Iranian Journal of  Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Analysis and evaluation of energy losses in a hydraulic motor with a gear structure under different working conditions

Document Type : Original Article

Author
Assistant Professor, Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Abstract
In this paper, a mathematical model is presented to determine the quantities related to energy loss in hydraulic motors under various operating conditions. To validate the accuracy of the mathematical model, a hydraulic power transmission system was designed and constructed, incorporating the M25MF motor. The findings showed that the results of solving the set of mathematical relationships to estimate the volumetric efficiency of the gear motor differ from experimental results, with average discrepancies of 3.9% and 4.1% at pressure ratios of 0.4 and 1, respectively.  However, the results of measuring the total efficiency of the M25MF motor, with the results obtained by solving the mathematical model, at pressure ratios of 0.49 and 1, differ, on average, by about 4.8 and 5.1%. Additionally, at pressure ratios of 0.4 and 1, the difference between the trend of changes in the oil flow rate entering the gear motor, resulting from the mathematical model solution and experimental measurements, was determined to be about 1.3 and 3.6%. Further investigations showed that the trend of changes in volumetric and total efficiencies of the gear motor, depending on the input shaft rotational speed, at different pressure ratios, did not include the dead zone. On the other hand, the total efficiency of the gear motor was determined to be maximum within a specific range of its output shaft speed. Meanwhile, the speed range of the motor shaft to achieve its optimal performance is affected by the difference in oil pressure in the inlet and outlet ports.
Keywords

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