C29 大負荷回転軸用の自成絞り非対称給気静圧ジャーナル軸受の特性(M-OS5-2 フルードパワーの基礎,M-OS5 フルードパワーの基礎と応用,「海を越え,国を越え,世代を超えて!」)

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  • C29 Characteristics of Externally Pressurized Gas Journal Bearings with Asymmetrically Arranged Inherent Orifices for Large Load Rotors

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Rotating machineries have problems at bearings to support a rotor such as seismic ACROSS (Accurately Controlled Routinely Operated Signal System) transmitters. The rotor is supported by rolling contact bearings. The bearings in the transmitters, large heat generation occur caused by the high friction loss. In order to solve this problem, externally pressurized gas journal bearings with asymmetrically arranged inherent orifices has been developed for large load rotors. Numerical calculation of this bearing was carried out to obtain the characteristics using Divergence Formulation Method. Three types of bearing models have different placement of feed holes, respectively, i.e., Type A is the conventional symmetric type, which has eight feed holes in the bearing surface with equal distance. Type B is the proposed asymmetrical type, which has six feed holes at loading side of bearing surface and two feed holes at that of counter-loading side. Type C is also the proposed asymmetrical type, which has seven feed holes and one feed hole. The results showed that the proposed asymmetrical bearings have large load capacity and small flow rate compared with the conventional symmetric bearing.

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