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Working Principle of Hydraulic Motor

Issuing time:2020-11-03 10:39Author:宁波中意液压马达

A, hydraulic motor characteristics


Hydraulic motors can be single or double, quantitative or variable. Because of the difference in structure, the basic characteristics and applications of different hydraulic motors are different.


The gear motor has poor airtightness, low capacity and high efficiency, and low vapor pressure; however, its structure is simple and the price is low. Blade motor small size, small inertia torque, nimble posture; but the same capacity and high efficiency is not high, and mechanical equipment characteristics are soft, low-speed gear unstable. Therefore, it is suitable for medium speed, torque is not big, provisions for starting, phase change often place. (3) Shaft diameter piston pump motor capacity and high efficiency, large speed range, and low-speed reliability; but the impact resistance is a little weak. However, the impact resistance is weak, and it is common in the software of high pressure system. (4) low-speed large-torque axial piston pump motor exhaust volume, large volume, low speed ratio, without reducer, can be used immediately to drive the load.


Second, the principle of hydraulic motor


Hydraulic motors and hydraulic pumps are identical in principle, as they all convert energy according to the volume shift in the sealed working chamber.


From the basic principle, in addition to the valve type hydraulic pump (with irreversible), other ways of hydraulic pump and hydraulic motor can be universal. The following vane type hydraulic motor as an example, the principle of hydraulic motor for simple details.


High quantity vane type hydraulic motor construction is generally double effect quantitative analysis motor, in the figure, when the working pressure oil into the pressure oil cavity, in the vane 1, 3, 5, 7, one side effect has the working pressure oil, the other side for the oil discharge cavity of the bottom pressure oil. Because the blade 1, 5 bearing force total area more than the blade 3, 7, and then by the blade bearing force difference composition of the torque to promote the motor rotor to do clockwise rotation. Change the working pressure oil into the direction, the motor rotates in the opposite direction.


Third, the blade type hydraulic motor


Contrast with the vane pump, the vane type hydraulic motor's vane telescopic type in addition to rely on the working pressure oil effect, but also to rely on the interaction of the yellow bullet force to make the vane card tight in the motor stator inner surface, due to the start, motor rotor does not rotate, no centripetal force, such as the vane is not close to the motor stator inner surface, the oil inlet cavity and the oil discharge cavity intercommunication, it can not produce steam pressure, and can not output torque. Therefore, the torque bounce should be set at the root of the vane.


Another structural feature of the vane hydraulic motor is that the vane is axially placed in the motor rotor, due to the motor regulations positive, flip. In addition, in order to better make the bottom of the vane from start to finish through the gear oil, will not be harmed by the hydraulic motor rotation orientation, in the back, pressure oil chamber through the root of the vane channel, should be set this product. Blade type hydraulic motor small size, inertia torque small, posture dexterity, suitable for phase change frequency higher places; But its leakage is very large, low-speed work unstable. Therefore, the vane hydraulic motor is generally used for high speed ratio, small torque and posture dexterity of the place regulations.


Four, axial piston pump hydraulic motor


Low-speed high-torque hydraulic motors are mostly axial piston pump type. They have a large exhaust volume, output torque, low speed ratio, low-speed gear reliability, some low-speed gear to do every minute of child or even zero a few revolutions, so it can immediately and work in the organization of the connection, without speed reduction equipment, so that the transmission mechanism is greatly simplified. Widely used in medium and heavy machinery and equipment.


Fifth, the hydraulic motor and hydraulic pump different points


① Similarities: hydraulic motors and hydraulic pumps are the same in principle, all according to the sealed operation of the cavity capacity shift to complete the energy conversion.


② Differences.


Hydraulic motors have a lower building volume ratio than hydraulic pumps. Moreover, the output speed of hydraulic motors is lower than that of hydraulic pumps. Hydraulic motors have symmetrical structure and can be rotated forward and reverse. However, most of the hydraulic pumps have only irreversibility. In addition to the oil inlet hole and oil emergence port, hydraulic motors also have oil drain holes, but hydraulic pumps do not.