| 摘要 |
PURPOSE:To increase a vibration damping effect on vibration of a relatively low cycle, by a method wherein motion energy of vibration is consumed by a hysteresis loss incurring due to relative rotation between a hysteresis material and permanent magnets, positioned facing the hysteresis material. CONSTITUTION:A hysteresis material 6, having a high hysteresis loss, is secured to a screw shaft 4 being a rotary body, and plural permanent magnets 7 are secured to its outer periphery at intervals. Further, the magnetic poles on the hysteresis material 6 side of the plural permanent magnets 7 are aligned in a manner to be alternately different. A hysteresis loss incurs due to relative rotation between the hysteresis material 6 and the permanent magnets 7, and consumes motion energy of vibration. This is not influenced by a vibration velocity, resulting in production of a sufficient vibration damping effect even on vibration of a relatively low cycle. |
