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Effects of Load Distribution on Life of Radial Roller Bearings

[+] Author and Article Information
Takafumi Nagatomo1

Materials Technology Division,  Railway Technical Research Institute, Kokubunji, Tokyo 185-8540, Japannagatomo@rtri.or.jp

Ken Takahashi, Yoshiaki Okamura

Materials Technology Division,  Railway Technical Research Institute, Kokubunji, Tokyo 185-8540, Japan

Takehiko Kigawa2

 Railway Technical Research Institute, Kokubunji, Tokyo 185-8540, Japan

Shoji Noguchi

Department of Mechanical Engineering, Faculty of Science and Technology,  Tokyo University of Science, Noda, Chiba 278-8510, Japan

1

Corresponding author.

2

Former address.

J. Tribol 134(2), 021101 (Apr 12, 2012) (7 pages) doi:10.1115/1.4006175 History: Received September 29, 2011; Revised February 16, 2012; Published April 11, 2012; Online April 12, 2012

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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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Rolling element load distribution

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Figure 2

A measuring inner ring equipped with an optical fiber sensor

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Figure 3

Housing models (all dimensions are in millimeters)

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Figure 4

Schematic view of the measurement system for load distribution

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Figure 5

An example of strain measurement

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Figure 6

Roller load versus roller position

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Figure 7

L/L0 versus d/d0

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Figure 8

Qi  /Qi 0 , Qe  /Qe 0 versus d /d0

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Figure 9

Rockwell hardness indents on the outer raceway

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Figure 10

Weibull plots for endurance test results

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Figure 11

Calculated life versus experimental life

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Figure 12

Qmax versus experimental life

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Figure 13

Qi , Qe versus experimental life

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