Hole liners for repair of vane counterbore holes
First Claim
1. A vane shroud for a gas turbine engine, the vane shroud comprising:
- a cylindrical shaped body;
a hole arranged at a circumference of the body, wherein the hole is for receiving a trunnion from a variable vane;
a counterbore arranged concentrically around the hole on a radially inward facing surface of the body, wherein the counterbore is for receiving a hub from the variable vane;
a recess positioned on a radially inward facing surface of the counterbore;
a liner inserted into the hole and counterbore such that the trunnion and hub are provided with a contact surface; and
an anti-rotation feature positioned on a radially outward facing surface of the liner for insertion into the recess.
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Accused Products
Abstract
A variable vane shroud for a gas turbine engine comprises a cylindrically shaped body, a hole arranged at a circumference of the body, and a counterbore arranged concentrically around the hole on a radially inward facing surface of the body. The hole is for receiving a trunnion from a variable vane and the counterbore is for receiving a hub from the variable vane. A liner is inserted into the hole and counterbore such that the trunnion and hub are provided with a contact surface. The invention also provides a method for repairing a damaged counterbore in a variable vane shroud. A liner having a shape corresponding to a layer of material removed from the shroud is inserted into the void left by removing damaged material such that the counterbore is restored to pre-damaged dimensions.
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Citations
25 Claims
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1. A vane shroud for a gas turbine engine, the vane shroud comprising:
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a cylindrical shaped body; a hole arranged at a circumference of the body, wherein the hole is for receiving a trunnion from a variable vane; a counterbore arranged concentrically around the hole on a radially inward facing surface of the body, wherein the counterbore is for receiving a hub from the variable vane; a recess positioned on a radially inward facing surface of the counterbore; a liner inserted into the hole and counterbore such that the trunnion and hub are provided with a contact surface; and an anti-rotation feature positioned on a radially outward facing surface of the liner for insertion into the recess. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for repairing a damaged counterbore in a variable vane shroud, the method comprising:
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removing a layer of base material from the vane shroud around the counterbore to produce a socket such that a damaged portion of the counterbore is removed; and inserting a liner having a shape corresponding to the layer of base material removed from the shroud into the socket such that the counterbore is restored to pre-damaged dimensions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A liner for receiving a trunnion of a variable vane in a compressor fan case, the liner comprising:
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a generally flat floor comprising; a first surface for abutting a base of the trunnion; and a second surface for abutting the compressor fancase; a wall portion surrounding a perimeter of the floor and extending from the first surface, wherein the wall is shaped to match a contour of a radially inward facing surface of the fan case; a neck portion extending from the second surface and surrounding a hole in a center of the floor, wherein the hole is for receiving the trunnion; and an anti-rotation button protruding from the second surface so as to be configured for insertion into a mating locating recess in the fan case. - View Dependent Claims (23, 24, 25)
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Specification