General information

The efficiency of the gear units is mainly determined by the gearing and bearing friction as well as by churning losses. Keep in mind that the starting efficiency of a gear unit is always less than its efficiency at operating speed. This is particularly pronounced with SPIROPLAN^® right-angle gear units of the W..0 series and with helical-worm gear units.

For information on churning losses and thermal rating, refer to chapter Churning losses and thermal rating.