Fluid dynamic bearing system for rotatably supporting spindle motor for driving storage disk drive, has sealing components with stationary and movable bearing components forming compensation gaps, and sealing gaps, respectively

摘要

The system has a stationary bearing component i.e. bearing plate (16) or bearing flange (18), and a movable bearing component i.e. hub (20) or bearing sleeve (14), forming a bearing gap (24). A pair of sealing units includes a pair of sealing components (38, 46) that are arranged at the stationary bearing component. The sealing components together with the stationary bearing component form a pair of compensation gaps (42, 50) i.e. capillary gap, and together with the movable bearing component form a pair of sealing gaps (40, 48) i.e. capillary seal.