Externally Pressurized Gas Journal Bearing with Slot Restrictors Arranged in the Axial Direction (Experimental Verification of Bearing Stiffness using Large Unbalanced Rotor)

摘要

In this study, new rectangular slot restriction-type externally pressurized gas journal bearing has been developed for use in high-speed rotating machinery. The proposed bearing has several rectangular slot restrictors arranged in the inner sur-face of the bearing. This restrictors has high stiffness for couple of force. The material of the prototype bearing was PPS (Poly Phenylcne Sulfide) resin, the machining accuracy (roundness) of the bearing was improved. Experimental verification using large unbalanced rotor was carried out. Unbalance to the rotor was set to generate vibration in cylindrical mode and conical mode. The rotational speed is 11, 000rpm. The bearing diameter and length are 30mm and 40mm, respectively. As a result, it was clarified that the proposed bearings have smaller rotor vibration and improved rigidity than the conventional type.