Abstract: A damper ring is mounted in frictional engagement with a radially inwardly facing surface of a circumferential groove defined in a rotary part of a gas turbine engine. Energy dissipation is provided via sliding friction of the ring in the groove. The damper ring has a circumferentially segmented ring body having a non-uniform circumferential stiffness around its circumference including a locally reduced stiffness in a circumferential direction between each pair of circumferentially adjacent ring segments.

Abstract: A gearbox in a gas turbine engine includes an enclosed gearbox housing, at least a pair of intermeshing gears lubricated and rotatably supported within the gearbox housing, and a baffle apparatus axially spaced apart from and positioned at least at one side of the pair of gears, the baffle apparatus including a collector defining a main opening adjacent a meshing point of the intermeshing gears for collecting and redirecting lubricant squeezed out axially from the intermeshing gears.