Performance Analysis And Design Research On Swing Movable Teeth Transmission

As a novel planetary drive with small teeth difference which transmits two coaxial rotary motion, swing movable teeth transmission establish a place in planetary gear transmission with advantages such as novel structure, big transmission ratio, strong carrying capacity and high transmission efficiency. It has extensive application prospect in many industries. At present, theoretical study and practical application on swing movable teeth transmission is at infancy stage in our country. This paper carries on a series of in-depth and systemic theoretical study on engagement theory, kinematics, reliability theory, optimization design and manufacturing process.Based on the transmission structure and principle of swing movable teeth transmission, theoretical profile equation of central wheel is synthesized by methods of complex vector and coordinate transfer according to the engagement theory of swing movable teeth. Actual profile equation of central wheel is deduced and graph simulation is done. Angular velocity and acceleration variation curve of swing movable teeth are plotted and their variation rules are analyzed. Specific sliding of swing movable teeth is deduced and its variation curve is plotted. Curvature and radius of curvature of central wheel are solved and non end cutting conditions of actual profile of central wheel are deduced.Based on deformation compatibility condition, force analysis model of swing movable teeth transmission is established and arithmetic solution of contact force on movable teeth acted by other components is calculated. Transmission performance and minimum transmission angle position is analyzed by using of lower pair equivalent mechanism of swing movable teeth. Self-locking conditions of return stroke of swing movable teeth are deduced and methods to overcome self-locking are obtained. Contact strength of movable teeth and central wheel, movable teeth and shockwave generator, bending strength of output axis pin are deduced respectively according to failure type of swing movable teeth transmission and calculation instances are given.The strength fuzzy reliability of swing movable teeth transmission is researched. By using fuzzy theory and reliability design method to consider randomicity and fuzziness of design variables in mechanical transmissions, the reliability design of swing movable teeth transmission is more reasonable and objective. Fuzzy average equivalent dynamic load of arm bearing is calculated by using fuzzy mathematics method and fuzzy comprehensive evaluation. Fuzzy reliability life of arm bearing is calculated.Multi-objective optimized design of swing movable teeth reducer is executed. By considering product size of reducer, specific sliding of conjugate profiles and strength reliability, simultaneously constraint conditions, multi-objective optimized design of swing movable teeth reducer by application of grey clustering analysis method is executed. Structure parameter of prototype is determined according to most satisfaction solution obtained by optimization. Numerical control machining design of center wheel based on Pro/Engineer software is operated. Tooth flank milling of center wheel is implemented in NC milling machine.Based on LabVIEW software platform and corresponding hardware of NI company, with no-contact torque measurement technique,the torque detection is implemented through measuring the phase difference by correlation analysis algorithm. A set of automatic testing equipment adopting modularization software of swing movable teeth transmission is constructed to on-line test driving performance of swing movable teeth transmission at different operating modes. The testing result shows that the transmission has appropriate structure design and good driving performance. The testing system is of high precision and increases automatism level of original driving performance technology largely.