Patent ID: 6170988
Filing Date: 2001-01-09
Classification: F16C,H02K,Y10S

Abstract:
A self-acting air bearing apparatus comprising:a shaft;a bearing installed around the shaft;wherein one of the shaft and the bearing rotates with respect to the other and rotation generates dynamic air pressure; andwherein an abrasion-generated substance is generated by solid contact of the shaft and the bearing and by rotation between the shaft and the bearing, the abrasion-generated substance forming a lubricant between the shaft and the bearing;wherein a compound material including a dispersion particle, different in hardness from a matrix and lower in wettability than the matrix or an oxide of the matrix, is used as a material of the shaft and the bearing to generate the lubricant effectively;wherein a Ni--P electroless composite plating where SiC is used as the dispersion particle is used as a material of the shaft and the bearing, and a volume dispersion ratio in plated film is controlled by particle density in plating liquid during filming, andwherein the following two conditions are satisfied as the dispersion ratio in the plated film of the shaft and the bearing:1) the volume dispersion ratio in the plated film of the bearing is 10% or more;2) a ratio of the dispersion ratios in the plated films of the shaft and the bearing, (the volume dispersion ratio of the shaft)/(the volume dispersion ratio of the bearing), is in a range between 0.7 and 1.4.