Patent ID: 8727697
Filing Date: 2014-05-20
Classification: F01D,F04D,F05D

Abstract:
1. A variable vane actuation system comprising: a first ring member disposed for pivoting movement about a centerline axis and operably connected with at least one vane such that said at least one vane pivots in response to the pivoting movement of said first ring member; a first pin engaged with said first ring member; and a ring moving device operably engaged with said first pin to move said first ring member about said centerline axis, wherein said ring moving device includes at least one plate having a first slot and an actuator operable to move said at least one plate over a path of travel, said first pin received in said first slot and being a cam follower to a cam defined at least in part by a surface of said first slot; wherein said first slot extends along a path between first and second end points that is at least partially non-straight relative to a straight slot reference between said first and second end points; wherein the first slot includes a middle straight portion at an intermediate point and first and second straight end portions at the respective first and second end points, wherein at the intermediate point the angle between the middle straight portion and the centerline axis is decreased relative to the angle between the straight slot reference and the centerline axis, and at the first and second end points the angle between the first and second straight end portions and the centerline axis is increased relative to the angle between the straight slot reference and the centerline axis.