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US 4,294,205 AGranted
Internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasahiko Iiyama, Tsugio Sanka, Kenji Naito
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasahiko Iiyama, Tsugio Sanka, Kenji Naito
Estimating the term…
A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively. One of the main and sub-throttle valves has an outside diameter smaller than the inside diameter of the associated intake passage so that the ratio of the open areas of the main and sub-intake passages is not constant as the throttle shaft is operated. Thereby, the ratio of weight of air introduced into the sub-combustion chamber to the weight of air introduced into the main combustion chamber can be controlled in accordance with the load condition of the engine.
In a multi-cylinder internal combustion engine having, for each cylinder provided with a reciprocal piston therein, a main combustion chamber defined above the piston and a sub-combustion chamber defined above said main combustion chamber and communicating with the latter through a torch nozzle, a carburetor having a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to said main and sub-combustion chambers, respectively, said carburetor comprising a single throttle valve shaft extending across said main and sub-intake passages, a main throttle valve and a sub-throttle valve disposed in said main and sub-intake passages, respectively, said main and sub-throttle valves being attached to said single throttle valve shaft, one of said main and sub-throttle valves having an outside diameter smaller than the inside diameter of the associated intake passage so that the ratio of the open areas of said main and sub-intake passages is not constant as said throttle valve shaft is operated.
Dependencies are inferred from the claim text.