Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1991-10-16
1993-06-22
Wolfe, Willis R.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 65V, F02B 7502, F02B 2706
Patent
active
052208907
ABSTRACT:
A variable compression ratio mechanism for a two cycle diesel engine embodying auxiliary exhaust passages and auxiliary exhaust ports that communicate with the cylinder above the main exhaust ports and in which control valves are positioned for controlling the opening and closing of the auxiliary exhaust ports to change the effective compression ratio of the engine to minimize dead space between exhaust control valves and the auxiliary exhaust ports, the exhaust control valves are positioned in close proximity to the cylinder and comprise valve elements that operate in bores that are disposed substantially parallel to the cylinder bore. Both rotary and reciprocating type valves are disclosed and various mechanisms are disclosed for interlinking the control valves for simultaneous operation. In addition, the positioning of the auxiliary exhaust passages permits the formation of a cooling jacket between them that cools not only the auxiliary exhaust passages but also the control valves and the main exhaust passage. Embodiments are shown of adapting these principals to multiple cylinder engines and in which the main exhaust passages are formed in an acute angle to a plane containing the axes of the cylinder bores so as to permit a compact construction.
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Pat. Abstracts of Japan-vol. 12, No. 289 (M728) Aug. 8, 1988, JP-A-60 249,615 Oct. 12, 1985.
Pat. Abstracts of Japan-vol. 10, No. 122 (M476) (2179) Jul. 5, 1986 and JP-A-60 249 615 Oct. 12, 1985 (U.S. equivalent cited).
Beutler Ernest A.
Wolfe Willis R.
Yamaha Hatsudoki Kabushiki Kaisha
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