Hydraulic Pumps and Hydraulic Motors

From the point of view of energy conversion, the hydraulic pump and the hydraulic motor are reversible hydraulic components, so any kind of hydraulic pump input working fluid can make it into hydraulic motor condition; Conversely, when the hydraulic motor spindle is driven by external torque rotation, can also be changed into hydraulic pump condition. Because they have the same basic structural elements - closed and can be periodically changing the volume and the corresponding oil distribution mechanism. However, because the hydraulic motor and hydraulic pump working conditions are different, their performance requirements are not the same, so the same type of hydraulic motor and hydraulic pump between, there are still many differences. First, the hydraulic motor should be able to forward and reverse, thus requiring its internal structure symmetry; the hydraulic motor speed range needs to be large enough, especially for its minimum stable speed has certain requirements. Therefore, it usually uses rolling bearings or hydrostatic plain bearings; Secondly, the hydraulic motor because of the input pressure oil conditions of work, thus do not have to have the self-priming ability but needs a certain initial sealing in order to provide the necessary starting torque. Because of these differences, making the hydraulic motor and hydraulic pump in the structure is relatively similar, but can not be reversible work. Today many stores will have hydraulic pumps and hydraulic motors for sale.

A hydraulic pump is a kind of energy conversion device, converting mechanical energy into pressure energy of oil, and a hydraulic motor is also a kind of energy conversion device, converting pressure energy of oil into mechanical energy, an executive element. So what are the common points and differences between the two? Let's take a look.

Common Points of Hydraulic Motor and Hydraulic Pump

In principle, the hydraulic motor and hydraulic pump are reversible, if driven by an electric motor, the output is pressure energy (pressure and flow) which is the hydraulic pump; if the input pressure oil, the output is mechanical energy (torque and speed), it becomes a hydraulic motor.
From the structural point of view, the two are similar.
hydraulic motor and hydraulic pump working principle is the use of the seal working volume changes for oil suction and discharge. For the hydraulic pump, the working volume increases when the suction oil is, and the working volume decreases when the discharge of high-pressure oil is. For the hydraulic motor, when the working volume increases into the high-pressure oil, the working volume decreases when the discharge of low-pressure oil.

The Difference Between Hydraulic Motor and Hydraulic Pump

A hydraulic pump is a conversion device to convert the mechanical energy of the motor into hydraulic energy, output flow, and pressure, and hopefully high volumetric efficiency; a hydraulic motor is a conversion device to convert the pressure energy of the hydraulic system liquid into mechanical energy, output torque and speed, and hopefully high mechanical efficiency. Therefore, the hydraulic pump is an energy device, and the hydraulic motor is an executive component.
hydraulic motor output shaft steering must be able to forward and reverse, and like gear pumps and vane pumps and other hydraulic pumps have clear provisions for steering, only one-way rotation, can not be arbitrary. The hydraulic motor is the hydraulic energy converted into continuous rotary motion mechanical energy implementation components.
Hydraulic motor and hydraulic pump with the same basic structural elements - closed and can change the volume of the cycle and the corresponding oil distribution mechanism.

From the working principle, the hydraulic motor and hydraulic pump are relying on the change of the volume of the sealed working chamber and work, but because of the use of the two different purposes, there are many differences in structure, generally can not be directly reversible common, only a few pumps can be used for hydraulic motor.