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Title:
BEARING DEVICE, METHOD FOR MANUFACTURING BEARING DEVICE, AND INFORMATION RECORDING REGENERATIVE APPARATUS
Document Type and Number:
Japanese Patent JP2015014327
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a bearing device which can be manufactured inexpensively by easy work and can suppress torque ripple and torque increase in rotation, a method for manufacturing the bearing device, and an information recording regenerative apparatus including the bearing device.SOLUTION: A bearing device includes inner ring rolling surfaces 39, 49 in which the outer radiuses of inner ends 36b, 46b are formed to be smaller than a first separation distance K1 and to be gradually larger, and outer ring rolling surfaces 34,44 in which the inner radiuses of outer ends 31a, 41a are formed to be larger than a second separation distance K2 and to be gradually smaller. In the inside of the outer ring rolling surfaces 34, 44 in the axial direction, thick parts 25a, 25b swelling toward the inside in the radial direction are formed. Tip portions 27a, 27b of the thick parts 25a, 25b are provided to overlapped with a first retainer 60 and a second retainer 70 in the view from the axial direction.

Inventors:
IINO AKIHIRO
KOSAKA TAKAYUKI
Application Number:
JP2013141590A
Publication Date:
January 22, 2015
Filing Date:
July 05, 2013
Export Citation:
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Assignee:
SEIKO INSTR INC
International Classes:
F16C19/16; F16C19/18; F16C25/08; F16C33/41; F16C33/58; F16C35/073; F16C35/077; F16C43/04; G11B21/02; H02K5/173
Domestic Patent References:
JP2003065330A2003-03-05
JP2012189181A2012-10-04
JP2005233299A2005-09-02
JP2006118611A2006-05-11
JP2009156456A2009-07-16
JP2008089122A2008-04-17
Foreign References:
WO2009139276A12009-11-19
Attorney, Agent or Firm:
Masatake Shiga
Shingo Suzuki
Nishizawa Kazu -- pure