Patent ID: 7971674

Claim:
A shaft drive type motorcycle, comprising: a body frame, a swing arm provided on said body frame and operative to swingably support a rear wheel, a drive shaft provided in said swing arm or adjacently to said swing arm and operative to transmit a driving force of an engine to said rear wheel, a constant-velocity universal joint interposed in said drive shaft, and a pinion gear provided at one end of said drive shaft and meshed with a final gear provided at said rear wheel, wherein a shaft part is extended from a cup of said constant-velocity universal joint, said shaft part is provided with a male spline, a tubular part is extended from said pinion gear, said tubular part being provided with a female spline in which to fit said male spline, said male spline and a female spline constitute a spline coupling part, and wherein said pinion gear is comprised of a tooth part, and a tubular part extending forward from said tooth part, said tubular part having a through-hole, a front half of said through-hole having with said female spline, and a pinion shaft is inserted in a rear half of said through-hole.