A Practical Approach for Analysis of Effect of the Oil Temperature and Size Variation on the Steady-state Performance of the Bent axis Hydro-Motors

Hydraulic motor of bent axis design are commonly used in heavy earth moving machinery, mining industries and construction equipment due to their high efficiency and wider torque speed ranges. The present work is conducted in order to study the effect of oil temperature and size variations on the steady-state performances of the fixed displacement bent axis hydro-motors under a specific operating condition. In this respect, five different capacities of the fixed displacement bent axis hydro-motor (10 cc through 28 cc) are considered. The effects of the operating conditions such as oil temperature, sizes of the motor, constant load and speed on its flow and torque-losses are identified. The outcome of them on the performance of the hydro-motor is characterized. From the test data, the characteristic of the various losses co-efficient are identified. A mathematical model of the losses is established that takes into account the influences of the oil temperature, capacities of hydro-motor. Using the said model, the overall efficiency, torque loss and the slip of the different capacities hydro-motor at five different operating temperature (40⁰C through 80⁰C) are compared. It is concluded that with increase in the temperature and sizes of hydro motor, the overall performance of the hydro-motors increases. Such model may be used to describe the performance of the various sizes of hydro-motor for wide range of operating temperature. The proposed model may be useful for the practicing engineers to select the bent axis hydro-motor drive for a given application in mining industries and construction equipment.