| 摘要 |
A suspension system for a track driven vehicle such as a snowmobile, which has a vehicle body and a rigid frame, the suspension system pivotally interconnecting the body with the frame and comprising spaced front and rear support frames. The front support frame carries front torsion spring members having spring arms extending longitudinally along the rigid frame, each front torsion spring means having a spring arm engaging a cam surface on the rigid frame to vary the effective length of the torsion spring arm, the torsion spring arm being engageable with a cam edge of selected configuration to provide a desired progressive spring rate response to vertical displacement of the vehicle body with respect to the rigid frame. The rear support frame similarly includes torsion spring members each having spring arms for engagement with cam surfaces carried by the rigid frame to vary the effective length of the spring arm, the spring arm being engageable with a cam edge of selected configuration to provide a progressive spring rate during vertical displacement of the vehicle body with respect to the rigid frame. The rear support frame is pivotally connected to the rigid frame through side link members, one end of each link member having a pivotal connection with the rigid frame and the other end of each link member having a pivotal connection to a transverse member of the rear support frame. This transverse member is provided at a transverse axis of a bell crank lever system comprising a crank arm which is pivotally interconnected to a piston-cylinder shock absorber means carried by the rigid frame. The axis of the lower transverse member of the rear support frame is movable in an arc determined by the side links connecting the axis to the rigid frame and provides a movable, floating axis for the rear support frame to not only increase vertical displacement of the vehicle body but to also facilitate a selected progressive spring rate in the resilient suspension of the rear support frame.
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