The working principle of the rotary motor is that the hydraulic oil of the oil pump enters into different oil passages to push different plungers, slippers, swash plates, etc. to realize left and right rotation. The safety valve (safety valve) in the rotary motor is installed on the top of the rotary motor. It limits the pressure of the rotary circuit within the set safety pressure range, and reduces the impact when the rotary motor starts or stops. The safety valve is a two-stage design. When the safety valve is opened, there is no excessive pressure, so when the rotating motor stops, there is almost no vibration load. The function of the slow check valve is to supplement the oil lost in the process of stopping the rotary action. In the process of stopping or decelerating rotation, due to the sudden disappearance and reduction of working hydraulic oil, the rotary motor is easy to produce vacuum. Therefore, the whole system needs to be specially designed to avoid the damage of vacuum to the motor. As the key component of hydraulic excavator, the performance and quality of rotary motor are directly related to the production efficiency of excavator. The choice of accessories is crucial.
