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Webbing retractor

a retractor and webbing technology, applied in the direction of vehicle safety belts, thin material handling, vehicle components, etc., can solve the problems of large number of parts and complex structure, complex shape of the ratchet tooth portion and complicated alignment of the lock pawl with respect to the ratchet wheel, so as to achieve simplified structure

Inactive Publication Date: 2008-08-28
KK TOKAI RIKA DENKI SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a webbing retractor with a simplified structure, an improved operating member, and a simplified limit load switch. The webbing retractor includes a force limiter mechanism that limits the load applied to a vehicle occupant in an emergency situation. The switching portion switches between a high load and a low load based on the operation of the operating member. The webbing retractor can be used in a variety of vehicles and is easy to install and operate.

Problems solved by technology

This is therefore a structure in which the cam plate and the lock pawl are interposed between the piston and the ratchet wheel, and there is a large number of parts and a complex structure.
Therefore, there is the possibility that the aligning of the lock pawl with respect to the ratchet wheel will become complicated.
Due thereto, there is the possibility that the shape of the ratchet tooth portion of the lock pawl will become complex.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

[0068]A first exemplary embodiment of the present invention will be described next by using FIG. 1 through FIG. 8.

[0069]A summary of the structure of a webbing retractor 10 relating to the first exemplary embodiment of the present invention is shown in a cross-sectional view in FIG. 5.

[0070]As shown in FIG. 5, the webbing retractor 10 has a frame 12. The frame 12 has a plate-shaped rear plate 14 which is fixed to a vehicle body. A leg plate 16 extends, substantially orthogonally to the rear plate 14, from one transverse direction end portion of the rear plate 14. In contrast, a leg plate 18 extends, in the same direction as the direction in which the leg plate 16 extends, from the other transverse direction end portion of the rear plate 14. The frame 12 has a substantially convex shape as seen in plan view.

[0071]A spool 20 serving as a winding shaft is provided between the leg plate 16 and the leg plate 18. The axial direction of the spool 20 runs along the direction in which the le...

second exemplary embodiment

[0127]A second exemplary embodiment of the present invention will be described next by using FIG. 9 through FIG. 12.

[0128]A webbing retractor 200 relating to the present exemplary embodiment has a structure which is substantially similar to that of the first exemplary embodiment, but differs with respect to the following points.

[0129]As shown in FIG. 9 and FIG. 10, at the webbing retractor 200 relating to the present exemplary embodiment, a stopper placement hole 202, which is shaped as a rectangular plate and serves as an engaged portion, is formed at a portion of the outer periphery of the lock ring 90. The lower end of the stopper placement hole 202 is open from the outer periphery of the lock ring 90. A stopper accommodating hole 204, which communicates with the circular hole 88, is formed at the base 86 so as to correspond to the stopper placement hole 202. A stopper 206, which is shaped substantially as a rectangular plate and serves as an operating member, is accommodated at ...

third exemplary embodiment

[0139]A third exemplary embodiment of the present invention will be described next by using FIG. 13 through FIG. 16.

[0140]A webbing retractor 300 relating to the present exemplary embodiment has a structure which is substantially similar to that of the first exemplary embodiment, but differs with respect to the following points.

[0141]As shown in FIG. 13 and FIG. 14, in the webbing retractor 300 relating to the present exemplary embodiment, the winding direction side surface 96A of the outer peripheral groove 96 at the outer periphery of the lock ring 90 is disposed horizontally. A piston accommodating hole 302, which communicates with the circular hole 88, is formed in the base 86 so as to correspond to the outer peripheral groove 96.

[0142]The cylinder accommodating hole 106 of the base 86 communicates with the piston accommodating hole 302. The piston 110, which is partially accommodated at the upper end portion of the cylinder 108 which is fixed to the inner side of the cylinder a...

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Abstract

To simplify the structure of a webbing retractor, at a second locking mechanism 44 of the webbing retractor, when a gas generator is not operated, a cam engages with an outer peripheral groove of a lock ring, and a limit load by a torsion shaft is made to be a high load. On the other hand, when the gas generator is operated, the cam is moved apart from the outer peripheral groove of the lock ring, and the limit load by the torsion shaft is made to be a low load. Because only the cam is interposed between the lock ring and a piston which is driven by the gas generator, the number of parts of the second locking mechanism can be reduced, and the structure of the second locking mechanism can be made simple.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 USC 119 from Japanese Patent Application No. 2007-050144, the disclosure of which is incorporated by reference herein.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a webbing retractor in which a force limiter mechanism limits, to a limit load, the load which is applied from a webbing to a vehicle occupant at the time of an emergency situation with respect to the vehicle.[0004]2. Related Art[0005]Among webbing retractors, there are those in which a torsion shaft limits, to a limit load, the load which is applied to a vehicle occupant from a webbing belt, and the limit load by the torsion shaft is alternated between a high load and a low load due to switching between a state in which a lock pawl meshes with a ratchet wheel and a state in which the lock pawl does not mesh with the ratchet wheel (see, for example, Japanese Patent Application Laid-Open (JP-A) No. 2005-1648).[0...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65H23/08B65H77/00
CPCB60R22/4676B60R2022/288B60R2022/286
Inventor NAGATA, TOMONORISUGIYAMA, MOTOKIMAEKUBO, YOSHIAKIAOKI, SAYURI
Owner KK TOKAI RIKA DENKI SEISAKUSHO