AIR DYNAMIC PRESSURE BEARING STRUCTURE, ESPECIALLY CONCERNED IN SUPPORTING A REVOLUTION BODY IN AN AXIAL DIRECTION BY FORMING A HALF-SPHERICAL AIR DYNAMIC PRESSURE BEARING

摘要

PURPOSE: An air dynamic pressure bearing structure is provided to support a revolution body in axial direction by forming a half-spherical air dynamic pressure bearing by half-spherical bearing members, and to use a cylinder-shaped bearing member to support a radius direction of the revolution body, thereby obtaining a high load capacity in radius direction. CONSTITUTION: An axial direction supporting bearing unit comprises one pair of half-spherical bearing members(32a,32d) separated from each other at certain intervals at the same axis(31). A radius direction supporting bearing unit comprises as follows. A cylinder-shaped bearing member(33) is fixed to the axis(31) between the one pair of the half-spherical bearing members(32a,32d). A bearing bush member(34) is fixed to surround the half-spherical bearing members(32a,32d) and the cylinder-shaped bearing member(33) while maintaining predetermined gaps between the half-spherical bearing members(32a,32d) and the cylinder-shaped bearing member(33).