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US 6,746,290 B2Granted
Idle exhaust system for outboard motor
AssigneeYamaha Marine Kabushiki Kaisha
InventorsJun Nakata, Toshiaki Sato
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AssigneeYamaha Marine Kabushiki Kaisha
InventorsJun Nakata, Toshiaki Sato
Estimating the term…
An outboard motor includes a housing unit and an engine disposed above the housing unit. The engine defines a first exhaust passage to discharge exhaust gases from the engine and a lubricant passage through which lubricant flows. A lubricant reservoir member is disposed below the engine within the housing unit to define a lubricant reservoir therein. The lubricant passage communicates with the lubricant reservoir. A second exhaust passage, which can be defined on an outer surface of the lubricant reservoir member, extends along the height of the lubricant reservoir. The housing unit defines third and fourth exhaust passages. The third exhaust passage is arranged between the first and second exhaust passages. The fourth exhaust passage is arranged downstream of the second exhaust passage. The housing unit defines an exhaust discharge port at an end of the fourth exhaust passage. The exhaust discharge port communicates with the atmosphere.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed above the housing unit, the engine having a first exhaust passage to discharge exhaust gases from the engine, and a lubricant reservoir disposed below the engine, the housing unit having a second exhaust passage that communicates with the first exhaust passage and extends below the lubricant reservoir, the second exhaust passage extending to a first exhaust discharge port that communicates with an external location, the housing unit having a third exhaust passage, the lubricant reservoir having at least one wall extending generally vertically, the wall having an internal exhaust conduit that defines at least a portion of the third exhaust passage, the third exhaust passage having an inlet that communicates with the second exhaust passage at a point below the lubricant reservoir, the third exhaust passage extending upwardly to a point at about the same elevation as an upper end of the lubricant reservoir, and the third exhaust passage extending to a second exhaust discharge port that communicates with another external location and is disposed higher than the first exhaust discharge port.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed above the housing unit, the engine having a first exhaust passage to discharge exhaust gases from the engine, the engine additionally having a lubricant passage through which lubricant flows, and a lubricant reservoir member disposed below the engine within the housing unit to define a lubricant reservoir therein, the lubricant passage communicating with the lubricant reservoir, the lubricant reservoir member having a wall that has an internal exhaust conduit that defines at least a portion of a second exhaust passage, the portion of the second exhaust passage having an inlet and an outlet disposed higher than the inlet, the housing unit having third and fourth exhaust passages, the third exhaust passage being arranged between the first and second exhaust passages, the fourth exhaust passage being arranged downstream of the second exhaust passage, the housing unit having an exhaust discharge port at an end of the fourth exhaust passage, and the exhaust discharge port communicating with an external location.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed above the housing unit, the engine having a first exhaust passage to discharge exhaust gases from the engine, an exhaust conduit extending generally vertically within the housing unit, the exhaust conduit defining a portion of a second exhaust passage that communicates with the first exhaust passage such that the exhaust gases descend through the exhaust conduit, and a container disposed below the engine within the housing unit, a wall of the container having an internal exhaust conduit that defines at least a portion of a third exhaust passage, the third exhaust passage communicating with the second exhaust passage, the internal exhaust conduit having an inlet positioned generally at a bottom of the container and an outlet positioned higher than the inlet, the housing unit defining a fourth exhaust passage that communicates with the third exhaust passage and has an exhaust discharge port disposed at an end of the fourth exhaust passage, and the exhaust discharge port communicating with an external location.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed above the housing unit, the housing unit having an exhaust passage through which exhaust gases from the engine are discharged to an external location, and a lubricant reservoir member disposed below the engine within the housing unit to define a lubricant reservoir, the lubricant reservoir member having a wall that extends generally vertically, the wall having an internal exhaust conduit that defines at least a first portion of the exhaust passage, and the internal exhaust conduit having an inlet and an outlet, the outlet being disposed higher than the inlet.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed above the housing unit, the housing unit having an exhaust passage through which exhaust gases from the engine are discharged to an external location, and a lubricant reservoir member disposed below the engine within the housing unit to define a lubricant reservoir, the lubricant reservoir member having a wall that extends generally vertically, the wall forming an opening that defines at least a first portion of the exhaust passage, and the opening having an inlet and an outlet, the outlet being disposed higher than the inlet, an exhaust conduit extending from the engine to a location below the lubricant reservoir member, the exhaust conduit defining a second portion of the exhaust passage, the first portion of the exhaust passage communicating with the second portion of the exhaust passage, the housing unit containing a third portion of the exhaust passage that extends below the second portion of the exhaust passage defined by the exhaust conduit, the third portion of the exhaust passage communicating with the second portion of the exhaust passage, the housing unit also containing a partition through which a portion of the exhaust conduit extends, the partition separating the third portion of the exhaust passage from the lubricant reservoir member to isolate the third portion of the exhaust passage from the lubricant reservoir member, the housing unit and the partition defining at least in part a coolant pool between the lubricant reservoir member and the partition.
Dependencies are inferred from the claim text.