Abstract
This paper presents a study on the effects of rim and web thicknesses on bending fatigue strength of internal gears. A stress analysis by means of the 3-dimensional finite element method (FEM) and a static loading test for internal gears of different rim and web thicknesses were carried out and the effects of rim and web thicknesses on the root, rim and web stresses of internal gears were clarified. A bending fatigue test for thin-rimmed internal gears with a thin web was carried out and the effects of rim and web thicknesses on the bending fatigue strength were investigated. Furthermore the validity of the calculating formula of tooth bending strength of internal gear proposed by ISO was examined.
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