The features of kinematic calculation for Wankel’s rotary piston engine

Abstract

It is presented the design features and the principle of operation for Wankel’s rotary piston engine (RPD). It is given the analysis of scientific research aimed at improving the design of RPD. It is proposed the design study technique that allows in a graphical way to realize the construction of an RPD cylinder with a circular shape, the surface of which is made according to the epitrochoid. The derivation of equations is justified that allows to determine the coordinates of the position of the points of the epitrochoid depending on the eccentricity, the values of the radii of the initial generatrix of the epitrochoid, gear and fixed gear. It is given the calculation definition of the required value of the compression ratio. Using the Mathcad system as an example, it is shown the possibility of application mathematical software packages for calculations related to the study of the features of the Wankel’s RPD epitrochoid, its calculation, its research and its construction.

Keywords

• rotary piston engine
• epitrochoid
• gear wheel
• rolled gear
• eccentric
• mathcad