Seat belt retractor and seat belt apparatus employing the same

Abstract

A seat belt retractor which is still compact in the axial direction and the radial direction even with a tension reducer has a reducer spring (14) that always biases a bush shaft (12), which rotates together with a spool, to rotate in the belt winding direction, and a main spring (17) that can selectively bias the spool in the belt winding direction. A lever (12a) of the bush shaft (12) and a Geneva wheel (18) compose a memory means (19) for memorizing the rotational amount of the spool in the belt winding direction relative to the ratchet gear (15) when the main spring (17) does not bias the spool in the belt winding direction. The memory means (19) is arranged in the ratchet gear (15) so that the retractor with the tension reducer is formed to be compact in the axial direction and the radial direction.

Description

technical field [0001] The invention belongs to the technical field of seat belt retractors used in seat belt devices equipped on automobiles and other vehicles to protect occupants through seat belt restraints, and particularly belongs to the following technical field: it has the ability to control the retractor when wearing a seat belt under normal circumstances. The utility model relates to a seat belt retractor of a tension regulator which winds the active force of a spring device of the seat belt and controls the tension of the seat belt, and a seat belt device having the seat belt retractor. Background technique [0002] Conventionally, a seat belt device installed on a vehicle such as an automobile protects the occupant by restraining the occupant through the seat belt and preventing the occupant from inertial movement from the seat in an emergency such as a vehicle collision or when the vehicle undergoes a large deceleration. In this seat belt device, a seat belt ret...

AI Technical Summary

Problems solved by technology

However, since two Oldham wheel mechanisms are used and must be set in an engaged state, not only the number of parts increases, but also a problem arises that the structure becomes complicated

And since the stoppers provided on the two Geneva wheel mechanisms need to be disengaged / connected to each other, it is impossible to rotate each Geneva wheel mechanism by one revolution.

Therefore, not only is it difficult to effectively reduce the tension when the seat belt is usually worn, but also it is difficult to reliably contact the two stoppers, and the action of the tension adjuster cannot be reliably and stably performed.

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