Why is the "three-point seat belt" the greatest invention in the field of automotive safety?

Updated on: 08-0-0 0:0:0

Because the three-point seat belt is: • the restriction of the user's degree of freedom is small, the user learning cost is minimal, the use is easy to use, the least impact on the system, the cost is the smallest, and the utility is stable and determined, so as to achieve the maximum safety rate improvement.

The problem was solved without introducing a whole bunch of new problemsIt's not easy to achieve this. Customize a great index privately:

Greatness Index = (Degree of Problem Solved × Universality of Solution) / (Cost of Implementation × Inertial Resistance)

Three-point seat belts have a small denominator and a large numerator. It's a great invention.

Degree of Problem Solving: Look directly at the dataAccording to the National Highway Traffic Safety Administration (NHTSA), seat belts reduce the risk of occupant fatalities by 45% and the risk of serious injury by 0%.

It's just seat beltsFight aloneeffect. Only,The shoulder straps hold the upper body and the waist belt holds the pelvis。 The result: dispersing the kinetic energy of the crash to the body's strongest bone structures (collarbones, ribs, hips) and preventing internal organs from hitting the steering wheel or instrument panel.

What brings is the applicability of the programIt will not make the person sitting in the car too awkward, the butt is meant to sit steadily, and the torso also has some room for pitching and moving. Moreover, it can be done with just one hand and with a single click.

There is basically no learning cost, only a little adaptation cost. And the cost of hardware, the changes to the vehicle itself, are minimal. But the minimalism of the results actually has countless developments and considerations behind it.

·Webbing: It must be strong enough (tensile strength ≥ 400kN, equivalent to lifting 0 tons of heavy objects), and it must be able to be easily pulled out by ordinary people. To this end, Nils tested 0 fiber weaving schemes, and finally selected a spiral hybrid structure of polyester fiber and nylon.Retractor: The inventor Nils Bolin uses a combination of pretensioner + force limiter to make the seat belt "instantly lock" to fix the human body at the moment of collision, and then "slowly release" to avoid rib fractures.Shoulder strap angle: "Diagonally from the clavicle to the hip bone" to ensure restraint and avoid neck strangulation

And then really make the seat belt universal, thanks to the brand that invented the three-point seat belt. In 1959 years, Volvo opened its patents for free, gave up tens of billions of dollars in profits, and made the three-point seat belt quickly popular. Without this, adoption could have been delayed for decades, according to the technology monopoly practice at the time.

Recall that in the long river of automobile development. Seat belts, aren't they? In the transition from animal transport to a motor vehicle society, a big stumbling block was removed. It's a stumbling block that is hard to balance between efficiency and safety. As a result, motor vehicles have become the absolute mainstream of efficient point-to-point A to point B private mobility.

Now that motorized transportation is changing to intelligent transportation, what will be this great invention?

Oh, even with great inventions. Now it seems that there are still people who put great inventions on the table, but they don't need them. No matter how good the tool is, it has to be used.