| 摘要 |
<p>In a one-way clutch spring 6 which is placed in an annular space 4 between an outer ring 1 and an inner ring 2, and in which engagement members 5 are placed respectively in pockets disposed circumferentially at regular intervals, tongues 6c that elongate respectively into the pockets, and that urge the engagement members toward an engagement side have bends (6d, 6a, 6f) in a basal end portion, placed in the annular space, and are disposed so that an inclination angle alpha to a base 6a in a state where it is previously bent toward a side that will be inside is 20 DEG to 30 DEG . The tongues have a spring constant in a range where an inclination angle to the base when the engagement member 5 placed in the annular space is urged is further increased in a range of 5 DEG to 15 DEG with respect to the inclination angle. The height h2 of a tip end portion of the tongue 6 to the base is larger than the height h1 of an apex of the second bend to the base, and all the radii of curvature of the three bends are in a range of 0.2 to 0.6 mm. According to the configuration, 30% to 60% reduction of a drag torque in a usual use range can be realized with respect to a drag torque of an ordinarily designed product. There is no problem in engagement and cancellation of sprags and the like, and durability can be improved. Furthermore, it is not required to change conventionally used components other than a spring, and only a change of molds for processing the tongues is requested. Therefore, an excessive cost increase does not occur. <IMAGE></p> |
