Abstract: A continually variable transmission includes an input shaft, an output shaft and a first drive mechanism having a first input on a first axis and a first output on a second axis. The first drive mechanism produces a fixed ratio of the speed of the first input to the speed of the first output. The first input drives the first output without a member on an intervening axis. A second drive mechanism is arranged in parallel with the first drive mechanism, having a second input and second output, for producing a stepless, continually variable range of ratios of the speed of the second input to the speed of the second output. A mode clutch alternately driveably connects and releases either the members of a first group consisting of the first input and second input or the members of a second group consisting of the first output and second output.

Abstract: A pulley shaft and stationary pulley assembly for a belt drive mechanism of a continuously variable transmission includes an inner surface of the pulley having metal-cutting serrations, a blocking shoulder, and a surface for engaging a pilot guide surface formed on the shaft. The shaft, formed of softer material than the hardened pulley, includes a shoulder adapted to have serrations formed in it during the assembly process, a hardened pilot guide, and a blocking shoulder adapted to contact the blocking shoulder of the pulley.