Outboard motor
AssigneeYamaha Marine Kabushiki Kaisha
InventorKoei Kokubo
Life of this patent
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Abstract
An outboard motor has an air intake manifold with a plurality of intake runners and a surge tank. The runners extend from combustion chambers of an internal combustion engine to the surge tank. The air intake manifold is positioned next to one side of the internal combustion engine. An idle regulating valve supplies secondary air from the atmosphere to the air intake manifold. Secondary Air flows into the idle regulating valve through an air intake port. The secondary air flows out of an air supply port of the idle regulating valve into the surge tank. The idle regulating valve is located in a space between the internal combustion engine and the air intake manifold. The air supply port of the idle regulating valve opens directly into the surge tank.
Claims20
An outboard motor comprising a multi-cylinder internal combustion engine having combustion chambers each being defined by a cylinder head, piston, and cylinder bore, an air intake manifold configured to introduce primary air and secondary air from the atmosphere into the internal combustion engine, the air intake manifold having a plurality of intake runners located next to one side of the internal combustion engine and extending from the cylinder head to a surge tank, and an idle regulating valve arranged to supply secondary air from the atmosphere to the surge tank, the idle regulating valve comprising an air intake port configured to receive secondary air and an air supply port arranged to supply the secondary air from the idle regulating valve to the surge tank, at least a portion of the idle regulating valve being positioned in a space between the internal combustion engine and the air intake manifold, and the air supply port of the idle regulating valve opening directly into the surge tank.
An outboard motor comprising an internal combustion engine, an air intake system including an air intake manifold having a surge tank and a plurality of intake runners, the intake runners positioned adjacent to the internal combustion engine and extending from the surge tank toward corresponding combustion chambers of the internal combustion engine, and an idle regulating valve in fluid communication with the air intake manifold, the idle regulating valve comprising an air intake port configured to receive secondary air and an air supply port arranged to deliver secondary air to the air intake manifold, at least a portion of the idle regulating valve being interposed between the internal combustion engine and the air intake manifold.
Dependencies are inferred from the claim text.