Details
The helical camshaft very distantly belongs to the very numerous general “coaxial-shaft-combined-profile” class of cams as most recently typified by the work from Clemson University (whose cams are essentially identical in principle to many other cams, such as U.S. Patent 1,527,456).
The helical camshaft importantly differs from other members of this general class by having a unique helical movement – a combined circumferential and axial movement of the two profiles.
The duration can be increased until the closing flank of the cam lobe reaches the opening flank – a duration of 720 degrees. In a typical application the helical camshaft would have a continuous duration range from about average for a road-going general purpose engine (about 250 degrees measured at normal valve clearance) to about 100 or 150 degrees above this.
The valve is opened at normal rates of acceleration, jerk, etc., and then held open at its maximum lift for whatever duration is required before being closed at a normal rate.
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