DYNAMIC PRESSURE TYPE GAS BEARING AND MICRO GAS TURBINE WITH DYNAMIC PRESSURE TYPE GAS BEARING

摘要

PROBLEM TO BE SOLVED: To provide a dynamic pressure type gas bearing capable of assuring a sufficient rigidity for recovering an eccentric rotating shaft to an original position when a variable load or an impact load is applied to the rotating shaft due to the eccentricity of the rotating shaft during the rotation and also assuring an attenuation contributing to a stability at a high speed. SOLUTION: This dynamic pressure type gas bearing comprises a bearing segment disposed on a stationary holding member opposed to a rotating member. The bearing segment disposed on the stationary holding member comprises a corrugated bump foil with a specified elasticity and a top foil positioned on the bump foil. The bump foil comprises a lower bump foil on the stationary holding member side and an upper bump foil on the rotating member side opposed to each other. The upper bump foil and the lower bump foil are engaged with each other beforehand so that the tilted surfaces of the crests thereof are overlapped with each other.