Bushing (isolator)

This movement allows the suspension parts to move freely, for example, when traveling over a large bump, while minimizing transmission of noise and small vibrations through to the chassis of the vehicle.

These bushings often take the form of an annular cylinder of flexible material inside a metallic casing or outer tube.

An important difference compared with plain bearings is that the relative motion between the two connected parts is accommodated by strain in the rubber, rather than by shear or friction at the interface.

Charles E. Sorensen credits Walter Chrysler as being a leader in encouraging the adoption of rubber vibration-isolating mounts.

Lee Iacocca credits Chrysler's chief of engineering during that era, Frederick Zeder, with leading the effort.