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Working Principle Of Hydraulic Motor
Apr 16, 2018

Blade type hydraulic motor

Due to the action of pressure oil, the unbalanced force causes the rotor to generate 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 the outlet of the hydraulic motor. The rotation speed is determined by the flow rate of the input hydraulic motor. Since hydraulic motors generally require positive and negative reversal, the blades of the vane hydraulic motor are placed radially. In order to ensure that the root of the blade is always filled with pressure oil, a one-way valve shall be provided on the path of the root of the return and pressure oil chamber to the root of the blade. In order to ensure that the blade type hydraulic motor can normally start after the pressure oil passes, the top of the blade must be The inner surface of the stator is in close contact to ensure a good seal, so a preloaded spring should be provided at the root of the blade. The vane type hydraulic motor is small in volume, small in moment of inertia, and sensitive in motion. It can be applied to occasions with high commutation frequency; however, it has a large amount of leakage and is unstable at low speeds. Therefore, the vane type hydraulic motor is generally used in applications where the rotational speed is high, the torque is small, and the motion is demanding.


Radial piston type hydraulic motor

The working principle of the radial piston hydraulic motor, when the pressure oil enters the bottom of the plunger in the cylinder body through the window of the fixed oil distribution shaft 4, the plunger extends outwards and tightly against the inner wall of the stator, due to the stator and The cylinder has an eccentricity. At the plunger-stator contact, the stator's reaction force to the plunger is . Force can be broken down into two components. When the oil pressure acting on the bottom of the plunger is p, the diameter of the plunger is d, and the angle between the force and X is, the force generates a torque on the cylinder and rotates the cylinder. The cylinder then outputs the torque and speed outside the transmission shaft connected to the end face.


In the above analysis of a situation in which a plunger generates torque, several plungers act on the oil pressure zone, and the torque generated on these plungers causes the cylinder to rotate and output torque. Radial piston hydraulic motor used for low speed

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