Profile determination of planar and spatial cams with cylindrical roller-followers

摘要

A simple and useful procedure that can be used to determine profile surfaces of planar and spatial cams with cylindrical roller followers is presented. Based on the rigid-body transformation between the cam and the roller follower, the pitch(curve) surface which is the path of the point of the roller centre can be easily generated. Then the analytical profile surface of the cam can be represented by the offset surface of the pitch surface with a distance equal to the radius of the roller. To illustrate the ease and effectiveness of the approach, analytical expressions of profile surfaces of a disc cam, two cylindrical cams and two globoidal cams are typically given. Furthermore, in order to show the validity of this method, the results arethen compared to those derived by an earlier procedure based on the screw theory.