Optimization design of noncircular gear planetary gear system based on noncircular beveloid gear

Abstract

To solve the problems of vibration and poor stability of Noncircular Planetary Gear (NPG), Noncircular Beveloid Gear (NBG) with automatic clearance adjustment function is proposed in this paper. Based on the characteristics of noncircular gear transmission and meshing principle, the NBG tooth surface equation was derived. By establishing a three-dimensional model of NBG, the accuracy of the theoretical model was verified, and it was applied to NPG for comparative research. The effects of different loads, velocities, and frictional forces on the optimization effect were analyzed. The research results indicate that NBG has the performance of both noncircular gears and involute beveloid gears, which can achieve variable transmission ratio. The contact area of the tooth surface is distributed in an inclined belt shape, and the transmission error ratio remains below 6 %, with stronger stability. After applying NBG to NPG, the problem of NPG tooth impact was improved, and the torque impact amplitude of the gear system was reduced to below 3.5 N·m, a year-on-year decrease of 58.99 %. The optimized NPG has a good mitigating effect on torque impact under different loads, rotational speed, and friction conditions.