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Webbing take-up device

A technology for a coiling device and seat belt, which is applied in the direction of seat belts, coiled strips, belt tensioners, etc. in the car, and can solve problems such as deformation of moving parts

Inactive Publication Date: 2015-08-19
KK TOKAI RIKA DENKI SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In such a structure, the moving member is inserted from one end of the cylinder and arranged at a predetermined position inside the cylinder. However, if the moving member passes through the bent portion or curved portion of the cylinder during its movement, the moving member is deformed.

Method used

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  • Webbing take-up device
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Examples

Experimental program
Comparison scheme
Effect test

no. 2 approach

[0075] like Image 6 As shown, in the seat belt take-up device 70, one of the base end and the front end of the piston 58 ( Image 6 The center is the front end portion) protrudingly formed with a conical or truncated conical convex portion 72 . In addition, on the other side of the base end and the front end of the piston 58 ( Image 6 The base end portion in the middle) is formed with a concave portion 74 , and the convex portion 72 of the piston 58 can enter the concave portion 74 of the adjacent piston 58 . According to this configuration, when the rotary teeth 62 enter between the adjacent pistons 58, it is possible to prevent or suppress the discontinuity of the pistons 58 .

no. 3 approach

[0077] like Figure 7 As shown, in the seat belt take-up device 80 of the third embodiment, the convex portion 72 and the concave portion 74 of the piston 58 are formed in a hemispherical shape, and the convex portion 72 of the piston 58 can enter the concave portion 74 of the adjacent piston 58 . Also in such a configuration, the same effect as that of the second embodiment described above can be obtained.

no. 4 approach

[0079] like Figure 8 As shown, in the seat belt take-up device 90 of the fourth embodiment, the substantially cylindrical piston 58 is disposed on the curved portion 50 of the cylindrical body 44 . The length in the central axis direction of the piston 58 disposed in the curved portion 50 is set to be sufficiently shorter than the length in the central axis direction of the curved portion 50 so that a plurality of pistons 58 can be disposed in the curved portion 50 . Thus, if the length of the piston 58 in the central axis direction is sufficiently shorter than the length of the curved portion 50 in the central axis direction, the deformation of the piston 58 in the curved portion 50 is small, or the piston 58 is not deformed in the curved portion 50 . Therefore, the piston 58 can be easily arranged in the cylindrical body 44 having the curved portion 50 .

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PUM

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Abstract

In this webbing take-up device (10), the total length of each of pistons (58C, 58D) is set shorter than the distance between bent portions (50A, 50B). The total length of a piston (58E) is set shorter than the shorter of the distance between the bent portions (50A, 50B) and the distance between bent portions (50B, 50C). The pistons (58C-58E) are prevented from extending to the bent portion (50A) and to the bent portion (50B) and from extending to the bent portion (50B) and to the bent portion (50C). Consequently, it becomes possible to cause each of the pistons (58C-58E) to easily reach the initial disposition location in a cylinder.

Description

technical field [0001] The present invention relates to a seat belt winding device provided with a pretensioner for forcibly winding a seat belt around a spool. Background technique [0002] In seat belt take-up devices equipped with pretensioners, moving parts such as pistons and force transmission units may be made of deformable materials. The part can also be deformed following the bending of the cylinder or the bending part (as an example, refer to the specification of German Patent Application Publication No. 102006031359). [0003] In such a structure, the moving member is inserted from one end of the cylinder and arranged at a predetermined position inside the cylinder. However, if the moving member passes through the bent or curved portion of the cylinder during its movement, the moving member deforms. Such deformation of the moving member acts as a resistance to movement of the moving member. Contents of the invention [0004] The present invention takes the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R22/46
CPCB60R2022/4642B60R22/4628B60R2022/468B65H18/14
Inventor 大久保真一森信二
Owner KK TOKAI RIKA DENKI SEISAKUSHO