A Study on Dynamic Load Characteristics of Multi-group Needle Roller Bearings Used in RV Reducer Considering the Position Errors

doi:10.3901/JME.2022.17.144

Abstract

Abstract: The needle roller bearing (NRB) is a critical part that restricts the operational reliability and service life of RV reducers. The research aims to reveal the influences of position errors on the changes in the dynamic contact load acting on an NRB and on the force-transfer and loading-sharing performance of multiple sets of NRBs. For this purpose, a dynamical model of a transmission mechanism coupling multiple sets of NRBs and cycloidal-pin gears considering position errors is established. Therein, by analyzing multi-point meshing and contact patterns in a cycloid-pin gear mechanism, the normal contact load and tangential friction load of the cycloid-pin gear pair are calculated. In addition, the contact load of rolling elements and the equivalent constraining force on the bearing joint are obtained by analyzing the dynamic contact of NRBs. On this basis, the expression for the position errors of the bearing holes on the cycloidal gears is proposed, and the integration of dynamical model for the transmission mechanism coupling multi-group of NRBs and cycloidal-pin gears is completed. Finally, taking a typical RV80E reducer with three crankshafts as the research object, influences of position errors on the dynamic load distribution on NRBs and on the force-transfer and load-sharing performance of multiple sets of bearings are investigated. Research results indicate that the maximum load on rolling pins in the NRB can be as high as 5.19 times the average load, and the maximum and minimum loads on the bearings are separately 1.60 and 0.21 times the average, indicative of a large amplitude difference in load fluctuation. With increases in the range of the position errors and the reduction in machining precision, the difference in the average load on the NRBs increases and the deflection-induced load between bearings increases.

Key words: RV reducer, needle roller bearing, cycloidal-pin transmission, dynamics

CLC Number:

TH113

XU Lixin. A Study on Dynamic Load Characteristics of Multi-group Needle Roller Bearings Used in RV Reducer Considering the Position Errors[J]. Journal of Mechanical Engineering, 2022, 58(17): 144-155.

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