Abstract: A torque limiter having an outer ring, an inner ring mounted in the outer ring and a shaft inserted in the inner ring. The outer ring is formed on the inner peripheral surface thereof with a plurality of tapered surfaces. Rollers are mounted between the tapered surfaces and a cylindrical outer peripheral surface of the inner ring. Torque setting springs are provided at one side of the rollers to urge the rollers toward a narrower side between the tapered surfaces and the cylindrical outer peripheral surface. A coil spring is mounted between the inner ring and the shaft so as to bind around the outer peripheral surface of the shaft and having one end thereof secured to the inner ring. The coil spring is mounted so as to be tightened when the shaft rotates in a direction opposite to the direction in which the torque setting springs urge the rollers.

Abstract: A rotary member as a one way clutch including an outer ring formed in its inner periphery with axial grooves each formed on its bottom with a cam surface tapered in one of the opposite directions of rotation, an outer member fixedly mounted on the outer ring and having an end wall for closing one end of the grooves, rolling elements received in the grooves and a closure member adapted to close the other end of the grooves and integrally provided on its inner surface with positioning members and biasing members adapted to be received in the grooves. The positioning members serve to hold the closure member in a fixed position relative to the outer ring. The biasing members serve to bias the rolling elements into narrower side of the cam surfaces. The grooves may have their bottom recessed to receive the positioning members therein. The closure member will thus be positively prevented from turning relative to the outer ring.