| Aiming at some problems existing in the traditional reducer transmission system,combined with the existing research theories of internal gears and drum worms,a new type of transmission mechanism based on the drum worm and the variable internal gear is proposed in this paper.The transmission combines the advantages of the worm dr ive and type of three-in-one design,making the new transmission relatively small in size and light in weight,while also having the function of adjustable backlash and compensate for wear.In this paper,the research of structure and heat transfer is carr ied out from the perspective of theory and simulation.A series of researches and analysis are carried out around the mathematical modeling theory,3D modeling,power loss,thermal coupling and temperature field of the transmission mechanism.The main contents of this paper include the following aspects:Firstly,the working principle and machining theory of the two core parts,variable tooth internal gear and the drum worm in the new reducer transmission,are briefly introduced,and its’ structure is studied.The meshing principle of differential geometry and gear space is used as the theoretical basis for studying the new type of transmission,and the mathematical model of the new transmission mode is created by the kinematics method in the envelope method.Secondly,the derived meshing functions are brought into the Matlab software to analyze the meshing performance and parameter relationship of the drum worm.Then,in the Matlab software,the operation program of the tooth surface contact line is written,and the drum worm tooth surface contact line model is analyzed by the operation program.Combined with 3D modeling software,an accurate model is built for the new drive pair.Next,based on the basic theoretical knowledge of heat transfer theory,combined with the structural characteristics and working principle of the new transmission device,the thermal power loss of the whole device is studied,several main transmission heat sources are determined and theoretically studied,and the relevant calculation formulas are listed.The main propagation mode of the heat source and the propagation process of the device are studied.The heat transfer analysis of the main heat source in the device is carried out,and the convective heat transfer coefficient of the relevant components is calculated.Then,considering that in the working process of the whole gear,the internal gear and the drum worm are the core parts of the whole device,and it must be ensured that the transmission pair has good working conditions.Temperature is an important reason that affects its maximum stress.Therefore,the maximum equivalent stress variation of the new worm drive mode at different temperatures are studied in this paper.The relationship between stress and temperature is obtained by thermal coupling analysis using Ansys.The foundation for the design of the heat dissipation system of the new reducer transmission device and the study of the temperature field distribution of the device is laid.Finally,based on Creo software,an accurate 3D solid model of the new transmission is established.The highest temperature of the entire transmission is obtained at the meshing of the variable tooth thickness inner gear and the drum worm by using Ansys analysis software,and the temperature is 58.153℃.The temperature on the whole transmission pair is between 27.27℃ and 58.153℃,and the temperature on the bracket is between 30.196℃ and 54.954℃.The calculated data provides a reference for studying the follow-up work of the new reducer device. |
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