Dynamic contact loads of spur and helical gears
1996
Gear noise excitation is mainly caused by impacts and frictional forces during the tooth contact. In order to reduce such effects, profile modifications with a static approach are generally used. Simulations, which also consider dynamical phenomenas at the tooth contact could be used for a later 'dynamical profile modification'. The model uses the exact positions of the contact points. In this way frictional forces appear, which excite vibrations in the gears through time-variant torques. A single-stage transmission consists of a pinion and a gear in the plane, which each possess two translational and one rotational degree of freedom. The exact geometry of the teeth is considered for kinematic, dynamic and elastic effects. Bearing forces and normal forces at the tooth contact are used in addition to the drive train torques. Active external forces appear as frictional forces between the tooth flanks. Spring-damper-elements with backlash are laid into the contact zone, whereas the influence of the oil is considered by an exponential oil-law. The non-linear differential equations show unsteadinesses due to the tooth clearance and the changing number of the mating tooth pairs.
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