Webbing retractor

摘要

A webbing retractor that can alleviate the load on a reducing balance spring without increasing cost and weight is obtained. When a ring inertially rotates in a retraction direction together with a ratchet gear, a ring-side pressing portion of a load receiving portion accommodating portion formed in the ring presses a spring-side load receiving portion of a clutch spring in the retraction direction. Due to this, the clutch spring is loosened, whereby the ring can easily inertially rotate in the retraction direction together with the ratchet gear, and the load acting on a reducing balance spring can be alleviated.

主权项

1. A webbing retractor comprising:
a spool that retracts a webbing; a retracting spring that urges the spool in a retraction direction in which the spool retracts the webbing; a first rotating body that interlockingly rotates with the spool; a clutch member that is provided at the first rotating body in a state in which the clutch member is elastically in pressure contact with the first rotating body, and that rotates together with the first rotating body; a second rotating body that receives a pressing force from the clutch member and rotates; a reducing balance spring that has one end engaged with the second rotating body, urging force of the reducing balance spring increasing by the one end rotating in an orientation corresponding to rotation of the spool in the retraction direction with respect to another end of the reducing balance spring; a third rotating body with which the other end of the reducing balance spring is engaged; and a regulating member that regulates rotation of the third rotating body by a tongue provided on the webbing being attached to a buckle, wherein the webbing retractor is set such that pressure contact of the clutch member with respect to the first rotating body is loosened due to a reaction force of pressing force, which the clutch member receives from the second rotating body, when the clutch member rotates together with the first rotating body, and the pressure contact of the clutch member with respect to the first rotating body is loosened by the third rotating body, rotating due to the urging force of the reducing balance spring, pressing the clutch member via the reducing balance spring, and wherein the clutch member is configured to include: a spring body that is wound onto an outer peripheral portion of the first rotating body, the spring body including:
a spring-side pressing portion that extends outward in a radial direction from one end of the spring body and that faces a second rotating body-side load receiving portion set in the second rotating body, the spring-side pressing portion pressing the second rotating body-side load receiving portion in a predetermined rotational direction to cause the second rotating body to rotate in the predetermined rotational direction due to the spring body rotating in the predetermined rotational direction, anda spring-side load receiving portion that extends outward in the radial direction from the other end of the spring body and that faces a second rotating body-side pressing portion set in the second rotating body, the spring-side load receiving portion being pressed by the second rotating body-side pressing portion due to the second rotating body rotating in the predetermined rotational direction.