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US 8,910,616 B2Granted
Carburetor system for outdoor power equipment
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.
Claims12
An engine, comprising:
- a fuel tank;
- a well configured to hold fuel delivered from the fuel tank;
- 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 nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section, 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 vent configured to connect the well with outside air;
- and
- a variable restrictor configured to limit the connection provided by the vent between the well and outside air, wherein the degree of restriction provided by the variable restrictor is a function of the area of the constricted section of the passageway.
6 more elements
Outdoor power equipment, 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;
- 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;
- a control interface configured to allow an operator to adjust the surface at least partially defining the constricted section of the passageway when the engine is in a wide-open throttle configuration, thereby changing the area of the passageway through the constricted section.
8 more elements
Outdoor power equipment, 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;
- 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;
- a control interface configured to allow an operator to adjust the surface at least partially defining the constricted section of the passageway when the engine is in a wide-open throttle configuration, thereby changing the area of the passageway through the constricted section;
- and
- a locking system, wherein when the engine is not in the wide-open throttle configuration the control interface is locked by the locking system, preventing the operator from being able to adjust the surface.
10 more elements
Dependencies are inferred from the claim text.