Belt force limiters
The belt force limiter is a device that limits the maximum force of the seat belt on the occupant in the event of a collision .
The belt force is limited by twisting a torsion bar in the belt retractor or by tearing a tear seam in the seat belt. The restraint force acting by the seat belt on the occupant is reduced by the belt force limiter to the biomechanically tolerable limit values. The aim is, for example, to prevent ribs from breaking due to the restraint force of the belt strap running diagonally across the chest or from the head angle from exceeding certain limit values.
Depending on the diameter of the torsion bar (for example 9 mm), different levels of force limitation can be achieved. The aim of the force limitation is to reduce the stress on the occupant in the head and chest area through reduced restraint forces.
There are several force limiter levels (“soft” to “hard”) for optimal adjustment and coordination of the restraint system (also in conjunction with the airbag ). The intention is to use the maximum forward displacement path available for the occupant in the passenger compartment. A seat belt force limiter for the front passenger can be designed to be “softer”, as the lack of a steering wheel usually means that there is more forward displacement.
In 2016, newly registered cars were fitted with belt force limiters on the front seats. Belt force limiters were only available at an additional cost for rear seat occupants.
See also
Individual evidence
- ↑ More security for backbenchers. Zeit Online, March 1, 2016, accessed January 27, 2020 .