The double-wishbone suspension design was introduced by the Packard Motor Company in 1935. Double-wishbone suspension has been around for awhile, but the later versions have seen the most improvements. Double-wishbone suspension incorporates two wishbone-shaped arms, also called A-arms, placed in parallel on each side of the axle for each wheel. One end of the wishbone arm connects two joints to the chassis, while the other single joint connects at the steering knuckle, or wheel pivot point. A coil spring and shock mounts to the wishbone arms, to control vertical movement. Double-wishbone suspension allows independent wheel travel in several smaller axis, and depending upon the design, a vehicle owner can discover how this unique suspension works and how it is applied to modern vehicles.
Coil Spring Type 1 Wishbone
Coil spring type 1 wishbone suspension uses two A-arms stacked over each other. The arms are sometimes designated as upper and lower control arms. The base of the A-arms have two connection joints each, which mount to the vehicle chassis.