Carburetor for stratified internal combustion engine

In a torch ignition internal combustion engine comprising:

• a cylinder;
• a piston;
• a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber;
• a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture;
• an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith;
• a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture;
• a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake vavle is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber;
• and
• a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto;
• a carburetor comprising:
• means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage;
• fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage;
• partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second pipe having a rich air-fuel mixture receiving orifice and a longitudinal axis proximate said orifice substantially aligned with the direction of flow of said air-fuel mixture in said air passage;
• and
• a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.

In a torch ignition internal combustion engine comprising:

• a cylinder;
• a piston;
• a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber;
• a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture;
• an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith;
• a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture;
• a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake valve is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber;
• and
• a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto;
• a carburetor comprising:
• means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction portion and suction passage;
• fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage;
• partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-section substantially perpendicular to the flow of said air-fuel mixture in said air passage;
• and
• a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.

In a stratified charge internal combustion engine comprising:

• a cylinder;
• a piston;
• a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber;
• a spark plug having a set of electrodes exposed to said combustion chamber;
• a suction port means operatively in communication with said combustion chamber for introducing a lean air-fuel mixture thereto;
• an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith;
• and
• a suction passage means having an open end thereof disposed within said suction port in the vicinity of said valve head for introducing a rich air-fuel mixture into said combustion chamber around said set of electrodes of said spark plug,
• a carburetor comprising:
• means defining an air passage connected to one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage;
• fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage;
• partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage;
• and
• a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and the richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.

In a torch ignition internal combustion engine comprising:

• a cylinder;
• a piston;
• a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a main combustion chamber;
• a suction port operatively in communication with said main combustion chamber adapted to receive a lean air-fuel mixture;
• an auxiliary combustion chamber means disposed in said main combustion chamber for producing and spurting a torch flame into said main combustion chamber;
• and
• a suction passage means operatively in communication with said auxiliary combustion chamber for introducing a rich air-fuel mixture thereto,
• a carburetor comprising:
• means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere, to said suction port and suction passage;
• fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage;
• partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage;
• and
• a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.