Multi-material bushing for rotatably mounting a rotating structure to a stationary structure

An assembly for a gas turbine engine, comprising:

• a rotating structure extending axially along and rotatable about a centerline;
• a stationary structure extending circumferentially about the rotating structure, the stationary structure comprising stationary structure material with a coefficient of thermal expansion between 10 μin/in-° F. and 15 μin/in-° F.;
• and
• a bushing radially between the rotating structure and the stationary structure, the bushing including a mount and a bearing within the mount, the mount comprising mount material with a coefficient of thermal expansion between 9 μin/in-° F. and 10 μin/in-° F., the mount material contacting the stationary structure material, the bearing comprising bearing material engaged with and rotatably supporting the rotating structure, and the bearing material comprising copper;
• wherein the bearing material contacts and is bonded to the mount material.

An assembly for a gas turbine engine, comprising:

• a rotating structure extending axially along and rotatable about a centerline;
• a stationary structure circumscribing the rotating structure, the stationary structure comprising at least one of aluminum or magnesium;
• and
• a bushing rotatably coupling the rotating structure to the stationary structure, the bushing including a mount and a bearing within the mount, the mount comprising stainless steel that contacts the at least one of the aluminum or the magnesium, and the bearing comprising leaded bronze that is engaged with and rotatably supports the rotating structure;
• wherein the bushing further includes a sleeve radially between the mount and the bearing;
• and
• wherein the sleeve comprises plain carbon steel contacting the stainless steel and the leaded bronze.