Patent ID: 8240917

Claim:
A fluid dynamic bearing pattern ( 60 ; 70 ; 128 ) that is disposed on at least one bearing surface of a fluid dynamic bearing ( 10 ; 126 ) comprising at least two bearing parts ( 12 , 16 , 18 , 20 ; 114 , 116 ) moveable with respect to each other along a direction of movement ( 58 ; 130 ), wherein the bearing pattern ( 60 ; 70 ; 128 ) comprises two related grooved sections ( 62 , 64 ; 72 , 74 ; 128 a , 128 b ), wherein each section ( 62 , 64 ; 72 , 74 ; 128 a , 128 b ) extends at an acute angle with respect to the direction of movement ( 58 ; 130 ) and exerts a defined pumping effect on the bearing fluid found in the bearing when the bearing parts move with respect to one another, characterized in that the first section ( 62 ; 72 ; 128 b ) is disposed at an angle α and the second section ( 64 ; 74 ; 128 a ) at an angle β with respect to the direction of movement, where α<β, wherein the first section is arranged adjacent to an open end of a bearing gap formed between the two bearing parts, and the second section is arranged towards an interior of the bearing, and wherein the groove depth of the first section is different from the groove depth of the second section.