Webbing take-up device

摘要

A webbing take-up device is obtained capable of restricting movement of a clutch member in the axial direction of a second gear. In the webbing take-up device, a movement prevention portion is formed, on a rotor side, at an intermediate bottom portion of a large gear portion, and a clutch spring attached to the rotor abuts the movement prevention portion, thereby preventing any movement of the clutch spring further to the intermediate bottom portion side. Movement of the clutch spring in the axial direction of the rotor can accordingly be suppressed, enabling movement of the clutch spring in the axial direction of the rotor to be restricted.

主权项

1. A webbing take-up device comprising:
a spool on which webbing is taken up; a motor that rotates the spool; a first gear that is provided on a rotation transmission route from the motor to the spool; a second gear that is provided on the rotation transmission route and that is capable of relative rotation with respect to the first gear; a clutch member that is provided at the first gear and transmits rotation between the second gear and the first gear, and that cuts off the rotation transmission by the clutch member rotating relative to the second gear; a restriction section that is provided between the first gear and the clutch member in an axial direction of the second gear, and that restricts movement of the clutch member toward the first gear side, and a rotor including: a circular cylinder portion that is formed in a circular cylinder shape; and a corner portion that is formed at an end portion of the circular cylinder portion at a side of the first gear, the corner portion having a tapered shape such that, as seen along the axial direction of the second gear, a diameter of the corner portion is reduced compared to a diameter of the circular cylinder portion, wherein, due to the restriction section, the clutch member is wound onto the rotor at a position further toward a side of the circular cylinder portion in the axial direction than a position of the corner portion, which position is an outer most position in a radial direction of the circular portion, and the rotor is fixed to the second gear, and wherein the restriction section is integrally formed at the first gear.