IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0014062
(2001-12-10)
|
우선권정보 |
JP-0374894 (2000-12-08) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Yamaha Hatsudoki Kabushiki Kaisha
|
대리인 / 주소 |
Knobbe Martens Olson & Bear LLP
|
인용정보 |
피인용 횟수 :
12 인용 특허 :
13 |
초록
A snowmobile has a frame construction that defines a recess above a drive unit. The recess is formed by a horizontal member and a pair of vertical members. A portion of the exhaust system extends within the recess at a location above the drive unit.
대표청구항
▼
1. A snowmobile comprising: a frame assembly comprising an inverted generally U-shaped portion that extends at least partially beneath a seat of the snowmobile; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted genera
1. A snowmobile comprising: a frame assembly comprising an inverted generally U-shaped portion that extends at least partially beneath a seat of the snowmobile; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted generally U-shaped portion; an exhaust system connected to said engine and extending rearward of said engine in a region defined directly between a bight of said inverted generally U-shaped portion and a generally laterally extending surface of said drive belt. 2. The snowmobile of claim 1, wherein said engine comprises a transversely extending crankshaft and at least one cylinder that is inclined in a rearward direction. 3. The snowmobile of claim 2, wherein said engine further comprises at least one exhaust discharge pipe that extends to a rearward direction. 4. The snowmobile of claim 1, wherein said frame assembly comprises a front portion and a rear portion, said front portion at least partially defining an engine compartment and wherein said exhaust system comprises first pipe and a second pipe, said first pipe and said second pipe being connected together in said engine compartment. 5. The snowmobile of claim 4, wherein said first pipe and said second pipe are connected with a flexible coupling member. 6. The snowmobile of claim 1, wherein said engine comprises at least two cylinders, said exhaust system comprises at least two conduits that are in communication with said at least two cylinders, and a majority of said at least two conduits are disposed within said region defined between said bight of said inverted generally U-shaped portion and said drive belt. 7. The snowmobile of claim 6, wherein an area between said two conduits of said exhaust system and said drive belt is substantially unobstructed. 8. The snowmobile of claim 1, wherein said seat comprising a sitting portion that is configured to accommodate a rider and said exhaust system comprising a silencer box, and said silencer box comprising a rear portion that is disposed rearward of said sitting portion. 9. The snowmobile of claim 8 further comprising a tailpipe extending rearward of said silencer box and terminating forward of a grab bar that is connected to said frame assembly. 10. The snowmobile of claim 1, wherein said inverted generally U-shaped portion comprises a deck member and a pair of side members, said deck member and said pair of side members having a pair of overlapping corners. 11. A snowmobile comprising: a frame assembly comprising an inverted generally U-shaped portion that extends at least partially beneath a seat of the snowmobile; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted generally U-shaped portion; an exhaust system connected to said engine and extending rearward of said engine in a region defined between a bight of said inverted generally U-shaped portion and a generally laterally extending surface of said drive belt, wherein said generally U-shaped portion comprises a deck and said deck comprises an upwardly embossed portion that extends in a longitudinal direction and wherein said exhaust system comprises an exhaust conduit that comprises at least a portion that extends rearward of said engine within said embossed portion. 12. The snowmobile of claim 11, wherein said seat is disposed over said embossed portion. 13. The snowmobile of claim 12, wherein said seat comprises a bottom plate and a resilient cushion member that is mounted to said bottom plate and wherein said bottom plate spans a width of said embossed portion that is transverse to said longitudinal direction. 14. The snowmobile of claim 12, wherein said seat comprises a bottom plate and a resilient cushion member that is mounted to said bottom plate and wherein said bottom plate spans a width of said embossed portion that is transverse to said longitudinal direction. 15. A snowmobile compri sing: a frame assembly comprising an inverted generally U-shaped portion that extends at least partially beneath a seat of the snowmobile; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted generally U-shaped portion; an exhaust system connected to said engine and extending rearward of said engine in a region defined between a bight of said inverted generally U-shaped portion and a generally laterally extending surface of said drive belt, wherein said bight of said inverted generally U-shaped portion comprises an upwardly embossed generally horizontal wall portion that defines a recess below said wall portion and said exhaust system comprises a first exhaust conduit extending rearward from a first cylinder and a second exhaust conduit extending rearward from a second cylinder, said first and second exhaust conduits merging together into a single pipe within said recess. 16. The snowmobile of claim 15, wherein said single pipe also extends rearward to a silencer box. 17. A snowmobile comprising a frame assembly, said frame assembly comprising a front portion and a rear portion that are joined together, said rear portion comprising three walls that combine to form an inverted U-shaped member that extends under at least a portion of a seat of the snowmobile, said front portion defining an engine compartment, an engine disposed within said engine compartment, said engine powering a drive track, said drive track extending below at least a portion of said inverted U-shaped member, an exhaust system coupled to said engine and defining a discharge path for exhaust gases generated in said engine, and said exhaust system comprising an exhaust conduit that extends directly between an inner surface of said inverted U-shaped member and said drive track, said exhaust conduit extending through a region defined generally above said drive track. 18. The snowmobile of claim 17, wherein said exhaust system is coupled to said engine with an flexible member that is disposed within said engine compartment. 19. The snowmobile of claim 18, wherein said engine is transversely disposed. 20. The snowmobile of claim 19, wherein said engine comprises a combustion chamber and an exhaust port that extends from said combustion chamber in a rearward direction. 21. The snowmobile of claim 20, wherein said engine comprises an inline four cylinder engine. 22. The snowmobile of claim 17 further comprising a silencer box that is in communication with said exhaust conduit, at least a portion of said silencer box extending beneath a portion of said seat. 23. The snowmobile of claim 22, wherein said silencer box comprises a rear portion and said seat comprises a sitting portion that accommodates a rider, said rear portion of said silencer box being disposed rearward of said sitting portion. 24. The snowmobile of claim 22 further comprising a grab bar that extends rearward of said seat and at least one exhaust discharge pipe that extends from said silencer box, said exhaust discharge pipe being disposed completely forward of a grabbing portion of said grab bar. 25. The snowmobile of claim 24, wherein said discharge pipe extends upwardly and rearwardly from said silencer box. 26. The snowmobile of claim 24, wherein said discharge pipe extends downwardly from said silencer box. 27. The snowmobile of claim 26, wherein said snowmobile comprises a flap that hangs downward generally rearward of said drive track and said discharge pipe terminates forward of said flap. 28. A snowmobile comprising a frame assembly, said frame assembly comprising a front portion and a rear portion that are joined together, said rear portion comprising three walls that combine to form an inverted U-shaped member that extends under at least a portion of a seat of the snowmobile, said front portion defining an engine compartment, an engine disposed within said engine compartment, said engine powering a drive track, said drive track extending below at least a portion of said inverted U-shaped member, an exhaust system coupled to said engine and defining a discharge path for exhaust gases generated in said engine, and said exhaust system comprising an exhaust conduit that extends between an inner surface of said inverted U-shaped member and said drive track, said exhaust conduit extending through a region defined generally above said drive track, wherein said inner surface defines a generally horizontal plane and said inner surface also comprises an upwardly offset portion and wherein said exhaust conduit extends within said offset portion. 29. The snowmobile of claim 28, wherein said exhaust system comprises at least two conduits that merge together at a merge location positioned within said offset portion. 30. The snowmobile of claim 29, wherein said exhaust system further comprises an exhaust pipe that extends rearward of said merge location within said offset portion. 31. The snowmobile of claim 29, said seat is disposed over said offset portion. 32. The snowmobile of claim 31, wherein said seat comprises a bottom plate member that spans a width of said offset portion. 33. A snowmobile comprising: a frame assembly comprising an inverted generally U-shaped portion, said generally U-shaped portion comprising a deck, said deck comprising an upwardly embossed portion that extends in a longitudinal direction; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted generally U-shaped portion; an exhaust system connected to said engine and comprising an exhaust conduit, at least a portion of said exhaust conduit extending rearward of said engine in a region within said embossed portion at a location defined between a bight of said inverted generally U-shaped portion and said drive belt. 34. The snowmobile of claim 33 further comprising a seat that is disposed over said embossed portion. 35. A snowmobile comprising: a frame assembly comprising an inverted generally U-shaped portion; an engine mounted to said frame assembly; a drive belt powered by said engine and disposed at least partially within said inverted generally U-shaped portion; an exhaust system connected to said engine and extending rearward of said engine in a region defined between a bight of said inverted generally U-shaped portion and said drive belt, said bight of said inverted generally U-shaped portion comprising an upwardly embossed generally horizontal wall portion that defines a recess below said wall portion and said exhaust system comprises a first exhaust conduit extending rearward from a first cylinder and a second exhaust conduit extending rearward from a second cylinder, said first and second exhaust conduits merging together into a single pipe within said recess. 36. The snowmobile of claim 35, wherein said single pipe also extends rearward to a silencer box. 37. A snowmobile comprising a frame assembly, said frame assembly comprising a front portion and a rear portion that are joined together, said rear portion comprising three walls that combine to form an inverted U-shaped member, said front portion defining an engine compartment, an engine disposed within said engine compartment, said engine powering a drive track, said drive track extending below at least a portion of said inverted U-shaped member, an exhaust system coupled to said engine and defining a discharge path for exhaust gases generated in said engine, and said exhaust system comprising an exhaust conduit that extends between an inner surface of said inverted U-shaped member and said drive track, said inner surface defining a generally horizontal plane and said inner surface also comprising an upwardly offset portion and said exhaust conduit extending within said offset portion. 38. The snowmobile of claim 37, wherein said exhaust system comprises at least two conduits that merge together at a merge location positioned within said offset portion. 39. The snowmobile of claim 38, wherein said exhaust system further comprises an exhaust pipe that extends rearward of said merge location within said offset portion. 40. The snowmobile of claim 38 further comprising a seat that is disposed over said offset portion. 41. The snowmobile of claim 40, wherein said seat comprises a bottom plate member that spans a width of said offset portion.
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