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US 12,429,020 B2Granted
Two-stroke engine with crankcase fuel injector
OwnerTerutaka Yasuda, Ryota Matsuzawainventors
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Abstract
A two-stroke engine includes a cylinder having an intake port, a piston configured to open and close the intake port by reciprocating in the cylinder, a crankcase connected to the cylinder and including a crank chamber, a crank assembly located in the crank chamber, a connecting rod having a first end connected to the piston and a second end connected to the crank assembly, and a fuel injector attached to the crankcase and configured to inject mixed fuel to the second end.
Claims14
A two-stroke engine of a piston valve type comprising:
- a cylinder including a bore portion and an intake port fluidly coupled with the bore portion;
- a piston located in the bore portion and configured to open and close the intake port by reciprocating along an axial direction of the cylinder;
- a crankcase connected to the cylinder and including a crank chamber;
- a crank mechanism located in the crank chamber and configured to rotate about a crankshaft, wherein the crank mechanism includes a pair of rotating crank webs connected to the crankshaft and separated from each other in an axial direction of the crankshaft;
- a connecting rod having a first end connected to the piston and a second end connected to the crank mechanism and configured to move in a circular trajectory, wherein the second end is larger than the first end;
- and
- a fuel injector attached to the crankcase and configured to inject mixed fuel, including a combustible fuel and an oil additive, toward the second end,
- wherein the cylinder includes a scavenging hole having an inlet toward the crank chamber,
- wherein the fuel injector comprises an injection port that protrudes into the crank chamber and is configured to spray at least a portion of the mixed fuel toward the second end of the connecting rod, with the piston located at a top dead center, in a fuel path that is tangential to the circular trajectory of the second end,
- wherein a portion of the injection port passes through a gap formed between the pair of rotating crank webs as the second end moves in the circular trajectory, and
- wherein the inlet is located between the injection port and the second end of the connecting rod, with the piston located at the top dead center, when viewed from the axial direction of the crankshaft.
8 more elements
A two-stroke engine comprising:
- a cylinder including an intake port;
- a piston configured to open and close the intake port by reciprocating in the cylinder;
- a crankcase connected to the cylinder and including a crank chamber;
- a crank assembly located in the crank chamber and including:
- a crankshaft;
- a first crank web connected to the crankshaft and configured to rotate around the crankshaft;
- and
- a second crank web connected to the crankshaft, located apart from the first crank web, and configured to rotate around the crankshaft;
- a connecting rod including a first end connected to the piston and a second end connected to the crank assembly, wherein the second end is configured to move in a circular trajectory in conjunction with a reciprocating motion of the piston;
- and
- a fuel injector attached to the crankcase and configured to spray mixed fuel, including a combustible fuel and an oil additive, toward the second end,
- wherein the cylinder comprises:
- a bore portion in which the piston reciprocates;
- a combustion chamber fluidly coupling with the bore portion;
- and
- a scavenging hole including an inlet directed toward the crank chamber,
- wherein the fuel injector comprises an injection port that protrudes toward the second end in the crank chamber and is configured to spray the mixed fuel toward the second end of the connecting rod, with the piston located at a top dead center,
- wherein a portion of the injection port passes through a gap formed between the first crank web and the second crank web as the second end moves in the circular trajectory, and
- wherein the inlet is located next to the injection port in a circumferential direction of the bore portion.
16 more elements
Dependencies are inferred from the claim text.