The working principle of the hydraulic motor

       A vane type hydraulic motor due to the role of pressure oil, the uneven so that the rotor to produce torque. Vane type hydraulic motor output torque and the displacement of the hydraulic motor and hydraulic motor in and out of the pressure difference between the port related to the speed determined by the size of input flow of the hydraulic motor to. The hydraulic motors generally require rotating, the blades of the vane type hydraulic motor radial placed. Always pass the oil pressure in the back of the blade root, the check valve should be set on the path of the blade root pressure oil chamber Walter, in order to ensure that the vane hydraulic motor to start properly after the pressure oil Walter, to the top of the leaves and the stator surface in close contact to ensure a good seal, so in the blade root to set the preload spring. Vane type hydraulic motor, small size, small moment of inertia, quick action, be applied for to a higher frequency of occasions, but the leak was slow work instability. Vane type hydraulic motors are generally used for high speed, the torque is small and the action requires a sensitive occasion.

       2 radial piston hydraulic motor radial piston hydraulic motor works with oil axis window fixed oil pressure into the bottom of the cylinder body of the plunger, the plunger protruding from tight top live in the inner wall of the stator, due to an eccentricity of the stator and the cylinder. Contact with the plunger and the stator at the stator reaction force on the plunger. The force can be decomposed, and two contribute. When acting on the plunger at the bottom of the oil pressure is p, the plunger diameter d, the force and the angle between the X, force produces a torque on the cylinder, so that the cylinder rotation. Cylinder and then out through the end to connect the drive shaft torque and the speed. A plunger torque above analysis, several plunger in the role of the oil pressure zone, the torque generated by the plunger cylinder rotation, and the output torque. Used for low speed high torque radial piston hydraulic motor.

       3 axial piston motors, axial piston pump in addition to valve type flow, other forms of in principle can be used as a hydraulic motor, axial piston pumps and axial piston motors are reversible. Axial piston motor works, oil pan and the swash plate fixed to the motor shaft and the cylinder is connected with the rotation. When pressure oil through the oil pan with the window into the cylinder plunger hole, the plunger, the pressure on oil under extended close to the swash plate swash plate plunger to produce a normal reaction p, this force can be decomposed into The axial component and the vertical component Q. Q and phase equilibrium of fluid pressure on the plunger, and Q so that the plunger creates a torque on the cylinder center, driven by the motor shaft counterclockwise rotation. Instantaneous torque generated by the axial piston motor is pulsating. If you change the motor oil pressure input direction, the motor shaft is rotated in a clockwise direction. Swashplate angle is a change, the displacement changes not only affect the motor torque, but also affects its speed and direction. Swash plate angle, the greater the larger the generated torque, lower speed.

        4. Gear hydraulic motor gear motor to meet the requirements of the Reversible and equal access to the oil port, with the symmetry in the structure, a separate leakage oil port bearing part of the leakage of oil leads to the shell outside; in order to reduce the start friction torque, the rolling bearing; in order to reduce the torque ripple gear hydraulic motor gear ratio the number of teeth of the pump. Gear hydraulic motor by a dry sealing, Yung rent less efficient input oil pressure is not too high, you can not have a greater torque. And the instantaneous speed and torque change with the change of the location of the mesh points, so gear hydraulic motor is only suitable for the occasion for high-speed torque. Low torque uniformity usually dry construction machinery, agricultural machinery, and machinery and equipment.