| 摘要 |
PROBLEM TO BE SOLVED: To provide an eddy current-type reduction gear where magnetic short-circuit of a permanent magnet can be suppressed, when the permanent magnet of a magneto ring is made to be comparatively thin. SOLUTION: The eddy current-type reduction gear includes a braking rotor 1, fitted to a rotation axis and the magneto ring 6 arranged so as to face the braking rotor 1. The magneto ring 6 includes a plurality of permanent magnets 8, which are arranged in a circumferential direction by leaving prescribed intervals and in which the magnetic poles are formed on a braking rotor 1-side and a side opposite to the braking rotor 1, and with a magnetic member 9 coupling the magnetic poles directed to a side opposite to the braking rotor 1 among the magnetic poles of the permanent magnets 8. Eddy current is caused in the braking rotor 1, and the rotation axis is slowed down and braked by supplying magnetism from the permanent magnet 8 to the braking rotor 1. A groove 11 is arranged in a face 10, facing the braking rotor 1 of the permanent magnet 6, by making it position in between the permanent magnets 8 in the circumferential direction. COPYRIGHT: (C)2007,JPO&INPIT
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