pre.seat.belt.预紧式安全带技术解析.doc

预紧式安全带技术解析 pre seat belt
Characteristics of safety belt pretensioner is the moment when the car collision accident, not when the occupant moved forward it will first tensioning ribbon, immediate occupant tightly tied to the chair, and then lock the ribbon to prevent the occupant leans forward, effectively protect the safety of passengers. Retractor mon safety belt pretensioner seat plays a main role in the different bands, in addition to ordinary retractor retractable webbing function, but also has when the speed changes sharply, to strengthen to the occupant binding in or so, therefore it has the control device and the pre tensioning device. Control device has two kinds: one kind is electronic control device, the other is a mechanical control device. Pre tension device has a variety of forms, pre tensioning mon is an explosion, gas by the initiator, gas generating agent, a conduit, a piston, a rope and a driving wheel. When the vehicle is collided pre tensioning device when excited, gas sealing tube at the inner bottom of the initiator immediately bustion, detonated the same seal within the duct gas generating agent, a gas generating agent immediately generate a lot of gas expansion, forcing the piston to move upward pull rope, rope belt driven wheel rotation number driving wheel to make the retractor reel rotate the webbing is on the reel, the ribbon is the pull back.