Study of Friction Torque of Needle Roller Thrust Bearings

doi:10.3969/j.issn.1000-1093.2015.07.026

Abstract

Abstract: The dynamic differential equations of needle roller thrust bearings are established based on the dynamic theory of rolling bearings. The precise integration method and the predicting-correcting Adams-Bashforth-Moulton multistep method are used to solve the equations, and the friction torque mathematic models of needle roller thrust bearings are built. The influences of working conditions and structural parameters on the friction torque of needle roller thrust bearings are investigated. The results show that the slip friction between roller and raceway is main component of the friction torque of needle roller thrust bearings.the friction between cage and roller also becomes the main component at high speed , and a small pocket clearance is in favor of reducing the friction torque. An optimal speed can be selected, which makes the friction the smallest. The friction torque is in direct proportion to the axial load, and the proportional coefficient decreases with the rise of rotating speed of bearings. The roller profile modification can reduce the friction torque evidently, the full arc profile modification is the most propitious to reduce the friction torque compared to crowned shapes.the friction torque increases with the rise of roller number and effective length , and the friction torque decreases with the rise of the roller diameter. These parameters should be rationally optimized to reduce the friction torque.

Key words: mechanics, needle roller thrust bearing, friction torque, dynamics, roller profile modification

CLC Number:

TH133.33

DENG Si-er, LI Meng, LU Yu-jia, DAI Yan-bin. Study of Friction Torque of Needle Roller Thrust Bearings[J]. Acta Armamentarii, 2015, 36(7): 1347-1355.

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