Patent ID: 11946408
Assignee: YAMABIKO CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A two-stroke internal combustion engine, comprising:
a cylinder, which defines a combustion chamber, and has an exhaust port;
an ignition device configured to ignite an air-fuel mixture in the combustion chamber;
a piston configured to reciprocate inside the cylinder through combustion and expansion that occur in the combustion chamber;
a crank chamber communicating with an interior of the cylinder;
a crankshaft, which is disposed in the crank chamber, and is operationally coupled to the piston;
a fuel injection valve configured to supply a fuel to the crank chamber;
an intake passage configured to allow only air to be sucked thereinto under a negative pressure generated in response to the piston being actuated;
an air cleaner connected to the intake passage, and configured to purify the air into the intake passage; and
a scavenging passage that allows communication between the crank chamber and the combustion chamber,
wherein the intake passage branches into a first intake passage and a second intake passage,
wherein the first intake passage directly connects with the crank chamber, and the second intake passage directly connects with the scavenging passage,
the air that has been purified by the air cleaner branches from the intake passage into both of the first intake passage and the second intake passage, and the air that has been branched into the first intake passage and the second intake passage is then sucked into the crank chamber, and
wherein the fuel injection valve is controlled to be opened and closed by a controller and configured to inject the fuel toward the crank chamber, and air stagnant in the scavenging passage from the second intake passage at end of air suction serves as leading air to contribute to scavenging.