Patent ID: 6308677
Filing Date: 2001-10-30
Classification: F01L

Abstract:
An overhead rotary valve assembly and a cylinder head that operates with a conventional internal combustion engine block, consisting of a plurality of cylinders and the cylinder head with upper and lower intake gas passages and an upper and lower exhaust gas passages with an overhead rotary valve spool being mounted in the cylinder head for rotation, which has ports or bores for intake and exhaust gases that become aligned with the upper and lower intake passages and the upper and lower exhaust passages in the cylinder head, depending on the angle of rotation and the rotary valve assembly has a plurality of oil-lubricated, surface seal sleeve bearings and annular sealing rings comprised of a low friction fluoropolymer supported by a sinter metal and annular sealing rings being retained in corresponding grooves, that surround said valve spool that are axially adjacent to the ports in the rotary valve member where the overhead rotary valve annular seals provided between the valve member and the cylinder head inhibit encircling leakage of gases there between and the bearings and seals have an anti-friction fluoropolymer material on the sliding surfaces thereof and,the invention in which said rotation further consists of: a driving sprocket, a driven sprocket and a timing belt or a chain, with the driving sprocket being fastened to a crankshaft and the driven sprocket being secured to the one end of the rotary valve member for driving the valve shaft in synchronism with the reciprocation of the pistons in the cylinder.