TrailBlazer 4WD V8-6.0L (2007)
Suspension Spring ( Coil / Leaf ): Description and Operation
General Description (Coil Spring)
The front suspension has 2 primary purposes:
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Isolate the driver from irregularities in the road surface.
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Define the ride and handling characteristics of the vehicle.
The front suspension absorbs the impact of the tires travelling over irregular road surfaces and dissipates this energy throughout the suspension system.
This process isolates the vehicle occupants from the road surface. The rate at which the suspension dissipates the energy and the amount of energy that is
absorbed is how the suspension defines the vehicle's ride characteristics. Ride characteristics are designed into the suspension system and are not
adjustable. The ride characteristics are mentioned in this description in order to aid in the understanding of the functions of the suspension system. The
suspension system must allow for the vertical movement of the tire and wheel assembly as the vehicle travels over irregular road surfaces while
maintaining the tire's horizontal relationship to the road.
This requires that the steering knuckle be suspended between an upper and a lower control arm. The lower control arm attaches from the steering
Knuckle at the outermost point of the control arm. The attachment is through a ball and socket type joint. The innermost end of the control arm attached
at 2 points to the vehicle frame, through semi-rigid bushings. The upper control arm attaches to the frame in the same fashion. Between the lower control
arm and a spring seat on the vehicle's frame, under tension, is a coil spring.
This up and down motion of the steering knuckle as the vehicle travels over bumps is absorbed predominantly by the coil spring. The vertical movement
of the steering knuckle as the vehicle travels over irregular road surfaces will tend to compress the spring and spring tension will lead the spring to return
to the original, at-rest state. This action isolates the vehicle from the road surface. The upper and lower control arms are allowed to pivot at the vehicle
frame in a vertical fashion. The ball joint allows the steering knuckle to maintain the perpendicular relationship to the road surface.
A shock absorber is used in conjunction with this system in order to dampen out the oscillations of the coil spring. A shock absorber is a basic hydraulic
cylinder. The shock is filled with oil and has a moveable shaft that connects to a piston inside the shock absorber. Valves inside the shock absorber offer
resistance to oil flow and consequently inhibit rapid movement of the piston and shaft. Each end of the shock absorber is connected in such a fashion to
utilize this recoil action of a spring alone.
Front suspensions systems utilize a stabilizer shaft. The stabilizer bar connects between the left and right lower control arm assemblies through the
stabilizer link and stabilizer shaft insulators. This bar controls the amount of independent movement of the suspension when the vehicle turns. Limiting
the independent movement defines the vehicle's handling characteristics on turns.
