In a webbing take-up device, when a rotating member is rotated in a take-up direction in a state in which first engagement teeth and second engagement teeth of a rotating member are digging or biting into a moving member, the moving member is pressed by the first engagement teeth and the second engagement teeth of the rotating member. The moving member thus expands into a first deformation-permitting portion and a second deformation-permitting portion in a cover plate, and expanded portions of the moving member oppose a first restriction portion configured by an axial center direction leading end face of a cylinder, and a second restriction portion of the cover plate.

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.

A force limiter control system includes: a variable force limiter unit configured to change a force limiter load; a relative speed detection unit that detects a relative speed between a host vehicle and a preceding vehicle; a force limiter load changing unit that sets a lower load as the force limiter load in a case in which the relative speed is lower than a predetermined threshold value, than in a case in which the relative speed is equal to or greater than the predetermined threshold value; and a low load invalidation unit that invalidates a change to the force limiter load by the force limiter load changing unit in a case in which a collision with a collision object other than the preceding vehicle has been predicted in an undetectable region in which an inter-vehicular distance L to the preceding vehicle is smaller than a predetermined distance.

A seat belt retractor includes a core having an outer surface, a cover having an inner surface facing the outer surface. and a plurality of tubes between the cover and the core. The plurality of tubes is deformable relative to at least one of the core and the cover. Each tube has an outer periphery. The entire periphery of each tube is movable relative to the outer surface and the inner surface.

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.

In a webbing retractor, due to a moving member being moved toward an axial direction distal end side, and first teeth and second teeth of a rotating member piercing the moving member, the rotating member is rotated in a take-up direction. Here, at the moving member, a sectional surface area, in a direction orthogonal to an axis, of a small diameter portion that is at an axial direction distal end side is made to be small as compared with a moving member main body that is at an axial direction proximal end side. Therefore, resistance to movement of the moving member can be reduced.

A three-point seatbelt device includes: a webbing configured to function as a shoulder belt and a lap belt; a shoulder-side reeler that includes a pre-tensioner mechanism and a shoulder-side force limiter mechanism, and is configured to reel up an end portion of the webbing on a shoulder belt side so as to allow the webbing to be pulled out; a tongue mounted on the webbing; and an inner belt including a buckle to which the tongue is coupled, the inner belt including, of a pre-tensioner mechanism and a buckle-side force limiter mechanism, only the buckle-side force limiter mechanism. An initial load of the buckle-side force limiter mechanism is set to be larger than an initial load of the shoulder-side force limiter mechanism.

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 (40) having a belt spool (14), a seat belt (12) that can be wound thereon to a belt spool, and at least a first and a second assembly (1, 2), wherein the first and the second assembly (1, 2) are arranged coaxially to each other and at a first angle (A) to the rotational axis (B) of the belt spool (14) and are connected together by a flex coupling or an angular gear.