Active pre-tightening safety belt retractor with dynamically adjustable force limiting working condition and speed reducing mechanism

Abstract

The invention relates to an active safety belt retractor with a dynamically adjustable force limiting working condition and a speed reducing mechanism. The retractor comprises a frame and a mandrel, a speed reducing mechanism is mounted at one end of the mandrel; a motor is mounted at the outer end of the speed reducing mechanism; a braid is wound on the periphery of the mandrel; a controller is arranged on the frame; the controller generates different output signals according to different working condition states, the output signals trigger the motor to rotate and output torque, the speed reducing mechanism receives the output torque of the motor, then decelerates and increases the torque, and then transmits the torque to the mandrel and the fixed shaft, so that the woven belt force on the mandrel is controlled. The advantages are shown in the specification; through cooperation of the controller, a motor and the speed reducing mechanism, the speed reducing mechanism can rotate forwards and backwards, the braid force in the process of each working condition state is dynamically adjusted in real time in a targeted mode, meanwhile, the coaxial arrangement mode is adopted, the structure is simple and compact, the motor driving efficiency is high, the speed reducer transmission efficiency is high, the mechanism is simple, and the cost is lower.

Description

technical field [0001] The invention relates to the technical field of retractors, in particular to a high-efficiency and high-load-capacity deceleration mechanism and its application to a dynamically adjustable active pretensioning safety belt retractor under force-limiting conditions. Background technique [0002] With the mandatory installation and popularization of the automatic emergency braking system (AEB) in automobiles, there is a risk that the airbags will not be able to provide effective protection and even cause serious injury to the occupants if the occupants sit out of their positions due to emergency braking. Studies have shown that in order to avoid the above risks, the motor-driven active pretensioning seat belt needs to provide a pretensioning force of more than 800N. However, the maximum preload of the prior art is usually in the range of 200-400N. [0003] The transmission efficiency of the reduction mechanism is one of the core factors restricting the m...

AI Technical Summary

Problems solved by technology

Patent document CN202110383280.9 provides a method for dynamic adjustment of force limit level by using motor drive. In the implementation case, a planetary gear reducer is used, which also has the problems of complex structure, high cost and insufficient load capacity.

Images