Intake system for rotary piston engine

Claim 1

A two rotor type rotary piston engine comprising: a casing comprised of a pair of rotor housings, each rotor housing having an inner wall of trochoidal configuration, an intermediate housing located between the rotor housings, and a pair of side housing secured to outer sides of the respective rotor housings to define rotor cavities in the respective rotor housings, a pair of substantially polygonal rotors disposed in the respective rotor cavities with apex portions in sliding engagement with the inner walls of the respective rotor housings to define working chambers of cyclically variable volumes, eccentric shaft means carrying said rotors so that said rotors are rotated with 180° phase difference in terms of angle of rotation of said eccentric shaft means, intake means including two individual intake port means provided in at least one of said intermediate and side housings to open to the respective rotor cavities and being cyclically closed by said rotors as the rotors rotate, intake passage means including throttle valve means, and two individual passage means leading respectively to said two individual intake port means, communicating passage means located downstream of said throttle valve means and communicating with said two individual passage means, said two individual intake port means having an opening period of 270° to 320° in terms of the angle of rotation of said eccentric shaft means, said communication passage means and said two individual passage means leading to the respective rotor cavities having an overall length between 0.57 to 1.37 m for transmitting a compression wave produced in one of said two individual passage means in opening timing of one of said two individual intake port means to the other of said two individual intake port means just before said other of said two individual intake port means is closed to obtain an additional intake charge in an engine speed range of 5000 to 7000 rpm.