Hydrodynamic pressure bearing for spindle motor of disk drive, provides bearing clearance with groove between sleeve and plate, to generate pressure larger than atmospheric pressure

摘要

A counter support plate (30) is non-rotatably coupled with a bearing sleeve (12) through which a shaft (14) is inserted, such that a bearing clearance (50) is provided between the sleeve and plate. The bearing clearance filled with bearing liquid, comprises grooves to generate pressure larger than the atmospheric pressure.