Patent ID: 6488607
Filing Date: 2002-12-03
Classification: F16H

Abstract:
A toroidal continuously variable transmission, comprising:first and second discs disposed coaxially with each other and rotatably supported in a condition that inner surfaces thereof are opposed to each other; a plurality of trunnions rocked around pivot shafts located at positions twisted with respect to central axes of said first and second discs; displacement shafts protruded from and supported by inner surfaces of said trunnions at intermediate portions thereof; power rollers disposed toward the inner surfaces of said trunnions and rotatably supported around said displacement shafts while being pinched between said first and second discs; hydraulic actuators provided for the respective trunnions and adapted to rock said trunnions around said pivot shafts by displacing said trunnions in axial directions of said pivot shafts thereby to change a speed change ratio between said first disc and said second disc; a control valve for switching supplying/discharging of pressurized oil with respect to said trunnions; and a feedback mechanism provided for a first of said trunnions and adapted to transmit movement of said first trunnion having said feedback mechanism to said control valve to switch a supplying/discharging condition of said control valve; and wherein the inner surfaces of said first and second discs are concave surfaces having arcuate sections, and peripheral surfaces of said power rollers are spherical convex surfaces, and said peripheral surfaces abut against the inner surfaces of said discs; and further wherein a relationship between the switching of said control valve and the displacements of said trunnions is such that initiation of the displacement of said first trunnion having said feedback mechanism is effected prior to initiation of the displacement of a second trunnion not having said feedback mechanism.