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The research into the stress state of gear rim has been based on the developed model of pinion-wheel system and the finite element application. For a spur gear structure of middle web position, the assumption of load distribution in the contact area that reflects, first of all, the tooth support deformation, has been not required for the imposed boundary conditions. To study the influence of web thickness stiffening effect on the inner rim surface stress, the ranges of rim and web thickness values have been considered. The area of stress along the rim circle and tooth facewidth has been shaped and discussed in relation to maximum rim stress appearance.

The paper presents a study on the tooth root, rim and web stresses of thin-rimmed spur gear structure with symmetrical web, based upon 3D FEM calculations. In order to identify some gear design directions, the effects of rim and web thickness on gear stress behaviour are investigated, and maximum stresses resulting from actual rim and web contribution are compared.

The paper deals with the discussion how nominal spur tooth root stress of thin-rimmed gear determined in accordance with the standard ISO 6336-3:2006, method B, agrees with the results of the 3D FEM stress analysis. The procedure proposed by standard ISO for the tooth root stress calculation doesn’t identify the stress behaviour related to mutual affects of characteristic thin-rimmed gear geometrical parameters. Therefore, the 3D FEM analysis of tooth root stress has been performed for gear structures with middle and offset web with various rim and web thickness. The rim thickness has covered and slightly overcome the backup ratio defined by ISO procedure, while the web thickness has covered the range of practical interest.

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