Outboard drive exhaust system

Details Outboard drive exhaust system Outboard drive exhaust system

1995-11-22

1997-10-07

Avila, Stephen

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

B63H 2192

Patent

active

056740999

ABSTRACT:
An exhaust system for a marine outboard drive emits engine exhaust gases to the atmosphere at a point proximate to the water surface of the body of water in which the outboard drive is operated. An upper cowling of the outboard drive houses an engine. A drive shaft housing depends from the lower tray of the cowling and terminates at an intermediate housing. The intermediate housing connects a lower propulsion unit to the drive shaft housing. The exhaust system communicates with an exhaust manifold of the engine and extends downwardly through the drive shaft housing. An expansion chamber of the exhaust system is formed principally within the intermediate housing, below the drive shaft housing and above the propulsion device supported by the lower propulsion unit. An exhaust vent communicates with the expansion chamber and emits engine exhaust gases at a point behind the outboard drive near the lower end of the drive shaft housing.

REFERENCES:
patent: 3045423 (1962-07-01), Hulsebus
patent: 3552121 (1971-01-01), Kitagawa et al.
patent: 5100351 (1992-03-01), Shibata
patent: 5346417 (1994-09-01), Isogawa
patent: 5494467 (1996-02-01), Sohgawa et al.

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