Foil bearing assembly including bidirectional anti-rotation features and compressor including same

A foil bearing assembly comprising:

• an outer foil assembly comprising an outer foil extending circumferentially from a first outer foil end to a second outer foil end, and a first anti-rotation tab at the first outer foil end;
• a bump foil assembly positioned radially inward of the outer foil;
• and
• an inner foil assembly positioned radially inward of the bump foil assembly, the inner foil assembly comprising an inner foil extending circumferentially from a first inner foil end to a second inner foil end, and a second anti-rotation tab at the second inner foil end, wherein the first inner foil end is attached to the outer foil proximate the first outer foil end by welding or brazing.

A compressor comprising:

• a compressor housing;
• a shaft rotatably supported within the compressor housing;
• an impeller connected to the shaft;
• a bearing housing mounted within the compressor housing, the bearing housing having an inner surface defining a cylindrical bore through which the shaft extends, and a slot defined in the inner surface;
• and
• a foil bearing assembly positioned within the cylindrical bore radially outward of the shaft, the foil bearing assembly comprising:
• an outer foil assembly comprising an outer foil extending circumferentially from a first outer foil end to a second outer foil end, and a first anti-rotation tab at the first outer foil end that is received by the slot to limit circumferential movement of the outer foil relative to the bearing housing in a first direction;
• a bump foil assembly positioned radially inward of the outer foil;
• and
• an inner foil assembly positioned radially inward of the bump foil assembly and secured to the outer foil, the inner foil assembly comprising an inner foil extending circumferentially from a first inner foil end to a second inner foil end, and a second anti-rotation tab at the second inner foil end that is received by the slot to limit circumferential movement of the inner foil relative to the bearing housing in a second direction opposite the first direction, wherein the first inner foil end is attached to the outer foil proximate the first outer foil end by welding or brazing.