Control lever for the pitch angle of a blade in a turbomachine
View Patent ↗A control lever for the pitch angle of a blade in a turbomachine, said lever having a first end intended to be mounted on a blade pivot so as to rotate it and a second end comprising a cylindrical peg for mounting on a control annulus, this peg being fixed by crimping of one of its ends in an orifice of the second end of the lever and comprising an annular flange to which is applied the second end of the lever, wherein stress distribution means are interposed between the second end of the lever and the crimped end of the peg.
1. A control lever for the pitch angle of a blade in a turbomachine, said lever comprising:
a first end configured to be mounted on a blade pivot so as to rotate it and a second end carrying a cylindrical peg configured to mount on a control annulus, this peg being fixed by crimping of one of its ends in an orifice of the second end of the lever and including an annular flange to which is applied the second end of the lever, wherein stress distribution means are sandwiched between the second end of the lever and the crimped end of the peg.
2. The control lever as claimed in claim 1 , wherein the stress distribution means comprise a washer.
3. The control lever as claimed in claim 2 , wherein the washer is made of a more flexible material than that of the control lever.
4. The control lever as claimed in claim 3 , wherein the washer is made of polymer.
5. The control lever as claimed in claim 2 , wherein the washer is made of a harder material than that of the control lever.
6. The control lever as claimed in claim 5 , wherein the washer is made of polymer or of metal.
7. The control lever as claimed in claim 5 , wherein the washer comprises a substantially plane annular surface applied to the second end of the lever and exhibiting a convex or chamfered annular edge at its outer periphery.
8. The control lever as claimed in claim 2 , wherein the thickness of the washer is about one millimeter.
9. The control lever as claimed in claim 2 , wherein the washer has an outer diameter equal to or slightly less than that of the flange of the peg.
10. The control lever as claimed in claim 2 , wherein a first side of the washer is in direct contact with a first surface of the lever, and a second surface of the lever opposite the first surface of the lever is in direct contact with the annular flange.
11. The control lever as claimed in claim 10 , wherein a second side of the washer opposite the first side of the washer is in direct contact with the crimped end of the peg.
12. The control lever as claimed in claim 2 , wherein the crimped end of the peg contacts the washer along a surface of the crimped end extending in a direction perpendicular to an axis of the peg.
13. The control lever as claimed in claim 1 , wherein the lever is made of titanium and the peg is made of steel.
14. The control lever as claimed in claim 1 , wherein an inner surface of the orifice in the second end of the lever is in direct contact with the peg.