| 摘要 |
A motorized buckle pretensioner for the safety belt can use semi-permanently repeatedly without the need to discard after 1 time operation and replaces and is saved of the maintenance cost. A motorized buckle pretensioner for the safety belt comprises the electric motion medium(30) delivering the power of the motor(20) and the motor fixed on the Seat frame(4) towards the tip-end part of the buckle of the safety belt; the encapsulated type casing(40,50) of the pair the motor and electric motion medium(30) are supported so that the motor and electric motion medium be steadily smoothly operated on the Seat frame with fixing; and the controller which controls the operation of the motor in order to rotate the motor in the impact of vehicle accident and situation termination and it instantaneously catches the safety belt connected in the buckle(14) as the prescribed distance and it pulls or it can restore back to its original state. The electric motion medium includes the worm(31) which is fixed on the motor shaft of the motor and is rotated and has the pivot center shaft fixed on the Seat frame as the axis center in the rotation of the worm and the rotation is comprised in the constant rotation angle range of the worm wheel(32) reducing speed and rotates.
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