US 7,533,842 B2
Webbing retractor
Takuhiro Saito, Niwa-gun (Japan); Katsuki Asagiri, Niwa-gun (Japan); Shinji Mori, Niwa-gun (Japan); and Tomonori Kimura, Niwa-gun (Japan)
Assigned to Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho, Aichi (Japan)
Appl. No. 10/594,749
PCT Filed Mar. 31, 2005, PCT No. PCT/JP2005/006247
§ 371(c)(1), (2), (4) Date Jun. 01, 2007,
PCT Pub. No. WO2005/095164, PCT Pub. Date Oct. 13, 2005.
Claims priority of application No. 2004-109313 (JP), filed on Apr. 01, 2004.
Prior Publication US 2007/0284870 A1, Dec. 13, 2007
Int. Cl. B60R 22/48 (2006.01); B60R 22/46 (2006.01)
U.S. Cl. 242—390.9  [242/382; 242/390.8; 242/381.1; 242/374; 464/41; 192/56.1; 280/806] 26 Claims
OG exemplary drawing
 
1. A webbing retractor comprising: a take-up shaft on which webbing for restraining a vehicle occupant is wound so as to be able to be taken-up thereon and pulled-out therefrom, a motor, and a clutch which is mechanically interposed between the motor and the take-up shaft, and transfers rotation of the motor to the take-up shaft and rotates the take-up shaft, and cuts-off transfer of rotation generated at the take-up shaft side and prevents the rotation from being transferred to the motor, wherein the clutch comprises:
a gear wheel provided coaxially to the take-up shaft, and rotating due to rotation of the motor being transferred thereto;
a rotor provided coaxially to the gear wheel;
a lock bar provided at the rotor and held at a position of released engagement with the take-up shaft, and when the rotor rotates in a first direction around an axis, the lock bar engages the take-up shaft and transfers rotation of the rotor to the take-up shaft, and when the rotor rotates in a second direction around the axis, the lock bar is moved to and held at the position of released engagement;
a ring disposed at an axial direction one side of the rotor, and holding the gear wheel and the lock bar at predetermined assembly positions; and
a spring claw provided between the gear wheel and the rotor along a peripheral direction by being formed integrally with the ring, and, by elastic force of the spring claw, holding the ring at the rotor and transferring rotation of the gear wheel to the rotor, and when load of greater than or equal to a predetermined value is applied to the rotor, the spring claw cuts-off transfer of the rotation by the load, and makes the gear wheel and the rotor able to run idly relatively, and
the gear wheel includes a peripheral direction load receiving portion which receives, along a peripheral direction, load applied from the spring claw.