Toroidal continuously variable transmission

A toroidal continuously variable transmission, comprising:

• an input disk;
• an output disk, the input and output disks having a common first rotation axis about which the input and output disks are rotatable;
• and
• a power roller swingably interposed between the input and output disks and having a second rotation axis intersecting the first rotation axis, about which the power roller is rotatable,
• the input and output disks and the power roller having traction surfaces cooperating with each other to transmit rotation between the input and output disks and the power roller,
• at least one of the input and output disks and the power roller having a surface roughness on the traction surface thereof which varies in a direction of the rotation axis thereof.