Abstract An internal combustion engine having a cylinder, including a main combustion chamber, in combination with a sub-combustion chamber provided with an ignition plug and communicating with the main combustion chamber through a small hole in a cylinder wall for jetting out the flame of air-fuel mixture ignited in the subcombustion chamber to the main combustion chamber, the air-fuel mixture being supplied to the sub-combustion chamber through a suction tube from the same carburetor which feeds the main combustion chamber. The carburetor inlet of said suction tube is positioned upstream of a throttle valve and downstream of a venturi portion of the carburetor. A valve is placed at the outlet of the suction tube to the sub-combustion chamber and this valve may be interconnected with a main valve in the suction manifold leading from the carburetor to the main combustion chamber to move in synchronism therewith and with a piston in the cylinder, or it may be arranged to operate automatically in response to the difference of pressure within the sub-combustion chamber and the suction tube.
An internal combustion engine having, in combination, a main combustion chamber in a cylinder communicating with a manifold, a sub-combustion chamber separated from said cylinder by a wall, said sub-combustion chamber communicating with said main combustion chamber by at least one small opening in said wall and having an ignition plug for igniting fuel-air mixture therein, a carburetor connected to said cylinder by the manifold for feeding fuel-air mixture thereto and having a main nozzle including a venturi portion for supplying fuel from the fuel source, and a tube for passage of fuel-air mixture connecting said carburetor to said sub-combustion chamber, said carburetor being provided with a throttle valve positioned downstream of said main nozzle, said tube having one open end projecting into said carburetor at a position between said throttle valve and said main nozzle and the other end having an outlet to the sub-combustion chamber, the open end of said tube being directed upstream and positioned just behind the venturi portion and below an end of said main nozzle, said tube having a venturi restriction therein and a fuel passage, one end of which is connected to a fuel chamber, opening at the other end into said venturi restriction.
Claim 2
Dependent Claim
201 words
An internal combustion engine having, in combination, a main combustion chamber in a cylinder communicating with a manifold, a sub-combustion chamber separated from said cylinder by a wall, said sub-combustion chamber communicating with said main combustion chamber by at least one small opening in said wall and having an ignition plug for igniting fuel-air mixture therein, a carburetor connected to said cylinder by the manifold for feeding fuel-air mixture thereto and having a main nozzle including a venturi portion for supplying fuel from the fuel source, and a tube for passage of fuel-air mixture connecting said carburetor to said sub-combustion chamber, said carburetor being provided with a throttle valve positioned downstream of said main nozzle, said tube having one open end projecting into said carburetor at a position between said throttle valve and said main nozzle and the other end having an outlet to the sub-combustion chamber, the open end of said tube being directed upstream and positioned just behind the venturi portion and below an end of said main nozzle, said tube having a venturi restriction therein and a fuel passage, one end of which is connected to a fuel chamber, opening at the other end into said venturi restriction.
Claim 3
Dependent Claim
48 words
An internal combustion engine according to claim 1, wherein said fuel passage is a pipe, said one end connected to the fuel chamber being connected thereto by a fuel duct through a restricted portion therein, said fuel duct being provided between said fuel chamber and said main nozzle.