Active pretensioner seat belt device

Abstract

The invention discloses an active pre-fastening safety belt device, and belongs to the technical field of passenger injury protection in vehicle collision accidents. The safety belt device comprises a direct current motor, a transmission system, a coiler and a braid external part; the direct current motor is connected with the transmission system for responding a control signal of an accident pre-fastening device to work; an output shaft of the direct current motor is connected with a planetary gear train of the transmission system; the planetary gear train transmits power to the outer gear of an isolator by a middle idle gear; the isolator is designed into a ratchet structure; a safe coupling sleeve is mounted between the ratchet and a spindle of the coiler so as to transmit the power to the coiler; and one end of the frame of the coiler is provided with an emergency locking device which is sensitive to the placing angle of the safety belt and the pulling-out acceleration of a braid, thus realizing the emergency locking of the active safety belt. The pre-fastening of the safety belt can be finished before an accident occurs, and eliminates the wearing gap of the safety braid, so the restraining performance of the safety belt on a passenger is increased in the collision accident, and the collision injury of the passenger can be obviously reduced.

Description

technical field [0001] The invention relates to a safety belt device, in particular to a safety belt device with an active pretension function, and belongs to the technical field of occupant injury protection in automobile collision accidents. Background technique [0002] Seat belts are an indispensable occupant restraint system accessory. my country's automobile collision safety regulations stipulate that all automobiles must be equipped with safety belts. Relevant experimental studies also show that the use of seat belts is the most effective way to reduce or avoid damage in occupant restraint systems. [0003] Generally, for the comfort of the occupant, the preload of the seat belt should not be too large, and there is always a certain gap between the seat belt and the human body. When the occupant's clothes are thicker, the gap will be larger. In the event of a collision, this gap will reduce the effective reach of the seat belt and reduce the effectiveness of the sea...

AI Technical Summary

Problems solved by technology

This preloading method occurs after a collision. The preloading time is short (20ms~30ms), the preloading length is short (40mm~80mm), and the preloading force is large (≈2000N). It is not obvious; and the ordinary explosive seat belt pretensioner may cause injury to the occupants by tightening the seat belt at the moment of collision

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