Resonator, and an aircraft provided with the resonator

Patent metadata

Field	Value
Publication number	US-2018022447-A1
Application number	US-201715646423-A
Country	US
Kind code	A1
Filing date	Jul 11, 2017
Priority date	Jul 19, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

A resonator provided with a heavy member comprising a casing fastened a spring blade. The heavy member comprises a set of masses that is movable in translation in said casing along a longitudinal direction. A wormscrew driven by drive means is engaged in a slider nut of said set of masses. The set of masses comprises two masses that are slidable respectively in two cylindrical spaces of the casing. Each mass presents at least two presser means interposed between the mass and the casing, each presser means comprising a groove formed in a circumference of a mass, each presser means comprising at least one resilient member arranged in said groove and a split ring pressed against the casing by said at least one resilient member of the presser means.

First claim

What is claimed is:

1 . A resonator having a heavy member and a spring blade, the heavy member comprising a casing fastened to the spring blade, the heavy member further comprising a set of masses that is movable in translation inside the casing along a longitudinal direction, the resonator including a wormscrew engaged in a slider nut of the set of masses, the resonator including drive means suitable for driving the wormscrew in rotation so that rotation of the wormscrew drives the movement in translation, wherein the casing presents an inside face defining in part at least two cylindrical spaces each presenting a generator line parallel to the longitudinal direction, the two cylindrical spaces being arranged outside a central space, the wormscrew being arranged in the central space, the set of masses comprising two masses slidable respectively in the two cylindrical spaces, the set of masses including a support carrying the slider nut, each mass comprising at least one heavy element fastened to the support, each mass presenting at least two presser means interposed between the mass and the inside face, each presser means comprising a groove formed in a circumference of a mass and contained in a plane perpendicular to the longitudinal direction, each groove describing a closed curve, each presser means comprising at least one resilient member arranged in the groove and a split ring pressed against the inside face by the at least one resilient member of the presser means, the split ring projecting in part from the groove.

2 . The resonator according to claim 1 , wherein the two masses are identical and arranged transversely in symmetrical manner on either side of a plane of symmetry containing the longitudinal direction.

3 . The resonator according to claim 1 , wherein at least one presser means comprises two resilient members exerting force on a single split ring.

4 . The resonator according to claim 1 , wherein at least one split ring extends between two ends that are circumferentially separated by a slot, the slot extending in a direction that is not parallel to the longitudinal direction.

5 . The resonator according to claim 1 , wherein the support includes a central portion carrying the slider nut and two side branches extending transversely on either side of the central portion, the two masses being fastened respectively to the two side branches.

6 . The resonator according to claim 5 , wherein the central portion extends transversely between two side faces, the two side faces respectively facing the two masses, each presser means of a mass being arranged facing a side face, each side face defining part of one of the cylindrical spaces.

7 . The resonator according to claim 1 , wherein at least one cylindrical space is in the shape of a cylinder of circular base.

8 . The resonator according to claim 1 , wherein at least one mass comprises two distinct heavy elements, the two heavy elements being fastened longitudinally on either side of a side branch of the support, each heavy element carrying respective presser means.

9 . The resonator according to claim 8 , wherein the two heavy elements are identical.

10 . The resonator according to claim 8 , wherein the two heavy elements are different, the two heavy elements extending longitudinally over two respective distances that are different.

11 . The resonator according to claim 1 , wherein the casing is made out of a material presenting density that is less than the density of a material forming the set of masses.

12 . The resonator according to claim 1 , wherein at least one resilient member is a gasket constrained by the groove to exert a force in radial directions against the corresponding split ring.

13 . The resonator according to claim 12 , wherein the groove presents an inner space containing the gasket, the inner space extending longitudinally over a groove length and radially over a groove depth, the gasket extending longitudinally over a gasket length and radially over a gasket thickness, and the gasket thickness is greater than the groove depth.

14 . The resonator according to claim 1 , wherein the groove presents an inner space containing the gasket, the inner space extending longitudinally over a groove length and radially over a groove depth, the gasket extending longitudinally over a gasket length and radially over a gasket thickness, and the gasket length at rest is less than the groove length.

15 . The resonator according to claim 1 , wherein the inside face is covered in lubricant.

16 . The resonator according to claim 1 , wherein the groove presents an inner space containing the gasket and an outer space, the outer space surrounding the inner space and containing the split ring in part, the inner space extending longitudinally along an inner length that is less than an outer length along which the outer space extends.

17 . An aircraft, wherein the aircraft includes the resonator according to claim 1 .

Assignees

• Airbus Helicopters

Inventors

• Bocoviz Claude
• Ecard Valentin
• Inquiete Guillaume
• Eberhard Alain
• Tailland Laurine

Classifications

• F16F7/104

  the inertia member being resiliently mounted {(F16F7/1022 takes precedence)} · CPC title

• F16F2230/0011

  Balancing, e.g. counterbalancing to produce static balance · CPC title

• B64C2027/002

  mounted between the rotor drive and the fuselage · CPC title

• F16F7/1005

  characterised by active control of the mass · CPC title

• B64C27/001 Primary

  Vibration damping devices · CPC title