| 摘要 |
PROBLEM TO BE SOLVED: To automatically return a magnet support cylinder to a non braking position by a return spring even if the fluid pressure system of an actuator fails when driving at a high-speed. SOLUTION: A guide cylinder 10 consists of a non-magnetic substance and is rovided close to a rotator 7. A number of magnets 24 are connected with the magnet support cylinder 14 supported on an inner hollow part of the guide cylinder 10 so that the polarities facing the rotator 7 alternately changes in the circumference direction of the rotator 7. A ferromagnetic member 15 is placed on a part facing each of magnets 24 of the guide cylinder 10. The actuator rotates the magnet support cylinder 14 to the non-braking position where the two magnets 24 arranged in the circumference direction partially face the common ferromagnetic member 15 or to the braking position where each of the magnets 24 completely faces each ferromagnetic member 15. This actuator is composed of a main actuator A and a sub actuator B that can be retained at the intermediate position between the non-braking position and bull braking position and a return spring 6 in a fluid chamber.
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