Charge forming device with air bleed control valve
AssigneeWalbro Corporation
InventorThomas L. Schmidt
Life of this patent
Estimating the term…
Abstract
In at least some implementations, a charge forming device includes a body defining at least part of a first passage, a throttle valve movable relative to the first passage between an idle position and a wide open position, an air bleed passage communicated with the first passage, and a control valve. The control valve may be arranged in the air bleed passage to selectively inhibit or prevent air flow to the first passage from the air bleed passage. And the control valve is moveable between a first position and a second position in response to movement of the throttle valve wherein greater air flow is permitted from the air bleed passage to the first passage in the body when the control valve is in the second position than when the control valve is in the first position.
Claims18
A charge forming device, comprising:
- a body defining at least part of a first passage through which fuel or air or both flows for delivery to an engine;
- a throttle valve movable relative to the first passage between an idle position and a wide open position;
- an air bleed passage communicated with the first passage to provide a supply of air to the first passage;
- and
- a control valve arranged in the air bleed passage to selectively inhibit or prevent air flow to the first passage from the air bleed passage, the control valve being moveable between a first position and a second position in response to movement of the throttle valve wherein greater air flow is permitted from the air bleed passage to the first passage in the body when the control valve is in the second position than when the control valve is in the first position, and wherein the throttle valve includes or cooperates with a driving surface that, during at least a portion of the movement of the throttle valve between the idle position and the wide open position, causes displacement of the control valve.
A charge forming device, comprising:
- a body defining at least part of a first passage through which fuel or air or both flows for delivery to an engine;
- a throttle valve movable relative to the first passage between an idle position and a wide open position;
- an air bleed passage communicated with the first passage to provide a supply of air to the first passage;
- and
- a control valve arranged in the air bleed passage to selectively inhibit or prevent air flow to the first passage from the air bleed passage, the control valve being moveable between a first position and a second position in response to movement of the throttle valve wherein greater air flow is permitted from the air bleed passage to the first passage in the body when the control valve is in the second position than when the control valve is in the first position, wherein the control valve is driven by the throttle valve between its first and second positions, and which also includes a valve seat against which the control valve is engaged in the first position, and wherein the throttle valve includes a cam portion that has a distance from the valve seat that varies as the throttle valve is moved between the idle position and wide open position.
A charge forming device, comprising:
- a body defining at least part of a first passage through which fuel or air or both flows for delivery to an engine;
- a throttle valve movable relative to the first passage between an idle position and a wide open position;
- an air bleed passage communicated with the first passage to provide a supply of air to the first passage;
- and
- a control valve arranged in the air bleed passage to selectively inhibit or prevent air flow to the first passage from the air bleed passage, the control valve being moveable between a first position and a second position in response to movement of the throttle valve wherein greater air flow is permitted from the air bleed passage to the first passage in the body when the control valve is in the second position than when the control valve is in the first position, wherein the throttle valve is rotatable about an axis between the idle position and wide open position, and wherein the throttle valve includes a drive surface that is not circular relative to the axis and the drive surface causes movement of the control valve between the first and second positions as the throttle valve is rotated.
Dependencies are inferred from the claim text.