THRUST BALL BEARING FOR POWER ROLLER OF TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To improve the durability of a thrust ball bearing 15a by securing the service life of a power roller 8a and an outer ring 17a. SOLUTION: A fracture toughens value K1c of a material forming a power roller 8A is set larger than a fracture toughness value K1c' of a material forming the outer ring 17a (K1c>K1c'). The maximum contact surface pressure Pmax between an inner ring track 18a and each ball 16 and 16 is set smaller than the maximum contact surface pressure Pmax' of an outer ring track 19a and each ball 16 and 16 (Pmax<Pmax').