Toroidal type continuously variable transmission

A toroidal type continuously variable transmission apparatus comprising:

• a toroidal type continuously variable transmission comprising:
• an input shaft to which a rotation torque is input;
• an input side disk and an output side disk that are concentrically and rotatably supported by the input shaft in a state that an inner peripheral surface of the input side disk opposes to an inner peripheral surface of the output side disk;
• a power roller held between the input side disk and the output side disk;
• and
• a hydraulic loading device applying predetermined pressing force so that the power roller is pressed between the input side disk and the output side disk;
• and
• a planetary gear transmission unit adopted to switch a pluralities of speed mode,
• wherein fine grooves are formed on around speed mode changing areas of respective the inner peripheral surfaces of the input side disk and the output side disk, and
• wherein the speed mode switching areas contact with the power roller when the planetary gear transmission unit switches the speed mode.