| 摘要 |
PURPOSE:To absorb manufacturing and assembling error of a protective cover and control a load securely, by a method wherein expandable length of a bellows cylinder of the protective cover is set greater than stroke length of a movable core. CONSTITUTION:Expandable length L of a bellows cylinder 26 of a protective cover 24 is set greater than stroke length S of a movable core 21. Even if reset stroke length of the movable core 21 is less than prescribed design value, fault is eliminated in such state that decrease of engaging amount of a brake lever with a brake band obstructs the brake action or that drain valve is not closed well. Since the stroke length S of the movable core 21 does not become beyond the expandable length L of the bellows cylinder 26, force of the movable core 21 does not excessively act on the bellows cylinder 26 thereby deterioration of the protective cover 24 is significantly prevented. Furthermore, the protective cover 24 and a cover 28 surround the electromagnet 19 and the movable core 21 as a whole, thereby the device is excellent in sound and moisture-proof effect. |
