| 摘要 |
PURPOSE:To suppress the generation of vibration and noise by making to single body primary bending intrinsic angular frequency of a hollow part above a specific hertz, making the ratio of the wall thickness to the outside diameter of said hollow part less than a specific value, and press fitting a damping body made of elastic material into said hollow part. CONSTITUTION:In a cylindrical hollow rotary driving shaft 3 made of metal which has solid parts 4 on both ends and which is supported by these solid parts 4, the single body primary bending intrinsic angular frequency of its hollow part is above 500Hz while the ratio t/D of the wall thickness (t) to the outside diameter D of the hollow part 5 is 0.06 or less. And, a damping body 6 of an elastic material is press fitted into the hollow part 5, reducing a primary bending resonance. Since the single body primary bending intrinsic angular frequency is made above 500Hz while making the ratio t/D 0.06 or less in this cylindrical hollow rotary driving shaft 3, the press fitting effect of the damping body 6 made of elastic material is large. By such a damping structure, the primary bending resonance can be effectively reduced. |
