Damping device for a supercritical transmission shaft

Patent metadata

Field	Value
Publication number	US-2016200429-A1
Application number	US-201514595574-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

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 said damping device including:
a support suitable for forming an integral part of the said structure, with the said support being provided with a first opening positioned perpendicular to the said direction, and a plate provided with a second opening positioned perpendicular to the said direction, with the said shaft being suitable for passing simultaneously through the said first opening and the said second opening, with, respectively, a first radial gap with the said support and a second radial gap with the said plate; a collar provided with a third opening positioned perpendicular to the said direction, with the said collar being positioned between the said support and the said plate and being movable with respect to the said support in a plane perpendicular to the said direction, with the said shaft being suitable for passing through the said third opening, with a third radial gap with the said collar, with the said third radial gap being smaller than the said first radial gap and the said second radial gap; and clamping means that press, parallel to the said direction, the said plate against the said collar and the said collar against the said support; wherein said damping device includes elastic centering means positioned radially around the said collar.

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

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

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

5 . The damping device according to claim 1 , wherein said collar is made of Torlon.®

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

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

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

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

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

11 . The damping device according to claim 1 , wherein said elastic centering means consist of an elastic return ring positioned radially around the said collar.

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

13 . 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 said structure; and at least two bearings that are attached to the said structure and that guide the said shaft in rotation; wherein said mechanical transmission system includes at least one damping device according to claim 1 .

14 . The mechanical transmission system according to claim 13 , wherein said shaft is a supercritical shaft.

15 . The mechanical transmission system according to claim 13 , wherein said structure is a tail boom of a rotary-wing aircraft, with the said shaft being a transmission shaft that rotationally drives a rear rotor of the said aircraft.

Assignees

• Airbus Helicopters

Inventors

• Nevers Romain
• Aubertin Ludovic
• Marchand Francois

Classifications

• F16F15/021

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

• B64C27/12

  Rotor drives · CPC title

• B64C27/001 Primary

  Vibration damping devices · CPC title

• B64C2027/002

  mounted between the rotor drive and the fuselage · CPC title

• F16C27/02 Primary

  Sliding-contact bearings · CPC title