Two-cycle engine

Details Two-cycle engine Two-cycle engine

1998-03-31

1999-11-23

McMahon, Marguerite

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

F02B 2500

Patent

active

059881224

ABSTRACT:
To provide a structure for attaching exhaust control valves near exhaust ports in a two-cycle engine, the exhaust control valves variably controlling open areas of the exhaust ports. The cavity for receiving the exhaust control valves is formed near the upper edges of the exhaust ports on the cylinder block. The holder member is interposed between the cylinder block and the exhaust manifold, is attached to the pivot for supporting the exhaust control valves. A flange is provided for connection with the cylinder block. Therefore, the exhaust control valves are disposed near the upper edges of the exhaust ports. It is not necessary to form bearings on the cylinder block using a complicated process. Complicated parts such as bearings are collectively formed on the holder member that is independent and compact and easily machined. The pivot extends across the exhaust passages that are formed downwardly in order to detour around the pivot. A jet-propelled boat is provided with a saddle seat in which the power unit is neatly and compactly arranged in a limited space.

REFERENCES:
patent: 5373816 (1994-12-01), Asai et al.
patent: 5507263 (1996-04-01), Yamazaki et al.
patent: 5697332 (1997-12-01), Asai et al.
patent: 5709177 (1998-01-01), Worth et al.
patent: 5829394 (1998-11-01), Oike et al.
patent: 5839408 (1998-11-01), Oike et al.

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