| 摘要 |
PURPOSE:To eliminate a clearance between the inner diameter of a spacer and the projection of a spindle in heating to correct the concentricity and facilitate the accuracy control by loosely fitting the projection having large rate of expansion at the end face of a rotary shaft into a hole in the rotary center of a rotor and mounting radially expansively a rotor on a flange of the rotary shaft. CONSTITUTION:In a cylindrical hole 11a at the center of a side plate 11 of a drum 1 is cold mounted a cylindrical spacer 13 having coefficient of thermal expansion larger than that of the side plate 11. The inside of the spacer 13 engages a projection 14 of a spindle 4 to fasten the drum 1 to the spindle 4 with bolts 15. The inner diameter of the spacer 13 and the outer diameter of the projection 14 on the spindle 4 are spaced from each other in the normal temperature. Since the material of the spacer 13 has the coefficient of thermal expansion larger than that of the drum side plate 11 and spindle 4, the clearance present in the normal temperature between the spacer 13 and the projection 14 is offset in heating by the difference between the coefficients of thermal expansion of the spacer 13, drum side plate 11 and spindle projection 12 in the rise of temperature to provide concentricity between the spacer and spindle. |
