Influence of the flow area of distribution systems on changing the operating parameters of planetary hydraulic motors

Predicting changes in the operating parameters of a planetary hydraulic motor is an urgent direction for improving its design. The physical and mathematical models of the planetary hydraulic motor have been developed, which make it possible to simulate the processes occurring under operating conditions. A design scheme and a mathematical apparatus have been developed for determining the pressure and leaks of the pressure fluid in the gap formed by the end surfaces of the distributors, which make it possible to study the change in the operating parameters of the hydraulic motor. By studying the features of the distribution system of a serial hydraulic motor, it was found that insignificant fluctuations in the flow area (up to 3%) cause rather large (up to 71%) pressure fluctuations. That causes the loss of fluid passing through the hydraulic motor up to 10% and fluctuations in the angular velocity of the output shaft – up to 11%. The absence of pressure fluctuations in the discharge line of the distribution system of the modernized hydraulic motor ensures the stability of its operating parameters. The results of the studies carried out make it possible to predict changes in the operating parameters of planetary hydraulic motors operating as part of a hydraulic drive at the design stage.