Power roller unit and output disc unit for toroidal type continuously variable transmission

A pre-assembled disc unit for use in assembling a toroidal type continuously variable transmission, said disc unit comprising:

• a transmission disc having a substantially arcuately concave front-side surface and provided at a central portion with a through hole passing axially through said disc;
• a radial rolling bearing disposed within said through hole;
• and
• a stop ring locked within a lock groove formed in an inner peripheral surface of said through hole and disposed so as to prevent said radical rolling bearing from escaping from said through hole;
• said disc, said radial rolling bearing and said stop ring being pre-assembled substantially to a positional relation to be attained after incorporation into a toroidal type continuously variable transmission, thereby enabling evaluation of the pre-assembly prior to incorporation into the transmission.