Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5019047 | Precision Engineering | 2017 | 7 Pages |
Abstract
In this study, a novel rectangular slot restriction-type externally pressurized gas journal bearing was developed for use in high-speed rotating machinery, such as medical devices and industrial machines. The proposed bearing has several rectangular slot restrictors arranged in the inner surface of the bearing. To measure the bearing characteristics, a model was developed for the numerical calculation of the pressure distribution in the bearing clearance and the static characteristics of the bearing. The proposed bearing, which consists of two parts, was designed and can be manufactured using appropriate techniques. In this study, a prototype bearing with eight slots in its surface was manufactured as a test piece for fundamental tests. The diameter and length of the test bearing are 30 and 40Â mm, respectively. The roundness of the bearing was measured using a three-dimensional coordinate measuring machine, and the results were used in the analysis. The pressure distribution and static characteristics obtained experimentally were found to be in good agreement with the calculated values. In the rotational tests, the rotor speed exceeded 380Â Hz (22,800Â rpm), and whirl vibration did not occur. During testing, the maximum rotor vibration amplitude was 0.002Â mm, corresponding to an eccentricity ratio of 0.3.
Related Topics
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Authors
Tomohiko Ise, Masaya Nakatsuka, Kohei Nagao, Masami Matsubara, Shozo Kawamura, Toshihiko Asami, Tomoya Kinugawa, Kazuhiko Nishimura,