Title:
スピンドルモータ
Document Type and Number:
Japanese Patent JP4460730
Kind Code:
B2
Abstract:
A spindle motor comprises a double row bearing device (4) including a shaft (5), a sleeve (9) surrounding the shaft (5), and a pair of upper and lower rows of balls (12a,12b). A cylindrical bearing holder (2) extends upwardly from a base (1) of the spindle motor for accommodating the sleeve (9) within a vertical bore (3) of the holder (2), and a rotor hub (6) is mounted on the shaft (5) for journaling the rotor hub (6) rotably on the base (1). A reduced inner diameter portion (3a) of an inner diameter smaller than the outer diameter of the sleeve (9) is formed on the inner surface of the bore (3) of the bearing holder (2) between the upper and lower larger inner diameter portions to urge the sleeve (9) inwardly by the reduced inner diameter portion (3a) to deform it elastically to form a squeezed portion (9a) protruding inwardly of the sleeve (9) between the upper and lower rows of balls (12a,12b).
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Inventors:
Rikuro Ohara
Hiroshi Yoshikawa
Hiroshi Yoshikawa
Application Number:
JP2000209895A
Publication Date:
May 12, 2010
Filing Date:
July 11, 2000
Export Citation:
Assignee:
Minebea Co., Ltd.
International Classes:
F16C25/08; H02K5/16; F16C19/08; F16C19/54; F16C35/06; F16C35/073; G11B19/20; H02K5/173; H02K21/22
Domestic Patent References:
| JP9182362A | ||||
| JP6047732U | ||||
| JP6251496A | ||||
| JP6030541A | ||||
| JP4112643A | ||||
| JP6307439A |
Attorney, Agent or Firm:
Tsunehisa Kato