Field of Research
Tooth Flank Carrying Capacity

 

Tooth Flank Carrying Capacity

Acc. to DIN 3979, the four relevant damage types of gears are root breakage, pitting, scuffing and abrasive wear. Furthermore, grey-staining and flank breakage gain in importance with respect to gear damages. Flank damages are affected by classic wear mechanisms like material fatigue, abrasion, adhesion and tribochemical reactions that appear due to energetic (cracks, material wear) and material interactions (chemical bonds) in tribological contacts. In current gear designs surface fatigue (pitting, grey-staining) and adhesion (scuffing) often determine the lifetime of gears.

The Gear Investigation Group deals with the flank strength of gears as a main issue of activities concerning public founded and bilaterally performed research projects. Currently, one major research focus is the development and verfication of theoretic models for the calculation of local surface fatigue strength on the flank. Furthermore, WZL runs several test rigs like back-to-back test rigs with two-shaft-principle to evaluate the influence of e.g. surface finishing, material, heat treatment on the surface strength. Also standardized oil tests (e.g. scuffing test acc. to ISO 16435, grey-staining test acc. to FVA 54, pitting test acc. to FVA 2) are performed reproducably on these test rigs. Back-to-back test rigs with two-shaft principle have fixed center distances of a = 91,5 mm or a = 112,5 mm. Hence, WZL runs back-to-back test rigs with three-shaft-principle and variable center distance. This allows the testing of gears used in real applications. For the economic, qualitative investigation of the load carrying capacity of loaded surfaces, several two-disk test rigs are available at WZL.

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