Vehicle body structure

1. A vehicle body structure comprising:

a center frame extending in a front-rear direction of a vehicle at a center in a vehicle width direction; and

at least one support member extending toward at least one of outer sides in the vehicle width direction from the center frame, each support member having a free end which is not connected to any other parts of the center frame or other support members, wherein

the support member supports at least one of a steering system, a pedal system, at least one seat, and at least one footrest member of the vehicle.

2. The vehicle body structure according to claim 1 , wherein

said at least one support member comprises a first support member extending to one side of the outer sides in the vehicle width direction from said center frame, and a second support member extending to an other side of the outer sides, wherein

each of said first support member and second support member supports one of said at least one seat.

3. The vehicle body structure according to claim 2 , wherein

said first support member supports a driver's seat, and

said second support member supports a passenger's seat in a detachable manner.

4. The vehicle body structure according to claim 3 , further comprising a cowl member arranged at least on said other side of said center frame, when said passenger's seat is detached.

5. The vehicle body structure according to claim 2 , wherein

said at least one support member further comprising another support member extending to said one side in the vehicle width direction from said center frame, wherein

said another support member supports the steering system.

6. The vehicle body structure according to claim 1 , wherein

said center frame has a die-casted aluminum frame.

7. The vehicle body structure according to claim 1 , wherein

said center frame at a rear side thereof has a shroud frame branching into parts which extend toward the respective outer sides in the vehicle width direction, then extend to a rear of the vehicle and join each other at the rear, thereby forming a space surrounded by the shroud frame, inside which a power unit of the vehicle is accommodated.

8. The vehicle body structure according to claim 7 , wherein

said center frame at the rear side thereof has two of said shroud frames spaced apart from each other in a vehicle height direction.

9. The vehicle body structure according to claim 7 , wherein

said center frame has a pair of upper-and-lower frames arranged in the vehicle width direction, each of the upper-and-lower frames being connected to a rear side of said shroud frame and branching into upper and lower parts in the vehicle height direction, thereby forming a space through which a drive shaft of the vehicle is inserted.

10. The vehicle body structure according to claim 1 , wherein

said center frame has at least one hollow part formed therein inside which a fuel tank is arranged.

11. The vehicle body structure according to claim 1 , further comprising a protection member for protecting an occupant of the vehicle in an event of a vehicle rollover, wherein

said protection member is arranged on an upper surface of said center frame and is configured to enlarge or extend to reach a position at least higher than a height of said at least one seat in a vehicle height direction in the event of the vehicle rollover.

12. The vehicle body structure according to claim 11 , wherein

said protection member is provided to the vehicle at both sides of said at least one seat in the front-rear direction and arranged in at least three different locations in the vehicle.