Abstract: 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.

Abstract: In this webbing take-up device, teeth are formed on flange portions of a rotational member that are disposed opposing each other. The teeth are provided on mutually opposing sides of the flange portions. Discharge portions are formed in the teeth on a rotational center side of the rotational member, and tooth spaces that are adjacent via the teeth are communicated with each other by the discharge portions. Because of the discharge portions, shavings can be discharged, and the shavings can be inhibited from collecting in the tooth spaces.

Abstract: In this webbing take-up device, a first straight portion is set between a first bend portion and a mounting portion of a cylinder, and an axial direction base end portion of a moving member disposed inside the cylinder is disposed inside the first straight portion. Because of this, when the axial direction base end portion of the moving member extends and contracts in the axial direction, it does not receive strong resistance from the cylinder. Because of this, the axial direction base end portion of the moving member can extend and contract in the axial direction, and extension and contraction in the axial direction on the axial direction distal end side of the moving member can be inhibited.

Abstract: A webbing take-up device includes: a spool that enables pull-out and take-up of a webbing; a rotor disposed opposite from the spool, rotation of the rotor being impeded at a time of emergency; a wire of which a proximal end portion is retained at the rotor, at least a distal end portion of the wire being retained at the spool, the wire being disposed between the rotor and the spool, wherein the webbing is pulled out at a time of emergency of a vehicle, the wire being deformed and being wound onto a winding portion of the spool; and a retreat portion provided at the winding portion, the distal end portion of the wire being disposed at the retreat portion in a case in which the wire is wound onto the winding portion.

Abstract: A webbing take-up device including: a spool; a rotating member configured such that the spool is rotated in a take-up direction by the rotating member being rotated toward one side; a cylinder open at an axial direction leading end side; a fluid supplier provided at an axial direction base end side of the cylinder and supplying a fluid inside the cylinder in a vehicle emergency; a moving member provided inside the cylinder, moved toward the axial direction leading end side of the cylinder due to pressure of the fluid, and rotating the rotating member toward the one side by being moved in a state in which a tooth of the rotating member has bitten into or pierced the moving member; and a stopper provided further toward a movement direction side of the moving member than a section where the tooth of the rotating member has bitten into or pierced the moving member, the stopper being pressed by a portion of the moving member where the biting into or piercing of the rotating member has been disengaged, the stopper

Abstract: A webbing take-up device is provided that includes a spool configured to take up a webbing of a seatbelt device, a rotating member configured to rotate the spool in the take-up direction, a tube-shaped cylinder, a moving member provided inside the cylinder that, when moved by a pressurized fluid, causes the rotating member to rotate by engaging with a side of the rotating member. At the end of its movement through the cylinder, the moving member abuts and moves a stopper inside a recess, suppressing movement of the moving member without an engaging member jabbing or biting into the moving member.

Abstract: 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.

Abstract: Provided are a pretensioner, a retractor, and a seat belt device that can achieve weight reduction of a device by improving slidability of a power transmission member used for the pretensioner. A pretensioner includes a drive wheel for rotating the spool, and a power transmission unit for transmitting power to the drive wheel in an emergency. The power transmission unit includes a power transmission member for rotating the drive wheel, a pipe that contains the power transmission member, a gas generator for supplying a working gas into the pipe, and a housing that defines a passage for the power transmission member on an outer periphery of the drive wheel. The housing has a sliding member that is disposed at an outlet part of the pipe and that reduces frictional force between the housing and the power transmission member.

Abstract: Provided are a pretensioner, a retractor, and a seat belt device that can achieve weight reduction of a device by improving slidability of a power transmission member used for the pretensioner. A pretensioner includes a drive wheel for rotating the spool, and a power transmission unit for transmitting power to the drive wheel in an emergency. The power transmission unit includes a power transmission member for rotating the drive wheel, a pipe that contains the power transmission member, a gas generator for supplying a working gas into the pipe, and a housing that defines a passage for the power transmission member on an outer periphery of the drive wheel. The housing has a sliding member that is disposed at an outlet part of the pipe and that reduces frictional force between the housing and the power transmission member.