Introduction of Hydraulic Motor

The hydraulic motor is an actuating element of the hydraulic system, which transforms the liquid pressure energy provided by the hydraulic pump into the mechanical energy (torque and speed) of its output shaft. The fluid is the medium for transmitting force and motion.

Hydraulic motor, also known as oil motor, is mainly used in injection molding machinery, ships, cranes, engineering machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, marine machinery, petrochemical industry, port machinery, etc.

The use of motor

The hydraulic motor is also called the oil motor, mainly used in injection molding machinery, ships, cranes, engineering machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, marine machinery, petrochemical, port machinery, etc.

High-speed motor gear motor has the advantages of small size, lightweight, simple structure, good workmanship, insensitive to oil pollution, impact resistance, and small inertia. Disadvantages include large torque pulsation, low efficiency, small starting torque (only 60%-70% of the rated torque), and poor low-speed stability. If you want to buy hydraulic motors, MyMRO has hydraulic motors for sale for you to choose from.

Features of Hydraulic Motors

From the point of view of energy conversion, the hydraulic pump and the hydraulic motor is 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, and therefore 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.

Structure Form of Hydraulic Motor

Blade Type

Due to the action of pressure oil, the force imbalance makes the rotor produce torque. The output torque of the vane-type hydraulic motor is related to the displacement of the hydraulic motor and the pressure difference between the inlet and outlet of the hydraulic motor, and its rotational speed is determined by the flow size of the input hydraulic motor. Because the hydraulic motor is generally required to be able to forward and reverse, the vane hydraulic motor blade to radial placement.

In order to make the blade root always through the pressure oil, in the return, the pressure oil cavity into the blade root pathway should be set up check valve, in order to ensure that the blade-type hydraulic motor in the pressure oil into the normal start, must make the top of the blade and stator inner surface close contact to ensure a good seal, so in the blade, root should be set up preload spring. The vane-type hydraulic motor is small in size, has small rotating inertia, and sensitive action, and can be applied to the occasion of high commutation frequency; but the leakage is larger, and unstable at low-speed work. Therefore, the vane-type hydraulic motor is generally used for high speed, small torque, and sensitive action requirements.

Radial Plunger Type

Radial piston hydraulic motor working principle, when the pressure oil through the window of the fixed oil distribution shaft 4 into the bottom of the cylinder block plunger, the plunger is outward, tightly against the inner wall of the stator, due to the stator and the cylinder block there is an eccentric distance. At the contact between the plunger and the stator, the reaction force of the stator on the plunger can be decomposed into two parts. When the oil pressure at the bottom of the plunger is p, the plunger diameter is d, and the angle between the force and X, the force produces a torque on the cylinder, so that the cylinder rotates. The cylinder then through the end of the drive shaft connected to the external output torque and speed. The above analysis of a plunger to produce torque, due to the role of several plungers in the pressure oil area, the torque generated in these plungers all make the cylinder rotate and output torque. A radial plunger hydraulic motor is mostly used for low-speed large.