Joyson Safety Systems Japan G.k.

Kiyoshi Watanabe

Yasushi Kanamori

A power transmission member including a base resin that has a water absorption characteristic that a water absorption rate is 1% or less when Method 1 of ISO 62 (a method for measuring a weight increasing rate after being immersed in water at 23° C. for 24 hours) is used and an elastomer that imparts mechanical characteristics to the power transmission member, in which as the mechanical characteristics, tensile yield stress (ISO 527) is 40 to 54 MPa, tensile fracture strain (ISO 527) is 50% or more, tensile elastic modulus (ISO 527) is 1200 to 1900 MPa, bending elastic modulus (ISO 178) is 1100 to 1700 MPa, and unnotched Charpy impact strength (ISO 179) is no fracture at −30° C. or higher.

Power transmission member, pretensioner, retractor, and method for manufacturing power transmission member

Provided are a seat belt retractor and a seat belt device capable of suppressing an increase in frictional resistance when a pretensioner is steadily driven and increasing the resistance to be applied to a webbing when energy is absorbed. A seat belt retractor includes a guide member facing at least a part of an outer circumferential surface of a locking base and disposed along an opening portion. The guide member is configured not to come into contact with the locking base until a pretensioner is shifted to a steady driving state, is configured to come into contact with the locking base when the pretensioner is steadily driven, and is configured to allow contact between lock teeth and the locking base when subjected to a predetermined load after the pretensioner is shifted to the steady driving state.

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Shiga, Japan

Kiyoshi Watanabe