Abstract
Lately, the power density (power/weight) of hydraulic equipment has been increased as a result of research developments. To increase the power density of swashplate type axial piston motors (hereinafter referred to as motors), high pressure and speedy operation are necessary. As for the high pressure state, measures must be taken against increased leakage flow rate and over-rigidity of the motors. Therefore, in the present stage, the motors should not be rigid during application of high pressure.In the previous report, we described a theoretical analysis of elastohydrostatic lubrication of piston balls and slipper bearings in motors, at a swashplate angle of 0° with slipper floating on the oil film.In this report, the leakage flow rate between a slipper and swashplate were measured with change in slipper pad thickness and supply pressure, as identification of the theoretical analysis. The measured leakage flow rate was in qualitative agreement with the results of theoretical analysis. Furthermore, the leakage flow rate was measured with change in the swashplate angle. It was found that the tendency of the leakage flow rate with the change in slipper pad thickness at swashplate angle β≠0° was similar to that at β=0°.
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