Internal-combustion engines – Poppet valve operating mechanism – Valve driven closed
Reexamination Certificate
2005-09-27
2005-09-27
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Valve driven closed
C123S090160, C123S090270
Reexamination Certificate
active
06948468
ABSTRACT:
The present invention provides an exemplary rockerless desmodromic valve and adjustable overhead cam system adapted to be installed onto a head for an internal combustion engine which utilizes at least one valve for each intake and exhaust port. The system includes a plurality of valves having a retaining sphere disposed on a distal tip of a stem of each valve; a camshaft; and a split cam lobe assembly assigned to each valve. The split cam lobe assemblies include a left and right cam lobe, a camshaft receiving hole oriented transversely through each cam lobe adapted to slidably receive the camshaft, and a cam following groove halve disposed on the interior side. Furthermore, the interior sides of the left and right cam lobe are adapted to be interfaced together to form a following groove having a generally spherical cross-sectional shape adapted to slidably receive the retaining sphere from a respective one of the valves. The system further includes a plurality of springs concentrically disposed around the camshaft and further longitudinally positioned between cam lobe assemblies and the bearing journals, wherein the plurality of springs maintain a constant force against the exterior sides of the cam lobes to maintain the split lobe cam assemblies compressed together.
REFERENCES:
patent: 1644059 (1927-10-01), Holle
patent: 4711202 (1987-12-01), Baker
patent: 2004/0094108 (2004-05-01), Battlogg
Website printout dated Feb. 11, 2004; 2 pages; Classification; http://members1.chello.nl/˜wgj.jansen/text/classification.html.
Website printout dated Feb. 11, 2004; 8 pages; One Hundred Years of Desmo-Patenting; http://members1.chello.nl/˜wgj.jansen/text/honderdjaar.html.
Decuir Engine Technologies, LLC
Denion Thomas
Eshete Zelalem
LandOfFree
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