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2015 Power Transmission Products
General Information
158
2.
Place the belt on each sprocket and ensure proper
engagement between the sprocket and belt teeth.
3.
Lengthen the center distance or adjust the tensioning idler to
remove any belt slack.
4.
Using a tape measure, measure the span length of the drive.
Refer to dimension “P” in the diagram. The span length can be
calculated using the formula at the right.
5.
Place a straightedge or reference line across the top of
the belt.
6.
Determine the proper deflection force to tension the belt.
Deflection forces are given in the following tables. Deflection
forces are also given on the output of the MaximizerPro™
computer drive analysis.
a.
If using a tension gauge, the deflection scale is calibrated in
inches of span length. Check the force required to deflect the
belt the proper amount. There is an O-ring to help record the
force. If the measured force is less than the required deflection
force, lengthen the center distance. If the measured force is
greater than the required deflection force, shorten the center
distance. See chart on page 157 for deflection values and
tension gauges available.
b.
If using other means to apply force to the belt, adjust the
center distance so that the belt is deflected 1⁄64 per inch of
span length when the proper force is applied. See chart on
page 158 regarding TensionRite® Belt Frequency Meter which
calculates belt tension by measuring span vibrations.
7.
After the belt is properly tensioned, lock down the center
distance adjustments and recheck the sprocket alignment.
8.
If possible, run the drive for approximately 5 minutes with or
without load. Stop the drive and lock out the power source and
examine alignment, capscrew torque and belt tension. Adjust
the center distance to increase the belt tension to the “New”
value in the Deflection Principle table below. Lock down the
drive adjustments and recheck tension.
9.
Recheck the belt tension, alignment and capscrew torque
after 8 hours of operation to ensure the drive has not shifted.
Deflection Principle
F =
Deflection Force
q =
Deflection, 1⁄64 in. per in. of span length
C =
Center Distance
D =
Large Sprocket Pitch Diameter
d =
Small Sprocket Pitch Diameter
P =
Span Length
Pitch Length
Range (mm)
Allowance (decrease)
for Installation
Allowance
(increase)
for Take-Up
8m Belts
(mm/in.)
14m Belts
(mm/in.)
8m, 14m Belts
(mm/in.)
Less than 1525
10.1/0.4
15.2/0.6
2.5/0.1
Greater than 1525 15.2/0.6
17.8/0.7
5.0/0.2
P = C
2
-
(
)
2
D-d
2
Overview
Synchronous
Banded
V-Belt
Bushing Hardware
Specialty
Automotive & Truck
General Information