Variable turbine vane actuation mechanism having a bumper ring
First Claim
1. A variable vane actuation assembly for gas turbine engine having a turbine section with a plurality of rotatable stator vanes, the variable vane actuation assembly comprising:
- an engine casing configured to encase the plurality of rotatable stator vanes;
a unison ring disposed concentrically with the engine casing;
a bumper ring disposed concentrically between the engine casing and the unison ring;
a radial spline connection extending from the engine casing and joining with the bumper ring, wherein the radial spline connection permits the bumper ring to float radially with respect to the engine casing, but prevents the bumper ring from rotating circumferentially with respect to the engine casing; and
a plurality of bumper shims positioned between the unison ring and the bumper ring to limit deformation of the unison ring.
4 Assignments
0 Petitions
Accused Products
Abstract
A variable vane actuation assembly for gas turbine engines having rotatable stator vanes comprises an engine casing, a unison ring, a bumper ring, a radial spline connection and a plurality of bumper shims. The engine casing is configured to encase the rotatable stator vanes. The unison ring is disposed concentrically with the engine casing. The bumper ring is disposed concentrically between the engine casing and the unison ring. The radial spline connection extends from the engine casing and joins with the bumper ring to permit the bumper ring to float radially with respect to the engine casing, but prevent the bumper ring from rotating circumferentially with respect to the engine-casing. The plurality of bumper shims are positioned between the unison ring and the bumper ring to limit deformation of the unison ring.
-
Citations
22 Claims
-
1. A variable vane actuation assembly for gas turbine engine having a turbine section with a plurality of rotatable stator vanes, the variable vane actuation assembly comprising:
-
an engine casing configured to encase the plurality of rotatable stator vanes; a unison ring disposed concentrically with the engine casing; a bumper ring disposed concentrically between the engine casing and the unison ring; a radial spline connection extending from the engine casing and joining with the bumper ring, wherein the radial spline connection permits the bumper ring to float radially with respect to the engine casing, but prevents the bumper ring from rotating circumferentially with respect to the engine casing; and a plurality of bumper shims positioned between the unison ring and the bumper ring to limit deformation of the unison ring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A bumper assembly for a variable vane actuation mechanism, the bumper assembly comprising:
-
an annular engine casing configured to enshroud outer diameter ends of variable vanes; projections extending radially from the engine casing to form an annular array; a bumper ring comprising; an annular body concentrically positioned with the annular array of projections; and receptacles for receiving the projections; an annular unison ring comprising; a first circumferential surface for engaging the bumper ring; and bores for connecting with actuation arms of the variable vanes; and bumper shims positioned on the first circumferential surface between the bores, and between the first circumferential surface and the bumper ring such that the bumper shims inhibit deformation of the unison ring. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for maintaining circularity of a unison ring in a variable vane assembly of a gas turbine engine, the method comprising the steps of:
-
forming a plurality of projections on an engine casing that extend in a radial direction; positioning a bumper ring having a plurality of radial openings between the engine casing and the unison ring such that the plurality of projections engage the plurality of radial openings; positioning a bumper shim between the unison ring and the bumper ring; thermally deforming the engine casing, the unison ring and the bumper ring during operation of the gas turbine; and floating the bumper ring on the plurality of projections such that the bumper shim engages the unison ring to maintain circularity of the unison ring, and to prevent binding of the unison ring with the engine casing. - View Dependent Claims (21, 22)
-
Specification