Two-cycle engine and engine tool comprising the same
AssigneeHitachi Koki Co., Ltd.
InventorNaoto Ichihashi
Life of this patent
Estimating the term…
Abstract
The two-cycle engine comprises a first scavenging opening and second scavenging opening on the inner peripheral wall of a cylinder bore, and a first scavenging passage and second scavenging passage connecting the first scavenging opening and second scavenging opening to the crank chamber. The first and second scavenging passages are provided with an outflow direction change device directing the outflow of an air-fuel mixture flowing out from near the top dead center of the first and second scavenging openings into the cylinder bore and the outflow of the air-fuel mixture flowing out from near the bottom dead center of the first and second scavenging openings into the cylinder bore in different directions.
Claims17
A two-cycle engine comprising:
- a cylinder block having a cylinder bore;
- an exhaust opening and scavenging opening formed on the inner peripheral wall of said cylinder bore;
- a scavenging passage extending in the direction of the axial line of said cylinder bore and connecting said scavenging opening and a crank chamber communicating with said cylinder bore;
- and
- an outflow direction change device provided in said scavenging passage for directing the outflow of an air-fuel mixture flowing out from near the top dead center of said scavenging opening into said cylinder bore and the outflow of the air-fuel mixture flowing out from near the bottom dead center of said scavenging opening into said cylinder bore in different directions when seen in the direction of the axial line of said cylinder bore.
A two-cycle engine comprising:
- a cylinder block having a cylinder bore;
- an exhaust opening and scavenging opening formed on the inner peripheral wall of said cylinder bore;
- and
- a scavenging passage extending in the direction of the axial line of said cylinder bore, connecting said scavenging opening and a crank chamber communicating with said cylinder bore, and having an upper scavenging passage part connected to said scavenging opening and extending in the direction from the top dead center to the bottom dead center and a lower scavenging passage part having a width larger than the width at the lower end of said upper scavenging passage part in the circumferential direction of said cylinder bore when seen in the direction of the axial line of said cylinder bore, connected to the lower end of said upper scavenging passage part, and extending toward said crank chamber,
- wherein said upper scavenging passage part is connected to said lower scavenging passage part in an offset manner in the direction away from said exhaust opening in the circumferential direction of said cylinder bore.
Dependencies are inferred from the claim text.