Toroidal continuously variable transmission

A toroidal continuously variable transmission comprising:

• a first transmission unit including:
• a first input disc and a first output disc disposed coaxially with each other;
• and
• a first power roller tiltably interposed between the first input disc and the first output disc and configured to transmit a driving force from the first input disc to the first output disc;
• and
• a second transmission unit disposed coaxially with the first transmission unit, the second transmission unit including:
• a second input disc and a second output disc disposed coaxially with each other;
• and
• a second power roller tiltably interposed between the second input disc and the second output disc and configured to transmit a driving force from the second input disc to the second output disc, the second transmission unit being disposed such that a back surface of the second input disc is opposed to a back surface of the first input disc,
• wherein the back surface of the first input disc is provided with a back surface cylinder wall of a tubular shape protruding therefrom so as to be concentric with the first input disc, and the back surface of the second input disc is provided with a back surface cylinder wall of a tubular shape protruding therefrom so as to be concentric with the second input disc.