Vehicle floor structure

1. A floor structure for a vehicle, comprising:

a center floor;

a plurality of longitudinal members attachably disposed on a top surface of the center floor;

a plurality of seat rails disposed in the plurality of longitudinal members, respectively; and

a battery assembly arranged under the center floor.

2. The floor structure according to claim 1 , wherein each longitudinal member extends in a longitudinal direction of the vehicle to connect a vehicle front structure and a vehicle rear structure.

3. The floor structure according to claim 1 , wherein each longitudinal member has a front end extending toward to be in contact with a dash panel and a rear end extending toward to be in contact with a rear floor,

wherein the dash panel is disposed on a front end of the center floor, and

wherein the rear floor is disposed on a rear end of the center floor.

4. The floor structure according to claim 1 , further comprising a plurality of seat crossmembers attachably disposed on the top surface of the center floor,

wherein each longitudinal member extends through each seat crossmember so that the plurality of longitudinal members and the plurality of seat crossmembers are connected to intersect with each other.

5. The floor structure according to claim 4 , wherein a top surface of the seat crossmember is at a same level as a top surface of the longitudinal member in a vertical direction of the vehicle.

6. The floor structure according to claim 4 , wherein the battery assembly includes:

a battery case;

a plurality of battery crossmembers fixed to an interior space of the battery case; and

a battery longitudinal member intersecting with the plurality of battery crossmembers,

wherein a top surface of each battery crossmember is aligned with a top surface of the battery case, and

wherein each of the plurality of battery crossmembers is fastened to the seat rail through a rail fastener.

7. The floor structure according to claim 6 , further comprising:

a reinforcing member received in a cavity of the seat crossmember; and

a support bracket attached to the top surface of the center floor,

wherein the reinforcing member is arranged above the support bracket.

8. The floor structure according to claim 7 , wherein the battery case is configured to be mounted to the center floor by a through bolt and a nut,

when the through bolt extends through the battery case,

when the nut is interposed between the support bracket and the reinforcing member, and

when the through bolt is configured to be screwed into the nut.

9. The floor structure according to claim 8 , wherein a top end of the through bolt extends through a cavity of the reinforcing member so that the through bolt is supported to the reinforcing member.

10. The floor structure according to claim 7 , wherein the reinforcing member and the seat rail are alternately arranged in a width direction of the vehicle.

11. The floor structure according to claim 1 , wherein each longitudinal member includes:

a top wall;

a pair of sidewalls extending from both side edges of the top wall toward the center floor, respectively; and

a pair of flanges extending from the pair of sidewalls, respectively,

wherein the top wall has an opening, and

wherein the pair of flanges are configured to extend toward to be in contact with the top surface of the center floor.

12. The floor structure according to claim 7 , wherein the reinforcing member includes:

a bottom wall;

a pair of sidewalls extending from both side edges of the bottom wall toward the seat crossmember, respectively; and

a pair of flanges extending from the pair of sidewalls, respectively, and

wherein the pair of flanges are configured to extend to toward to be in contact with the seat crossmember.