Carburetor For Stratified Scavenging Two-Stroke Engine
AssigneeYamabiko Corporation
InventorsShirou Yamaguchi, Takamasa Otsuji
Life of this patent
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Abstract
The present invention is to prevent mixing of fresh air and an air-fuel mixture when a throttle valve is fully opened and increase a delivery ratio. A main nozzle (30) is surrounded by a tunnel-like air flow guiding member (52). The air flow guiding member (52) is opened at its front and back sides. A whole amount of fuel discharged via a main nozzle (30) is sent to a downstream side by an air flow created by the air flow guiding member (52). When a throttle valve (22) and a choke valve (24) are both in a fully-opened state, fresh air flows into an air-fuel mixture passage (12) through a gap between these valves (22, 24).
Claims13
A carburetor for a stratified scavenging engine, the carburetor comprising:
- an intake air passage configured to receive air filtered by an air cleaner and create an air-fuel mixture;
- a throttle valve arranged in the intake air passage, the throttle valve being configured by a butterfly valve, wherein, in response to the throttle valve being placed in a fully-opened state, a fresh air passage and an air-fuel mixture passage are formed by the throttle valve, air coming out of the fresh air passage being supplied to an upper portion of a scavenging passage of the stratified scavenging engine, and an air-fuel mixture coming out of the air-fuel mixture passage being supplied to a crankcase of the stratified scavenging engine;
- and
- an air flow guiding member configured to adjust a flow of gas passing through the fresh air passage and/or the air-fuel mixture passage and direct the flow of gas toward a downstream side.
Dependencies are inferred from the claim text.