Title:
DYNAMIC PRESSURE BEARING, SPINDLE MOTOR EQUIPPED WITH THIS DYNAMIC PRESSURE BEARING AND DISC DRIVING DEVICE USING THIS SPINDLE MOTOR
Document Type and Number:
Japanese Patent JP2004132484
Kind Code:
A
Abstract:
To cut off the movement of bubbles dragged into oil by a dynamic pressure generating groove in operation; and to make the bubbles dischargeable.
This dynamic pressure bearing has a radial bearing part where at least one end part is adjacent to a gas-liquid interface of oil and air. This radial bearing part is provided with the dynamic pressure generating groove in the shape of inducing an axial directional flow turning to the other end part side from the gas-liquid interface side to the oil. A peripheral directional hill part for cutting off the movement of the bubbles intruding from the gas-liquid interface side is arranged by dividing this dynamic pressure generating groove.
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Inventors:
OE TAKAYUKI
HIRONO TEIICHI
ICHIBAYA EMI
HIRONO TEIICHI
ICHIBAYA EMI
Application Number:
JP2002298115A
Publication Date:
April 30, 2004
Filing Date:
October 11, 2002
Export Citation:
Assignee:
NIHON DENSAN KK
International Classes:
F16C17/10; F16C33/10; G11B19/20; H02K7/08; H02K21/22; (IPC1-7): F16C17/10; F16C33/10; G11B19/20; H02K7/08; H02K21/22
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