SIMULATION STUDY OF THE INFLUENCE OF INVOLUTE TIP RELIEF ON GEAR DYNAMIC BEHAVIOUR

Abstract

The tooth tip relief, as an intended departure from the normal involute profile is a common technics for the improvement of tooth contact characteristics. It is often used not only for avoiding tip contact, but especially in the case of long relief, to aim at better dynamic behaviour. For studying the dynamic characteristics of gear trains in the case of long relief, comparative computer simulations were carried out for a train with normal toothing and with tooth tip relief. The applied dynamical model and excitation characteristics are discussed. By simulating smooth acceleration processes at different nominal load conditions, resonance curves are generated and analysed in the case of ideal tooth geometry under real mesh conditions, i.e. the mesh irregularities at the beginning and points of contact, due to tooth deflections were taken into account. Dynamic behaviour at low specific load level is studied based on steady state rolling down simulations and resonance characteristics are discussed.