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Elongation Method
When the deflection force required for the Deflection 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 defined 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 12.
Enter the required strand installation tension per rib into the
formula, along with the Modulus Factor that corresponds to the
cross section of the Torque Team® belt to determine the Belt
Length Multiplier.
Multiply the gauge length by the Belt Length Multiplier to
determine the final gauge length at the installation tension.
Example:
A 5/5V1250 belt is to be installed at 1400 lb.
The Modulus Factor is 25622 lb./in./in. from Table 11.
The installation force is divided by the number of ribs in the
Torque Team® (1400/5 = 280 lb.).
The Belt Length Multiplier is calculated next.
Belt Length Multiplier = 1 + 280/25622 = 1.0109
Belt Length Multiplier = 1 +
Strand Tension per Rib
Modulus Factor
Table 11 Belt Deflection Force
Belt Deflection (force pounds)
Uncogged HY-T®
Wedge Belts
and Uncogged
HY-T® Wedge
Torque Team®
Cogged HY-T®
Wedge Belts
and HY-T® Wedge
Machine Edge
Torque Team®
Smallest Sheave
Diameter Range
RPM Range
Used
Belt
New
Belt
Used
Belt
New
Belt
3V, 3VX Cross Section
2.2-2.4
1000-2500
3.3 4.9
2501-4000
2.9 4.3
2.65-3.65
1000-2500 3.6 5.1
4.2 6.2
2501-4000 3.0 4.4
3.8 5.6
4.12-6.90
1000-2500 4.9 7.3
5.3 7.9
2501-4000 4.4 6.6
4.9 7.3
5V, 5VX Cross Section
4.4-6.7
500-1749
10.2 15.2
1750-3000
8.8 13.2
3001-4000
5.6 8.5
7.1-10.9
500-1740 12.7 18.9 14.8 22.1
1741-3000 11.2 16.7 13.7 20.1
11.8-16.0
500-1740 15.5 23.4 17.1 25.5
1741-3000 14.6 21.8 16.8 25.0
5VF Cross Section
7.1-10.9
200-700
21.1 30.9
701-1250 18.0 26.3
1251-1900 16.7 23.4
1901-3000 15.8 23.0
11.8-16.0
200-700
26.8 39.5
750-1250 23.5 34.7
1251-2100 22.7 33.3
8V Cross Section
12.5-17.0
200-850 33.0 49.3
851-1500 26.8 39.9
18.0-22.4
200-850 39.6 59.2
851-1500 35.3 52.7
8VF Cross Section
12.5-20.0
200-500 44.7 65.8
501-850
38.5 56.6
851-1150 35.2 51.6
1151-1650 33.5 49.0
21.2-25.0
200-500 65.9 97.6
501-850
61.2 90.6
851-1200 57.0 84.3
Torque Team
®
V-Belts
Installation Guide
Banded Belts
Installation Guide
Table 12 Modulus Factors
Cross
Section
3V,
3VX
5V,
5VX 5VF
8V 8VF
B,
BX
C,
CX D
Modulus
Factor
(lb./in.
/in.)
14270 25622 160025 55548 260040 28547 43440 58882
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