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Which motion does a leaf spring permit that produces axle wind-up?

  • A.Vertical deflection
  • B.Torsional deflection of the leaves about their own axis, which permits the axle to rotate within the spring seat
  • C.S-shaped deflection of the spring under torque
  • D.Lateral deflection of the spring, which allows the axle to move sideways and therefore to lose its alignment

Answer: C

Drive torque winds the front half of the spring one way and the rear half the other, letting the axle rotate and then snap back. That cycle is axle tramp. Traction bars and multi-leaf stiffening both resist it. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape.

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