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What's the difference between Hydraulic pumps and Hydraulic Motor?

2023-10-17

Hydraulic Motor and hydraulic pump similarities:

(1) In principle, the Hydraulic Motor and hydraulic pump are reversible. If the hydraulic energy (pressure and flow) is output when the motor is used, this is a hydraulic pump; If pressure oil is inputted, mechanical energy (torque and speed) is outputted, the Hydraulic Motor is changed.

(2) Structurally, they are similar.

(3) In terms of working principle, both of them use the change of sealing working volume for oil absorption and oil discharge. For the hydraulic pump, the working volume increases when the oil absorption, the working volume decreases the pressure oil discharge. For Hydraulic Motor, high pressure oil is entered when the working volume increases, and low pressure oil is discharged when the working volume decreases.

The difference between Hydraulic Motor and hydraulic pump:

(1) The Hydraulic pump is an energy device, while the Hydraulic Motor is the executing element. Hydraulic pump is the mechanical energy of the motor into hydraulic energy conversion device, output flow and pressure, hope high volume efficiency; Hydraulic Motor is a device that converts the pressure energy of a liquid into mechanical energy, with the output torque and speed, which is expected to be high mechanical efficiency.

(2) The Hydraulic Motor output shaft must be able to turn forward and reverse, so its structure is symmetrical; And some hydraulic pump (such as gear pump, blade pump, etc.) steering has clear provisions, can only one-way rotation, can not change the direction of rotation.

(3) Hydraulic Motor has separate oil leakage ports in addition to oil inlet and outlet ports; The hydraulic pump generally has only the inlet and outlet (except the axial piston pump), and the internal leakage of oil is communicated with the inlet.

(4) The volumetric efficiency of Hydraulic Motor is lower than that of hydraulic pump.

(5) Usually the working speed of the Hydraulic pump is relatively high, but the Hydraulic Motor output speed is low. In addition, the oil suction mouth of the gear pump is large, and the oil discharge mouth of the gear Hydraulic Motor is the same size.

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