Vehicle

1. A vehicle comprising:

an internal combustion engine including a crankshaft;

a frame supporting the internal combustion engine;

a transmission including an input shaft linked to the crankshaft to transmit power therebetween, and an output shaft linked to the input shaft and that rotates at a rotational speed lower than a rotational speed of the input shaft;

a driving device linked to the output shaft to transmit power therebetween and to generate a driving power; and

a supercharger including a rotation shaft linked to the output shaft to transmit power therebetween and to compress air and supply the compressed air to the internal combustion engine; wherein

the transmission is a continuously variable transmission or a stepped transmission;

a transmission ratio of the transmission is changeable during operation of the transmission; and

the supercharger is fixed to the frame without the engine interposed therebetween; and

wherein the output shaft includes a driving device link portion linked to the driving device, and a supercharger link portion linked to the rotation shaft of the supercharger; and

wherein the driving device link portion is located between the supercharger link portion along the output shaft and the transmission.

2. The vehicle according to claim 1 , wherein the internal combustion engine is fixed to the frame via an elastic member therebetween.

3. The vehicle according to claim 2 , wherein the internal combustion engine is movable relative to the frame, and the supercharger is fixed to the frame so as to be immovable relative to the frame.

4. The vehicle according to claim 1 , wherein the internal combustion engine includes an intercooler including a suction port to take in air;

the supercharger includes a discharge port to discharge air;

the vehicle includes an air passage connecting the discharge port of the supercharger and the suction port of the intercooler with each other; and

at least a portion of the air passage is made of a flexible member.

5. The vehicle according to claim 1 , wherein the supercharger is located above the internal combustion engine as the vehicle is seen from a side.

6. The vehicle according to claim 1 , wherein the rotation shaft of the supercharger is linked to the output shaft to transmit power therebetween; and

the continuously variable transmission includes a driving pulley attached to the input shaft, a driven pulley attached to the output shaft, and a belt wound around the driving pulley and the driven pulley.

7. The vehicle according to claim 1 , wherein the rotation shaft of the supercharger is linked to the supercharger link portion of the output shaft via at least one of a belt, a chain, and a gear.

8. The vehicle according to claim 1 , further comprising a clutch located between the crankshaft and the input shaft or between the output shaft and the rotation shaft.

9. The vehicle according to claim 8 , wherein the clutch is a centrifugal clutch.

10. The vehicle according to claim 1 , wherein the transmission is located to a side of the internal combustion engine, and the supercharger is located on an opposite side of the internal combustion engine from the transmission.

11. The vehicle according to claim 1 , wherein the crankshaft extends in a vehicle width direction;

the transmission is located on a first side of the internal combustion engine in the vehicle width direction; and

the supercharger is located on a second side, opposite to the first side, of the internal combustion engine in the vehicle width direction.

12. The vehicle according to claim 1 , wherein the vehicle is a snowmobile.

13. The vehicle according to claim 1 , wherein the vehicle is an off-road vehicle.

14. The vehicle according to claim 1 , wherein the supercharger is fixed directly to the frame.

15. A snowmobile comprising:

an internal combustion engine including a crankshaft; a frame supporting the internal combustion engine;

a transmission including an input shaft linked to the crankshaft to transmit power therebetween, and an output shaft linked to the input shaft and that rotates at a rotational speed lower than a rotational speed of the input shaft;

a driving device linked to the output shaft to transmit power therebetween and to generate a driving power; and

a supercharger including a rotation shaft linked to the input shaft or to the output shaft to transmit power therebetween and to compress air and supply the compressed air to the internal combustion engine; wherein

a transmission ratio of the transmission is changeable during operation of the transmission;

the supercharger is fixed to the frame without the engine interposed therebetween;

the supercharger is located above the internal combustion engine; and

wherein the output shaft includes a driving device link portion linked to the driving device, and a supercharger link portion linked to the rotation shaft of the supercharger; and

wherein the driving device link portion is located between the supercharger link portion along the output shaft and the transmission.

16. The snowmobile according to claim 15 , wherein

the internal combustion engine includes a crankcase, and

the supercharger is located above the crankcase as seen from a side of the snowmobile.

17. The snowmobile according to claim 15 , further comprising:

a brake disc linked to the output shaft; wherein

the supercharger is located above the brake disc as seen from a side of the snowmobile.

18. The snowmobile according to claim 15 , wherein the frame includes:

a steering shaft extending diagonally toward a lower front side of the snowmobile as seen from a side of the snowmobile;

a steering frame rotatably supporting the steering shaft and extending diagonally toward a lower rear side of the snowmobile as seen from the side of the snowmobile;

a side frame supporting the internal combustion engine; and

at least a portion of the supercharger is located in an area surrounded by the steering shaft, the steering frame, and the side frame as seen from the side of the snowmobile.

19. The snowmobile according to claim 15 , wherein the frame includes:

a steering shaft extending diagonally toward a lower front side of the snowmobile as seen from a side of the snowmobile;

a steering frame rotatably supporting the steering shaft and extending diagonally toward a lower rear side of the snowmobile as seen from the side of the snowmobile;

a side frame supporting the internal combustion engine; and

the rotation shaft of the supercharger is located in an area surrounded by the steering shaft, the steering frame, and the side frame as seen from the side of the snowmobile.