Changing the Output Characteristics of a Planetary Hydraulic Motor

The effective use of self-propelled equipment depends on the high-quality operation of mechatronic systems with the hydraulic drive of active working bodies, for the drive of which hydraulic machines of the planetary (orbital) type are used. The factors determining the output characteristics of a planetary hydraulic motor under operating conditions were substantiated. The torque range is 45…1070 Nm; the working fluid flow rate is 70…110 l/min; the diametrical gap is 0.02…0.23 mm. Regression equations were obtained that describe changes in the hydraulic motor’s technical condition by measuring the working fluid’s flow rate, rotation speed, and pressure drop and confirm that a change in the diametrical clearance in the range from 0.02 mm to 0.16 mm does not affect its efficiency. The main parameter characterizing the technical condition (operability) of a planetary-type hydraulic motor is the rotation speed of its output shaft, which decreases not only with a decrease in flow rate but also with an increase in load and diametrical clearance. It has been established that with a diametrical gap of 0.23 mm and a working fluid flow rate of 110…90 l/min, a sharp drop in the shaft rotation speed occurs, and at values of 70 l/min, the planetary hydraulic motor does not work at all.