歯車と軸の締結部におけるクリープ挙動の解明

概要

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We present an analysis of the relative movement of shrink-fit connections between gears and shafts. First, it is shown experimentally that microslip can occur on mating surfaces even if transmitting torque does not exceed the static frictional torque. Therefore, the relative movement increases with the number of rotations. However, there is a transmitting torque threshold below which no relative movement occurs. The contact behavior and microslip of mating surfaces are also investigated with increasing transmission torque, by three-dimensional finite-element analysis. The experimental threshold values agree well with those predicted from theoretical calculations on the slip model, which are based on the numerical results of shear stress distribution along the interface and on Coulomb's law of friction. These thresholds are functions of the gear/shaft design parameters, such as the ratio of shaft diameter to gear rim thickness, interference, friction coefficient, and gear width. The results can be used to establish qualitative criteria to improve connection design.
社団法人日本機械学会の論文
1996-06-25