Patent ID: 6662764
Filing Date: 2003-12-16
Classification: F01M,F02B

Abstract:
An improvement of two stroke engine mainly comprises a sleeve piston over wrapped on the main piston, wherein the sleeve piston controls the opening and closing of the intake way and the exhaust way while the piston moves up and down in the cylinder and block the engine oil from leaking out of the crank case, it is unnecessary to mix engine oil into gasoline for the two-stroke engine of the invention, it produce the clean exhaust, which meets the emission standard, and the main characteristics are:the sleeve piston comprises a main piston and a sleeve piston; the main piston has the piston ring serving the sealing function and a taper at the lower part; the sleeve piston has a chamber with a large size groove race on the top and provides two sealing rings; the taper of the main piston is inserted into the chamber of the sleeve piston to form an integral sleeve piston assembly.