Patent ID: 7921817
Filing Date: 2011-04-12
Classification: F01L,F01P,F02B,F02D,F02F,Y02T

Abstract:
1. An internal combustion engine, comprising: a body comprising a cylinder block; a piston disposed in a cylinder formed within the cylinder block; a port in the body to allow air and fuel into an internal volume within the cylinder; a drive shaft having a bearing section mounted for rotation on a respective drive shaft axis through the body and having an offset throw section, the piston and offset throw section of the drive shaft being connected such that reciprocating movement of the piston increases and decreases a size of the internal volume between minimum and maximum sizes; and a sleeve valve positioned in the cylinder and at least partially encircling the piston, the sleeve valve comprising a sleeve portion and a lip disposed at an end surface, the lip comprising an inner surface directed inward toward the internal volume and an outer surface directed away from the internal volume, the sleeve valve being movable in an axial direction between a first position where the port is open and a second position where the sleeve valve closes the port, the sleeve valve closing the port in the second position by at least part of the outer surface of the lip contacting a valve seat, the inner surface experiencing a positive pressure differential relative to the outer surface of the lip when gases within the internal volume are compressed by movement of the piston, the positive pressure differential applying an additional force in the axial direction toward the second position that assists in closing the port.