Patent ID: 6209495
Filing Date: 2001-04-03
Classification: F01B,F02B,F05B

Abstract:
A two stroke engine comprising;a housing;an output shaft rotatable supported within the housing about a drive axis;a pair of opposed cylinder bores in the housing extending along a common axis, the bores extending outwardly from the drive axis from respective inner ends to respective outer ends of the bores;a scavenge valve mounted at the outer end and an exhaust valve mounted towards the inner end of each bore;a pair of piston heads mounted within the respective bores defining an inner chamber adjacent an inner face and a main combustion chamber adjacent an outer face of each piston head, each piston head being movable between a top dead centre position adjacent the outer end and a bottom dead center position adjacent the inner end of the corresponding bore;a pair of connecting rods extending along the common axis mounted on the respective inner faces of the piston heads at respective first ends of the connecting rods, the connecting rods being supported for linear sliding motion along the common axis;rotary drive means coupling respective second ends of the connecting rods to the output shaft for translating linear motion of the connecting rods to rotary motion of the output shaft;a sealing member mounted about each connecting rod arranged to seal the inner chamber of the corresponding cylinder bore from a central chamber supporting the rotary drive means therein such that lubricating oil associated with the rotary drive means is prevented from leaking into the exhaust valves.