SINTERED BEARING, FLUID DYNAMIC BEARING DEVICE AND MOTOR COMPRISING SAME, AND SINTERED BEARING MANUFACTURING METHOD

摘要

Provided is a sintered bearing (8) having a plurality of axial grooves (8c1) equiangularly arranged in an outer peripheral surface (8c) thereof and a plurality of dynamic pressure generating grooves (8a11) equiangularly arranged in an inner peripheral surface (8a) thereof, in which a number of the plurality of axial grooves (8c1) is an integral multiple of a number of the plurality of dynamic pressure generating grooves (8a11) on the same circumference.