| 主权项 |
1. An assembly, the assembly comprising:
a rotatable inner shaft; a rotatable outer shaft, wherein the rotatable inner shaft and the rotatable outer shaft are coaxial, and the rotatable inner shaft and the rotatable outer shaft both rotate relative to each other; an intershaft seal that is located in an annular space between the rotatable inner shaft and the rotatable outer shaft, wherein the intershaft seal maintains an axial pressure differential between a fluid pressure on a first side of the intershaft seal and a different fluid pressure on a second side of the intershaft seal, the intershaft seal including:
a first runner which extends circumferentially around one of the rotatable inner shaft and the rotatable outer shaft and projects therefrom into the annular space, anda sealing ring which is coaxial with both the shaft and the rotatable outer shaft and has a first end face, the first runner forming a first annular sealing interface with the first end face of the sealing ring,wherein the sealing ring has a main body portion formed of a first material having a first stiffness,a retaining ring fixedly fitted to a radially outward side of the main body portion of the sealing ring and formed of a second material having a second stiffness, the second stiffness being greater than the first stiffness such that the retaining ring reduces or prevents radial growth of the sealing ring relative to the rotatable outer shaft under centrifugal loading, the retaining ring having a first anti-rotation formation projecting from an outer side of the retaining ring, wherein an outer surface of the retaining ring and the first anti-rotation formation opposes an inner surface of the rotatable outer shaft. |
