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Title of the article ASSESSMENT OF DEPTH CONTACT ENDURANCE OF SURFACE-HARDENED GEARS
Authors

RUDENKO Sergei P., Ph. D. in Eng., Assoc. Prof., Leading Researcher of the Laboratory of Metallurgy in Mechanical Engineering of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

VALKO Aleksandr L., Senior Researcher of the Laboratory of Metallurgy in Mechanical Engineering of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">valсThis email address is being protected from spambots. You need JavaScript enabled to view it.

SANDOMIRSKI Sergei G., D. Sc. in Eng., Assoc. Prof., Head of Laboratory Metallurgy in Mechanical Engineering of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2025
Issue 2(71)
Pages 22–28
Type of article RAR
Index UDK 620.178.1
DOI https://doi.org/10.46864/1995-0470-2025-2-71-22-28
Abstract The main factors determining the performance of highly stressed surface-hardened gears of transmissions of energy-consuming machines are the parameters of a hardened layer, especially the behavior of hardness distribution over its thickness. The existing analytical dependences have been analyzed for hardness distribution over the thickness of the diffusion layer of surface-hardened parts, used for determining the depth contact endurance of cylindric gears. It is noted that the approximating dependence given in the works of V.I. Korotkin corresponds more accurately to the experimental data than that given in GOST 21354-87. The results of calculation of surface-hardened gears are given for deep contact endurance with regard to this dependence on the basis of determination of equivalent stresses according to the Gest–Mohr strength theory. The comparison of the obtained calculation results with the data of bench tests of gears of different sizes made of different steel grades has been carried out. It has been established that for all variants of the tested gears deep contact pitting is observed only in one zone of the hardened layer — the zone of maximum equivalent stresses. It is concluded that it is sufficient to estimate the resistance to deep contact fatigue of surface-hardened gears by the depth of occurrence of maximum equivalent stresses equal to the half-width of the contact area. It is noted that the application of V.I. Korotkin’s method developed on the basis of the generalized Lebedev–Pisarenko criterion for structurally inhomogeneous material to assess the depth contact fatigue resistance of involute gears requires further research.
Keywords gears, diffusion layers, hardness distribution, deep contact fatigue, lifetime calculation
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