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Vehicle safety
Functional description of front belt tensioner
The belt tensioner is activated by balls moun-
ted in a feed tube.
When the belt tensioner is triggered, a pyro-
technical propellant charge ignites. It sets the
balls in motion and drives them into the ball
retainer via a gearwheel.
The belt reeling device is driven by the kinetic
energy of the balls, thus reeling in the belt.
14
Propellant charge
Belt reeling device
Ball retainer
Mechanical trigger unit
Belt
Feed tube
SSP 192/124
Gearwheel
SSP 192/125
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