CAGEDYN: A Contribution to Roller Bearing Dynamic Calculations Part II: Description of the Numerical Tool and Its Outputs

Abstract

Analytical relationships are given for calculating in a planetary application the radial and orbital roller centrifugal forces usually taken by the outer race and cage-bridge, respectively. Each roller is described using two rotational degrees of freedom (dof), and the cage is described using two radial dof and one rotational dof. The model has been incorporated in a new tool, called CAGEDYN. Many graphical outputs are shown using one example: a needle roller bearing calculated at one given load and speed in a planetary and nonplanetary application with the significant differences outlined. This tool is particularly useful for design and application engineers expecting an answer within a few minutes of CPU time on a standard laptop.

KEY WORDS:

• Rolling Bearings
• Traction
• Cage Impact Forces
• Dynamic Bearing and Cage Behavior

ACKNOWLEDGMENTS

The author would like to thank the TIMKEN Company for permission to publish this work, as well as several interns (F. Constantin, N. Koenig, and T. Favre especially) who started IMPACT6 and CAGEDYN and some colleagues (J. Suchanek, D. Prock, M. Cadile, E. Hood, and P. Roy) who took part in the development of CAGEDYN or benchmarked it versus some application field results. Special thanks also to B. Pederson for his contribution to DBM and our discussions about cage calculations.

Review led by Bob Bruce