Power Flow And Efficiency Of A Closed Differential Planetary Gear Train

The closed differential planetary gear transmission transmits power through multiple channels,which has the advantages of high power and compact structure,and is widely used in high-power working conditions such as ships.Due to the complex internal structure of the closed differential planetary gear train and the multiple paths of power transmission,if the design structure is not reasonable,it will lead to the occurrence of closed power inside the gear train,reducing the efficiency and service life of the transmission device.A simple and effective method was used to derive the transmission ratio of a complex closed differential planetary gear train.The relationship between the unit transmission ratio and power distribution coefficient was calculated,and the system’s no power cycle condition was obtained.The power flow graph and efficiency curve have been drawn,which is a concise and effective method for selecting the transmission ratio of two-stage gear train units,effectively avoiding power cycles within the gear train and improving the transmission efficiency of the transmission system.This paper takes a closed differential planetary gear train as the research object,theoretically analyzes and calculates the power flow and transmission efficiency of the gear train,establishes a 3D model of the gear train in Solid Works,and uses ADAMS software to carry out dynamics and kinematics simulation to obtain the simulated transmission efficiency and the number of load sharing systems of the two-stage gear train.The calculation method of transmission efficiency is deduced and calculated by using the friction coefficient calculation model,and the influencing factors of the closed differential planetary gear train are analyzed respectively,including the influence of different input power,input speed,modulus,pressure angle,and the efficiency of the closed differential planetary gear train.By loading the closed differential gearbox and conducting load sharing performance tests,the load sharing characteristic curves of the closed stage and differential stage planetary gears are obtained.The transmission efficiency of the reducer was experimentally analyzed on a gearbox experimental platform composed of a closed differential planetary gearbox.The comparison between the test results under rated load and the simulation results obtained through software simulation analysis and theoretical analysis calculation was obtained,verifying the feasibility and reliability of the virtual prototype.