Rotary type carburetor for stratefied scavenging engine

Abstract

An improved rotary type carburetor for a stratified scavenging engine designed to enable the easy adjustment of air and fuel flow at the time of initial configuration is disclosed. The improved rotary carburetor includes an air intake passage and an air-fuel mixture passage formed in a horizontal direction on a carburetor main body. The throttle valve of the improved rotary carburetor can be fitted into a cylindrical-throttle-valve hole formed orthogonal to a fuel and an air passage of the carburetor main body. The throttle valve has the air supply side valve hole formed on the air intake passage side and a fuel supply side valve hole formed on the air-fuel mixture passage side.

1 . A rotary type carburetor for a stratified scavenging engine comprising:
 an air intake passage and an air-fuel mixture passage formed in a horizontal direction on a carburetor main body; and   a throttle valve fitted into a bottomed cylindrical throttle valve hole formed orthogonal and perpendicular to a passage of the carburetor main body, wherein the throttle valve has an air supply side valve hole formed on the air intake passage side, a fuel supply side valve hole formed on the air-fuel mixture passage side, a groove pocket formed on an opening edge on an upstream end that is on a side of an accelerating rotation direction of the fuel supply side valve, and an opening shape on a downstream side of an opening end on at least the throttle valve side of the air-fuel mixture passage is formed on a perpendicular side parallel to an axis of the throttle valve.   
     
     
         2 . The rotary type carburetor of  claim 1 , further comprising:
 a cross-sectional shape of the air intake passage formed on the carburetor main body is an upper semicircle;   a cross-sectional shape of the air-fuel mixture passage is a lower semicircle, making a circle separated by a partition wall;   a cross-sectional shape of the air supply side valve hole formed on the throttle valve is an upper semicircle; and   a cross-sectional shape of the fuel supply side valve hole side is a lower semicircle, making a circle separated by a partition wall.   
     
     
         3 . The rotary type carburetor for a stratified scavenging engine of  claim 1 , wherein the groove pocket comprises a tongue-shaped opening end having parallel opposing sides. 
     
     
         4 . The rotary type carburetor for a stratified scavenging engine of  claim 3 , wherein the opening shape of the opening end of the throttle valve side has a shaped such that the opening shape has a constant area of exposure to the air-fuel mixture passage. 
     
     
         5 . A rotary type carburetor comprising:
 a cylindrical throttle valve hole formed orthogonal and perpendicular to a passage of the carburetor main body;   a throttle valve rotationally fitted into the cylindrical throttle valve hole, the throttle valve comprises:
 an air supply side valve hole formed on the air intake passage side, 
 a fuel supply side valve hole formed on the air-fuel mixture passage side, 
 a groove pocket formed on an opening edge on an upstream end of the fuel supply side valve, wherein the upstream end comprises a side toward a direction of accelerating rotation; and 
 an opening shape on a downstream side disposed on a perpendicular side parallel to an axis of the throttle valve. 
   
     
     
         6 . The rotary type carburetor of  claim 5 , wherein the air intake passage formed on the carburetor main body comprises a cross-sectional shape of a first semicircle;
 wherein the air-fuel mixture passage formed on the carburetor main body comprises a cross-sectional shape of a second semicircle, wherein the air intake passage is above the air-fuel mixture passage, and wherein the air intake passage and the air-fuel mixture passage are separate by a partition wall;   wherein the air supply side valve hole formed on the throttle valve comprise a cross-sectional shape of a third semicircle; and   wherein the fuel supply side valve hole side comprise a cross-sectional shape of a fourth semicircle, wherein the third semicircle is above the fourth semicircle and is separated by a second partition wall.   
     
     
         7 . The rotary type carburetor of  claim 5 , wherein the groove pocket comprises a tongue-shaped opening end having parallel opposing sides. 
     
     
         8 . The rotary type carburetor of  claim 5 , wherein the opening shape of the opening end of the throttle valve side has a length such that a portion formed by the parallel opposing sides of the groove pocket formed on the opening edge on the upstream end on the accelerating rotation direction side of the fuel supply side valve hole of the throttle valve does not extend further into the air-fuel mixture passage.