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US 2018/0080369 A1Published application
Two-stroke internal combustion engine
AssigneeHusqvarna AB
InventorsAlexander Lundgren, Joel Berneklev, Tommy Shoug
Life of this patent
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AssigneeHusqvarna AB
InventorsAlexander Lundgren, Joel Berneklev, Tommy Shoug
Estimating the term…
An internal combustion engine (10), including a cylinder (15) with a cylinder wall (12) defining a combustion chamber (32), a piston (13) reciprocally disposed within the combustion chamber (32) a crankcase (16) including a crankshaft (11) rotatably disposed therein, the piston (13) being connected to the crankshaft (11) by a connecting rod (17), a first scavenger duct (3) extending between the combustion chamber (32) and the crankcase (16), the first scavenger duct (3) including a top port (31a) and a bottom port (31b), a fuel and air inlet channel (22) in fluid communication with the crankcase (16) by way of a piston ported fuel and air inlet port (23) so that the fuel and air inlet channel (22) delivers a fuel and air mixture to the crankcase (16), and an airhead channel (6) in fluid communication with the first scavenger duct (3) by way of a first piston ported air inlet port (7), characterized in that the fuel and air inlet channel (22) is in fluid communication with the airhead channel (6) so that the fuel and air mixture is combinable with the air flow from the airhead channel (6).
A scavenging two-stroke internal combustion engine, comprising:
A method of an effective starting an internal scavenging two-stroke combustion engine including a cylinder with a cylinder wall defining a combustion chamber;
The method according to claim 8, characterized by providing a flow path formed in an outer surface of the piston for the fluid communication between the air and fuel mixture channel and the combustion chamber.
The method according to claim 9, characterized by providing a crossover channel formed in the cylinder wall for the fluid communication between the fuel and air mixture inlet channel and the combustion chamber via the airhead channel.
The method according to claim 10, characterized by providing an idle start valve in the crossover channel, the valve is open only during the start of the engine, when the air inlet valve is in the closed position.
Dependencies are inferred from the claim text.