Anti-Compliance Mechanism for Twistbeams - Force Vectoring Springs

Paper #:
  • 2017-01-1573

Published:
  • 2017-03-28
Abstract:
A twistbeam is a very cost effective rear suspension architecture which has drawbacks compared to an independent suspension. One drawback is the lateral compliance during cornering compromising handling. Common solutions to correct this issue are complex reinforcements or an additional Watts linkage. However, these solutions drive high cost and additional weight. The challenge was to find a cost efficient solution which comes close to the functional performance of an IRS. Due to the attachment by bushings, the set-up of a twistbeam is always a compromise between ride comfort and dynamic lag. The more comfort is desired, the softer the bushings will be, resulting in less agility and slower response. The goal was to determine a way to separate ride comfort and dynamic agility. A solution was found using a special set of springs working as a dynamic anti-compliance mechanism. The springs are designed in a way, that they create a lateral force component by their coil shape without major spring seat modifications. Changes between conventional springs and the so called “force vectoring springs” are very simple and cost effective. This creates high modularity between each variant.
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