross-sectional hat shape integrally including a front surface and a front flange on the vehicle front side, an upper surface on the vehicle upper surface side, and a rear surface and a rear flange on the vehicle rear surface side, the one end of the cross member and the first bracket 2. The seat according to claim 1, wherein both front surfaces and rear surfaces are joined together, and the other end portion of the cross member and the front surfaces and rear surfaces of the second bracket are joined together. Mounting structure.
The first or second bracket is
The front flange, the front surface, the rear surface, and the rear flange are joined to the end portion of the cross member, and the front end side of the side surface that extends from the front surface, the upper surface, and the rear surface extends from the end surface of the cross member. The seat mounting structure according to claim 2, wherein the seat mounting structure is coupled to positions spaced apart in the longitudinal direction.
The first or second bracket is
A base portion having a nut for attaching a seat rail of a seat fixed to the upper surface of the first or second bracket, and bent from an end portion of the base portion and fixed to the front side or the rear side of the first or second bracket The seat mounting structure according to claim 1, further comprising: a seat rail fixing portion having a load transmitting portion.
The seat rail fixing portion is
The load transmitting portion of the base portion is bent and extended from an end portion at a position different from the end portion where the load transmitting portion is bent, and a tip portion notched in a concave shape is a positioning hole formed on the upper surface of the first or second bracket. The seat mounting structure according to claim 4, further comprising a positioning claw portion disposed at a position.
The second bracket is
5. The vehicle according to claim 4, further comprising an inclined surface in which an upper surface on a vehicle side surface than an attachment portion of the seat rail on which the seat rail fixing portion is disposed is inclined downward toward the vehicle side surface. Seat mounting structure.
The cross member has a recessed portion on the upper surface,
The seat mounting structure according to claim 1, wherein a floor frame that intersects with the cross member is disposed in the recessed portion.
The recessed portion is
A first recess for disposing the floor frame intersecting with the cross member;
A second recessed portion capable of accommodating a reinforcing bead formed by being bent in a convex shape along the longitudinal direction of the floor frame,
The seat mounting structure according to claim 7, wherein the floor frame is disposed in the first recess while the reinforcing bead is accommodated in the second recess.
A front cross member that extends in parallel with the cross member and has a larger cross-sectional shape than the cross member is provided in front of the cross member.
The seat mounting structure according to claim 1, wherein the front cross member includes a seat rail fixing portion that fixes the seat rail on both sides.