An epitrochoid is a roulette traced by a point attached to a circle of radius r rolling around the outside of a fixed circle of radius R, where the point is a distance d from the center of the exterior circle.
The parametric equations for an epitrochoid are
The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids.
THE STUDY OF THE AVERAGE TORQUE OF THE HYDRAULIC MOTOR WITH RADIAL PISTONS AND CAM WITH EPITROCHOIDAL PROFILE
Jan 01, 2008; Abstract: The hydraulic motors with internal cam and radial pistons are studied. Considering that the internal cam profile is an...