Rotary throttle valve carburetor

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.

A rotary throttle valve carburetor comprising:

• a carburetor body housing having:
• an air intake passage extending through said carburetor body housing from one end to an opposite end;
• a cylindrical valve chamber located in said carburetor housing traversing said air intake passage;
• an annular rotary throttle valve body having one end;
• an opposite end;
• and an arc-segment passage in the circumferential surface of said annular rotary throttle valve body, said arc-segment passage selectively and progressively aligned with said air intake passage as said annular rotary throttle valve body is rotated and rotatable between idle and full open throttle positions to thereby regulate the flow of air through said air intake passage;
• first bearing means mounted to said one end of said annular rotary throttle valve body;
• second bearing means mounted to said opposite end of said annular rotary throttle valve body;
• each of said first and second bearing means further comprising means for converging the airflow through said air intake passage so as to collectively define a venturi along said air intake passage;
• means for mounting said first and second bearing means respectively between said annular rotary throttle valve body and said carburetor body housing such that said annular rotary throttle valve body is rotatable between idle and full open throttle positions with limited frictional drag on said annular rotary throttle valve tubular body;
• a fuel bowl attached to said carburetor body housing;
• means for delivering fuel from said fuel bowl to said air intake passage, whereby fuel delivered from said fuel bowl to said air intake passage 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.