Snowmobile exhaust system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorShinichi Nishijima
Life of this patent
Estimating the term…
Abstract
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.
Claims41
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.
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.
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 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.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.