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US 9,598,828 B2Granted
Snowthrower including power boost system
AssigneeBriggs & Stratton Corporation
InventorJason J. Raasch
Life of this patent
Estimating the term…
Abstract
A carburetor includes a passageway having a constricted section, a nozzle directed into the passageway proximate the constricted section, and a shaft having a surface that at least partially defines the constricted section. The nozzle is configured to deliver fuel to air passing through the passageway, and the surface includes a contour that is configured to be moved relative to the passageway to change the area of the passageway through the constricted section.
Claims20
A snow thrower having a power boost mode, the snow thrower comprising:
- a frame;
- wheels coupled to the frame;
- a fuel tank;
- an engine mounted to the frame, comprising:
- an air intake;
- a combustion chamber;
- a passageway configured to channel air from the air intake to the combustion chamber, wherein the passageway comprises a surface at least partially defining a constricted section of the passageway, and wherein the surface is configured to be adjusted to change the area of the passageway through the constricted section;
- a well configured to hold fuel delivered to the well from the fuel tank;
- and
- a nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section of the passageway, whereby the constricted section of the passageway provides a relative low pressure in air passing through the passageway that draws fuel from the nozzle to the air;
- a rotating tool driven by the engine;
- and
- a control interface, wherein manual control of the control interface increases the flow rate of air through the passageway to increase the combustion processes of the engine and provide a power boost mode having greater output for the engine.
10 more elements
A snow thrower comprising:
- a frame;
- wheels coupled to the frame;
- a fuel tank;
- an engine mounted to the frame, comprising:
- an air intake;
- a combustion chamber;
- a passageway configured to channel air from the air intake to the combustion chamber, wherein the passageway comprises a surface at least partially defining a constricted section of the passageway;
- a well configured to hold fuel delivered to the well from the fuel tank;
- and
- a nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section of the passageway, whereby the constricted section of the passageway provides a relative low pressure in air passing through the passageway that draws fuel from the nozzle to the air;
- a rotating tool driven by the engine;
- and
- a power boost system, wherein operation of the power boost system increases the combustion process in the engine and provides a power boost mode having a greater output for the engine.
10 more elements
A snow thrower comprising:
- a frame;
- wheels coupled to the frame;
- a fuel tank;
- an engine mounted to the frame, comprising:
- an air intake;
- a combustion chamber;
- a passageway configured to channel air from the air intake to the combustion chamber, wherein the passageway comprises a surface at least partially defining a constricted section of the passageway, and wherein the surface is configured to be adjusted to change the area of the passageway through the constricted section;
- a well configured to hold fuel delivered to the well from the tank;
- and
- a nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section of the passageway, whereby the constricted section of the passageway provides a relative low pressure in air passing through the passageway that draws fuel from the nozzle to the air;
- a rotating tool driven by the engine;
- and
- an automatic system, wherein the automatic system automatically adjusts the surface to change the area of the constricted section to increase the flow rate of air through the passageway to increase the combustion processes of the engine and provide a power boost mode having a greater output for the engine.
10 more elements
Dependencies are inferred from the claim text.