PRE-TENSIONER SEAT BELT CONSTRUCTION/OPERATION

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Construction

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Operation

Normal (Seat Belt Pretensioners Not Operating)

•  Normally, the clutch roller installed to the outer circumference of the spindle sits in the recess of the gear and does not interfere with the spindle.

•  The gear does not rotate when the belt is pulled or retracted because the spindle and gear are not engaged.

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Seat Belt Pretensioners Operating

1.  When an operation signal is received from the SAS control module, the gas generator produces gas. Due to the pressure from the gas, the piston in the cylinder is pressed up.

2.  The gear rotates while the piston moves up.

3.  Based on the gear rotation, the clutch roller in the gear presses against the spindle.Due to this, the gear and spindle are engaged.

4.  The belt is retracted in conjunction with the gear rotation.

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