| 摘要 |
A power unit 20 for a vehicle has a crankcase 23R, 23L and encasing a crankshaft 37, a V-belt drive continuously variable transmission 35 including a drive pulley shaft 38 coaxial or parallel with the crankshaft 37, a driven pulley shaft 39 parallel with the crankshaft, a transmission case 67 disposed on one side of the crankcase 23R, 23L and encasing the continuously variable transmission 35, a final output shaft 43 disposed on the other side of the crankcase to transmit the output of the engine through a transmission mechanism 22 to the drive wheel 14 of the vehicle, and a wet centrifugal clutch 95 disposed on one side of the crankcase 23R, 23L for operatively connecting and disconnecting the driven pulley shaft 39 and the final output shaft 43. The power unit 20 is mounted on the vehicle with the crankshaft 37 extended transversely of the vehicle. A centrifugal clutch chamber 89 holding the wet centrifugal clutch 95 is formed outside the crankcase 23R, 23L, and a transversely outer end of the centrifugal clutch chamber 89 is covered with the transmission case 67. Oil levels suitable for lubricating the crankshaft 37 and the wet centrifugal clutch 95 can be individually set. The crankcase 23 can be formed in a rigid structure. |
