Patent ID: 8562220

Claim:
A fluid dynamic bearing system having a first conical bearing and a second conical bearing working in opposition to the first conical bearing, wherein the two conical bearings are disposed along a stationary shaft ( 12 , 212 ), wherein the first and the second conical bearing each has: a bearing cone ( 14 ; 114 ; 214 ; 314 ) disposed on the shaft having bearing surfaces ( 14 a ; 114 a ; 214 a ; 314 a ); a bearing component ( 215 ; 315 ; 16 ) having an annular rim ( 24 ; 124 ; 224 ; 324 ) that forms a conical counter bearing having bearing surfaces ( 215 a ; 315 a ; 16 a , 116 a ); a bearing gap ( 20 ; 120 ; 220 ; 320 ) filled with a bearing fluid that separates the bearing surfaces of the bearing cone and the bearing surfaces of the bearing component from one another; a first open end of the bearing gap ( 20 ; 120 ; 220 ; 320 ), a first sealing gap ( 22 ; 122 ; 222 ; 322 ) that is partially filled with bearing fluid and seals the first open end of the bearing gap, wherein the bearing fluid in the first sealing gap ( 22 ; 122 ; 222 ; 322 ) forms a fluid meniscus ( 23 ; 123 ; 223 ; 323 ), characterized in that the first sealing gap ( 22 ; 122 ; 222 ; 322 ) is bounded by sealing surfaces ( 14 b ; 144 b ; 214 b ; 314 b ) of the bearing cone ( 14 ; 114 ; 214 ; 314 ) and associated sealing surfaces ( 215 b ; 315 b ; 16 b ; 116 b ) of the bearing component ( 215 , 315 ; 16 ), wherein the smallest radius R 1 of the sealing surfaces ( 215 b ; 315 b ; 16 b ; 116 b ) of the bearing component ( 215 ; 315 ; 16 ) is larger than the largest outer radius R 2 of the bearing cone ( 14 ; 114 ; 214 ; 314 ) and larger than the greatest distance R 3 of the fluid meniscus ( 23 ; 123 ; 223 ; 323 ) from the rotational axis ( 42 ; 242 ).