Fluid dynamic bearing system for spindle motor of hard disk drive, has bearing sleeve, shaft pivotably supported in bearing bore of bearing sleeve shaft, rotor component connected with shaft, and bearing gap filled with bearing fluid

摘要

The fluid dynamic bearing system has a bearing sleeve (10), a shaft (12) pivotably supported in a bearing bore of bearing sleeve, a rotor component (26) connected with shaft, and a bearing gap (14) filled with bearing fluid. An axial section (14a) is provided between opposite surfaces of shaft and the bearing sleeve, and a radial portion (14b) is provided between opposite surfaces of bearing sleeve and rotor component. The pressure-generating groove structures (34) are arranged radially outside an opening (32b) of a recirculation channel (32) on a surface of bearing sleeve or rotor component. Independent claims are also included for the following: (1) a spindle motor with a stator; and (2) a hard disk drive.