1.The difference between hydraulic motor and hydraulic pump
In principle, hydraulic motors and hydraulic pumps are reversible. Hydraulic pump-driven by a motor, output is pressure energy (pressure and flow); hydraulic motor-input pressure oil, output is mechanical energy (torque and speed).
2.From the structural point of view, hydraulic motors and hydraulic pumps are similar.
The working principle of the 3 hydraulic motor and hydraulic pump is to use the change of the sealed working volume to suck and discharge oil. Hydraulic pump-suction oil when the working volume increases, and discharge high-pressure oil when it decreases; hydraulic motor-high-pressure oil enters when the working volume increases, and low-pressure oil is discharged when the working volume decreases.
The difference between hydraulic pump and hydraulic motor
1.Hydraulic pump is an energy device, and hydraulic motor is an actuator.
2.The suction chamber of the hydraulic pump is generally vacuum (in order to improve oil absorption and cavitation resistance), usually the inlet size is larger than the outlet, and the pressure of the hydraulic motor discharge chamber is slightly higher than the atmospheric pressure. There is no special requirement, and the inlet and outlet sizes can be the same .
3.The structure of the hydraulic pump needs to ensure the self-priming ability, but the hydraulic motor does not have this requirement.
4.The hydraulic motor needs to be positive and negative (the internal structure needs to be symmetrical), and the hydraulic pump generally rotates in one direction.
The bearing structure and lubrication form of the
5.hydraulic motor must be used in a wide speed range. Although the speed of the hydraulic pump is relatively high, the change is small, so there is no such demanding requirement.
6.Hydraulic motor needs to overcome a large static friction force when starting, so it requires large starting torque, small torque pulsation, and small internal friction (for example, the number of teeth of a gear motor cannot be as small as a gear pump).
7.Hydraulic pump-hope the volumetric efficiency is high; hydraulic motor-hope the mechanical efficiency is high.
