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Principles of Hydraulic Systems Design, Second Edition by Peter Chapple

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CHAPTER 2

HYDROSTATIC PUMPS AND MOTORS

2.1  INTRODUCTION

Power transmission pumps in fluid power systems are usually hydrostatic or positive displacement units, which convert mechanical power into fluid power, the most common types being gear pumps, vane pumps, and piston pumps. In these pumps, fluid is transferred through the machine in discrete volumes, for example, a gear tooth cavity. The pump size and speed determine the fluid flow rate.

Hydrostatic pumps are sources of flow so that when they are connected to a hydraulic motor, the outlet pressure will rise so the flow can cause the motor to rotate against the load torque. Hydrostatic motors convert fluid power into mechanical power so rotation of the output shaft can take place against ...

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