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:
Mar. 03, 2026
Filed:
Mar. 06, 2025
Rolls-royce Plc, London, GB;
Mark Spruce, Derby, GB;
ROLLS-ROYCE plc, London, GB;
Abstract
Gas turbine engine for aircraft includes: an engine core including a turbine, compressor, and core shaft; a fan located upstream of the core; and a gearbox for receiving input from the core shaft, and outputting drive to a fan shaft via an output of the gearbox. A fan-gearbox axial distance is an axial distance between an axial position of the gearbox output position and the fan axial centreline. The fan-gearbox axial distance multiplied by a moment of inertia of the fan may range from 1.9×10kgmmm to 6.2×10kgmmm and/or the fan-gearbox axial distance divided by a moment of inertia of the fan may range from 5.3×10m/kgmmto 8.8×10m/kgmm. A product of:(the radial bending stiffness of the fan shaft at the output of the gearbox)×(the moment of inertia of the fan)may be range from 2.0×10Nkgmmmto 1.4×10Nkgmmm.