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Information about value and distribution law of stresses along tooth root of gears allows one to estimate loading capacity and durability of gear transmissions in real operation conditions. The paper considers new original means for determination of stresses in tooth roots – Integral Strain Gauges. Results of stress determination in roots of straight teeth of satellites of planetary gears are presented. Authors have established that use of satellites with longitudinal modification of teeth allows reducing the stress concentration by 20%. The sensitivity of gearings to relative location errors of gears in accordance with the value and stress distribution law in tooth roots was researched during stand operations of NovikoffWildhaber's gearing with two contact lines and cylindrical gearings with arch-shaped teeth with use of Integral Strain Gauges. The possibility of experimental research of loading capacity of gear transmissions in operational conditions with the gauges is shown by the example of estimation of stress distribution in tooth roots of sun pinion of a planetary reducer of the tractor. Keywords—durability, stress distribution, operational conditions, gearing, Integral Strain Gauges, cyclic deforming

Determination of stresses in tooth roots of gears by Integral Strain Gauges