In a webbing take-up device, in a state in which a stopper of a force limiter stopper mechanism has been brought into abutting contact with a stopper abutment portion resulting in rotation of a spool in a pull-out direction having become limited, the stopper is disposed on the inside of a flywheel hole portion of a flywheel body of a flywheel of a second force limiter mechanism. For this reason, deformation of the stopper outward in its radial direction can be suppressed by the flywheel body of the flywheel.

Provided are a seat belt retractor and a seat belt device with which it is possible to improve an occupant-restraining property and energy absorption characteristics. A seat belt retractor 1 including a spool 2 that winds up a webbing W for restraining an occupant, a shaft 3 inserted through an axial center of the spool 2, and a locking base 4 connected to the shaft 3 and capable of switching between a rotating state and a non-rotating state, further includes an energy absorption device 5 capable of changing an energy absorption amount according to a relative rotation speed between the spool 2 and the shaft 3, and a load adjustment member 6 that blocks or reduces load transmission when a load equal to or greater than a threshold is applied to the shaft 3 or the spool 2. The spool 2, the shaft 3, the locking base 4, the energy absorption device 5, and the load adjustment member 6 are serially connected.

The present invention provides a winder used for a force limiting safety belt, comprising: a winder frame, a reel and a torsion bar. wherein, the winder frame comprises two opposite sidewalls, the corresponding positions of the two sidewalls having circular openings provided, the circular openings having internal toothed segments; the reel comprising a spindle through hole provided along the central axis of the spindle, two detachable end covers provided respectively on the two ends of the spindle, the end covers having external teeth provided along the periphery of the end covers; the torsion bar is divided into two segments in axial direction which are connected to each other by adjoining ends; in a free state, the reel is able to rotate and float provided within the winder frame, two end covers being provided in the circular through opening on the two sidewalls of the winder frame.

A restraint system includes a housing, a spool, a disc, a cutter, a plate, and an actuator. The spool is rotatably coupled to the housing. The disc is fixed to the spool. The cutter is moveable along a path from a spaced position away from the disc to a cutting position adjacent the disc. The plate is moveable between an engaged position extending in the path and a disengaged position spaced from the path. The actuator is coupled to the plate.

A switching mechanism (100) in a force limiter mechanism of a seat belt retractor including: a locking mechanism including a locking element (68) that locks a torque tube (64) with respect to a spindle (61) so that the torque tube (64) rotates together with the spindle (61) and a spindle ring (70); a switch ring (120) rotatable to unlock the locking mechanism; and a switch housing (101) that stores the switch ring (120), a switch piston (115) adapted to activate the switch ring (120). A switching gas generator (116) generates gas for pushing out the switch piston (115) upon activation of the switching mechanism. The switch housing (101) of the switching mechanism (100) has a protrusion (110) that protrudes in an incoming direction of an operated part (122) at an abutment part hit by the switch ring (120) rotated by the switch piston (115) to control movement of the switch ring.

A belt reel (14) for a belt retractor (10) has a rotational axis (R) and a reel body (16) that is provided as a reel for a webbing (24) and has a first axial circumferential circle (34). The reel body (16) further includes a radial constriction (32) having a second axial circumferential circle (36), wherein the constriction (32) is arranged centrally on the reel body (16) in the axial direction (A) and wherein the circumference of the second axial circumferential circle (36) amounts to a maximum of 95% of the circumference of the first axial circumferential circle (34). Moreover, a belt retractor (10) comprising such belt reel (14) is described.

In a vehicle emergency, a spool of a webbing take-up device is rotated in a pull-out direction such that a main lock is displaced toward a rotation-radial direction outside of the spool and engages with a clutch gear configuring a first rotation body. Rotation of the spool in the pull-out direction is thus restricted. Also in a vehicle emergency, the first rotation body is rotated in a take-up direction of the spool such that the main lock engages with the first rotation body, and rotation force of the first rotation body is transmitted to the spool through the main lock and the spool is rotated in the take-up direction.

A belt retractor (40) having a belt reel (14), a seat belt (12) which can be wound thereon to form a belt reel, and at least one first assembly, the first assembly being arranged coaxially with the axis of rotation of the belt reel (14) and in series with the belt reel (14). The belt retractor is especially adapted for mounting inside the frame member of a motor vehicle seat.

An adaptive load-limiting seatbelt assembly for a passenger vehicle includes a rotatable spool drum storing a length of seatbelt fabric and a piezoelectric device including a controller that can dynamically control torque applied to the spool drum resisting pay-out of the seatbelt from the spool drum during a dynamic event such as a vehicle crash.

A seatbelt retractor comprises a housing having a first end and a second end. The seatbelt retractor includes a spool having a first end and a second end each rotatably supported by the housing, the spool being elongated on an axis from the first end to the second end. The seatbelt retractor includes a torsion bar having a first end fixed to the first end of the spool and a second end operatively engaged with the housing. The torsion bar includes a wire elongated along the axis and connected to the first end of the torsion bar and the second end of the torsion bar.