Rotary piston engine exhaust gas recycling means

A rotary piston engine comprising a casing which includes a peripheral wall having an epitrochiodal inner surface and a pair of side walls secured to the opposite sides of the peripheral wall to define therein a cavity, a three-lobed rotor which rotates eccentrically in the cavity and has apex portions in sliding contact with the epitrochiodal inner surface for simultaneously defining intake, compression, combustion, expansion and exhaust chambers between the epitrochiodal inner surface and flanks of the rotor, first intake port means provided in the casing and directed into said intake chamber toward the leading, with respect to the direction of rotation of said rotor, portion of the intake chamber, first intake passage means connected to the first intake port means for supplying a combustion charge to the intake chamber, second intake port means provided in the casing and communicated with the intake chamber, second intake passage means connected to the second intake port means, said first intake port means being provided in the peripheral wall of said casing and having a smaller opening than that of the second intake port means for tending to cause the combustion charge to be present in the leading portion of the intake chamber, throttle valve means provided in the second intake passage means and adapted to be opened under a high load operation of the engine, an exhaust system including exhaust port means provided in the casing and communicated with the exhaust chamber and exhaust passage means connected to the exhaust port means, first exhaust gas recycling passage means connecting the exhaust system to the first intake passage means for continuously supplying the recycled exhaust gas to the first intake passage means so that the recycled exhaust gas is obtained in said leading portion of the intake chamber in which the combustion charge tends to be present, and ignition means provided on the casing.