A girth gear can be single or double pinion driven. Pinions are manufactured as a single part with an integrated shaft; however, the pinion can be separated and mounted on a separate shaft, supported by bearings, or, on the output shaft of the main gear unit.
The rotation speed of a drum normally varies between 0.5–20 rpm corresponding to the peripheral velocity from 0.3 to 10 m/s of the girth gear. The nominal power of a standard Kumera girth gear is up to 8 MW per mesh, i.e., 16 MW when double pinion driven.
Pressure angle, [°]
Helix angle, [°]
Number of teeth:
• Girth Gear
Face Width, [mm]
Reference diameter, [mm]
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