THE PREDICTION OF THE INSTANTANEOUS MESH STIFFNESS OF SPUR GEARS AND THE INFLUENCE OF MISALIGNMENT ERRORS AND LONGITUDINAL TOOTH CORRECTIONS

M. MAATAR*+¤, S. ZOUARI*, C. KARRA*+ *Laboratory of Electro-Mechanical Systems (LASEM) ENIS Sfax Tunisia +Preparatory Institute of Engineers’ Studies of Sfax, BP 805 3018 Sfax Tunisia Tel: +216 74 241 403 Fax:+216 246 347 E-mail: Mohamed.maatar@ipeis.rnu.tn, Chafik.karra@ipeis.rnu.tn, ¤ Corresponding author: maatar2005@yahoo.fr or Mohamed.maatar@ipeis.rnu.tn

ABSTRACT The magnitude and the vibration of gear mesh stiffness affect tooth loading and gear dynamics significantly. In fact, the variation of mesh stiffness is considered as an important source of excitation for gear systems. This paper describes the use of a 3D finite element model for the prediction of instantaneous mesh stiffness of a spur gear and for the analysis of the stress distributions at the tooth root for misaligned gears. This paper also discusses the use of longitudinal corrections (parabolic crowning) for the improvement of stress distributions at tooth root for misaligned gears. The described method and the corresponding results present a contribution for the improvement of existing calculations in gear dynamic excitations.

 

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