Emergency locking type safety belt retractor with pretensioning function

Abstract

The invention relates to the technical field of safety belt reactor and particularly relates to an emergency locking type safety belt retractor with a pretensioning function, which comprises a rack device, a power device, a coil spring assembly, a pre-tensioning gear, a U-shaped frame, a belt coiling cylinder, a force limiting rod, a check wheel, a locking claw, a return spring, a belt sensing assembly, a vehicle sensing assembly and a cover. The emergency locking type safety belt retractor is characterized in that shafts at the left end and the right end of the pre-tensioning gear are respectively connected a shaft hole in the coil spring assembly and the left end of the force limiting rod in the belt coiling cylinder; the rack device in linear movement is arranged beside the pre-tensioning gear, one end of the rack device corresponds to the meshing position of the pre-tensioning gear, the rack device is meshed with the pre-tensioning wheel in the running process of the rack device, and the power device is arranged at the other end of the rack device. Compared with the prior art, the emergency locking type safety belt retractor has the advantages that as a clutch assembly is not arranged, the structure is compact, and also the volume of a pre-tensioning mechanism is reduced; and as a clutch is eliminated, the energy loss is reduced, the pre-tensioning time is shortened, and further the pre-tensioning efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of safety belt retractors, in particular to an emergency locking safety belt retractor with a pre-tensioning function. Background technique [0002] Ordinary safety belts have been widely used in various automobiles. Improvements have been made on the basis of ordinary safety belts to produce pre-tensioned safety belts. When moving forward, the webbing is first tightened to eliminate the gap between the driver and the passenger and the webbing, the occupant is tightly tied to the seat, and then the webbing is locked, so that the forward leaning distance of the driver and the passenger is further reduced. Protect drivers and passengers more effectively. [0003] There are various forms of pretensioned safety belts in the safety belt field, but there are two types of the most widely used ones, one is a ball type pretensioned safety belt, and the other is a rack and pinion type pretensioned safety belt. [00...

AI Technical Summary

Problems solved by technology

[0004] The existing rack-type pretensioned safety belts are all equipped with clutches. The main reason for this depends on the use requirements of the pretensioned safety belt. When the pretensioning function is not triggered, the rack cannot be in contact with the gear, otherwise it will affect the The normal pull-out and retraction of the retractor affects the normal use of the seat belt

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