FORMATION OF A FLUID FILM BETWEEN A VALVE PLATE AND A CYLINDER BLOCK OF PISTON PUMPS AND MOTORS: (2ND REPORT, A VALVE PLATE WITH HYDROSTATIC PADS).

Abstract

A new method for designing the valve plate of axial piston pumps and motors is presented. By adopting a valve plate with hydrostatic pads, fluid film lubrication can be realized on the sliding part between the plate and the cylinder block over a wide range of operating conditions. This is in the rare case of a valve plate with conventional hydrodynamic pads. The effects of the main related dimensions and the operating conditions are numerically clarified, and the supporting of the cylinder block is also discussed.