Study On Meshing Characteristic And Dynamic Performance Of Globoidal Cam Continuous Transmission Mechanism With Balls

Continuous transmission mechanism of globoidal cam with balls is a new type transmission mechanism with rolling balls instead of sliding balls. Ball is regarded as the third member in this mechanism that has advantages of less abrasion, high efficiency, reducing impact, and so on. As a new type mechanism, its bearing capacity and dynamical performance are the key factors for structure design. Therefore, it is significant to study the meshing characteristic of the mechanism and its dynamic performance by establishing its mechanics equations and flexible shaft five-degree-freedom dynamic model during its motion. The study provides theoretical basis for design, manufacturing and experimental study of continuous transmission mechanism of globoidal cam with ball.On the base of establishing 3D model of continuous transmission mechanism of globoidal cam with balls, the meshing characteristic of the mechanism and its dynamic performance are studied by applying contact mechanics, load distribution theory of Stribeck. The main work of the paper is as follows.First, structure design of continuous transmission mechanism of globoidal cam with balls:profile equation and meshing equation of double-circular arc raceway are deduced by the space meshing theory, on the base of which 3D model is established by Pro/E. Finally, the influences of structural parameters on the pressure angle are investigated.Second, the meshing characteristic and the influences of structural parameters on cam is studied based on the theory of Hertz. Load distribution model of ball seat is established by using load distribution theory of Stribeck for reference and the meshing characteristic between balls and the ball seat are investigated.Third, on the conditions of considering the cam shaft and indexing plate shaft as flexible shafts, the system is simplified as a flexible shaft five-degree-freedom dynamic model by employing the energy method. Dynamic equations are solved by using Runge-Kutta method, which provides us several dynamic response curves for analyzing.Forth, based on virtual prototype technology, mechanics and motion law of continuous transmission mechanism of globoidal cam with balls are acquired by performing kinetics simulation using ADAMS, which verified the results of theoretical analysis.Through the research above, the study on meshing characteristic and dynamic performance of globoidal continuous indexing cam mechanism with balls is accomplished. And it provides an important theoretic basis for the manufacturing and experimental study of continuous transmission mechanism of globoidal cam with balls.