Patent ID: 8910606
Filing Date: 2014-12-16
Classification: F01L,F02B

Abstract:
1. An internal combustion engine comprising: a combustion chamber; a reciprocating sleeve valve having a cylindrical bore and configured to cooperate with a valve seat to open and close a passage in fluid communication with the combustion chamber; a camshaft operably coupled to the valve and configured to rotate about a central axis; a cam lobe carried by the camshaft and having an exterior profile at least partially defined by a first surface portion and a second surface portion; and a rocker arm operably disposed between the valve and the cam lobe, wherein the first surface portion is spaced apart from the central axis by a first distance and the second surface portion is spaced apart from the central axis by a second distance, greater than the first distance, wherein the first surface portion positions the valve in contact with the valve seat and presses the valve against the valve seat with at most a first force, and wherein the second surface portion presses the valve against the valve seat with a second force, greater than the first force, during rotation of the camshaft about the central axis.