During the last years the load capacity of worm gears was raisedabout 30%. The reasons for this are the introduction of syntheticoiis, optimization of the worm gear geometry and manufacturingimprovements. The forthcoming new standard DIN 3996 “Caldation ofload capacity of cylindrical worm gear pairs” takes into accountthese developments. This standard contains the following loadcapacily limits: wear, pitting, tooth breakage, temperature andworm deflection. Also, efficiency was taken into consideration. Inmost cases the calculation methods are based on resuits of tecentinvestigations, which wen performed on worm gear test rigs at theFZG. In the case of wear, pitting and tooth breakage test resultsand their influence on DIN 3996 are shown.
The caldation method for wear resistance is based on the factthat the wear intensity of a materiaulubricant combination is afunction of the lubricant fiim îhicknes and the lubricantstructure. The main influence parameter on pitting resistance isthe Hertzian stress. For tooth root strength the caldation methodis based on a nominal shear stress theory, in case of wormdeflection on the deflection curve of a cylindrical shaft.
The appiicaticm of this new standard for gears in practice isdiscussed by recaicuiating some examples.
- Edition:
- 96
- Published:
- 10/01/1996
- Number of Pages:
- 16
- File Size:
- 1 file , 1 MB
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