Damped intershaft bearing and stabilizer

In combination, inner and outer coaxially mounted shafts for a twin spool gas turbine power plant, a roller bearing between said shafts including an inner race adjacent said inner shaft, a race supporting ring secured to said inner shaft to rotate therewith supporting said inner race, a viscous damper including pressurized viscous fluid in an annular space between said shaft and said race supporting ring, axial extension portions on said race supporting ring radially spaced from said inner shaft, spring means mounted in said space to add stiffness in parallel with said viscous damper through said bearing means to said outer shaft to increase its critical speed relative to said inner shaft maximum speed whereby said viscous damper is rendered stable.

In combination, inner and outer coaxially mounted shafts for a twin spool gas turbine power plant, a roller bearing between said shafts including an inner race adjacent said inner shaft, a race supporting ring secured to said inner shaft to rotate therewith supporting said inner race, a viscous damper including pressurized viscous fluid in an annular space between said shaft and said race supporting ring, a sleeve secured to said inner shaft to rotate therewith between said race supporting ring and inner shaft, spring means interconnecting said sleeve and said race supporting ring to add stiffness in parallel with said viscous damper through said bearing means to said outer shaft to increase its critical speed relative to said inner shaft whereby said viscous bearing is rendered stable.