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Seat Belt Pre-tensioner with Load Limiter
 
 
DESCRIPTION
The seat belt system is equipped with pre-tensioner mechanism, load limiter mechanism, and ELR mechanism.
 
 
STRUCTURE
ELR shaft (torsion bar)BobbinLock portion
Ring gearPinion gearGas generator
Sealing elementStopperSpacer
SnakePipe
Pre-tensioner mechanism cross sectionELR mechanism portion cross section
 
 
PRE-TENSIONER MECHANISM
  • In a frontal collision that exceeds the specified limit, air bag sensor unit detects the collision, transmits an electrical signal to gas generator in manifold case, and activates gas generator. Gas is generated.
    Pre-tensioner mechanism cross sectionELR mechanism portion cross section
  • The pressure of the generated gas moves the snake inside of pipe . The snake then presses ring gear which is engaged to the pinion gear .
  • The rotation of the ring gear rotates the ELR shaft in the retracting direction of the seat belt. Seat belt is retracted.
 
 
LOAD LIMITER (ELR) MECHANISM
  • In a collision, when ELR shaft is locked, a load caused by impact is applied to webbing .
  • When a load is continuously applied to webbing and reaches or exceeds the specified level, a rotating force is applied to ELR shaft that is engaged to lock portion and bobbin . ELR shaft twists.
  • As ELR shaft is twisted, webbing is pulled out while keeping a certain level of tension and easing the impact to the chest of front seat passenger.