Power transmission casing apparatus in motorized two-wheeled vehicle

Claim 1

A power transmission casing apparatus in a motorized two-wheeled vehicle comprising a case main body extending from one lateral side of an internal combustion engine to one lateral side of a rear wheel positioned rearwardly of said engine, said case main body rotatably supporting a wheel axle of said rear wheel and partially housing in a rear portion a reduction gear means which comprises the wheel axle, an input shaft, and a gear train operatively interconnecting the input shaft to the wheel axle, said casing apparatus also housing V-belt means comprising a rear pulley on the input shaft, a forward pulley on an output shaft of the engine and a V-belt operatively connecting the pulleys, each of the pulleys having a circumferential periphery; a transmission cover member sealingly engaging with said case main body in a fluid tight manner and extending to enclose said reduction gear means, said input shaft extending through said transmission cover member; and a V-belt cover sealingly engaging with the case main body and extending from beyond the forwardmost portion of the periphery of the forward pulley to beyond the rearmost portion of the periphery of the rear pulley to enclose the V-belt means.