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:
Oct. 09, 2018
Filed:
Jan. 30, 2013
Pratt & Whitney Canada Corp., Longueuil, CA;
Richard Ullyott, St Bruno, CA;
Keith Morgan, Westmount, CA;
Jean Dubreuil, Boucherville, CA;
Lazar Mitrovic, Longueuil, CA;
Kevin A. Dooley, Mississauga, CA;
Stephen Kenny, Caledon Village, CA;
Ilya Medvedev, St. Petersburg, RU;
Johnny Vinski, Chateauguay, CA;
PRATT & WHITNEY CANADA CORP., Longueuil, QC, CA;
Abstract
A multi spool gas turbine engine with a differential having a selectively rotatable member which rotational speed determines a variable ratio between rotational speeds of driven and driving members of the differential. The driven member is engaged to the first spool and a rotatable shaft independent of the other spools (e.g. connected to a compressor rotor) is engaged to the driving member. First and second power transfer devices are engaged to the first spool and the selectively rotatable member, respectively. A circuit interconnects the power transfer devices and allows a power transfer therebetween, and a control unit controls the power being transferred between the power transfer devices. Power can thus be transferred between the first spool and the selectively rotatable member to change the speed ratio between the first spool and the rotatable shaft.