Motor vehicles – Special driving device – Portable track
Patent
1977-02-24
1978-06-06
Bertsch, Richard A.
Motor vehicles
Special driving device
Portable track
B62M 2702
Patent
active
040930335
ABSTRACT:
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 suspension 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.
REFERENCES:
patent: 3613811 (1971-10-01), Brandi et al.
patent: 3822755 (1974-07-01), Hine
patent: 3854541 (1974-12-01), Hollnagel
patent: 3885641 (1975-05-01), Harris
Bertsch Richard A.
Kawasaki Motors Corp. U.S.A.
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