Patent ID: 7744030
Filing Date: 2010-06-29
Classification: B60R

Abstract:
1. A webbing retractor comprising: a spool on which a webbing for restraining a vehicle occupant is taken-up, the spool being able to rotate in a take-up direction and in a pull-out direction that is opposite to the take-up direction, and a spool braking mechanism that, when an angular velocity of the spool rotating in the take-up direction reaches a predetermined upper limit angular velocity, applies resistance to rotation of the spool and decelerates a rotational speed of the spool in the take-up direction, the spool braking mechanism including a braking shaft disposed coaxially with the spool, and a decelerating member applying rotation resistance to an outer peripheral surface of the braking shaft, wherein the spool braking mechanism further comprises: a rotating body disposed coaxially and connected with the spool; a braking gear disposed coaxially with the spool, and able to rotate relative to the spool; a braking pawl disposed at the rotating body, and causing the braking gear to rotate integrally with the rotating body in the take-up direction; and a pawl driving mechanism that, when the spool is rotating in the take-up direction at less than the predetermined upper limit angular velocity, holds the braking pawl at a separated position at which the braking pawl is separated from the braking gear, and that, when the spool rotates in the take-up direction at greater than or equal to the predetermined angular velocity, operates the braking pawl to an engaging position at which the braking pawl engages with the braking gear, and the decelerating member comprises an elastic member that applies rotation resistance to the outer peripheral surface of the braking shaft when the braking gear rotates integrally with the rotating body.