Patent ID: 6817326
Filing Date: 2004-11-16
Classification: F01L

Abstract:
A valve system for charging and exhausting of combustion chambers of internal combustion engines including;(a) a cylinder head adapted for securing to a multi-level combustion chamber, the cylinder head including asymmetrical ports which open into the combustion chamber on separate levels; (b) each port controlled by a valve member larger than the port, the valve member of similar shape as the port, each valve member providing a flat sealing area for contacting the port periphery; (c) each valve member having a non-centered cylindrical stem operatively traveling in a cylindrical valve guide sealed by a valve guide seal, each valve stem protruding through an end of the valve guide opposite the combustion chamber to locate a valve spring and accept a follower which captures the valve spring; and (d) each follower operatively associated with a valve operating camshaft assembly to selectively provide axial movement and rotational movement to each valve member and valve stem, the camshaft assembly including a cam shaft having a cam segment associated with each follower and valve member, the cam segment including a protrusion operating on the follower to provide axial movement of the valve member and valve stem, and a circumferential cam groove operating on a driven pin of the follower to provide rotational movement to the valve and valve stem; (e) whereby the valve operating camshaft assembly first moves the valve member a nominal distance from the port periphery to unseal the port, then rotates the valve member in one direction to open the associated port, next rotates the valve member in an opposite direction to close the associated port, and finally moves the valve member a nominal distance to contact the port periphery and seal the port.