PD ISO/TS 14521:2020 PDF

What is ISO 14521 about?

ISO 14521 specifies formulae for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered by ISO 14521 . The load rating and design procedures are only valid for tooth surface sliding velocities, v g , less than or equal to 25 m/s and contact ratios greater than 2,1. For wear, load rating and design procedures are only valid for tooth surface sliding velocities that are above 0,1 m/s. The rules and recommendations for the dimensioning, lubricants or materials selected by ISO 14521 only apply to centre distances of 50 mm and larger. For centre distances below 50 mm, method A applies. The choice of appropriate methods of calculation requires knowledge and experience. ISO 14521