DR Gearmotor Catalog 2008 - SEW-EURODRIVE - #45

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Text version of the page
Project Planning for Gear Units
Service factor
5
Helical-worm For helical-worm gear units, two additional service factors will have to be taken into con-
gear units sideration besides service factor fB derived from Figure 3 . These are:
•fB1 = Service factor from ambient temperature
•fB2 = Service factor from cyclic duration factor
The additional service factors and can be determined by referring to the diagrams in Figure 4 . For , the load classification is taken into account in the same way as for
fB.
fBi ■ 1.8­1.6­
(I) (II) (III)
fB2
1.0
1.4-
1.0H-1-rft-i-r^H-1-1-1-1—► 0.6
80 100 %ED 00657BXX
60
-20 -K0N 20 30 40 °C 50
20
40
Figure 4: Additional service factors fB1 and fB2
Time under load in min/h y ' 60 1
Contact SEW-EURODRIVE in case of temperatures below -20 °C (—fB1).
The total service factor for helical-worm gear units is calculated as follows:
Example The gearmotor with the service factor fB = 1.51 in the previous example is to be a helical-
worm gearmotor.
Ambient temperature $ = 40°C — = 1.38 (read off at load classification II) Time under load = 40 min/h — cdf = 66.67% — fB2 = 0.95 The total service factor is fBges = 1.51 • 1.38 • 0.95 = 1.98
According to the selection tables, the selected helical-worm gearmotor must have an SEW fB service factor of 1.98 or greater.
45
Catalog - DR Gearmotors 01/2008
EURODI

pageCatalog pdf di En 2012-05-22-31