Gears
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Bajrang Engineering Works
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Bajrang Engineering Works

Girth Gears

Designing Buyer's Guide Maintenance

Designing Girth Gears
For designing Girth Gears and pinions, there are today several standards. The most common and popular standards are AGMA 321.05, AGMA 6004 F88 and ISO 6336. The two thing that forms the test of the Gear design are surface durability(pitting) and tooth bending strength. Both are tested by Hertzian fatigue stress and the Bending fatigue stress respectively. The image shows a very large Girth Gear that has a diameter of 8.8 meter used in a steel industry.

Buyer's consideration for Girth Gears
If you are opting for Girth gears for your production, the following points can prove to be very useful.

Path breaking Advancements in Girth Gear Materials
Recently there has been remarkable advancements made in the Girth Gear Material.
  • By using state-of-the-art full ring risering technology, castings are greatly enhanced
  • Newer researches in material development is allowing designers to take advantage of more hardness and, therefore, increased ratings.
  • Simulation programs are now used to verify proper solidification has taken place or not. Numerous examples are run for confirming that proper sizing of wedges, gates, and risers has been done. This has a remarkable effect on the casting quality, reduction in the foundry costs, and total elimination of casting failures.
  • Another feature has been added to the cap of the girth gear technology with the introduction of finite element analysis. With this technology, it is now possible to calculate not only the stresses in the structure of girth gear but the gear's deflection can also be analyzed. Accordingly modifications needed in the pinion tooth can then be ascertained.
Girth Gears
Other purchase Considerations
Besides the above general instructions some of the very important considerations with respect to the Gear and pinion of the Girth Gears are given in the following table.





Gears Pinions
Face and involute contact Face and involute contact
Surface finish Surface finish
Quality number Quality number
Chemical analysis Chemical analysis
Ultrasonic checks Ultrasonic checks
Magnetic particle checks Magnetic particle checks
BHN number BHN number
Case depth

Maintenance of Girth Gears
The specific methods of maintenance of these gears are as follows:






Effectively sums up all that is happening in the world of gears.

·Gear Blank
·Gear Cutting
·Gear Hobbing
·Heat Treatment of Gears