Asymmetric Tooth Profile Design And Drive Performance Analysis Of Two Tooth Difference Swing Rod Movable Teeth Drive

The push-stroke curve and return-stroke curve of the wave exciter of the conventional two tooth difference swing rod movable teeth drive are generally symmetrical curves,so it has good dynamic balance performance,which is in line with the development trend of reducer towards high stability,therefore,it has a good application prospect in the field of mechanical drive,and because of the symmetry of the push-stroke curve and return-stroke curve,it has the application of two-way drive.However,in practical applications,the drive devices in some special working situations only need to transmit one-way power or motion,once the devices direction of such devices devices is reversed,it will lead to self-locking of the mechanism.If the push-stroke curve and return-stroke curve of the wave exciter can be redesigned according to this particularity,the application scope of the swing rod movable tooth drive will be further expanded.In this paper,a new design method of asymmetric tooth profile curve is proposed,and the change of drive performance before and after the design of the new tooth profile curve is studied.Based on the symmetrical tooth profile of the conventional two tooth difference swing rod movable teeth drive,the motion law of the asymmetric follower was constructed by introducing the tooth profile asymmetry coefficient p.The tooth profile equations of the wave exciter and the central gear were derived by using the analytic geometry method,and an example calculation was given.Combined with the tooth profile equation of central gear,the pressure angle formula was established.The influence of tooth profile asymmetry coefficient p on the characteristics of asymmetric tooth profile was studied.According to the self-locking principle of the rotational pair,the self-locking conditions of the movable teeth of the pendulum rod in the asymmetric tooth reverse drive were analyzed.Based on the elastic small deformation theory,elastic deformation hypothesis and Hertz contact theory,the force model of the pendulum movable tooth meshing pair was established,and the contact stress of the pendulum movable tooth meshing pair was calculated;the force model of pendulum movable tooth meshing pair considering friction was established,and the meshing efficiency of pendulum movable tooth drive was solved.UG modeling software was used to establish the virtual prototypes of two tooth differential pendulum gear reducer with symmetrical tooth shape and asymmetrical tooth shape respectively,kinematics simulation and statics simulation of the two virtual prototypes were carried out by using Adams and ANSYS Workbench,the changes of output speed and equivalent stress and strain of meshing pair after asymmetric tooth shape design were analyzed,so as to analyze the influence of asymmetric tooth shape design on drive stability and bearing capacity of the system.According to the structural parameters of the virtual prototype,the processing drawings were drawn and the entity prototype was processed and assembled,the test experiment of the entity prototype was carried out by the movable tooth transmission test platform,the simulation data of the virtual prototype and the experimental data of the entity prototype were compared and analyzed,so as to verify the accuracy of theoretical calculation and simulation analysis and prove the structural advantages of asymmetric tooth shape design.The above research results provide a theoretical reference for the asymmetric tooth profile design of the two tooth difference swing rod movable teeth drive,and lay a research foundation for the related research on the influence of asymmetric tooth profile design on its transmission performance.