Low noise valve train
CA 1309624 C · Owner: General Motors Corporation · Inventors: Beardmore, John M.; Cafeo, John A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A low noise valve train for actuating poppet valves in an internal combustion engines includes a camshaft cam profile including a preopening bluff ramp to compress the valve train prior to opening each valve with its opening ramp and a post closing bluff ramp to quickly release compression of the valve train after closing of each valve with its closing ramp together with opening and closing ramps yielding low velocity opening and closing of the valves. The result is a combination of valve train pre and post compression to obtain low opening and closing velocities for the valves while avoiding extended operation with the valve train compressed by the action of the …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.