JP3102508B2 - Car rear body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear body structure of a vehicle having a chassis frame, and more particularly to a vehicle having a rear floor provided with a reinforcing frame oriented in a vehicle front-rear direction.

[0002]

2. Description of the Related Art Conventionally, an automobile with a chassis frame in which a body main body constituting a vehicle compartment is supported by a chassis frame via a plurality of cab mount brackets has been put to practical use. Usually, in an automobile with the chassis frame,
The strength and rigidity of the chassis frame are sufficiently increased to absorb the impact at the time of collision, and the strength and rigidity of the body are set relatively low. For this reason, the rear floor or the like usually has a strength of 2 to 3 to secure the strength and rigidity required to support the weight of the occupant and the seat device.
Although a cross member of the book is provided, a vertical strength frame oriented in the front-rear direction is not provided. On the other hand, in order to increase the strength and rigidity of the front floor and increase the joint strength between the front floor and the rear floor, for example,
Japanese Patent Publication No. 186686 discloses that a tunnel reinforcement is provided near the rear end of a shaft tunnel along the upper surface thereof, and both left and right ends of the tunnel reinforcement are extended outward along a front floor to form a front floor. A lower vehicle body structure of an automobile is described which is joined to an upper surface and has a rear end extending along a step between a front floor and a rear floor and joined to a front end face of the step.

[0003]

As described above, in a vehicle with a chassis frame, the strength and rigidity of the rear floor are set to be relatively low, and the rear floor is formed in a large panel shape over substantially the entire width of the vehicle. The rigidity of the vehicle body is low, the rear floor membrane vibrates during high-speed driving, and the quietness in the passenger compartment is reduced. Depending on the collision state, such as in the case of a rear collision, the impact of the collision is not sufficiently absorbed by the chassis frame and transmitted to the rear floor. There is a problem that the fuel tank disposed below the rear floor is likely to be affected by the deformation of the fuel tank.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rear body structure of a vehicle having a chassis frame, particularly a rear floor structure capable of enhancing the strength and rigidity of a rear floor and improving protection for a fuel tank.

[0005]

According to a first aspect of the present invention, there is provided a rear body structure of an automobile having a recessed cross-section extending in the vehicle longitudinal direction at a central portion in a vehicle width direction of a rear floor of the vehicle body of the automobile with a chassis frame. A reinforcing section having a convex cross section that covers the upper side of the reinforcing section, and the reinforcing section and the reinforcing plate extend rearward from a fuel tank disposed below a rear floor. Is formed.

According to a second aspect of the invention, there is provided a rear body structure of an automobile.
2. The rear body structure of an automobile according to claim 1, wherein the reinforcing plate is provided with a front extension that extends forward from a front end of a rear floor and forms a closed cross section in cooperation with a shaft tunnel of the front floor. It is.

According to a third aspect of the present invention, there is provided a rear body structure of an automobile,
3. The rear body structure of an automobile according to claim 2, wherein the reinforcing frame comprises a partition wall for partitioning the inside of the reinforcing frame in a transverse direction and a flange integrally formed on an outer peripheral portion of the partition wall. A member is provided.

According to a fourth aspect of the present invention, there is provided a rear body structure of an automobile,
The rear body structure of an automobile according to claim 1, wherein a rear end of the reinforcing plate is joined to a cross member provided near a rear end of a rear floor.

According to a fifth aspect of the present invention, there is provided a rear body structure of an automobile,
2. The rear body structure of an automobile according to claim 1, wherein the reinforcing plate is provided with an opening through which articles in the reinforcing frame enter and exit, and a lid member capable of opening and closing the opening.

According to a sixth aspect of the present invention, there is provided a rear body structure of an automobile,
In a rear body structure of a vehicle body of a vehicle with a chassis frame, a reinforcing portion having a convex cross-section extending in the vehicle front-rear direction is provided at a central portion in a vehicle width direction of a rear floor, and a reinforcing plate having a concave cross-section for closing below the reinforcing portion is provided. The reinforcing section and the reinforcing plate form a closed-section reinforcing frame extending rearward of a fuel tank disposed below a rear floor.

[0011]

In the vehicle rear body structure according to the first aspect of the present invention, a reinforcing portion having a concave cross-section and extending in the vehicle front-rear direction is provided at a central portion in a vehicle width direction of a rear floor of the vehicle with a chassis frame, and a portion above the reinforcing portion. A reinforcing frame with a closed cross section is formed by the reinforcing plate with a convex cross section that closes, and the strength and rigidity of the rear floor are increased by this reinforcing frame, so that the membrane vibration of the rear floor during high-speed running can be reduced, and quietness in the vehicle interior Can be improved. Further, since the reinforcing frame having a closed cross section is extended to the rear of the fuel tank disposed below the rear floor, the collision energy at the time of a rear collision can be effectively absorbed by the chassis frame and the reinforcing frame. The protection performance for the tank can be improved. Since the reinforcing frame is formed by the reinforcing portion having the concave cross section and the reinforcing plate having the convex cross section, the reinforcing frame can be provided by effectively utilizing the space near the upper and lower sides of the rear floor.

In the rear body structure of the vehicle according to the second aspect, basically the same operation as that of the first aspect is obtained,
A front extension that extends forward from the front end of the rear floor is formed on the reinforcing plate, and a closed cross-section is formed by the front extension and the shaft tunnel of the front floor. The rigidity of the vehicle body can be improved by improving the strength and rigidity of the connecting portion, and the reinforcing effect of the reinforcing frame can be improved.

In the rear body structure of an automobile according to the third aspect, basically the same operation as that of the second aspect is obtained.
Since the reinforcing frame is provided with a reinforcing partition member composed of a partition wall portion for partitioning the inside of the reinforcing frame in a transverse shape and a flange portion integrally formed on an outer peripheral portion of the partition wall portion, a reinforcing member having a simple configuration is provided. The strength and rigidity of the reinforcing frame against torsion and bending can be greatly improved by the partition member.

According to the rear body structure of the automobile according to the fourth aspect, basically the same operation as that of the first aspect can be obtained.
Since the rear end of the reinforcing plate is joined to the cross member provided near the rear end of the rear floor, the connection between the reinforcing frame and the cross member is strengthened, and the rigidity of the rear body of the vehicle body can be improved.

In the rear body structure of the vehicle according to the fifth aspect, basically the same operation as in the first aspect can be obtained.
Since the reinforcing plate is provided with an opening for taking articles in and out of the reinforcing frame, and a lid member that can open and close this opening,
Goods such as tools and jacks can be stored by effectively utilizing the space in the reinforcing frame.

According to a sixth aspect of the present invention, there is provided a rear body structure of a vehicle, which is provided at a center portion in a vehicle width direction of a rear floor of the vehicle with a chassis frame and has a convex cross-sectional shape extending in the vehicle front-rear direction. 2. A reinforcing frame having a closed cross section is formed by a reinforcing plate having a concave cross section that closes the fuel tank, and the reinforcing frame having a closed cross section is extended to the rear of a fuel tank disposed below the rear floor. The same operation as is obtained.

[0017]

As described in the above section, the following effects can be obtained. According to the rear body structure of the automobile according to the first aspect, the strength and rigidity of the rear floor can be increased by the reinforcing frame having a closed cross section, and the membrane vibration of the rear floor during high-speed running is reduced, thereby reducing the quietness in the vehicle interior. The reinforcement frame can effectively absorb a part of the collision energy in the event of a rear collision, improve the protection performance against the fuel tank, and effectively utilize the space near the upper and lower sides of the rear floor. The effect of what can be done is obtained.

According to the rear body structure of the vehicle according to the second aspect, basically the same effect as in the first aspect can be obtained, but the closed body formed by the front extension of the reinforcing plate and the shaft tunnel of the front floor. The cross-section improves the strength of the vehicle body by increasing the strength of the connection between the reinforcing frame and the shaft tunnel, thereby improving the reinforcing action of the reinforcing frame.

According to the rear body structure of the automobile according to the third aspect, basically the same effect as that of the second aspect can be obtained, but the reinforcement is achieved by the reinforcement partition member having a simple structure provided in the reinforcement frame. The strength and rigidity of the frame against torsion and bending can be greatly improved.

According to the rear body structure of the automobile according to the fourth aspect, basically the same effect as in the first aspect is obtained, but the rear end of the reinforcing plate is provided near the rear end of the rear floor. Since it is joined to the member, the connection between the reinforcing frame and the cross member is strengthened, and the rigidity of the rear vehicle body can be improved.

According to the rear body structure of the automobile according to the fifth aspect, basically the same effect as in the first aspect can be obtained, except that an opening is formed in the reinforcing plate and this opening can be opened and closed. Since the members are provided, it is possible to effectively utilize the space in the reinforcing frame to store articles such as tools and jacks.

According to the rear body structure of the vehicle according to the sixth aspect, the strength and rigidity of the rear floor can be increased by the reinforcing frame having a closed cross section basically as in the case of the first aspect, and the rear floor during high-speed running can be obtained. The membrane vibration of the vehicle can be reduced to improve quietness in the cabin, a part of the collision energy at the time of a rear collision can be effectively absorbed by the reinforcement frame, and the protection performance against the fuel tank can be improved. The effect that the reinforcement frame can be arranged by effectively utilizing the nearby space can be obtained.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a rear body structure of an automobile having a chassis frame. In this embodiment, the front, rear, left and right are defined and described based on the front, rear, left and right of the vehicle. As shown in FIGS. 1 and 2, a chassis frame 2 is provided below the body 1 of the vehicle, and the left and right sides of the chassis frame 2 extend from the front end to the rear end of the body 1. The left and right side frames 3 are provided with a pair of left and right side frames 3, and the left and right side frames 3 are respectively provided with five cab mount brackets 4 protruding outward, and the body main body 1 is mounted on the chassis via the cab mount bracket 4. It is connected to the frame 2.

The rear body structure of the automobile will be described below. As shown in FIGS. 1 to 4, a front floor 6 and a rear floor 7 are provided at the lower part of a part of the body main body 1 which forms the cabin 5. The left and right ends of the front floor 6 are joined to the side sills 8, and the front floor 6
A shaft tunnel 9 is formed in a protruding shape at a central portion in the vehicle width direction, and a vertical wall portion 7a extending downward is formed near a front end of the rear floor 7, and a front floor 6 is formed at a lower end portion of the vertical wall portion 7a. A joining flange portion 7b extending forward is formed along the rear end portion, and the rear end portion of the front floor 6 is joined to the upper surface of the joining flange portion 7b by being overlapped and extends rearward from the upper end portion of the vertical wall portion 7a. The rear floor main body 7c is disposed substantially horizontally at a position one step higher than the front floor 6, and a rear end cross member 10 is provided below the rear floor main body 7c near the rear end thereof.
Over the vicinity of the front end and the vicinity of the upper end of the vertical wall 7a.
A cross member 11 is provided, and a fuel tank 12 is provided below the rear floor main body 7c.

At the center of the rear floor body 7c in the vehicle width direction, a substantially horizontal lower wall 13a, and an inclined wall 13b extending upward from both left and right ends and a rear end of the lower wall 13a. A reinforcing portion 13 having a concave section is formed from the front end of the rear floor main body 7c to the rear end cross member 10, and a reinforcing plate 14 having a convex cross section that covers the upper portion of the reinforcing portion 13 is provided on the shaft from the rear end of the reinforcing portion 13. The protruding portion is provided over the vicinity of the rear end of the tunnel 9. The reinforcing plate 14 will be described. As shown in FIGS. 1 to 4, a reinforcing plate main body 15 for closing the upper portion of the reinforcing portion 13 is provided at a rear portion of the reinforcing plate 14, and a front portion of the reinforcing plate main body 15 is provided at a front portion. A front extension 16 is provided to extend
Is a substantially horizontal upper wall portion 15a, an inclined wall portion 15b extending downward from both left and right ends and a rear end portion of the upper wall portion 15a, and extending outward from a lower end portion of the inclined wall portion 15b. The left and right flange portions 15c are integrally formed with the flange portions 15c and 15d, and the left and right flange portions 15c are joined to the upper surface of the rear floor main body 7c, and the rear flange portion 15d is connected to the front flange portion 10a of the rear end cross member 10 by the rear floor main body 7c.
And a reinforcing frame 17 having a closed cross section extending to the rear of the fuel tank 12 by the reinforcing plate main body 15 and the reinforcing portion 13.

The front extension portion 16 includes a front wall portion 16a extending downward from the front end portion of the upper wall portion 15a to a rear end portion of the shaft tunnel 9, and a sloped wall portion 15b of the reinforcing plate body 15. A side wall portion 16b extending downward from both left and right ends of the front wall portion 16a, a flange portion 16c extending forward from the front end portion of the front wall portion 16a, and a side wall portion 16b
Substantially vertically oriented flange portion 16 formed at the lower end of the
d, and a flange portion 16e extending laterally from the rear end of the side wall portion 16b. The flange portions 16c and 16d are coupled to the upper wall portion 9a and the side wall portion 9b of the shaft tunnel 9,
The flange 16e is connected to the vertical wall 7a,
The closed cross-section 18 connected to the reinforcing frame 17 is formed by the a, the left and right side walls 16b and the shaft tunnel 9.

In the vicinity of the front end and the rear end of the reinforcing frame 17, as shown in FIGS. 2, 3, and 5, a partition wall 20a for partitioning the reinforcing frame 17 in a transverse shape and the partition wall 20a are provided. 20b integrally formed on the outer peripheral portion of
A pair of front and rear reinforcing partition members 20 consisting of:
The front and rear reinforcing partitioning members 20 are coupled to the inner wall of the reinforcing frame 17 at their flange portions 20b, and a pair of left and right seat belt anchors for the rear seat are provided at positions corresponding to the reinforcing partitioning members 20 on the rear side of the reinforcing frame 17. An accommodation portion 21 is provided in the reinforcing frame 17 between the front and rear reinforcing partitioning members 20 so as to accommodate the equipment S including tools and jacks. Opening 14 for putting equipment S in and out
a and a lid member 23 capable of opening and closing the opening 14a.

Next, the operation of the rear body structure of the automobile will be described. Since the rear floor main body 7c of the vehicle with the chassis frame is constituted by a large panel member having substantially the entire width of the vehicle, the rear floor main body 7c tends to vibrate the membrane at the time of high-speed running or the like. The strength and rigidity of the rear floor main body 7c are increased by the simple construction of the reinforcing frame 17 having a closed cross section, and the membrane vibration of the rear floor main body 7c during high-speed running is reduced, and the quietness of the cabin 5 is ensured. In addition, the front end of the reinforcing frame 17 is connected to the shaft tunnel 9, the vertical wall 7 a, and the third cross member 11 having relatively high strength and rigidity via the closed cross-section 18, so that the reinforcing frame 17 and the shaft tunnel are connected. 9 and the rear end of the reinforcing frame 17 is connected to the rear end cross member 10 having relatively high strength and rigidity, so that the connection between the reinforcing frame 17 and the rear end cross member 10 is strengthened. The reinforcing effect of the reinforcing frame 17 is enhanced. Moreover, since the strength and rigidity against torsion and bending are enhanced by the reinforcing partition member 20 provided inside the reinforcing frame 17, the strength and rigidity of the reinforcing frame 17 are sufficiently ensured. Further, since the reinforcing frame 17 having relatively high strength and rigidity is extended to the rear of the fuel tank 12, a part of the collision energy at the time of a rear collision can be effectively absorbed by the reinforcing frame 17, and the protection performance for the fuel tank 12 can be improved. Can be further improved. In addition, since the reinforcing frame 17 is formed by the reinforcing section 13 having a concave cross section and the reinforcing plate 14 having a convex cross section, the reinforcing frame 17 can be disposed by effectively utilizing the space near the upper and lower sides of the rear floor main body 7c. Further, the equipment S including tools and jacks can be stored by effectively utilizing the space in the reinforcing frame 17. Further, since the seat belt anchor 21 is attached to the portion of the reinforcing frame 17 reinforced by the reinforcing partition member 20, the seat belt anchor 21 can be firmly fixed to the rear floor main body 7c without separately providing a reinforcing member or the like.

As described above, the film vibration of the rear floor main body 7c can be suppressed to improve the quietness of the cabin 5, the protection performance for the fuel tank 12 at the time of a rear collision can be further improved, and the vertical movement of the rear floor main body 7c can be improved. That the reinforcement frame 17 can be disposed by effectively utilizing the space near both sides; that the equipment S such as tools and jacks can be stored by effectively utilizing the space within the reinforcement frame 17; And the effect that the reinforcing member for use can be omitted.

In this embodiment, the flange portion 15d of the reinforcing plate main body 15 is fixed to the front flange portion 10a of the rear end cross member 10. However, as shown by an imaginary line in FIG. May be fixed. In the present embodiment, the reinforcing frame 17 having a closed cross section is formed by the reinforcing section 13 having a concave cross section and the reinforcing plate 14 having a convex cross section. However, as shown in FIG. Reinforcing part 13A
In addition, the reinforcing plate 14 is formed on the reinforcing portion 14A having a concave cross section, the front extension 16 of the reinforcing plate 14 is omitted, and the reinforcing plate 14A is connected to the rear floor main body 7c so as to cover the reinforcing portion 13A from below. , 13 A of convex reinforcing section
The reinforcing frame 17A having a closed cross section may be formed by the reinforcing frame 14A and the reinforcing plate 14A having a concave cross section. The reinforcing frame 17
It is also possible that the cross-sectional dimension of the reinforcing frame 17 is further reduced and reinforcing frames similar to the downsized reinforcing frame 17 are provided on both left and right sides of the reinforcing frame 17 with an interval.

[Brief description of the drawings]

FIG. 1 is a perspective view of a body main body and a chassis frame.

FIG. 2 is an exploded perspective view of a rear body structure.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2 in a state where a reinforcing plate is assembled.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a perspective view of a reinforcing partition member.

FIG. 6 is a view corresponding to FIG. 4 of a rear body structure according to a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body main body 2 Chassis frame 5 Chamber 6 Front floor 7 Rear floor 9 Shaft tunnel 10 Rear end cross member 10a Flange part 10b Flange part 12 Fuel tank 13.13A Reinforcement part 14.14A Reinforcement plate 14a Opening part 16 Front extension part 17 / 17A Reinforcement frame 18 Closed cross section 20 Reinforcement partition member 20a Partition wall portion 20b Flange portion 23 Lid member S Equipment

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushi Nishiyama 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP-A-55-127263 (JP, A) JP-A-2 241882 (JP, A) JP-A-62-205858 (JP, A) JP-A-61-200779 (JP, U) JP-A-55-101670 (JP, U) JP-A-60-173473 (JP, U) ) Japanese Utility Model Showa 60-76564 (JP, U) Japanese Utility Model Showa 61-186686 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (6)

(57) [Claims] 1. A rear body structure of a vehicle body of a vehicle with a chassis frame, wherein a reinforcing portion having a concave section extending in the front-rear direction of the vehicle body is provided at a central portion in a vehicle width direction of a rear floor, and a convex section having a cross section that covers an upper portion of the reinforcing section is provided. A vehicle body structure for a rear part of an automobile, wherein a reinforcing frame is provided, and the reinforcing portion and the reinforcing plate form a closed cross-sectional reinforcing frame extending rearward of a fuel tank disposed below a rear floor. 2. The reinforcing plate according to claim 1, further comprising a front extension extending forward from a front end of a rear floor and forming a closed section in cooperation with a shaft tunnel of the front floor. Rear body structure of the vehicle as described. 3. The reinforcing frame is provided with a reinforcing partition member comprising a partition wall section for partitioning the inside of the reinforcing frame in a transverse shape and a flange section integrally formed on an outer peripheral portion of the partition wall section. The rear body structure of an automobile according to claim 2. 4. The rear body structure of an automobile according to claim 1, wherein a rear end of said reinforcing plate is joined to a cross member provided near a rear end of a rear floor. 5. The vehicle according to claim 1, wherein the reinforcing plate is provided with an opening through which articles in the reinforcing frame enter and exit, and a lid member capable of opening and closing the opening. Rear body structure. 6. A rear body structure of a vehicle body of a vehicle with a chassis frame, wherein a reinforcing portion having a convex cross section is provided at a central portion in a vehicle width direction of a rear floor, and has a convex cross section extending in the front and rear direction of the vehicle, and a concave cross section closing a lower portion of the reinforcing portion. A vehicle body structure for a rear part of an automobile, wherein a reinforcing frame is provided, and the reinforcing portion and the reinforcing plate form a closed cross-sectional reinforcing frame extending rearward of a fuel tank disposed below a rear floor.