Webbing take-up device

摘要

A webbing take-up device that is both capable of promoting reductions in size and weight and capable of excellently maintaining coupling strength between a pawl member and a ring portion. A clutch plate and a lock ring of this webbing take-up device are coupled by plural teeth provided at the clutch plate meshing with plural teeth provided at the lock ring. This lock ring is specified to have a lower material strength than the clutch plate. A tooth height H2 of the plural teeth of the lock ring is specified to be lower than a tooth height of the plural teeth of the clutch plate. Thus, when the lock ring and the clutch plate mesh, tooth tips of the plural teeth of the clutch plate come into contact with tooth bottoms of the plural teeth of the lock ring.

主权项

1. A webbing take-up device comprising:
a rotary member that rotates integrally with a spool; and a load transmission mechanism that transmits a load between the spool and a frame that rotatably supports the spool, wherein the load transmission mechanism comprises: a ring portion provided at the frame side thereof, a plurality of teeth being provided at an inner periphery portion of the ring portion, which inner periphery portion is concentric with the rotary member; and a pawl member disposed at the inner side of the ring portion, the pawl member being supported at the rotary member to be movable to a meshing position, at which a plurality of teeth provided at a distal end portion of the pawl member mesh with the plurality of teeth provided at the ring portion, and wherein the pawl member teeth have a material strength specified to be higher than the material strength of the ring portion teeth, and a tooth height of the teeth provided at the one is specified to be lower than a tooth height of the teeth provided at the other, and all of the ring portion teeth have a same shape, and all of the pawl member teeth have a same shape.