Patent ID: 7267327
Filing Date: 2007-09-11
Classification: F02M

Abstract:
1. A throttle valve assembly for a carburetor used with an internal combustion engine, comprising: a carburetor body having a fuel and air mixing passage and a valve chamber intersecting the fuel and air mixing passage and extending to a base of the valve chamber in the carburetor body; a valve body at least partially disposed in the valve chamber and having an end received generally adjacent the base of the valve chamber, and a through bore at least partially received in the mixing passage for rotation therein to control at least in part the air-fuel mixture flowing through the mixing passage; a fuel nozzle having an orifice communicating with the fuel and air mixing passage; a needle valve carried by the valve body and adjacent to the orifice to control the open area of the orifice; a cam follower received in the valve chamber adjacent the base and carried by the valve body; and a cam member constructed as a separate piece from the valve body and the carburetor body and being carried by the valve body for rotation in unison with the valve body and relative to the carburetor body, the cam member having at least one axially inclined cam surface engageable with the cam follower to move the valve body axially in response to rotational movement of said valve body about its axis to move the needle valve relative to the orifice.