| 摘要 |
PROBLEM TO BE SOLVED: To provide a multipoint contact ball bearing to facilitate reduction of friction torque, prevention of wear, and improvement of durability by high- efficient improvement of surface coarseness of the raceway surface of a race when the race having a track surface making contact with a steel ball at two points consists of a single ring member. SOLUTION: The outer ring 12 of a two-piece inner ring type four-point contact ball bearing 10 consists of a single ring member of which a raceway surface 12a having the sectional shape of a Gothic arch is formed. Barreling is by a centrifugal barreling machine is applied on an outer ring 12 to improve surface coarseness of the raceway surface 12a. When barreling is executed by the centrifugal barreling machine for 12 hours in seccession, surface coarseness of the outer ring 12 having surface coarseness of 0.3μmRa before barreling is improved to 0.06μmRa.
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