Hydraulic excavator is a kind of construction machinery with large consumption and high energy consumption. Its rotation time accounts for about 50% ~ 70% of the whole working cycle, and its energy consumption accounts for about 25% ~ 40%. The traditional hydraulic excavator builds up the braking torque through the buffer relief valve, which makes the upper mechanism stop braking gradually, Frequent turning action is bound to produce huge turning braking energy. Therefore, it is of great significance to study the driving structure of the new rotary mechanism for energy saving, improving production efficiency and reducing the impact of the working device. At home and abroad, the research on the rotary energy-saving drive system of hydraulic excavator is mainly based on the hybrid power system.
