Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1986-03-07
1987-06-16
Feinberg, Craig R.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65V, F02B 7502
Patent
active
046729259
ABSTRACT:
A two-cycle engine includes a port timing control device for varying a timing of the opening of an exhaust port by a piston. The port timing control means includes a first valve mounted within an exhaust passage adjacent to an upper end of the exhaust port and having a port timing control surface, a second valve mounted on a cylinder block between a cylinder head and the first valve and having a closure surface, and an urging member acting on the second valve to always urge it against the first valve. The first valve is operable to be angularly moved about an axis generally perpendicular to the axis of a cylinder into and out of an extended position where the control surface is disposed slightly below the upper end of the exhaust port to close a part of the exhaust port. The second valve is movable along a generally straight path into and out of an extended position where the closure surface closes that portion of the exhaust port lying between the upper end of the exhaust port and the first valve. The second valve is movable in synchronism with the angular movement of the first valve through the urging member.
REFERENCES:
patent: 4121552 (1978-10-01), Mithuo et al.
patent: 4285311 (1981-08-01), Ito
patent: 4321893 (1982-03-01), Yamamoto
patent: 4341188 (1982-07-01), Nerstrom
patent: 4364346 (1982-12-01), Shiohara
patent: 4368703 (1983-01-01), Shibata
patent: 4391234 (1983-07-01), Holzleitner
Iwashita Kanau
Miyata Takahide
Nakamichi Katsuhiro
Taniuchi Kazuman
Yamamoto Hitoshi
Feinberg Craig R.
Honda Giken Kogyo Kabushiki Kaisha
Okonsky David A.
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