Structural Design And Performance Research Of Cam Double-Shock Type Roller Live Tooth Reducer

In this paper,a cam double-shock type roller live tooth reducer is studied.By deriving the equation of the center wheel tooth profile,the effect of different parameters on the center wheel tooth profile is analyzed by using Matlab software.The meshing characteristics such as continuous transmission conditions,overlap and sliding of the live roller teeth and the center wheel are studied.A virtual prototype model is established using Solid Works software,and the kinematic and dynamics simulation software Adams is used to verify the transmission ratio,output angular velocity and position variation of the cam double-shock type roller live tooth reducer.Manufacturing and assembly are performed by machining the created virtual prototype model.The performance test platform of cam double-shock type roller live tooth reducer is established,and the overall performance test is carried out.It provides a new idea and theoretical basis for the design of movable tooth transmission reducer,which is of great significance and engineering practical value to the development of reducer.Combining with the basic theory of movable tooth transmission,the structural composition and transmission principle of cam double-shock wave roller movable tooth transmission are analyzed in detail,the main structural composition of roller movable tooth transmission is determined,the meshing model of the center wheel is established,and the center wheel is deduced.The effects of eccentricity,transmission ratio and radius of the exciter on the profile of the central wheel teeth are analyzed while keeping other parameters constant.The top of each tooth becomes progressively sharper as the eccentric distance increases,the root part of the tooth gradually extends outward,and the depth of the entire central wheel tooth groove becomes larger,and the excessive eccentric distance causes the tooth groove connection to become sharper.As the transmission ratio increases,the tooth groove width gradually decreases,and when the transmission ratio decreases,the tooth profile becomes smoother and smoother.As the radius of the exciter increases,the tooth profile of the center wheel increases equidistantly,the top of each tooth slot becomes smoother,the joint of each tooth slot becomes progressively sharper,and the radius of curvature gradually increases.The structure is verified to be free of root cuts and interference by curvature changes.Based on the geometric model of the meshing state,the continuous drive condition and the overlap of the structure are verified by solving the example.The kinematic principle is used to establish the sliding model of roller live tooth,and the effect of different parameters changes on the sliding rate and slip-roll ratio is carried out using Matlab software.The absolute values of center wheel sliding rate and live tooth sliding rate as well as slip-roll ratio decrease and then increase with the increase of live tooth angle.The rate of change of the sliding rate and slip-roll ratio is greatest at the point of engagement and least at the top of the tooth.As the radius and eccentricity of the exciter increase,the sliding rate of the central wheel increases and the sliding rate and sliding ratio of the live tooth decrease.The radius of the roller live tooth increases,and the peak value of the sliding rate of the movable tooth increases by about 10.3% for every 1mm increase.No matter how the eccentric distance changes at the meshing point,the sliding rate and slip-roll ratio remain the same.However,after the meshing point,the greater the eccentricity,the greater the change rate of slip rate and slip-roll ratio.The design of the components is carried out according to the structural principle and design requirements of the cam double-shock type roller live tooth reducer,and the 3D modeling is carried out by Solid Works,and the assembly of the virtual prototype is completed.The kinematic simulation analysis is performed by Adams software,and the output angular velocity of single-shock and double-shock type roller live tooth drive system is compared.The results show that the double-shock roller live tooth drive system can solve the problem of sudden change of starting speed,and the drive process has no big shock.The analysis is carried out by analyzing the angle of the rotation and movement of the added roller tooth,and the analysis results show that the simulation results are consistent with the theoretical calculation.Simulation of the output angular velocity at different speeds is also carried out,and the results show that the double-shock roller live tooth reducer at high speed has high transmission efficiency and more stable transmission.A prototype of the double-shock wave roller movable gear reducer was developed,building the experimental platform,and testing the vibration and temperature of the prototype,the experimental results show that the vibration amplitude is mainly at the doubling and doubling frequencies of the engagement frequency,and the temperature is up to 59.5℃,and the overall motion process performance is good.