Induction system for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMasahiro Uchida
Life of this patent
Estimating the term…
Abstract
An induction system and control arrangement for a three valve per cylinder engine, wherein the induction passages are tuned to provide different effective lengths for different engine running conditions. In addition, a control valve arrangement is provided for controlling the flow to the combustion chambers through the valve seats to generate unrestricted flow under high-speed, high-load conditions and tumble and/or tumble and swirl for promoting turbulence under low-speed, low-load conditions.
Claims59
An induction system for an internal combustion engine having a combustion chamber served by at least three intake valve seats, an intake passage arrangement comprised of at least a common section serving each of said intake valve seats, a control valve supported in said common section for controlling the flow therethrough and movable between a first position wherein the flow through each of said valve seats is substantially unrestricted and without significantly affecting the flow direction issuing from said intake valve seats into said combustion chamber and a second position wherein the flow through at least two of said valve seats is substantially restricted and the flow through the other of the valve seats is directed into the combustion chamber in a different direction than when said control valve is in its first position.
A control valve adapted to be disposed between a cylinder head having a pair of intake ports, each serving a respective combustion chamber formed therein in one surface thereof, said control valve assembly comprising a valve housing having a surface adapted to be placed in abutting relationship with the cylinder head surface and having a pair of intake passages extending therethrough and terminating in said surface, a pair of valve elements rotatably journalled within said valve body and each having a larger diameter section and a smaller diameter section, said valve elements being disposed in said valve body with said smaller diameter sections being adjacent to each other, said smaller diameter sections having a tongue and groove connection with each other for simultaneous rotation.
Dependencies are inferred from the claim text.