Abstract
In this chapter, a general survey is first done on the surface durability (pitting ) of spur and helical gears, also focusing attention on pitting damage and safety factor to be used in their design. The theoretical bases of surface durability are then discussed, with particular reference to the surface and subsurface stress states that occur in sliding and rolling contacts between the mating surfaces of the conjugate flanks of the teeth in relative motion. In this framework, same brief reminder on the elastohydrodynamic lubrication theory is provided, also describing the great influence it exerts on the aforementioned contacts as well as the EDH lubrication conditions necessary to reduce or avoid surface and subsurface fatigue damages in these types of gears. Finally, the procedure for calculating the surface durability of these same gears in accordance with the ISO standards is described, highlighting when deemed necessary as the relationships used by the same ISO are anchored to the theoretical base previously discussed.
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Vullo, V. (2020). Surface Durability (Pitting) of Spur and Helical Gears. In: Gears. Springer Series in Solid and Structural Mechanics, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-030-38632-0_2
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