A hydrodynamic fluid film bearing for supporting a rotation shaft of a turbo or rotary apparatus includes a sleeve having a circular inner opening for receiving a rotation shaft therein, at least one metallic foil member of arc shape having one end fixed to the inner surface of the sleeve and arranged along the inner opening of the sleeve, and at least one elastic member disposed at the sleeve between the sleeve and the foil member. A bearing housing for receiving a bearing of a rotary apparatus is further provided, in which the bearing housing includes a circular opening for receiving the bearing therein, and the circular inner opening of the bearing housing includes grooves for cooling air passage formed at regular interval in the axial direction on the inner surface of the bearing housing. The bearing received in the bearing housing is preferably a hydrodynamic fluid film bearing.
There is provided a micro power generating device. A compressor impeller and a turbine wheel are coupled to the ends of a rotating shaft. A cooler is provided for lowering a temperature of the compressed air from the compressor impeller. The compressed air is mixed with the fuel and combusted in a combustion chamber. An air foil thrust bearing for supporting the rotating shaft has a thrust collar coupled to the rotating shaft, as well as a pair of thrust discs located apart from the thrust collar and fixed to the housing. Impeller type seals are formed at both surfaces of the thrust collar and impulse turbine blades are formed at the periphery of the thrust collar. A generator is positioned between the air foil thrust bearing and the compressor impeller. A portion of the cool air is bypassed toward the generator and the impulse turbine blades from the cooler.
