Patent ID: 6109383
Filing Date: 2000-08-29
Classification: B60K,B60Y,B62M,F02B,Y02T,Y10S

Abstract:
A power unit for a motorcycle, comprising:an engine positionable in front of a rear wheel of the motorcycle such that a crank shaft extends in a longitudinal direction and a cylinder block of the engine is laterally adjacent to a front portion of the rear wheel, the cylinder block having at least one cylinder positionable in a width direction of the motorcycle, said at least one cylinder having a cylinder axis oriented in a substantially horizontal direction;a power transmission system positionable on one side of the rear wheel for transmitting power of the engine;the power unit being mountable to a main frame of the motorcycle through a swing axis formed at a front portion of the power unit, the power unit swingable together with the rear wheel;a valve drive mechanism disposed on a front surface of the cylinder block; anda primary drive gear for transmitting power of the engine to said power transmission system is disposed behind the cylinder axis.