Abstract
The load capacity calculation of worm gear has been improved by the development of the new technical report ISO TR 14521 under the control of the ISO TC60/SC1/WG7. New rating criterions are proposed. The author provides the analyses of the actual TR improvements and gives the limits of application based on several examples. On the bases of experiments realised on test rigs and in order to improve the future of the worm gear load capacity calculation methods the author analyses the fact that the contact pressure is in general non uniform along the lines of contact in opposition to the bases of the TR which supposes a constant contact pressure. On the basis of the non uniform contact pressure, the author proposed a calculation method that can be easily adapted on a PC. At least an adaptation of the TR is proposed.
