STRATIFIED SCAVENGING ENGINE AND PORTABLE WORK MACHINE
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United States of America
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Issued Date -
Mar 26, 2020
app pub date -
Aug 28, 2019
filing date -
Aug 28, 2019
priority date (Note) -
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Abstract
Provided is a stratified scavenging engine and a portable work machine that suppress THC sufficiently. A stratified scavenging engine includes: a cylinder having a cylinder bore; and a piston stored in the cylinder bore to be movable in a reciprocating manner. The cylinder has an intake port to intake leading air and a scavenging port to scavenge combustion gas, the intake port and the scavenging port being open to the cylinder bore. The piston has a peripheral surface including a piston groove to guide leading air from the intake port to the scavenging port, and the piston groove has a recess near the intake port.
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