Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10419468 | Precision Engineering | 2014 | 6 Pages |
Abstract
We have developed externally pressurized small-size conical shaped gas bearings for micro rotary machines such as gas blowers, compressors, and medical devices. The bearings are lightweight and enable machines and devices to be downsized by reducing the number of parts, since the journal and thrust loads can be supported by a pair of bearings. The conical bearings (diameters 8Â mm and 10Â mm) were designed and the manufacturing techniques were considered. The bearing type is a double-row inherent orifice bearing with four feed holes per row. The shape accuracy of the manufactured bearings is within the design limits, being less than 0.005Â mm in both roundness and cylindricity. The surface roughness (arithmetic average roughness) of the parts is 0.0002Â mm. The static characteristics were calculated and validated by testing on manufactured bearings. Comparative agreement was obtained between the measured and designed values. The proposed calculation method presents as a relatively simple approach for predicting the bearing characteristics. The test rotor exceeded 350Â Hz (21,000Â rpm) in the rotational test, and whirl vibration was absent. During testing, the maximum rotor vibration amplitude was 0.0125Â mm (corresponding to an eccentricity ratio of 0.89).
Related Topics
Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Tomohiko Ise, Naoyuki Arita, Toshihiko Asami, Takenori Nakajima, Iwao Kawashima, Tadashi Maeda,