Menu +
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

FRONT PRE-TENSIONER SEAT BELT [TWO-STEP DEPLOYMENT CONTROL SYSTEM – US/CANADA SPEC.]

FRONT PRE-TENSIONER SEAT BELT [TWO-STEP DEPLOYMENT CONTROL SYSTEM – US/CANADA SPEC.]

SM2334174

id0810b4502100



Purpose

• The front pre-tensioner seat belt retracts and tightens the belt webbing (between front buckle and pre-tensioner seat belt) against the occupant’s upper torso to hold the occupant firmly in the seat and protect the occupant during a collision.



Function

• The front pre-tensioner seat belts operate (deploy) based on the operation signal from the SAS control module to instantly retract and tighten the belt webbing, restraining the driver and front passenger.
am3zzn00007530



Construction

• The front pre-tensioner seat belt is located in the retractor of the front seat belt.
am2zzn00002071
• The front pre-tensioner seat belts consist of the following parts shown in the figure:
am3zzn00008156



Operation


Normal operation (pre-tensioner non-operation)

• The spool (retraction shaft) of the front pre-tensioner seat belt (1) is separated from the clutch pawl base (2).
• The spool of the front pre-tensioner seat belt rotates (4) in conjunction with the with drawl/retraction of the front seat belt (3).
am3zzn00007532


Pre-tensioner activation

1.The gas generator produces (1) gas when it receives an operation signal from the SAS control module.

2.The piston in the cylinder is pressed (3) by the generated gas pressure (2) and the gear and the clutch pawl base rotate (4).

3.The clutch pawl is pulled out and engaged (5) with the spool by the rotation of the gear and the clutch pawl base. The ring gear is engaged with the locking base and the force of the ball being pressed out is transmitted to the retraction shaft.

4.When the clutch pawl is engaged, the force of the pressed piston is transmitted to the spool and the spool rotates (6).

5.The front seat belt is retracted (7) by the rotation of the spool.
am3zzn00007533