オイケ　マモル   Mamoru Oike   尾池　守    所属   石巻専修大学  理工学部    職種   教授
言語種別	英語
発行・発表の年月	2012/09
形態種別	研究論文（学術雑誌）
標題	Robustness of Cryojenic Hybrid Journal Bearings
執筆形態	共著
掲載誌名	JAST Tribology Online
巻・号・頁	Vol. 7(No. 3),pp.171-178
著者・共著者	M. Kikuchi, S. Takada, T. Sudo and T. Takano
概要	In the present study, a nine-recess hybrid journal bearing (HJB) having a Young Leaf Mark recess was operated at a rotational speed of up to 75,000 rpm using the cryogenic journal bearing test apparatus at JAXA, to clarify an onset speed of the rotor instability supported by the cryogenic HJBs. Liquid nitrogen was supplied to the test bearing with a pressure of up to 4 MPa. The test bearing is 60 mm in diameter, 25 mm in width, with a 0.055-mm clearance and a recess area ratio of 0.186. When the HJB was operated at a rotational speed of over 74,000 rpm in liquid nitrogen, hard frictional contact between the bearing surface and the journal surface occurred, which consequently caused considerable damage to the Cr2O3 coating film on the journal. The results confirmed that the HJB surface damage had relatively little effect on HJB performance. Therefore, cryogenic HJB tested can be considered to have sufficient robustness when the rotational speed is below 60,000 rpm.
DOI	10.247/trol.7.171