Induction and exhaust apparatus for piston machines

Claim 1

In combination with a cylinder of a four-stroke piston engine, the cylinder having a reciprocating working piston defining a working chamber therewith and a drive shaft connected to the piston: a device for sequentially controlling an intake, compression, power and exhaust stroke of the piston, the device comprising a. a first and a second rotary valve means, each of the valve means including 1. a housing with an epitrochoidal shaped cavity having ports and 2. a triangularly shaped rotor supported in said cavity or epitrochoidal movement, the rotor having three surfaces defining respective chambers with the housing, 3. the ports in the housing of the first rotary valve means including an intake and an exhaust port, the ports in the housing of the second rotary valve means including an exhaust port, and an additional one of the ports in each of the housings serving for connection of one of the chambers to the working chamber of the cylinder, b. duct means connecting the additional ports to the working chamber, and c. synchronizing means connecting the drive shaft and the rotors for synchronizing the rotation of the drive shaft with that of the rotors, the synchronizing means including 1. reduction gearing causing the rotors to move so that, for each complete stroke, the one chamber in the housings is in communication with the working chamber of the cylinder through the duct means, the intake and the exhaust ports in the housing of the first valve means are selectively in and out of communication with the one chamber, the exhaust port in the housing of the second valve means is selectively in and out of communication with the one chamber, and such a surface of the rotors is exposed to gases coming from the working chamber of the cylinder during the power stroke that the gases contribute to the rotary movement of the rotors.