Pretensioner device

摘要

The pretensioner device of the present invention comprises: a cylindrical portion provided coaxially and integrally with one side in the axial direction of a take-up shaft at which a webbing for restraining a vehicle occupant is taken-up and pulled-out, the cylindrical portion being open toward an outer side; a piston provided at one side in the axial direction of the cylindrical portion, and moving due to operation of a gas generating means at a predetermined time; a rotating body which is disposed relatively rotatably at an inner side of the cylindrical portion and at whose outer peripheral portion a plurality of engaging teeth are formed, the rotating body being rotated in a webbing take-up direction due to the piston moving; and a clutch plate having a plurality of meshing claws which are connected together integrally and which respectively fit-together with valley portions of the plurality of engaging teeth of the rotating body, and when the rotating body rotates relatively in the webbing take-up direction, the plurality of meshing claws are guided by the plurality of engaging teeth, and deform outwardly, and engage an inner peripheral surface of the cylindrical portion, wherein the engaging teeth of the rotating body have rotation restricting walls which face end surfaces in the webbing take-up direction of the meshing claws of the clutch plate, and due to the end surfaces of the meshing claws engaging with the rotation restricting walls, relative rotation of the clutch plate in the webbing take-up direction with respect to the rotating body is restricted.