Mercedes-Benz celebrates 25 years passenger airbag !
Mercedes-Benz had already introduced the worldâ€™s first fully operational driver airbag in a production vehicle in 1981 â€“ also in a 126 model series S-Class. The Supplemental Restraint System (SRS), consisting of driver airbag and belt tensioner, was available as an option for DM 1525.50. It was the result of the rigorous work undertaken by corporate research that had started in the mid-1960s. When sensors detect a collision, a propellant charge is ignited and within a few milliseconds the nitrogen produced by this process inflates a bag made out of a special woven material. The resulting cushion protects people against impacting the dashboard. While the driver airbag is housed in the steering wheel, the front passenger airbag in its early manifestations occupied the spot where the glove compartment would normally have been. Thanks to refined and smaller airbag modules vehicles later regained the glove compartment.
The front passenger airbag introduced in 1987 utilis
Research in the interest of safety
Mercedes-Benz has shaped not only the history of the modern airbag to a significant extent, but the development of vehicle safety in general: this includes such pioneering innovations as the safety body shell with rigid passenger cell, front and rear crumple zones as well as the safety steering column. Airbag technology expanded the arsenal of passive safety by another powerful tool. Mercedes-Benz research on the airbag began in 1966, with initial practical trials starting in 1967.
Mercedes-Benzâ€™s fundamental goal was to further increase vehicle safety. The development of the airbag was also driven by plans in the United States of America to prescribe an automatic occupant protection system for all cars from 1969. Airbags that inflate during an accident were seen as a very promising technology. The principle had already been patented in the 1950s. The principal pioneers were the German Walter Linderer (Patent DE 896312 of 6 October 1951) and the American John W. Hedrik (U.S. Patent 2649311 of 18 August 1953).
But it was a rocky road from the concept to production-ready technology. Particularly the necessary sensor systems and gas generation continued to present major challenges to the developers. This was evident in the solutions from American manufacturers, which equipped their first test fleets with compressed-air operated airbags as an alternative to seat belts: this concept led to serious injuries and in a few cases even fatalities. For this reason the engineers at Mercedes-Benz chose a different approach to arrive at the â€œinflatable container in a folded state, which automatically inflates in the event of dangerâ€? (Lindererâ€™s description of his invention in the patent application): the airbag was not to replace the restraining effect of the seat belt, rather it was to supplement it. Tests showed that the airbag only achieved maximum effectiveness in combination with the safety belt. In addition, the gas was not stored under high pressure, but generated on demand by igniting a propellant charge.
The findings of Mercedes-Benz research were formulated in patent no. DE 2152902 C 2, which former Daimler-Benz AG filed on 23 October 1971. This patent application was the key document for all subsequent airbag development at Mercedes-Benz. It already described the operating principle of the new technology as it was to be implemented in series production ten years later: sensors register the particularly severe deceleration common to collisions and activate the airbag mechanism. This ignites a propellant charge (at the time consisting of sodium azide, potassium nitrate, and sand), which deflagrates instantaneously to form mainly gaseous nitrogen and every a little water and oxygen.
The airbags for driver and front passenger quickly caught on in the entire industry as a life-saving technology. As airbag modules became smaller and smaller thanks to the rigorous work of the engineers, it was possible to incorporate them in other areas of a vehicle to also provide comprehensive protection in the event of a side impact: in 1993, Mercedes-Benz presented a study of a side airbag; in 1995 the side airbag became available as an option, initially in the E-Class. Further innovative steps were the side curtain airbag, the head-thorax sidebag and adaptive airbags that operate in different stages depending on the expected severity of the accident and provide optimal protection for the occupants.
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