PRE-TENSIONER SEAT BELT CONSTRUCTION/OPERATION
BME081057630T01
Construction
.
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1
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Retainer
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2
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Flywheel
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3
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Hook spring
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4
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Lock gear
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5
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Pawl spring
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6
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Torsion bar
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7
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E-ring
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8
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Locking base
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9
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Pawl
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10
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Stopper
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11
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Spacer
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12
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Housing
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13
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Guide drum
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14
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Holder
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15
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Sensor case
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16
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Weight
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17
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Actuator
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18
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Chamber
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19
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Clutch gear
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20
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Gas generator
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21
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Case
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22
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Sealing pin
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23
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Pin holder
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24
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Inlay
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25
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Strip cutter
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26
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Strip
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27
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Clutch sleeve
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28
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Clutch pin
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29
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Chamber plate
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30
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Spring case
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31
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Bush
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32
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Spring
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33
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Spring cover
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Operation
Before activation (Normal condition)
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• The clutch sleeve is separated from the movement of the clutch gear.
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• The clutch gear is connected to the torsion bar through in the guide drum, and rotates freely according to the movement of the belt.
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1
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Strip
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2
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Clutch sleeve
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3
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Torsion bar
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4
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Clutch gear
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5
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Belt
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During activation
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• The pre-tensioner operates as follows.
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1. When the pre-tensioner receives a signal to operate from the SAS unit, the gas generator releases a gas, which increases the pressure of the chamber inner. This pushes the strip and causes it to expand.
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2. The clutch sleeve rotates counterclockwise according to the movement of the strip.
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3. The clutch pin engages the clutch gear by the rotation of the clutch sleeve, and then the clutch gear rotates the torsion bar and the guide drum together, and retracts the belt.
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1
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Strip
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2
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Clutch sleeve
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3
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Torsion bar
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4
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Clutch gear
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5
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Belt
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6
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Clutch pin
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7
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Gas
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