Shaft machining anti-vibration device

Patent metadata

Field	Value
Publication number	US-10195680-B2
Application number	US-201515303124-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Apr 8, 2014
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

An anti-vibration device for the machining of a shaft includes a first fixed ring intended to be kept inside a shaft by a shoulder, the anti-vibration device including: at least one first external groove and at least one first external seal for forming at least one contact with the internal surface of the shaft; at least one first internal circumferential groove and at least one first internal seal for forming at least one contact with the external surface of the bar; an internal circumferential cavity that is able to cause the circulation of a fluid arriving through a first duct and leaving through a second duct, the first duct and second duct passing through the radial thickness of the anti-vibration device, the internal circumferential cavity making it possible to realize a vibration-damping function when a fluid passes through it.

First claim

The invention claimed is:

1. An anti-vibration device for machining a hollow shaft, comprising a first element constructed and arranged to be maintained at least partially within the hollow shaft in a fixed position in relation to the hollow shaft and constructed and arranged to permit the guiding of a guide bar to move axially within the hollow shaft, the first element comprising:
at least one first mechanical vibration damper at an external periphery of the first element in relation to an internal surface of the hollow shaft and in contact with the internal surface;
at least one second mechanical vibration damper arranged at an internal diameter surface of the first element in relation to an external surface of the guide bar and in contact with it the external surface;
an internal circumferential cavity configured to circulate a fluid arriving via a first duct and exiting via a second duct, the first and second ducts passing through a radial thickness between the external periphery of the first element and the internal diameter surface of the first element, the internal circumferential cavity forming a hydraulic damper when a pressurized lubricating fluid flows through the first element.

2. The anti-vibration device for machining a hollow shaft according to claim 1 , wherein the first element is a first collar held fixed axially in relation to the hollow shaft by means of a shoulder, the anti-vibration device comprising:
at least one first external groove and at least one first external seal adapted to cooperate with the first external groove and forming the first mechanical vibration damper;
at least a first internal circumferential groove and at least one first internal seal adapted to cooperate with the first internal groove and forming the second mechanical vibration damper.

3. The anti-vibration device for machining a hollow shaft according to claim 2 , wherein the first internal circumferential groove and a second internal circumferential groove are each located close to the extremities of the first collar.

4. The anti-vibration device for machining a hollow shaft according to claim 3 , wherein the internal circumferential cavity extends longitudinally between:
a first extremity in proximity to the first internal circumferential groove;
a second extremity in proximity to the second internal circumferential groove.

5. The anti-vibration device for machining a hollow shaft according to claim 4 , wherein the first duct comprises:
a first elbowed opening permitting the passage of a fluid from the exterior of the anti-vibration device towards the internal circumferential cavity, the first elbowed opening comprising a longitudinal opening extending along the exterior surface of the first collar and a radial extension leading into the internal circumferential cavity in proximity to the first extremity of the internal circumferential cavity.

6. The anti-vibration device for machining a hollow shaft according to claim 5 , wherein the second duct comprises:
a second elbowed opening permitting the passage of a fluid from the internal circumferential cavity to the exterior of the anti-vibration device, the second elbowed opening comprising a radial opening in proximity to the second extremity of the internal circumferential cavity and a longitudinal prolongation passing through the shoulder so as to lead to the exterior of the anti-vibration device.

7. The anti-vibration device for the machining of a hollow shaft according to claim 1 , further comprising a second element constructed and arranged to be maintained at least partially to an exterior of a machining head and in a fixed position in relation to the machining head, the second element comprising:
at least a third mechanical vibration damper arranged at an external periphery of the second element in relation to the internal surface of the hollow shaft and making contact with the hollow shaft.

8. The anti-vibration device for machining a hollow shaft according to claim 7 , wherein the second element comprises an external groove and an external seal adapted to cooperate with the external groove of the second element and forming the third mechanical vibration damper.

9. The anti-vibration device for machining a hollow shaft according to claim 7 , wherein bodies of the first and/or second element are made from polyamide.

Assignees

• Safran Aircraft Engines

Inventors

• Dejaune Claude
• Douady Cyril

Classifications

• B23B41/02

  for boring deep holes; Trepanning, e.g. of gun or rifle barrels · CPC title

• B23B49/02

  Boring templates or bushings · CPC title

• B23D77/003 Primary

  with means for preventing chatter · CPC title

• B23B2250/16

  Damping of vibrations · CPC title

• B23B2250/12

  Cooling and lubrication · CPC title