Retractor device for seatbelt, and seatbelt device

摘要

A torsion bar capable of torsional deformation, a ring arranged at a shaft end portion of a spool and connected rotatably integrally with an outer peripheral portion on the other side in an axial direction of the torsion bar, a plastic-deformable plate member having one end side fixed to an outer peripheral portion of the ring and the other end side being a free end in the vicinity of an inner peripheral portion of the shaft end portion of the spool, and a projecting portion which projects from an inner peripheral surface of the spool, which is brought into contact with the other end of the plate member after the torsion bar starts rotating integrally with the spool and an impact absorbing load of the torsion bar becomes constant due to torsional deformation, and which imparts a load for plastically deforming the plate member in further rotation of the spool.

主权项

1. A retractor device for a seatbelt, comprising:
a substantially cylindrical member rotatable for winding the seatbelt; a shaft member capable of torsional deformation arranged coaxially on an inside of said substantially cylindrical member and connected rotatably integrally with said substantially cylindrical member; a plate mounting member arranged on a shaft end portion of said substantially cylindrical member and connected rotatably integrally with an outer peripheral portion of said shaft member on the other side in an axial direction; a lock mechanism which can prevent rotation of said plate mounting member in a seatbelt extracting direction; a plastic-deformable first plate member having one end side fixed to an outer peripheral portion of said plate mounting member and the other end side being a free end in the vicinity of an inner peripheral portion of said shaft end portion of said substantially cylindrical member; and a first projecting portion which is provided projecting from the inner peripheral surface of said substantially cylindrical member, which is brought into contact with said the other end side of said first plate member after said shaft member starts rotating integrally with said substantially cylindrical member and an impact absorbing load of said shaft member becomes constant due to said torsional deformation, and which imparts a load for plastically deforming said first plate member in further rotation of said substantially cylindrical member.