Hydraulic motor Components of
Motor housing, shaft and roller bearings, plunger and return plate, plunger cylinder block and port plate, motor rear end cover.
The hydraulic motor is an actuating element of the hydraulic system, which converts the hydraulic pressure energy given by the hydraulic pump into the mechanical kinetic energy (torque and rotational speed) of its output shaft.
structural style
Vane type
Because of the pressure oil, the rotor has a torque due to the unbalanced pressure. 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. Its rotation speed is determined by the flow of the input hydraulic motor. Because the hydraulic motor usually needs to be able to rotate forward and backward, the blades of the vane type hydraulic motor should be placed radially. In order to better ensure that there is pressure oil at the blade root all the time, a one-way valve should be installed on the path between the return and pressure oil cavities and the blade root. In order to better ensure that the vane hydraulic motor can start normally after the pressure oil is connected, it is necessary to make the top of the blade contact closely with the inner surface of the stator to ensure better sealing. Therefore, a preload spring should be installed at the blade root. The vane type hydraulic motor is small in size, small in moment of inertia, sensitive in action, and suitable for occasions with high reversing frequency; However, the leakage is large and unstable at low speed. Therefore, the vane type hydraulic motor is usually used in situations where the rotation speed is high, the torque is small, and the action needs to be sensitive.
Radial plunger type
Radial plunger hydraulic motor
The basic working principle is that 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 outward and firmly supports the inner wall of the stator, because there is an eccentricity between the stator and the cylinder body. At the contact point between plunger and stator, the reaction force of stator to plunger is. The force can be divided into two components: and. 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 each other is X, the force will produce a torque on the cylinder block to make the cylinder block rotate. The cylinder block outputs the torque and rotation speed through the transmission shaft connected to the end face.
The specific situation of the torque of a plunger analyzed above, because there are many plungers acting in the oil pressure area, the torque of this kind of plunger will rotate the cylinder block and output the torque. Radial plunger hydraulic motor Used for low speed and high speed
Inner curve motor
In the specific case of torque.
1. Single acting connecting rod type radial piston motor
The 23Y connecting rod motor diagram, the shaft flow distribution hydraulic motor diagram, and the five corner radial motor assembly animation show the operating principle of the single acting connecting rod radial piston motor, and its appearance is like a five corner star. The motor is composed of housing 1, crankshaft 6, port shaft 5, connecting rod 3, plunger 2, eccentric wheel 4 and other parts.
Advantages: simple structure, reliable operation.
Disadvantages: large volume, heavy weight, torque pulsation, low speed and poor stability.
2. Multi action Internal curve plunger motor
The motor is composed of port shaft 1, cylinder block 2, plunger 3, cross beam 4, roller 5, stator 6 and output shaft 7. The displacement of this type of motor is twice that of single stroke motor. It is equivalent to having 21 plungers. Because the number of equivalent plungers increases, under the same working pressure, the output torque increases correspondingly and the torque pulsation rate decreases. Sometimes this type of motor is made into multi row plunger, the number of plunger is more, the output torque is further increased, and the torque pulsation rate is further reduced.
