OPERATION CONTROL DEVICE IN HYDRAULIC CLOSED CIRCUIT

摘要

PURPOSE:To greatly relieve shocks during acceleration, by retarding the rate of decrease in the capacity of a hydraulic pump and the rate of increase in the capacity of a hydraulic motor. CONSTITUTION:A slow return valve 13 composed of a parallel circuit of a check valve 13a and a restrictor orifice 13b is disposed between a pressure reducing valve 8 and regulators 3, 5 for a hydraulic pump 2 and a hydraulic motor 4. With this arrangement it is possible to retard the rate of decrease in the capacity of the hydraulic pump 2 and the rate of increase in the capacity of the hydraulic motor 4, and therefore, it is possible to greatly relieve shocks during deceleration.