Abstract: 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; an annular core formed of a magnetic material and coaxially fitted in the cylinder contiguously to the end plate; magnetic powder filled in the gap between the core and one of the rotors disposed opposite to the core; and sealing members disposed between the bottom surface of the cylinder and one of the rotors on the side of the bottom surface of the cylinder and between the inner end surface of the end plate and the other rotor on the side of the end plate.

Abstract: 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.