Abstract
This paper presents a study on the effect of extra face width on root and contact stresses of spur and helical gear pairs. The root and contact stresses of spur and helical gear pairs, in which extra face width is not in contact, were calculated using Kubo and Umezawa's method. The validity of the calculation method was confirmed by comparing the calculated root stresses of spur gear pairs with extra face width with measured ones. The effect of the extra face width on the root and contact stresses of spur and helical gear pairs were determined to a considerable extent. The changes of maximum root and contact stresses of the gear pairs with extra face width were found to be fairly small.
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