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A support arrangement for a unison ring in a system for varying the angles of attack of compressor vanes in an axial flow gas turbine engine compressor. The support arrangement includes a plurality of struts which provide radial support for the unison ring on the compressor case and a corresponding

A support arrangement for a unison ring in a system for varying the angles of attack of compressor vanes in an axial flow gas turbine engine compressor. The support arrangement includes a plurality of struts which provide radial support for the unison ring on the compressor case and a corresponding plurality of eccentric washers disposed between platforms on the struts and an overhanging flange on the unison ring. When the washers are rotated, the positions of the struts are adjusted radially and when the washers and struts are clamped to the unison ring, forces are reacted between the struts and the unison rings through the washers.

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In a gas turbine engine having a stage of variable geometry compressor vanes on a generally cylindrical compressor case of said engine centered on a main axis of said engine and a unison ring around said compressor case for setting the angle of attack of each compressor vane in said stage, a unison

In a gas turbine engine having a stage of variable geometry compressor vanes on a generally cylindrical compressor case of said engine centered on a main axis of said engine and a unison ring around said compressor case for setting the angle of attack of each compressor vane in said stage, a unison ring mounting arrangement comprising: means on said unison ring defining an end face in a plane generally perpendicular to said main axis, means on said unison ring defining an overhanging flange at a radially outer extremity of said end face extending beyond the plane thereof, a strut including a bearing surface at a radially inboard end thereof and a planar mounting tab at a radially outboard end thereof having a ring side and a washer side, means on said strut defining a platform thereon said washer side of said mounting tab, said ring side of said mounting tab being disposed against said unison ring with said bearing surface thereon adjoining a bearing surface on said compressor case and with said platform generally parallel to said overhanging flange, eccentric flat washer means abutting said washer side of said mounting tab between said platform on said strut and said overhanging flange on said unison ring and engageable on each to vary the distance between said platform and said overhanging flange when said flat washer means is rotated while abutting said washer side of said mounting tab, and clamping means on said unison ring operative to clamp said eccentric flat washer means against said mounting tab and said mounting tab against said unison ring so that the relative position of said strut is captured and said eccentric flat washer reacts loads directly between said platform and said overhanging flange.