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An external load applied to a radial rolling bearing is distributed among the rolling elements. In many applications, the bearing internal load distribution may be altered by the elastic deformations of the bearing rings. This alteration can have an effect on bearing life. The objective of this study is to investigate the effect of load distribution on bearing life, both theoretically and experimentally, using several housing models which provide different contact conditions between the housing bore and the outer ring. This paper first presents a newly developed method of determining dynamic load distributions with an optical fiber strain sensor. The measurements of the load distribution for the housing models by using this method have shown that the contact condition between the housing bore and the outer ring affects the load distribution, and the effect of the load distribution on the bearing life has been confirmed by the theoretical calculation of the bearing life. Furthermore, endurance tests using dented bearings were performed to validate the effect of load distribution on bearing life. The results of the tests have substantiated that the bearing life is substantially affected by the load distribution; moreover, it has been shown that there is a linear relationship between the calculated lives and the experimental ones.

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Effects of Load Distribution on Life of Radial Roller Bearings

Nagatomo

Takahashi

Okamura

et al. 2012

Journal of Tribology

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Effect of Loading Position of Housing on Rolling Element Load Distribution of Rolling Bearings

Nagatomo¹,

Takahashi²,

Okamura³

et al. 2012

Trans.JSME(C)

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An external load applied to a rolling bearing is distributed among the rolling elements. The conventional calculation of load distribution among rolling elements already established assumes that the bearing races, shaft and housing are rigid except for elastic contact deformations at the individual contacts between rolling elements and raceways. In many applications, the bearing rings as well as the supporting structures can not be considered rigid, so that the actual load distribution is different from that predicted on the above assumption. A newly method of determining dynamic load distributions using an optical fiber strain sensor mounted on a roller of an actual cylindrical roller bearing has been already proposed in our previous work. The objective of this study is to investigate the effect of loading positions of a housing on the load distributions. The measurement results have shown different load distributions from those obtained from the conventional theory. This paper has proposed an expanded load distribution function giving such load distributions which can not be expressed by the conventional theory, and investigated the effect of the load distribution on bearing life. Furthermore, the relationship between the load distribution and the housing deformation has been investigated with the finite element method (FEM).

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Cited by 2 publications

References 2 publications

Effects of Load Distribution on Life of Radial Roller Bearings

Effects of Load Distribution on Life of Radial Roller Bearings

Effect of Loading Position of Housing on Rolling Element Load Distribution of Rolling Bearings

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