Valve actuating structure for multi-valve engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHiroyuki Tsuzuku, Tetsushi Saito, Naoki Tsuchida
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Abstract
A number of embodiments of multiple-valve internal combustion engines having at least some of the valves being deactivatable by means of a hydraulic tappet assembly so as to control the flow path and flow pattern into and out of the combustion chamber. A hydraulic system is provided for controlling which of the valves operate and, if desired, the lift of the valves.
Claims35
A valve operating mechanism for a reciprocating machine, said machine having a flow path with a valve seat at one end thereof, a poppet-type valve having a head portion cooperating with said valve seat for controlling the flow therethough and a stern portion supported for reciprocation about a valve axis for opening and closing said valve seat, a single cam lobe, a tappet body engaged by and operated by said single cam lobe and reciprocal about an axis parallel to said valve axis, a valve actuator element slidably supported or movement relative to said tappet body in the direction of said valve axis and spaced from engagement with said single cam lobe in all positions of said single cam lobe and engageable with said valve stem for controlling the position of said valve stem, and means for selectively providing a direct mechanical coupling of said tappet body to said valve actuator element for simultaneous movement therewith to control the position of said valve by the position of said tappet body.
Dependencies are inferred from the claim text.