Patent ID: 6142113
Filing Date: 2000-11-07
Classification: F02B

Abstract:
A two-cycle internal combustion engine comprising:(a) a crankcase;(b) a piston mounted on a connecting rod supporting said piston for reciprocating movement, said connecting rod being mounted on a crankshaft rotatable in said crankcase; and(c) a cylinder comprising:(i) a cylinder bore receiving said piston;(ii) a suction inlet formed in an inner wall of the cylinder;(iii) an exhaust outlet formed in an inner wall of the cylinder opposite the suction inlet;(iv) at least one scavenging path formed in an inner wall of the cylinder that fluidly connects to the crankcase;(v) at least one scavenging port that fluidly connects the at least one scavenging path to the cylinder bore;(vi) a bridge part disposed below the at least one scavenging port and spanning the scavenging path, wherein an upper edge of the bridge part defines a lower edge of the at least one scavenging port;(vii) at least one partial wall partition that separates the at least one scavenging path from the cylinder bore, wherein a lower edge of the bridge part defines a top edge of the at least one partial wall partition; and(viii) at least one cooling port disposed in the partial wall partition, said at least one cooling port fluidly connected to the cylinder bore and the piston, and wherein-said at least one cooling port enables gas in said at least one scavenging path to contact the piston in said cylinder bore.