Stratified two-stroke engine

Abstract

Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included.

1 . A dual passage carburetor ( 9000 ) comprising:
 a main throttle body ( 401 );   a secondary throttle body ( 8901 );   at least one fuel orifice ( 411   b ) in the secondary throttle body ( 8901 );   an air only passage  8310  in the main throttle body ( 401 );   an air only valve  81   b;      a rich charge passage  8300 ;   a rich valve  994   b,  in which the air only valve  81   b  and rich valve  994   b  are inter connected through a linkage  9408 ;   a fuel metering chamber ( 317 );   at least one fuel passage ( 220   b ) connecting fuel metering chamber ( 317 ) to the at least one fuel orifice ( 411   b ) in the secondary throttle body ( 8901 );   a fuel inlet ( 620 ); and   at least one fuel orifice in the rich charge passage ( 8300 ).   
     
     
         2 . A stratified engine including:
 a housing;   a crankshaft  22 ;   an oil tank  140 ;   an intake port  84 ;   a simple manifold (heat dam)  904   c;      at least one air pipe  88  with at least one one-way valve  89  at the end of the air pipe  88 ;   the carburetor of  claim 1  embedded within the engine;   at least one transfer passage  11  having at least one transfer port  33 , in which the at least one transfer passage  11  is intermittently connected to ambient air through the at least one air pipe  88  and through the at least one one-way valve  89 ,   in which the at least one air pipe  88  connects the air only passage in carburetor  9000  to the top of transfer passage  11 .   
     
     
         3 . The engine of  claim 2  in which the carburetor delivers an air-fuel with oil mist for lubricating the engine. 
     
     
         4 . A stratified engine  360  having:
 a piston  2016 ; 
 a combustion chamber  30 ; 
 at least one intake port  84 ; 
 at least one exhaust port  50 ; 
 at least one transfer passage  11 ; 
 at least one transfer port  33 ; 
 a simple manifold (heat dam)  904   c;    
 a crankcase chamber  26 , in which the crankcase chamber  26  and combustion chamber  30  are intermittently connected to each other as the piston  2016  moves upward and downward; 
 a crankshaft  22  having a crank web  21 ; 
 a connecting rod  18 ; 
 a cylinder  2012 ; 
 a single air pipe  87 , in which the air pipe  87  diverges into at least two air pipes  89 ′ and  89 ″, one on each side of the cylinder  2012  and with at least one one-way valve at the end of each air pipe  89 ′ and  89 ″; and 
 a single exit air throttle body  8902 . 
 
     
     
         5 . The engine of  claim 2  further comprising:
 a crankcase chamber  26 ; 
 two transfer passages  11  intermittently connecting the crankcase chamber  26  to the combustion chamber  30 ; and 
 a U-shaped pipe with a first port at the base of the U for receiving gas from the carburetor, and second and third ports at the respective tips of the U, said second and third ports for delivering gas to the respective transfer passages  11 . 
 
     
     
         6 . The engine of  claim 5  in which the pipe is a single component.