Webbing take-up device

摘要

In a webbing take-up device, a structure for interlocking a second lock pawl with a first lock pawl is only a shaft. It also suffices for switching between restricting of rotation of a lock ring and cancelling of the restricting to be carried out merely by moving a piston by gas pressure generated at a gas generator. In this way, by a simple structure, it is possible to switch between a mode, in which torsional deformation is brought about at a sub torsion main body of a sub torsion shaft, and a mode, in which torsional deformation is not brought about at the sub torsion main body of the sub torsion shaft.

主权项

1. A webbing take-up device comprising:
a spool that is provided at an inner side of a frame and that takes up a webbing; a first lock base configuring a first lock mechanism that is provided, so as to be able to rotate relative to the spool, at one end side of the spool in an axial direction of the spool; a first energy absorbing member that includes a first body at which torsional deformation arises when a rotational force, which is applied to the spool, exceeds a predetermined first value, and that is connected at an inner side of the spool, in a state in which relative rotation of the first energy absorbing member with respect to the spool is restricted, and that is connected at the one end side of the spool in the axial direction, in a state in which relative rotation of the first energy absorbing member with respect to the first lock base is restricted; a first lock pawl configuring the first lock mechanism, at whose distal end ratchet teeth are formed and that is provided at the first lock base so as to be able to rotate around a base end side of the first lock pawl, and, by rotating, the first lock pawl meshes with ratchet teeth formed at the frame and restricts rotation of the first lock base in a pull-out direction; a second lock base configuring a second lock mechanism, that is provided at another end side of the spool in the axial direction so as to be able to rotate relative to the spool; a second energy absorbing member that includes a second body at which torsional deformation arises when the rotational force, which is applied to the spool, exceeds a predetermined second value, and that is connected at the inner side of the spool in a state in which relative rotation of the second energy absorbing member with respect to the spool is restricted, and that is connected at the another end side of the spool in the axial direction in a state in which relative rotation of the second energy absorbing member with respect to the second lock base is restricted; a lock ring configuring the second lock mechanism that is provided rotatably at an outer side of the second lock base, and at whose inner peripheral portion ratchet teeth are formed; a second lock pawl configuring the second lock mechanism at whose distal end ratchet teeth are formed and that is provided at the second lock base so as to be able to rotate around a base end side of the second lock pawl, the second lock pawl being configured to be able to mesh with the ratchet teeth of the lock ring by the second lock pawl rotating in a same direction as a rotation direction of the first lock pawl at a time when the first lock pawl meshes with the ratchet teeth of the frame, and the second lock pawl causing the lock ring to rotate in the pull-out direction integrally with the second lock base by the second lock pawl meshing with the ratchet teeth of the lock ring; a switching unit that has a restricting member restricting rotation of the lock ring in a state of being engaged with the lock ring, and that, by actuating, switches a state of engagement of the restricting member with respect to the lock ring; and a connecting member that is provided so as to pass through the spool in a direction along a central axis of the spool, and that connects the first lock pawl and the second lock pawl integrally, due to the spool rotating relative to the first lock base in the pull-out direction, a first lock pawl side of the connecting member breaking, and, due to the spool rotating relative to the second lock base in the pull-out direction, a second lock pawl side of the connecting member breaking.