Modelling and stress analysis for double-row curvic couplings

This paper proposes a parameterized modelling method that considers the details of the machining process for double-row curvic couplings and presents a modified stress analytical method that can take the deep beam bending effect into account. The modified method provides a more accurate equivalent stress estimation than the classic Gleason method, which is demonstrated by the nonlinear finite element simulation. The contact stress and the contact status of the curvic couplings in high-speed rotation situations are analysed with the nonlinear FEA method under different loads. The results show that the strength of the weak regions of the double-row curvic couplings occur at the tooth root and the tooth to near the bolts. The bolt preload has the greatest influence on the contact stress and the contact status. The rotating speed reduces the bolt preload, causing the stress to decrease. The torque results in contact stress and contact status of different sides of the tooth being obviously different. Finally, the modified analytic method is recommended during the preliminary design, and the FEA method considering the contact effects is recommended for the detailing design.