Hydraulic pumps and hydraulic motors are different:
The hydraulic pump uses the motor to drive the output pressure energy (pressure and flow);
The hydraulic motor input pressure oil output is mechanical energy (torque and speed).
Difference 1: Different output methods
The hydraulic pump is a conversion device that converts the mechanical energy of the motor into hydraulic energy. It outputs flow and pressure, and it is hoped that the volumetric efficiency is high; the hydraulic motor is a conversion device that converts the pressure energy of the liquid into mechanical energy, and outputs torque and rotational speed. It is hoped that the mechanical efficiency is high. .
Therefore, the hydraulic pump is the energy device, and the hydraulic motor is the actuator.
Difference 2: The output shaft turns differently
The steering of the output shaft of the hydraulic motor must be able to rotate forward and reverse, so its structure is symmetrical; while some hydraulic pumps (such as gear pumps, vane pumps, etc.) have clear regulations for steering, which can only be rotated in one direction, and cannot be arbitrarily changed. direction.
Difference 3: The oil port configuration is different
In addition to the oil inlet and outlet, the hydraulic motor has a separate oil leakage port; the hydraulic pump generally only has the oil inlet and outlet (except for the axial piston pump), and the leakage oil in it is connected with the oil inlet.
Difference 4: The volumetric efficiency of the motor is different
The volumetric efficiency of hydraulic motors is lower than that of hydraulic pumps.
Difference 5: different speeds
Usually the working speed of the hydraulic pump is relatively high, while the output speed of the hydraulic motor is low.
Difference 6: The specifications of the oil suction port are different
The oil suction port of the gear pump is large and the oil discharge port is small, while the suction port and the oil discharge port of the gear hydraulic motor are the same size.
Difference 7: Different functions
The role of the pump: The pump is mainly used to transport liquids such as water, oil, acid-base liquid, emulsion, suspension emulsion and liquid metal, as well as liquid, gas mixture and liquid containing suspended solids.
The role of the motor: the energized coil is rotated in the magnetic field to drive the starter rotor to rotate, and the pinion on the rotor drives the engine flywheel to rotate, thereby driving the crankshaft to rotate.
