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:
Jul. 21, 2026
Filed:
May. 09, 2025
Pratt & Whitney Canada Corp., Longueuil, CA;
Dave Menheere, Norval, CA;
Russell Stratton, Toronto, CA;
Pratt & Whitney Canada Corp., Longueuil, CA;
Abstract
An aircraft propulsion system includes a gearbox including an input shaft, an output shaft, an epicyclic gear arrangement, a drive gear, a layshaft assembly, and a rotational control device. The epicyclic gear arrangement includes a sun gear, planet gears, a ring gear, and a carrier. The sun gear is connected with the drive gear. The planet gears are engaged with the sun gear and the ring gear. The carrier is mounted on planet gears and connected to the output shaft. The layshaft assembly extends along an axis. The layshaft assembly is engaged with the drive gear and the input shaft. The rotational control device includes a drive assembly coupled with the layshaft assembly. The drive assembly includes a ring gear drive. The ring gear drive is rotatable about the axis. The drive assembly is configured to drive rotation of the ring gear with the ring gear drive.