Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof
AssigneeYamabiko Corporation
InventorsTakahiro Yamazaki, Shirou Yamaguchi, Takamasa Otsuji
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Abstract
A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve 204 and a choke valve 242, and a gap 244 between the valves 204 and 242 is opened. Intake air in both of an upper region and a lower region of the choke valve 242 flows into an air-fuel mixture passage 246 in a lower region of the fully-open throttle valve 204. A main nozzle 202 is arranged so as to be inclined toward the throttle valve 204.
Claims15
A carburetor for a stratified two-stroke scavenging type engine, the carburetor being interposed between an engine body of the stratified scavenging two-stroke engine and an air cleaner, the carburetor comprising:
- an intake air passage that receives air filtered by the air cleaner;
- a throttle valve that is arranged in the intake air passage and is composed of a plate butterfly valve;
- and
- a main nozzle or a main port that discharges fuel toward a plate surface of the throttle valve in a fully-open state,
- wherein an upstream side of the throttle valve is composed of an open space with no dividing wall.
Dependencies are inferred from the claim text.