Webbing take-up device

Abstract

In a webbing take-up device, a base cartridge receives the pressure of gas generated by a micro gas generator (“MGG”), load from a piston that is moved by the pressure of the gas, and a reaction force acting on the MGG when gas has been ejected from the MGG. This enables the strength retention structure of the base cartridge with respect to the above-described pressure, load, and reaction force to be simplified.

What is claimed is: 
     
         1 . A webbing take-up device comprising:
 a spool that rotates in a pull-out direction due to a webbing being pulled out;   a force limiter member that is capable of actuating with rotation of the spool in the pull-out direction, and that, in an actuated state, absorbs a part of a rotation force of the spool by being deformed;   a deformation amount changing member that is provided so as to be able to deform the force limiter member, that changes a deformation amount of the force limiter member by being displaced in a deformation amount changing direction, and that is capable of being displaced in the deformation amount changing direction by a load from the force limiter member in the actuated state; and   a prevention release section that prevents displacement of the deformation amount changing member in the deformation amount changing direction, and that releases prevention of displacement of the deformation amount changing member by being actuated.   
     
     
         2 . The webbing take-up device of  claim 1 , wherein a direction of the load from the force limiter member in the actuated state toward the deformation amount changing member is toward a deformation amount changing direction side. 
     
     
         3 . The webbing take-up device of  claim 2 , wherein:
 displacement of the deformation amount changing member in the deformation amount changing direction is caused by the deformation amount changing member being rotated; and   a center position of rotation of the deformation amount changing member is set such that a direction of the rotation of the deformation amount changing member is toward a side of the direction of the load from the force limiter member in the actuated state toward the deformation amount changing member.   
     
     
         4 . The webbing take-up device of  claim 3 , further comprising:
 a prevention member that configures the prevention release section, that is abutted by the deformation amount changing member so as to prevent displacement of the deformation amount changing member in the deformation amount changing direction, and that releases prevention of displacement of the deformation amount changing member in the deformation amount changing direction by being rotated, wherein a load from the deformation amount changing member toward a side of a center of rotation of the prevention member is input to the prevention member due to a load that displaces the deformation amount changing member in the deformation amount changing direction being imparted to the deformation amount changing member; and   a prevention member support section that supports the prevention member so as to allow rotating of the prevention member, from an opposite side of the center of rotation of the prevention member from an abutting portion of the prevention member, at which the prevention member abuts the deformation amount changing member.   
     
     
         5 . The webbing take-up device of  claim 1 , further comprising a moving member that is moved when a drive device is actuated, wherein
 the deformation amount changing member is configured to rotate, and   the prevention release section is configured to rotate,   the prevention release section includes a load receiving portion,   the prevention release section is rotated by the load receiving portion being pressed by the moving member when the moving member is moved such that the prevention release section releases prevention of displacement of the deformation amount changing member.   
     
     
         6 . The webbing take-up device of  claim 5 , wherein
 a stopper portion is formed at the prevention release section, the stopper portion extending toward outside of a base section of the prevention release section,   the deformation amount changing member includes an abutting portion,   in an initial state of the deformation amount changing member and the prevention release section, the stopper portion abuts an end portion of the abutting portion such that the prevention release section prevents displacement of the deformation amount changing member in the deformation amount changing direction,   in the initial state of the deformation amount changing member and the prevention release section, an extension direction of the stopper portion from the base section is a tangential direction of rotating of the deformation amount changing member at the end portion of the abutting portion.   
     
     
         7 . The webbing take-up device of  claim 6 , wherein a rotation center is provided at the base section of the prevention release section, the prevention release section capable of rotating about the rotation center.