| 摘要 |
PURPOSE:To reduce the local stress of a disc, by forming a radial key protrusion in a side surface of a hub part of the disc, mounted to a rotor and having moving blades in the periphery, and fitting this protrusion to a radial key groove formed in a side surface of a torque ring. CONSTITUTION:A turbine rotor arranges both a disc 3, fitting a rotor 1 and having moving blades 2 in the periphery, and a torque ring 13 neighboring to the disc 3 further fitting the rotor 1. And the torque ring 13 is connected with the rotor 1 by a bore key 16. Here the disc 3 forms in its hub part 11 a radial key protrusion 18 protruding sideward. While the torque ring 13 forms in its side surface a radial key groove 19 fitting the protrusion 18. In this way, the disc 3, even when its shrinkage fit surface generates looseness, enables torque to be surely transmitted from the moving blade 2 to the rotor 1. While the disc 3, forming no key groove, can eliminate concentration of stress generated in the key groove. |
