The Torque Transmission Characteristics of the Spring Clutches

Abstract

The spring clutches are widely used in the teleprinters and the input-output equipments in which the high-speed start-stop performances are required. In order to clarify (or improve) the dynamic characteristic of these equipments, it is necessary to understand the torque transmission characteristics of the spring clutches which have the hysteresis characteristic by the friction-loss. Therefore, this paper discussed about the distribution of gripping force by helical coil spring, distribution of the elongation of the spring wire and torque transmission in forward or backward rotation, in consideration of the friction between the spring wire and drum of the spring clutch. As the result of this analysis the simple expressions for the hysteresis characteristic of the torque transmission are obtained. And, it is made sure that these expressions agree with the measurements of the static characteristics of torque transmission.