Webbing take-up device

Abstract

To provide a webbing take-up device whose structure can be simplified.SOLUTION: In a webbing take-up device 10, when a lock base 32 is restricted from rotating in a pull-out direction, a wire 36 is bent and deformed at a first deformation part 22A, a second deformation part 22B and a third deformation part 22C, which allows a spool 16 to rotate in the pull-out direction with respect to the lock base 32 and allows a webbing 24 to be pulled out from the spool 16. The first deformation part 22A, the second deformation part 22B and the third deformation part 22C are provided on the spool 16, which enables the device to be structured simply.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a webbing take-up device in which, when rotation of a restricting body in the unwinding direction is restricted, a long material is deformed, thereby allowing rotation of a spool in the unwinding direction. [Background technology]

[0002] In the webbing take-up device described in Patent Document 1 below, an FL box is fixed to a spool, and a wire is hung between the FL box and the lock base. When rotation of the lock base in the pull-out direction is restricted, the wire is deformed at multiple FL pins, allowing rotation of the spool in the pull-out direction, thereby allowing the webbing to be pulled out from the spool.

[0003] Here, in this webbing take-up device, a plurality of FL pins are provided in an FL box that is separate from the spool. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-70136 Summary of the Invention [Problem to be solved by the invention]

[0005] In consideration of the above, an object of the present invention is to provide a webbing take-up device that can be simply configured. [Means for solving the problem]

[0006] A webbing take-up device of a first aspect of the present invention includes a spool around which a webbing to be worn by an occupant is wound and around which the webbing is pulled out and rotated in the pull-out direction, a plurality of deformation portions provided on the spool, a regulating body that can regulate rotation in the pull-out direction, and a long material that is stretched between the spool and the regulating body and that is deformed at the plurality of deformation portions when rotation of the regulating body in the pull-out direction is regulated, thereby allowing rotation of the spool in the pull-out direction and allowing the webbing to be pulled out from the spool.

[0007] A webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the long material is arranged side by side on one side and the other side of the deformation portion.

[0008] A webbing take-up device of a third aspect of the present invention is the webbing take-up device of the first or second aspect of the present invention, wherein the long material is exposed to the outside in the radial direction of the spool.

[0009] A webbing take-up device according to a fourth aspect of the present invention is the webbing take-up device according to the third aspect of the present invention, further comprising a covering member that covers an exposed portion of the long material radially outward of the spool. [Effects of the Invention]

[0010] In the webbing take-up device of the first aspect of the present invention, a webbing to be worn by an occupant is wound around a spool, and the webbing is pulled out from the spool and the spool is rotated in the pull-out direction. Also, a long material is stretched between the spool and a regulating body, and when rotation of the regulating body in the pull-out direction is restricted, the long material is deformed at the multiple deformation portions, allowing rotation of the spool in the pull-out direction, thereby allowing the webbing to be pulled out from the spool.

[0011] Here, the plurality of deformation portions are provided on the spool, which eliminates the need for a separate member from the spool on which the plurality of deformation portions are provided, thereby simplifying the configuration.

[0012] In the webbing take-up device of the second aspect of the present invention, the long material is arranged side by side on one side and the other side of the deformation section, which makes it possible to reduce the area in which the long material is arranged.

[0013] In the webbing take-up device of the third aspect of the present invention, the long material is exposed to the outside in the radial direction of the spool, so that the long material can be placed on the spool from the outside in the radial direction.

[0014] In the webbing take-up device of the fourth aspect of the present invention, the covering member covers the exposed portion of the long material on the outer side in the radial direction of the spool, which allows the long material to deform appropriately at the deformation portion. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing a webbing take-up device according to a first embodiment of the present invention, as viewed from the rear. [Figure 2] 1 is a rear view showing the main parts of a webbing take-up device according to a first embodiment of the present invention, as viewed from the rear. [Figure 3] 3 is a cross-sectional view (cross-sectional view taken along line 3-3 in FIG. 2) showing the main part of the webbing take-up device according to the first embodiment of the present invention as viewed from the right side. [Figure 4] 4 is a graph showing the relationship between the stroke or time (horizontal axis) of webbing withdrawal and the force limiter load (vertical axis) when a vehicle crash occurs in the webbing take-up device according to the first embodiment of the present invention. [Figure 5] FIG. 10 is a rear view showing the main parts of a webbing take-up device according to a second embodiment of the present invention, as viewed from the rear. [Figure 6] FIG. 10 is a rear view showing the main part of a webbing take-up device according to a modified example of the first embodiment of the present invention, as viewed from the rear. DETAILED DESCRIPTION OF THE INVENTION

[0016] [First embodiment] 1 shows a cross-sectional view of a webbing take-up device 10 according to a first embodiment of the present invention as seen from the rear. In the drawing, the right side of the webbing take-up device 10 is indicated by an arrow RH, and the upper side of the webbing take-up device 10 is indicated by an arrow UP.

[0017] The webbing take-up device 10 according to this embodiment is installed in a vehicle, and the front, right and upper sides of the webbing take-up device 10 are oriented, for example, outward in the vehicle width direction, rearward and upward of the vehicle, respectively.

[0018] 1, the webbing retractor 10 is provided with a frame 12 having a U-shaped cross section as a support body, and the frame 12 is provided with a rear back plate (not shown), a left leg plate 12A, and a right leg plate 12B. The frame 12 is fixed to the vehicle body at the back plate, thereby installing the webbing retractor 10 on the vehicle.

[0019] A box-shaped cover plate 14 serving as a restricting member is fixed to the left side of the frame 12 (leg plate 12A), and the interior of the cover plate 14 is open to the right and closed from the right side by the leg plate 12A. A ratchet hole 14A is formed through the left wall of the cover plate 14, and ratchet teeth 14B serving as a restricting portion are formed around the entire periphery of the circumferential surface of the ratchet hole 14A.

[0020] An approximately cylindrical spool 16 (see Figures 2 and 3) is rotatably supported between leg plates 12A and 12B of frame 12, and the left and right ends of spool 16 are passed through leg plates 12A and 12B, respectively.

[0021] A guide groove 18, which is annular in front view, is coaxially formed on the left surface of the spool 16. The guide groove 18 is open to the left and has a generally rectangular cross section. A first insertion hole 20A is formed in the peripheral wall of the spool 16, and the first insertion hole 20A extends rightward (in the axial direction of the spool 16) from the guide groove 18. A second insertion hole 20B is formed in the peripheral wall of the spool 16, and the second insertion hole 20B extends in the withdrawal direction from the tip (right end) of the first insertion hole 20A. A third insertion hole 20C is formed in the peripheral wall of the spool 16, and the third insertion hole 20C extends leftward from the tip (pull-out direction end) of the second insertion hole 20B. The second and third insertion holes 20B and 20C, except for the base end (left end) of the first insertion hole 20A, are open radially outward from the spool 16.

[0022] The spool 16 is provided with a first deformation portion 22A as a deformation portion at the corner between the guide groove 18 and the first insertion hole 20A on the winding direction side, and the left corner of the first deformation portion 22A on the pulling direction side is curved in the winding direction as it extends to the left. The spool 16 is provided with a second deformation portion 22B as a deformation portion at the corner between the first insertion hole 20A and the second insertion hole 20B, and the right corner of the second deformation portion 22B on the winding direction side is inclined in the left direction as it extends to the winding direction. The spool 16 is provided with a third deformation portion 22C as a deformation portion at the corner between the second insertion hole 20B and the third insertion hole 20C, and the right corner of the third deformation portion 22C on the pulling direction side is inclined in the winding direction as it extends to the right.

[0023] A long strip-shaped webbing 24 is wound around the spool 16 from the base end side in the longitudinal direction, and when the spool 16 is rotated in the winding direction (the direction of arrow A in Figure 1, etc.), the webbing 24 is wound onto the spool 16, and when the webbing 24 is pulled out from the spool 16, the spool 16 is rotated in the unwinding direction (the direction of arrow B in Figure 1, etc.). When the webbing 24 is pulled out from the spool 16, the webbing 24 is applied to an occupant seated in a vehicle seat.

[0024] A metallic, generally cylindrical torsion shaft 26 serving as a first energy absorbing member is coaxially disposed within the spool 16. The right end of the torsion shaft 26 is connected to the spool 16 so as to be rotatable therewith, thereby allowing the torsion shaft 26 to rotate integrally therewith. The right end of the torsion shaft 26 is engaged with the spool 16 from the right side, thereby restricting leftward movement of the torsion shaft 26, and the left end of the torsion shaft 26 is disposed within the left end of the spool 16. A generally cylindrical screw hole 26A is formed coaxially at the left end of the torsion shaft 26, and the screw hole 26A is open to the left side.

[0025] A biasing mechanism 28 is provided on the right side of the frame 12 (leg plate 12B), and a power spring (not shown) serving as a biasing member is provided within the biasing mechanism 28. The power spring is connected to the right end of the spool 16, and biases the spool 16 in the winding direction.

[0026] A pinion 30 having a generally annular plate shape and serving as a connecting member constituting the regulating body is coaxially provided on the left side of the spool 16, and the left end of the torsion shaft 26 is integrally rotatably coupled within the pinion 30. A lock base 32 having a generally annular plate shape and serving as a regulated member constituting the regulating body is coaxially provided on the left side of the pinion 30, and the lock base 32 is integrally rotatably coupled to the pinion 30, allowing the spool 16, torsion shaft 26, pinion 30, and lock base 32 to rotate integrally.

[0027] A substantially cylindrical screw shaft 34 is coaxially fitted into the pinion 30 and the lock base 32, and the left portion of the screw shaft 34 is engaged with the lock base 32 from the left side. The right end of the screw shaft 34 is threadedly engaged with the circumferential surface of the threaded hole 26A of the torsion shaft 26, whereby the pinion 30 and the lock base 32 are sandwiched between the left portion of the screw shaft 34 and the spool 16. The lock base 32 is coaxially inserted through the ratchet hole 14A of the cover plate 14, and a lock plate 32A (see FIG. 2) serving as a regulated portion is rotatably supported by the lock base 32.

[0028] A sensor mechanism (not shown) is provided on the left side of the cover plate 14, and the sensor mechanism is connected to the lock plate 32A of the lock base 32. In the event of a vehicle collision (a vehicle emergency such as sudden deceleration of the vehicle or sudden withdrawal of the webbing 24 from the spool 16), the sensor mechanism is activated and the lock plate 32A is rotated radially outward of the lock base 32, whereby the lock plate 32A meshes with the ratchet teeth 14B of the cover plate 14 (ratchet hole 14A), restricting (locking) rotation of the lock base 32 in the withdrawal direction. This restricts rotation of the pinion 30 in the withdrawal direction, and the torsion shaft 26 restricts rotation of the spool 16 in the withdrawal direction.

[0029] A long, rod-shaped metal wire 36 (see FIGS. 2 and 3) is provided on the spool 16 as a second energy-absorbing member (long member), and the wire 36 has a circular cross section. A base end 36A of the wire 36 has an expanded diameter, and the vicinity of the base end 36A of the wire 36 is passed through the pinion 30, and the base end 36A of the wire 36 is engaged with the pinion 30 from the left side. The portion of the wire 36 between the vicinity of the base end 36A and the placement portion 36B is formed on the tip side. The portion of the wire 36 between the vicinity of the base end 36A and the placement portion 36B is bent, so that the placement portion 36B is placed in the guide groove 18 of the spool 16 and extends from the base end 36A side in the withdrawal direction.

[0030] The portion of the wire 36 distal from the placement portion 36B is a first extending portion 36C, and the end of the first extending portion 36C on the placement portion 36B side is a first bent portion 36D, so that the first extending portion 36C is inserted into the first insertion hole 20A of the spool 16 and extends to the right. The portion of the wire 36 distal from the first extending portion 36C is a second extending portion 36E, and the end of the second extending portion 36E on the first extending portion 36C side is a second bent portion 36F, so that the second extending portion 36E is inserted into the second insertion hole 20B of the spool 16 and extends in the pull-out direction. The tip side of the wire 36 from the second extension portion 36E is the third extension portion 36G, and the end of the third extension portion 36G on the second extension portion 36E side is made into the third bent portion 36H, so that the third extension portion 36G is inserted into the third insertion hole 20C of the spool 16 and extends to the left.

[0031] The portions of the first extension portion 36C other than the base end (left end), the second extension portion 36E, and the third extension portion 36G are exposed radially outside the spool 16, and the portions of the first extension portion 36C other than the base end, the second extension portion 36E, and the third extension portion 36G are covered from the radial outside of the spool 16 by the webbing 24 wound around the spool 16.

[0032] The wire 36 is hung between the pinion 30 and the spool 16 (first insertion hole 20A, second insertion hole 20B and third insertion hole 20C) from the base end 36A to the third extension portion 36G, and when the rotation of the pinion 30 in the pull-out direction is restricted, the wire 36 limits the rotation of the spool 16 in the pull-out direction.

[0033] Next, the operation of this embodiment will be described.

[0034] In the webbing take-up device 10 configured as described above, the webbing 24 is pulled out from the spool 16 and attached to the occupant. Furthermore, the spool 16 is rotated in the retracting direction by the biasing force of the power spring of the biasing mechanism, and the webbing 24 is retracted onto the spool 16, thereby removing slack from the webbing 24 attached to the occupant.

[0035] In the event of a vehicle collision, the sensor mechanism is activated and the lock plate 32A of the lock base 32 meshes with the ratchet teeth 14B of the cover plate 14 (ratchet hole 14A), restricting rotation of the lock base 32 in the pull-out direction and restricting rotation of the pinion 30 in the pull-out direction. As a result, the torsion shaft 26 and the wire 36 restrict rotation of the spool 16 in the pull-out direction, restricting pull-out of the webbing 24 from the spool 16, and the occupant is restrained by the webbing 24.

[0036] When a pulling force from the spool 16 is applied by the occupant to the webbing 24 with the rotation of the lock base 32 and the pinion 30 restricted in the unwinding direction, and a rotational force in the unwinding direction is applied to the spool 16, a torsion force is applied to the torsion shaft 26, and a pulling force from the first insertion hole 20A, the second insertion hole 20B, and the third insertion hole 20C of the spool 16 causes bending forces to be applied to the wire 36 at the first deformation portion 22A, the second deformation portion 22B, and the third deformation portion 22C of the spool 16. The bending forces applied to the wire 36 are a bending force toward the winding direction and a bending force that restores the bending at the first deformation portion 22A, a bending force to the left and a bending force that restores the bending at the second deformation portion 22B, and a bending force toward the winding direction and a bending force that restores the bending at the third deformation portion 22C.

[0037] When the pulling load from the spool 16 from the occupant to the webbing 24 (rotational load in the unwinding direction of the spool 16) is equal to or greater than the total load of the torsional load resistance of the torsion shaft 26 and the bending load resistance of the wire 36, the torsion shaft 26 is torsionally deformed and the wire 36 is bent (squeezed) while being unwound from the first insertion hole 20A, the second insertion hole 20B, and the third insertion hole 20C of the spool 16, thereby allowing rotation of the spool 16 in the unwinding direction relative to the lock base 32 and the pinion 30 and allowing the webbing 24 to be unwound from the spool 16. As a result, the kinetic energy of the occupant is absorbed by the torsional deformation of the torsion shaft 26 and the bending deformation of the wire 36, thereby protecting the occupant.

[0038] As shown in FIG. 4, from the time when the webbing 24 begins to be allowed to be pulled out from the spool 16 until the tip of the wire 36 passes through the third deformation portion 22C of the spool 16, the force limiter load (the load that allows the webbing 24 to be pulled out from the spool 16) is set to the total load of the torsion resistance load FB (basic force limiter load) of the torsion shaft 26, the bending resistance load F1 (first force limiter load) at the first deformation portion 22A of the wire 36, the bending resistance load F2 (second force limiter load) at the second deformation portion 22B of the wire 36, and the bending resistance load F3 (third force limiter load) at the third deformation portion 22C of the wire 36.

[0039] After the tip of the wire 36 passes through the third deformation portion 22C of the spool 16 and before the tip of the wire 36 passes through the second deformation portion 22B of the spool 16, the force limiter load is set to the total load of the torsional load FB of the torsion shaft 26, the bending load F1 at the first deformation portion 22A of the wire 36, and the bending load F2 at the second deformation portion 22B of the wire 36.

[0040] After the tip of the wire 36 passes through the second deformation portion 22B of the spool 16 and before the tip of the wire 36 passes through the first deformation portion 22A of the spool 16, the force limiter load is set to the total load of the torsional load resistance FB of the torsion shaft 26 and the bending load resistance F1 at the first deformation portion 22A of the wire 36.

[0041] After the tip end of the wire 36 passes through the first deformation portion 22A of the spool 16, the force limiter load becomes the torsion load resistance FB of the torsion shaft 26.

[0042] As described above, as the stroke or time allowed for withdrawal of the webbing 24 from the spool 16 becomes longer, the force limiter load is decreased in four stages.

[0043] Here, the first deformation portion 22A, the second deformation portion 22B, and the third deformation portion 22C are provided on the spool 16. Therefore, it is not necessary to provide a separate member from the spool 16 on which the first deformation portion 22A, the second deformation portion 22B, and the third deformation portion 22C are provided, and the configuration of the webbing take-up device 10 can be simplified.

[0044] Furthermore, in the spool 16, the second extending portion 36E and the third extending portion 36G of the wire 36 are arranged side by side on the winding direction side (one side) and the unwinding direction side (the other side) of the second deforming portion 22B and the third deforming portion 22C. This allows the arrangement area of ​​the wire 36 in the spool 16 to be small, and the length of the wire 36 arranged in the spool 16 to be long.

[0045] Furthermore, the portion of the wire 36 other than the base end of the first extending portion 36C, the second extending portion 36E, and the third extending portion 36G are exposed radially outward from the spool 16. Therefore, when the wire 36 is assembled to the spool 16, the first extending portion 36C to the third extending portion 36G of the wire 36 are inserted into the first insertion hole 20A of the spool 16 from the left side without the second bent portion 36F and the third bent portion 36H of the wire 36 being bent, and then the second bent portion 36F and the third bent portion 36H of the wire 36 are bent, and the second extending portion 36E and the third extending portion 36G of the wire 36 are inserted into the second insertion hole 20B and the third insertion hole 20C of the spool 16, respectively. This allows the second extending portion 36E and the third extending portion 36G of the wire 36 to be arranged radially outward from the spool 16.

[0046] Furthermore, the portion of the wire 36 other than the base end of the first extension portion 36C, the second extension portion 36E, and the third extension portion 36G are covered from the radially outer side of the spool 16 by the webbing 24 wound around the spool 16. Therefore, the movement of the portion of the wire 36 other than the base end of the first extension portion 36C, the second extension portion 36E, and the third extension portion 36G toward the radially outer side of the spool 16 can be restricted by the webbing 24, and the wire 36 can be appropriately deformed at the second deformation portion 22B and the third deformation portion 22C.

[0047] [Second embodiment] FIG. 5 shows a rear view of the main parts of a webbing take-up device 50 according to a second embodiment of the present invention, as seen from the rear.

[0048] The webbing take-up device 50 according to this embodiment has substantially the same configuration as the first embodiment, but differs in the following respects.

[0049] As shown in FIG. 5, in the webbing take-up device 50 according to this embodiment, a fourth deformation portion 22D is provided as a deformation portion on the left side of the second insertion hole 20B of the spool 16, instead of the second deformation portion 22B and the third deformation portion 22C, and the deformation surface on the right side of the fourth deformation portion 22D is curved in an arc shape that is convex to the right.

[0050] The second extending portion 36E of the wire 36 is curved in a convex arc shape to the right, and the second extending portion 36E extends along the deformation surface of the fourth deformation portion 22D of the spool 16.

[0051] Incidentally, in the event of a vehicle collision, with the rotation of the lock base 32 and the pinion 30 restricted in the unwinding direction, if a pulling force is applied from the spool 16 by the occupant to the webbing 24 and a rotational force in the unwinding direction is applied to the spool 16, a torsion force is applied to the torsion shaft 26, and a bending force is applied to the wire 36 at the first deformation portion 22A and the fourth deformation portion 22D of the spool 16 due to the pulling force from the first insertion hole 20A, the second insertion hole 20B, and the third insertion hole 20C of the spool 16. The bending force acting on the wire 36 is a bending force toward the winding direction and a bending force that restores the bending at the first deformation portion 22A, and a bending force toward the winding direction and a bending force that restores the bending at the fourth deformation portion 22D.

[0052] From the time when the webbing 24 begins to be allowed to be pulled out from the spool 16 until the tip of the wire 36 passes through the fourth deformation portion 22D of the spool 16, the force limiter load (the load that allows the webbing 24 to be pulled out from the spool 16) is set to the total load of the torsion load resistance (basic force limiter load) of the torsion shaft 26, the bending load resistance (first force limiter load) at the first deformation portion 22A of the wire 36, and the bending load resistance (fourth force limiter load) at the fourth deformation portion 22D of the wire 36.

[0053] After the tip of the wire 36 passes through the fourth deformation portion 22D of the spool 16, but before the tip of the wire 36 passes through the first deformation portion 22A of the spool 16, the force limiter load is set to the total load of the torsional load resistance of the torsion shaft 26 and the bending load resistance at the first deformation portion 22A of the wire 36.

[0054] After the tip of the wire 36 passes through the first deformation portion 22A of the spool 16, the force limiter load becomes the torsion load resistance of the torsion shaft 26.

[0055] As described above, as the stroke or time allowed for withdrawal of the webbing 24 from the spool 16 becomes longer, the force limiter load is reduced in three stages.

[0056] Here, in this embodiment, the second deformation portion 22B and the third deformation portion 22C of the first embodiment are changed to a fourth deformation portion 22D, and the same actions and effects as those of the first embodiment can be achieved.

[0057] (Variation) FIG. 6 shows a rear view of the main part of a webbing take-up device 60 according to a modified example of the first embodiment, as seen from behind.

[0058] As shown in FIG. 6, in the webbing take-up device 60 according to this modified example, the base end portion of the first insertion hole 20A of the spool 16 is curved in a wave shape to form a wave hole 20D, and the portion of the spool 16 adjacent to the wave hole 20D constitutes a first deformation portion 22A.

[0059] The base end portion of the first extending portion 36C of the wire 36 is bent in a wave shape to form a wave portion 36I, and the wave portion 36I is disposed along the wave hole 20D of the spool 16.

[0060] Here, this modified example can also achieve the same functions and effects as the first embodiment.

[0061] Furthermore, when the webbing 24 is allowed to be pulled out from the spool 16 during a vehicle collision, the wire 36 is also bent and deformed at the position of the corrugated hole 20D of the spool 16. Therefore, when the wire 36 is disposed in the corrugated hole 20D, the force limiter load can be increased.

[0062] Moreover, when the webbing 24 is allowed to be pulled out from the spool 16, even after the tip end of the wire 36 has passed through the second deformation portion 22B of the spool 16, the wire 36 is disposed in the corrugated hole 20D of the spool 16, thereby limiting the separation between the spool 16 and the pinion 30. Therefore, even if the torsion shaft 26 is torsionally deformed and extended in the axial direction, the left side of the spool 16 and the right sides of the lock base 32 and pinion 30 can be prevented from tilting upward due to the pulling force of the webbing 24 from the spool 16.

[0063] This modification is applied to the first embodiment, but may also be applied to the second embodiment.

[0064] Furthermore, in the first embodiment, the second embodiment, and the modified examples described above, a covering member such as a metal covering plate 70 (see FIG. 2) may cover the portions of the wire 36 other than the base end of the first extension portion 36C and the radially outer sides of the second extension portion 36E and the third extension portion 36G in the spool 16. In this case, the covering plate 70 is fixed to the spool 16 by the webbing 24 wound around the spool 16. This allows the covering plate 70 to effectively restrict movement of the portions of the wire 36 other than the base end of the first extension portion 36C and the second extension portion 36E and the third extension portion 36G radially outward in the spool 16, and allows the wire 36 to deform appropriately at the second deformation portion 22B and the third deformation portion 22C or the fourth deformation portion 22D (which may include the position of the corrugated hole 20D).

[0065] Furthermore, in the first embodiment, the second embodiment, and the modified examples described above, an assembly hole may be formed in the left end of the spool 16, and the assembly hole may be connected to the guide groove 18 and the first insertion hole 20A of the spool 16 and open to the right. In this case, when the wire 36 is assembled to the spool 16, the first extending portion 36C to the third extending portion 36G of the wire 36 are inserted into the assembly hole from the left side with the second bent portion 36F and the third bent portion 36H or the second extending portion 36E of the wire 36 bent, and the first extending portion 36C to the third extending portion 36G of the wire 36 are inserted into the first insertion hole 20A to the third insertion hole 20C of the spool 16, respectively.

[0066] Furthermore, in the above first embodiment, second embodiment, and modified examples, the position and number of the deforming portions of the spool 16, the position and number of the bent portions of the wire 36, and the thickness, length, and number of the wire 36 may be changed, thereby responding to variations in the magnitude and change of the required force limiter load. [Explanation of symbols]

[0067] 10 webbing take-up device, 16 spool, 22A first deformation portion (deformation portion), 22B second deformation portion (deformation portion), 22C third deformation portion (deformation portion), 22D fourth deformation portion (deformation portion), 24 webbing, 30 pinion (regulating body), 32 lock base (regulating body), 36 wire (long material), 50 webbing take-up device, 60 webbing take-up device, 70 covering plate (covering member)

Claims

1. a spool around which a webbing to be worn by an occupant is wound and which rotates in the unwinding direction to unwind the webbing; a plurality of deformation portions provided on the spool; a restricting body that can restrict rotation in the pull-out direction; a long material that is stretched between the spool and the regulating body, and that is deformed at the plurality of deformation portions when rotation of the regulating body in the unwinding direction is regulated, thereby allowing rotation of the spool in the unwinding direction and allowing the webbing to be unwound from the spool; A webbing take-up device comprising:

2. The webbing take-up device according to claim 1, wherein the elongated material is arranged side by side on one side and the other side of the deformation portion.

3. The webbing take-up device according to claim 1, wherein the elongated material is exposed radially outward from the spool.

4. The webbing take-up device according to claim 3, further comprising a covering member that covers an exposed portion of the elongated material radially outward of the spool.

Images