The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2008
Filed:
Oct. 26, 2005
Christopher Wright, Bristol, GB;
Gervas Franceschini, Exeter, GB;
Christopher Wright, Bristol, GB;
Gervas Franceschini, Exeter, GB;
Rolls-Royce PLC, London, GB;
Abstract
This invention provides a segmented annular seal () the sealing leakage gaps between relatively movable componentsbetween high and low pressure regions in a gas turbine engine, for example for sealing an engine shaft. The seal comprises an annular array of circumferentially spaced and radially movable arcuate seal segments () which extend in a continuous end to end relationship in annular housing () and project radially from the housing for effecting a seal against an engine shaft (), rotor or the like. The segments () are located in a channel () in the housing () sized such that the segments () are able to follow radial movements of the shaft (). In order to reduce an axial loading on the segments () that ends to cause them to seize a pressure balance region () vented to the upstream pressure region is formed on the downstream side of the segments (). A second pressure balance region () vented to the downstream pressure region may be formed on the upstream side of the segments () to relieve a twisting moment acting on the segments.