DYNAMISCHE GASDRUCKLAGERVORRICHTUNG, VERFAHREN ZUR HERSTELLUNG DIESER VORRICHTUNG UND VERFAHREN ZU SEINER VERWENDUNG

摘要

The transverse cross section of a shaft (1) perpendicular to the axis O has a shape defined by closed curves having a plurality of maximum points (M1, M2, M3) at which distances from the axis O which is located at the center become maximum and a plurality of minimum points (N1, N2, N3) at which the distances from the axis become minimum. The transverse cross section has a groove-forming region in which at least one groove (1b1) is formed between maximum points M1 and M2. When a bearing (2) rotates counterclockwise relative to the shaft (1), the groove (1b1) is so arranged that the outer peripheral length (a1) in the forward direction of rotation is longer than the outer peripheral length (b1) in the reverse direction of rotation. There is thus obtained a dynamic-pressure gas bearing structure which prevents scuffing between the shaft and the bearing by shifting the shaft and the bearing into a noncontact state at a low rotational speed.