Variable vane arm/unison ring attachment system
View Patent ↗An attachment system for use with a variable incidence vane is disclosed. The attachment system includes a vane arm for joining a unison ring to a vane spindle. The vane arm has an arm portion and a bushing connected to the arm portion. The attachment system further has a pin for joining the vane arm to the unison ring. The pin fits within an interior bore in the bushing and is joined to the unison ring by a dual swage.
1. An attachment system for use with a variable incidence vane system comprising:
a vane arm for connecting a unison ring and a spindle;
said vane arm having an arm portion and a bushing connected to said arm portion;
a pin for connecting said vane arm to said unison ring; and
said pin fitting within said bushing and being joined to said unison ring by a dual swage.
2. The attachment system according to claim 1 , wherein said bushing is connected to said arm portion by brazing.
3. The attachment system according to claim 1 , wherein said bushing has no chamfered reliefs.
4. The attachment system according to claim 1 , further comprising said vane arm having means for connecting said vane arm to said vane spindle.
5. The attachment system according to claim 4 , wherein said connecting means comprises a claw having a tapered leading edge.
6. The attachment system according to claim 5 , wherein said vane spindle has two offset slots and said connecting means further comprises first and second curved members for engaging said slots.
7. The attachment system according to claim 6 , wherein said first curved member has a first radius of curvature, said second curved member has a second radius of curvature, and said first radius of curvature is different from said second radius of curvature.
8. A vane arm for use in an attachment system having a unison ring comprising:
an arm portion and a bushing connected to said arm portion;
said arm portion having a thickness;
said bushing having a height which is maximized to fit within a cross section of the unison ring with a clearance between top and bottom surfaces of said bushing sufficient to eliminate any potential for contact and subsequent wear of said top and bottom surfaces;
a tapered claw structure for joining said vane arm to another structure; and
said tapered claw structure including a tapered leading edge.
9. A vane arm according to claim 8 , wherein said tapered claw structure includes a first curved member having a first radius of curvature, a second curved member having a second radius of curvature, and said first radius of curvature being different from said second radius of curvature.
10. A vane arm for use in a gas turbine engine comprising an arm portion, a bushing at a first end of said arm portion, and an integrally formed tapered claw feature at a second end of said arm portion, and said claw feature comprising a first curved member having a tapered leading edge and a second curved member having a tapered leading edge.
11. A vane arm according to claim 10 , wherein said first curved member has a first radius of curvature, said second curved member having a second radius of curvature, and said first radius of curvature is different from said second radius of curvature.