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AssigneeMinebea Co., Ltd.
InventorsMartin Engesser, Stefan Schwamberger
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The invention relates to a fluid dynamic bearing system having pressure-generating asymmetric surface patterns, having at least two bearing parts that are rotatable with respect to each other and form a bearing gap filled with a bearing fluid between associated bearing surfaces. The surface patterns are disposed on at least one bearing surface so that hydrodynamic pressure is generated within the bearing gap when the bearing parts rotate with respect to each other. According to the invention, each surface pattern comprises at least three sections, each section generating a pumping action in a defined direction, and the pumping actions of adjacent sections being substantially aligned in opposite directions. Due to the special geometry of the surface patterns according to the invention, tolerances in the geometry of the bearing gap have a less significant effect on the pre-defined pumping direction.
A fluid dynamic bearing having pressure-generating surface patterns, having at least two bearing parts (1, 2) that are rotatable with respect to each other and form a bearing gap (3) filled with a bearing fluid between associated bearing surfaces, the surface patterns being disposed on at least one bearing surface and generating hydrodynamic pressure within the bearing gap when the bearing parts rotate with respect to each other, characterized in that each surface pattern (9;
Dependencies are inferred from the claim text.