| 摘要 |
A motorcycle has a motor mounted on a frame, a drive shaft extending from the motor transversely to the direction of travel, a rear wheel axle and a shaft drive mechanism extending longitudinally from the drive shaft to the rear wheel axle for transmitting power from the drive shaft to the rear wheel axle. The drive mechanism has an elongate housing with a first end portion pivotably mounted about the drive shaft and a second end portion pivotably mounted about the rear wheel axle. A drive gear is located on the drive shaft for rotation thereby, and an axle gear is located on the rear axle for driving the rear axle. A pinion shaft is supported by the housing so as to be rotatable about its own longitudinal axis. The pinion shaft has a front pinion gear meshing with the drive gear and a rear pinion gear meshing with the axle gear so that, when the drive shaft is driven by the motor, the force applied by the drive gear to the front pinion gear creates a first moment on the pinion shaft about the drive shaft which is opposite in direction to a second moment on the pinion shaft about the rear axle which is created by the force of the rear pinion gear driving the axle gear.
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