Turbine shaft having inserted disks

Claim 1

In a turbine shaft having a succession of cylindrical bearings arranged in a stepped configuration, connected together by connecting surfaces of revolution and wherein a single disk is shrunk onto each cylindrical bearing and is unconnected to adjacent disks except through said shaft, the improvement wherein: each of said connecting surfaces of revolution comprises two conical surfaces, each of said conical surfaces starting from a respective one of the two successive cylindrical bearings being inclined at an angle of 30° to 60° to the axis of the shaft and tapering towards the axis of the shaft, a cylindrical surface being situated between said pair of conical surfaces and two toroidal surfaces connecting said cylindrical surface respectively to each one of the two conical surfaces, whereby, the zones of the shaft affected by shrinking stresses due to the shrinking of the individual disks to the individual cylindrical bearings is effectively separated from the zones affected by alternate bending stresses which lie intermediate of those zones affected by said shrinking stresses.