Two-cycle piston-cylinder combination
AssigneeBrunswick Corporation
InventorJames A. Meyer
Life of this patent
Estimating the term…
Abstract
The invention is an improved piston and cylinder arrangement for a loop charged two-stroke engine wherein all input passages are open channels in the cylinder wall and the top annular edge of the piston is rounded. The rounded edge on the piston cooperates with the described scavenging and input passages to reduce drag and, cause the incoming charge to flow more horizontally over the piston head; thereby improving scavenging and volumetric efficiency.
Claims4
A two-cycle internal combustion engine comprising a die castable cylinder block including a crankcase, a cylinder having a head and a cylinder wall extending from said crankcase to said head and a piston adapted for reciprocal movement within said cylinder, an exhaust port through said cylinder wall and a plurality of charge input passages extending from said crankcase into said cylinder, said input passages each comprising an open channel in said cylinder wall, each such channel having wall tapering from said crankcase toward said cylinder head to facilitate withdrawal of casting cores from said block, and wherein one of said passages includes an outer wall 31 portions of which intersect the side wall 18 of the cylinder at acute angles to a lateral plane perpendicular to the axis of the cylinder, said angles decreasing in proportion to the distance of the relevant portion of said outer wall 18 from said exhaust port.
Dependencies are inferred from the claim text.