| 摘要 |
PROBLEM TO BE SOLVED: To reduce abnormal sound and vibration by setting a part opposed to each roller rolling surface to a recess of a circular arc cross section of the curvature radius close to the curvature radius of the rolling surface in the circumferential both side edges of each column part of a holder. SOLUTION: A partially cylindrical recess surface 13 is formed in an intermediate part or an inside diameter side part relative to the diametrical direction of a holder 7a which is a part of circumferential both side edges of a column part 10a connecting rims of the holder 7a to each other and a part opposite to the rolling surface of the roller 6 held in a pocket 11, The recess surface 13 is formed by the surface pressurizing by a press and formed into the recess of circular arc cross section of the curvature radius R13 a little larger than the curvature radius of the rolling surface of the roller 6. This constitution can efficiently trap the lubricant oil stuck to the rolling surface of the roller 6 during a bearing driving in fine clearances, and a rigid oil film is formed by wedging. This constitution can prevent the generation of abrasion, abnormal sound, vibration, seizure, etc., by the metal contact and suppress the temperature rising during driving of rotation support part.
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