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Temperature and behavior of a piston motor slipper were examined using a test rig. The experimental setup comprised a tester, a hydraulic circuit, control units, and measuring instruments. The tester included a servomotor and a chamber enclosing two piston assemblies with slippers, a rotating disk, displacement sensors, and thermocouples. The sliding surface diameter of the test slipper was 32 mm; the test oil was hydraulic oil with VG46. Tests were conducted at supply pressures up to 35 MPa, rotational speeds up to 26.7 s −1 , and oil temperature of 30-50°C. The pad temperature increased with the supply pressure and rotational speed. The pad established a temperature gradient, being maximized near the slightly-outer trailing edge and minimized near the leading edge. The temperature differences were influenced by the rotational speed, but were almost independent of the supply pressure.

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No abstract

In swash plate type piston pumps and motors, the slippers are used under heavy load. So the slippers are designed as a hydrostatic bearing to ensure reliability. However slippers behavior during operation is very complex, we must take into consideration rapid changes in the hydraulic, centrifugal force and oil-film lubrication of sliding parts. In this study, a test for slippers was conducted under quasi-static state and analysis to simulate it was performed. By considering the elastic deformation of a slipper due to hydraulic pressure in the analysis, analysis results of center displacements of the slipper are in good agreement with the experimental results. In the analysis, multi body dynamics model was coupled with hydrodynamic analysis of oil-film, which makes it relatively easy to take into account effect of other mechanical components and dynamic changes．This technique can also be applied to the analysis that takes into account the other components of the pump motor.