Transfer cooling structure of vehicle

1. A transfer cooling structure of a vehicle including a power source, a transmission, and a transfer device provided with a torque-distribution-control friction clutch, disposed in order from a forward side of the vehicle to a rearward side of the vehicle, the transfer cooling structure comprising:

a floor provided in the vehicle and the floor having a tunnel part configured to cover a transmission case of the transmission and a transfer case of the transfer device from above the transmission case and the transfer case;

an insulator attached below the tunnel part of the floor to cover the transmission case and the transfer case, while having a gap between the insulator and the transmission case and the transfer case; and

wherein the insulator has a cooling acceleration part protruding toward the transfer case from a floor side of the insulator.

2. The structure of claim 1 , wherein the gap between the insulator, and the transmission case and the transfer case is the smallest at the cooling acceleration part.

3. The structure of claim 2 ,

wherein a given member is provided above the transmission case, and

wherein a rectifying cover is provided at a rear part of the given member.

4. The structure of claim 3 , wherein the power source includes a motor, and the given member includes an inverter.

5. The structure of claim 4 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

6. The structure of claim 1 ,

wherein a given member is provided above the transmission case, and

wherein a rectifying cover is provided at a rear part of the given member.

7. The structure of claim 6 , wherein the power source includes a motor, and the given member includes an inverter.

8. The structure of claim 1 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

9. The structure of claim 2 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

10. The structure of claim 3 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

11. The structure of claim 6 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

12. The structure of claim 7 ,

wherein a plurality of fins are provided to outside of the transfer case, and

wherein a fin of the plurality of fins provided to an upper part of the transfer case has a taller height compared to fins of the plurality of fins provided to other parts of the transfer case.

13. The structure of claim 1 , wherein the cooling acceleration part includes a substantially U-shaped curved surface extending in a front-and-rear direction of a vehicle body.

14. The structure of claim 13 , wherein the curved surface curves downwardly in an arc shape from a front end part to a central part of the curved surface in the front-and-rear direction so that the gap with respect to the transfer case is gradually reduced, and curves upwardly in an arc shape from the central part to a rear end part of the curved surface so that the gap with respect to the transfer case is gradually increased.

15. The structure of claim 13 , wherein the curved surface includes at the central part an arc part protruding upwardly in a vehicle-width direction so as to conform to the shape of the insulator protruding upwardly to cover above and left and right sides of the transfer case.

16. The structure of claim 5 ,

wherein the plurality of fins extend in a front-and-rear direction of the vehicle and are provided to an upper part, a lower part, a left part, and a right part of a cylindrical part of a transfer case body of the transfer device, and

wherein the fins provided to the upper part extend perpendicular to a vehicle-width direction, and are formed to have a taller height compared to the fins provided to the lower part, the fins provided to the left part, and the fins provided to the right part.

17. The structure of claim 8 ,

wherein the plurality of fins extend in a front-and-rear direction of the vehicle and are provided to an upper part, a lower part, a left part, and a right part of a cylindrical part of a transfer case body of the transfer device, and

wherein the fins provided to the upper part extend perpendicular to a vehicle-width direction, and are formed to have a taller height compared to the fins provided to the lower part, the fins provided to the left part, and the fins provided to the right part.