Internal-combustion engines – Rotary – With charge treatment means
Patent
1983-11-28
1986-01-28
Koczo, Michael
Internal-combustion engines
Rotary
With charge treatment means
123242, F02B 5304
Patent
active
045664129
ABSTRACT:
A two rotor type rotary piston engine includes an intake system comprised of individual intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and adapted to be cyclically closed by the rotors as the rotor rotate, an intake passage including a throttle valve and individual passages leading respectively to the intake ports and communicated with each other by communicating passages downstream of the throttle valve. The intake port includes a main port having an opening period of 230.degree. to 290.degree. in terms of angle of rotation of the eccentric shaft and an auxiliary port having an opening period of 270.degree. to 320.degree. in terms of the angle of rotation of the eccentric shaft. The auxiliary port is normally closed but opened in heavy load operation by a control valve and has a closing timing later than that of the main port. The communication passages and the individual passages leading to the respective rotor cavities have overall length between 0.57 and 1.37 m so that a compression wave produced in one individual passage in opening timing of one intake port is transmitted to the other intake port just before the other intake port is closed to obtain an additional charge under engine speed ranges of 3000 to 4500 rpm and 5000 to 7000 rpm.
REFERENCES:
patent: 3491733 (1970-01-01), Souhis
patent: 4020800 (1977-05-01), Ishikawa
patent: 4425883 (1984-01-01), Tadokoro et al.
Okimoto Haruo
Shiraishi Hideo
Tadokoro Tomoo
Koczo Michael
Mazda Motor Corporation
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