| http://www.w3.org/ns/prov#value | - Namely, hydrodynamic surfaces formed on the inner peripheral surface of the bearing sleeve 33 are disposed in such a manner as to proximately oppose hydrodynamic surfaces formed on the outer peripheral surface of the rotary shaft 41, thereby forming the pair of radial hydrodynamic bearing portions RBa and RBb which are adjacent to each other in the axial direction.
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