Patent Number: 6,332,717

Title: Rolling bearing for supporting rotary shaft of disk memory device

Abstract: A rolling bearing for a rotary shaft of a disk memory device which can maintain high-accuracy optical or magnetic recording ability over a long period of time. The rolling bearing supports a rotary shaft of a disk of disk memory device or a rotary shaft of an arm of a head, and has an inner ring having an inner diameter of 8 mm or less, and a retainer formed by molding an oil-containing resin composition comprising 40-94 wt % of a synthetic resin, 1-40 wt % of oil conducting material, and 5-30 wt % lubricating oil. Lubricating oil is dispersed uniformly in the composition, and can bleed onto the surface through the fibrous oil conducting material.

Inventors: Oohira; Kouya (Mie, JP), Egami; Masaki (Mie, JP), Akamatsu; Yoshinobu (Mie, JP)

Assignee: NTN Corporation

International Classification: F16C 33/66 (20060101); F16C 33/38 (20060101); F16C 33/41 (20060101); F16C 33/44 (20060101); G11B 19/20 (20060101); G11B 25/04 (20060101); F16L 033/44 ()

Expiration Date: 12/25/2018