JPH0537661U - Lower car body structure - Google Patents

Abstract

(57) [Summary] [Object] To provide a lower vehicle body structure of an automobile capable of improving the strength and rigidity of a floor panel with a simple structure and greatly improving the supporting rigidity of a seat device and a seat belt anchor. [Structure] A fourth cross member 14A joined to a rear floor 6 and having at least a partially closed cross-sectional structure in the vehicle width direction.
And a fifth cross member 16A having a closed cross-sectional structure in the vehicle width direction which is joined to a portion of the rear floor 6 that is behind the fourth cross member 14A by a predetermined distance, and a fourth cross member which is joined to the rear floor 6 14A and the fifth cross member 16A are connected to each other, and a floor reinforcing member 17 in the vehicle front-rear direction is provided, and an anchor reinforcing member 21 for the seat belt anchor 9 and a second seat attaching member 20 for the rear seat device 8 are provided. In the vicinity of the connecting portion between the cross members 14A and 16A and the floor reinforcing member 17, the floor reinforcing member 17 or the fourth cross member 14A or the fifth cross member 16A was fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lower body structure of an automobile, and more particularly to a lower body structure of an automobile near a mounting portion of a seat device and a seatbelt anchor.

[0002]

[Prior Art]

 Generally, a plurality of cross members having a closed cross section in the vehicle width direction are provided on the upper surface side or the lower surface side of an automobile floor panel, and these multiple cross members ensure sufficient strength and rigidity of the floor panel. Configured. On the other hand, the seat device and seat belt anchor are firmly fixed to the cross member and floor panel via a reinforcing plate so as to receive the inertial force acting on the occupant during a collision. Particularly, in an automobile with a chassis frame, for example, as described in Japanese Utility Model Publication No. 1-104875, both ends of a cross member provided on a rear floor extend in the front-rear direction of a vehicle like a monocoque automobile. Since it is not fixed to a rear frame with a closed cross section that has strength and rigidity, it is necessary to sufficiently enhance the supporting rigidity of the seat belt anchor of the rear seat device and the rear seat device.

[0003]

[Problems to be solved by the device]

 When fixing the seat device or seatbelt anchor via the reinforcing plate as described above, the load acting on the seat device or seatbelt anchor at the time of a collision is dispersed and absorbed by the floor panel via the reinforcing plate. Reinforcement plate needs to be thick and large in size, multiple reinforcement plates for seat device and seat belt anchor are required, and reinforcement plate itself contributes to improvement of strength and rigidity of floor panel Therefore, there is a problem that it is necessary to increase the number of reinforcing members such as cross members for reinforcing the floor panel separately.

An object of the present invention is to provide a lower vehicle body structure of an automobile which can improve the strength and rigidity of a floor panel with a simple structure and can greatly improve the supporting rigidity of a seat device and a seat belt anchor. Is.

[0005]

[Means for Solving the Problems]

 A lower vehicle body structure for an automobile according to claim 1, wherein a floor panel constituting a vehicle body floor, a first cross member joined to the floor panel and having at least a partially closed cross-section structure in a vehicle width direction, and the floor. A second cross member having a closed cross-section structure facing in the vehicle width direction, which is joined to a portion of the panel that is located a predetermined distance rearward from the first cross member, and the first cross member and the second cross member which are joined to the floor panel. And a floor reinforcing member facing the front-rear direction of the vehicle body, which is connected to the cross member, and a floor reinforcing member or a first cross member in the vicinity of a connecting portion between the first cross member and the second cross member and the floor reinforcing member. Alternatively, it is provided with an anchor reinforcement fixed to the second cross member and fixedly supporting the seat belt anchor. .

A lower body structure for an automobile according to a second aspect is the lower body structure for an automobile according to the first aspect, in which the floor reinforcing member or the first cross member or the second cross member is provided in the vicinity of the connecting portion. The seat mounting member for fixing and supporting the seat device to the floor panel is fixed.

A lower vehicle body structure for an automobile according to a third aspect is the lower vehicle body structure for an automobile according to the first aspect, wherein the anchor reinforcement is constituted by a floor reinforcing member.

[0008]

[Action]

 In the lower body structure for an automobile according to claim 1, a first cross member of at least partially closed cross-section structure facing in the vehicle width direction, and a closed cross section facing backward in the vehicle width direction at a predetermined distance from the first cross member. The second cross member of the structure is connected by a floor reinforcing member in the front-rear direction of the vehicle body, and the first cross member, the second cross member and the floor reinforcing member are respectively joined to floor panels constituting the vehicle body floor. Therefore, the strength and rigidity of the floor panel can be sufficiently increased with a small number of members. Moreover, the anchor reinforcement for fixing and supporting the seat belt anchor has the floor reinforcing member, the first cross member, or the second reinforcing member near the connecting portion between the first cross member and the second cross member and the floor reinforcing member. Since it is fixed to the cross member of the seat belt anchor, the load acting on the seat belt anchor can be received via the first and second cross members, which have high strength and rigidity, and the floor reinforcing member. The support rigidity of the vehicle can be greatly improved to further improve the safety of passengers.

In the lower vehicle body structure for an automobile according to claim 2, basically the same operation as in claim 1 can be obtained, but the seat mounting member for fixing and supporting the seat device to the floor panel has a connecting portion. Since it is fixed to the floor reinforcing member, the first cross member, or the second cross member in the vicinity, the load applied from the seat device to the seat mounting member is applied to the first cross member and the second cross member having high strength and rigidity. Since it can be received through the member and the floor reinforcing member, the supporting rigidity of the seat device can be greatly improved.

In the lower body structure of the automobile according to claim 3, basically the same action as that of claim 1 can be obtained, but since the anchor reinforcement is constituted by the floor reinforcing member, the part is increased accordingly. The manufacturing cost can be reduced by reducing the number of points.

[0011]

[Effect of the device]

 The following effects are obtained as described in the section of the operation. According to the lower vehicle body structure of an automobile of claim 1, the first cross member and the second cross member are connected by the floor reinforcing member, and the first cross member, the second cross member, and the floor reinforcing member are connected to each other. With the simple structure of joining to the floor panel, the strength and rigidity of the floor panel can be sufficiently increased with a small number of members. Moreover, the anchor reinforcement can be received through the first cross member and the second cross member, which have high strength and rigidity, and the floor reinforcing member, so that the supporting rigidity of the seat belt anchor is significantly improved and the occupant can be greatly improved. The safety of can be further improved.

In the lower body structure for an automobile according to claim 2, basically the same effect as that of claim 1 can be obtained, but the seat mounting member for fixing and supporting the seat device to the floor panel is the connecting portion. Since it is fixed to the floor reinforcing member, the first cross member, or the second cross member in the vicinity, the load applied from the seat device to the seat mounting member is applied to the first cross member and the second cross member having high strength and rigidity. Since it can be received through the member and the floor reinforcing member, the supporting rigidity of the seat device can be greatly improved.

In the lower body structure of the automobile according to claim 3, basically the same effect as in claim 1 can be obtained, but since the anchor reinforcement is constituted by the floor reinforcing member, the part is increased accordingly. The manufacturing cost can be reduced by reducing the number of points.

[0014]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. This embodiment is a case where the present invention is applied to a lower body structure of an automobile with a chassis frame. In addition, in the present embodiment, the front, rear, left and right of the vehicle will be defined and described. As shown in FIGS. 1 to 3, a lower vehicle body structure of an automobile will be described. A chassis frame 2 is provided below a body body 1 of the automobile, and the body body 1 is connected via a cab mount device 3 to the chassis frame 2. 2 is elastically supported by 2, and a front floor 4, a center floor 5, and a rear floor 6 are provided at the lower part of a body 1 that composes the passenger compartment, and the rear half of the center floor 5 is one step deeper than the front floor 4. A high seat receiving portion 7 is formed in a protruding shape, a pair of left and right separate type rear seat devices 8 are provided on the seat receiving portion 7, and a pair of left and right seat belt anchors is provided substantially in the center of the seat receiving portion 7. 9 is attached, a fuel tank 10 is disposed below the seat receiving portion 7, and a vertical wall portion 7a having a substantially U-shaped plan view extending downward is formed at a front end portion of the seat receiving portion 7. On the lower surface side of the center floor 5, there is provided an inverted L-shaped third cross member main body 11 that extends over the vertical wall portion 7a and the seat receiving portion 7, and is closed by the center floor 5 and the third cross member main body 11. A third cross member 11A having a sectional structure is formed. Reference numeral 13 is a filler pipe for supplying fuel into the fuel tank 10.

As shown in FIGS. 2 to 4, the center floor 5 and the rear floor 6 are provided at a predetermined distance in the front and rear, and an inverted L-shaped fourth cross member body is provided between the floors 5 and 6. 14 is provided, the rear floor 6 is disposed at a position one step higher than the center floor 5 via the vertical wall portion 14a of the fourth cross member main body 14, and the joint flange portion on the front side of the fourth cross member main body 14 is provided. 14b extends below the rear end of the center floor 5 and is joined to the center floor 5, and the connecting flange 14c on the rear side of the fourth cross member main body 14 extends below the front end of the rear floor 6. An inverted L-shape that extends and is joined to the rear floor 6 and that is below the approximately central portion of the fourth cross member body 14 and has a length of approximately 1/3 of the fourth cross member body 14 in the vehicle width direction. The closing plate 15 is provided, the front flange portion 15a of the closing plate 15 is joined to the center floor 5 together with the joining flange portion 14b, and the rear flange portion 15b of the closing plate 15 is joined to the lower surface of the center floor 5 together with the joining flange portion 14c. The closing plate 15 and the fourth cross member main body 14 partially form a fourth cross member 14A (which corresponds to the first cross member) having a closed cross-sectional structure in the vehicle width direction. A fifth cross member main body 16 having a substantially U-shaped cross section is provided on the lower surface side of the substantially central portion in the direction, and is composed of the rear floor 6 and the fifth cross member main body 16 (which corresponds to the second cross member). A fifth cross member 16A having a closed cross-sectional structure facing the vehicle width direction with a predetermined distance behind the four cross member 14A. A pair of left and right floor reinforcing members 17 for connecting the left and right ends of the fourth cross member 14A and the fifth cross member 16A are provided on the lower side of the rear floor 6 in the vehicle front-rear direction. There is.

Since the left and right floor reinforcing members 17 have a symmetrical structure, the right one will be described. As shown in FIG. 4, the floor reinforcing member 17 basically has a vertical wall portion 17a extending in a substantially vertical direction. An upper flange portion 17b extending inward (leftward) from the upper end of the vertical wall portion 17a and a lower flange 17c extending outward from the lower end of the vertical wall portion 17a are formed into a substantially crank shape in cross section. Thus, a front flange portion 17d extending outward (to the right side) is formed at the front end portion of the vertical wall portion 17a, and a rear flange portion 17e extending inward is formed at the rear end portion of the vertical wall portion 17a. As shown in FIG. 4, the left and right floor reinforcing members 17 are respectively joined to the rear floor 6 via the upper flange portion 17b, and the front flange portion 17d and the lower portion of the upper flange portion 17b are connected to the rear floor 6. Fuller And the left and right ends of the fourth cross member 14A through the flange 15c of the closing plate 15 and the vicinity of the front end of the flange 17c. The rear flange 17e, the lower end of the lower flange 17c, and the upper flange of the lower flange 17c. The fifth cross member 16A is joined to the fifth cross member 16A via the rear end portion of 17b.

The mounting structure of the seat backs 18 of the left and right rear seat devices 8 will be described. As shown in FIGS. 2 and 4, the first seat mounting members are provided at both ends of the fourth cross member body 14. 19 is fixed, and a pair of left and right second seat mounting members 20 is provided at a position corresponding to the floor reinforcing member 17 of the fourth cross member main body 14, and the second seat mounting member 20 serves as the fourth cross member main body 14. It is fastened to the upper flange portion 17b of the floor reinforcing member 17 via bolts (not shown), and the left and right seat backs 18 are fixedly supported by the vehicle body via both seat mounting members 19 and 20, respectively.

The attachment structure of the left and right seat belt anchors 9 will be described. As shown in FIGS. 2, 4, and 5, the closing plate 15 is provided near the connecting portion between the fourth cross member 14A and the floor reinforcing member 17. An anchor reinforcement (hereinafter, simply referred to as an anchor reinforcing member) 21 is provided over the lower surface near the left and right ends and the lower surface near the rear end of the center floor 5, and the anchor reinforcing member 21 has a substantially flat plate shape. The upper wall portion 21a, the reinforcing flange portion 21b extending downward from the outer edge portion of the upper wall portion 21a, and the flange portion 21c extending outward from the lower end portion of the reinforcing flange portion 21b are provided. Is joined to the center floor 5 together with the flanges 14b and 15a, and the rear half of the upper wall 21a is the lower end of the closing plate 15. The anchor reinforcing member 21 is firmly joined to the fourth cross member 14A, the floor reinforcing member 17, and the center floor 5 by being joined to the portion near the outer end of the surface and the portion near the front end of the lower flange portion 17c. The seat belt anchor 9 is fastened to the upper wall portion 21a and the center floor 5 via bolts.

Next, the operation of the lower body structure of the automobile will be described. The fourth cross member 14A and the fifth cross member 16A are connected via a pair of left and right floor reinforcing members 17, and both cross members 14A and 16A and a pair of left and right floor reinforcing members 17 are attached to the rear floor 6. Since they are joined together, the strength and rigidity of the rear floor 6 can be increased to prevent the generation of vibration and noise due to the membrane vibration of the rear floor 6, and the load at the time of a rear collision can be effectively reduced by the left and right floor reinforcement members 17. The safety of passengers can be further improved by absorbing it. Moreover, the floor reinforcing member 17 extending in the front-rear direction of the vehicle body can effectively prevent the fuel tank 10 from being damaged during a rear-end collision. The fourth cross member 14A and the fifth cross member 16A, which have high strength and rigidity, and the pair of left and right floor reinforcing members 17 are joined in a frame shape, and the seat back is attached to the fourth cross member 14A and the floor reinforcing member 17. Since the second seat attachment member 20 and the anchor reinforcement member 21 for attaching the seat belt anchor 9 are fixed, the load acting on the seat back 18 and the seat belt anchor 9 at the time of collision is effectively applied to the rear floor 6. It can be dispersed and absorbed, and the support rigidity of the seat back 18 and the seat belt anchor 9 to the vehicle body can be greatly improved. Therefore, it is not necessary to provide a reinforcing plate or the like to increase the support rigidity of the seat back 18 and the seat belt anchor 9 with respect to the vehicle body, and the number of parts can be greatly reduced.

As described above, it is possible to increase the strength and rigidity of the rear floor 6 with a simple structure to prevent the generation of vibration and noise due to the membrane vibration of the rear floor 6, and to reduce the load at the time of a rear-end collision on the left and right floors. It can be effectively absorbed by the reinforcing member 17 to further improve the occupant's safety, the fuel tank 10 can be effectively prevented from being damaged during a rear-end collision, and the seatback 18 and the seatbelt anchor 9 can be protected from the collision. The acting load can be effectively dispersed and absorbed on the rear floor 6, and the support rigidity of the seat back 18 and the seat belt anchor 9 to the vehicle body can be significantly improved. Can be significantly reduced, and other effects can be obtained.

The anchor reinforcement member 21 is omitted, and front and rear flange portions 17D extending inward are provided at the front end portions of the left and right floor reinforcement members 17 as shown by phantom lines in FIG. May be directly fixed to the front flange portion 17D and the vertical wall portion 14a of the fourth cross member body 14. In this embodiment, the floor reinforcing member 17 has a substantially crank-shaped cross section, but may have a substantially U-shaped cross section. Although the fourth cross member 14A and the fifth cross member 16A are connected by the pair of left and right floor reinforcing members 17 in this embodiment, other adjacent cross members may be connected to each other. .. Although the present invention is applied to a vehicle with a chassis frame in this embodiment, the present invention can be similarly applied to a monocoque type vehicle.

[Brief description of drawings]

FIG. 1 is a perspective view of an automobile with a chassis frame.

FIG. 2 is a perspective view of the vicinity of a center floor and a rear floor.

FIG. 3 is a plan view of the vicinity of a center floor and a rear floor.

FIG. 4 is a perspective view of essential parts near a floor reinforcing member.

5 is a sectional view taken along line 5-5 of FIG.

[Explanation of symbols]

 6 Rear Floor 8 Rear Seat Device 9 Seat Belt Anchor 14A Fourth Cross Member 16A Fifth Cross Member 17 Floor Reinforcing Member 17D Front Flange 20 Second Seat Attaching Member 21 Anchor Reinforcement

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Ryuji Matsumura 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (3)

[Scope of utility model registration request] 1. A floor panel constituting a vehicle body floor, a first cross member joined to the floor panel and having at least a partially closed cross-section structure in a vehicle width direction, and a first of the floor panels. A second cross member having a closed cross-section structure in the vehicle width direction, which is joined to a portion behind the cross member by a predetermined distance, and a second cross member joined to the floor panel and connecting the first cross member and the second cross member. A floor reinforcing member facing the front-rear direction of the vehicle body, and fixed to the floor reinforcing member or the first cross member or the second cross member in the vicinity of a connecting portion between the first cross member and the second cross member and the floor reinforcing member. Lower vehicle body structure of an automobile including anchor reinforcement for fixedly supporting a seat belt anchor 2. A seat mounting member for fixing and supporting a seat device to a floor panel is fixed to the floor reinforcing member, the first cross member or the second cross member in the vicinity of the connecting portion. The lower body structure of the automobile according to Item 1. 3. The anchor reinforcement is composed of a floor reinforcing member.
The lower body structure of the automobile described in.