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A generally wedge-shaped vibration damper for rotor blades of a gas turbine engine has a pair of scrubbing surfaces and is loosely retained in a pocket incorporated in the rotor blade platform. The pocket is partly defined by a plurality of surfaces which orient the damper so that it is slidably dis

A generally wedge-shaped vibration damper for rotor blades of a gas turbine engine has a pair of scrubbing surfaces and is loosely retained in a pocket incorporated in the rotor blade platform. The pocket is partly defined by a plurality of surfaces which orient the damper so that it is slidably displaceable and rotatable only in a predetermined plane. During rotation of the rotor disk, the damper of one rotor blade is displaced in a plane transverse to the rotor axis of rotation by centrifugal forces to a position at which one scrubbing surface of the damper abuts a side surface of the platform of the adjacent rotor blade and the other scrubbing surface abuts an inner surface of the platform of the rotor blade in which the damper is inserted. The scrubbing action of the damper serves to damp vibratory motion in the platforms of both blades.

대표청구항 ▼

A rotor blade for a rotor of an engine having an axis of rotation, comprising: a root portion, a platform portion connected to said root portion and having a pocket formed therein, an airfoil portion connected to said platform portion, a generally wedge-shaped damping member loosely arranged in said

A rotor blade for a rotor of an engine having an axis of rotation, comprising: a root portion, a platform portion connected to said root portion and having a pocket formed therein, an airfoil portion connected to said platform portion, a generally wedge-shaped damping member loosely arranged in said pocket and having first and second scrubbing surfaces disposed at a predetermined angle relative to each other, and means for orienting said wedge-shaped damping member such that said damping member is slidably displaceable and rotatable only in a predetermined plane during rotation of said rotor, said orienting means defining said pocket in part; and wherein said orienting means comprises first and second substantially mutually parallel planar surfaces axially located at first and second axial positions respectively, wherein each of said first and second substantially mutually parallel planar surfaces of said orienting means are integral with said platform portion and form a portion of said pocket, and said wedge-shaped damping member further comprises first and second substantially mutually parallel planar surfaces which are respectively oriented by contact with said first and second planar surfaces of said orienting means during displacement of said damping member under the influence of centrifugal forces.