Run-in phase
The tooth flanks of new helical-worm and SPIROPLAN® gear units of the W..0 series are not yet completely smooth. This makes for a greater friction angle and less efficiency during the run-in phase than during later operation. This effect intensifies with increasing gear ratio.
During the running-in phase, the nominal efficiency of the gear unit is reduced by the respective value in the following tables.
| Worm | |
|---|---|---|
i range | η reduction | |
1-start | approx. 50 – 280 | approx. 12% |
2-start | approx. 20 – 75 | approx. 6% |
3-start | approx. 20 – 90 | approx. 3% |
5-start | approx. 6 – 25 | approx. 3% |
6-start | approx. 7 – 25 | approx. 2% |
SPIROPLAN® W..10 to W..30 | |
i range | η reduction |
approx. 35 – 75 | approx. 15% |
approx. 20 – 35 | approx. 10% |
approx. 10 – 20 | approx. 8% |
approx. 8 | approx. 5% |
approx. 6 | approx. 3% |
The run-in phase usually lasts 48 hours. Helical-worm gear units achieve their nominal efficiency values when the following conditions have been met:
- The gear unit has been completely run-in.
- The gear unit has reached nominal operating temperature.
- The recommended lubricant has been filled.
- The gear unit is operating in the nominal load range.
