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
Calculation of tooth load carrying
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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.
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