Patent ID: 8616179

Claim:
A rotary throttle valve carburetor comprising: a carburetor body housing having an air intake passage, said air intake passage extending through said carburetor body housing from one end through an opposite end; a cylindrical valve chamber located in said carburetor body housing transverse to said air intake passage; a rotary throttle valve body mounted in said cylindrical valve chamber, said rotary throttle valve body having a generally cylindrical tubular body including a central axis and further comprising: an arc-segment passage in the circumferential surface of said rotary throttle valve, said arc-segment passage selectively and progressively aligned with said air intake passage as the rotary throttle valve body is rotated and rotatable between idle and full open throttle positions to thereby regulate the flow of air and fuel through the carburetor; and means for converging the airflow through said air intake passage so as to create a venturi effect as air flows through said air intake passage; a first end cap press fit into one end of said cylindrical tubular body of said rotary throttle valve body, said first end cap having a radially tapered end face extending into said air intake passage; a second end cap press fit into an opposite end of said cylindrical tubular body of said rotary throttle valve body, said second end cap having a radially tapered end face extending into said air intake passage complimentary said radially tapered end face of said first bearing end cap to define a venturi in said air intake passage whereby air entering said air intake passage will be accelerated by the venturi effect of said converging means; means for supplying fuel to said carburetor body housing; and means for delivering fuel from said fuel supply means to said air intake passage; whereby fuel delivered from said fuel supply means is fully atomized by the air flowing through said air intake passage and accelerated by the venturi effect of said converging means and thereafter exits said air intake passage.