Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1994-01-07
1994-12-20
Okonsky, David A.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123323, F02B 7502
Patent
active
053738160
ABSTRACT:
An exhaust control device for a two-cycle engine which does not impart a change of a shape of an exhaust passage. An exhaust control device is provided in an exhaust port opening to an inner peripheral surface of a cylinder hole of a two-cycle engine wherein a cylinder wall portion adjacent to the exhaust port is formed with a rotational face obtained by rotating an arc having substantially the same curvature as the inner peripheral surface of the cylinder hole about a rotational axis C.sub.1 extending at a right angle to an axis C of the cylinder hole in the outside of the cylinder hole and a recess defined by both ends at a right angle to the rotational axis C.sub.1 and in communication with the exhaust port. Within the recess is mounted an exhaust: passage member having an exhaust passage in communication with the exhaust port and having an external shape substantially similar to the recess with a predetermined clearance formed relative to the recess in a portion above at least an upper edge of the exhaust port of the rotational face portion and the both end portions. A valve body is provided which comprises arm portions respectively inserted into the clearance in the both end portions and supported for swinging about the rotational axis C.sub.1 and a control face portion provided by connecting ends of the arm portions together and movable in and out of the clearance in the rotational face portion in response to the swinging of the arm portions.
REFERENCES:
patent: 4938178 (1990-07-01), Schlunke et al.
patent: 4993373 (1991-02-01), Klomp et al.
patent: 5063887 (1991-11-01), Ozawa et al.
Asai Masahiro
Ishibashi Yoici
Isomura Shinichi
Kudou Osamu
Honda Giken Kogyo Kabushiki Kaisha
Okonsky David A.
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