Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1995-04-21
1997-11-11
Hurley, Kevin
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180376, B62M 2702
Patent
active
056853874
ABSTRACT:
This invention relates to an improved snowmobile drive train configuration arrangement that incorporates a fixed ratio speed reduction mechanism directly coupled to the engine crankshaft. This mechanism is in turn coupled to the driving pulley of a variable ratio belt drive system, the driven pulley of which is mounted on the axle of the sprocket wheels that drive the snowmobile track. Interposing the reduction drive between the engine and the belt drive system reduces the operational speed of both the pulleys and the belt, which proves beneficial from several aspects: the mechanical efficiency of the global system is increased, the dynamic response of the transmission to throttle modulation is improved; aerodynamic losses are reduced; the bending vibrations of the crankshaft are no longer transmitted to the drive clutch; and the engine can be run at higher RPM without decreasing the efficiency of the belt drive system.
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Bostelmann Willy
Cote Raymond
Fecteau Berthold
Gagne Yvon
Pesant Gilles
Bombardier Inc.
Hurley Kevin
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