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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

EXPERIMENTAL INVESTIGATION OF FRICTION CHARACTERISTICS OF INSTRUMENT BALL BEARINGS IN VACUUM AND AT LHe TEMPERATURES

X. Z. Li
Department of Refrigeration and Cryogenics Xi'an Jiaotong University, Xi'an 710049, China

H. Yang
Department of Refrigeration and Cryogenics Xi'an Jiaotong University, Xi'an 710049, China

K. Cheng
Department of Refrigeration and Cryogenics Xi'an Jiaotong University, Xi'an 710049, China

Y.W. Liu
Department of Refrigeration and Cryogenics Xi'an Jiaotong University, Xi'an 710049, China

Y. Z. Wu
Department of Refrigeration and Cryogenics Xi'an Jiaotong University, Xi'an 710049, China

H. -D. Denner
Low Temperature Laboratory Free University Berlin, Arnimallee 14, Berlin, Germany

Abstract

The friction performance of precision instrument-size ball bearings at cryogenic temperatures are special important in designing space instruments which are need to be cooled to low temperatures during operation. The friction characteristics of ball bearings can be obtained by measuring the friction heat generated by the bearings. A reliable method for measuring the friction heat in vacuum and at liquid helium (LHe) temperatures is proposed in this paper. The experimental results for a stainless steel ball bearing with different rotating speeds, axial pre-loads and temperatures are presented. The friction heat generated at the bearing sample is found to be proportional to both rotating speed and axial pre-load and to be independent of temperature in the test range.