Hydraulic pumps and motors are designed to be operated at higher power density. The discharge pressure and the rotational speed become higher and the component size is smaller, which increase heat generation and decrease cooling of the bearing and sealing parts, while enhancing the change in the hydraulic fluids' physical properties. Consequently, a strong need exists to examine the influence of pressure and temperature on the parts' performance and to establish a component design method incorporating thermal effects. For this study, a thermohydrodynamic lubrication (THL) model of hybrid (hydrodynamic and hydrostatic) thrust bearings is developed, which is applicable to a slipper installed in swashplate-type axial piston pumps and motors.
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