Patent ID: 6328004
Filing Date: 2001-12-11
Classification: F02B,F04B

Abstract:
An internal combustion engine comprising:a piston having a crown and skirt housed within a cylinder block in a cylinder bore;the piston connected by a connecting rod to a crankshaft, said connecting rod having respective little and big ends, the piston reciprocating between bottom dead centre (BDC) and top dead centre (TDC), within the cylinder bore;engine bearings for the crankshaft, little and big ends;an air transfer port in the cylinder bore;an exhaust port in the cylinder bore connected to an exhaust pipe;an oil storage sump;a crankcase housing the connecting rod and portion of the crankshaft;an air charging chamber formed by portion of the cylinder bore and the crankcase;an air inlet duct for delivery of air to the charging chamber;air transfer ducting between the charging chamber and the air transfer port;a positive displacement supercharger housing mounted outside the air charging chamber;a diaphragm in the housing dividing the housing into a front delivery chamber communicating via an outlet with the air inlet duct and a rear chamber open to the atmosphere;means for moving the diaphragm across the chamber towards the outlet in a working stroke delivering air to the engine and away from the outlet in a return stroke drawing air into the housing; anda one way valve mounted with the diaphragm to only allow passage of air between the rear and front chambers during the return stroke of the diaphragm away from the outlet.