Snowmobile suspension system

Details Snowmobile suspension system Snowmobile suspension system

B - Operations, Transporting

62

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305/46

B62D 55/00 (2006.01) B62D 55/07 (2006.01) B62D 55/108 (2006.01) B62M 27/02 (2006.01)

Patent

CA 1091279

SNOWMOBILE SUSPENSION SYSTEM ABSTRACT OF THE DISCLOSURE A suspension system for a track driven vehicle such as a snowmobile, comprising a generally rectangular rigid suspension frame having longitudinal rails slidably supported on the inner surface of the track, and front and rear suspension assemblies for resiliently supporting the vehicle body. The front support assembly includes a weldment pivotally attached at its rear end to the frame its front end being resiliently biased upwardly to support the body The rear suspension assembly includes a transverse shaft carried by the body and a centrally disposed longitudinal compression spring for resiliently biasing the shaft upwardly relative to the suspen- sion frame through a linkage effectively providing an increasing spring rate as the parts approach maximum excursion. The linkage includes pivotal components whose pivotal axes form a triangle which flattens as the body is displaced downwardly, and the change of altitude of the triangle is vectorially added to the component of the frame movement compressing the spring. The rate of that change increases rapidly as the parts approach maximum excursion. -1-

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