Design Characteristics of Constant Diameter Cam : Contribution to Brunell's Paper

K. Brunell has disussed the basic properties and the design characteristics of the constant diameter cam, especially of the cam whose base curve is given as cycloidal displacement function. However it seems that his discussion is questionable in some points, so in this paper, correcting or supplementing his paper, the properties and the design characteristics of the constant diameter cam will be made clear. Let lift h, dwell angle β and cam base curve ν (θ) : 0gθgβ for follower's rise motion be given, then the cam base curve is given by [numerical formula] Let g be radius of the cam base circle, then the governing criterion is to be such a g that satisfies the following conditions for each θ such that 0gθgβ. g+v (θ)+v" (θ)>0, g+h-v (θ)-v" (θ)>0. If the condition v (θ)+v (β-θ)=h : 0gθgβ holds, the governing criterion becomes g+v (θ)+v" (θ)>0 : 0gθgβ. Moreover we studied the constant diameter cam with cycloidal motion follower and we could express its governing criterion graphically.