Production method of hydrostatic gas radial bearing

摘要

PROBLEM TO BE SOLVED: To provide a static pressure gas radial bearing capable of uniformly discharging compressed air from the whole face of a bearing face, and achieving high restriction effect.;SOLUTION: A static pressure gas radial bearing 1A includes a cylindrical first metallic powder sintered layer portion 2A applying an inner peripheral face 21 as a bearing face, a second metallic powder sintered layer 3 formed on an outer peripheral face 22 of the first metallic powder sintered layer portion 2A and having a porosity larger than that of the first metallic powder sintered layer portion 2A, and a back metal 4 formed on an outer peripheral face 32 of the second metallic powder sintered layer portion 3. The first and second metallic powder sintered layer portions 2A and 3 use, as a formation material, spherical bronze alloy powder having the almost same average particle size. The first metallic powder sintered layer portion 2A is disposed in a metallic sleeve as a core, and the spherical bronze alloy powder is filled into a clearance gap between the core and the sleeve, and sintered at a lower temperature and in a shorter period than those for the first metallic powder sintered layer portion 2, so that the second metallic powder sintered layer portion 3 has porosity larger than that of the first metallic powder sintered layer portion 2A.;COPYRIGHT: (C)2014,JPO&INPIT