Temperature adjusting automatic choke system
AssigneeHomelite, Inc.
InventorsChristopher L. Watson, John A. Morrow
Life of this patent
Estimating the term…
Abstract
An air inlet control system for a carburetor of an internal combustion engine. The system includes a magnet, an air inlet valve, and a temperature controlled limiter. The magnet is used to automatically attract the air inlet valve towards a fully closed position. The temperature controlled limiter limits the range of movement of the air inlet valve based upon the temperature of the engine. The limiter limits the open position of the valve to a position less than fully open when the engine is cold and, limits the closed position of the valve to a position less than fully closed when the engine is hot.
Claims23
An air inlet control system for an internal combustion engine, the system comprising:
- an air inlet valve;
- and
- a temperature controlled limiter, the limiter being adapted to limit a range of movement of the inlet valve based upon temperature of a cylinder of the engine, the limiter comprising a temperature responsive element for positioning at the cylinder and a mechanical linkage from the temperature responsive element to the air inlet valve, wherein a portion of the limiter is suitably sized and shaped to be positioned between cooling fins on the cylinder.
An air inlet control system for an internal combustion engine, the system comprising:
- an air inlet valve having a first end adapted to substantially close an air inlet aperture and a second end with a limiter receiving area;
- and
- a temperature responsive limiter with a lever, a spring, a connector and a tie member, the lever having a first end located in the limiter receiving area, the tie member being connected to the lever and having an end for positioning at a predetermined portion of the engine, the tie member being comprised of a temperature responsive material with an elongate straight shape adapted to longitudinally contract when heated and expand back to its normal size when cooled, wherein the connector and spring are between the lever and the tie member with the spring biasing the connector in a first direction.
An internal combustion engine having a cylinder, a spark plug, a carburetor, and an air inlet control system for the carburetor, the control system comprising:
- a magnet;
- an air inlet valve movable between a fully open position and a fully closed position, the valve having a first ferromagnetic section adapted to be attracted by magnetic pull of the magnet when the valve is proximate its fully closed position, and a second section with a limiter receiving area;
- and
- a limiter having a limit member with a first end located in the limiter receiving area, the limit member being movable between a first position and a second position, the first position limits movement of the valve to include an open position that is less than the fully open position and, the second position limits movement of the valve towards the fully closed position.
An air inlet control system for an internal combustion engine, the system comprising:
- an air inlet valve;
- and
- a limiter adapted to limit movement of the air inlet valve based upon temperature of a cylinder of the engine, the limiter including a limit member adapted to contact the air inlet valve and a tie member connected to the limit member, the tie member is comprised of a shape memory alloy with a portion extending between cooling fins on the cylinder.
An air inlet control system for an internal combustion engine, the system comprising:
- an air inlet valve;
- and
- a temperature controlled limiter, the limiter being adapted to limit a range of movement of the inlet valve based upon temperature of a cylinder area of the engine, the limiter comprising a magnet, a temperature responsive element, and a mechanical linkage from the temperature responsive element to the air inlet valve, at least a portion of the valve being comprised of ferromagnetic material and being pivotably connected to a frame with a fully closed position adjacent the magnet.
Dependencies are inferred from the claim text.