POWER TRANSMISSION DEVICE OF MOTORCYCLES

摘要

A power transmission device of a motorcycle comprising a main transmission case formed integrally with an engine crank case and accommodating a main transmission, and a subtransmission case provided at the rear side of the main transmission case. The sub-transmission case accommodates a subtransmission which is drivingly connected to the main transmission and also to a rear wheel of the motorcycle through a transmission mechanism. The transmission mechanism and the subtransmission are disposed at opposite sides of the rear wheel. The sub-transmission case is composed of a case body and a cover for covering an opening of the case body. The opening is formed at a lateral side of the gears of the sub-transmission so that the gears are accessible and replaceable by removing the cover from the opening.