16 2. Balancing Overview GSP9700 Series Road Force Measurement System Operation
Static balancing alone is a seldom-recommended procedure. For example, a single
weight is commonly placed on the inner clip weight position for cosmetic purposes.
This is not a recommended practice and usually insures the assembly is not properly
dynamically balanced. The assembly may then experience side-to-side imbalance
while in motion, causing a shimmy condition and objectionable vibration.
Couple Imbalance
In general terms, dynamic imbalance is defined as where one or more locations of
the tire/wheel assembly are heavier causing an imbalance force and/or an imbalance
wobble. Shown below is a tire/wheel assembly with two heavy spots of equal weight
which are located 180 degrees radially from each other on opposite sides. As this
assembly rotates, centrifugal forces cause a large imbalance wobble to be created,
but the imbalance force (as well as the static imbalance) will be zero. A wheel with
this condition will cause a wobble or shimmy to be felt in the steering wheel.
Excessive dynamic imbalance of this type creates a shimmy that transfers through
the suspension components to the occupants of the vehicle, especially at higher
speeds.
IMBALANCE WOBBLE
(LATERAL TWIST OR TORQUE)
FRONT VIEW
ZERO STATIC IMBALANCE WITH LARGE
COUPLE IMBALANCE
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