TRW (trw.com) is launching its next generation SPR4 seat belt assembly for global applications, ranging from A-segment cars up through sport utility vehicles. The SPR4 (the letters stand for “Snake Pretensioner Retractor”) uses a plastic piston for transferring tensioning torque rather than a metal one.
Explains Norbert Kagerer, TRW vice president of Occupant Safety Systems engineering, “The lighter-weight plastic material allows the tensioning force to be generated more quickly than with conventional systems. Secondly, the damping behavior of the plastic snake allows the initial peak force, when impacting the pinion, to be significantly lower compared to conventional systems where two rigid steel elements impact on each other.”
That is, when the seat belt system is triggered by the vehicle sensors, a pyrotechnical gas generator releases gas that builds up pressure in the guiding tube, propelling the snake-like plastic piston into a pinion, that transmits torque to the belt retractor spool, thereby pretensioning the belt. This happens in 10 msec.
ZF TRW Active and Passive Safety Technology Division
Here’s a look at how Johnson Controls creates leading interiors as well as cool ideas for clever products.
Airbags are seemingly everywhere on the interior of vehicles. But what about on the outside? One day we could see them there, too.
Plenty of interior components are injection molded. But some companies—such as VW—are using a process for trim pieces that both mold a component and cover it in fabric in a single molding process. And it is coming to the U.S. in the not-too-distant future.