Discharge arrangement for the exhaust gas from the work areas of a rotary piston combustion engine

Claim 1

A tcombustion engine of the circularly rotating piston type having an internally placed axle comprising a housing having at least a pair of side members and a central member placed between said side members, an eccentric shaft means, a piston means mounted for rotation on said eccentric shaft means with bearing points therebetween, said piston means having a front surface including exhaust gas openings that are in opposition to one of said side members and outlet channels that have a substantially uniform cross-section and are in fluid communication with said exhaust gas openings, said piston means being further defined by a profile including 2 N lobes defined by an epitrochoid curve, said central member comprising an inner profile having 2 N + 1 counter lobes forming an outer envelope curve for said piston means, gas outlet control opening means provided in the circumferential surface of N lobes of said piston means and in fluid communication with said outlet channels in said piston means, an annular exhaust gas guide means provided in one of said side members and cooperating with said outlet channels, said gas outlet control opening means and said exhaust gas openings in said piston means for leading away said exhaust gas from said operating spaces and said piston means, sealing means in said side members comprising a first outer sealing means for sealing the operating spaces between the piston means and the contour of said central member of said housing and, second radial inner sealing means for sealing the bearing points of said piston means on said eccentric shaft means, means for lubricating said bearing points, said exhaust openings formed on one said side portions of the piston means lying in a region defined by an envelope curve generated during rotation of said piston means by the inner contour of said first radial outer sealing strip means as projected on said piston means and by the outer contour of said second radial inner sealing strip means, said exhaust openings having a triangular shape, said exhaust gas guide means provided in said one side member of said housing running substantially circumferentially and permanently communicating with said exhaust openings to prevent the formation of stagnant exhaust gas pockets in said exhaust gas openings.