Nissan Rogue (T33) 2021-Present Service Manual: System Description :: Component Parts

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)		Bobbin		Lock portion
	Ring gear		Pinion gear		Gas generator
	Sealing element		Stopper		Spacer
	Snake		Pipe
	Pre-tensioner mechanism cross section		ELR 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 section

  ELR 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.

Double Pre-tensioner Seat Belt

DESCRIPTION

The system combines lap pre-tensioner mechanism for lumbar seat belt and pre-tensioner seat belt with load limiter. The system upgrades passenger restraint by reducing lumbar movement during a frontal collision.

STRUCTURE

	Gas generator		Wire		Piston
	Pipe		Lap anchor		Seat belt

LAP 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 pipe, and activates gas generator. Gas is generated. The pressure of the generated gas moves the piston inside of pipe toward pipe front direction, and retracts wire.

• Lap anchor is installed to end of the wire and end of seat belt is connected to lap anchor. The wire therefore retracts seat belt.

• When piston stops, clutch mechanism integrated to piston prevents piston from moving in the original direction. Wire and lap anchor therefore remain in the retracted status.