公开(公告)号：US20210354656A1

公开(公告)日：2021-11-18

申请号：US16875698

申请日：2020-05-15

Applicant: AUTOLIV ASP, INC.

Inventor： BIN WANG ,  CHRISTOPHER D. HALL ,  JON BURROW ,  KEN KOHLNDORFER

IPC: B60R22/195

Abstract: A seat belt pretensioner for use in a seat belt pretensioning retractor assembly includes a pretensioner tube in fluid communication with a gas generator, and a driving element with a piston disposed inside the pretensioner tube and formed a flexible elongated rod. At least a portion of an outer surface of the elongated rod spaced from an inside surface of the pretensioner tube defines at least one clearance space to be filled by the deformed elongated rod in the event that a gas pressure from the gas generator is applied to the piston when a sprocket is engaged with the elongated rod causing an overpressure condition in an actuation volume defined between the piston and the gas generator within the pretensioner tube.