Roger T Gault

US Patent:

53098757, May 10, 1994

Filed:

Dec 24, 1992

Appl. No.:

7/996680

Inventors:

Roger T. Gault - Chilton WI

Assignee:

Tecumseh Products Company - Tecumseh MI

International Classification:

F02M 110

US Classification:

12317916

Abstract:

An internal combustion engine having a carburetor including a float bowl that is internally vented through a venting path that extends from the carburetor bore to the headspace above the fuel in the bowl. An external bowl vent passageway extends through the carburetor body to permit air communication between the atmosphere external of the carburetor and the headspace. A thermally actuated valve is secured to a sheet metal cowling on the engine. A flexible tube is secured from the external vent passageway to the valve. While the engine is cold, the valve is open to permit the float bowl to be externally vented to the atmosphere, thereby providing a relatively rich fuel mixture which aids in starting the engine. Upon sustained engine operation and the attainment of a predetermined temperature, the valve closes the external vent passageway, thereby causing the float bowl to be internally vented only, thereby leaning out the fuel/air mixture to a desired emissions level during engine operation.

US Patent:

42540640, Mar 3, 1981

Filed:

Aug 2, 1979

Appl. No.:

6/062974

Inventors:

Lawrence J. Bernauer - Kohler WI
Roger T. Gault - Wild Rose WI

Assignee:

Kohler Co. - Kohler WI

International Classification:

F02M 508

US Classification:

261 64E

Abstract:

A starting mixture control for a carburetor that controls the richness of the fuel mixture being fed to an associated engine after initial starting, the carburetor having a throat for supplying air to the engine that is equipped with a choke valve upstream from a venturi constriction, a throttle valve downstream from the venturi constriction, a fuel bowl with a fuel nozzle opening into the throat at the venturi constriction, a bowl vent passage for providing atmospheric pressure to the fuel bowl during normal engine operation, and a pressure transmitting by-pass duct communicating between the bowl vent passage and the carburetor throat. When the engine is cranked with the choke closed a rich fuel mixture is delivered to the engine, and when the engine starts the duct transmits the low pressure on the downstream side of the choke valve to the fuel bowl to reduce the flow of fuel from the fuel nozzle to lean out the fuel mixture delivered to the engine to prevent stalling until the choke valve is adjusted to an open position.