Roller assembly for piston actuator

摘要

A toroidal assembly for use in a toroidal-race rolling-traction variator includes a stem (21) having an end face exposed to the pressurising effect of the cooling fluid and a double acting piston (25) has a confronting surface also exposed to the pressurising effect, such that any axial load on the stem (21) is at least partially counteracted by an opposite effect on the confronting surface of said double acting piston (25).