| 摘要 |
There is provided a turbine rotor comprising a hub part (9) connected to a rotor shaft (19); and a plurality of blade parts (11) formed around an outer periphery of the hub part (9), the hub part (9) and the blade parts (11) being integrated into one piece. A diameter of the hub part (9) gradually increases toward a rear side surface (42, 54) on an end side of the hub part (9) along the direction of the rotation shaft (19). An annular recess (44, 50) is formed on the rear side surface (42, 54) around the rotation shaft (19). A cross-section of the annular recess (44, 50) in the direction of the rotation shaft (19) is formed from a part of either an arc (F) of a circle or a major arc (E) of an oval shape (G'), which major arc (E) is formed so that the oval shape (G') is divided by a major axis as a symmetrical axis of the oval shape (G'), said major axis being parallel to the rear side surface (42, 54). The major axis or a center (P) of the arc (F) of the circle is located outside of the hub part (9) at a distance (S) from the rear side surface (42, 54). |
