Intershaft integrated seal and lock-nut

An intershaft integrated seal and lock-nut assembly comprising:

• axially spaced apart forward and aft shafts,
• a forward lock-nut threaded onto an aft end of the forward shaft,
• an aft lock-nut threaded onto a forward end of the aft shaft, and
• a seal ring sealingly engaging and disposed between the forward and aft lock-nuts and operable to seal an annular gap between forward and aft shafts, further comprising:
• the seal ring disposed in the annular ring groove extending radially inwardly into the forward lock-nut,
• the aft lock-nut including a forwardly extending annular arm having an annular cylindrical inner surface surrounding the annular ring groove, and
• the annular cylindrical inner surface being operable to seal against the seal ring.

An intershaft integrated seal and lock-nut assembly comprising:

• axially spaced apart forward and aft shafts,
• a forward lock-nut threaded onto an aft end of the forward shaft,
• an aft lock-nut threaded onto a forward end of the aft shaft, and
• a seal ring sealingly engaging and disposed between the forward and aft lock-nuts and operable to seal an annular gap between forward and aft shafts, further comprising:
• forward and aft retention tabbed rings engaging the forward and aft lock-nuts and the forward and aft shafts respectively,
• forward and aft snap rings disposed in radially inwardly open annular forward and aft grooves in the lock-nuts respectively, and
• the forward and aft snap rings engaging the forward and aft retention tabbed rings and the forward and aft lock-nuts respectively.

An intershaft integrated seal and lock-nut assembly comprising:

• axially spaced apart forward and aft shafts,
• a forward lock-nut threaded onto an aft end of the forward shaft,
• an aft lock-nut threaded onto a forward end of the aft shaft, and
• a seal ring sealingly engaging and disposed between the forward and aft lock-nuts and operable to seal an annular gap between forward and aft shafts, further comprising:
• the seal ring disposed in the annular ring groove extending radially inwardly into the aft lock-nut,
• the forward lock-nut including an aftwardly extending annular arm having an annular cylindrical inner surface surrounding the annular ring groove, and
• the annular cylindrical inner surface operable to seal against the seal ring.

A gas turbine engine assembly comprising:

• axially spaced apart power output and stub shafts,
• the power output connected to a low pressure drive shaft connected to a low pressure turbine,
• the stub shaft connected to a high pressure rotor including a high pressure turbine and rotatably supported by a first bearing,
• a horizontal bevel gear and a ball bearing inner race of the a first bearing mounted on the stub shaft,
• a high pressure lock-nut threaded on forward threads on a forward end of the stub shaft,
• the high pressure lock-nut axially securing the horizontal bevel gear and the ball bearing inner race on the stub shaft,
• an aft power shaft lock-nut threaded on aft threads on an aft end of the power output shaft axially securing a roller bearing inner race of the output shaft bearing to the power output shaft, and
• a seal ring sealingly engaging and disposed between the aft power shaft lock-nut and the high pressure lock-nut and operable to seal an annular gap between the power output shaft and the stub shaft.