If the different rating methods usually used for designing worm gears ([1],[8] a [10]) consider their limited life because of TEETH BREA-KAGE and CONTACT PRESSURES, experience shows that in most cases, it is the SURFACE DEGRADATIONS OF THE WORMWHEEL which limit the gearing life.
The main cause for SURFACE DEGRADATION is the fatigue phenomenon on the material layer submitted to CONTACT PRESSU-RES. This has brought us to develop a method of calculation allowing to evaluate the level and distribution of contact pressures along the flanks of the teeth.
As opposed to existing methods of calculations, the distribution of contact pressures is no longer supposed to be uniform.
The development that follows presents the method basis used as well as a simplified method which can easily be applied industrially either for verifying or design.
AGMA 90FTM2-1990 pdf download
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