Double-motor two-way pre-tightening active loosening type safety belt

Abstract

The invention discloses a double-motor two-way pre-tightening active loosening type safety belt comprising a mounting box, the mounting box comprises a first mounting box and a second mounting box; pre-tightening motors and a winding shaft are arranged in the mounting box; the pre-tightening motors are fixedly connected with the tops of the two sides of the inner wall of the mounting box; the output shaft end of the pre-tightening motor penetrates through one side of the mounting box; a pinion is arranged at the top of one side of the mounting box; the pinion is fixedly connected with the output shaft end of the pre-tightening motor, the two ends of the winding shaft are sleeved with locking discs, the two locking discs are located in the mounting box, the outer sides of the two locking discs are sleeved with locking rings, and the two locking rings are fixedly connected with the inner walls of the two sides of the mounting box correspondingly. By arranging the two pre-tightening motors and other structures, two-way pre-tightening can be achieved, the pre-tightening time is shortened, meanwhile, active loosening can be achieved, and harm of safety belt tension to a wearer is reduced.

Description

technical field [0001] The invention relates to the technical field of safety belts, in particular to a dual-motor bidirectional pretensioning active release safety belt. Background technique [0002] Car seat belts are recognized as the cheapest and most effective safety device. When a car collides, the seat belt can restrain the occupant in time, avoiding secondary collision between the occupant and the steering wheel or instrument panel, and preventing the occupant from rushing out of the vehicle to cause death or injury. The ideal working process of the seat belt is: first, tighten it in time - "press" the person on the seat without hesitation at the first moment of the accident; then, relax moderately - wait until the peak of the impact force passes, or the person can When protected by the airbag, loosen the seat belt properly to avoid rib injuries due to excessive tension. According to the above-mentioned working process of the seat belt, although the seat belt can g...

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Problems solved by technology

[0004] Although the above-mentioned invention can shorten the time to eliminate the seat belt gap, there are still some problems. First, when the car collides, the peak value of the tension of the shoulder and waist seat belts is different, and the time to reach the peak is also different, and this invention does not consider Due to the difference in the tension of the waist and shoulder seat belts, when the tension of the seat belt reaches the peak value, the preload cannot be removed in time, which may easily injure the occupant; secondly, the life of the pulley is short, the transmission efficiency is low, and the transmission ratio is unstable, which makes the system The stability and reliability are not high, and the pre-tightening force is uncontrollable; again, the relaxation of the traditional seat belt after pre-tightening is realized by the material properties of the force-limiting shaft. Only when the tension of the seat belt reaches a specific value, the steel force-limiting shaft will It will be deformed and relaxed, and the inertial force received by different members in a car collision is different, and the peak value of the seat belt tension is also different, so this relaxation method is not always effective. In addition, the force limiting shaft is a one-time use. Once it works, it must timely replacement

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