| 摘要 |
PURPOSE:To make stable vibration reducing force producible by connecting a pair of joint parts of a turning shaft provided with a magnet so as to cause both N and S poles to be opposed to each other, while constituting it to set up an electromagnet on each peripheral surface of these joint parts with a radial clearance. CONSTITUTION:A pair of joint parts 1, 2 of a turning shaft are connected to each other so as to cause an N pole and an S pole of permanent magnets 3, 4 to be opposed to each other via a fixture 5 of bolt and nut. On the other hand, at the radial outward of the paired joint parts 1, 2, an electromagnet 6 is fixedly set up there so as to space a specified interval in a gap with each outer surface of these joint parts 1, 2. In this electromagnet 6, its magnetic force is displaced according to the magnitude of a current flowing into an exciting coil 7, thereby varying attraction to be produced between the S pole of the permanent magnet 3 and the N pole of the electromagnet 6 or the N pole of the permanent magnet 4 and the S pole of the electromagnet 6, and the attraction conformed to force F being produced in the axial direction is given thereto. With this constitution, an axial position of the turning shaft is stably kept up all the time. |
