Performance judgment method for dynamic pressure bearing and dynamic pressure bearing

摘要

First, an axial clearance is measured. Next, lubricating oil is filled between a sleeve and a shaft, and the shaft is disposed such that a flange is positioned above a shank. Further, in a state where the shaft rotates at a rated rotation speed (a predetermined rotation speed), an axial clearance b between the flange and a surface facing a receiving surface of the flange through a flange housing space in the sleeve is measured. Finally, a dynamic pressure bearing satisfying the condition 0.3 ‰¤ b/a ‰¤ 0.55 is judged as a dynamic pressure bearing not having leakage of lubricating oil and abnormal abrasion.