Page 18 - Goodyear2011PTMaintenanceManual

18
Torque Team ® V-Belt
INSTALLATION GUIDE
Elongation Method
When the defection force required for the Defection Method
becomes impractical for large Torque Team belts, use the
elongation method.
Imagine the Torque Team® belt as a very stiff spring, where a
known amount of tension results in a known amount of elongation.
The modulus of the Torque Team® belt is like the spring constant
of a spring and is used to relate the elongation to the tension in the
belt. The Elongation Method calculates the belt length associated
with the required installation tension.
A gauge length is defned and used as a point of reference for
measuring belt elongation. The gauge length could be the outside
circumference of the belt or the span (or part of the span) length.
The initial gauge length is measured with no belt tension.
The relationship between belt elongation and strand tension for
one rib in a Torque Team® Belt can be found by using the formula
below, where the Modulus Factors are given in Table 11.
Measure the span length.
Mark the center of the span. At the center mark, use a tension
tester and apply a force perpendicular to the span large enough to
defect the belt 1/64" for every inch of span length (Ex: a 100" span
requires a defection of 100/64" or 1 9/16").
Compare the actual defection force with the values in Tables
9 and 10. A force below the target value indicates under-tension. A
force above the target indicates over-tension.
TABLE 9 - BELT DEFLECTION FORCE
TABLE 10 - BELT DEFLECTION FORCE
TABLE 11
Strand Tension per rib
Modulus Factor
1 + Belt Length Multiplier =