Induction system for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYoshiharu Isaka
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Abstract
A number of embodiments of induction system for internal combustion engines employing multiple intake valves. The induction systems are designed so as to provide substantially unrestricted charging and axial flow into the cylinder bore when running under high-speed, high-load conditions. A control valve is provided which changes the effective configuration of the induction passages so as to provide a slant tumble action under lower speed and load conditions. Various arrangements are disclosed for altering the amount of slant action and providing slant actions in opposite or the same direction. In addition, a single control valve element is provided for achieving this effect in a three poppet valve per cylinder engine.
Claims33
An induction system for an internal combustion engine having a cylinder bore defining in part a combustion chamber, induction passage means for delivering a charge to said combustion chamber, said induction passage means providing a generally axially unrestricted flow of the charge into said combustion chamber of said cylinder bore, and control valve means in said induction passage means and movable between a first position wherein the flow of the charge into the combustion chamber is generally unrestricted and in a generally axial direction and a second position to redirect the flow into the combustion chamber in a direction to generate a slant tumble flow with the charge flowing in a tumble motion around an axis transverse to the axis of the cylinder bore and at an angle to a plane containing the cylinder bore and tumble axis.
Dependencies are inferred from the claim text.