Research On Hydro-mechanical Continuously Variable Transmission Based On Differential Planet Gear Trains

Tractors,cranes,loaders,heavy equipment transporters and its like widely used in the field of engineering,play a greatly significant role in engineering construction and economic development.However,with the issue of global energy and environment protection becoming increasingly serious,the appearance of Hydro-mechanical Continuously Variable Transmission provides a new idea to solve the problem for people who are in trouble.It is universally acknowledged that CVT is the core component of the vehicle transmission which is a very significant part in the transmission system of vehicle and directly affects its performance in power and economy.This paper introduced a hydro-mechanical continuously variable transmission based on differential planet gear trains.Its advantages like high carrying capacity,high efficiency and stepless speed regulating smoothly in the broad range,make it very suitable in the use of engineering vehicles.The paper described the classification of CVT,the advantages and disadvantages of CVT,and the great meaning used in engineering vehicles.In addition,this paper presented the principle and characteristics of CVT,which provided theoretical support for the design of hydro-mechanical CVT and the application in theengineering vehicle.Based on theoretical analysis,the three-dimensional model was established on soliderworks software platform and the simulation analysis about the efficiency and speed of the engine,the speed of the vehicle,the yaw angle of the variable pump and the efficiency of the hydro-mechanical continuously variable transmission was carried out on the ADAMS and SIMULINK software platform.The simulation results show that the carrying capacity and efficiency of this hydro-mechanical CVT are quite high and its performance in power and economy is excellent.Undoubtedly,it is very suitable to use this CVT in engineering vehicles.What's more,this paper established the reliability modeling of planetary gear transmission and analyzed the important factors which influenced the reliability.Finally,Genetic algorithm was used to optimize the parameters of hydro-mechanical continuously variable transmission as well.Though the analysis of this paper,we can easily conclude three results.Firstly,compared with other traditional continuously variable transmissions,the performance in power and economy of hydro-mechanical CVT presented in this paper is better.Secondly,parameter optimization design can significantly reduce the weight of CVT and improve its reliability,making its characteristics more prominent.Finally,the reasonable matching of dynamic parameters,combined with the use of the hydro-mechanical CVT,can make the engine and CVT maintain high efficiency when the demand in the power of the engineering vehicle is satisfied,which can really help human beings achieve the dream ofenergy conservation and environment protection.