| 摘要 |
The invention relates to a hydrodynamic bearing system particularly for use as a rotary bearing in a spindle motor for a hard disk drive, comprising a shaft, a thrust plate firmly connected to the shaft by means of a pressfit connection and a bearing sleeve closed at least at one end by a cover plate, the bearing sleeve enclosing the shaft and the thrust plate with a slight radial or axial spacing forming a concentric bearing gap filled with a lubricant. In the hydrodynamic bearing system according to the invention, it is provided that the outer circumference of the shaft, in the area of connection with the thrust plate, has a surface interrupted by regular depressions, preferably formed by knurling, in order to decrease the contact surface proportion of the fit surface. As an alternative, the inner circumference of the thrust plate can also be knurled in the area of connection with the shaft.
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