S-gears are relatively new type of gear that was first introduced by prof. dr. Hlebanja. Compared to involute gears, which are broadly used in the industry, S-gears have many advantages, such as smaller specific slip while running and favorable concave-convex contact, resulting in lower flank stress. The shape of the tooth flank for S-gears is determined by shape parameter n, thus the use of calculation according to the standard is not possible. Stress calculations for S-gears so far have been carried out with the use of finite element method, which is a time-consuming process, and it requires use of a payable program. That is why our goal was to develop a simplified method, which would allow us to evaluate tooth root and flank stress in polymer gears. First, we created surface models of gears with different values of parameters n and for different number of teeth. Created surface models were then imported into the finite element calculation program, where we performed calculation of tooth root and tooth flank stress. At the development of the simplified method, we proceeded from the equations from VDI 2736. Our result are graphs that represent coefficients for different shapes of tooth flanks, with which we can evaluate internal stress in S-gears.
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