JPH0712193Y2 - Car floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a floor structure of an automobile, and more particularly, to a significantly strengthened support structure for supporting a belt anchor portion.

[Conventional technology]

Generally, a floor tunnel that projects toward the passenger compartment is formed in the center of a floor panel of an automobile in the front-rear direction, and a prop shaft is disposed below the floor tunnel.
The propeller shaft is supported by a center bearing in the front-rear central portion of the floor tunnel, but in the vicinity of the floor tunnel where the center bearing is mounted,
A pair of left and right frame members for reinforcement are arranged in the front-rear direction and joined to the floor panel. On the other hand, in order to increase the panel rigidity of the floor panel, the floor panel is provided with a plurality of cross members.

Regarding the joint structure of the joint flanges of the frame member and the cross member at the intersection, the structure in which the end portion of one joint flange is superposed on the other joint flange and joined to the lower surface of the floor panel is generally adopted. .

On the other hand, at least one lower end portion of the seat belt is fixed to the floor panel via the seat belt anchor plate, but since a large load acts on the seat belt in the event of an automobile collision, the floor panel to which the seat belt anchor plate is fixed is attached. A structure is adopted in which an anchor nut plate for reinforcement is joined to a part or a wheel house inner part, and a seat belt anchor plate is fixed to a portion reinforced by this anchor nut plate. In this case, there are problems that the anchor nut plate mounting structure becomes complicated, the number of members increases, and sufficient strength and rigidity cannot be obtained.

Therefore, in Japanese Utility Model Publication No. 56-44599, the joint flange of the side frame is extended toward the wheel house inner side in the vicinity of the wheel house inner of the rear wheel to form a wide flange portion, and the bottom side of the wide flange portion is formed. A seat belt belt in which a spring seat bracket for receiving a coil spring of a suspension is joined to a seat belt, and a seat belt mounting bracket is fixed to a portion where the floor panel, the wide flange portion and the spring seat bracket are joined together in three layers. An end fixing structure is described.

[Problems to be solved by the invention]

In the joint structure of the joint flanges of the frame member and the cross member at the intersection as in the prior art, one end of the joint flange is superposed on the other joint flange and spot welded to the lower surface of the floor panel. However, there is a drawback that the joint strength of the joint flanges of both is not sufficient. The belt end fixing structure described in the above publication has a drawback that it cannot be applied to the belt end fixing structure of the seat belt of the front seat because the spring seat bracket associated with the rear wheel suspension is utilized.

An object of the present invention is to provide an automobile floor structure capable of significantly strengthening a belt anchor portion.

[Means for solving problems]

A vehicle floor structure according to the present invention comprises a floor panel,
The floor panel is provided with a pair of side wall portions projecting inward from the general plane portion of the floor panel and upper wall portions extending to the upper ends of both side wall portions, and has a substantially inverted U-shaped cross section in the vehicle front-rear direction. One of the flanges is joined to the extending tunnel portion and the general plane portion of the floor panel, the other flange is joined to the upper wall portion of the tunnel portion, and the frame member extends in the vehicle front-rear direction, and the general plane portion of the floor panel. Is joined to the general flat surface of the floor panel by superimposing a portion of the flange portion on the general flat portion of the floor panel and is orthogonal to the tunnel portion in the vehicle width direction. A reinforcement member that is superposed and joined to the extended cross member and the overlapping portion of the above-mentioned general flat portion of the floor panel, the flange of the frame member and the flange portion of the cross member. And bets, in which a seat belt member connected to the reinforcement.

[Action]

In the vehicle floor structure of the present invention, the reinforcement is superposed and joined to the overlapping portion of the floor panel, the flange of the frame member and the flange portion of the cross member, and the seat belt member is connected to the quadruple overlapping portion. Therefore, the strength of the belt anchor portion can be sufficiently strengthened.

Moreover, since one flange of the frame member is joined to the general flat surface portion of the floor panel and the other flange of the frame member is joined to the upper wall portion of the tunnel portion, the load applied from the seat belt member to the frame member is reduced. ,
Since it can be shared by the side wall of the tunnel,
The strength of the belt anchor portion can be remarkably improved by effectively utilizing the highly rigid tunnel portion.

[Effect of device]

According to the floor structure of an automobile according to the present invention, as described above, the reinforcement is polymerized and bonded to the overlapping portion of the floor panel, the flange of the frame member and the flange of the cross member. Since the seat belt member is connected to the overlapping part, the strength of the belt anchor part can be sufficiently strengthened, and by joining one flange of the frame member to the upper wall part of the tunnel part, the belt anchor part can be connected to the frame member. The load acting can also be shared by the tunnel portion, and the strength of the belt anchor portion can be remarkably strengthened by effectively utilizing the tunnel portion.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2, a floor tunnel 2 projecting toward the passenger compartment is formed in the center of a floor panel 1 of the automobile in the front-rear direction, and below the floor tunnel 2. A propeller shaft is provided.

The floor tunnel 2 is a general flat portion of the floor panel 1.
A pair of side wall portions 2a projecting toward the vehicle interior from 1a and an upper wall portion 2b extending over the upper ends of both side wall portions 2a are formed in a substantially U-shaped cross section.

Side sills 3 having a closed cross-section are provided on both left and right edges of the floor panel 1.

In order to increase the panel rigidity of the floor panel 1, a groove-type side frame 4 is joined to the lower surface of the general flat surface portion 1a of the floor panel 1 between the floor tunnel 2 and each side sill 3 so as to form a closed cross section. At a position corresponding to the front portion of the front seat 5, a third cross member 6 having a large downward groove type cross section is joined to the upper surface of the floor panel 1 so as to form a closed cross section. A fourth cross member 7 having a groove-shaped cross section is joined to the lower surface of the general flat surface portion 1a of the floor panel 1 so as to form a closed cross section at a position corresponding to the rear end, and a position corresponding to the front part of the rear seat. At the lower surface of the general flat surface portion 1a of the floor panel 1, a fifth cross member 8 having a groove-shaped cross section is joined so as to form a closed cross section.

A center bearing 9 for supporting a substantially central portion of the propeller shaft arranged below the floor tunnel 1 in the front-rear direction.
In order to mount and reinforce (see FIG. 3), a pair of left and right frame members 10 extending in the front-back direction over the fourth cross member 7 and the fifth cross member 8 are provided along the floor panel 2 along the floor panel 2. 1 is joined to the lower surface.

As shown in FIGS. 2 and 3, each frame member 10 is an inverted trapezoidal open cross-section member, and the joint flange 10a on the vehicle width center side of the pair of joint flanges 10a and 10b at the upper edge is the floor. The joint flange 10b, which is joined to the lower surface of the upper wall portion 2b of the tunnel 2 and is outside the vehicle width, is joined to the lower surface of the general flat surface portion 1a of the floor panel 1 near the floor tunnel 2, and each frame member 10 and the floor panel 1 are connected to each other. To form a closed cross section, the front end of each frame member 10 is joined to the rear end surface of the fourth cross member 7 via a joint flange (not shown), and the rear end is joined to a joint flange (not shown). Is joined to the front end face of the fifth cross member 8.

The frame member 10 inclines outward in the vehicle width direction in a plan view from the central portion in the lengthwise direction to the front end, and the width thereof also gradually increases, and the space between the front portions of the left and right frame members 10 is shown in FIG. As shown, a center bearing 9 is mounted, and a propeller shaft 11 is supported by the center bearing 9. As shown in FIG. 2, FIG. 4, and FIG.
At the intersection of the frame member 10 and the fourth cross member 7, the outer joint flange 10b of the frame member 10 is superposed on the lower surface of the rear joint flange 7a of the fourth cross member 7, and these joint flanges 7a, 10b and A reinforcement 12 having a trapezoidal shape in plan view is arranged on the lower surface of the joint flange 10b in the rearward vicinity thereof, and these are joined to the floor panel 1.

On the outer peripheral portion of the reinforcement 12 is integrally formed a reinforcing flange portion 12a extending downward by a predetermined dimension.

A bolt hole 13 is formed in the reinforcement 12 approximately at the center thereof so as to extend over the reinforcement 12, the joint flange 10b and the floor panel 1, and the bolt hole 13 is formed at a position corresponding to the reinforcement 12. A belt anchor plate 14 is disposed on the upper surface, and the belt anchor plate 14 is fixed to the floor panel 1 by bolts 15 and nuts 16 inserted through the bolt holes and the bolt holes 13 from above. A lower end portion of a buckle member 17 which constitutes a seat belt member of the front seat 5 is connected to a bracket 14a rising from an outer edge of the seat 14.

As described above, in the floor structure, the joint portion (corresponding to the overlapping portion) between the general flat surface portion 1a of the floor panel 1, the joint flange 10b of the frame member 10 and the joint flange 7a of the fourth cross member 7 is provided. Reinforcement 12
Since it is strongly reinforced with, the joint strength between the frame member 10, the fourth cross member 7 and the floor panel 1 is enhanced. Since the belt anchor plate 14 is fixed to the quadruple joint portion reinforced by the reinforcement 12, the support strength of the belt anchor portion is increased.

The reinforcement 12 has a function of increasing the joint strength between the floor panel 1, the fourth cross member 7 and the frame member 10 and a function of reinforcing the belt anchor portion.

Moreover, the joint flange on the vehicle width center side of the frame member 10
Since 10a is joined to the upper wall portion 2b of the floor tunnel 2 and the joining flange 10b on the outer side of the vehicle is joined to the general flat surface portion 1a of the floor panel 1, the load acting on the frame member 10 from the belt anchor plate 14 is increased. Since it can be shared by the rigid floor tunnel 2, the support strength of the belt anchor portion is significantly increased.

Thus, according to the floor structure, the floor panel 1
The floor panel 1 and the frame member 10 have a simple structure in which the reinforcement 12 is superposed and joined to a triple joint between the joint flange 10b of the frame member 10 and the joint flange 7a of the fourth cross member 7. And the fourth cross member 7 and the support strength of the belt anchor portion can be increased and the floor tunnel 2
Can be effectively utilized to remarkably enhance the support strength of the belt anchor portion.

In addition, the above-mentioned reinforcement 12 is the joint flanges 10b and 7
It suffices that it is provided so as to extend over a, and that it may be of a large size so as to reinforce the joining flanges 10b and 7a and the vicinity thereof in a wider range.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partial perspective view of a floor panel of an automobile, FIG. 2 is a plan view of a main portion of the floor panel, and FIG. 3 is a sectional view taken along line III-III of FIG. Figure, 4th
Fig. 2 is a cutaway plan view of an arrow IV in Fig. 2, and Fig. 5 is VV in Fig. 4.
It is a line sectional view. 1 ... Floor panel, 1a ... general plane part, 2 ... floor tunnel, 2a ... side wall part, 2b ... upper wall part, 7 ... fourth cross member, 7a ... joint flange, 10 ... frame Member, 10a …… Joining flange, 12 …… Reinforcement, 17 …… Seat belt member.

Claims (1)

[Scope of utility model registration request] 1. A cross-section substantially comprising a floor panel, a pair of side wall portions provided on the floor panel and projecting inward from a general plane portion of the floor panel, and upper wall portions extending to upper ends of both side wall portions. A frame member, which has an inverted U-shape and extends in the vehicle front-rear direction, and one flange is joined to the general flat surface portion of the floor panel, and the other flange is joined to the upper wall portion of the tunnel portion and extends in the vehicle front-rear direction. And the flange portion is joined to the general flat surface portion of the floor panel, and a part of the flange portion is superposed on the joint portion for joining the frame member to the general flat surface portion of the floor panel and joined to the tunnel portion. A cross member that extends orthogonally to the vehicle width direction and overlaps with the overlapping portion between the general flat surface portion of the floor panel, the frame member flange, and the cross member flange portion. An automobile floor structure comprising: a reinforcement that is joined together and a seat belt member that is connected to the reinforcement.