Exhaust gas recycle system for a rotary piston internal combustion engine

Claim 1

In a rotary piston internal combustion engine having a casing including two laterally spaced parallel end walls interconnected by a generally annular center wall, a rotary piston having circumferentially spaced apices which form a plurality of working chambers within said casing and perform intake, compression, explosion-expansion and exhaust processes as the piston planetarily rotates, an intake passage on one side of said generally annular center wall for introducing a fuel-air mixture and an exhaust passage on the same side and spaced therefrom for expelling an exhaust gas, the improvement comprising: a conduit extending within said casing and between said exhaust passage and said intake passage for recycling the exhaust gas, said conduit being surrounded by coolant passages, and a control valve carried by said conduit intermediate of said conduit connections to said intake and exhaust passages and being in close heat transfer position with respect to said coolant passages surrounding said conduit carrying the same.