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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.:

US 12631147 B1

PDFFull Text
Date of Patent:
May. 19, 2026

Filed:

Sep. 05, 2025

Aircraft engine

Applicant:

Rolls-royce Plc, London, GB;

Inventors:

Matthew Silvester, Derby, GB;

Geoffrey Hughes, Bristol, GB;

Assignee:

ROLLS-ROYCE PLC, London, GB;

Attorney:

Oliff PLC

Primary Examiner:

David P Olynick

Int. Cl.
CPC ...
F02C 7/36 (2006.01); B64D 27/10 (2006.01); F02C 3/073 (2006.01); F02K 3/06 (2006.01); F04D 25/02 (2006.01); F04D 29/40 (2006.01);
U.S. Cl.
CPC ...
F02C 7/36 (2013.01); B64D 27/10 (2013.01); F02C 3/073 (2013.01); F02K 3/06 (2013.01); F04D 25/02 (2013.01); F04D 29/40 (2013.01); F05D 2220/323 (2013.01); F05D 2220/36 (2013.01); F05D 2260/4031 (2013.01); F05D 2260/96 (2013.01);
Abstract

A gas turbine engine for an aircraft includes a fan system having a reverse travelling wave first flap mode, Fan RTW, and including a fan located upstream of the engine core; a fan shaft; and a front engine structure arranged to support the fan shaft and having a front engine structure nodding mode comprising a pair of modes at similar, but not equal, natural frequencies in orthogonal directions; and a gearbox. An LP rotor system including the fan system and a gearbox output shaft arranged to drive the fan shaft has a first reverse whirl rotor dynamic mode, Rotor RW, and a first forward whirl rotor dynamic mode, 1FW. The engine has a maximum take-off speed, MTO. A backward whirl frequency margin of: may be in the range from 15 to 50%.

Find Patent Forward Citations

Silvester, Matthew. (2026). Aircraft engine (U.S. Patent No. 12631147). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12631147

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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