Patent ID: 8807921

Claim:
A bearing foil assembly comprising: a top foil, an intermediate foil, and a bump foil, said bump foil being provided with corrugations at circumferentially spaced locations about a center axis, said bump foil having a bent end that is bent radially outwardly from the center axis; said top and intermediate foils having a bent portion extending radially outwardly and adjacent to said bent end of said bump foil, and there being a first radius of curvature to a curved portion of the bent portion at a first end adjacent to said bent end, and a second radius of curvature at an end of said bent portion on an end opposed to said bent end, with a ratio of said first radius of curvature to the second radius of curvature being between 0.6 and 10; a pitch distance of the corrugations in the bump foil is defined, and a ratio of the pitch distance to a radius of a shaft which is to be supported within the foil assembly is between 0.25 and 0.70; a ratio of said pitch distance to a thickness of said bump foil is between 25 and 60; a wedge step distance is defined between the top and intermediate foils, a ratio of the pitch distance to the wedge step distance is between 6 and 17; and a ratio of the first radius of curvature to the radius of the shaft that is to be supported within the foil assembly is between 0.02 and 0.08.