Toroidal-type continuously variable transmission

A toroidal-type continuously variable transmission, comprising:

• a rotary shaft;
• first and second disks rotatably supported on the periphery of said rotary shaft respectively, each of the inner surfaces of said first and second disks defining a concave surface having an arc-shape in section, said inner surfaces of said first and second disks being disposed opposed to each other;
• a trunnion swinging about a pivot shaft situated at a torsional position with respect to the center axes of said first and second disks;
• a displacement shaft provided in said trunnion;
• a power roller held between said first and second disks in such a manner as to be rotatably supported on the periphery of said displacement shaft, said power roller including a peripheral surface formed in a spherical convex surface;
• and
• a thrust rolling bearing interposed between said power roller and said trunnion for supporting a thrust-direction load applied to said power roller,
• wherein said thrust rolling bearing comprises a plurality of rolling elements and a retainer rollably holding said plurality of rolling elements,
• said retainer defines a circular-ring-shaped main body, a plurality of pockets respectively formed in said main body for rollably holding said plurality of rolling elements, and a plurality of lubricating oil passages respectively formed between the inner and outer peripheral edges of said main body in such a manner as to cross said pockets respectively, each of said lubricating oil passages having a section formed in a single arc shape.