Belt-Type Continuously Variable Transmission and Straddle-Type Vehicle

摘要

Abrasion of a V-belt in a belt type continuously variable transmission accommodated in an engine unit of a motorcycle is suppressed. A V-belt wound around and contacting a primary sheave and a secondary sheave 72 is at least partially formed from a resin. A plurality of grooves aligned at a predetermined pitch in a radial direction are formed on sheave surfaces of the primary and secondary sheaves. The average pitch P(mm) of the grooves is P<=-0.08Kx10^-3+0.18, where K(Hv) indicates surface hardness of the sheave surfaces.