Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen
When radial load applied to the bearings was high, ball excursion occurring in the retainer ball-pockets became large due to ball-speed-variation (BSV). Such BSV was also caused by inclination of the outer race to the shaft (tilted misalignment). If pocket clearance was smaller than maximum ball exc...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Japanese Society of Tribologists
2010-04-01
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| Series: | Tribology Online |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/trol/5/2/5_2_71/_pdf/-char/en |
| _version_ | 1818900244629291008 |
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| author | Masataka Nosaka Satoshi Takada Makoto Yoshida Masataka Kikuchi Takayuki Sudo Shohei Nakamura |
| author_facet | Masataka Nosaka Satoshi Takada Makoto Yoshida Masataka Kikuchi Takayuki Sudo Shohei Nakamura |
| author_sort | Masataka Nosaka |
| collection | DOAJ |
| description | When radial load applied to the bearings was high, ball excursion occurring in the retainer ball-pockets became large due to ball-speed-variation (BSV). Such BSV was also caused by inclination of the outer race to the shaft (tilted misalignment). If pocket clearance was smaller than maximum ball excursion, large force was imposed on the ball-retainer contact, resulting in retainer damage. The objective of this experimental and analytical research was to determine the effect of tilted misalignment on the tribo-characteristics of 40-mm-bore ball bearings in liquid hydrogen. The bearings used a retainer having elliptical-shaped ball pockets to restrain the ball-retainer contact due to high BSV. Various ball-pocket clearances (1.75, 1.95, 2.15 mm) were tested under high tilted misalignment conditions in a level of 1.9-3.5 × 10-3 mm/mm at speeds up to 50,000 rpm and thrust loads of 590-2,650 N. Testing showed that, the retainer having a pocket clearance of 2.15 mm, the clearance of which was possibly larger than the maximum ball excursion emphasized by high tilted misalignment, enabled to stabilize the bearing torque and the bearing temperature at a speed of 50,000 rpm. Based on the results, the threshold of the ball-retainer contact occurred by tilted misalignment was discussed. |
| first_indexed | 2024-12-19T20:00:47Z |
| format | Article |
| id | doaj.art-bdb6f04e715e4d4c9e7fd7103d43cc21 |
| institution | Directory Open Access Journal |
| issn | 1881-2198 |
| language | English |
| last_indexed | 2024-12-19T20:00:47Z |
| publishDate | 2010-04-01 |
| publisher | Japanese Society of Tribologists |
| record_format | Article |
| series | Tribology Online |
| spelling | doaj.art-bdb6f04e715e4d4c9e7fd7103d43cc212022-12-21T20:07:41ZengJapanese Society of TribologistsTribology Online1881-21982010-04-0152717910.2474/trol.5.71trolEffect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid HydrogenMasataka Nosaka0Satoshi Takada1Makoto Yoshida2Masataka Kikuchi3Takayuki Sudo4Shohei Nakamura5Department of Mechanical Engineering, The University of TokyoKakuda Space Center, Japan Aerospace Exploration AgencyKakuda Space Center, Japan Aerospace Exploration AgencyKakuda Space Center, Japan Aerospace Exploration AgencyKakuda Space Center, Japan Aerospace Exploration AgencyAerospace Project Team, Industrial Sales Headquarters, NTN corporationWhen radial load applied to the bearings was high, ball excursion occurring in the retainer ball-pockets became large due to ball-speed-variation (BSV). Such BSV was also caused by inclination of the outer race to the shaft (tilted misalignment). If pocket clearance was smaller than maximum ball excursion, large force was imposed on the ball-retainer contact, resulting in retainer damage. The objective of this experimental and analytical research was to determine the effect of tilted misalignment on the tribo-characteristics of 40-mm-bore ball bearings in liquid hydrogen. The bearings used a retainer having elliptical-shaped ball pockets to restrain the ball-retainer contact due to high BSV. Various ball-pocket clearances (1.75, 1.95, 2.15 mm) were tested under high tilted misalignment conditions in a level of 1.9-3.5 × 10-3 mm/mm at speeds up to 50,000 rpm and thrust loads of 590-2,650 N. Testing showed that, the retainer having a pocket clearance of 2.15 mm, the clearance of which was possibly larger than the maximum ball excursion emphasized by high tilted misalignment, enabled to stabilize the bearing torque and the bearing temperature at a speed of 50,000 rpm. Based on the results, the threshold of the ball-retainer contact occurred by tilted misalignment was discussed.https://www.jstage.jst.go.jp/article/trol/5/2/5_2_71/_pdf/-char/encryogenicliquid hydrogensolid-lubricationhigh-speed ball bearingretainer failuremisalignmentelliptical ball-pocketball-speed-variationbearing torquebearing temperature |
| spellingShingle | Masataka Nosaka Satoshi Takada Makoto Yoshida Masataka Kikuchi Takayuki Sudo Shohei Nakamura Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen Tribology Online cryogenic liquid hydrogen solid-lubrication high-speed ball bearing retainer failure misalignment elliptical ball-pocket ball-speed-variation bearing torque bearing temperature |
| title | Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen |
| title_full | Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen |
| title_fullStr | Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen |
| title_full_unstemmed | Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen |
| title_short | Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen |
| title_sort | effect of tilted misalignment on tribo characteristics of high speed ball bearings in liquid hydrogen |
| topic | cryogenic liquid hydrogen solid-lubrication high-speed ball bearing retainer failure misalignment elliptical ball-pocket ball-speed-variation bearing torque bearing temperature |
| url | https://www.jstage.jst.go.jp/article/trol/5/2/5_2_71/_pdf/-char/en |
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