SRS - Seat Belt TENSIONER

ELR Seat Belt Tensioner with Load Limiter 

When the tensioner operates, it quickly tightens the seat belt, and improves the occupant's initial restraining effect (preventing the occupant's body being moved forward.) The load limiter keeps the restraining effect if the load exceeds the preset value. It keeps the restraining effect while sending out the seat belt, to protect the chest of the passenger. The ELR tensioner with load limiter is composed of a gas generator, a ring gear, a pinion, an ELR locker, and a spool.

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Operation of Seat Belt Tensioner 

1. The gas pressure in the gas generator circulates the ball in the pipe, and presses it against the ring gear. By this, the ring gear is connected to the pinion.

Courtesy of HONDA, U.S.A., INC.

2. Passing of the ball rotates the ring gear along with the pinion. Then, the spool that is connected to the pinion rotates and rewinds up the seat belt.

Courtesy of HONDA, U.S.A., INC.

Operation of Load Limiter 

3. A sudden sending out of the seat belt operates the lock mechanism, engaging the pawl to the frame gear. That locks the locking base and its integrated torsion bar and spool.

Courtesy of HONDA, U.S.A., INC.

4. When a certain amount of load is added to the seat belt when the locking base is locked, the torsion bar is twisted, and the spool is rotated, then the seat belt is sent out.

Courtesy of HONDA, U.S.A., INC.

5. The seat belt is sent out, the ring gear pushes back the ball, and the ring gear is released from the pinion.

Courtesy of HONDA, U.S.A., INC.