Patent ID: 9132483
Filing Date: 2015-09-15
Classification: B23B,B23P,B23Q,B25B,F16H,Y10T

Abstract:
1. A method for manufacturing a variator disc for use in a toroidal continuously variable transmission, the method comprising steps of: obtaining a steel disc blank of steel with a machining allowance, the disc blank having a first face with a concave race, a second face opposite the first face, a through central bore extending between the first and the second faces, and an outer peripheral edge; heat treating the disc blank; turning the concave race on a lathe; wherein the phase of turning the concave race is preceded by a phase of turning the bore, thereby obtaining at least a turned cylindrical portion of the bore, and the phase of turning the concave race is carried out while the disc blank is locked on the lathe by jaws which engage the turned cylindrical portion, using the turned cylindrical portion as a reference surface for turning the concave race.