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US 2006/0219217 A1Published application
Stratified scavenging carburetor
AssigneeWalbro Engine Management, L.L.C.
InventorsPaul Dow, David Hacker
Life of this patent
Estimating the term…
Abstract
In one presently preferred embodiment a stratified scavenging carburetor has a scavenging air passage with an air control valve and a fuel and air mixing passage with a throttle control valve, and a lost motion coupling associated with the valves to delay opening of the closed air valve until the throttle valve has partially opened from its idle position to an off idle position and preferably thereafter to open the air valve in phased relationship with the throttle valve so that the valves become wide open at substantially the same time. Preferably the coupling has reels associated with the valve and connected by a flexible cord.
Claims26
A carburetor, including:
- a scavenging air passage and a fuel and air mixing passage;
- a throttle valve disposed in communication with the fuel and air mixing passage and movable between an idle position at least substantially restricting fluid flow through the fuel and air mixing passage and an open position permitting an at least somewhat less restricted fluid flow therethrough;
- an air valve disposed in communication with the scavenging air passage and movable between closed and open positions to control air flow through the scavenging air passage;
- a lost motion coupler operably associated with the valves, movable over a limited range relative to the air valve, and movable with the air valve outside of the limited range;
- and
- a flexible cord operably connecting the throttle valve and air valve through the lost motion coupler to drive the opening of the air valve in response to movement of the throttle valve toward its open position, wherein the air valve is closed when the throttle valve is in its idle position, when the throttle valve is moved a limited amount away from its idle position toward a partially open off idle position the cord drives the lost motion coupler and in said limited range the air valve remains closed, and further movement of the throttle valve away from its off idle position drives the lost motion coupler which moves the air valve from its closed position toward its open position.
3 more elements
A carburetor, including:
- a scavenging air passage and a fuel and air mixing passage;
- a throttle valve disposed in communication with the fuel and air mixing passage and movable between an idle position at least substantially restricting fluid flow through the fuel and air mixing passage and an open position permitting an at least somewhat less restricted fluid flow therethrough;
- an air valve disposed in communication with the scavenging air passage and movable between closed and open positions to control air flow through the scavenging air passage;
- a lost motion coupler operably associated with the valves, movable over a limited range relative to the air valve, causing movement of the air valve when moved outside of the limited range, and including a flexible cord that operably connects the air valve and throttle valve and causes rotation of the air valve when the throttle valve is rotated sufficiently to move the lost motion coupler outside of said limited range so that the air valve is closed when the throttle valve is in its idle position, when the throttle valve is moved a limited amount away from its idle position toward a partially open off idle position the cord drives the lost motion coupler and in said limited range the air valve remains closed, and further movement of the throttle valve away from its off idle position drives the lost motion coupler which moves the air valve from its closed position toward its open position.
1 more element
A carburetor comprising:
- a scavenging air passage;
- an air valve disposed in the scavenging air passage and rotatable between closed and open positions to control air flow through the scavenging air passage;
- a fuel-and-air mixing passage;
- a throttle valve in the fuel-and-air mixing passage and rotatable between an idle position at least substantially restricting fluid flow through the fuel-and-air mixing passage, and a wide open position permitting less restricted fluid flow through the fuel-and-air mixing passages;
- and
- a lost motion coupler having a flexible cord operably connected adjacent one end with the throttle valve and operably connected adjacent the other end with the air valve and configured so that the cord is slack when the air valve is in its closed position and simultaneously the throttle valve is in its idle position and as the throttle valve is rotated away from its idle position to a partially open off-idle position, the slack in the cord is taken up while the air valve still remains in its closed position and as the throttle valve is rotated from its partially open off-idle position to its wide open position, the cord is placed in tension and rotates the air valve from its closed position to its open position.
3 more elements
Dependencies are inferred from the claim text.