Abstract
In this paper, bearing performances of gas bearings with double-plane admission are evaluated. It is well known that physical meaning of bearing performances are made clearer by the use of single-plane admission. But they are not practical when used as a machining tool. Therefore, considering the high stiffness and prevention of pneumatic hammer occurrings, each pocket in the exit of the restrictor (inherently compensated effects are included=hybrid restrictor) should be made shallower. The bearing performances (stiffness, damping, and journal center locus) with hybrid restrictor are calculated, and they are also compared with orifice type bearing and inherently compensated bearing. Fllowing conclusions are obtained : (1) Hybrid type of maximum bearing stiffness is 1.4 times as large as inherently compensated and 1.1 times as large as orifices. (2) The clearance where the maximum stiffness is obtained exists in full stable region by using a shallower pocket. (3) As the shaft response characteristics mainly depend on damping magnitude, the pocket depth as large as the operating clearance is desirable.
