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US 5,957,230 AGranted
Cooling system for snowmobile engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTomoki Harano, Masanobu Yamamoto, Toyochika Eto
Life of this patent
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTomoki Harano, Masanobu Yamamoto, Toyochika Eto
Estimating the term…
A snowmobile having a lightweight fabricated frame assembly. The frame assembly includes a number of reinforcing elements, some of which comprise heat exchangers for the liquid cooling system of the engine, so as to provide high rigidity and light weight. The engine of the snowmobile is provided with an exhaust system that permits a relatively short effective length, but minimizes pulse-back effects by forming internal expansion chambers around the exhaust branch pipes. The drive for the snowmobile includes a reversing transmission and a brake assembly associated therewith in addition to a main brake assembly for the snowmobile. Furthermore, there is provided a parking brake assembly that is easy to operate and which will provide the operator with a visual and physical warning of its condition so that the operator will not attempt to operate the snowmobile with the parking brake engaged.
A snowmobile comprised of a frame assembly, a liquid cooled internal combustion engine supported at the front of said frame assembly, a drive belt disposed beneath said frame assembly to the rear of said engine and supported for suspension movement relative to said frame assembly, a seat mounted on said frame assembly above said drive belt, a pair of foot areas formed by said frame assembly on opposite sides of said seat, a front heat exchanger extending transversely across said frame assembly at the front of said drive belt, a pair of side heat exchangers each extending along a lower horizontal surface of a respective one of said foot areas, a rear heat exchanger extending transversely across said frame assembly at the rear of said drive belt, and means for circulating liquid coolant through a cooling jacket of said engine and through said heat exchangers, said side heat exchangers being integrally connected around the outer periphery of said side heat exchangers to said frame assembly for reinforcing said frame assembly, at least one of said front and said rear heat exchangers being integrally connected around the outer periphery of said at least one heat exchanger to said frame assembly for reinforcing said frame assembly.
Dependencies are inferred from the claim text.