Patent ID: 9214182
Filing Date: 2015-12-15
Classification: F16C,G11B,H02K

Abstract:
1. A fluid dynamic bearing comprising: a bearing bush and a shaft that are rotatable with respect to each other about a common rotational axis; a bearing gap that is disposed between associated bearing surfaces and is filled with a bearing fluid, wherein the bearing surfaces form at least one fluid dynamic radial bearing; a rotor component disposed on the shaft; a stopper component that is disposed on the shaft and to which the bearing bush adjoins; an annular gap that is formed between mutually facing surfaces of the bearing bush and the stopper component, filled with the bearing fluid and connected to the bearing gap and extending substantially in a radial direction, wherein mutually facing surfaces of the bearing bush and the stopper component are formed such that the axial extension of the annular gap continuously tapers over substantially all its course, narrowing radially outwards; and a recirculation channel that ends directly opposite of a cover plate and that is separated from an outside circumference of the stopper component by a bridge, wherein a lower mouth of the recirculation channel is separated from the annular gap and ends at a rim of the cover plate in an undercut disposed in the bearing bush or in an annular recess in the cover plate and wherein the smallest inner radius of the recirculation channel is larger than the largest outer radius of the stopper component, when measured from the rotational axis.