JP3180924B2 - Body floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body floor structure.

[0002]

2. Description of the Related Art Conventionally, as a vehicle body floor structure,
There are those as shown in FIGS. In the vehicle body floor structure of FIG. 7, a floor tunnel 72 is provided at the center of the floor panel 71. Inside the floor tunnel 72, a propeller shaft, an exhaust pipe, and the like may be provided depending on the type of vehicle. Normally, the floor tunnel 72 has a small effect of reinforcement against bending and twisting of the vehicle body. Therefore, as shown in FIG. 8, a floor side member 74 is provided between the side sill 73 and the floor tunnel 72 to improve the strength.

[0003]

However, in the above-described conventional structure shown in FIG. 8, it is necessary to increase the floor surface in order to provide the floor side member 74 on the lower surface of the floor, and as a result, the center of gravity increases. There were drawbacks. For this reason, it was not suitable for a sports-type vehicle that required a lower center of gravity. Further, the floor side member 74 has to be reduced in cross-sectional area due to the provision on the lower surface of the floor, and has to be increased in thickness in order to maintain strength, which contributes to an increase in weight. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a vehicle body length on both sides of a floor tunnel.
A tunnel side member extending in the hand direction is provided, a reinforcement extending in the longitudinal direction of the vehicle body is fixed between the tunnel side members, the space inside the floor tunnel is divided into upper and lower spaces, and a propeller shaft is formed in the upper and lower spaces formed. And the exhaust pipe are separately arranged and extend in the longitudinal direction of the vehicle body.
The reinforcements are on the left and right of the floor tunnel
And a vehicle body floor structure connecting the floor panels .

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle floor structure of an automobile according to the present invention.

FIGS. 1 to 4 show a Targa roof type open car type automobile 1 (a type that can be fully opened) provided with an embodiment of a vehicle body floor structure according to the present invention. Is the floor panel, 4 is the side sill, 5 is the tunnel side member, 6
a and 6b are upper and lower reinforcements.

The floor tunnel 2 is connected to a dash cross member 7 at a front end and to a bulkhead lower cross member 8 at a rear end. The floor tunnel 2 is connected to the seat riser member 9 at the center. further,
The dash cross member 7 is connected to a front end member 11 via a front side member 10. The bulkhead lower cross member 8 is
It is connected to the rear side member 12.

The dash cross member 7, the bulkhead lower cross member 8, and the seat riser member 9
Is connected to the side sill 4 on the opposite side connected to the floor tunnel 2.

The tunnel side members 5 extend in the longitudinal direction of the vehicle body, and are provided on both lower side surfaces of the floor tunnel 2 as shown in FIG. 4, and have a box-shaped cross section. The upper and lower reinforcements 6a and 6b are bolted between the two tunnel side members 5, thereby forming a closed cross-sectional structure in the floor tunnel 2 and improving strength and rigidity.
Further, as shown in the figure, the left and right
Reinforcement 6b tunnels lower panel 3
Are connected via the id member 5, which also
(A) Improving the strength and rigidity of the structure .

FIG. 5 shows the characteristics of the vehicle body floor structure according to the above embodiment. Regarding the bending stiffness characteristic diagram: This is shown as the load W1, W2 applied between the wheel bases. A large difference is seen in the maximum bending displacement (the amount of deflection a, b of the vehicle body). Further, when the front side member and the reinforcement are provided, the vehicle body floor front end D
And a strong joint at the rear end E (weak point)
Does not occur. If not provided, such a clause occurs. Regarding the torsional rigidity characteristic diagram: This shows the torsional angular displacement when the torsional torque T1 is applied to the front wheels with the rear wheels as the support ends. Also in this figure, when the front side member and the reinforcement are provided,
The displacement (α) is small, and strong joints (weak points) do not occur at the front end D and the rear end E of the vehicle body floor. When not provided, the displacement (β) is large, and nodes are generated.

As is apparent from FIG. 5, in this embodiment, the displacement is small in both bending and torsion, and ideal characteristics without nodes are obtained. Therefore, floor tunnel 2
FR car (front engine, rear drive) as shown in FIG. 4 in which a propeller shaft 13 and an exhaust pipe 14 are provided inside
In this case, the influence on these components can be reduced. Further, as apparent from FIG. 5, the floor
The space inside the tunnel 2 is divided into upper and lower
Separate propeller shaft 13 and exhaust pipe 14 in space
Position, preventing interference between these components.
Can be passed. The present invention can be applied not only to FR vehicles but also to FF vehicles (front engine, front drive), MR vehicles (midship car), and RR vehicles (rear engine, rear drive) to a vehicle body structure using a floor tunnel as a strength member.

Although the present invention has been described with reference to the above embodiment,
The present invention is not limited to the above embodiments, and all changes and additions within the technical idea of the present invention are included in the technical scope of the present invention.

Although the above-mentioned reinforcements 6a and 6b are fixed by bolts, part or all of them may be fixed by welding. Further, the reinforcements 6a and 6b may be only upper or lower depending on various conditions such as maintenance service, maintenance, or relation with exhaust heat.

The tunnel side member is not limited to the box shape in cross section, but may be a flat tunnel side member 15 as shown in FIG.

[0015]

As described above, according to the vehicle body floor structure of the present invention, there is no need to provide a floor side member or the like on the floor lower surface, and the floor surface can be lowered. As a result, the seat position and the center of gravity can be lowered. For this reason, it is particularly suitable for sports-type vehicles that require a lower center of gravity. Further, the members constituting the reinforcing structure can have a large cross-sectional area in the floor tunnel, so that it is not necessary to increase the plate thickness in order to maintain the strength, and the weight does not increase. Eventually, the entire vehicle body can be made of a thin steel plate, and excellent characteristics are exhibited when adopted in a type of vehicle such as an open car that requires structural reinforcement. Further, both bending and twisting have little displacement, ideal characteristics without knots can be obtained, and excellent maneuverability and stability can be obtained as running performance. Furthermore, in the present invention, in addition to these effects, the
The space inside the floor tunnel 2 is divided up and down and formed
Separate propeller shafts and exhaust pipes in upper and lower spaces
To prevent interference between these components
be able to.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an automobile provided with a vehicle body floor structure according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing an automobile provided with a vehicle body floor structure according to the embodiment of the present invention.

FIG. 3 is a plan view illustrating an embodiment of a vehicle body floor structure according to the present invention.

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

FIG. 5 is a graph showing strength characteristics of the vehicle body floor structure according to the embodiment of the present invention.

FIG. 6 is a partial sectional view of another embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a conventional vehicle body floor structure.

FIG. 8 is a cross-sectional view illustrating a conventional vehicle body floor structure.

[Explanation of symbols]

 2,72 floor tunnel 3 floor panel 4,73 side sill 5,15 tunnel side member 6a, 6b reinforcement 7 dash cross member 8 bulkhead lower cross member 9 seat riser member 10 front side member 11 front end member 12 rear side member 13 Propeller shaft 14 Exhaust pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-11280 (JP, U) JP-A 62-171376 (JP, U) JP-A 64-26581 (JP, U) JP-A 3- 44058 (JP, U) Japanese Utility Model 2-103882 (JP, U) Japanese Utility Model 2-56783 (JP, U) Japanese Utility Model 63-100377 (JP, U) Japanese Utility Model 63-168172 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (1)

(57) [Claims] A tunnel side member extending in the longitudinal direction of a vehicle body is provided on both side surfaces of a floor tunnel, and a reinforcement extending in the longitudinal direction of the vehicle body is fixed between the tunnel side members. And a propeller shaft in the upper and lower spaces formed,
An exhaust pipe located separately, extending the longitudinal direction of the car body Les
The reinforcement is flowed to the left and right of the floor tunnel.
A car body floor structure characterized by connecting Apanels .