Category: Automakers

What Pulls The Pretensioner?

2023
Video: What Pulls The Pretensioner?
Video: Seatbelt Pretensioner in Super Slow Mo - The Slow Mo Guys 2023, February
What Pulls The Pretensioner?
What Pulls The Pretensioner?
Anonim

Only a seat belt can “slow down” a person in the event of a collision and an airbag deployment, provided that it is tightly tensioned - much more than with a quiet ride. Therefore, in the late 80s, the so-called pretensioners appeared.

The essence of the idea is that an asterisk is put on the axis of the spring-loaded coil winding the belt, which rotates with a set of balls. They are pushed through the tube by powder gases from a special squib. The latter works in parallel with the pillow holder, instantly choosing the slack of the belt. And so that the rider does not catch his breath, the axis with a certain effort on the tape (about 400 kgf) is twisted like a torsion bar, limiting the amount of tension.

Image
Image

Such pretensioner schemes have been used for quite some time (and now they are still not a thing of the past), but the designers found flaws in them too. The three-point seat belt, as you know, consists of two branches - waist and diagonal. Moreover, the tape passes twice through the loop (on the stand and in the buckle), bending around them at an angle of about 180 ° and also fits snugly on the clothes. Therefore, a single pretensioner does not provide uniform tension on both branches. So there were schemes (in particular, on Renault cars) with two linear pretensioners.

Here, the cartridges are fired into the pistons with which the belt lock and a special unit with a lower attachment point are connected.

Recently, a number of companies have been introducing hazardous systems (Pre Safe). If the sensors detect a threat of collision, they will pull the riders to the seats in advance. But not with a disposable squib, but with an electric motor in the inertial coil mechanism. Then the belts will relax to their original state, without restricting your movements.

Popular by topic

New

Editor'S Choice
Best reviews for the week
Popular for the day
  • Fiat Panda: Panda, Bella
    2023

    Why do Italians love Panda so much? For the price of course. Entering its third life, the new Panda entrusted its steering wheel to me, as one of the first possible buyers

  • Additives To Gasoline: How To Drink Gasoline?
    2023

    Additives rating for gasoline - we test universal and octane correctors, moisture removers from a gas tank, an injector cleaner, a motor fuel amplifier, we compare the power, fuel consumption and washing ability of the additive. Let's figure out which fuel additive improves the quality of gasoline

  • VW Passat Alltrack: Any Roads Are Dear To Us
    2023

    The coming summer universal wagons in Russia will have to make room: among them will be a newcomer - Volkswagen Passat Alltrack. The prefix to the name literally translates as “all roads / routes / trails”

  • In The Right Light
    2023

    Headlights of commercial vehicles these days can be halogen, xenon or LED. Which ones to prefer?

  • Chevrolet Tahoe: White Steamboat
    2023

    The Chevrolet-Tahoe has not been delivered to the Russian market for more than a year: the manufacturer decided that we had cooled down to the original American technology. However, now the full-size SUV is again presented in the salons. Good reason to meet you

  • Race Of The Stars: Ladygin Went Down In History
    2023

    The athlete from Yekaterinburg won the Race of Stars for the third time and forever won the legendary Crystal Tire prize