Patent ID: 7383797
Filing Date: 2008-06-10
Classification: F01L,F02B,Y02T

Abstract:
1. A dual piston apparatus for use in a combustion engine, comprising: a first cylinder housing a first piston therein; a second cylinder housing a second piston therein, wherein the first and second cylinders are located adjacent to each other such that at least a portion of a surface of the first cylinder is adjacent to and fluidly coupled to at least a portion of a surface of the second cylinder; an intake valve coupled to the first cylinder for allowing a charge to enter into the first cylinder, wherein the first piston performs only intake and compression strokes; an exhaust valve coupled to the second cylinder for allowing an exhaust gas to exit the second cylinder, wherein the second piston performs only combustion and exhaust strokes; and an interstage valve located proximate to the adjacent surface portions of the first and second cylinders so as to fluidly couple an internal chamber of the first cylinder to an internal chamber of the second cylinder, wherein the adjacent surface portions of the first and second cylinders abut one another so as to decrease dead space within the interstage valve and wherein the first cylinder operates at a cooler temperature than the second cylinder.