Моделювання показників жорсткості епіциклу планетарного колісного редуктора

Abstract

On the basis of developed analytical models of an epicycle as a part of planetary wheel gear of trolleybus it is received a function of the specific rigidity considering the crack sizes, elastic deformations of teeths and of a rim of an epicycle under the influence of operational loadings. According to the analysis of operational damages the kinetics of fatigue cracks in a rim of epicycle is investigated. It is established that in epicycles with rather thin rim the kinetics of a fatigue crack totals three stages. The crack arising in a hollow between teeth is directed on a normal to a hollow surface, and after an exit to an external surface turns in thickness of a rim where under the influence of sign-variable flexural tension develops parallel to an axis. Final destruction of a rim is observed on a site of spline connection of an epicycle with the gearbox casing in section at an angle 25…40°.