Patent ID: 7077088
Filing Date: 2006-07-18
Classification: F01L

Abstract:
1. A desmodromic “springless” valve and adjustable cam system adapted to be installed onto a head configured for an overhead cam for an internal combustion engine having at least one intake and one exhaust valve per cylinder, the system comprising: a main camshaft adapted to be positioned within a plurality of bearing journals transversely positioned and spaced along a longitudinal length of the head; a cam lobe assigned to each valve, each cam lobe adapted to be installed onto the main camshaft, each cam lobe defined by first and second opposing sides, a perimeter edge, a mounting hole disposed through the first and second sides in a normal orientation, and a follower groove formed in each side of the cam which is representative of a desired cam duration; at least one intake and one exhaust valve assigned to each cylinder, each valve adapted to be received within a respective valve guide disposed within the head, each valve having a valve stem with a distal connecting tip exposed above the head; a valve connector installed onto the distal tip of each valve; a hydraulic lifter assigned to each valve which is adapted to be received within a lifter seat disposed within the head, each lifter including a moveable piston within, the piston having piston tip which is exposed above the head; a rocker defined by a valve movement end and lifter end, the valve movement end adapted to be mechanically linked to a respective valve connector and the lifter end adapted to be pressed against a respective piston tip; and a rocker retainer adapted to maintain the lifter end of the rocker depressed against the piston tip of the hydraulic lifter; wherein when the main camshaft rotates, the valve movement end of the rocker moves in manner which results in each valve being moved upwards and downwards as a function of the cam duration and lift, thereby opening and closing each respective valve.