Power Analysis and Efficiency Calculation of the Complex and Closed Planetary Gears Transmission

2K-H planetary gears transmission power diagram is drawn by analyzing the kinematic, torque and power balance of the basic gear transmission, the corresponding relationship between typical 2K-H planetary gears transmission diagram and power diagram and power balance. Combining one specific example, the power distributions of the complex and closed planetary gears transmission are analyzed and its overall transmission efficiencies is calculated under considering power losses or not. The results show that the graphical representation is a simple, intuitive and practical method for power analysis and efficiency calculation, it can provide theoretical references for design work of the complex and closed planetary gears transmission.