Page 232 - Industrial Power Engineering and Applications Handbook

Transmission of load and suitability of bearings 8/21 1

Table 8.6 Correction factors for belt pitch length
Correction factor Belt pitch length
Belt cross-sections

Z mm A mrn B rnm C mm D mrn EllUll
0.80 630
0.81 930
0.82 700 1560 2740
0.83 1000
0.84 790 1760
0.85 1100
0.86 405 890 3130
0.87 1210 1950 3330
0.88 990
0.89
0.90 475 1100 1370 2190 3730 4660
0.91 2340
0.92 530 1560 2490 4080 5040
0.93 1250
0.94 2720 4620 5420
0.95 625 1760 2800
0.96 1430 3080 6100
0.97 1950 5400
0.98 700 1550 3310
0.99 1640 2180 3520 6850
1 .oo 780 1750 2300 6100
1.02 1940 2500 4060 7650
1.03 6840
1.04 920 2050 2700
1.05 2200 2850 4600 7620 9150
1.06 2300
1.07 1080 8410 9950
1.08 2480 3200 5380
1.09 2570 9140 10710
1.10 2700 3600
1.11 6100
1.12 2910 10700 12230
1.13 3080 4060
1.14 3290 6860 13750
1.15 4430
1.16 3540 4820 7600 12200
1.17 5000 13700 15280
1.18 5370
1.19 6070 15200 16800
1.20 9100
1.21 10700

8.6 Checking the suitability of transmitted through belts. In such cases it is of the utmost
bearings importance to check the suitability of the bearing and
the motor shaft to transmit the required load under such
conditions.
8.6.1 Forces acting on the DE motor bearing We provide below a few guidelines for checking the
suitability of the bearing and the motor shaft, when
When transmitting the load to the driven equipment, the selecting a motor for these drives:
motor bearing at the driving end (DE) is normally subject
to two types of forces, radial and axial. The axial force Radial forces
in a horizontal drive is normally zero. If it is not zero The radial forces acting on the bearing can be deter-
this may be due to eccentricity in the transmitting line or mined by the belt pull and is expressed by
any such reason that may subject the driving end bearing
to an axial load in addition to a radial load. These forces P, = K. 973 . kW wkg (8.3)
D
become severe when the load from the motor is being N, .-
2