JP2015199417A - webbing take-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a webbing take-up device capable of increasing strength of a stopper and guide means against tension of webbing.SOLUTION: When webbing is pulled out in a state in which rotation of a lock base 40 is inhibited in an emergency of a vehicle, a spool 18 is rotated relative to the lock base 40, and an energy absorption member is deformed. Since a stopper 76 for limiting the amount of rotation of the spool 18 is engaged with an inner peripheral part of the guide member 66, strength of this engagement part can be increased.

Description

  The present invention relates to a webbing take-up device that can prevent rotation of a spool in a pull-out direction with respect to a lock base by a stopper.

  There is a webbing take-up device in which a female screw formed on a portion on the spool central axis side of a stopper is screwed with a male screw formed on a lock base (see Patent Document 1 below as an example). When the lock mechanism and the force limiter mechanism are operated and the stopper is rotated in the pulling direction together with the spool, the stopper is guided by the male screw of the lock base and moved closer to the lock base. The stopper is brought into contact with the lock base to prevent the approaching movement, thereby preventing the spool from rotating in the pulling-out direction. In such a configuration, when the webbing is pulled while the lock base is prevented from rotating, the female screw of the stopper receives an axial force from the male screw of the lock base. When the screw diameters of the female screw of the stopper and the male screw of the lock base are increased in order to increase the strength of the male screw and the female screw against such an axial force, the stopper is enlarged.

JP-A-11-157416

  An object of the present invention is to obtain a webbing take-up device that can improve the strength of the stopper and guide means against webbing tension without particularly increasing the size of the stopper in consideration of the above facts.

  The webbing take-up device according to claim 1 is provided so as to rotate integrally with the spool that rotates in the pull-out direction when the webbing is pulled out, and the rotation in the pull-out direction is restricted in the event of a vehicle emergency. A lock base, an energy absorbing member that absorbs the rotational force of the spool by being deformed by rotating the spool relative to the lock base in the pull-out direction in an emergency of the vehicle, and toward the moving end by the relative rotation A stopper that prevents the relative rotation at the moving end, and a guide means that engages the stopper from the outside in the radial direction and moves the stopper toward the moving end by the relative rotation; It has.

  In the webbing take-up device according to the first aspect, the guide means is engaged with the stopper from the outside. For this reason, the length from the rotation center of the guide means or the stopper to the engaging portion between the guide means and the stopper can be increased without particularly increasing the size of the stopper. Thereby, when the stopper is moved, the load per unit area acting on the engaging portion between the guide means and the stopper is reduced, and the strength can be improved.

  A webbing take-up device according to a second aspect is the webbing take-up device according to the first aspect, wherein the guide means is a female screw that is screwed into a male screw formed in the stopper.

  In the webbing take-up device according to the second aspect, the guide means is a female screw and is screwed into the male screw formed on the stopper from the outside in the radial direction of the spool rotation. For this reason, the length (screw diameter) to the threaded part of the male screw and female screw of the spool can be increased, and the axial force per unit area applied from the female screw to the male screw when the female screw is rotated relative to the male screw. Can be reduced. Thereby, the strength of the threaded portion against the webbing tension in the lock base rotation prevention state can be improved without increasing the stopper.

  The webbing take-up device according to a third aspect is the webbing take-up device according to the first or second aspect, wherein the guide means is formed and is configured separately from one of the spool and the lock base. And a guide member which is provided on the one side so as not to be relatively rotatable and has a mechanical strength higher than that of the one side.

  In the webbing take-up device according to a third aspect of the present invention, guide means is formed on the guide member, and the guide member is provided on one of the spool and the lock base so as not to be relatively rotatable. Here, the mechanical strength of the guide member is set higher than the one. For this reason, even if the one mechanical strength is not set to be particularly high, the mechanical strength against the load received by the guide member from the stopper can be ensured.

  The webbing take-up device according to a fourth aspect is the webbing take-up device according to the third aspect, wherein a rotational force is transmitted between the guide member and one of the spool and the lock base. A plurality of rotational force transmitting portions that prevent relative rotation with respect to the one side are provided.

  According to a fourth aspect of the present invention, there is provided a webbing take-up device including a plurality of rotational force transmission units. For this reason, when the rotational force is transmitted between the guide member and one of the spool and the lock base, the rotational force is distributed to the plurality of rotational force transmission units. Thereby, the stress concentration when the rotational force is transmitted between the guide member and one of the spool and the lock base can be suppressed. It should be noted that the term “suppression” is used not only to suppress but also to prevent, throughout this specification.

  The webbing take-up device according to claim 5 is the webbing take-up device according to any one of claims 1 to 4, wherein the stopper is a disc-shaped member that engages the guide means with an outer peripheral portion. Is formed.

  In the webbing take-up device according to the fifth aspect, the guide means is engaged with the outer peripheral portion of the disc-shaped stopper, and the stopper receives a load on the center side from the guide means. For this reason, the load per unit area which acts on the engaging part of a guide means and a stopper can be reduced compared with the structure which receives the load of the stopper radial direction outer side from a guide means in the center side of a stopper. In addition, disk shape is used throughout this specification as the meaning including the case where a hole is formed inside and it becomes cyclic | annular.

  As described above, in the webbing take-up device according to the present invention, the strength of the stopper and the guide means against the webbing tension can be improved without particularly increasing the size of the stopper.

It is a disassembled perspective view of the webbing take-up device according to the present embodiment. It is an expansion exploded perspective view of a spool, a lock base, a guide member, and a stopper. 2, (A) shows the initial state of the stopper, and (B) shows the state in which the stopper has been moved in the spool axis direction.

  Next, an embodiment of the present invention will be described with reference to FIGS. In each figure, the arrow FR indicates the front side of the webbing take-up device 10, the arrow LH indicates the left side, and the arrow UP indicates the upper side.

<Configuration of the present embodiment>
As shown in FIG. 1, a webbing retractor 10 according to the present embodiment includes a frame 12 that is fixed to a skeleton member or a reinforcing member of a vehicle on the rear side of the rear seat of the vehicle. The frame 12 includes wall portions 14 and 16 that face in the left-right direction, and a spool 18 is provided between the wall portion 14 and the wall portion 16. The axial direction of the spool 18 is along the left-right direction, and a through hole 20 is formed in the spool 18 along the central axis. The spool 18 is engaged with the proximal end side in the longitudinal direction of the webbing 22, and the webbing 22 is wound around the outer periphery of the spool 18 in layers by rotating the spool 18 around the axis in the winding direction. A rotating member 24 is provided on the left side of the spool 18. The rotating member 24 is fitted into the through hole 20 from the left side of the spool 18, thereby preventing relative rotation of the rotating member 24 with respect to the spool 18.

  On the other hand, on the left side of the frame 12, a pretensioner 26 that operates in the event of a vehicle emergency such as a vehicle collision is provided. When the pretensioner 26 is operated, the rotating member 24 is rotated in the winding direction. As a result, the spool 18 is rotated in the winding direction, and the webbing 22 is wound on the spool 18. A spring housing 28 is provided on the left side of the pretensioner 26, and the rotating member 24 is rotatably supported by the spring housing 28. A spiral spring (not shown) is provided in the spring housing 28. The spiral spring is engaged with the rotating member 24, and thereby the spool 18 is urged in the winding direction.

  On the other hand, a torsion shaft 30 as an energy absorbing member is provided inside the through hole 20 of the spool 18. The torsion shaft 30 includes a shaft portion 32, and a connecting portion 34 is formed on the left side of the shaft portion 32. A connecting portion 36 is formed on the right side of the shaft portion 32, and a support shaft 38 is formed on the right side of the connecting portion 36 so as to protrude coaxially with the spool 18. The connecting portion 34 on the left side of the torsion shaft 30 is engaged inside the through hole 20 of the spool 18, thereby preventing relative rotation of the torsion shaft 30 with respect to the spool 18.

  A lock base 40 is provided on the right side of the spool 18. The left end surface of the lock base 40 is in contact with the right end surface of the spool 18, and the lock base 40 is engaged with the connecting portion 36 on the right side of the torsion shaft 30 so that the relative rotation with respect to the torsion shaft 30 is performed. It is blocked. As a result, the lock base 40 can rotate integrally with the spool 18. However, when the rotational force exceeding the mechanical strength of the torsion shaft 30 acts on the spool 18 in a state where the rotation of the lock base 40 is blocked, the spool 18 is rotated while the shaft portion 32 of the torsion shaft 30 is twisted and deformed. .

  Further, a lock pawl 42 is rotatably supported on the lock base 40. The lock pawl 42 is disposed inside a ratchet hole 44 formed in the right wall 16 of the frame 12, and meshes with the ratchet teeth of the ratchet hole 44 by rotating. As a result, the lock base 40 is prevented from rotating in the pull-out direction opposite to the winding direction. A sensor mechanism 46 is provided on the right side of the lock base 40. The sensor mechanism 46 includes a V gear 48. The V gear 48 has ratchet teeth formed on the outer periphery thereof, and is rotatably supported on the support shaft 38 of the torsion shaft 30. Further, an engagement shaft 50 formed on the lock pawl 42 is engaged with the V gear 48, and the lock pawl 42 rotates when the lock base 40 is rotated relative to the V gear 48 in the pull-out direction. Then, it meshes with the ratchet teeth of the ratchet hole 44.

  Further, a spring (not shown) is provided between the lock base 40 and the V gear 48. When the spring is rotated in the pulling direction together with the lock base 40, the V gear 48 is pressed in the pulling direction by the spring. . As a result, the V gear 48 follows the lock base 40 and rotates in the pull-out direction. However, the spring is elastically deformed when the lock base 40 rotates in the pulling direction, so that the lock base 40 can rotate relative to the V gear 48 in the pulling direction.

  On the other hand, the sensor mechanism 46 includes a first cover 52, and the V gear 48 is accommodated in the first cover 52. Inside the first cover 52, internal ratchet teeth are formed coaxially with the support shaft 38 of the torsion shaft 30. Corresponding to the ratchet teeth, a W pawl 54 constituting a WSIR mechanism is supported on the V gear 48 so as to be swingable. The WSIR mechanism is operated when the spool 18 is rotated in the pull-out direction at a rotational acceleration of a predetermined magnitude or more in a vehicle emergency such as a vehicle collision. When the V gear 48 together with the spool 18 is rotated in the pull-out direction with a rotational acceleration of a predetermined magnitude or more, the W pawl 54 is swung and engaged with the ratchet teeth of the first cover 52. As a result, rotation of the V gear 48 in the pull-out direction is prevented.

  Further, a second cover 56 is provided on the right side of the first cover 52, and the first cover 52 is accommodated inside the second cover 56. The front end side of the support shaft 38 of the torsion shaft 30 passes through the first cover 52 and is rotatably supported by the second cover 56. The second cover 56 is provided with an acceleration sensor 58 constituting a VSIR mechanism, and the VSIR mechanism is operated in a vehicle rapid deceleration state such as when a vehicle collides. The acceleration sensor 58 includes a hard ball 60 that rolls with inertia in the event of a vehicle collision. When the hard ball 60 rolls, the sensor pawl 62 of the acceleration sensor 58 is pushed up by the hard ball 60 and meshes with the ratchet teeth of the V gear 48. As a result, rotation of the V gear 48 in the pull-out direction is prevented.

  On the other hand, as shown in FIG. 2, one end portion (right end portion) of the through hole 20 formed in the spool 18 is expanded in diameter to form a fitting portion 64, and the fitting portion 64 includes a guide member 66. Is inserted. The guide member 66 has a cylindrical shape made of a metal material having a mechanical strength higher than that of the spool 18, in particular, a strength against a shearing load, and a bottom portion 68 is formed at the other end (left end portion) of the guide member 66 in the axial direction of the spool 18. Has been. A circular hole 70 is formed on the radial center side of the bottom 68, and the torsion shaft 30 passes through the circular hole 70.

  A plurality of convex portions 72 as a rotational force transmitting portion protrude from the outer peripheral portion of the guide member 66. Corresponding to these convex portions 72, the fitting portion 64 includes a plurality of concave portions 74 as rotational force transmitting portions. When the guide member 66 is inserted into the fitting portion 64, each convex portion 72 becomes each concave portion. 74, so that the relative rotation of the guide member 66 with respect to the spool 18 is prevented. A stopper 76 is provided inside the guide member 66. The stopper 76 is formed in a disc shape, and a male screw 78 is formed on the outer peripheral portion. On the other hand, a female thread 80 as a guide means is formed on the inner side surface of the guide member 66, and the male thread 78 of the stopper 76 from the outer side in the rotational radius when the guide member 66 is rotated in the pull-out direction together with the spool 18. Are screwed together. When the guide member 66 is rotated relative to the stopper 76 in the pull-out direction, the stopper 76 is moved to the other side (left side) in the spool 18 axial direction with respect to the guide member 66.

  On the other hand, on the surface of the lock base 40 on the spool 18 side (left side), a cylindrical portion 82 as rotation limiting means is formed coaxially with the lock base 40. In the assembled state of the webbing take-up device 10, the cylindrical portion 82 is disposed coaxially with the spool 18 inside the fitting portion 64. The inner peripheral shape of the cylindrical portion 82 is the same shape as the outer peripheral shape of the connecting portion 36 on the right side of the torsion shaft 30 (strictly, a similar shape slightly larger than the outer peripheral shape of the connecting portion 36). The tube portion 82 is inserted. Thereby, the rotation of the lock base 40 relative to the torsion shaft 30 is prevented.

  Further, the outer peripheral shape of the cylindrical portion 82 is a non-circular shape in which a plurality of convex portions 84 are intermittently formed in the circumferential direction. In the stopper 76, a hole portion 86 corresponding to the outer peripheral shape of the cylindrical portion 82 is formed coaxially with the cylindrical portion 82. The inner peripheral shape of the hole portion 86 is the same shape as the outer peripheral shape of the cylindrical portion 82 (strictly, a similar shape slightly smaller than the outer peripheral shape of the cylindrical portion 82), and the cylindrical portion 82 passes through the hole portion 86. doing. For this reason, relative rotation of the stopper 76 with respect to the lock base 40 is prevented. As shown in FIG. 3A, the stopper 76 is disposed on the proximal end side (the lock base 40 side) of the cylindrical portion 82 in the initial state, and in this state, the male screw 78 of the stopper 76 is attached to the guide member 66. The internal thread 80 is screwed.

<Operation and effect of the present embodiment>
Next, the operation and effect of the present embodiment will be described.

  In the webbing take-up device 10, in the event of a vehicle emergency such as a vehicle collision, the webbing 22 attached to the occupant's body is pulled, and the lock base 40 together with the spool 18 moves in the pull-out direction with a rotational acceleration greater than a predetermined size. When rotated, the WSIR mechanism of the sensor mechanism 46 is activated. Further, the VSIR mechanism of the sensor mechanism 46 is operated when the vehicle is rapidly decelerated due to a vehicle collision. As described above, the WS gear mechanism and the VSIR mechanism are actuated to prevent the V gear 48 from rotating in the pull-out direction.

  In this state, when the lock base 40 is rotated in the pull-out direction together with the spool 18, and the lock base 40 is rotated relative to the V gear 48 in the pull-out direction, the lock pawl 42 provided on the lock base 40 is moved. It is rotated. Accordingly, when the teeth of the lock pawl 42 are engaged with the inner teeth of the ratchet hole 44 of the right wall portion 16, the lock base 40 is prevented from rotating in the pull-out direction, and the spool 18 is rotated in the pull-out direction. Is blocked. As a result, the webbing 22 is prevented from being pulled out from the spool 18.

  In this state, when the rotational force in the pull-out direction of the spool 18 exceeds the mechanical strength of the shaft portion 32 of the torsion shaft 30, the spool 18 is rotated in the pull-out direction while the shaft portion 32 is twisted. The webbing 22 is pulled out of the spool 18 by the amount of rotation of the spool 18, and part of the energy of the rotational force of the spool 18 is subjected to torsional deformation of the torsion shaft 30 and absorbed.

  On the other hand, when the spool 18 is rotated in the pull-out direction while the lock base 40 is prevented from rotating, the guide member 66 is rotated relative to the stopper 76 in the pull-out direction. The stopper 76 is prevented from rotating relative to the lock base 40 by the cylindrical portion 82, and the female screw 80 of the stopper 76 is screwed to the male screw 78 of the guide member 66. Therefore, when the guide member 66 is rotated in the pull-out direction together with the spool 18, the stopper 76 is moved to the bottom 68 side (left side) of the guide member 66 in the axial direction of the spool 18.

  When the spool 18 is rotated a predetermined number of times in the pull-out direction with respect to the lock base 40, the stopper 76 comes into contact with the bottom 68 of the guide member 66 as shown in FIG. The movement to the bottom 68 side is reached and the stopper 76 is prevented from moving to the bottom 68 side. By preventing the stopper 76 from moving toward the bottom 68, the guide member 66 is prevented from rotating in the pull-out direction. Since the guide member 66 cannot rotate relative to the spool 18, this prevents the spool 18 from rotating in the pull-out direction.

  Here, in the present embodiment, the male screw 78 is formed on the outer peripheral portion of the stopper 76, and the female screw 80 is formed on the inner surface of the guide member 66. For this reason, the screw diameters of the male screw 78 and the female screw 80 can be increased without increasing the size of the stopper 76 as compared with a configuration in which the female screw is formed on the inner side surface of the stopper and the male screw is provided on the center side in the spool radial direction of the stopper. . As a result, the contact area between the male screw 78 and the female screw 80 can be increased, and the axial force per unit area received by the male screw 78 of the stopper 76 from the female screw 80 of the guide member 66 can be reduced.

  More specifically, when a rotational force in the pull-out direction acts on the spool 18 in a state in which the stopper 76 is prevented from moving toward the bottom 68, each screw thread of the male screw 78 of the stopper 76 and the female screw 80 of the guide member 66 is axially applied. The shear load is applied. Here, in the present embodiment, since the contact area between the male screw 78 and the female screw 80 can be increased, the shear load per unit area applied to each thread of the male screw 78 and the female screw 80 can be reduced. Thereby, the strength of the male screw 78 and the female screw 80 against the tension of the webbing 22 when the lock base 40 is prevented from rotating can be improved.

  Further, the guide member 66 is configured separately from the spool 18, and the mechanical strength of the guide member 66 against the shear load is higher than that of the spool 18. This also suppresses deformation of the internal thread 80 of the guide member 66 when a rotational force in the pulling direction acts on the spool 18 in a state where the stopper 76 is prevented from moving toward the bottom 68, and the stopper 76 smoothly moves in the axial direction of the spool 18. Can move to.

  Further, when the spool 18 is rotated, the convex portion 72 of the guide member 66 is pressed in the rotational direction by the inner surface of the concave portion 74, whereby the rotation is transmitted from the spool 18 to the guide member 66. Here, since a plurality of convex portions 72 are formed on the guide member 66 and a plurality of concave portions 74 are formed on the fitting portions 64 of the spool 18, the rotational force of the spool 18 is distributed to the convex portions 72 and the concave portions 74. . As a result, even if a rotation force in the pulling direction is applied to the spool 18 while the guide member 66 is prevented from rotating, the spool 18 can be effectively rotated without a load being concentrated on one convex portion 72 or one concave portion 74. Can be prevented.

  Further, when a rotational force in the pulling direction is applied to the spool 18 in a state where the stopper 76 is in contact with the bottom 68 of the guide member 66, the axial force between the female screw 80 of the guide member 66 and the male screw 78 of the stopper 76 is increased. Due to the component force, the stopper 76 tends to deform toward the radial center. Here, since the stopper 76 is formed in a disk shape, such deformation can be effectively suppressed, and the screwing between the female screw 80 and the male screw 78 can be maintained.

  Moreover, the cylindrical portion 82 of the lock base 40 is passed through the hole portion 86 of the stopper 76. For this reason, when the stopper 76 is to be deformed toward the center in the radial direction, the stopper 76 is supported by the cylindrical portion 82 from the inside of the hole 86. Also by this, the deformation of the stopper 76 can be effectively suppressed, and the screw engagement between the female screw 80 and the male screw 78 can be maintained.

  In the present embodiment, the guide member 66 as the guide means is provided on the spool 18, and the cylindrical portion 82 as the rotation prevention means is provided on the lock base 40. However, as long as the guide means is engaged with the stopper from the outside, the guide means may be provided on the lock base, and the rotation prevention means may be provided on the spool.

  Further, in the present embodiment, the stopper 76 is in contact with the bottom 68 of the guide member 66 serving as the guide means, so that the movement of the stopper 76 in the axial direction of the spool 18 is prevented. However, the stopper may be configured to be prevented from moving in the spool axis direction by contacting the stopper with a part of the spool inside the through hole of the spool, and the stopper may be prevented from moving in the spool axis direction. The configuration for this is not particularly limited.

  In particular, a configuration may be adopted in which a flange is extended to the radially outer side of the cylindrical portion 82 at the distal end of the cylindrical portion 82 and the stopper 76 is brought into contact with the flange to prevent movement in the axial direction of the spool 18. In such a configuration, the separation of the lock base 40 from the spool 18 can be suppressed by pressing the flange against the stopper 76.

  Further, in the present embodiment, the cylindrical portion 82 is formed on the end surface of the lock base 40 on the spool 18 side, and the stopper 76 is disposed on the proximal end side of the cylindrical portion 82. However, for example, a configuration may be adopted in which a concave housing portion opened on the spool-side end surface of the lock base is formed in the lock base, and a stopper is disposed in the housing portion. With such a configuration, the movement stroke of the stopper inside the spool can be shortened. As a result, the axial dimension of the spool can be shortened.

  Further, in the present embodiment, the guide member 66 having the female screw 80 as the guide means is formed separately from the spool 18, but one end portion of the through hole of the spool is enlarged to be formed on the inner surface thereof. You may form the internal thread as a guide means which can be screwed together with the external thread of a stopper.

  In the present embodiment, the mechanical strength of the guide member 66 against the shear load is set higher than that of the spool 18. However, the mechanical strength of the guide member set higher than the spool is not limited to the mechanical strength against the shear load, and may be a load other than the shear load such as a compression load and a bending load. That is, the mechanical strength of the guide member against the load applied from the stopper to the guide member when the pulling direction rotational force is applied to the spool with the stopper reaching the moving end is set higher than that of the spool. That's fine.

  Further, in the present embodiment, the female screw 80 formed on the guide member 66 is used as the guide means. However, the configuration of the guide means is not limited to the female screw. For example, a spiral cam formed in the guide member and having an axial direction along the spool axial direction is used as the guide means. When the spool rotates in the pull-out direction with respect to the lock base, it is formed on the radially outer surface of the stopper. The engaging portion such as the protrusion may be guided by the cam and moved to the moving end side of the stopper. As described above, the guide means may be configured to be engaged with the stopper from the outside and to move the stopper by the relative rotation of the guide means with respect to the stopper by the rotation of the spool in the pull-out direction with respect to the lock base.

  In the present embodiment, when the guide member 66 rotates relative to the stopper 76, the stopper 76 moves in the axial direction of the spool 18. However, the movement of the stopper by the relative rotation of the guide member with respect to the stopper is not limited to the movement in the spool axis direction. For example, a sun gear is provided on one of the spool and the lock base, an internal gear as a guide means is provided on the other, and the stopper is a planetary gear. A configuration may be adopted in which the rotation of the spool is prevented when it is rotated around a certain angle and reaches the moving end. Thus, the movement of the stopper by the relative rotation in the pull-out direction with respect to the lock base of the spool may be a movement other than the spool axis direction such as rotation around the spool axis.

  Furthermore, in the present embodiment, the stopper 76 has a disk shape, but the shape of the stopper may be other shapes such as a C shape having both ends in the circumferential direction. That is, as long as the stopper is configured to be engaged with the guide means from the outside, the shape of the stopper itself is not particularly limited, and various shapes can be widely applied.

  In the present embodiment, the convex portion 72 as the rotational force transmitting portion is formed on the guide member 66 and the concave portion 74 as the rotational force transmitting portion is formed on the spool 18. However, the concave portion 74 as the rotational force transmitting portion may be formed in the guide member 66 and the convex portion 72 as the rotational force transmitting portion may be formed in the spool 18.

  Further, in the present embodiment, the present invention is applied to the webbing take-up device 10 provided on the rear side of the rear seat. However, the present invention can be widely applied to a seat to which the webbing take-up device is applied, such as a webbing take-up device for a driver seat or a passenger seat, and the arrangement position of the webbing take-up device.

10 Webbing take-up device 18 Spool 22 Webbing 30 Torsion shaft (energy absorbing member)
40 Lock base 66 Guide member 72 Convex part (rotational force transmission part)
74 Concave part (rotational force transmission part)
76 Stopper 78 Male thread 80 Female thread (guide means)

Claims (5)

A spool that rotates in the pull-out direction when the webbing is pulled out;
A lock base which is provided so as to be rotatable integrally with the spool, and is limited in rotation in the pull-out direction in a vehicle emergency;
An energy absorbing member that is deformed by rotating the spool relative to the lock base in the pull-out direction and absorbs the rotational force of the spool in an emergency of the vehicle;
A stopper that is movable toward the moving end by the relative rotation and that prevents the relative rotation at the moving end;
A guide means for engaging the stopper from the outside in the radial direction and moving the stopper toward the moving end by the relative rotation;
A webbing take-up device comprising:   The webbing take-up device according to claim 1, wherein the guide means is a female screw that is screwed into a male screw formed on the stopper.   The guide means is formed, and includes a guide member that is formed separately from one of the spool and the lock base and is provided on the one so as not to be relatively rotatable, and has a mechanical strength set higher than that of the one. The webbing take-up device according to claim 1 or 2.   4. The webbing winding according to claim 3, further comprising a plurality of rotational force transmitting portions that transmit rotational force between the guide member and one of the spool and the lock base to prevent relative rotation of the guide member with respect to the one. Taking device.   The webbing take-up device according to any one of claims 1 to 4, wherein the stopper is formed in a disc shape in which the guide means engages with an outer peripheral portion.

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