HYDRODYNAMIC PRESSURE BEARING SYSTEM AND SPINDLE MOTOR WITH FLUID HYDRODYNAMIC PRESSURE BEARING SYSTEM

摘要

PROBLEM TO BE SOLVED: To form a fluid trap part for preventing lubricating oil adhering to a shaft of a spindle motor from rising and scattering in a spindle motor having a hydrodynamic pressure bearing system inexpensively, easily and efficiently.;SOLUTION: This hydrodynamic pressure bearing system is equipped with a shaft 31 to which a rotating part is journaled; a bearing sleeve 32 inserted in a cylindrical hole where the shaft 31 is disposed inside; at least one bearing member 33 fitted to the outer surface of the shaft 31 for generating hydrodynamic pressure; and a fluid trap part 41 for trapping lubricating oil 12 rising along the surface of the shaft 31. The fluid trap part 41 is combined with at least one bearing member 33, and a fluid trap void 46 is formed between the fluid trap part 41 and at least the outer surface of one bearing member 33.;COPYRIGHT: (C)2005,JPO&NCIPI