Damping device for a supercritical transmission shaft

Patent metadata

Field	Value
Publication number	US-9677607-B2
Application number	US-201514595574-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A damping device for a shaft in rotation around an axis of rotation parallel to a direction (A). The said damping device includes a support, a plate, a collar, and clamping means. The said support is stationary and is provided with a first opening, with the said plate being provided with a second opening and the said collar being provided with a third opening. The said shaft passes simultaneously through the said first, second, and third openings with, respectively, a first radial gap, a second radial gap, and a third radial gap, with the said third radial gap being smaller than the said first and second radial gaps. The said collar is movable with respect to the said support in a plane perpendicular to the said direction (A), with the said clamping means pressing the said plate against the said collar and the said collar against the said support.

First claim

What is claimed is:

1. A damping device for a shaft in rotation around an axis of rotation parallel to a direction with respect to a structure, with the damping device comprising:
a support suitable for forming an integral part of the structure, with the support being provided with a first opening positioned perpendicular to the direction, and
a plate provided with a second opening positioned perpendicular to the direction, with the shaft being suitable for passing simultaneously through the first opening and the second opening, with, respectively, a first radial gap with the support and a second radial gap with the plate;
a collar provided with a third opening positioned perpendicular to the direction, with the collar being positioned between the support and the plate and being movable with respect to the support in a plane perpendicular to the direction, with the shaft being suitable for passing through the third opening, with a third radial gap with the collar, with the third radial gap being smaller than the first radial gap and the second radial gap; and
clamping means that press, parallel to the direction, the plate in direct frictional contact with the collar and the collar in direct frictional contact with the support;
wherein the damping device includes elastic centering means positioned radially around the collar; and
wherein the elastic centering means consist of an elastic return ring positioned radially around the collar to re-center the collar.

2. The damping device according to claim 1 , wherein the third radial gap is between 1 and 8 mm.

3. The damping device according to claim 1 , wherein the clamping means include at least one elastic deformable means.

4. The damping device according to claim 3 , wherein the clamping means include three compression springs.

5. The damping device according to claim 1 , wherein said collar is made of a polyamide-imide thermoplastic.

6. The damping device according to claim 1 , wherein the support and the plate are metallic.

7. The damping device according to claim 6 , wherein the support and the plate are made of aluminum.

8. The damping device according to claim 6 , wherein the support and the plate are made of steel.

9. The damping device according to claim 1 , wherein the elastic centering means are positioned between the collar and the plate.

10. The damping device according to claim 1 , wherein the elastic centering means are positioned between the collar and the support.

11. The damping device according to claim 1 , wherein the damping device is suitable for a supercritical shaft.

12. A mechanical transmission system that includes:
a structure;
a shaft in rotation around an axis of rotation parallel to a direction with respect to the structure; and
at least two bearings that are attached to the structure and that guide the shaft in rotation;
wherein the mechanical transmission system includes at least one damping device according to claim 1 .

13. The mechanical transmission system according to claim 12 , wherein the shaft is a supercritical shaft.

14. The mechanical transmission system according to claim 12 , wherein the structure is a tail boom of a rotary-wing aircraft, with the shaft being a transmission shaft that rotationally drives a rear rotor of the aircraft.

15. The mechanical transmission system according to claim 12 wherein the shaft in deformation comes into contact with the collar to displace the collar in in translation and in rotation; and
wherein the elastic centering means apply a radial restoring force that moves the collar toward the axis of rotation of the shaft to counteract friction forces during the displacement of the collar and to re-center the collar.

Assignees

• Airbus Helicopters

Inventors

• Nevers Romain
• Aubertin Ludovic
• Marchand Francois

Classifications

• F16C27/02 Primary

  Sliding-contact bearings · CPC title

• F16F15/021

  Decoupling of vibrations by means of point-of-contact supports, e.g. ball bearings · CPC title

• B64C27/14

  Direct drive between power plant and rotor hub · CPC title

• F16C2326/43

  Aeroplanes; Helicopters · CPC title

• F16F7/04

  in the direction of the axis of rotation {(F16F7/023 takes precedence)} · CPC title