Research Of A Type Of Contiuously Variable Transmission Based On Differential Gear Train And Hydro-viscous Clutch

Liquid viscous speed regulation technology has been developed and mature,and widely used in fan,pump and other load energy saving speed regulation,but in order to match with the load power,the direct use of liquid viscous clutch speed regulation often huge volume,and complex structure,reliability is not high.In order to expand the scope of use,there are products combining parallel shaft reduction drive with liquid-viscous speed regulation,but the structure is not compact enough.Planetary gear has the characteristics of small mass,small volume,compact structure and large carrying capacity,etc.Some studies put forward that the two methods should be combined in the energy saving speedregulation of rotary machinery such as pump and compressor.However,due to the addition of shunt coupling device,the transmission structure is relatively complex and limited by the power shunt ratio.In addition,there is also the adventof multi-stage hydraulic speed regulating device.The speed regulating element can be a hydraulic torque converter or a hydraulic viscous clutch.This device isoften used in the stepless transmission of engineering vehicles.The liquid-viscous speed regulating device based on the single-stage planetary differential gear train has been successfully applied to the soft start and speed regulating of the belt conveyor and other high-power equipment in theunderground coal mine.Its power can reach 3000 KW,but there are few products that can be applied to the load of fans and pumps.In this paper,a new type of speed regulating device is designed by combining the single-stage planetary gear and the hydro-viscous clutch,and the driving modes of the inner gear ring input,the sun wheel speed regulating and the planetary frame output are determined.The 3d structure is designed with the help of Solid Works software.After reaching the predetermined speed regulating range,the structure design is more compact than the same type of governor.With the help of the finite element analysis software,the free modal analysis of some key parts is carried out to provide theoretical basis for the structural optimization design.The speed,torque and power of 2K-H differential gear train are analyzed.The governing principle and design process of the hydro-viscous governor to be used in the scheme are introduced in detail,the governor parameters are determined,and the stability of the speed and torque regulation of the hydro-viscous clutch is verified by means of Adams dynamics simulation software.With the help of AMEsim and matlab/simulink,the joint simulation of the speed regulation system was carried out.In AMEsim,the non-standard servo valve and the whole physical model were mainly designed using the hydraulic component design library.Aiming at the nonlinear problem of hydro-viscous clutch,a method of combining fuzzy controller with PID controller is presented to design the control system.The final simulation results show that the system speed regulation under the fuzzy PID control is more stable,the adjustment time and steady-state error are reduced by 25% and 67% respectively compared with the ordinary PID,which can well meet the requirements of load speed regulation.Simulation of the nature of the tree trunk model to optimize the root;Based on the improved particle swarm optimization(pso)algorithm,the multi-objective optimization design of planetary gear mechanism is carried out.Under the condition of satisfying the bearing capacity of gear,the differential system hassmaller volume and center distance,and shows better transmission efficiency.