Outboard motor
AssigneeYamaha Marine Kabushiki Kaisha
InventorsTakayuki Osakabe, Yoshibumi Iwata
Life of this patent
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Abstract
An outboard motor is mounted on a hull and has an engine disposed in an upright position in a cowling so that a crankshaft thereof extends generally vertically during cruising. An embodiment of the motor includes a first surge tank disposed on the opposite side of a cylinder head of the engine with respect to the crankshaft of the engine; long intake pipes that communicate with the first surge tank and an intake port of the engine; second surge tanks disposed between the long intake pipes and the engine for communicating with the first surge tank; short intake pipes provided in the midway of the long intake pipes on the engine side for communicating with the second surge tanks; and on-off valves for opening and closing the short intake pipes.
Claims14
An outboard motor adapted to be mounted on a hull of a watercraft, the outboard motor including an engine generally enclosed within a cowling and having a crankshaft arranged to extend generally vertically when an attached watercraft hull is in a cruising condition, the outboard motor further comprising a first surge tank disposed on a side of the crankshaft generally opposite a head portion of the engine, a plurality of long intake conduits having first and second ends and extending between an engine intake port and the surge tank, a second surge tank disposed between the plurality of long intake conduits and the engine, the second surge tank communicating with the first surge tank, a plurality of short intake conduits, each of the short intake conduits provided between the first and second ends of a corresponding one of the long intake conduits and communicating with the second surge tank, and valves for selectively opening and closing the short intake conduits.
Dependencies are inferred from the claim text.