| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydrodynamic pressure bearing device, eliminating performance degradation due to lowering of effective length of the bearing without any increase in evaporation quantity and scattering possibility of a lubricant. <P>SOLUTION: This hydrodynamic pressure bearing device includes: a radial bearing part and a thrust bearing part which are formed by a bearing sleeve 12 rotating round the periphery of a shaft 10 and the opposite surfaces in a bearing holding member 13; a bearing clearance gap 16 interposed between the opposite surfaces and filled with a lubricant; and an oil quantity adjusting storing part communicated with the bearing clearance gap 16 so that the fluid lubricant can flow. The oil quantity adjusting storing part is constructed in the form of an oil guide passage 18 formed by one or two or more spiral grooves and the peripheral surfaces thereto between the outer peripheral side of the bearing holding member 13 and the inner peripheral side of an outer shell member 14 provided to surround the bearing holding member 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
