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    A new method for preventing premature pitting formation on spur gears
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Duezcuekoglu, Hayrettin; Imrek, Hueseyin
    Surface pitting of gear teeth flanks is one of the most common causes of operational failure of gears. Pitting is strongly influenced by the Hertzian stress. The Hertzian surface stress is at a maximum in the single tooth contact region. Decreasing the Hertzian surface stress in this region decreases pitting. Another way to decrease the stress in this region is to modify the tooth width. The aim of this study is to delay the formation of pitting in the single tooth meshing region by means of decreasing the Hertzian surface pressure by increasing tooth width. Experiments show that pitting appearance is delayed for the width-modified gear wheels with respect to the gears having no such modifications. (C) 2008 Elsevier Ltd. All rights reserved.
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    Performance improvement method for Nylon 6 spur gears
    (ELSEVIER SCI LTD, 2009) Imrek, Hueseyin
    Plastic gears made of Nylon 6 are especially susceptible to failure due to extreme heat accumulation in the single tooth mesh area, which results in damage that consequently shortens gear teeth life and causes transmission errors. In this experimental study, the teeth width of plastic spur gears made of Nylon 6 were modified and investigated. The values of load sharing, F/b, in single and double tooth meshing areas were leveled by widening the single tooth zone along the meshing area, and the performances of both modifled and unmodified gears were studied experimentaily under three different loadings. It was observed that modified Nylon 6 gears exhibit lower tooth temperatures, which results in a decrease in wear rate as compared to unmodified gears. Consequently, teeth width modification helps to increase Nylon 6 gear performance. (c) 2008 Published by Elsevier Ltd.