Pretensioner having fracture connection-type rack gear

Abstract

A pretensioner having a fracture connection-type rack gear, according to the present invention, comprises: a housing having a receiving space; a pinion gear which is provided in the receiving space, and which is connected to a rotation shaft of a spool having a seat belt webbing wound thereon, and is rotated by the rotation of the spool; a micro gas generator for generating explosive power in response to an impact from outside; a transport pipe, one end of which is connected to the micro gas generator, and the other end of which is formed with an opening so as to be connected to the receiving space; a plurality of ball members which are provided in the transport pipe, and which are transported to the receiving space by the explosive power of the micro gas generator; and a rack gear which is provided in the receiving space in a fixed state so as to be fixed by a fixing part, and which is engaged with the pinion gear as the fixing part is fractured by the ball members transported to the receiving space by the explosive power of the micro gas generator, and which rotates the pinion gear by means of the remaining thrust of the ball members in a direction in which the webbing is introduced.

Description

technical field [0001] The present invention relates to a pretensioner, and more particularly, to a pretensioner including a rack gear engaged with a pinion to tighten a webbing as a plurality of spherical members delivered by an explosive force of a gas generator breaks a fixing portion. Background technique [0002] When people are riding in vehicles or appliances, collisions between vehicles or collisions with other objects will cause the occupants to leave the driver's seat, thus causing death or serious injury. In order to prevent the above situation, various safety devices are installed on the vehicles or appliances device. [0003] The most representative safety device is a seat belt, by which the lower abdomen and chest of a person riding in the vehicle or appliance can be stably fixed to the seat belt. [0004] However, when the amount of impact generated by collisions between vehicles or other objects is greater than a certain level, injuries often occur even if s...

AI Technical Summary

Problems solved by technology

[0010] A load limiter is used to draw out the webbing to a certain extent to prevent the above damage, but if the gas is not completely exhausted from the pretensioner as mentioned above, it hinders the movement of the rack and therefore the rotation of the pinion connected to the reel, with the result that It is impossible to draw out the ribbon

[0011] The above-mentioned hindrance to the webbing lead-out may cause the above-mentioned problem, that is, when the load limiter is operating, it will cause an overshoot load to the webbing's working load

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