Abstract A two-cycle internal combustion engine comprising a cylinder having an exhaust port, an exhaust passage, a main scavenging port, a main scavenging passage, an auxiliary scavenging port and an auxiliary scavenging passage; a piston; a connecting rod; a crank shaft; a crank case and an intake reed valve mounted on said crank case for introducing therethrough fuel-air mixture into said crank case; in which the end of said auxiliary scavenging passage open at one end into said crank case is located substantially in alignment with a tangential line of circular periphery of one of crank webs of the crank shaft, which tangential line extends parallel to the axis of said cylinder from crank web portion moving toward said cylinder, and said intake reed valve is located between said open end of the auxiliary intake passage and said crank web in the proximity to said tengential line, whereby a part of the mixture having been drawn into said crank case through said intake reed valve is forcibly fed into said cylinder through said auxiliary scavenging passage and said auxiliary scavenging port under the booster effect of the rotating crank web, thus enhancing the fuel charging efficiency of the engine.
A two-cycle internal combustion engine comprising at least one cylinder each having an exhaust port, main scavenging ports, main scavenging passages, an auxiliary scavenging port and an auxiliary scavenging passage; a piston; a connecting rod; a crank shaft; a crank case and an intake reed valve mounted on said crank case; in which the end of said auxiliary scavenging passage open into said crank case is located substantially in alignment with a tangential line extending from a point on a circular periphery of one crank web of the crank shaft in parallel relation to the axis of said cylinder at the side of the crank web moving toward said cylinder, and said intake reed valve is located between said end of the auxiliary scavenging passage open into said crank case and said crank web in the proximity to said tangential line, whereby part of the mixture having been drawn into said crank case through said intake reed valve is forcibly fed into said cylinder through said auxiliary scavenging passage and said auxiliary scavenging port under the booster effected by the rotation of said crank web.
Claim 2
Dependent Claim
185 words
A two-cycle internal combustion engine comprising at least one cylinder each having an exhaust port, main scavenging ports, main scavenging passages, an auxiliary scavenging port and an auxiliary scavenging passage; a piston; a connecting rod; a crank shaft; a crank case and an intake reed valve mounted on said crank case; in which the end of said auxiliary scavenging passage open into said crank case is located substantially in alignment with a tangential line extending from a point on a circular periphery of one crank web of the crank shaft in parallel relation to the axis of said cylinder at the side of the crank web moving toward said cylinder, and said intake reed valve is located between said end of the auxiliary scavenging passage open into said crank case and said crank web in the proximity to said tangential line, whereby part of the mixture having been drawn into said crank case through said intake reed valve is forcibly fed into said cylinder through said auxiliary scavenging passage and said auxiliary scavenging port under the booster effected by the rotation of said crank web.
Claim 3
Dependent Claim
80 words
A two-cycle internal combustion engine according to claim 1, in which a notch formed on a surface of the crank case mating with the cylinder and serving as one end of said auxiliary scavenging passage and said exhaust port are located in diametrically opposite positions of the cylinder, and a plane including the center of said notch and said exhaust port is inclined at an angle of about 30* to a plane perpendicular to the crank axis of the engine.
Claim 4
Dependent Claim
114 words
A two-cycle internal combustion engine according to claim 2 comprising a plurality of cylinders, the positional arrangement in one cylinder of those inclusive of the exhaust port, a pair of the main scavenging passages, the auxiliary scavenging passage, the notch serving as one end of said auxiliary scavenging open into the crank case, and a pair of notches formed on the mating surface of the crank case in symmetrical relation with each other with respect to the center line of the cylinder and serving as the open ends of said main scavenging passages is substantially in symmetrical relation with that of the next cylinder with respect to the median line between said two cylinders.