A main carburetor body has generally cylindrical bores into which are precisely and removably fitted liners. The inner liner surfaces are contoured as a venturi wherein a circular inlet section narrows down to a throat after which the outlet section gradually expands in flow area. Fuel discharges into the venturi through a plurality of ports in the venturi wall, these ports being located around the periphery of the venturi and generally in the vicinity of the venturi throat. Booster venturis, which in conventional carburetors obstruct the flow path, are not used. The carburetor is readily modified by removing the liners and installing a new set of liners which may have different dimensions for the venturi and a different port pattern for fuel inlet to the venturi.
Venturi sleeves (24, 26, 28 and 30) are telescopically moved upwardly into the bores (14, 16, 18 and 20) of the carburetor body (12) until the annular shoulder (46) of each sleeve abuts a corresponding shoulder (36) of each bore. Booster venturis (74, 76, 78 and 80) are suspended coaxially with respect to the venturi sleeves (24-30) with the support conduit (86) extending through a notch (52) at the first edge of the venturi sleeve. Positioning cords (50) are formed in the lower outer cylindrical surface (44) of each venturi sleeve (24), so that the positioning cords (50) must face and abut each other when the venturi sleeves are properly inserted into the bores of the carburetor body, thus assuring that the sleeves are properly oriented in the carburetor body. Flow director surfaces (104, 106, 108 and 110) in the carburetor bowl (102) guide the air toward the venturi sleeves.
A carburetor throttle valve actuation assembly for a combustion engine is readily adapted for use as a remote control actuator, a local control throttle actuator, or both together providing an optional choice for the end user. The carburetor has a throttle valve having a shaft journaled to a body for movement about a rotation axis. A slave lever connects rigidly to a distal end of the shaft projecting outward from the body. A connection spaced radially outward from the axis engages the slave lever to a radially projecting swivel member of a local, manually operated, throttle valve actuation assembly. The swivel member rotates in unison with the slave lever about the axis, is spaced axially outward from the shaft and is journaled to a bracket engaged rigidly to the body. Preferably, the connection has a hole in the slave lever. If the remote throttle control actuator is used, a Bowden wire engages to a pin projecting axially outward from the slave lever at the hole. If the local throttle control actuator is used either a cylindrical void carried by the swivel member mates to the pin, or a peg projecting outward from the swivel member and toward the body is inserted into the hole forming the connection that permits axial movement of the slave lever with respect to the swivel member.
A mixer for a gas fueled engine uses a venturi through which a fuel nozzle opens into an air inlet path at a narrowest portion of the venturi in a substantially parallel orientation relative to the flow of inlet air in the air inlet path to reduce the mixture loss, and an air nozzle opens into the air inlet path at an expanding portion of the venturi in a substantially parallel orientation relative to the flow of the inlet air to reduce the ventilation resistance caused by a boundary layer and to make a uniform mixture of the gaseous fuel and the air.
Interchangeable venturi sleeves are removably positioned in open-ended bores of a carburetor center section. Each of the sleeves is colored a particular color corresponding to the physical parameters of the sleeve, for example, inner diameter and shape. Similarly, base plates and metering blocks of different capacities are provided such that the operating parameters of the carburetor can be changed. Like the venturi sleeves, the base plates and metering blocks are color-coded to indicate their physical parameters. With this color-coding, the observer can quickly and easily determine the physical characteristics of the carburetor.
A throttle apparatus having a throttle body with an air passageway extending therethrough, an axle rotatably mounted in the throttle body, a disk affixed centrally to the axle so as to pivot relative to a rotation of the axle, and a channel formed in a wall of the throttle body and having an end separate from and adjacent to the disk. The channel is formed on the wall in at least one side of the disk. The axle is adapted to rotate in relation to a movement of an accelerator pedal. The axle extends across the air passageway transverse to a longitudinal axis of the passageway. The disk is movable between a first position adapted to block air flow through the passageway and a variable second position adapted to allow air flow through the passageway. A seat is formed in the passageway of the throttle body and extends radially inwardly from the wall. The seat extends circumferentially around the disk in the first position. The channel can include a plurality of channels which are formed in the wall of the air passageway.
