| 摘要 |
An electromagnetic powder clutch of double-gap type comprising a first rotary member, a second rotary member and a labyrinth device. The first rotary member has a first friction surface, and a second friction surface which is disposed radially inwardly of and opposite to the first friction surface. The second rotary member of an annular shape incorporates therein an annular solenoid coil and has a wall thickness sufficient to accommodate the solenoid coil. The second rotary member is disposed between the first and second friction surfaces of the first rotary member, and has a radially outer friction surface opposite to the first friction surface and a radially inner friction surface opposite to the second friction surface. The outer friction surface of the second rotary member cooperates with the first friction surface to define therebetween a first powder gap accommodating a first mass of magnetic powder, while the inner friction surface cooperates with the second friction surface to define therebetween a second powder gap accommodating therein a second mass of magnetic powder. The labyrinth device closes the first and second powder gaps to enclose the first and second masses of magnetic powder in the first and second powder gaps, respectively.
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