Patent ID: 6748909
Filing Date: 2004-06-15
Classification: F02B

Abstract:
A two-stroke or four-stroke internal combustion engine, operating by admitting a carbureted mixture or by admitting fresh air with the direct or indirect injection of fuel, the engine having at least one engine cylinder, an engine piston which executes a reciprocating movement in said engine cylinder, said engine piston coupled by a connecting rod to a wrist pin of a crankshaft so as to drive said crankshaft in rotation, and at least one compressor having a compressor cylinder and a compressor piston engaged in said compressor cylinder so as to define at least one variable-volume compression chamber, wherein said compression chamber is connected to said engine cylinder by an inlet pipe in order to supercharge the engine cylinder with carbureted mixture or with fresh air, said inlet pipe ending at an inlet member of the engine cylinder, wherein said engine comprises a coupling means for coupling said compressor piston to said crankshaft, said coupling means arranged to drive said compressor piston in a reciprocating movement in said compressor cylinder in coordination with the movements of said engine piston as said crankshaft rotates, wherein said compressor piston produces a supercharging pressure spike in said compressor cylinder at a certain point of a compression stroke of said compressor piston, wherein said coupling means is designed as a function of a length of said inlet pipe and a predetermined operating speed so that said supercharging pressure spike propagating through said inlet pipe between said compressor cylinder and said engine cylinder reaches said engine cylinder at practically the same time as said inlet member is shut off when the engine operates at said predetermined speed.