Accurate Realization of Follower Motions in High-Speed Cam-Follower Mechanisms

摘要

Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, allrncam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite thernpresence of a flywheel) which causes distorted follower motions and subsequent dynamical problems. The authorsrnpreviously proposed two methods to overcome these problems: (i) the synthesis of inertially compensatedrncams [2], of which the motion law is adapted to the camshaft speed fluctuation and (ii) input torque balancingrnusing an inverted cam mechanism [3]. The present paper unifies the notation and dimensionless analysis of thernprevious papers and compares both methods by applying them to the same design example. Furthermore, thernanalysis in the presence of friction is enhanced. Both methods are shown to yield accurately realized followerrnmotions, even in the presence of a considerable amount of friction, despite the fact that friction is ignoredrnduring the design process.