Engine for outboard motor

Details Engine for outboard motor Engine for outboard motor

1998-07-07

2000-05-30

Yuen, Henry C.

Internal-combustion engines

Lubricators

Crankcase, pressure control

123196W, 184 65, B63H 2000

Patent

active

060679514

ABSTRACT:
An improved and simplified outboard motor construction wherein the cooling and exhaust systems for the engine are formed with a minimum number of components and sealing joints. The exhaust system includes an elongated expansion chamber formed in the drive shaft housing. In addition, the drive shaft housing has a cylindrical section that is journaled within a swivel bracket for its steering movement. The volume between the external portion of the drive shaft housing and the internal portion of the swivel bracket forms a second expansion chamber that is employed for the low speed above the water exhaust gas discharge. The flow of cooling the water to and from the engine is controlled so that the exhaust gas interchange area between the power head and the drive shaft housing will be well cooled, as will the oil reservoir for the engine and the oil returned to it.

REFERENCES:
patent: 4474146 (1984-10-01), Shimizu et al.
patent: 4545332 (1985-10-01), Suzuki et al.
patent: 4790273 (1988-12-01), Oguri et al.
patent: 4969434 (1990-11-01), Nakgawa
patent: 5163394 (1992-11-01), Koishikawa et al.
patent: 5213074 (1993-05-01), Imagawa et al.
patent: 5687686 (1997-11-01), Takahashi
patent: 5860403 (1999-01-01), Hirano et al.

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