Balancing device and method

Patent metadata

Field	Value
Publication number	US-10072729-B2
Application number	US-201514670227-A
Country	US
Kind code	B2
Filing date	Mar 26, 2015
Priority date	Sep 8, 2009
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A balancing method for a rotating part device including a nut having an internal thread, and a countersunk collar is disclosed. The countersunk collar has a through-hole with a diameter greater than the diameter of the internal thread of the nut. The countersunk collar includes a balancing weight.

First claim

The invention claimed is:

1. A method for balancing a rotating part comprising at a radial flange in a plane substantially perpendicular to an axis of rotation of said part, said radial flange comprising a plurality of substantially axial holes distributed around said axis of rotation, and a plurality of bolts, each bolt comprises a shank, the shank of each bolt passing through one of the holes and being retained by a nut having an internal thread engaging with an external thread of the shank, a countersunk collar attached to the nut and having a through-hole with a diameter greater than the shank being interposed between each nut and a radial surface of said flange, the method comprising:
providing a first nut with a first countersunk collar and a second nut with a second countersunk collar, the first and second nuts having a same weight;
determining an imbalance in the rotating part with the first nut on a first bolt and the second nut on a second bolt;
reducing the weight of the first countersunk collar relative to the second countersunk collar by machining of an outer radial thickness of said first countersunk collar; and
engaging the first nut on the first bolt and engaging the second nut of the second bolt such that a center of gravity of the rotating part is centered on said axis of rotation,
wherein, for each nut, the countersunk collar is separable from the nut, the countersunk collar includes a recess at an end thereof including an inclined centering surface and a radial surface connecting an end of the inclined centering surface and the through-hole, and the inclined centering surface of the countersunk collar contacts a corresponding inclined exterior surface of the nut in order to keep the countersunk collar centered relative to a longitudinal axis of the thread of the nut.

2. The method according to claim 1 , wherein the providing includes providing the first nut and the second nut having equal lengths.

3. The method according to claim 1 , wherein the providing includes providing the second nut with a total weight of 8 g.

4. The method according to claim 3 , wherein the providing includes providing the second nut with the second countersunk collar with a weight of 1.75 g.

Assignees

• Safran Aircraft Engines

Inventors

• Belmonte Olivier
• Galons Lucie

Classifications

• G01M1/04

  Adaptation of bearing support assemblies for receiving the body to be tested · CPC title

• G01M1/34

  by removing material from the body to be tested, e.g. from the tread of tyres · CPC title

• F16F15/322 Primary

  the rotating body being a shaft (F16F15/34, F16F15/36 take precedence) · CPC title

• F01D5/027

  Arrangements for balancing (for balancing rotating bodies in general F16F15/32; for compensating imbalance G01M1/36) · CPC title

• Y10T29/49948

  Multipart cooperating fastener [e.g., bolt and nut] · CPC title