ハイブリッド・スラスト軸受の熱流体潤滑解析（斜板式アキシアルピストンポンプ・モータに用いられるスリッパのモデリング）

Abstract

A thermohydrodynamic lubrication (THL) model of hybrid (hydrodynamic/hydrostatic) thrust bearings for a slipper of swashplate type axial piston pumps and motors is developed. The generalized Reynolds equation, three-dimensional energy equation and heat-conduction equation are derived, and the physical properties (density, viscosity, speci.c heat at constant pressure, thermal conductivity and thermal expansivity) of a hydraulic oil are considered as functions of temperature and pressure. The equations are solved numerically, and the THL solutions of the slipper model are compared with the isothermal solutions and the solutions of the circular thrust pad hydrostatic bearing. The e.ects of the physical properties, the revolution radius and the slipper spin on the temperature distribution, temperature rise, clearance shape and power loss are examined for both of the THL and isothermal analyses. The physical property changes in.uence on the characteristics of the slipper model rather than the characteristics of the circular pad bearing model. The THL solutions indicate that an increase in the revolution radius causes an increase in the .lm temperature and the pad inclination.