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US 4,905,638 AGranted
Two stage carburetor
AssigneeBrunswick Corporation
InventorsMark D. Curtis, James L. Wagner
Life of this patent
Estimating the term…
Abstract
A two stage carburetor for introduction of an air-fuel mixture into the crankcase of a two-stroke marine engine includes a carburetor body that defines a pair of throttle bores, one of which has a reduced cross-sectional area. The throttle bores deliver an air-fuel mixture to separate and distinct reed blocks having comparable cross-sectional areas.
Claims8
A two stage carburetor for introduction of an air-fuel mixture into the crankcase of a two-stroke marine engine comprising:
- a carburetor body defining,
- a first throttle bore of first cross-sectional area and containing a pivoting throttle plate movable between an open position in which an air-fuel mixture is allowed to pass through said first throttle bore and a closed position in which the passage of the air-fuel mixture through said first throttle bore is prohibited, and
- a second throttle bore of second cross-sectional area greater than said first cross sectional area and containing a pivoting throttle plate movable between an open position in which an air-fuel mixture is allowed to pass through said second throttle bore and a closed position in which the passage of the air-fuel mixture is prohibited, a first reed block disposed downstream from
- said first throttle bore and having a cross-sectional area substantially equal to said first throttle bore cross-sectional area, said first reed block receiving the air-fuel mixture from said first throttle bore and introducing the mixture into the crankcase of an engine cylinder,
- a second reed block disposed downstream from said second throttle bore and having a cross-sectional area substantially equal to said second throttle bore cross-sectional area, said second reed block receiving the air-fuel mixture from said second throttle bore and introducing the mixture into the crankcase of said engine cylinder, and
- throttle plate control means for moving said throttle plates of said first and second throttle bores between said closed and open positions, said control means moving said first bore throttle plate to said open position prior to moving said second bore throttle plate from said closed position.
3 more elements
A two stage carburetor for introduction of an air-fuel mixture into the crankcase of a two-stroke marine engine comprising:
- a carburetor body defining,
- a first throttle bore of first cross-sectional area and containing a pivoting throttle plate movable between an open position in which an air-fuel mixture is allowed to pass through said first throttle bore and a closed position in which the passage of the air-fuel mixture through said first throttle bore is prohibited, and
- a second throttle bore of second cross-sectional area greater than said first cross sectional area and containing a pivoting throttle plate movable between an open position in which an air-fuel mixture is allowed to pass through said second throttle bore and a closed position in which the
- passage of the air-fuel mixture is prohibited,
- a first reed block disposed downstream from said first throttle bore and having a cross-sectional area substantially equal to said first throttle bore cross-sectional area, said first reed block receiving the air-fuel mixture from said first throttle bore and introducing the mixture into the crankcase of an engine cylinder,
- a second reed block disposed downstream from said second throttle bore and having a cross-sectional area substantially equal to said second throttle bore cross-sectional area, said second reed block receiving the air-fuel mixture from said second throttle bore and introducing the mixture into the crankcase of said engine cylinder,
- a third reed block downstream from said first throttle bore and having a cross-sectional area substantially equal to said first throttle bore cross-sectional area, said third reed block receiving the air-fuel mixture from said first throttle bore and introducing the mixture into the crankcase of a second engine cylinder,
- a fourth reed block downstream from said second throttle bore and having a cross-sectional area substantially equal to said second throttle bore cross-sectional area, said fourth reed block receiving the air-fuel mixture from said second throttle bore and introducing the mixture into the crankcase of a second engine cylinder,
- a first linkage disposed on one side of said carburetor body and operably connected to said throttle plate of said first bore to move said throttle plate between said closed and open positions,
- a second linkage disposed on the opposite side of said carburetor body and operably connected to said throttle plate of said second bore to move said throttle plate between said closed and open positions, and
- connecting means for operably joining said first and second linkages so that movement of said first linkage results in subsequent movement of said second linkage so that said throttle plate of said first throttle bore is moved to said open position prior to moving said second throttle bore plate from said closed position.
8 more elements
Dependencies are inferred from the claim text.