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(一)气体轴承的特点、承载机理和应用1.特点气体轴承是以气体作为润滑剂的滑动轴承。当轴承用空气来润滑时就称为空气轴承。气体与液体相比时,前者的粘度很小,平均约为后者的千分之一。此外,气体具有可压缩性。这两项差别就给气体轴承带来如下的特点: (1)轴承气膜的摩擦阻力极低,用于高速机器(例如氦液化器透平膨胀机转子的速度高达每秒几十万转)时温升有限;用于测试装置(例如滚动轴承试验台、电机扭矩校正装置
(A) the characteristics of gas bearings, bearing mechanism and application 1. Features Gas bearings are gas lubricated sliding bearings. When the bearing is air-lubricated, it is called an air bearing. When compared with the liquid gas, the viscosity of the former is very small, averaging about one thousandth of the latter. In addition, the gas is compressible. These two differences give gas bearings the following features: (1) The bearing air film has very low frictional resistance for high-speed machines (eg helium liquefier turbine expander rotors up to hundreds of thousands of revolutions per second) When the temperature rise is limited; for test equipment (such as rolling bearing test stand, motor torque correction device