| 摘要 |
A torque limiter comprises: a bottomed cylinder formed of a magnetic material; an end plate fixedly and coaxially fitted in the open end of the cylinder; a rotary shaft coaxially and rotatably supported in bearings fitted in the bottom wall of the cylinder and the end plate, respectively; two rotors formed of a magnetic material and coaxially secured to the rotary shaft; a permanent magnet disposed between and contiguously to the rotors and coaxially secured to the rotary shaft; and an annular core formed of a magnetic material and coaxially fitted in the cylinder contiguously to the end plate; magnetic powder filled an axially in extending gap between the core and one of the rotors disposed opposite to the core; and sealing members disposed between the bottom wall of the cylinder and one of the rotors on the side of the bottom. surface of the cylinder and between the inner end wall of the end plate and the other rotor on the side of the end plate. In filling the magnetic powder in the gap, the cylinder is placed upright with the open end thereof turned up, then the magnetic powder is distributed over a radially outermost part of an axial end surface of the rotor, and then the annular core and the end plate are fitted in the open end of the cylinder in that order. Since the rotor is magnetized by the permanent magnet, the magnetic powder is attracted to the rotor, and hence will not fall off, which facilitates filling the magnetic powder in the gap.
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