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.

A seat belt system for protecting an occupant of a vehicle, the system having seat belt webbing connected to a seat belt retractor that includes (a) a frame; (b) a spool with the seat belt webbing wound around, wherein the spool is rotatably mounted to the frame and configured to rotate in a webbing extraction direction and a webbing retraction direction; (c) an energy absorbing device for absorbing energy when the spool is rotated in the webbing extraction direction after an emergency event has occurred; and (d) a mechanism for selectively cancelling the operation of the energy absorbing device by preventing motion of the spool in the webbing extraction direction.

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 32a, 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.

A pyrotechnic tightening device of a safety belt unit having a force-limiting unit, comprising—a gas generator, and—a piston, which is guided in a pipe and which closes a pressure chamber inside the pipe, wherein—a pressure can be applied to the pressure chamber by the gas generator, and—the piston can be driven by the pressure present in the pressure chamber to perform a tightening movement which can be transmitted by means of a force-transmitting unit to the safety belt, wherein—the piston is formed in two parts consisting of a main body and a contact part arranged on the side of the main body facing the force-transmitting unit, wherein—the contact part has a greater strength than the main body, wherein—the main body surrounds the contact part form-fittingly at the end face facing the force-transmitting device.

The present invention relates to a reinforcement cap for reinforcing durability of a pipe used in a seat belt, and more particularly, a reinforcement cap for preventing a pipe from being broken due to explosion of an explosion device stored in the pipe or preventing the explosion device fixed by pipe closing work from being discharged out of the pipe so that an explosive force of the explosion device is transferred to a place other than driving balls stored in the pipe, and a pipe reinforcement cap for a seat belt for preventing a malfunction of the seat belt.

A seatbelt pretensioner system for use in a seatbelt retractor assembly having a spindle and a frame includes a housing adapted for being mounted to the frame and having an interior cavity, a pretensioner tube having a first tube end in fluid communication with a gas generator and a second tube end in fluid communication with the interior cavity of the housing, a pinion being rotatably mounted in the housing and fixedly coupled to the spindle adapted for taking up seatbelt webbing during pretensioning, and a pretensioner rod disposed inside the pretensioner tube. Further, the pretensioner rod has a proximal end disposed towards the gas generator and a distal end disposed away from the gas generator. In addition, the housing is formed with at least two levels including an inboard portion and an outboard portion to store the pretensioner rod after pretensioning.

The invention relates to a belt retractor (10) for a safety belt device, comprising a belt reel (20) for winding and unwinding the safety belt. According to the invention, it is provided that at least one reel end (21) of the belt reel (20) is mounted in a bearing which comprises at least two bearing sections (110, 120, 150) having different play.

A seat-belt retractor having a seat-belt spool and a drive device, both the seat-belt spool and the drive device being modular sub-assemblies and designed as a seat-belt spool module and a drive device module, and said seat-belt spool module and drive device module being interconnectable in different orientations relative to one another via a structural interface.

A webbing take-up device including: a spool; a tube-shaped cylinder; a fluid supply unit; a rotating member including thrust teeth in a radial pattern about a rotation central axial line formed to faces that oppose one another in an axial direction, and including a tapered portion formed to a rotation outer peripheral side end portion of each of the thrust teeth and having a rotation axial direction dimension that decreases on progression toward a rotation radial direction outside, the spool being rotated in the take-up direction by the rotating member rotating toward one side; and a moving member that is moved toward the axial direction leading end side of the cylinder under pressure of the fluid to cause the rotating member to rotate toward the one side by being moved in an engaged state with the thrust teeth of the rotating member.

A webbing take-up device is provided with a spool on which a webbing to be applied to a vehicle occupant is taken up, due to the spool rotating in a take-up direction. The webbing take-up device is also provided with a lock base and a connecting member that are integrally rotatable with the spool. The lock base and connecting member are provided with a lock base-side flange portion and a connecting member-side flange portion, which are disposed opposite to one another in a rotation axis direction of the spool, and with lock base-side second engaging teeth and connecting member-side second engaging teeth.