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| | | | | | | | | | | Project Planning for Gear Units Service factor | | 5 | | | | | | | | | | | | | | | | |
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| | | 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 | | |
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| | | 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. | | |
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| | | fBi ■ 1.81.6 | | |
| | | (I) (II) (III) | | |
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| | | fB2 1.0 | | |
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| | | 1.4- | | |
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| | | 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 | | |
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| | | 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). | | |
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| | | 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. | | |
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| | | 45 | | |
| | | Catalog - DR Gearmotors 01/2008 | | |
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| | | EURODI | | |
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