Dynamic stability of cages in high-speed tapered roller bearings with grease lubrication

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 49-57.

WU Zhenghai1, XU Yingqiang1, DENG Sier2，CAO Dongbo1

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Abstract

The multi-body contact between the cage and bearing parts was analyzed based on the theory of grease elastohydrodynamic lubrication and squeeze film lubrication.The dynamic model of a tapered roller bearing cage was established, considering the equivalent stiffness and damping of lubricant film.The fourth order Runge-Kutta method was used to calculate and analyse the influences of speed, load and preload on the cage dynamic characteristics, and then the dynamic stability of nylon, steel and copper cages was compared and analyzed.The results show that the contact force between the cage and guide ring is much greater than the pocket contact force, and the sliding rate of the cage is lower than that of the roller even in running state.The sliding rate of cage and roller increases with the speed increasing, and decreases with the increase in load or preload.The smaller the pocket clearance, the better the dynamic stability of the cage, and the smaller the pocket contact force.The smaller the guiding surface clearance, the worse the dynamic stability of the cage, but the contact force between the cage and guiding surface is reduced.In the analysis range of bearing rotational speed, the dynamic stability of the nylon cage and copper cage increases with the increase in bearing rotational speed, and the stability of the steel cage is more inferior than that of the nylon cage and copper cage at high speed.

Key words

tapered roller bearing / grease lubrication / cage / dynamic stability / EHL

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WU Zhenghai1, XU Yingqiang1, DENG Sier2，CAO Dongbo1. Dynamic stability of cages in high-speed tapered roller bearings with grease lubrication[J]. Journal of Vibration and Shock, 2019, 38(10): 49-57

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