Automatic oil-fuel mixer with auxiliary chamber

Details Automatic oil-fuel mixer with auxiliary chamber Automatic oil-fuel mixer with auxiliary chamber

1988-07-12

1989-04-18

Okonsky, David A.

Internal-combustion engines

Two-cycle

Rear compression

184 65, 417395, F04B 4306

Patent

active

048216887

ABSTRACT:
A marine propulsion system (200) having an outboard two cycle internal combustion engine (212) has a modified oil-fuel mixer (2, 602) preventing excess oil in the mixture as fuel runs out. The modified mixer includes an auxiliary chamber (602) having a fuel inlet (604) receiving fuel from the working chamber (22) of the mixer below a given level, a vapor inlet (606) receiving fuel vapor or air from the working chamber above the given level, and a vapor outlet (608) exhausting the vapor. When the fuel tank (5) runs dry, air is drawn through a transfer passage (38) in the mixer to one side of the moveable diaphragm (24), and fuel pump (11) suction is applied to both sides of the diaphragm to halt movement thereof and stop further pumping of oil from the oil tank (7) to the engine. The invention also enchances accuracy of the oil-fuel mixture ration during normal operation.

REFERENCES:
patent: 3924975 (1975-12-01), Hundertmark
patent: 4473340 (1984-09-01), Walsworth
patent: 4551076 (1985-11-01), Dubois
patent: 4583500 (1986-04-01), Hundertmark

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