Claims
- 1. 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.
- 2. The outboard motor as set forth in claim 1, wherein the engine defines a lubricant passage through which lubricant flows, the lubricant passage communicating with the reservoir so that the lubricant accumulates within the reservoir.
- 3. The outboard motor as set forth in claim 1 additionally comprising an exhaust conduit extending generally vertically, the exhaust conduit defining at least a portion of the second exhaust passage, the exhaust gases descending the exhaust conduit during operation of the engine.
- 4. The outboard motor as set forth in claim 3, wherein the internal exhaust conduit extends generally vertically.
- 5. The outboard motor as set forth in claim 3, wherein the lubricant reservoir generally surrounds the exhaust conduit.
- 6. The outboard motor as set forth in claim 1, wherein the lubricant reservoir generally surrounds at least a portion of the second exhaust passage.
- 7. The outboard motor as set forth in claim 1, wherein the housing unit has a coolant pool, the second exhaust passage comprises an expansion chamber, an upper surface of the expansion chamber is defined by a lower surface of the coolant pool.
- 8. The outboard motor as set forth in claim 1 additionally comprising a cooling system defining at least one coolant jacket, the coolant jacket defining a pool of coolant, the coolant jacket surrounds a portion of the second exhaust passage.
- 9. The outboard motor as set forth in claim 1, wherein the first exhaust discharge port is configured to be in a submerged position when the outboard motor is in a normal upright position and mounted to a watercraft floating in water.
- 10. The outboard motor as set forth in claim 1, wherein the second exhaust passage comprises at least two expansion chambers.
- 11. The outboard motor as set forth in claim 1 additionally comprising a coolant passage that extends next to a vertically extending portion of the second exhaust passage.
- 12. The outboard motor as set forth in claim 11, wherein the coolant passage is in the thermal communication with the vertically extending portion of the second exhaust passage.
- 13. 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.
- 14. The outboard motor as set forth in claim 13 additionally comprising an exhaust conduit extending generally vertically along the lubricant reservoir member, the exhaust conduit defining at least a portion of the third exhaust passage, the exhaust gases descending through the exhaust conduit.
- 15. The outboard motor as set forth in claim 14, wherein the portion of the second exhaust passage formed in the lubricant reservoir member extends generally vertically.
- 16. The outboard motor as set forth in claim 14, wherein the lubricant reservoir member generally surrounds the exhaust conduit.
- 17. The outboard motor as set forth in claim 13, wherein the portion of the second exhaust passage extends generally vertically.
- 18. The outboard motor as set forth in claim 13, wherein the fourth exhaust passage expands greater than the second exhaust passage.
- 19. The outboard motor as set forth in claim 13, wherein the lubricant reservoir member defines a coolant passage next to the portion of the second exhaust passage, coolant flowing through the coolant passage.
- 20. 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.
- 21. The outboard motor as set forth in claim 20, wherein the container generally surrounds the exhaust conduit.
- 22. The outboard motor as set forth in claim 20, wherein the container contains lubricant.
- 23. The outboard motor as set forth in claim 20, wherein the internal exhaust conduit extends generally vertically, the exhaust gases ascending the internal exhaust conduit from the inlet to the outlet.
- 24. The outboard motor as set forth in claim 20, wherein the fourth exhaust passage expands greater than the third exhaust passage.
- 25. The outboard motor as set forth in claim 20, wherein the container defines a coolant passage next to the internal exhaust conduit, coolant flowing through the coolant passage.
- 26. The outboard motor as set forth in claim 1, wherein the internal exhaust conduit extends generally vertically, and the third passage is arranged such that exhaust gases ascend through the internal exhaust conduit under at least some operating conditions of the engine.
- 27. The outboard motor as set forth in claim 1, wherein the second exhaust discharge port is configured to communicate with the atmosphere when the outboard motor is in a normal upright position and is mounted to a watercraft floating in water.
- 28. The outboard motor as set forth in claim 13, wherein the housing unit additionally has a fifth exhaust passage, the fifth exhaust passage is arranged between the third exhaust passage and a second exhaust discharge port that communicates with another external location.
- 29. The outboard motor as set forth in claim 13, wherein the inlet is disposed generally at a bottom of the lubricant reservoir member.
- 30. 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.
- 31. The outboard motor as set forth in claim 30, wherein the exhaust passage has at least first and second exhaust discharge ports, the first discharge port is disposed higher than the second discharge port, and the first portion of the exhaust passage defined by the internal exhaust conduit communicates with the first discharge port.
- 32. The outboard motor as set forth in claim 30, wherein the outlet is arranged such that exhaust gases ascend the internal exhaust conduit from the inlet to the outlet under at least some operating conditions of the engine.
- 33. The outboard motor as set forth in claim 30 additionally comprising 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.
- 34. The outboard motor as set forth in claim 33, wherein the housing unit has a third portion of the exhaust passage extending below the second portion of the exhaust passage defined by the exhaust conduit, the third portion of the exhaust passage communicates with the second portion of the exhaust passage, and the third portion of the exhaust passage is isolated from the lubricant reservoir member.
- 35. The outboard motor as set forth in claim 34 additionally comprising 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.
- 36. The outboard motor as set forth in claim 35, wherein the first portion of the exhaust passage communicates with the third portion of the exhaust passage through the partition.
- 37. The outboard motor as set forth in claim 33, wherein the exhaust conduit is disposed within the outboard motor such that exhaust gases descend through the exhaust conduit under at least some operating conditions of the engine.
- 38. The outboard motor as set forth in claim 33, wherein the lubricant reservoir member generally surrounds the exhaust conduit.
- 39. The outboard motor as set forth in claim 30, wherein the inlet is disposed generally at a bottom of the lubricant reservoir member.
- 40. 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.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-186411 |
Jun 2001 |
JP |
|
PRIORITY INFORMATION
This application is based on and claims priority to Japanese Patent Application No. 2001-186411, filed Jun. 20, 2001, the entire contents of which is hereby expressly incorporated by reference.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
8-100625 |
Apr 1996 |
JP |