Abstract
An axial piston hydraulic motor with a tripod joints mechanism is introduced to improve compactness and starting torque in conventional types of motor. If the mechanism is applied in transmission torque to motor shaft, its friction torque loss would be drastically reduced and mechanical efficiency would be improved because the motion of tripod joints mechanism is relatively smaller than that of the conventional plunger motor. In particular, kinematics analysis for the mechanism is done as a preliminary study to investigate the feasibility of the mechanism in the axial piston motor. General formulas are derived from the displacement and velocity analysis of that mechanism, showing relationships between output shaft and shoe holder motion. A series of numerical calculations are carried out for a medium size motor with 160cc/rev using the formulas and their graphical plots are shown as well.
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