Title: Ball bearing device, oscillating weight structure for automatic winding and automatic winding timepiece equipped with the same
Application Number: 200610094507 Application Date: 2006.06.08
Publication Number: 1877466 Publication Date: 2006.12.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G04B31/00,G04B5/00,G04B5/02,G04B5/18,F16C19/02
Applicant(s) Name: Seiko Instr Inc. Address:
Inventor(s) Name:
Attorney & Agent: wen dapeng huang lihang
Abstract:
     A ball bearing device includes an outer ring, an inner ring, a plurality of balls disposed between the outer ring and the inner ring regulated in the radial direction, a retainer provided with a plurality of recessed sections in the circumferential direction at intervals each having an opening in the outer periphery for holding respective one of the balls in the circumferential direction at intervals, and rotatably fitted to the inner ring. Each of the recessed sections of the retainer is formed deeper and wider than the ball in a bottom wall section of the recessed section so that a gap remains between a bottom wall surface of the recessed section and a surface of the ball radially regulated between the outer ring and the inner ring, and can be abut on the ball with the surface opposing to the ball in the circumferential direction in surface sections adjacent to the opening.
Time: 10
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