Stratified scavenging engine and portable work machine
AssigneeYamabiko Corporation
InventorsShiro Yamaguchi, Ken Shirai, Tetsuya Isogai
Life of this patent
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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.
Claims9
A stratified scavenging engine comprising:
- a cylinder having a cylinder bore;
- and a piston stored in the cylinder bore to be movable in a reciprocating manner, the cylinder having 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, wherein
- the piston has a peripheral surface defining a piston wall, the piston including an arcuate piston groove to guide leading air from the intake port to the scavenging port,
- the arcuate piston groove has a semi-circular recess near the intake port, and
- wherein the semi-circular recess has an apex at a deepest part relative to the peripheral surface and the deepest part being most proximal to a first border, and
- wherein a portion of the piston wall extends away from the apex towards the peripheral surface thereby blocking airflow through the semi-circular recess.
Dependencies are inferred from the claim text.