Active pre-fastening safety 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 seat belt device, in particular to a seat belt device with an active pre-tensioning function, and belongs to the technical field of occupant injury protection in automobile collision accidents. Background technique [0002] The seat belt is an indispensable accessory for the occupant restraint system. my country's automobile collision safety regulations stipulate that all automobiles must be equipped with seat belts. Related experimental studies also show that the use of seat belts is the most effective way to reduce or avoid injury in the occupant restraint system. [0003] Generally, for the comfort of the occupants, the pre-tightening force of the seat belt should not be too large. There is always a certain gap between the seat belt and the human body. When the occupant's clothes are thick, the gap will be larger. In a collision, this gap will reduce the effective range of the seat belt and reduce the effectiveness of the seat ...

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 has a certain effect on occupant damage protection, but it does not 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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