Spindle motor having a fluid dynamic bearing system

Abstract

The invention relates to a spindle motor having a fluid dynamic bearing system that comprises a base (10), a stationary shaft (14) that is connected to the base (10), a bearing bush (16) that is connected to the base (10) and disposed at a spacing about the shaft (14), a hub (18) having a sleeve-shaped part (20) and a cylindrical bore for receiving the shaft (14), a thrust plate (22)) that is disposed at one end of the sleeve-shaped part (20; 120), wherein the sleeve-shaped part and the thrust plate are disposed between an inside circumference of the bearing bush (16) and the outside circumference of the shaft (14). A bearing gap (24) containing bearing fluid is provided between the mutually opposing surfaces of the shaft (14), the hub (18), the thrust plate (22) and the bearing bush (16) that fully encloses the sleeve-shaped part (20) and the thrust plate (22) and has two open ends, there is at least one fluid dynamic radial bearing (36; 38) formed by the associated bearing surfaces of the shaft (14) and the hub (18) or the sleeve-shaped part (20), at least one fluid dynamic axial bearing (40; 42) formed by the associated bearing surfaces of the thrust plate (22), the base (10) and/or the bearing bush (16), and an electromagnetic drive system (32; 34).

Dependencies are inferred from the claim text.