Foil gas bearing

摘要

The present invention is to provides a foil gas bearing which has sufficient damping effects due to a frictional force and a sufficient stiffness to support the rotary shaft. The foil gas bearing has a rotary shaft retainer for retaining a rotary shaft; and a back spring for preventing the displacement of the rotary shaft, which is provided between rotary shaft and rotary shaft retainer. Plural protrusions are formed at one element, which is either the rotary shaft retainer or the back spring. Plural recesses are formed at the other elements, which is either the back spring or the rotary shaft retainer at places which correspond to the protrusions. The protrusions partially fit into the recesses.