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US 6,634,913 B2Granted
Cooling arrangement for outboard motor
AssigneeYamaha Marine Kabushiki Kaisha
InventorsYasuhiko Shibata, Takaji Kawai, Koichi Isozaki
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AssigneeYamaha Marine Kabushiki Kaisha
InventorsYasuhiko Shibata, Takaji Kawai, Koichi Isozaki
Estimating the term…
An outboard motor includes a housing unit and an engine. The engine defines a first exhaust passage and a first lubricant passage. The first exhaust passage generally extends on a first side of the outboard motor. The first lubricant passage generally extends on a second side of the outboard motor opposite to the first side. An exhaust guide member is coupled with the housing unit to support the engine above the housing unit. An exhaust conduit depends from the exhaust guide member within the housing unit. The exhaust guide member defines a second exhaust passage connecting the exhaust conduit with the first exhaust passage. The second exhaust passage generally extends on the first side. A lubricant reservoir depends from the exhaust guide member within the housing unit. The exhaust guide member defines a second lubricant passage connecting the lubricant reservoir with the first lubricant passage. The second lubricant passage generally extends on the second side. The engine and the exhaust guide member together define a first water passage extending in the vicinity of the first and second exhaust passages. The engine defines a second coolant passage extending from the first coolant passage toward a location in the vicinity of the first lubricant passage.
An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine defining a first exhaust passage and a first lubricant passage, the first exhaust passage generally extending on a first side of the outboard motor, the first lubricant passage generally extending on a second side of the outboard motor opposite to the first side, a support member coupled with the housing unit to support the engine above the housing unit, an exhaust conduit depending from the support member within the housing unit, the support member defining a second exhaust passage connecting the exhaust conduit with the first exhaust passage, the second exhaust passage generally extending on the first side, and a lubricant reservoir depending from the support member within the housing unit, the support member defining a second lubricant passage connecting the lubricant reservoir with the first lubricant passage, the second lubricant passage generally extending on the second side, the engine and the support member together defining a first coolant passage extending in the vicinity of the first and second exhaust passages, either the engine or the support member defining a second coolant passage extending from the first coolant passage toward a location in the vicinity of either the first or second lubricant passage.
An outboard motor comprising a bracket assembly adapted to be mounted on an associated watercraft, and a drive unit supported by the bracket assembly for tilt movement about a generally horizontally extending tilt axis and for steering movement about a generally vertically extending steering axis, the drive unit comprising an internal combustion engine disposed atop thereof, an exhaust system arranged to discharge exhaust gases from the engine, the exhaust system at least in part generally disposed on a first side of the drive unit, and a coolant delivery system arranged to cool either the engine or the exhaust system, the coolant delivery system at least in part generally disposed on the first side of the drive unit, the coolant delivery system including a coolant passage extending toward a second side of the drive unit opposite to the first side, and the coolant passage extending generally horizontally and parallel to the tilt axis.
An outboard motor comprising a bracket assembly adapted to be mounted on an associated watercraft, and a drive unit supported by the bracket assembly, the drive unit comprising an internal combustion engine disposed atop thereof, the engine including at least one cylinder having a generally horizontally extending axis, an exhaust system arranged to discharge exhaust gases from the engine, the exhaust system at least in part generally disposed on a first side of the drive unit, and a coolant delivery system arranged to cool either the engine or the exhaust system, the coolant delivery system at least in part generally disposed on the first side of the drive unit, the coolant delivery system including a coolant passage extending to a second side of the drive unit opposite to the first side, and the coolant passage extending generally horizontally and normal to the axis of the cylinder.
Dependencies are inferred from the claim text.