US 11,708,792 B2
Twin-engine system with electric drive
Guy Lefebvre, St-Bruno-de-Montarville (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on May 31, 2022, as Appl. No. 17/804,631.
Application 17/804,631 is a continuation of application No. 16/875,470, filed on May 15, 2020, granted, now 11,408,340.
Prior Publication US 2023/0064177 A1, Mar. 2, 2023
Int. Cl. F02C 6/20 (2006.01); B64D 35/08 (2006.01); F02C 7/32 (2006.01); B64D 27/02 (2006.01); B60K 25/00 (2006.01); B60K 6/26 (2007.10)
CPC F02C 6/20 (2013.01) [B64D 35/08 (2013.01); F02C 7/32 (2013.01); B60K 2006/266 (2013.01); B60K 2025/005 (2013.01); B64D 2027/026 (2013.01); F05D 2220/329 (2013.01); F05D 2220/70 (2013.01); F05D 2220/76 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A twin-engine system, comprising:
a gas turbine engine comprising a core and a first output shaft drivable by the core;
an electric engine having an electric motor configured to drive a second output shaft about an axis;
a reduction gearbox (RGB) having an RGB input drivingly engaged to both the first output shaft and the second output shaft, the RGB having a first RGB output to provide rotational output to a rotatable load;
an electric generator electrically connected to the electric engine, the electric generator mechanically connected to the gas turbine engine via the RGB;
a primary accessory gearbox (AGB) drivingly connected to the gas turbine engine; and
a secondary AGB drivingly connected to the electric engine and to the primary AGB;
wherein the electric engine and the electric generator are axially disposed in series between the RGB and the secondary AGB.