Patent ID: 9033580
Filing Date: 2015-05-19
Classification: F16C

Abstract:
1. A fluid dynamic bearing system having: at least one stationary part, at least one rotating part that is supported rotatable about a rotational axis with respect to the stationary part, a bearing gap that is formed between the mutually opposing surfaces of the stationary and of the rotating part and filled with a bearing fluid, the bearing gap having two open ends, at least one fluid dynamic radial bearing and at least one fluid dynamic axial bearing that are disposed along sections of the bearing gap, and sealing means for sealing the open ends of the bearing gap, characterized in that the sealing means comprises an annular sealing gap that has one end connected to the bearing gap and one end connected to an annular reservoir and a dynamic pumping seal arranged along a section of at least one of the annular sealing gaps, the sealing gap having a maximum outside radius r wherein along the section of the pumping seal the inside radius and the outside radius of the sealing gap remain constant, wherein outside of the pumping seal the sealing gap widens into a taper wherein the inside radius of the sealing gap decreases towards the outside whereas the outside radius remains constant, and wherein the tapered end of the sealing gap widens towards the outside so that the annular reservoir is formed wherein its outside radius increases, and wherein the maximum outside radius r