Snowmobile track suspension

Details Snowmobile track suspension Snowmobile track suspension

2008-07-08

2008-07-08

Morris, Lesley D. (Department: 3611)

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

C180S190000, C180S186000, C180S009500, C180S009520, C180S009540

Reexamination Certificate

active

11329281

ABSTRACT:
A rear track suspension for a snowmobile having a single resilient element for biasing both the front and rear arms. The slide rail is permitted to pitch between first and second pitching constraints in response to terrain obstacles in a gradual manner as the motion constraints are approached. This reduces jarring of the rider when the pitching constraints are met. Suspension compression exhibits an initial falling rate motion ratio, followed by a constant rate motion ratio, followed by a rising rate motion ratio. This U-shaped motion ratio profile advantageously provides cushioning upon landing along with a resistance to bottoming out of the suspension upon full compression. The result is an improved ride without sacrificing suspension performance.

REFERENCES:
patent: 4826260 (1989-05-01), Plourde
patent: 5904216 (1999-05-01), Furusawa
patent: 6234264 (2001-05-01), Boivin et al.
patent: 6390219 (2002-05-01), Vaisanen
patent: 6991057 (2006-01-01), Imamura et al.
patent: 2004/0159483 (2004-08-01), Imamura et al.

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