Nonlinear Dynamics of Spiral Bevel Gear: Axial Bearing Stiffness Effect

The dynamic responses of power transmission systems have always been a major concern in gear design. This study examined the effects of changing the axial stiffness of the bearings on the vibration of spiral bevel gears (SBGs). SBGs are essential for transmitting power between intersecting shafts especially when it comes to high level of torque or speed. In helicopters transmission systems, to transmit the engine’s power to the blads and tail, SBG is mainly used due to smooth motion at low level of noise compared with straight bevel gear. In this model, an eight-translational-rotational DOF lumped model is considered. The time-varying mesh stiffness and piecewise linear backlash function is considered during forward and reverse directions of motion. Results indicate that the axial stiffness of the pinion and gear significantly affects the system’s responses.