Design and Analysis of Pretension Performance of Seatbelt Retractor

The pretension function of seatbelt retractor has been widely used in the front row of passenger vehicles. With the release and adoption of CNCAP 2018, the equipment rate of pretension function of the retractor in the rear row has also increased significantly, and the pretension spec adopted by all the seats has gradually become a trend. In this paper, take the pretension function of the retractor as the research object, through the theoretical calculation model of pretension, the pretension amount, pretension force and pretension energy of the retractor are designed. Finally, through the pretension performance verification test, it is found that the pretension amount, pretension force and pretension energy meet the performance of design requirements, and they are consistent with the theoretical model design values. Meanwhile, it provides a theoretical design method for the pretension performance of the retractor, and also provides ideas for the pretension performance design of other types of retractors.