Liugong Loader Parts 2
Working Principle Of Walking Motor Of Liugong Loader Parts
Many Liugong loader parts have different working principles. High-speed motor and planetary reducer or cycloid gear reducer are commonly used in walking motors, while the control of the loop of hydraulic motor has its characteristics.
The motor is equipped with high voltage automatic variable device. When the high-speed gear is hung up, the circuit connects the manual transmission oil inlet to drive the transmission valve to move left, so that the motor becomes small displacement. If driving resistance increases and the oil pressure rises to the set value, the oil pushes the transmission valve to the right and the motor automatically turns into a large displacement low-speed gear to increase torque. Therefore, this kind of motor can automatically shift gears with the change of walking resistance.
In addition, the control of the motor is mainly completed by the motor control valve, and the working principle is analyzed in combination with the structure schematic below.
Suppose oil enters from inlet A and the motor rotates, the operations of motor control valves are as follows:
1.Open the check valve and the hydraulic oil enters the right chamber of the motor.
2.The hydraulic oil enters the balance valve through the throttling hole and moves it to the left, connecting the brake oil circuit and releasing the brake. This action also connects the return oil circuit of motor port B.
3.The hydraulic oil enters the buffer piston chamber through the middle throttling hole of the safety valve and pushes the buffer piston to the left. If the system pressure exceeds the set pressure of the relief valve (10.2mpa) at this time, the safety valve will be opened instantly, acting as a buffer.
4.If the motor is overspeed (e.g., downhill) and the pump has no time to supply oil, the pressure of port A will be reduced. The balance valve moves to the right under the action of spring force and closes the return oil channel of the motor to limit the motor speed.
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