Design and Analysis of Dual Worm Self Locking System

Self-locking gears prevent back driving and inertial driving, and they may find applications in a wide variety of industries. In load lifting devices it is necessary to use a pair of two identical or different parts for the motion transmission. Mostly the pairs used are worm-gear, belt-pulley, chain-pulley etc. The selection of appropriate pair depends on parameters such as space requirement, type of load to be handled, desired efficiency of the system. In Most of the cases the worm-gear pair is used because of higher efficiency, compactness and simple construction. It also exhibits the self-locking ability. self-locking also useful for safety of machine operators and prevent probable accidents due to falling of lifted load when power is off. In this self-locking system Left Hand(LH) Worm and Right Hand(RH) Worm are used for self-locking and model of LH and RH Worm are created in Unigraphix Nx-8.0 and imported in Ansys Workbench for analysis. Values of vonmises stress and theoretical stress are compared for safe design.