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...

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Autores principales:	Masataka Nosaka, Satoshi Takada, Makoto Yoshida, Masataka Kikuchi, Takayuki Sudo, Shohei Nakamura
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2010
Materias:	cryogenic liquid hydrogen solid-lubrication high-speed ball bearing retainer failure misalignment elliptical ball-pocket ball-speed-variation bearing torque bearing temperature Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/bdb6f04e715e4d4c9e7fd7103d43cc21
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spelling	oai:doaj.org-article:bdb6f04e715e4d4c9e7fd7103d43cc212021-11-05T09:27:10ZEffect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen1881-219810.2474/trol.5.71https://doaj.org/article/bdb6f04e715e4d4c9e7fd7103d43cc212010-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/5/2/5_2_71/_pdf/-char/enhttps://doaj.org/toc/1881-2198When 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.Masataka NosakaSatoshi TakadaMakoto YoshidaMasataka KikuchiTakayuki SudoShohei NakamuraJapanese Society of Tribologistsarticlecryogenicliquid hydrogensolid-lubricationhigh-speed ball bearingretainer failuremisalignmentelliptical ball-pocketball-speed-variationbearing torquebearing temperaturePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 5, Iss 2, Pp 71-79 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	cryogenic liquid hydrogen solid-lubrication high-speed ball bearing retainer failure misalignment elliptical ball-pocket ball-speed-variation bearing torque bearing temperature Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	cryogenic liquid hydrogen solid-lubrication high-speed ball bearing retainer failure misalignment elliptical ball-pocket ball-speed-variation bearing torque bearing temperature Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 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
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.
format	article
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
title	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_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_sort	effect of tilted misalignment on tribo-characteristics of high-speed ball bearings in liquid hydrogen
publisher	Japanese Society of Tribologists
publishDate	2010
url	https://doaj.org/article/bdb6f04e715e4d4c9e7fd7103d43cc21
work_keys_str_mv	AT masatakanosaka effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen AT satoshitakada effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen AT makotoyoshida effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen AT masatakakikuchi effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen AT takayukisudo effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen AT shoheinakamura effectoftiltedmisalignmentontribocharacteristicsofhighspeedballbearingsinliquidhydrogen
_version_	1718444372768325632

Effect of Tilted Misalignment on Tribo-Characteristics of High-Speed Ball Bearings in Liquid Hydrogen

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