Geometric design of roller gear cam reducers

A roller gear cam reducer, composed of a turret with rollers and a globoida l cam, is often used to provide high positioning precision at low cost. In this study, a simple procedure is given to generate the surface of the cam without solving any contacts equations. The method is based on rigid body t ransformations between the cam and the turret roller. Analyses of the press ure angle and the principal curvature of the surface geometry are also acco mplished. In addition, contact forces between the roller and cam, input tor que, and the reducer efficiency are evaluated. An example of the procedure is given.