Patent Number: 6,254,344

Title: Seal

Abstract: An annular seal comprising a mass of bristles (10) packed together in a layer axially adjacent to an annular backing plate (12). The bristles (12) and backing plate (14) are mounted on and extend from a radially outer member (4) towards and around a cylindrical inner member (2). The outer (4) and inner (2) cylindrical members rotate relative to each other about an axis (1). The bristles (10) co-operate with the inner cylindrical member (2) to form a seal thereagainst. An expansion ring (18) is disposed radially inwardly of the backing plate (14) and is mounted in substantially the same plane from the backing plate (14) via a suitable mounting arrangement (16) which is arranged to permit radial movement of the expansion ring (18) relative to the backing plate (14) and the operational position of the inner cylindrical member (2). Frictional heating of the expansion ring (18) when the expansion ring (18) is in contact with and the inner cylindrical member (2) is arranged to cause the expansion ring (18) to expand radially away from the inner cylindrical member (2). The mounting arrangement (18) is resilient and comprises an annular spring with substantially U shaped circumferential cross section.

Inventors: Wright; Christopher (Bristol, GB), Allen; Steven V (Bristol, GB), Saysell; Guy (Chepstow, GB), Morgan; Jonathan J (Oxford, GB)

Assignee: Rolls-Royce plc

International Classification: F16J 15/32 (20060101); F01D 011/00 (); F16J 015/16 ()

Expiration Date: 07/03/2018