EPITROCHOIDAL SURFACE ENGAGING DEVICE

摘要

The present invention relates generally to improvements in devices for measuring or forming with a high degree of accuracy the contour of a surface defining the cavity of a rotary type combustion engine. The device disclosed herein is particularly designed for use with rotary combustion engines incorporating a rotor presenting three or four apices and having an internal gear which meshes with and orbits about a fixed sungear whose axis is on the central axis of the engine. The seal members at the tips of the rotor apices must maintain contact with the cylinder surface having an epitrochoidal contour. The device disclosed herein includes a rotatable base for horizontally supporting a cylinder block and means for imparting rotation to said base in a given direction about a vertical axis coincident with the center of the epitrochoidal surface defining the cavity of a supported cylinder block. A surface contacting element is shiftable in the opposite direction and novel control means serves to assure positioning of said element in accurate coincidence with said epitrochoidal surface during the rotation of the engine block.