Gears pp 323-381 | Cite as

Scuffing Load Carrying Capacity of Cylindrical, Bevel and Hypoid Gears: Flash Temperature Method

  • Vincenzo VulloEmail author
Part of the Springer Series in Solid and Structural Mechanics book series (SSSSM, volume 11)


In this chapter, the basic concepts of the scuffing damage of the gears are first described, framing the calculation of scuffing load carrying capacity of cylindrical, bevel and hypoid gears according to the flask temperature method. The fundamentals of the Blok’s theory that ascribes the cause of scuffing to a sudden breakdown of the lubricant oil film are recalled, also lingering on the transition diagrams in lubricated contacts and on the coefficient of friction at incipient scuffing. The flash temperature is then determined for the aforementioned gears, showing how it strongly depends on the coefficient of friction and other influence factors described in detail. The contact temperature and scuffing temperature are therefore defined and indications are given on the safety factor for scuffing. A large part of the chapter is reserved for the procedures to calculate the tooth bending strength of these types of gears in accordance with the ISO standards, highlighting when deemed necessary as the relationships used by the same ISO are founded on the theoretical bases previously recalled. Finally, indications are given on cold scuffing, with insights on the proper scuffing (warm scuffing) and references to empirical formulae used in this regard in the recent past.


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Authors and Affiliations

  1. 1.University of Rome “Tor Vergata”RomeItaly

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