| 摘要 |
<p>PURPOSE:To keep braking force constant by providing a multi-stage spring and mounting the spring in the direction of decreasing in spring force with an increase in length of a void. CONSTITUTION:When a d.c. current is applied to a coil 5, magnetic flux flows through an iron core 4 to cause magnetic attractive force between the iron core 4 and a movable iron core 10, so that a void between the iron core 4 and the movable iron core 10 can be reduced. By this action, the movable iron core 10 and a movable shaft 6 receive the force, so that a lining holder 2 pushes up a brake she 1. In this arrangement, the natural lengths and spring constants of a return spring 3 and a load adjust spring 8 are combined to provide spring characteristics shown by cruves 15, 16, 17, thereby to cancel a magnetic attractive force change for a void length change and obtain fixed push-up force within a fluctuation range of push-up force in the use range 18.</p> |
