A dynamic analysis tool for calculating cage stress in needle roller bearings under planetary motions was developed to examine the mechanism of rising cage stress. This analysis considers three degrees of freedom of a cage and rollers and two degrees of freedom of a planetary gear in two-dimensional model. Moreover, the elastic deformation of the cage is implemented to determine the cage stress by using a Component-Mode-Synthesis method. In order to validate this dynamic analysis, two needle roller bearings with different structural cage strengths were tested in a planetary gear system. In cases where the weaker cages were damaged, the analyzed stress of the cages nearly reached or exceeded the material fatigue strength. This high stress was observed when a roller passed the load zone collided with the pocket bar due to the centrifugal force of planetary motion. The maximum cage stress increased with the carrier rotation speed and the stress of the damaged weaker cage only exceeded the fatigue strength in the experimental range of carrier speed. These results indicate that the dynamic model is effective and valid for the current application.
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ASME/STLE 2007 International Joint Tribology Conference
October 22–24, 2007
San Diego, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4810-8
PROCEEDINGS PAPER
Dynamic Analysis of Cage Stress in Needle Roller Bearings Under Planetary Motions
Tomoya Sakaguchi,
Tomoya Sakaguchi
NTN Corporation, Kuwana, Mie, Japan
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Makoto Nishikawa,
Makoto Nishikawa
NTN Corporation, Iwata, Shizuoka, Japan
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Sadatsune Kazama,
Sadatsune Kazama
NTN Corporation, Iwata, Shizuoka, Japan
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Hisataka Hasegawa,
Hisataka Hasegawa
NTN Corporation, Iwata, Shizuoka, Japan
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Masanori Satou
Masanori Satou
NTN Corporation, Iwata, Shizuoka, Japan
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Tomoya Sakaguchi
NTN Corporation, Kuwana, Mie, Japan
Makoto Nishikawa
NTN Corporation, Iwata, Shizuoka, Japan
Sadatsune Kazama
NTN Corporation, Iwata, Shizuoka, Japan
Hisataka Hasegawa
NTN Corporation, Iwata, Shizuoka, Japan
Masanori Satou
NTN Corporation, Iwata, Shizuoka, Japan
Paper No:
IJTC2007-44189, pp. 375-377; 3 pages
Published Online:
March 23, 2009
Citation
Sakaguchi, T, Nishikawa, M, Kazama, S, Hasegawa, H, & Satou, M. "Dynamic Analysis of Cage Stress in Needle Roller Bearings Under Planetary Motions." Proceedings of the ASME/STLE 2007 International Joint Tribology Conference. ASME/STLE 2007 International Joint Tribology Conference, Parts A and B. San Diego, California, USA. October 22–24, 2007. pp. 375-377. ASME. https://doi.org/10.1115/IJTC2007-44189
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