| http://www.w3.org/ns/prov#value | - Further, hydrodynamic surfaces formed on inner peripheral surfaces of these bearing projections 21 a are disposed in such a manner as to proximately oppose hydrodynamic surfaces formed on an outer peripheral surface of the fixed shaft 16, thereby forming a pair of radial hydrodynamic bearing portions RBa and RBb which are adjacent to each other in the axial direction.
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