United Technologies Corporation

Robert J Kraft

Robert J McClelland

A rotor blade for a rotor assembly is provided which includes a root, an airfoil, a platform, and a damper. The airfoil includes at least one cavity. The platform extends laterally outward from the blade between the root and the airfoil, and includes an airfoil side, a root side, and an aperture extending between the root side of the platform and the cavity within the airfoil. The damper, which includes at least one bearing surface, is received within the aperture and the cavity. The bearing surface is in contact with a surface within the cavity and friction between the bearing surface and the surface within the cavity damps vibration of the blade.

Airfoil vibration damping device

A rotor blade for a rotor assembly is provided comprising a root, an airfoil, and a damper. The airfoil includes a base, a tip, a first cavity, a second cavity, and a passage. The passage includes a pair of walls converging from the first cavity to the second cavity, thereby connecting the first and second cavities. The damper is received within the passage. According to one aspect of the present invention, a difference in gas pressure across the damper biases the damper against the converging walls of the passage. According to another aspect of the present invention, centrifugal force biases the damper against the converging walls of the passage.

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Palm City, FL, United States of America

Robert J Kraft