A transmission system is to consist of a variable-capacity pump and a fixed-capacity motor. The circuit is to deliver a

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A transmission system is to consist of a variable-capacity pumpand a fixed-capacity motor. The circuit is to deliver a constantpower of 45 kW over a speed range of 4000 to 8000 rev/min. Themaximum permissible pressure is 172 bar and the efficiency oftransmission of the pipes and valves between the pump and motor isestimated as 60%. Assuming a volumetric efficiency of 90% and anoverall efficiency of 80% for both pump and motor, determinesuitable maximum capacities for both units, maximum oil flow rate,minimum pressure at the pump delivery and the motor torqueassociated with this pressure. Assume a pump shaft speed of 1460rev/min.
Since the speed range quoted above is high for hydraulic motors,determine the new capacity requirements of units employed in thecircuit shown in the diagram to perform exactly the same duty.