A Study of Influence of the Machining Accuracy on Reliability of Cycloidal Gears

Cycloidal gears are widely used in modern robotics, aircraft industry and other industries due to their compactness, high load bearing capacity, rigidity and accuracy. This paper examines a method for calculating stresses at the points of contact of the satellite gear and the pins taking into account manufacturing errors. Based on the Monte Carlo method, the probability of failure-free operation of the cycloid gear is determined by the criterion of contact endurance, taking into account the randomness of deviations of gear sizes from the nominal ones. Graphs showing the relationships between the probability of failure-free operation for a fixed period of time and the torque are presented. It is established that a 2kv gear has a higher reliability compared to the gear manufactured using the khv scheme. Based on the analysis of sensitivity of the failure-free operation probability to manufacturing errors, it is concluded that the positional error of the pin hole has the maximum effect on the gear performance.

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