As simple as it gets -- actually in use on large trucks...
Popular Science ( June 1926 )
A Springless Suspension for Motor Cars
For a long time automobile designers have been working to improve spring suspension, trying especially to get rid of wearing parts. Walter L Adams, of new Haven CT, now claims to have solved the problem by eliminating springs altogether and substituting disks of rubber, in a unique invention of his.
In place of springs, he has devised a strong pressed-steel cantilever arm and having a drum at the other end. The inner face of this drum has teeth radiating from the center. A strong steel disk, also made with teeth, is bolted to the side rail of the chassis. A bolt runs through the axis of the disk and drum, and between the two is placed a rubber ring-shaped cushion with teeth that fit in those of the disk and drum.
When the car hits a bump, the rubber cushion is squeezed outward just as a rubber band would be stretched. No lubrication is needed.
Suspension for Automobiles
[ PDF ]
USP # 1,515,716
Inventor: ADAMS WALTER L
Applicant: ADAMS MOTORS CORP
Classification: - international: B60G13/04; B60G13/00; - European: B60G13/04
Also published as: GB236243 (A) // DE428971 (C1)