Unison ring assembly

Patent metadata

Field	Value
Publication number	US-9970313-B2
Application number	US-201514716199-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	Jun 16, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A unison ring assembly comprises a backing plate, and a plurality of pocket-forming portions. The backing plate is formed as an annular disc, with the annular disc being planar in a radial plane of the unison ring assembly. The plurality of pocket-forming portions are equi-spaced circumferentially around the axis of the unison ring assembly, and each of the plurality of pocket-forming portions is attached to the backing plate to form a corresponding radially extending pocket.

First claim

What is claimed is:

1. A unison ring assembly comprising:
a plurality of lever arms;
a plurality of pitch change spindles;
a planar backing plate; and
a plurality of pocket-forming portions, wherein
the backing plate is formed as an annular disc, the annular disc being planar in a radial plane of the unison ring assembly,
each of the plurality of pocket-forming portions includes a circumferentially extending portion connecting two axially extending portions,
the plurality of pocket-forming portions are equi-spaced circumferentially around the axis of the unison ring assembly, and
each of the plurality of pocket-forming portions is attached to the backing plate, the backing plate being spaced from the circumferentially extending portion to form a corresponding radially outwardly opening pocket, with each pocket accommodating a respective one of the lever arms, and each lever arm being operably connected to a respective one of the pitch change spindles.

2. The unison ring assembly as claimed in claim 1 , wherein each of the plurality of pocket-forming portions is ‘C’-shaped in circumferential cross-section.

3. The unison ring assembly as claimed in claim 1 , wherein the plurality of pocket-forming portions is formed integrally.

4. The unison ring assembly as claimed in claim 3 , wherein the backing plate comprises a plurality of backing plate portions, each of the plurality of backing plate portions corresponding to a respective one of the pocket-forming portions.

Assignees

• Rolls Royce Plc

Inventors

• Beaven David Michael
• Mackie Kenneth John
• Stretton Richard Geoffrey

Classifications

• F01D17/10 Primary

  Final actuators (valves in general F16K {; blades with variable camber F01D5/148}) · CPC title

• F05D2260/79

  Bearing, support or actuation arrangements therefor · CPC title

• B64C11/306 Primary

  specially adapted for contrarotating propellers · CPC title

• F05D2220/36

  specially adapted for the fan of turbofan engines · CPC title

• F01D15/02

  Adaptations for driving vehicles, e.g. locomotives · CPC title