Patent ID: 6907850
Filing Date: 2005-06-21
Classification: F02B

Abstract:
1. An engine capable of internally combusting a mixture of air and fuel, comprising: (a) at least one combustion chamber having at least one intake port and at least one exhaust port; (b) a piston disposed in said combustion chamber; (c) at least one crankshaft; (d) a crankcase for housing said crankshaft and maintaining a sufficient amount of lubricating oil in said engine to reduce mechanical wear caused by friction; (e) at least one connecting rod connecting said piston to said crankshaft, and converting reciprocal motion of said piston into rotational motion of said crankshaft; (f) at least one scavenging pump assembly comprising an air cylinder and an air diaphragm disposed in said air cylinder; wherein said air diaphragm and said air cylinder are colinearly aligned with said piston and said combustion chamber; wherein said air diaphragm is colinearly actuated by said piston, without interfering with the movement of said crankshaft, using an air diaphragm connecting member that passes through said crankcase, adapted to rigidly connect said air diaphragm to said piston; wherein when said piston performs a compression stroke, said piston causes said air diaphragm to produce a negative pressure in said air cylinder and to draw in intake air or an intake mixture of air and fuel; wherein when said piston performs an intake stroke, said piston causes said air diaphragm to controllably pressurize the intake air or intake mixture of air and fuel; and wherein said air diaphragm additionally comprises at least one seal ring adapted to provide a relatively tight seal between said air diaphragm and said air cylinder to isolate the intake air or intake mixture of air and fuel from lubricating-oil contained in the crankcase; and (g) at least one muting assembly adapted to route the intake air or intake mixture of air and fuel in said air cylinder to said combustion chamber, without exposing the intake air or the intake mixture of air and fuel to the lubricating oil contained in said crankcase.