球面軸受とスラスト軸受で構成される複合形静圧軸受の解析

ピストンポンプ・モータにおけるスリッパ軸受部のモデル化

抄録

A slipper in piston pumps and motors is modeled as a bearing system combined with spherical and thrust hydrostatic bearings. The tribological characteristics of the bearing in fluid film lubrication are examined theoretically in an unsteady state. The equations of the load-carrying capacity, recess pressure, leakage flow rate, frictional torque and power loss with a capillary or orifice restrictor are formulated. The motion of the hydrostatic slipper is simulated numerically with a time-lag condition of loads. The effects of the operating conditions and the bearing geometry on the dynamic characteristics are discussed. In conclusion, the time-lag between the supply pressure and load affects notably changes in the clearance and rotational speed. The preceding change in load causes larger clearance during the low pressure period. A decrease in bulk modulus or an increase in the recess volume yields obvious changes in the clearance. As the supply pressure increases, the clearance changes largely and the mean power loss increases substantially.