Two-stroke cycle internal combustion engine
AssigneeKioritz Corporation
InventorTsuneo Araki
Life of this patent
Estimating the term…
Abstract
A two-stroke cycle internal combustion engine has a quaternary Schnürle-type scavenging system that is configured such that the capacity of a pair of second scavenging passageways are made larger than the capacity of a pair of first scavenging passageways, so that during the descending stroke of the piston, air is allowed to be introduced into the combustion actuating chamber from the second scavenging passageways prior to the introduction of the air-fuel mixture and at the same time, a relatively large quantity of air is allowed to be introduced into the combustion actuating chamber from the first scavenging passageways over a longer period of time as compared with the period of time in which air is introduced from the second scavenging passageways.
Claims23
A two-stroke cycle internal combustion engine, comprising
- a cylinder and a piston defining a combustion actuating chamber;
- a crankcase below the piston and defining a crank chamber;
- and
- a Schnürle-type scavenging system that includes
- an exhaust port,
- a pair of first scavenging passageways communicating the combustion actuating chamber with the crank chamber and disposed closer to the exhaust port, the first scavenging passageways being disposed symmetrically with respect to a longitudinal plane that bisects the exhaust port,
- a pair of second scavenging passageways communicating the combustion actuating chamber with the crank chamber and disposed farther from the exhaust port, the second scavenging passageways being disposed symmetrically with respect to the longitudinal plane,
- an air passageway for introducing air into the first scavenging passageways, and
- an air-fuel mixture passageway for introducing an air-fuel mixture from an air-fuel mixture-generating device into the crank chamber, and
- wherein the scavenging system is configured such that during a descending stroke of the piston, the exhaust port opens first, a first scavenging port formed at a downstream end of each first scavenging passageway opens after the exhaust port opens, and a moment later, a second scavenging port disposed at a downstream end of each second scavenging passageway opens, whereby air is introduced into the combustion actuating chamber from each first scavenging port prior to the introduction of the air-fuel mixture into the combustion actuating chamber from each second scavenging port.
A two-stroke cycle internal combustion engine, comprising
- a cylinder and a piston defining a combustion actuating chamber above the piston;
- a crankcase below the piston and defining a crank chamber;
- and
- a Schnürle-type scavenging system that includes
- an exhaust port,
- a pair of first scavenging passageways communicating the combustion actuating chamber with the crank chamber and disposed closer to the exhaust port, the first scavenging passageways being disposed symmetrically with respect to a longitudinal plane that bisects the exhaust port,
- a pair of second scavenging passageways communicating a combustion actuating chamber with the crank chamber and disposed farther from the exhaust port, the second scavenging passageways being disposed symmetrically with respect to the longitudinal plane,
- an air passageway for introducing air into the first scavenging passageway;
- and
- an air-fuel mixture passageway for introducing an air-fuel mixture from an air-fuel mixture-generating device into the crank chamber,
- wherein the scavenging system is configured such that during the descending stroke of the piston and at least in the initial stage of a scavenging period during which a first scavenging port formed at a downstream end of each first scavenging passageway and a second scavenging port formed at a downstream end of each second scavenging passageway are opened, only air is allowed to be introduced into the combustion actuating chamber from the first and second scavenging ports.
Dependencies are inferred from the claim text.