Patent ID: 8376258

Claim:
A webbing take-up device comprising: a take-up spool that takes up a webbing for vehicle occupant restraint; a motor; and an overload release mechanism that is interposed between the take-up spool and the motor, wherein the overload release mechanism includes: a first rotating body that is rotated interlockingly with one of the take-up spool or the motor; a second rotating body that is provided coaxially with the first rotating body and relatively rotatably with respect to the first rotating body, and that is rotated interlockingly with the other of the take-up spool or the motor, an inner periphery portion of the second rotating body opposing an outer periphery portion of the first rotating body; and a plurality of helical friction springs that are each formed by a spring member in an annular shape, that are disposed between the outer periphery portion of the first rotating body and the inner periphery portion of the second rotating body and side by side along an axial direction of the first and the second rotating bodies, that suppress relative rotation with respect to one of the first rotating body or the second rotating body by friction generated between the friction springs and the one of the first rotating body or the second rotating body, and that prevents relative rotation with respect to the other of the first rotating body or the second rotating body by engaging with the other of the first rotating body or the second rotating body, wherein the plurality of helical friction springs include a pair of coil springs, helix orientations of which are set to mutually opposite orientations, and the pair of coil springs receiving forces in directions approaching one another due to friction with the one of the first rotating body or the second rotating body during relative rotation in one direction around the axis with respect to the one of the first rotating body or the second rotation body.