12
INTRODUCTION TO BALANCING
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.
COUPLE
FORCE
LIMIT
COUPLE FORCE
GRAPH DISPLAY
COUPLE
FORCE
Figure 23.
FRONT VIEW
ZERO STATIC IMBALANCE
WITH LARGE COUPLE IMBALANCE
IMBALANCE
WOBBLE
(LATERAL TWIST
OR TORQUE)
Figure 24.
Modern “dynamic” balancers spin the wheel in order to
measure both the up and down static imbalance force
and couple wobble or shimmy related imbalance (side-to-
side).
A statically imbalanced tire driven for an extended period
may cause “cupping” in the tire’s tread, create vibration,
and adversely effect handling.
STATIC IMBALANCE
FRONT VIEW
IMBALANCE
FORCE
Figure 21.
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.
BALANCE WEIGHT IS NOT IN
CENTER OF WHEEL
NON-RECOMMENDED FORM OF
STATIC BALANCING
Figure 22.
Balancing Theory - Couple Imbalance
Dynamic imbalance is defined as a condition where one
or more locations of the tire/wheel assembly are heavier
causing an imbalance force and/or an imbalance shake
and wobble. Shown below is a tire/wheel assembly
with two heavy spots of equal weight which are located
180 degrees 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
Содержание GSP9200 Touch
Страница 2: ......
Страница 6: ...THIS PAGE INTENTIONALLY LEFT BLANK iv ...
Страница 26: ...THIS PAGE INTENTIONALLY LEFT BLANK 18 INTRODUCTION TO BALANCING ...
Страница 87: ...THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 88: ...www Hunter com ...