T–8
SECTION 4 DRIVE COMPARATIVE STUDIES
The development of the PowerGrip GT2 belt has produced an impressive range of enhanced
properties and subsequent design opportunities for engineers.
Comparative studies, shown in Figures 7 through 10, allow designers to make quantitative
assessments and to highlight the most significant improvements and design opportunities. Particularly
significant points from the comparative studies follow:
4.1 Durability
The greatly increased durability of the PowerGrip GT2 design has resulted in power capacities
far above those quoted for similar size belts of previous designs. The resulting small drive packages
will increase design flexibility, space utilization and cost effectiveness.
4.2 Tooth Jump Resistance
The very significant improvement in tooth jump resistance of PowerGrip GT2 when compared
to similar belts has several important advantages.
1. Ratcheting resistance during high start-up torques.
2. Reduced bearing loads, particularly in fixed-center drives. Lower average tensions can be
used without encountering tooth jump at the low tension end of the tolerance ranges.
3. Reduced system losses result from lower pre-tensioning, with less potential for tooth
jumping.
Test Stopped –––3
Fig. 7 Comparison of Performance Ratios for Various Belts
Fig. 8 Comparison of Tooth Jump Torques for Various Belts
3 mm HTD Versus 3 mm PowerGrip
GT2
3 mm HTD
3 mm GT2
TEST CONDITIONS: Speed = 6000 rpm
Power = 1.00 lb×in/mm width
Pulleys: Driver = 20 grooves
Driven = 20 grooves
Test Stopped –––3
5 mm HTD Versus 5 mm PowerGrip
GT2
5 mm HTD
5mm GT2
TEST CONDITIONS: Speed = 2300 rpm
Power = 3.35 lb×in/mm width
Pulleys: Driver = 20 grooves
Driven = 20 grooves
200
150
100
50
0
200
150
100
50
0
10
8
6
4
2
0
1
2
3
4
5
2 mm GT2
MXL
2 mm PowerGrip GT2 Versus MXL
3 mm PowerGrip GT2 Versus 3 mm HTD
5 mm PowerGrip GT2 Versus 5 mm HTD
5 mm GT2
5 mm HTD
3 mm GT2
3 mm HTD
60
50
40
30
20
10
0
450
375
300
225
150
75
0
2
4
6
8
10
15
30
45
60
75
Installed Tension (lb)
TEST CONDITIONS:
Speed = 1130 rpm
Belt Width = 4.8 mm
Pulleys: Driver = 20 grooves
Driven = 20 grooves
Installed Tension (lb)
TEST CONDITIONS:
Speed = 750 rpm
Belt Width = 6 mm
Pulleys: Driver = 30 grooves
Driven = 30 grooves
Installed Tension (lb)
TEST CONDITIONS:
Speed = 2300 rpm
Belt Width = 15 mm
Pulleys: Driver = 20 grooves
Driven = 20 grooves
