Exhaust structure for small watercraft

Details Exhaust structure for small watercraft Exhaust structure for small watercraft

2008-05-06

2008-05-06

Olson, Lars A. (Department: 3617)

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

C440S08900C, C440S08900C

Reexamination Certificate

active

07367857

ABSTRACT:
To provide an exhaust structure for a small watercraft that can cool exhaust gas, reduce the size and weight, and thereby cost of a backflow prevention chamber. An exhaust structure for a small watercraft is configured to be able to cool exhaust gas in the course of leading it to the outside when the exhaust gas of an engine is led to the outside for discharge. This exhaust structure includes a water muffler containing water therein. A backflow prevention chamber is disposed above the water muffler and adapted to prevent water from entering the side of the engine from the side of the water muffler. The backflow prevention chamber is provided with a cooling water injecting portion adapted to spray cooling water to the exhaust gas in an internal space. An outlet is formed in the bottom portion of the backflow prevention chamber to communicate with the water muffler.

REFERENCES:
patent: 5740670 (1998-04-01), Woods
patent: 6035633 (2000-03-01), Woods
patent: 6120335 (2000-09-01), Nakase et al.
patent: 6769944 (2004-08-01), Miura
patent: 6913499 (2005-07-01), Matsuda
patent: 2003-176719 (2003-06-01), None

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