(Work in progress)

Goal: Conduct research and compile detailed information on the design of double-wishbone suspension systems.

Contents:

1.0 System Description

The double-wishbone suspension system is an independent type suspension (wheels behave independently of each other)
Generally, independent systems allow for more comfortable rides but can be more expensive to manufacture

1.1 Components

Consist of 2 equal-sized wishbone-shaped members/arms positioned one over the other
closed ends are hinge-mounted to the top and bottom of the vehicle knuckle to provide steering
Vehicle knuckle supports spindle/hub that the wheel is mounted to
Open ends of wishbone are hinge-mounted to chassis
pivot/hinge connections allow the wheel to move up and down
in drive-wheel application, a coil spring is seated in the central position of the upper arm and extends up to chassis member support (upper arm supports most of the vertical load)
in non-drive application, a coil spring is seated in the central portion of LCA and extends up to a chassis member support (The lower arm supports most of the load)

Pros	Cons

Pros	Cons
camber, caster and toe angle can be closely controlled/adjusted with double-wishbone suspension the system is perpendicular to the ground so the camber is kept constant/neutral which reduces tire wear and scrubbing	system is more complex and thus more expensive wishbones are intricately shaped 6 attachment points can be heavier

modification of double wishbone
- in double wishbone, the two arms are the same length
- in SLA, the upper arm is shorter than the lower arm
can be used on front and rear wheels
benefits
- this variation helps control camber and limit tire edge wear when cornering
- the shorter upper arm allows tires to maintain good contact with the road in cornering conditions (good for performance vehicles)
  - when cornering, centrifugal forces put tires on their edges and could cause the vehicle to roll – this suspension system acts to move contact of wheels back to the centre of tires for both wheels
  - this effect takes place all the way to full jounce making it an ideal suspension for performance vehicles