Patent ID: 8567276

Claim:
An engine unit comprising: a crankshaft arranged in an approximately lateral direction of a vehicle in which the engine unit is mounted; a drive shaft arranged parallel or substantially parallel to the crankshaft and arranged to output a drive to a driving wheel via a sprocket provided at one end of the drive shaft in the lateral direction; a main shaft aligned parallel or substantially parallel to the drive shaft, and arranged to rotate by a rotation power transferred from the crankshaft and to provide an output to the drive shaft via a transmission gear mechanism; a clutch arranged to connect and disconnect the rotation power transferred from the crankshaft to the main shaft; and a drive unit case in which the crankshaft, the main shaft, the transmission gear mechanism, and the drive shaft are provided in a rotatable fashion; wherein the main shaft is provided in the drive unit case such that one end of the main shaft projects from the drive unit case toward the one end of the drive shaft and beyond the one end of the drive shaft; the one end of the main shaft and the one end of the drive shaft are located at a same side of the drive unit case; and the clutch is detachably connected to the one end of the main shaft at a position radially overlapping with at least a portion of the sprocket.