Toroidal type continuous variable speed transmission

A toroidal type continuous variable speed transmission, comprising:

• an input side disk and an output side disk sharing the same center, each having a circular concave, the inner faces of said disks opposing each other, and each being rotatably supported;
• a plurality of trunnions rocking around axes, each axis being skew with respect to the central axis of the input side disk and output side disk;
• displacement shafts supported at middle parts of the respective trunnions so as to project from the inner faces of the trunnions;
• power rollers each of which has a spherically convex circumferential face and is supported rotatably around the displacement shaft, the power rollers being positioned at the inner face side of the respective trunnions and put between the input side disk and the output side disk;
• hydraulic actuators each of which is provided on each trunnion the hydraulic actuator varying the gear ratio between the input side disk and the output side disk by a rocking displacement of the trunnion about the axis caused by an axial displacement of the axis of the trunnion;
• and
• a control valve for switching the feeding/discharging state of pressurized oil to and from each of the hydraulic actuators,
• wherein a precess cam is fixed to a member to be displaced together with one of the trunnions;
• wherein the motion of the trunnion is transmitted to the control valve by a feedback mechanism for transmitting the displacement of the precess cam to the control valve via a link arm to make possible switching of the feeding/discharging state by this control valve;
• and
• wherein the position of contact between the precess cam and the link arm is closer to the input side disk than the central axis of the trunnion provided with the precess cam is.