Patent ID: 8127724
Filing Date: 2012-03-06
Classification: F02B,Y10T

Abstract:
1. A cylinder block for a two-cycle combustion engine comprising: a cylinder bore; a combustion chamber defined in the cylinder bore; an intake passage for charging an intake gas; an exhaust passage for discharging an exhaust gas from the combustion chamber; a scavenging passage extending between the combustion chamber and a crankcase chamber below the cylinder bore to communicate them together, and having a scavenging port defined in the cylinder bore so as to open at an inner peripheral surface forming the cylinder bore, the scavenging passage being delimited by a first side wall adjacent the intake passage, a rear wall away from the scavenging port and a second side wall adjacent the exhaust passage; a throughhole defined in the first or second side wall of the scavenging passage on one side adjacent the intake passage or the exhaust passage and communicating an upper portion of the scavenging passage, including the scavenging port, with the intake passage or outside of the cylinder bore; and a lid affixed to an external surface of the scavenging passage such that the throughhole is permanently sealed.