Patent ID: 6827337
Filing Date: 2004-12-07
Classification: F02M

Abstract:
A rotary throttle valve carburetor having a body defining a fuel-and-air mixing passage and a cylindrical valve chamber, the fuel-and-air mixing passage communicating through the body, the valve chamber extended downward from a top surface of the body communicating transversely through the mixing passage, a rotary throttle fitted rotatably and axially movable into the valve chamber, the rotary throttle having a throttle hole and a throttle shaft, the throttle hole adjustably aligning to the fuel-and-air mixing passage, the throttle shaft projected upward from the valve chamber through the top surface of the body, a throttle lever engaged to and disposed transversely of the throttle shaft, the throttle lever having a downward facing cam surface, a fuel nozzle in communication with said throttle hole and a fuel metering chamber disposed on the bottom wall of the carburetor body, and a needle supported on said rotary throttle is fitted in said fuel nozzle to regulate an opening degree of a nozzle hole, the rotary throttle valve carburetor comprising:a lid plate engaged to the top surface of the carburetor body, the lid plate having a base portion and an annular shoulder, the base portion having a hole centered above the valve chamber, the throttle shaft projecting upward through the hole of the base portion, the annular shoulder projecting upward from the base portion and disposed concentrically to and spaced radially outward from the hole of the base portion; a circular seal disposed radially between the annular shoulder of the lid plate and the throttle shaft; a bracket, the base portion of the lid plate juxtaposed between the carburetor body and the bracket, the bracket disposed radially outward from the annular shoulder of the lid plate, the bracket having a cam follower engaged operatively to the downward facing cam surface of the throttle lever; and a plurality of spacers juxtaposed between the carburetor body and the bracket and bearing on the bracket to axially locate the bracket relative to the carburetor body.