What are some inconspicuous parts on a car that have a high technical content?

The number of parts on a car is basically maintained at around 30,000. From screws as small as nails to chassis steel frames, are there some inconspicuous parts with a particularly high technical content?

Let's talk about the simplest one, the seat belt! Seat belts are almost in every car, and car owners are accustomed to it, but the technical content of seat belts is very high, and seat belts are still evolving to this day; seat belts look like the simplest and most inconspicuous, right?

Just a nylon belt with a retractor? In fact, there is an angle-sensitive device inside the retractor. As long as the nylon belt is pulled out at a speed that exceeds the threshold set by the angle-sensitive device, the angle-sensitive device will instantly lock the nylon belt; ordinary seat belts can withstand a tensile force of about 10,000 Newtons, but once it exceeds this value, it is still easy to cause injury; and a higher-level seat belt is a seat belt with a damping function. When the tension reaches the limit, this kind of seat belt will release some length to provide relative buffering.

Of course, more advanced seat belts such as preloaded force-limited seat belts have also been designed to further improve the safety level. Although seat belts are the most common parts on cars and look quite simple, they are actually very technical.

In short, there is no low-tech part on the car. Whether it is eye-catching or inconspicuous, they are the result of the hard work of several generations of engineers, continuous accumulation, precipitation, and improvement. Therefore, the parts on the car are all very technical. Behind each part, there is actually a past worth recalling!