Crankcase scavenged two-stroke internal combustion engine having an additional air supply
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United States of America Patent
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Dec 22, 2009
Grant Date -
Dec 11, 2008
app pub date -
Jul 16, 2004
filing date -
Jul 16, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A crankcase scavenged two-stroke internal combustion engine (1) having an additional air supply (2) arranged to its transfer ducts (3), connecting a crankcase volume (4) and a transfer port (5). There is at least one recess (6, 24) in a piston (7) arranged below a piston ring (10, 11), and further there is a flow channel (12; 13; 14) arranged in the piston or in a cylinder wall (29) of the engine cylinder (9), and the recess is arranged to register with the transfer port and the flow channel for certain first piston positions, i.e. to create a communication between the transfer port/s and the crankcase volume.
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