Catalogues - dr-gearmotor-catalog-2008

Catalogue DR Gearmotor Catalog 2008

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	Project Planning for Gear Units Service factor		5

Helical-worm For helical-worm pinion 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

-20 -K0^N 20 30 40 °C 50

Figure 4: Additional service factors f_B1 and f_B2

Time under load in min/h ^y ' 60 ¹

Contact SEW-EURODRIVE in case of temperatures below -20 °C (—f_B1).

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 geared motor.

Ambient temperature $ = 40°C — = 1.38 (read off at load classification II) Time under load = 40 min/h — cdf = 66.67% — f_B2 = 0.95 The total service factor is f_Bges = 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.

Catalog - DR Gearmotors 01/2008

EURODI