HYDRODYNAMIC FLUID BEARING DEVICE, SPINDLE MOTOR AND RECORDING DISK DRIVE MECHANISM EQUIPPED THEREWITH

PROBLEM TO BE SOLVED: To provide an inexpensive and highly stable hydrodynamic fluid bearing device having less friction loss and wear at starting/stopping. SOLUTION: The hydrodynamic fluid bearing device comprises a sleeve 2, a shaft 1 rotatable relative to the sleeve 2, and lubricating fluid 5 fil...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIOKA NORIFUMI, HIYO AKIRA, OSAWA HARUSHIGE, KITAHIRA TOMOJI
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DYNAMO-ELECTRIC MACHINES ELECTRICITY ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERATION HEATING LIGHTING MECHANICAL ENGINEERING ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an inexpensive and highly stable hydrodynamic fluid bearing device having less friction loss and wear at starting/stopping. SOLUTION: The hydrodynamic fluid bearing device comprises a sleeve 2, a shaft 1 rotatable relative to the sleeve 2, and lubricating fluid 5 filled in a gap between the shaft 1 and the sleeve 2. In one of an inner peripheral face 2a of the sleeve 2 and the outer peripheral face of the shaft 1, a big gap portion 10 having a big gap to the opposite peripheral face, a small gap portion 12 having a small gap to the opposite peripheral face, and a separation groove 18 are formed. The ratio (θp/θ1) of a peripheral angle θpof a recessed portion having the big gap portion 10 and the separation groove 18 combined, to a peripheral angle θ1of the small gap portion is set in a range of 2.3-4.0. COPYRIGHT: (C)2007,JPO&INPIT