ANALYSIS AND COMPARISON OF EPICYCLOIDAL AND HYPOCYCLOIDAL INTERNAL-COMBUSTION ENGINE MECHANISMS

The analysis and comparison of epicycloidal and hypocycloidal mechanis ms for the rotary four-stroke internal combustion engine are presented . The mathematical modeling for velocity and acceleration analyses of rotary pistons, based on the continuity of contact between the bar and the pin on the planetary gear, is developed. Expressions for the comp ression ratio and the transmission angle of cycloidal engine mechanism s are also derived. Two cycloidal engine mechanisms, one epicycloidal and the other hypocycloidal, with the same gear ratio and range of fly wheel angle for the four-stroke cycle are analyzed and compared. The detailed kinematic analysis results identify the similarities and diff erences of these two cycloidal engine mechanisms. Several interesting features are observed and discussed.