Webbing take-up device

摘要

In a pretensioner mechanism of a webbing take-up device, a sealing member seals a communicating hole of a piston. When a force limiter mechanism is operated and rotating of a spool in a pull-out direction is allowed, the piston is moved to an upper side in a state in which the sealing member is pressed and contacted against a cylinder. As a result, the sealing member is turned and the sealing of the communicating hole by the sealing member is released. In consequence, a number of components may be reduced and assembly characteristics of the pretensioner mechanism may be improved.

主权项

1. A webbing take-up device comprising:
a webbing that can be applied to an occupant of a vehicle; a take-up member onto which the webbing is taken up, by the take-up member being rotated in a take-up direction, the take-up member being rotated in a pull-out direction by the webbing being pulled out; a moving member in which a communicating hole is provided, the communicating hole communicating between one side and another side of the moving member, and the take-up member being rotated in the take-up direction by the moving member moving toward the one side; a restricting member that is provided at the communicating hole and restricts communication through the communicating hole; an accommodating member in which the moving member is accommodated, the moving member being moved to the one side by gas being supplied to the accommodating member at another side of the moving member; and a force limiter mechanism that allows rotating of the take-up member in the pull-out direction when a load from the occupant that is at least a predetermined load or more acts on the take-up member via the webbing, wherein, when the force limiter mechanism allows rotating of the take-up member in the pull-out direction, the moving member moves to the another side due to rotating of the take-up member in the pull-out direction in a state in which the restricting member is in contact with the accommodating member, and the restricting member allows communication through the communicating hole, and wherein, by the moving member being moved to the another side in the state in which the restricting member is in contact with the accommodating member, the restricting member is caused to be turned and allows communication through the communicating hole.