A safety belt retractor having a load limiting device is provided. The load limiting device comprises: a hollow spool (1) on which a webbing can be wound, a locking disk (2) having a flange (21) and a sleeve (22) attached thereto, and a torsion bar (3); the locking disk (2) can be mounted with the flange (21) on an end of the spool (1) and can extend with the sleeve (22) into a hollow chamber of the spool (1), and the spool (1) is rotatable in relation to the locking disk (2); the torsion bar (3) can be arranged in the hollow chamber of the spool (1) and is fixed on the spool (1) and on the locking disk (2) in a rotationally secured manner. The load limiting device further comprises a load limiting ring (5) with a thread (51) on the inner circumference, the load limiting ring (5) can be rotated around the sleeve (22) with the rotation of the spool (1), and the sleeve (22) is provided on its outer circumference with an engaging section (221) and with a resistance part for applying a resistance to the load limiting ring (5), the sleeve (22) having in the engaging section (221) a mating thread which matches with the thread (51) of the load limiting ring (5) and the resistance part being arranged downstream of the engaging section (221) in the axial displacement direction of the load limiting ring (5).

A webbing take-up device includes a spool. The webbing take-up device also includes a lock base and a coupling member that are provided so as to rotatable as an integral unit with the spool, and that engage with a rack so as to be rotated and to rotate the spool in a take-up direction when the rack is moved. The webbing take-up device further includes a rack housing section that includes a pair of wall spaced apart from each other in a rotation axis direction of the lock base and the coupling member so as to form a space in which the lock base and the coupling member are disposed. The rack housing section is provided with an abutted portion that is abutted by a part of the coupling member so as to restrict the lock base and the coupling member from moving in the rotation axis direction.

The invention relates to an active restraint system (1), comprising a seat belt retractor (3), having a frame (2) and a belt reel (4) with a belt webbing (10) wound thereon and rotatable supported by the frame (2) for allowing winding and unwinding the belt webbing (10). An electric disc motor (28) comprising a rotor (30) and a stator (32) is attached to the belt reel (4). The rotor (30) is directly attached by an attachment (31) to the belt reel (4). The restraint system further comprises a control unit (40) connected to the disc motor (28) and adapted to control the disc motor (28) to drive the belt reel (4) in accordance with a determined belt motion profile.

A buckle device includes: a buckle body to which a tongue portion mounted on a three-point seat belt is to be connected; a connecting member that is flexible and that has a first longitudinal end portion connected to the buckle body; and a force limiter mechanism including a take-up shaft around which a second longitudinal end portion of the connecting member is wound, the take-up shaft being supported below the buckle body in a vertical direction of a vehicle so as to be rotatable relative to a vehicle seat or a vehicle body, and an energy absorbing member that is deformed by rotation of the take-up shaft.

In a vehicle emergency, rotation of a lock base in a pull-out direction opposite to a take-up direction is restricted. A first pinion-configuring portion formed at an outer circumferential portion of the lock base configures one width direction side of a pinion section that is rotated in the take-up direction by a rack that moves due to fluid pressure in a vehicle emergency. A coupling member disposed between the lock base and the torsion shaft is fixed to the lock base and to a torsion shaft. A second pinion-configuring portion that configures a width direction other side of the pinion section is formed alongside the first pinion-configuring portion at an outer circumferential portion of the coupling member.

A seat belt retractor that includes a torsion bar is positioned in a spool. The second end of the torsion bar is engaged with a locking mechanism mounted to the frame. The torsion bar is configured to be locked at the second end while the first end rotates with the spool so that the torsion bar deforms to absorb force. The locking mechanism includes a lock base and a locking hub that is mounted to the second end of the torsion bar and is releasably connected to the lock base to prevent the second end of the torsion bar from rotating. The locking hub is configured to be released and rotate relative to the lock base to thereby permit rotation of the second end of the torsion bar with the first end of the torsion bar and the spool.

A webbing retractor includes a spool, a motor, a force limiter mechanism, a first rotating body, a second rotating body, a ratchet gear, a pawl body and a control section. The ratchet gear is provided at one of the first rotating body or the second rotating body. The pawl body is provided at another of the first rotating body or the second rotating body. The pawl body can engage with the ratchet gear in a case in which the first rotating body rotates toward one side, and engagement of the pawl body with the ratchet gear being cancelled in a case in which the first rotating body rotates toward another side. The control section drives the motor to rotate in reverse, such that the first rotating body rotates toward another side in a case in which a physical amount relating to load of the passenger exceeds a predetermined value during forward rotational driving.

A seat belt retractor for use with a seat belt webbing includes a spindle, a tread head part, a torsion bar, a stop nut and an energy management element. The spindle is configured for winding the seat belt webbing around the spindle. The tread head part is configured for having a locked condition or a free condition. The torsion bar is engaged with the spindle and the tread head part and configured to deflect torsionally by allowing relative rotation between the spindle and the tread head part when the tread head part is in the locked condition. The stop nut is operatively coupled with the tread head part and the spindle and configured to move in axial direction. Furthermore, the energy management element placed between the stop nut and the tread head part is configured to be deformed by the axial movement of the stop nut.

A belt retractor comprises a frame (10), a belt reel (12) rotatably arranged in the frame (10) and having a first end (16) and an opposite second end (17) as well as comprising a blocking mechanism (18) arranged at an end face of the belt reel (12) by which the belt reel (12) can be blocked within the frame (10). The belt retractor further comprises an axially extending first load limiter which is releasably coupled to the belt reel (12) by means of a disconnecting clutch (24), a second load limiter which is coupled to be rotationally fixed to the first load limiter or a hub, and a third load limiter which can be coupled to be rotationally fixed to the belt reel (12) by means of a connecting clutch (38). Moreover, a method for controlling such belt retractor is provided.

A seat belt retractor for use with a seat belt webbing includes a spindle, a tread head part, a torsion bar, a stop nut and an energy management element. The spindle is configured for winding the seat belt webbing around the spindle. The tread head part is configured for having a locked condition or a free condition. The torsion bar is engaged with the spindle and the tread head part and configured to deflect torsionally by allowing relative rotation between the spindle and the tread head part when the tread head part is in the locked condition. The stop nut is operatively coupled with the tread head part and the spindle and configured to move in axial direction. Furthermore, the energy management element placed between the stop nut and the tread head part is configured to be deformed by the axial movement of the stop nut.