Analysis of Dynamic Wear Characteristics of Needle Roller Bearing for RV Reducer
The needle roller bearing within an RV(rotary vector)reducer is characterized by small radial size and complex dynamic contact loads,making it prone to wear and failure.This degradation significantly reduces the RV reducer's working performance,decreasing its original transmission accuracy and potentially leading to failure dam-age.A coupling model of the dynamics and wear of the cycloidal needle wheel and needle roller bearing transmission mechanism was proposed based on contact multi-body dynamics and Archard's wear theory.This model aimed to re-veal the dynamic wear characteristics of the needle roller bearings in RV reducers.By leveraging contact multi-body dynamics,the model calculated the dynamic contact load of the needle roller bearings,providing the instantaneous normal contact force between the rolling elements and the inner and outer races.The wear shape of the inner and outer raceways of the bearing was subsequently expressed by accumulation,with the instantaneous wear amount for each computed using Archard's wear model.Using the RV20E-121 reducer as the object,the coupling model was used to analyze the dynamic wear characteristics of the inner and outer raceways of the needle roller bearing.This analysis enabled the calculation of the cumulative wear quantity and distribution for both raceways alongside the drawing of the shape diagrams after wear.The findings indicate that the inner raceway shows more severe wear than the outer raceway and that the wear is not uniformly distributed.Cumulative contact wear is greater in the cycloidal wheel's circular direction for the outer raceway and in the vertical eccentricity direction for the inner raceway.The uneven wear pattern observed in the inner raceway,with more severe wear compared to the outer raceway,is determined by a bearing raceway wear shape detection method based on endurance fatigue tests of the RV20E-121 reducer.The outer raceway's wear is concentrated in the cycloidal wheel's circular direction,while the inner raceway's wear is more pronounced in the vertical eccentricity direction.The simulation results are consistent with the cumulative wear law.
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