Girth Gears for Drum Drives

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. 

Typical geometry of a girth gear

 

Min.

Max.

Standard

Module

20

40

27

Pressure angle, [°]

  

24

Helix angle, [°]

0

45

0

Number of teeth:

   

• Girth Gear

100

300

 

• Pinion

18

30

 

Face Width, [mm]

100

500

 

Reference diameter, [mm]

2000

no limitation

 

Quality

ISO

AGMA

 

Girth Gear

8-10

9-7

 

Pinion

7

10

 

Calculation of tooth load carrying capacity is according to the following standards:

  • ANSI/AGMA 6004-F88 Gear power rating for cylindrical grinding mills, kilns, coolers and dryers
  • ISO 6336 Calculation of load capacity of spur and helical gears
  • DIN 3990 Calculation
  • of load capacity of cylindrical gears

Contact Sales Regarding Girth Gears for Drum Drives

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Gearboxes and Drives for Specific Applications

Kumera Girth Gears for Drum Drives. Kumera 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.