Patent ID: 8115356

Claim:
A fluid dynamic bearing system having a first conical bearing and a second conical bearing working in opposition to the first conical bearing, the conical bearings being disposed along a stationary shaft ( 12 ), and the first conical bearing having a first bearing cone ( 14 ) disposed on the shaft ( 12 ) having bearing surfaces extending at an angle α to the rotational axis ( 50 ), and a first bearing bush ( 16 ) having a tapered bearing bore and bearing surfaces that are separated by a first bearing gap filled with liquid bearing fluid ( 20 ) from the bearing surfaces of the first bearing cone ( 14 ), and the second conical bearing having a second bearing cone ( 26 ) disposed on the shaft ( 12 ) having bearing surfaces extending at an angle β to the rotational axis ( 50 ), and a second bearing bush ( 28 ) having a tapered bearing bore and bearing surfaces that are separated by a second bearing gap ( 32 ) filled with liquid bearing fluid from the bearing surfaces of the second bearing cone ( 26 ), wherein the bearing surfaces of the first conical bearing are smaller in surface area than the bearing surfaces of the second conical bearing and that angle a is greater than angle β, and further characterized in that an end of the stationary shaft adjoining the second conical bearing is fixed in a baseplate.