Leakage Analysis and Volumetric Efficiency of Symmetrical Multiple Output Gear Motors

In order to study the leakage and volumetric efficiency of a symmetrical multi-output geared motor, the geometric displacements of the internal and external motors under different connection modes were calculated based on the internal structure of the symmetric multi-output gear motor. The main leakage paths of the motor were analyzed. By establishing a mathematical model of the leakage, general expressions of leakage under different connections were summarized. At the same time, an experimental platform was built to test the volumetric efficiency of the symmetrical multi-output geared motor. The results show that when the inlet and outlet pressure of the motor increase from 0.9 MPa to 5.9 MPa, the volumetric efficiency of the internal motor decreases from 94.2% to 80.2%, and the volumetric efficiency of the external motor decreases from 92.5% to 73.6%. The efficiency drops from 88.8% to 63.2%, and the volumetric efficiency decreases from 86.0% to 62.7% during differential connection. When the pressure difference between the inlet and outlet is 5.9 MPa, the volumetric efficiency of the internal motor alone is 80.2%, and the volumetric efficiency of the motor is 62.7%.