1. Transmission device
The slewing device of hydraulic excavator mainly includes slewing hydraulic motor, slewing driving pinion and fixed ring gear of slewing reducer. There are generally two options for the rotary transmission system of hydraulic excavator. The low-speed high torque motor is used as the driving device of the rotary mechanism, and the hydraulic motor can be directly connected with the rotary pinion without reducer. Using high-speed motor as rotary driving device and mechanical deceleration device in the middle, the scheme has low cost and high reliability, so it is widely used.
2. Slewing Support
The rotary support device of excavator bears axial force, overturning moment and radial force. The front part bears pressure and the rear part bears tension.
3. Central swivel
The position between the upper turntable and the lower chassis can be changed within 360 ° for the fully rotary hydraulic excavator. Therefore, there is a problem of power transmission for the walking hydraulic motor of crawler excavator and the hydraulic outrigger of tire excavator.
