In situ balancing mass(es) for aircraft powerplant

An apparatus for an aircraft powerplant, comprising:

• a rotating structure configured to rotate about an axis, the rotating structure including a shaft, a retainer, a balancing device and a bladed rotor connected to the shaft;
• the shaft including a bore, a plurality of shaft teeth and a shoulder axially along the bore;
• the retainer disposed in the bore and mounted to the shaft;
• the balancing device configured to rotationally balance the rotating structure about the axis, the balancing device disposed in the bore and axially retained between the shoulder and the retainer, and the balancing device comprising a balancing mass;
• and
• the balancing mass including a mass ring, a mass weight and a plurality of mass teeth, the mass ring extending circumferentially about the axis between opposing circumferential ends of the balancing mass, the mass weight projecting radially inward from the mass ring, the plurality of mass teeth arranged circumferentially about the axis and projecting radially out from the mass ring, and the plurality of mass teeth meshed with the plurality of shaft teeth.

An apparatus for an aircraft powerplant, comprising:

• a rotating structure configured to rotate about an axis, the rotating structure including a shaft, a retainer, a balancing device and a bladed rotor connected to the shaft;
• the shaft including a bore and a shoulder with a plurality of shaft teeth;
• the retainer disposed in the bore and mounted to the shaft;
• the balancing device configured to rotationally balance the rotating structure about the axis, the balancing device disposed in the bore and axially retained between the shoulder and the retainer, and the balancing device comprising a balancing mass and a spring element that is located axially between and engaged with the balancing mass and the retainer;
• and
• the balancing mass including a mass ring, a mass weight and a plurality of mass teeth, the mass ring extending circumferentially around the axis, the mass weight projecting radially inward from the mass ring, the plurality of mass teeth arranged circumferentially about the axis and projecting axially out from the mass ring, and the plurality of mass teeth meshed with the plurality of shaft teeth.