Which design feature increases the durability of gear teeth against wear?

The feature that significantly increases the durability of gear teeth against wear is the addition of hunting teeth. Hunting tooth design involves incorporating a few extra teeth in the gear, which helps in distributing the load over a larger area during operation. This leads to a reduction in localized stress on individual teeth, thereby diminishing wear over time. Additionally, with the implementation of hunting teeth, the engagement of meshing teeth becomes less constant, reducing the chances of repeated impact on the same portion of the gear teeth, which further enhances longevity.

This method not only improves the durability by minimizing the stress concentration points but also contributes to smoother operation and reduced noise levels in the gear. The combination of these factors helps mitigate the effects of wear, thereby extending the overall life of the gear system.