Internal combustion engine

An internal combustion engine comprising:

• a main combustion chamber;
• an auxiliary combustion chamber having an orifice through which said auxiliary combustion chamber communicates with said main combustion chamber;
• a suction port means in communication with said main combustion chamber for introducing a lean mixture thereto, said suction port being so constructed in association with said main combustion chamber that said port causes said lean mixture to swirl in said main combustion chamber in such a manner that the center of the swirling of said lean mixture is formed in the vicinity of said orifice;
• and
• a suction passage means located within said suction port means for introducing a rich mixture into said main combustion chamber and toward said center of said swirling, whereby a rich mixture zone is formed in the vicinity of said orifice and a lean mixture zone is formed around said rich mixture zone;
• whereby at least a portion of said rich mixture is introduced through said orifice into said auxiliary combustion chamber during a compression stroke of said internal combustion engine.

An internal combustion engine comprising:

• a cylinder;
• a cylinder head;
• a piston disposed within said cylinder;
• a main combustion chamber defined by said cylinder, said cylinder head and said piston;
• an auxiliary combustion chamber having an orifice through which said auxiliary combustion chamber communicates with said main combustion chamber, said orifice being disposed in the vicinity of the central axis of said cylinder;
• a suction port means in communication with said main combustion chamber for introducing a lean mixture thereto, said suction port being so disposed in association with said main combustion chamber that said port causes said lean mixture to swirl around said central axis of said cylinder;
• a suction valve disposed in said suction port;
• a suction passage means located within said suction port means having an open end thereof directed to the vicinity of the central axis of said cylinder for introducing a rich mixture into said main combustion chamber, toward said center of said swirling, whereby a rich mixture zone is formed in the vicinity of said orifice and a lean mixture zone is formed around said rich mixture zone;
• whereby at least a portion of said rich mixture is introduced through said orifice into said auxiliary combustion chamber during a compression stroke of said internal combustion engine.

An internal combustion engine comprising:

• a cylinder;
• a cylinder head;
• a piston disposed within said cylinder;
• a main combustion chamber defined by said cylinder, said cylinder head and said piston;
• an auxiliary combustion chamber having an orifice in communication with said main combustion chamber, said orifice being disposed in the vicinity of the central axis of said cylinder;
• a suction port means in communication with said main combustion chamber for introducing a lean mixture thereto;
• a suction valve disposed in said suction port and having a valve head provided with a shroud thereon for causing said lean mixture to swirl around the central axis of said cylinder;
• a suction passage means located within said suction port means having an open end thereof directed to the vicinity of the central axis of said cylinder for introducing a rich mixture into said main combustion chamber, toward said center of said swirling, whereby a rich mixture zone is formed in the vicinity of said orifice and a lean mixture zone is formed around said rich mixture zone;
• whereby at least a portion of said rich mixture is introduced through said orifice into said auxiliary combustion chamber during a compression stroke of said internal combustion engine.