Hybrid bearing for use in electrical machine of hard disk drive, has bearing gap with predetermined width in region of front end of shaft, and fluid damper device counteracting axial pre-stressing and stabilizing bearing in axial direction

摘要

The hybrid bearing has a radial bearing and an axial bearing magnetically pre-stressed in an axial direction. A shaft (14) is accommodated in a bearing sleeve (12). A bearing gap (24) is provided between the bearing sleeve and a periphery of the shaft. The bearing gap has a predetermined width in a region of a front end of the shaft, where the region is enclosed by the bearing sleeve and filled with a fluid to form a fluid damper device. The fluid damper device counteracts the axial pre-stressing and stabilizes the hybrid bearing in the axial direction.