Due to the lower dynamic load, the noise level during the operation in smaller automotive transmissions, helical gears have become the subject of attention. This paper explains about the comparison of the geometry of helical gears for two different modules and materials by modeling and mathematical equations, and the contact analysis of Helical gears using three-dimensional finite element method. The contact stresses were examined using three-dimensional finite element model. These stresses of different modules for different materials obtained from the finite element analysis were compared with the theoretical values. Both results agree very well. This indicates that the finite element method model is accurate.
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