Torsion bar support structure of seat belt retractor

Abstract

Provided is a torsion bar support structure of a seat belt retractor capable of smoothly rotating a rotary torsion bar and preventing deformation of the torsion bar due to moment applied to the torsion bar by coupling support members to both ends of the torsion bar. The torsion bar support structure of a seat belt retractor includes a housing constituting a main body of the seat belt retractor, a guide drum rotatably coupled to the housing, a torsion bar inserted into the guide drum, a base member fixed to one side of the housing, a locking member fixed to the other side of the housing, and a cylinder accommodating a piston therein to rotate a gear member fixed to the base member, the structure including: a bearing member coupled to the gear member; and a cap surrounding a cover fixing shaft projecting from the locking member, wherein the bearing member and the cap rotatably support the torsion bar when rotation moment is applied in a circumferential direction and an axial direction of the torsion bar. Since a torsion bar is rotatably supported by a bearing member and a cap, the torsion bar can be smoothly rotated by moment applied in an axial direction thereof. In addition, even though axial moment is applied, it is possible to prevent position variation and deformation of the torsion bar. Further, contact resistance between a connector and a projection can be reduced when the torsion bar is rotated, and thus the torsion bar can be smoothly rotated.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 2007-0048835 filed on May 18, 2007, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a torsion bar support structure of a seat belt retractor, and more particularly, to a seat belt retractor capable of stably supporting a torsion bar inserted into a guide drum of a seat belt retractor Torsion bar support structure of the torsion bar, so that the webbing can be released or rewound smoothly. Background technique [0004] Seat belts or air bags are installed in vehicles to safely protect drivers and passengers in traffic accidents. Such a seat belt is a basic safety device installed to operate at the time of vehicle accidents such as frontal collision, side collision, rollover, etc., thereby maximally protecting a driver and a passenger. [0005] A widely used seat bel...

AI Technical Summary

Problems solved by technology

[0027] In addition, assembling the seat belt retractor requires a lot of assembling time, thereby reducing assembling efficiency

Moreover, the complexity of the parts constituting the seat belt retractor makes it difficult to manufacture the seat belt retractor, thereby increasing the manufacturing cost

In addition, when the webbing of the seat belt retractor is rewound, the webbing may not operate successfully and the occupant may not be aware that the seat belt is malfunctioning

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