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.

The invention refers to a load-bearing structural part (2) of a seat structure of a vehicle seat, which has a cavity (21), in which a belt retractor (40) is arranged.

A pretensioner includes a drive wheel provided with a plurality of engaging teeth for rotating a spool, the spool for winding up a webbing for fastening a passenger; and an elongated resin component that transmits power to the drive wheel during an emergency, wherein the plurality of teeth is positioned such that, when one engaging tooth is caused to contact a tip of the elongated resin component in an approximately planer manner, another engaging tooth adjacent to the one engaging tooth in a direction opposite to a rotation direction can contact a side surface of the elongated resin component.

A belt retractor for a motor vehicle seat belt device, with a rotatably mounted belt reel onto which a seat belt is wound, and a belt tensioner with a drive wheel (1), which drives the belt reel in the event of an activation. A positively controlled tensioner coupling transfers the drive movement from the drive wheel (1) onto the belt reel. At least one coupling pawl (2,3) mounted on the drive wheel (1) and which is moved into and out of engagement with a toothing (20) rotationally fixed in relation to the belt reel to establish and disconnect a rotational connection of the drive wheel (1) with the belt reel. A friction ring (4) has a control arm (11) coupled with the coupling pawl (2,3), wherein in the event of an activation of the belt tensioner, the friction ring (4) performs a relative movement to the drive wheel (1) by frictional forces and, controls via the control arm (11) the movement of the coupling pawl (2,3) into engagement and disengagement with the toothing (20). The friction ring (4) and/or the coupling pawl (2,3) has a blocking contour (12), positioned such that the coupling pawl (2,3) abuts thereon after the disengaging movement out of the toothing (20) and is blocked in the direction of a repeated engagement movement into the toothing (20).

A pretensioner includes a driving wheel and a power transmission unit. A spool is rotatably disposed in the driving wheel. The spool winds a webbing. The power transmission unit transmits power to the driving wheel. The power transmission unit includes a resin-made long body and a passage of the resin-made long body. The resin-made long body rotates the driving wheel. The passage is formed in an outer circumference of the driving wheel. The passage includes a wall surface, a cover member and a stopper. The wall surface is disposed on one side surface of the driving wheel. The cover member is fixed in the wall surface from the other side surface of the driving wheel. The stopper stops a tip portion of the resin-made long body which has rotated the driving wheel. The stopper is configured by a fastening member connecting the cover member and the wall surface.

A webbing take-up device includes a spool, a lock gear that restricts pull-out direction rotation of the spool, a force limiter mechanism that permits pull-out direction rotation of the spool at or above a force limiter load, and a pawl that switches the force limiter load. The webbing take-up device further includes a cylinder section that includes a first cylindrical portion and a second cylindrical portion, a gas generator that supplies gas into the second cylindrical portion, and a piston section that is moved along the first cylindrical portion by an increase in pressure inside the second cylindrical portion and the first cylindrical portion so as to press and displace the pawl. An axial center of the second cylindrical portion is disposed offset with respect to an axial center of the first cylindrical portion, and an abutted portion that is abutted by the piston section is provided at a boundary between the first cylindrical portion and the second cylindrical portion.

A seat belt retractor which is mounted in a mounting space formed on a backrest of a seat installed in a vehicle and comprises a spindle module including webbing and a spindle having the webbing wound on the outer surface thereof, wherein the spindle is arranged along the longitudinal direction of the vehicle corresponding to the thickness direction of the backrest in the mounting space, such that by rotating the direction in which the spindle, on which the webbing is wound, is installed, the width in the longitudinal direction mounted on the backrest of the seat can be minimized, thereby making the retractor more slender.

A seat belt pretensioner for a seat belt device in a vehicle, the pretensioner including a frame, a ball housing attached to the frame and a drive wheel located within the ball housing. A spool is connected to the drive wheel and is fixed to one end of a seat belt webbing so that the webbing may be wound around the spool. The pretensioner further includes a pipe connected to the ball housing and a gas generator connected to the pipe. At least one power transmission element is carried in the pipe and is driven by gas provided from the gas generator to contact the drive wheel and rotate the spool to retract the seat belt. A seal member is located between the at least one power transmission element and the gas generator. The seal member is sized to plug the pipe at an inlet to the ball housing.

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.