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Characteristics of hydraulic motors


From the perspective of energy conversion, hydraulic pumps and hydraulic motors are reversibly working hydraulic components. Inputting working fluid into any hydraulic pump can change it to the working condition of the hydraulic motor.

On the contrary, when the main shaft of the hydraulic motor is driven to rotate by external torque, it can also become a hydraulic pump operating condition. Because they have the same basic structural elements - a closed but periodically changing volume and a corresponding oil distribution mechanism.

However, due to the different working conditions of hydraulic motors and hydraulic pumps, their performance requirements are also different, so there are still many differences between hydraulic motors and hydraulic pumps of the same type.

First of all, the hydraulic motor should be able to rotate forward and reverse, so its internal structure is required to be symmetrical; the speed range of the hydraulic motor needs to be large enough, especially its minimum stable speed. Therefore, it usually uses rolling bearings or hydrostatic sliding bearings; secondly, because the hydraulic motor works under the condition of input pressure oil, it does not have to have self-priming capability, but it requires a certain initial sealing to provide the necessary starting torque. Due to these differences, hydraulic motors and hydraulic pumps are similar in structure, but they cannot work reversibly.

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