EDDY-CURRENT TYPE SPEED REDUCER

PROBLEM TO BE SOLVED: To provide a synchronous rotation system eddy current type speed reducer capable of preventing foreign matter from being attached to a gap between a brake member and a permanent magnet.SOLUTION: A reducer includes: a magnet holding member 4 which is rotatably supported by a rotary shaft 11 of a vehicle and holds a plurality of permanent magnets 5 over a circumferential direction; a brake member 1 which is composed of a pair of disk parts 1a, 1b and a cylindrical part 1c for coupling the outer peripheral parts of these disk parts 1a, 1b to each other and fixed to the rotary shaft 11 so as to surround an area of the permanent magnets 5; and a friction brake which presses brake pads 8a, 8b to a brake drum 6 integrated with the magnetic holding member 4 during braking to make the magnet holding member 4 still. 【課題】制動部材と永久磁石との隙間に異物が付着するのを防止することができる同期回転方式の渦電流式減速装置を提供する。【解決手段】減速装置は、車両の回転軸１１に回転可能に支持され、複数の永久磁石５を円周方向にわたり保持した磁石保持部材４と、永久磁石５の領域を包囲するように一対の円板部１ａ、１ｂ及びこれらの円板部１ａ、１ｂ同士の外周部を連結する円筒部１ｃからなり、回転軸１１に固定された制動部材１と、制動時に磁石保持部材４と一体のブレーキドラム６にブレーキパッド８ａ、８ｂを押し付けて磁石保持部材４を静止させる摩擦ブレーキと、を備える。【選択図】図２