Throttle body with fluid flow control
AssigneeWalbro Corporation
InventorsGary J. Burns, William E. Galka, Bradley J. Roche, Albert L. Sayers, David L. Speirs
Life of this patent
Estimating the term…
Abstract
A throttle body may have a main bore for supplying a fuel and air mixture to an engine. A throttle valve head may be received in the main bore and movable between idle and wide open positions to control fluid flow through the main bore. A main fuel outlet and a boost venturi may open to the main bore and a flow directing feature may alter the velocity and/or direction of fluid flow in the main bore relative to the fuel outlet or boost venturi. The flow directing feature may be carried by the body, the throttle valve head, or the boost venturi.
Claims18
A throttle body, comprising:
- a body having a main bore from which a fuel and air mixture is discharged for use by an engine;
- a throttle valve shaft carried by the body for rotation relative to the body,
- a throttle valve head carried by the throttle valve shaft and moveable between an idle position and an open position to control at least some fluid flow through the main bore;
- and
- a boost venturi open to the main bore;
- wherein the throttle valve head includes a non-planar portion that defines a flow directing feature to alter at least one of the velocity or direction of at least a portion of the fluid that flows in the main bore and relative to the boost venturi, wherein the main bore has an axis, and the boost venturi has an axis that is radially offset from the axis of the main bore, wherein the flow directing feature is oriented to increase air flow through the boost venturi when the throttle valve head is in the open position, wherein the boost venturi includes a projection that extends upstream of an inlet of the boost venturi and wherein the projection is arranged to direct air into the inlet of the boost venturi.
A throttle body, comprising:
- a body having a main bore from which a fuel and air mixture is discharged for use by an engine and a fuel passage leading to the main bore to provide fuel into the main bore;
- a throttle valve head carried by the body and moveable between an idle position and a wide open position to control at least some fluid flow through the main bore;
- a boost venturi supported in the main bore at least in part by a flange of the boost venturi that is engaged with the body, the boost venturi having an inlet open to the main bore at a location downstream of the throttle valve head, an outlet open to the main bore and a passage extending between the inlet and the outlet;
- and
- a flow directing feature associated with the throttle valve head to alter at least one of the velocity or direction of at least a portion of the fluid that flows in the main bore and relative to the inlet of the boost venturi, and the fuel passage opens into the passage of the boost venturi so that fuel from the fuel passage is mixed with air flowing through the passage of the boost venturi and then discharged from the outlet into the main bore for mixing with air in the main bore, wherein the fuel passage is defined partially by a rod extending between the body and the boost venturi, and the rod is separate from the flange and also supports the boost venturi within the main bore, wherein the boost venturi directly engages a surface of the body that defines the main bore.
Dependencies are inferred from the claim text.