动压气浮球轴承承载力分析

 本文采用曲面间的保角变换,将球面润滑问题变换为平面润滑问题,导出等角螺线槽球形轴承的承载能力和气膜刚度的近似解析表达式和最佳槽型参数。本文结果适用于小压缩数和小偏心的情况。

LOAD-CARRYING CAPACITY ANALYSIS OF GASDYNAMIC SPHERICAL BEARINGS

The gasdynamic bearing with spiral grooves is a type of bearings which play an important role in development of machinebuilding industry. By using the conformal mapping method for curved surfaces, the lubricated spherical surface with a spiral groove pattern is transformed into the lubricated plane with a parallel straight groove pattern, and the equation describing the gas film lubrication between two spherical surfaces is reduced to the Reynolds equation controlling the lubricating film behaviour between two plane strips. By applying Whipple's theory on the recurrent pattern of parallel grooves, some formulae for the axial and radial load-carrying capacity or the gas-film stiffness of the spherical spiral groove bearings are derived and the optimums of the angle of the groove, the ratio between groove width and ridge width, the ratio between the film height above the bottom of groove and the height above the ridge and the relative width of the groove pattern are given. The formulae given in this paper are applicable for the hydrodynamic bearing with small compressibility number and small eccentricity,