JP2009113551A - Webbing winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a webbing winding device in which a plurality of energy absorbing members are easily assembled. <P>SOLUTION: A claw portion 140 interferes with held portions 56 and 86 so as to restrict release of connection among a holder 120, a main shaft 52 and a sub shaft 82, and since one quasi-shaft is formed, they can be easily assembled in a spool body 22. Further, since they are assembled by only simply pushing the main shaft 52 and the sub shaft 82 in the axial direction from an end of the holder 120, the main shaft 52 and the sub shaft 82 are easily installed in the holder 120. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a webbing retractor that constitutes a seat belt device of a vehicle.

In the webbing retractor (seat belt retractor) disclosed in Patent Document 1 below, two energy absorbing members (twisted rods) each having a rod shape are arranged coaxially with respect to the spool inside the spool. When the spool is about to rotate in the direction in which the webbing belt is pulled out while the rotation of one of the energy absorbing members is restricted at one end of the spool in the axial direction, energy is absorbed by twisting the energy absorbing member. The spool is allowed to rotate by the amount of twist of the member, and energy is absorbed by deformation of the energy absorbing member. In addition, in the configuration of Patent Document 1, it is possible to select whether only one energy absorbing member is deformed or both energy absorbing members are deformed, whereby the amount of energy absorbed when the spool rotates. Is changing.
Publication of US 2006/0022447 A1

  In the configuration disclosed in Patent Document 1, the ends of the energy absorbing members facing each other are connected in a state where they are prevented from rotating together. Here, in the configuration disclosed in Patent Document 1, splines are formed at the opposite ends of the energy absorbing member, and these ends are respectively inserted into a rotating cylinder (threaded member) to absorb each energy. The inner peripheral part of the rotating cylinder is fitted to the spline of the member.

  However, in the spline fitting structure, relative rotation with each other is restricted (that is, rotation is prevented), but relative movement along the axial direction is possible. For this reason, when assembling each member, it is difficult to work because each energy absorbing member and the rotating cylinder relatively move in the axial direction. For this reason, one of the energy absorbing member and the rotating cylinder is caulked and connected to the other, or the energy absorbing member and the rotating cylinder are connected using a connecting member different from the energy absorbing member and the rotating cylinder, Furthermore, it is necessary to complicate the structure of the spool itself and to restrict the relative movement of each energy absorbing member and the rotating cylinder in the axial direction.

  In view of the above fact, an object of the present invention is to provide a webbing take-up device in which a plurality of energy absorbing members can be easily assembled.

  The webbing take-up device according to the first aspect of the present invention is a spool that winds up the webbing belt by rotating in the pull-out direction with the longitudinal base end of the long belt-like webbing belt locked. The energy engaged by engaging a plurality of energy absorbing members housed inside the spool in a state of being aligned along the axial direction of the spool, and the energy absorbing members adjacent along the axial direction. A connecting means for connecting each of the plurality of energy absorbing members connected and engaged with each of the absorbing members, and for restricting cancellation of the connection to the energy absorbing member when engaged with the energy absorbing member; and the spool The plurality of energy absorbing members are directly or indirectly engaged with the plurality of energy absorbing members housed inside A rotation restricting means for restricting relative rotation of the fixed end that is one of the two ends with respect to the spool; and the fixed end of at least one of the plurality of energy absorbing members; Is a first locked state that restricts rotation of the opposite side in the pull-out direction, and at least one of the plurality of energy absorbing members that is different from the energy absorbing member that is regulated in the first locked state. Lock means capable of switching to a second lock state in which one or all of the energy absorbing members opposite to the fixed ends are restricted from rotating in the pull-out direction.

  In the webbing take-up device according to the first aspect of the present invention, among the plurality of energy absorbing members arranged in a line along the axial direction of the spool, each of the energy absorbing members adjacent to each other along the axial direction is arranged. By engaging the connecting means, the connecting means is connected to these energy absorbing members, whereby each energy absorbing member is connected via the connecting means. Thus, the energy absorption member in the state connected mutually is accommodated inside a spool. Furthermore, relative rotation with the spool is restricted by the rotation restricting means on the fixed end side which is one of the both ends of the plurality of energy absorbing members accommodated in the spool.

  When the locking means operates in the first locked state, at least one energy absorbing member of the plurality of energy absorbing members is restricted by the locking means from rotating in the pull-out direction opposite to the fixed end among the both ends. . For this reason, when the webbing belt is pulled in this state and the spool rotates in the pull-out direction with a force capable of deforming the energy absorbing member restricted by the locking means, the energy absorption restricted by the locking means. The rotation of the spool in the pull-out direction by the amount of deformation of the member, that is, the withdrawal of the webbing belt from the spool is allowed, and a part of the energy for pulling the webbing belt is absorbed.

  On the other hand, when the lock means is switched from the first lock state to the second lock state and the lock means is operated in this state, at least one energy absorption member different from the energy absorption member that is restricted in rotation in the first lock state, Alternatively, the side opposite to the fixed end of all the energy absorbing members is restricted from rotating in the pull-out direction by the lock means. For this reason, when the webbing belt is pulled in this state and the spool rotates in the pull-out direction with a force capable of deforming the energy absorbing member whose rotation is restricted by the locking means, the rotation is restricted by the locking means. The rotation of the spool in the pull-out direction of the energy absorbing member by the amount of deformation, that is, the withdrawal of the webbing belt from the spool is allowed, and a part of the energy for pulling the webbing belt is absorbed.

  Thus, in the webbing take-up device according to the present invention, the combination pattern of the energy absorbing member subject to rotation restriction and the energy absorbing member not subject to rotation restriction differs between the first locked state and the second locked state. The amount of energy required to deform the energy absorbing member subjected to the rotation restriction is also different, and as a result, the amount of energy that can be absorbed by the deformation of the energy absorbing member can be varied.

  Here, in the state in which the connecting means is engaged with the energy absorbing member, cancellation of the connection of the connecting means to the energy absorbing member is restricted. For this reason, the connection of each energy absorption member is maintained because the connection means is engaged with each energy absorption member. For this reason, since each energy absorption member can be connected and accommodated inside the spool, each energy absorption member can be accommodated inside the spool, that is, the assembly of the energy absorption member is facilitated. It does not have to be stored in the spool).

  A webbing take-up device according to a second aspect of the present invention is a spool that winds up the webbing belt by rotating in the pull-out direction with the longitudinal base end of the long webbing belt locked. A pair of energy absorbing members, each base end facing the axial center side of the spool, housed inside the spool on the end side of the intermediate portion along the axial direction of the spool; and the pair of energy By engaging with each of the absorbing members, the energy absorbing member is connected to each of the pair of energy absorbing members to connect one of the pair of energy absorbing members with the other, and in the engaged state with respect to the energy absorbing member, the energy absorbing member A connection means for restricting the release of the connection to the pair, and the pair of energy absorbing members housed inside the spool, directly or indirectly A rotation restricting means for engaging and restricting relative rotation of the base end side of each of the pair of energy absorbing members with respect to the spool; and one distal end side of the pair of energy absorbing members is in the drawing direction A first locked state that restricts rotation to the energy absorbing member, and an energy absorbing member that is different from the energy absorbing member that is regulated in the first locked state among the plurality of energy absorbing members, or the front end sides of all the energy absorbing members are Locking means capable of switching to a second locked state that restricts rotation in the pull-out direction.

  In the webbing take-up device according to the second aspect of the present invention, the coupling means is engaged with both the energy absorbing members, whereby the coupling means is coupled to these energy absorbing members. Both energy absorption members are connected. Thus, the energy absorption member in the state connected mutually is accommodated inside a spool. Further, in each energy absorbing member accommodated in the spool, the relative rotation between the base end side and the spool is restricted by the rotation restricting means.

  When the lock means is operated in the first locked state, one of the pair of energy absorbing members is restricted from rotating in the pull-out direction by the lock means. For this reason, when the webbing belt is pulled in this state and the spool rotates in the pull-out direction with a force that can deform the one energy-absorbing member, the one energy-absorbing member is moved in the pull-out direction by the amount of deformation. Rotation of the spool, that is, withdrawal of the webbing belt from the spool is allowed, and a part of energy for pulling the webbing belt is absorbed.

  On the other hand, when the lock means is switched from the first lock state to the second lock state and the lock means is operated in this state, the energy absorption member is different from the energy absorption member whose rotation is restricted in the first lock state. (The other energy absorbing member) or the tip side of both energy absorbing members is restricted from rotating in the pull-out direction by the locking means. For this reason, when the webbing belt is pulled in this state and the spool rotates in the pull-out direction with a force capable of deforming the energy absorbing member whose rotation is restricted by the locking means, the rotation is restricted by the locking means. The rotation of the spool in the pull-out direction of the energy absorbing member by the amount of deformation, that is, the withdrawal of the webbing belt from the spool is allowed, and a part of the energy for pulling the webbing belt is absorbed.

  Thus, in the webbing take-up device according to the present invention, the combination pattern of the energy absorbing member subject to rotation restriction and the energy absorbing member not subject to rotation restriction differs between the first locked state and the second locked state. The amount of energy required to deform the energy absorbing member subjected to the rotation restriction is also different, and as a result, the amount of energy that can be absorbed by the deformation of the energy absorbing member can be varied.

  Here, in the state in which the connecting means is engaged with the energy absorbing member, cancellation of the connection of the connecting means to the energy absorbing member is restricted. For this reason, the connection of each energy absorption member is maintained because the connection means is engaged with each energy absorption member. For this reason, since both energy absorption members can be connected and accommodated inside the spool, both energy absorption members can be accommodated inside the spool, that is, assembly of the energy absorption members is facilitated (both energy absorption members individually It does not have to be stored in the spool).

  A webbing take-up device according to a third aspect of the present invention is the webbing retractor according to the first or second aspect, wherein the webbing take-up device is provided corresponding to each of the plurality of energy absorbing members. An elastic part capable of coming into contact with the energy absorbing member from a direction inclined with respect to a connecting direction when connecting the connecting means and elastically deforming in a direction away from the energy absorbing member; and provided in the elastic part The connecting means is engaged with the energy absorbing member from the mounting direction side while the connecting means is attached to the energy absorbing member, and the movement of the connecting means in the direction opposite to the attaching direction is restricted, and The elastic portion can be moved while being elastically deformed in a direction away from the energy absorbing member by an external force in a direction opposite to the mounting direction. Including an engaging portion capable of eliminating engagement with yield member is characterized by being configured the connecting means.

  In the webbing retractor according to the third aspect of the present invention, when the connecting means is connected to the energy absorbing member, the connecting means is connected to the energy absorbing member from the direction inclined with respect to the connecting direction when the connecting means is attached to the energy absorbing member. The elastic part comes into contact. Further, in this state, the engaging portion of the connecting means engages with the energy absorbing member from the connecting direction side.

  When trying to move the connecting means in the direction opposite to the connecting direction with respect to the energy absorbing member with the engaging portion engaged with the energy absorbing member, the energy absorbing member is moved from the side opposite to the connecting direction. Interfering with the engaging portion, thereby restricting the movement of the engaging portion in the direction opposite to the connecting direction, and thus the movement of the connecting means in the direction opposite to the connecting direction with respect to the energy absorbing member. For this reason, the connection between the connecting means and the energy absorbing member is maintained, and in the state where the connecting means is connected to each of the plurality of energy absorbing members, the connection of the energy absorbing members via the connecting means is maintained.

  By the way, when an external force in the direction opposite to the connection direction acts on the engaging portion, the engaging portion moves in a direction to cancel the engagement with the energy absorbing member while elastically deforming the elastic portion in a direction away from the energy absorbing member. To do. Therefore, when connecting the connecting means to the energy absorbing member, the engaging means is moved closer to the energy absorbing member (that is, the connecting means is moved in the connecting direction with respect to the energy absorbing member). If the connecting means is moved in the connecting direction as it is applied to the energy absorbing member, the engaging portion moves while elastically deforming the elastic portion by the reaction force from the energy absorbing member. In this state, when the connecting means is further moved in the connecting direction with respect to the energy absorbing member and reaches a position where the engaging portion can be engaged with the energy absorbing member, the engaging portion absorbs the energy by the elasticity of the elastic portion. Move to engage the member.

  Thus, in the present invention, the connecting means can be easily connected to the energy absorbing member by simply moving (approaching) the connecting means in the connecting direction with respect to the energy absorbing member.

  As described above, in the webbing take-up device according to the first and second aspects of the present invention, assembly of each energy absorbing member to the spool is facilitated.

  In the webbing retractor according to the third aspect of the present invention, the connecting means can be easily connected to the energy absorbing member simply by moving (approaching) the connecting means in the approaching direction with respect to the energy absorbing member.

<Configuration of First Embodiment>
FIG. 1 is a front view schematically showing a configuration of a webbing take-up device 10 according to a first embodiment of the present invention (only a webbing belt 24 described later has a cross section). As shown in this figure, the webbing take-up device 10 includes a frame 12. The frame 12 includes a flat plate 14 and is fastened and fixed to a predetermined portion of the vehicle body by a fastening means such as a bolt (not shown) in the vicinity of the seat of the vehicle. Is attached to the car body.

  A flat leg plate 16 extends from one end in the width direction of the back plate 14 (left side in FIG. 1) toward one thickness direction of the back plate 14. On the other hand, from the end of the other side in the width direction of the back plate 14 (the right side in FIG. 1), the back plate so that the flat leg plate 18 faces the leg plate 16 along the width direction of the back plate 14. 14 extends in one thickness direction. A spool 20 is disposed on one side of the back plate 14 in the thickness direction. The spool 20 includes a spool body 22.

  The spool body 22 has a substantially columnar shape that is axial along the opposing direction of the leg plate 16 and the leg plate 18. A longitudinal base end side of the long belt-like webbing belt 24 is locked to the spool body 22, and the spool body 22 is wound in a layered manner from the longitudinal base end side of the webbing belt 24 around the outer periphery of the spool body 22. Stored. A flange portion 26 is formed on one end side (the leg plate 16 side) of the spool body 22 in the axial direction. The flange portion 26 has a disk shape whose outer diameter is larger than the outer diameter of the spool body 22.

  The outer diameter dimension of the flange portion 26 is a disk having a larger diameter than the outer diameter dimension of the spool body 22, and is formed coaxially and integrally with the spool body 22. The leg plate 16 is formed with a substantially circular hole (not shown) corresponding to one end of the spool body 22 in the axial direction. The inner diameter dimension of the hole is larger than the outer diameter dimension of the spool body 22 but smaller than the outer diameter dimension of the flange portion 26. Accordingly, the spool body 22 can pass through the hole at one end side than the flange 26, but the flange 26 cannot pass through the hole. That is, when the flange portion 26 abuts on the leg plate 16 in the vicinity of the hole portion, further displacement of the spool body 22 toward the leg plate 16 side is restricted.

  On the other hand, a flange portion 30 is formed on the other axial end side (leg plate 18 side) of the spool body 22. The flange portion 30 has a disk shape whose outer diameter is larger than the outer diameter of the spool body 22, and is formed on the spool body 22 coaxially and integrally with the spool body 22. A hole 32 is formed in the leg plate 16 corresponding to the flange 30. The hole portion 32 has a larger inner diameter than the flange portion 30, and one side (that is, the side opposite to the spool body 22) passes through the hole portion 32 from the axial direction intermediate portion of the flange portion 30.

  Further, as shown in FIG. 2, a through hole 34 is formed in the spool body 22. As shown in FIG. 9, the through hole 34 is formed on the central axis of the spool body 22 and opens at both axial ends of the spool body 22. The through hole 34 includes a mounting portion 36. The mounting portion 36 is formed at an intermediate portion of the through hole 34 oriented along the central axis of the spool body 22. The through hole 34 includes a tapered portion 38. The tapered portion 38 is formed adjacent to the mounting portion 36 on the other side along the axial direction of the spool body 22 with respect to the mounting portion 36.

  The inner peripheral shape of the taper portion 38 is the same as that of the mounting portion 36, but the inner diameter dimension gradually increases toward the other axial end of the spool body 22. A lock base mounting portion 40 is formed on the opposite side of the taper portion 38 from the mounting portion 36. The lock base mounting portion 40 has an inner peripheral shape that is sufficiently larger than the taper portion 38 and is formed in a circular shape that is substantially coaxial with the central axis of the spool body 22. It opens at the leg plate 18 side end of the main body 22.

  On the other hand, a sleeve mounting portion 42 is formed on the opposite side of the mounting portion 36 from the tapered portion 38. The sleeve mounting portion 42 is formed in a circular shape whose inner peripheral shape is substantially coaxial with the central axis of the spool body 22, and is at one end in the axial direction of the spool body 22 (the end on the leg plate 16 side of the spool body 22). It is open. Further, the inner peripheral shape of the sleeve mounting portion 42 is sufficiently larger than the inner peripheral shape of the mounting portion 36, and therefore, a bottom wall portion 44 is formed on the mounting portion 36 side of the sleeve mounting portion 42.

  A torsion shaft 50 as an energy absorbing means is disposed inside the through hole 34 having the above configuration. The torsion shaft 50 includes a main shaft 52 as an energy absorbing member. The main shaft 52 includes a substantially cylindrical main body 54. As shown in FIG. 9, a held portion 56 is formed at one axial end portion of the main body 54. As shown in FIG. 2, the cross-sectional shape of the held portion 56 cut along the direction orthogonal to the axial direction (longitudinal direction) of the main body 54 is similar to the inner peripheral shape of the mounting portion 36 and mounted. The regular hexagonal shape is smaller than the inner peripheral shape of the portion 36. Further, as shown in FIG. 9, when the cross-sectional shape of the held portion 56 is regarded as a regular hexagonal shape, the interval between the sides facing each other is larger than the outer diameter dimension of the main body 54 and is coaxial with the mounting portion 36. Is formed.

  On the other hand, a stopper 58 having an outer diameter larger than the outer diameter of the main body 54 and smaller than the inner diameter of the lock base mounting portion 40 is formed at the end of the main body 54 opposite to the held portion 56. . A shaft 60 is coaxially formed with respect to the main body 54 from the end of the stopper 58 opposite to the held portion 56. As shown in FIG. 1, a housing 64 of a first lock mechanism 62 constituting a locking means is attached to the leg plate 18 on the outer side of the leg plate 18 (on the side opposite to the leg plate 16 of the leg plate 18). The tip end side of 60 enters the inside of the housing 64.

  On the inner side of the housing 64, a rotation transmission mechanism such as a gear meshing with a gear fitted to a spline portion 66 formed at the tip of the first lock mechanism 62, an acceleration sensor for detecting a sudden deceleration state of the vehicle, A drawer detection mechanism that operates when the wound webbing belt 24 is rapidly pulled out is accommodated. As shown in FIG. 9, a lock base 68 constituting the first lock mechanism 62 is attached to the stopper 58 side of the main body 54. A part of the lock base 68 facing the spool main body 22 along the axial direction of the spool main body 22 enters the inside of the lock base mounting portion 40, and can be relatively rotated coaxially with the spool main body 22. .

  Further, a stopper 58 is engaged with the lock base 68 attached to the main body 54 so that the relative rotation of the lock base 68 with respect to the main body 54 is disabled. External ratchet teeth 70 are formed on the outer periphery of the lock base 68. Corresponding to the ratchet teeth 70, the frame 12 is provided with a lock plate (not shown) that constitutes the first lock mechanism 62. The lock plate is movable toward and away from the ratchet teeth 70, and when the first lock mechanism 62 is actuated by the sudden rotation of the spool body 22 in the sudden deceleration state or the pull-out direction of the vehicle, The lock plate meshes with the ratchet teeth 70 to restrict the rotation of the ratchet teeth 70 in the pull-out direction.

  As shown in FIG. 9, the torsion shaft 50 includes a sub shaft 82 as an energy absorbing member. The sub shaft 82 includes a substantially cylindrical main body 84. As shown in FIG. 9, in this embodiment, the outer diameter dimension of the main body 84 is smaller than the outer diameter dimension of the main body 54 constituting the main shaft 52, and the axial length of the main body 84 is also set. Is shorter than the axial length of the main body 54. However, the outer diameter dimension of the main body 84 may be greater than or equal to the outer diameter dimension of the main body 54, and the axial length of the main body 84 may be greater than or equal to the axial length of the main body 54.

  The sub shaft 82 is disposed so that the main body 84 and the main body 54 are coaxially arranged on the other axial end side of the main shaft 52 (that is, the side opposite to the main body 54 of the held portion 56). A held portion 86 is formed at the end of the main body 84 on the main shaft 52 side. The cross-sectional shape of the held portion 86 cut in a direction orthogonal to the axial direction of the main body 84 is the same as the cross-sectional shape of the held portion 56 constituting the main shaft 52.

  On the other hand, a mounting portion 88 is formed at the end of the main body 84 opposite to the held portion 86. The cross-sectional shape of the mounting portion 88 cut in a direction perpendicular to the axial direction of the main body 84 is a non-circular shape larger than that of the main body 84. Is a large polygon (more specifically, a regular hexagon in this embodiment), and the mounting portion 88 is formed coaxially with the main body 84. A sleeve 90 is attached to the sub shaft 82. The sleeve 90 includes a circular portion 92 whose outer diameter is substantially equal to the inner diameter of the sleeve mounting portion 42 (strictly, it is extremely slightly smaller).

  One end surface in the axial direction of the circular portion 92 has a non-circular outer peripheral shape. In particular, in the present embodiment, a polygon having a smaller distance between opposing sides than the outer diameter of the circular portion 92 (more specifically, A support portion 94 having a regular hexagonal shape in the embodiment is formed coaxially with the circular portion 92. The sleeve 90 is formed with fitting insertion holes 96 opened at both ends of the sleeve 90. The inner circumferential shape of the fitting hole 96 is the same as the outer circumferential shape of the mounting portion 88 (strictly, a slightly larger similar shape), and in the state where the mounting portion 88 is inserted into the fitting hole 96, Relative rotation of the sleeve 90 with respect to the shaft 82 is disabled. Further, in a state where the mounting portion 88 and a part of the main body 84 are inserted into the fitting insertion hole 96 from the circular portion 92 side, the end surface of the circular portion 92 opposite to the support portion 94 abuts against the bottom wall portion 44. It is possible to enter the sleeve mounting portion 42.

  Further, the stopper 100 is attached to the sub shaft 82 in a state where the sleeve 90 is mounted on the sub shaft 82. The stopper 100 includes a flange portion 102. The flange portion 102 has a disk shape whose outer peripheral shape is larger than that of the inner peripheral shape of the insertion hole 96. A male screw portion 104 is formed coaxially with the flange portion 102 on one end face of the flange portion 102. The male screw portion 104 is a so-called “reverse screw”. In contrast, the mounting portion 88 is formed with a male screw portion 106 that is open at the end of the mounting portion 88 on the side opposite to the main body 84 so as to be coaxial with the main body 84. The male screw portion 106 is a “reverse screw” that allows the male screw portion 104 to be screwed together. A spline portion 108 is coaxially formed with respect to the flange portion 102 and the male screw portion 104 at the end of the flange portion 102 opposite to the male screw portion 104.

  As shown in FIG. 1, a housing 112 of a second lock mechanism 110 constituting a locking means is attached to the leg plate 16 on the outside of the leg plate 16 (on the opposite side of the leg plate 16 from the leg plate 18). The front end side of the sub shaft 82 including the stopper 100 enters the inside of the housing 112. The above-mentioned support portion 94 is fitted with a rotating body that rotates integrally with the support portion 94, and directly or indirectly engages with the rotating body to restrict the rotation of the rotating body in the pull-out direction. The housing 112 is housed inside.

  Further, in the present embodiment, the second lock mechanism 110 can be operated in conjunction with the first lock mechanism 62 and, for example, an occupant seated in a seat corresponding to the webbing take-up device 10 can be used. Based on the detection result of the physique detection means for detecting physique information such as body weight, the second lock mechanism 110 can be switched between an operable state and an inoperable state.

  On the other hand, as shown in FIG. 9, the spool 20 includes a holder 120 as a rotation restricting means and a connecting means. As shown in FIG. 3, the holder 120 includes a plurality of (two in the present embodiment) holding pieces 122. The holding piece 122 is formed in a flat plate shape. The thickness dimension of the holding piece 122 is such that the held portion 56 of the main shaft 52 and the held portion 86 of the sub shaft 82 are arranged coaxially with respect to the mounting portion 36. It is set so as to be substantially equal (strictly slightly smaller) to the gap formed between the outer peripheral portion and the inner peripheral portion of the mounting portion 36. The holding piece 122 includes a rectangular base 124. A holding portion 126 extends from both longitudinal ends of the base portion 124 along the axial direction of the spool body 22. The holding part 126 has a tapered shape in which the width dimension gradually decreases in a direction away from the base part 124.

  The holder 120 includes a plurality of (three in this embodiment) engagement pieces 132. The engaging piece 132 is formed in a rectangular flat plate shape whose longitudinal direction is along the longitudinal direction of the holding piece 122 as a whole. The width dimension of the engagement piece 132 is substantially equal to the width dimension of the base portion 124, and the thickness dimension of the engagement piece 132 is basically set to be the same as that of the holding piece 122. A substantially central portion in the longitudinal direction of the engagement piece 132 is a base portion 134. The both sides in the longitudinal direction of the engagement piece 132 are made to be elastic portions 136 rather than from both ends of the base portion 134 along the longitudinal direction of the engagement piece 132.

  A rectangular hole 138 having a substantially rectangular shape is formed in an intermediate portion of the elastic portion 136 along the longitudinal direction of the engagement piece 132. When both the outer peripheral shape of the engaging piece 132 and the inner peripheral shape of the rectangular hole 138 are regarded as a rectangle, each side of the rectangular hole 138 and each side of the engaging piece 132 corresponding to each side of the rectangular hole 138 The rectangular holes 138 are formed so that are parallel to each other. Further, a claw portion 140 as an engaging portion extends from the inner peripheral portion of each rectangular hole 138.

  The claw portion 140 has a substantially rectangular shape whose outer peripheral shape is smaller than the inner peripheral shape of the rectangular hole 138. Each claw portion 140 extends from a portion of the inner peripheral portion of the rectangular hole 138 located on the side opposite to the base portion 134 (that is, a portion facing the longitudinal center side of the engagement piece 132). Further, the claw portion 140 is bent toward the one side in the thickness direction of the engagement piece 132 around the axis having the width direction of the engagement piece 132 as the axial direction around the boundary portion with the inner peripheral portion of the rectangular hole 138. Yes.

  The holder 120 having the holding piece 122 and the engaging piece 132 includes a bridge 142. The bridge 142 is formed at the end in the width direction of the holding piece 122 and the engaging piece 132, and the holding piece 122 and the engaging piece 132 are alternately connected by the bridge 142. In addition, the holder 120 is bent around an axis whose longitudinal direction is the longitudinal direction of the holding piece 122 and the engaging piece 132 in the bridge 142. The shape of the holder 120 when viewing the holder 120 along the longitudinal direction of the holding piece 122 and the engaging piece 132 basically follows the inner peripheral shape of the mounting portion 36.

  However, the holder 120 does not have an annular shape because a part (particularly, one side of a regular hexagon in the present embodiment) along the inner circumferential direction of the mounting portion 36 is missing. Further, the claw portion 140 is formed so that the similar shape to the outer peripheral shape of the held portions 56 and 86 that connects the front end sides of the respective claw portions 140 is smaller than the outer peripheral shape of the held portions 56 and 86.

  Further, the distance between the tip of the claw 140 on one side along the longitudinal direction of the engagement piece 132 and the tip of the claw 140 on the other side is the held portion 56 along the axial direction of the main body 54. The length of the engagement piece 132, the formation position of the claw portion 140, and the like are set so as to be equal to or larger than the sum of the dimensions of the held portion 86 along the axial direction of the main body 84. Inside the holder 120 having the above configuration, the held portion 56 and the held portion are provided between the distal end portion of the claw portion 140 on one side in the longitudinal direction of the engagement piece 132 and the distal end portion of the claw portion 140 on the other side. 86, the held portion 86 side of the sub shaft 82 enters from one side in the longitudinal direction of the held portion 56 and the holding piece 122, and the main shaft 52 is held from the other side in the longitudinal direction of the holding piece 122. The side of the part 56 has entered.

  Further, the main shaft 52 and the sub shaft 82 in a state where the held portion 56 side and the held portion 86 side enter the inside of the holder 120 penetrate to the position where the stopper 58 hits the bottom of the lock base mounting portion 40. It enters the inside of the hole 34. With the stopper 58 abutting against the bottom of the lock base mounting portion 40, the sub shaft 82 is moved to the main shaft until the held portion 86 comes into contact with one claw portion 140 and the held portion 56 comes into contact with the other claw portion 140. The projecting dimension of the sub shaft 82 from the end of the mounting portion 36 when spaced from the mounting portion 36 (that is, the length from the bottom wall portion 44 along the axial direction of the through hole 34 to the end of the mounting portion 88) Is set to be equal to or smaller than the axial dimension of the sleeve 90.

<Operation and Effect of First Embodiment>
(Functions and effects of the webbing take-up device 10)
Next, functions and effects in the functional aspect of the webbing take-up device 10 will be described.

  In the webbing retractor 10, the acceleration sensor of the first lock mechanism 62 detects that the vehicle is suddenly decelerating, or the body of an occupant trying to move rapidly to the front side of the vehicle due to the inertia of such rapid deceleration is detected. When the spool 20 rapidly rotates in the pull-out direction by rapidly pulling the mounted webbing belt 24, first, the lock plate meshes with the ratchet teeth 70 of the lock base 68 of the first lock mechanism 62. One lock state is established, and the rotation of the lock base 68 in the pull-out direction is restricted. The lock base 68 is assembled in a state in which the lock base 68 is prevented from rotating around the main shaft 52 of the torsion shaft 50 by a stopper 58. For this reason, the rotation of the lock base 68 in the pull-out direction is restricted, so that the rotation of the main shaft 52 in the pull-out direction is restricted.

  Further, the outer peripheral shape of the held portion 56 of the main shaft 52 and the inner peripheral shape of the mounting portion 36 of the through hole 34 are non-circular similar shapes, and are interposed between the held portion 56 and the through hole 34. The thickness of the holding piece 122 and the engaging piece 132 of the holder 120 is substantially the same as the gap between the held portion 56 and the through hole 34. For this reason, the main shaft 52 and the spool body 22 are prevented from rotating together. Therefore, as described above, the rotation of the main shaft 52 in the pull-out direction is restricted, so that the rotation of the spool body 22 in the pull-out direction is restricted.

  In this state, rotational force in the pull-out direction that exceeds the torsional rigidity of the main body 52 of the main shaft 52 is applied to the spool main body 22, and the spool main body 22 moves the held portion 56 of the main shaft 52 in the pull-out direction. The main body 54 is twisted and deformed by rotating. The spool body 22 is allowed to rotate by an amount corresponding to the torsional deformation of the main body 54, and the webbing belt 24 is pulled out from the spool main body 22 by this amount of rotation, and the pulling force of the webbing belt 24 is applied to the torsional deformation of the main body 54. A part of the pulling force is absorbed.

  On the other hand, when the second lock mechanism 110 is activated while the first lock mechanism 62 is activated, the second lock state is established, and the rotation of the rotating body that rotates together with the support portion 94 in the pull-out direction is restricted. In the sleeve 90 having the support portion 94, the mounting portion 88 of the sub shaft 82 is inserted into the insertion hole 96, and the mounting portion 88 and the sleeve 90 are prevented from rotating together. Accordingly, the rotation of the sleeve 90 in the pull-out direction together with the rotating body is restricted, so that the rotation of the sub shaft 82 in the pull-out direction is restricted.

  The outer peripheral shape of the held portion 86 of the subshaft 82 and the inner peripheral shape of the mounting portion 36 of the through hole 34 are non-circular similar shapes, and are interposed between the held portion 86 and the through hole 34. The thickness of the holding piece 122 and the engaging piece 132 of the holder 120 is substantially the same as the gap between the held portion 86 and the through hole 34. For this reason, the sub shaft 82 and the spool body 22 are prevented from rotating together. Therefore, as described above, the rotation of the sub-shaft 82 in the pull-out direction is restricted, and thus the rotation of the spool body 22 in the pull-out direction is restricted.

  In this state, since the first lock mechanism 62 is also operated, the rotational force in the pull-out direction with a magnitude exceeding the sum of the torsional rigidity of both the main body 54 of the main shaft 52 and the main body 84 of the sub shaft 82 is exerted. The spool body 22 is applied to the spool body 22, and the spool body 22 rotates the held portion 56 of the main shaft 52 and the held portion 86 of the sub shaft 82 in the pull-out direction to twist and deform both the main body 54 and the main body 84. The spool body 22 is allowed to rotate by an amount corresponding to the torsional deformation of the main body 54 and the main body 84, and the webbing belt 24 is pulled out from the spool main body 22 by this amount of rotation. A tensile force is applied and a part of the tensile force is absorbed.

  As described above, the second lock mechanism 110 is configured to be interlocked with the first lock mechanism 62, and further, for example, a physique that detects physique information such as the weight of an occupant seated in a seat corresponding to the webbing take-up device 10. Based on the detection result of the detecting means, the second lock mechanism 110 can be switched between an operable state and an inoperable state. For this reason, when the second lock mechanism 110 is in an operable state, the pulling direction in a direction exceeding the sum of the torsional rigidity of both the main body 54 of the main shaft 52 and the main body 84 of the sub shaft 82 is increased. When the rotation of the spool body 22 is allowed by the rotational force and the second lock mechanism 110 is inoperable, the rotation of the main shaft 52 in the pull-out direction exceeds the torsional rigidity of the body 54. The force allows the spool body 22 to rotate, and the amount of energy that can be absorbed can also be changed.

(Operations and effects on the assembly surface of the webbing take-up device 10)
Next, the operation and effect of the present embodiment on the assembly surface will be described through the description of the assembly process of the spool 20.

  The assembly process of the spool 20 includes a first connection process. In the first connecting step, the main shaft 52 with the lock base 68 assembled and the holder 120 are connected. As shown in FIG. 4, in the first connecting step, first, the end portions of the holding piece 122 and the engaging piece 132 on one side along the longitudinal direction of the holding piece 122 are abutted against the abutting tool 162. In this state, the longitudinal direction of the main body 54 and the longitudinal direction of the holding piece 122 are substantially the same direction, and the end of the holder 120 opposite to the abutting tool 162 and the held portion 56 are aligned along this direction. The main shaft 52 is disposed so as to face each other.

  The main shaft 52 is caused to approach the holder 120 along the longitudinal direction of the main body 54 and the holding piece 122 (that is, the holder 120 relatively approaches the main shaft 52). In this way, when the held portion 56 is inserted inside the holder 120 from the end opposite to the abutting tool 162 of the holder 120, as shown in FIG. It contacts the claw portion 140. When the main shaft 52 is further moved to the holder 120 side in this state, the held portion 56 in a radial direction orthogonal to the axial direction of the held portion 56 (that is, in a direction away from the axis of the held portion 56). Presses the claw portion 140.

  When the nail | claw part 140 is pressed by the to-be-held part 56, as FIG.5 (B) shows, the elastic part 136 will be elastically deformed around the axis | shaft which makes the width direction of the base part 134 an axial direction, and this elastic part With the elastic deformation 136, the claw portion 140 moves. By further moving the main shaft 52 from this state, as shown in FIG. 5C, when the claw portion 140 is positioned on the main body 54 side with respect to the held portion 56, the held portion with respect to the claw portion 140 is retained. The interference from 56 is eliminated, and the elastic portion 136 is restored to its original shape.

  As a result, the claw portion 140 has its tip side positioned closer to the axial center of the main body 54 than the outer peripheral portion of the held portion 56. Therefore, in this state, if the main shaft 52 is moved in the direction opposite to the moving direction of the main shaft 52 with respect to the holder 120 when the held portion 56 is inserted inside the holder 120, the held portion 56. The end of the main body 54 is brought into contact with the claw portion 140, and the movement of the main shaft 52 is restricted. For this reason, basically, the main shaft 52 cannot be moved in the direction opposite to the moving direction of the main shaft 52 relative to the holder 120 when the held portion 56 is inserted inside the holder 120.

  The assembly process of the spool 20 includes a second connection process. As shown in FIG. 6, in the second connecting step, the held portion 86 enters the inside of the holder 120 from the end of the holder 120 opposite to the side where the held portion 56 enters, and the holder 120 and the sub shaft 82. And are connected. In this second connecting step, the end of the side opposite to the side into which the held portion 56 enters is abutted against an abutting tool 164 instead of the abutting tool 162, and the approaching direction of the sub shaft 82 with respect to the holder 120 is determined. Other than the point that is opposite to the approaching direction of the main shaft 52 with respect to the holder 120, and the part that interferes with or presses the claw part 140 is not the held part 56 but the held part 86. Since this is basically the same as the first connecting step, the description of the details of the second connecting step will be omitted.

  The order of the first connecting step and the second connecting step is not particularly related, and the second connecting step may be performed after the first connecting step, or the first connecting step after the second connecting step. May be performed.

  Thus, the main shaft 52 and the sub shaft 82 are connected by the holder 120 through the first connecting step and the second connecting step. Here, as described above, the claw portion 140 interferes with the held portion 56 and the held portion 86, so that the movement of the main shaft 52 and the sub shaft 82 in the direction of coming out of the holder 120 is restricted. The main shaft 52 and the subshaft 82 are not separated from each other more than the state in which the claw portion 140 is in contact with the holding portion 56 and the held portion 86.

  Moreover, even though a part of the holder 120 is missing, the inner peripheral shape of the holder 120 follows the outer peripheral shape of the held portion 56 and the held portion 86, so that the held portion 56 and the held portion are held inside the holder 120. In the state where the portion 86 is inserted, the holding piece 122 and the engaging piece 132 abut on the held portion 56 and the held portion 86. Accordingly, the held portion 56 and the held portion 86 are held by the holding pieces 122 and the engaging pieces 132, and the main shaft 52 and the sub shaft 82 are arranged so that the axial direction of the main body 54 and the axial direction of the main body 84 intersect. It is restricted that one of them tilts with respect to the other.

  The assembly process of the spool 20 includes a torsion shaft insertion process. In this torsion shaft insertion step, the sub shaft 82 connected to the main shaft 52 by the holder 120 is inserted into the through hole 34 from the mounting portion 36 side. As shown in FIG. 7, in this torsion shaft insertion step, the axial direction of the spool body 22 and the axial direction of the sub shaft 82 are aligned substantially coaxially, and the flange portion 30 side of the spool body 22 is arranged. The end portion and the mounting portion 88 are opposed to each other, and in this state, the sub shaft 82 enters the through hole 34 from the opening portion of the tapered portion 38 on the side opposite to the mounting portion 36.

  Here, the thickness dimension of the holding piece 122 and the engaging piece 132 is set such that the held portions 56 and 86 are coaxially arranged with respect to the mounting portion 36 and the outer peripheral portions of the held portions 56 and 86 and the mounting portion 36. It is substantially equal to the gap generated between the inner peripheral portion of each of them. Therefore, the outer peripheral shape of the holder 120 in a state where the held portions 56 and 86 enter the inside of the holder 120 is substantially the same as the inner peripheral shape of the mounting portion 36. However, since the taper portion 38 gradually increases in inner circumferential shape toward the side opposite to the mounting portion 36, the outer peripheral surface of the holder 120 and the taper portion 38 at the opening end of the taper portion 38 opposite to the mounting portion 36. A gap is formed between the inner peripheral surface of each of the two. For this reason, the holder 120 can enter the inside of the through hole 34 relatively easily.

  Moreover, since the tapered portion 38 gradually approaches the inner peripheral shape of the mounting portion 36 toward the mounting portion 36, the holder 120 easily enters the mounting portion 36 from the boundary portion between the tapered portion 38 and the mounting portion 36, All or most of the holder 120 is accommodated in the mounting portion 36.

  In addition, the elastic portion 136 is elastically deformed when the held portion 56 or the held portion 86 enters the inside of the holder 120, but when the sub shaft 82 is caused to enter the inside of the through hole 34, the elastic portion 136 is completely Even if the original shape is not restored, the inner peripheral shape of the tapered portion 38 at the opening end opposite to the mounting portion 36 of the tapered portion 38 is larger than the inner peripheral shape of the mounting portion 36. Therefore, the holder 120 enters the inside of the taper portion 38 without the end portion of the elastic portion 136 interfering greatly, and the end portion of the elastic portion 136 interferes with the inner peripheral surface of the taper-shaped taper portion 38. As the main shaft 52 enters the inside of the through hole 34, the elastic portion 136 is forcibly returned to the original shape.

  Thus, by forming the tapered portion 38 in the through hole 34, the holder 120 does not become a major obstacle when the main shaft 52 enters the inside of the through hole 34. The holder 120 and the sub shaft 82 can be inserted into the through hole 34.

  In this way, when all or most of the holder 120 enters the mounting portion 36 and the ratchet teeth 70 abut against the bottom of the lock base mounting portion 40, the torsion shaft insertion process is completed. In this state, the holding piece 122 and the engaging piece 132 are in close contact with the outer peripheral portion of the held portion 56 and the held portion 86, and the inner peripheral portion of the mounting portion 36 is in close contact with the holding piece 122 and the engaging piece 132. . For this reason, the elastic deformation of the elastic portion 136 in the direction away from the axis of the main shaft 52 or the sub shaft 82 (that is, the direction away from the outer peripheral portion of the held portion 56 or the held portion 86) is prevented.

  Therefore, in this state, the end portion of the held portion 56 opposite to the main body 54 and the claw portion 140 are opposed to each other, and the end portion of the held portion 86 opposite to the main body 84 and the claw portion 140 is opposed to each other. Since the state is maintained, the held portion 56 and the held portion 86 do not come out of the holder 120. In addition, since the outer peripheral shape of the held portion 56 and the held portion 86, the inner peripheral shape of the holder 120, the outer peripheral shape of the holder 120, and the inner peripheral shape of the mounting portion 36 are non-circular, In a state where the holding piece 122 and the engaging piece 132 are in close contact with the outer peripheral portion of the portion 86 and the inner peripheral portion of the mounting portion 36 is in close contact with the holding piece 122 and the engaging piece 132, the held portions 56 and 86 and the holder 120 are held. And the spool body 22 do not rotate relative to each other coaxially. Therefore, basically, the rotational force of the spool body 22 is transmitted to the main shaft 52 and the sub shaft 82, and if the rotation is restricted by the main shaft 52 or the sub shaft 82, the rotation of the spool body 22 is also restricted.

  The assembly process of the spool 20 includes a fastening process. In this fastening step, as shown in FIG. 8, the insertion hole 96 is fitted from the side of the mounting portion 88 to the main shaft 52 protruding from the end of the mounting portion 36 on the side opposite to the tapered portion 38. The male screw portion 104 of the stopper 100 is screwed into the male screw portion 106 of the mounting portion 88. When engaged with the male thread portion 106, the flange portion 102 of the stopper 100 presses the end portion of the support portion 94 opposite to the circular portion 92. In this way, when the sleeve 90 receives the pressing force from the flange portion 102, the spool body 22 is in contact with the circular portion 92 in contact with the bottom wall portion 44 of the sleeve mounting portion 42 and the bottom portion of the lock base mounting portion 40. By being sandwiched between the ratchet teeth 70, the movement received by the main shaft 52 and the sub shaft 82 along the axial direction of the spool body 22 is restricted.

  As described above, in the present embodiment, although the torsion shaft 50 is configured to include the main shaft 52 and the sub shaft 82, the main shaft 52 and the sub shaft 82 are connected by the holder 120, so that the pseudo Therefore, the assembly to the spool body 22 is simplified.

  Moreover, it is difficult for the main shaft 52 and the sub shaft 82 connected by the holder 120 to rotate relative to each other around the axis. Therefore, this also facilitates the assembly to the spool body 22.

  Further, in the present embodiment, the main shaft 52 and the sub shaft 82 can be assembled to the holder 120 simply by pushing the main shaft 52 and the sub shaft 82 from the end of the holder 120. The assembly of the shaft 52 and the sub shaft 82 is simple.

  Further, since the holder 120 can be manufactured by punching and bending a metal flat plate, the cost is low.

  Further, if the main shaft 52 and the sub shaft 82 basically have the same sum of the axial dimensions, the same holder 120 can be applied even if the length and thickness of the main body 54 and the main body 84 are changed. For this reason, it is also possible to easily change the amount of energy absorbed.

  Further, in the present embodiment, since the main shaft 52 and the sub shaft 82 are connected by the holder 120, the length ratio of the main shaft 52 and the sub shaft 82 can be freely set, and the main shaft Even if the ratio of the lengths of the main shaft 52 and the sub shaft 82 is the same, the diversion is possible without changing the configuration of the spool body 22.

  In the present embodiment, the holding pieces 122 and the engaging pieces 132 are alternately arranged. However, the holding pieces 122 and the engaging pieces 132 do not have to be arranged alternately. Instead of this, the engagement piece 132 may be provided, or only one engagement piece 132 may be provided and the other may be constituted by the holding pieces 122.

  Further, as shown in FIG. 3, in this embodiment, the holding piece 122 and the engaging piece 132 of the holder 120 are flat, and the thickness direction of the base portion 124 and the thickness direction of the holding portion 126 are the same direction. The thickness direction of the base portion 134 and the thickness direction of the elastic portion 136 are the same direction. However, at least one holding piece 122 out of the plurality of holding pieces 122 may be inclined in the thickness direction of the holding portion 126 with respect to the thickness direction of the base portion 124, and the plurality of holding pieces 122 may be engaged. At least one engagement piece 132 of the pieces 132 may be inclined in the thickness direction of the elastic portion 136 with respect to the thickness direction of the base portion 134.

  An example of such a configuration is shown in FIG. The holding piece 122 of the holder 120 shown in this figure has the holding portion 126 bent with respect to the base portion 124 about an axis whose axial direction is the width direction of the holding piece 122 around the boundary between the base portion 124 and the holding portion 126. ing. Further, the engaging piece 132 has the elastic portion 136 bent with respect to the base portion 134 around an axis whose axial direction is the width direction of the engaging piece 132 with the boundary between the base portion 134 and the elastic portion 136 as the center.

  When the holder 120 is viewed along the axial direction of the torsion shaft 50 (not shown in FIG. 11), the holder 120 in which the holding piece 122 and the engaging piece 132 are bent as described above is the torsion shaft 50 (in FIG. 11). When the shape of the holder 120 when viewing the holder 120 along the axial direction (not shown) is regarded as a hexagon, each end of the holding portion 126 and the elastic portion 136 (the end on the side opposite to the base 124 and the base 134) ) Is larger than the hexagons at the base 124 and the base 134.

  In the base 124 and the base 134, if the width of the base 124 and the base 134 is set so that the held portion 56 of the main shaft 52 and the held portion 86 of the sub shaft 82 are in contact with each other, The hexagon at each tip (the end opposite to the base 124 and the base 134) of the combined piece 132 is larger than the outer peripheral shape of the held portion 56 and the held portion 86. Therefore, when the holding portion 126 is bent with respect to the base portion 124 and the elastic portion 136 is bent with respect to the base portion 134 as described above, the main shaft 52 and the sub shaft 82 are moved from the distal end side of the holding portion 126 and the elastic portion 136. Easy to fit.

  Further, when the hexagons at the tips of the holding part 126 and the elastic part 136 are made larger than the hexagons at the base part 124 and the base part 134, the taper part at the end of the taper part 38 opposite to the mounting part 36. It goes without saying that the holder 120 can be easily inserted into the tapered portion 38 when the hexagonal shape at each end of the holding portion 126 and the elastic portion 136 is made smaller than the inner peripheral shape of the 38.

<Configuration of Second Embodiment>
Next, other embodiments of the present invention will be described. In describing each of the following embodiments, the same parts as those in the previous embodiment are basically the same as those in the embodiment described above including the first embodiment. Reference numerals are assigned and detailed description thereof is omitted.

  FIG. 11 is a perspective view showing a holder 182 as a rotation restricting means and a connecting means, which are the main parts of the webbing take-up device 180 according to the second embodiment of the present invention. As shown in this figure, the holder 182 of the webbing take-up device 180 has three holding pieces corresponding to each hexagonal side that is the inner peripheral shape of the tapered portion 38 (through hole 34) of the spool 184. 122 and three engaging pieces 132 are provided. The holding pieces 122 and the engaging pieces 132 in the holder 182 are alternately provided with the holding pieces 122 and the engaging pieces 132 along the inner circumferential direction of the through-hole 34 as in the case of the holder 120 in the first embodiment. In addition, the holding piece 122 and the engaging piece 132 are connected by the bridge 142.

  However, one holding piece 122A among the plurality of holding pieces 122 and an engaging piece 132A adjacent to the holding piece 122A on one side in the inner circumferential direction of the through hole 34 among the plurality of engaging pieces 132 The bridge 142 is not provided between them, and the holding piece 122A and the engaging piece 132A are not connected.

  On the other hand, as shown in FIG. 12B, a webbing insertion hole 188 is formed in the spool 184 constituting the webbing take-up device 180. The webbing insertion hole 188 is formed at a position displaced to the outer peripheral side from the center of the spool 184 along one direction orthogonal to the axial direction of the spool 184. The webbing insertion hole 188 has an opening dimension of the webbing insertion hole 188 along the axial direction of the spool 184 larger than the width dimension of the webbing belt 24, and the opening dimension of the webbing insertion hole 188 along the circumferential direction of the spool 184 is It is larger than twice the thickness dimension of the webbing belt 24.

  One end of the webbing insertion hole 188 opens at the outer peripheral surface of the spool body 186 of the spool 184. On the other hand, the other end of the webbing insertion hole 188 opens at the inner surface of the stopper accommodation hole 190. In the stopper receiving hole 190, the opening size of the stopper receiving hole 190 along the axial direction of the spool 184 is set to be equal to or larger than the width size of the webbing belt 24, and the opening size of the stopper receiving hole 190 along the circumferential direction of the spool 184 is It is sufficiently larger than the opening dimension of the webbing insertion hole 188 along the circumferential direction of the spool 184. In this way, the webbing insertion hole 188 in which the stopper accommodation hole 190 is formed on the other end side is parallel to one side of the hexagon that is the inner peripheral shape of the through-hole 34 from one end to the other end. The webbing insertion hole 188 and the through hole 34 communicate with each other on the one side.

  The webbing belt 24 is passed through the webbing insertion hole 188 from one end side. The proximal end side of the webbing belt 24 is folded back to the distal end side, and is sewn except for a cylindrical stopper insertion portion 192 formed near the longitudinal proximal end portion of the webbing belt 24 in the folded state. A stopper 194 is inserted through the stopper insertion portion 192. The stopper 194 has a cylindrical shape whose axial direction is along the axial direction of the spool 184.

  Further, the outer diameter (diameter) dimension of the stopper 194 is sufficiently larger than the opening dimension of the webbing insertion hole 188 along the circumferential direction of the spool 184, and the opening dimension of the stopper accommodating hole 190 along the circumferential direction of the spool 184. Smaller than. When the stopper 194 is inserted into the stopper insertion portion 192, the stopper insertion portion 192 cannot pass through the webbing insertion hole 188, whereby the longitudinal base end side of the webbing belt 24 is locked to the spool body 186.

  As described above, the holder 182 is disposed in the through hole 34 communicated with the webbing insertion hole 188 as in the first embodiment. Here, as shown in FIG. 12A, among the plurality of holding pieces 122, the holding piece 122 </ b> A penetrates at a portion other than the communication portion with the webbing insertion hole 188 in the inner peripheral portion of the through hole 34. It is in contact with the inner periphery of the hole 34. Further, among the plurality of engagement pieces 132, the engagement piece 132 </ b> A is in contact with the inner peripheral portion of the through hole 34 at a portion other than the communication portion with the webbing insertion hole 188 in the inner peripheral portion of the through hole 34.

<Operation and Effect of Second Embodiment>
The webbing take-up device 180 according to the present embodiment characterized by the above configuration uses a holder 182 instead of the holder 120 in the first embodiment. However, when the holder 182 is compared with the holder 120, the holder 182 has one more engagement piece 132, so that the shape of the holder 182 along the axial direction of the torsion shaft 50 is the same as the inner peripheral shape of the through hole 34. The holder 182 and the holder 120 basically have the same configuration except that they have the same hexagonal shape. Furthermore, the webbing take-up device 180 has basically the same configuration as the webbing take-up device 10 according to the first embodiment except that the holder 182 is used instead of the holder 120. For this reason, the webbing take-up device 180 basically exhibits the same operation as the webbing take-up device 10 and can obtain the same effect as the webbing take-up device 10.

  In addition, the holder 182 of the webbing take-up device 180 according to the present embodiment has a shape seen along the axial direction of the torsion shaft 50, unlike the holder 120, although the holding piece 122A and the engaging piece 132A are not connected. It becomes the same hexagon as the inner peripheral shape of the through hole 34. In addition, both the holding piece 122A and the engaging piece 132A are in contact with the inner peripheral portion of the through hole 34 at a portion other than the communication portion with the webbing insertion hole 188 in the inner peripheral portion of the through hole 34. Therefore, the holder 182 is not deformed so that the holder 182 opens when the holding piece 122A and the engaging piece 132A are separated from each other, that is, when viewed along the axial direction of the torsion shaft 50.

  For example, when the holder 182 is deformed so that the holder 182 opens at the communication portion between the through hole 34 and the webbing insertion hole 188 when viewed along the axial direction of the torsion shaft 50, the holding piece 122A and the engagement piece Since 132A enters the webbing insertion hole 188, the holding piece 122A and the engagement piece 132A interfere with the base end of the webbing belt 24 when the webbing belt 24 is inserted into the webbing insertion hole 188. For this reason, the workability of inserting the webbing belt 24 into the webbing insertion hole 188 is deteriorated. However, in the webbing take-up device 180 according to the present embodiment, the holder 182 is not deformed so that the holder 182 opens at the communicating portion between the through hole 34 and the webbing insertion hole 188 as described above. The workability of the work of inserting the webbing belt 24 into the hole 188 does not deteriorate.

  In the present embodiment, three holding pieces 122 and three engaging pieces 132 are provided corresponding to each side of the hexagon which is the inner peripheral shape of the tapered portion 38 (through hole 34) of the spool 184. It was the structure to which the provided holder 182 was applied.

  However, for example, even in the configuration using the holder 120 including the three holding pieces 122 and the two engaging pieces 132 in the first embodiment, the inner circumferential direction of the through hole 34 is aligned. The end of the engagement piece 132 located at both ends (that is, the two engagement pieces 132 without the holding piece 122 provided therebetween) opposite to the holding piece 122 (that is, the cross-sectional shape of the holder 120 is a substantially regular hexagonal shape). In this case, the portion where only the side does not exist is not positioned at the communication portion between the webbing insertion hole 188 and the through hole 34, but the portion other than the communication portion with the webbing insertion hole 188 in the inner peripheral portion of the through hole 34. A holder that allows the engagement pieces 132 at both ends to open to each other when the ends of the engagement pieces 132 located at both ends of the part opposite to the holding pieces 122 are brought into contact with the inner peripheral portion of the through hole 34. Prevent or effectively prevent 120 deformation Control can, it is also possible to obtain the same effect as in the holder 182.

<Configuration of Third Embodiment>
Next, a third embodiment of the present invention will be described.

  FIG. 13 is a perspective view showing a rotation restricting means and a holder 212 as a connecting means, which are the main parts of the webbing take-up device 210 according to the present embodiment. As shown in this figure, the holder 212 of the webbing take-up device 210 includes holding pieces 214, 216, and 218 in place of the three pieces 122 including the holding pieces 122A in the second embodiment. . When the holder 212 is viewed along the axial direction of the torsion shaft 50, the holder 212 is a winding direction (a direction indicated by an arrow C in FIG. 14) that is a rotation direction when the spool 220 instead of the spool 20 winds the webbing belt 24. The holding piece 214 is located at the end in the (opposite direction) side, and the engaging piece 132 is connected to the holding piece 214 via the bridge 142 on the drawing direction side opposite to the winding direction.

  A holding piece 216 is connected via a bridge 142 on the opposite side of the engaging piece 132 adjacent to the holding piece 214 from the holding piece 214. Furthermore, the engaging piece 132 is connected to the pulling direction side of the holding piece 216 via a bridge 142, and the holding piece 218 is connected to the opposite side of the engaging piece 132 from the holding piece 216 via the bridge 142. ing. Further, the engagement piece 132A is connected to the drawing direction side of the holding piece 218 via a bridge 142.

  As shown in FIG. 13, the holding piece 214 includes a holding portion 222 that replaces the holding portion 126. Although the holding portion 222 has a flat plate shape, it is not formed in a tapered shape unlike the holding portion 126. When the holding portion 222 is viewed along the thickness direction of the holding portion 222, the holding portion 222 has a substantially rectangular shape. It is said that. The holding portion 222 is bent around an axis whose axial direction is the longitudinal direction of the holding portion 222 (the axial direction of the torsion shaft 50) with the middle portion in the width direction as the center, and the bent portion is an engagement claw. 224.

  On the other hand, the holding piece 216 includes a holding portion 226 that replaces the holding portion 126. The holding portion 226 has a substantially rectangular shape when viewed in the thickness direction, like the holding portion 222. However, the holding portion 226 is not bent unlike the holding portion 222, and therefore the engagement claw 224 is not formed on the holding piece 216.

  The holding piece 218 includes a holding portion 228 that replaces the holding portion 126. The holding portion 228 has a substantially rectangular shape when viewed in the thickness direction, like the holding portion 226. However, unlike the holding portion 226, the holding portion 228 has a notch 230. The notch 230 is formed at a boundary portion between the holding portion 228 and the base portion 124. The cutout portion 230 has a longitudinal direction along the width direction of the holding portion 228, and opens at the width direction end of the holding portion 228 on the winding direction side. The holding portion 228 is an end of the notch portion 230 on the drawing direction side that is not open (that is, the end portion of the notch portion 230 in the intermediate portion in the width direction of the holding portion 228), and the longitudinal direction of the holding portion 228 is the axial direction. The bent portion is an engagement claw 232.

  The above engaging claws 224 and 232 are both bent on the winding direction side with respect to the intermediate portion in the width direction of the holding portions 222 and 228, and the holder 212 excluding the engaging claws 224 and 232 is attached to the torsion shaft. When the shape when viewed along the axial direction of 50 is regarded as a hexagonal shape, the distal ends of the engaging claws 224 and 232 protrude outward from the hexagonal shape.

  The spool body 234 of the spool 220 is formed with an engagement groove 236 corresponding to the engagement claw 224, and the spool body 234 is formed with an engagement groove 238 corresponding to the engagement claw 232. . Each of the engagement grooves 236 and 238 has a substantially triangular cross section. When the cross-sectional shape of each of the engagement grooves 236 and 238 is regarded as a triangular shape, one side of this triangle is opened at the inner peripheral portion of the through hole 34. Further, one of the other two sides of the triangle corresponds to the outer side surface in the thickness direction of each of the engaging claws 224 and 232. Further, the remaining one side of the triangle is a wall portion that faces the front end portions of the engaging claws 224 and the engaging claws 232 on the winding direction side.

<Operation and Effect of Third Embodiment>
The webbing retractor 210 according to the present embodiment having the above-described configuration uses a holder 212 in place of the holder 182 in the second embodiment. However, when the holder 212 is compared with the holder 182, the engaging claws 224 and 232 are formed on the holder 212. However, the holder 212 and the holder 182 basically have the same configuration except that these engagement claws 224 and 232 are formed. Moreover, the webbing take-up device 210 and the webbing take-up device 180 have basically the same configuration except that the holder 212 is used instead of the holder 182. Therefore, the webbing take-up device 210 basically exhibits the same operation as the webbing take-up device 180, and can obtain the same effect as the webbing take-up device 180.

  Also in the webbing take-up device 210, the through hole 34 has a cross-sectional shape and the shape of the holder 212 when the holder 212 is viewed along the axial direction of the torsion shaft 50 is a hexagon (that is, non-circular). is there. Therefore, the holder 212 does not rotate relative to the spool body 234 around the center axis of the spool body 234 of the spool 220.

  Further, in addition to this, in the webbing take-up device 210 according to the present embodiment, as described above, a part of the inner wall of the engagement groove 236 faces the distal end portion of the engagement claw 224 on the take-up direction side. A part of the inner wall of the engagement groove 238 is opposed to the tip end portion of the engagement claw 232 on the winding direction side. Therefore, when the holder 212 does not attempt to follow the spool body 234 when the spool body 234 rotates in the pull-out direction, the portion of the inner wall of the engagement groove 236 that faces the tip of the engagement claw 224 is engaged. The tip of the claw 224 is pressed toward the drawing direction, and the portion of the inner wall of the engaging groove 238 that faces the tip of the engaging claw 232 presses the tip of the engaging claw 232 toward the drawing direction.

  As a result, a delay in rotation of the holder 212 with respect to the spool body 234 in the pull-out direction can be prevented, and as a result, relative rotation of the holder 212 with respect to the spool body 234 can be prevented more reliably.

  In each of the above embodiments, the holding piece 122 and the engaging piece 132 are configured such that the base portion 124 and the base portion 134 are connected by the bridge 142, and the elastic portion 126 and the elastic portion 136 are not directly connected. . However, the held portion 56 of the main shaft 52 and the held portion 86 of the sub-shaft 82 can be inserted, and the claw portion 140 as the engaging portion is held by the insertion of the held portions 56 and 86. As long as it can engage with the parts 56 and 86, the elastic part 126 and the elastic part 136 may be directly connected like the base parts 124 and 134.

It is a front view showing the outline of the whole composition of the webbing winding device concerning a 1st embodiment of the present invention. It is a disassembled perspective view which shows the outline of a structure of the spool of the webbing take-up device according to the first embodiment of the present invention. It is a perspective view of the holder as a connection means and rotation control means of the webbing take-up device according to the first embodiment of the present invention. It is a front view which shows a 1st connection process among the assembly processes of a spool. (A) shows the state just before engagement with an energy absorption member and a connection member, and (A) shows the state just before engagement with an energy absorption member in a 1st connection process, and a state connected with a connection member, B) shows a state where the energy absorbing member is engaged with the connecting member and the elastic portion is deformed, and (C) shows a state where the energy absorbing member and the connecting member are connected. It is a front view which shows a 2nd connection process among the assembly processes of a spool. It is a front view which shows a torsion shaft insertion process among the assembly processes of a spool. It is a front view which shows a fastening process among the assembly processes of a spool. It is front sectional drawing of a spool. It is a perspective view which shows the modification of the holder as a connection means and rotation control means of the webbing take-up device according to the first embodiment of the present invention. It is a perspective view of the holder as a connection means and rotation control means which are the principal parts of the webbing take-up device according to the second embodiment of the present invention. It is sectional drawing of the spool which is the principal part of the webbing winding device concerning a 2nd embodiment of the present invention, and (A) shows the state where the torsion shaft as a webbing belt and energy absorption means was attached to the main part of the spool. (B) shows a state in which the webbing belt and the torsion shaft as the energy absorbing means are not attached to the main body portion of the spool. It is a perspective view of the holder as a connection means and rotation control means which are the principal parts of the webbing take-up device according to the third embodiment of the present invention. It is sectional drawing of the spool which is the principal part of the webbing winding device concerning a 3rd embodiment of the present invention.

Explanation of symbols

10 Webbing take-up device 20 Spool 24 Webbing belt 52 Main shaft (energy absorbing member)
62 First lock mechanism (locking means)
82 Subshaft (energy absorbing member)
110 Second locking mechanism (locking means)
120 holder (rotation restricting means, connecting means)
132 Elastic part 140 Claw part (engagement part)
180 Webbing take-up device 182 Holder (rotation restricting means, connecting means)
184 Spool 210 Webbing take-up device 212 Holder (rotation restricting means, connecting means)
220 spool

Claims (3)

A spool that winds up the webbing belt by locking the longitudinal base end portion of the long belt-shaped webbing belt and rotating in the drawing direction;
A plurality of energy absorbing members housed inside the spool in a state of being aligned along the axial direction of the spool;
The energy absorbing members are connected to and engaged with the energy absorbing members engaged by engaging with the energy absorbing members adjacent along the axial direction, and the energy absorbing members are connected. A connection means for restricting the connection to the energy absorbing member in an engaged state with respect to
Directly or indirectly engaging the plurality of energy absorbing members housed inside the spool, and a fixed end side that is one of both ends of each of the plurality of energy absorbing members is in the spool. Rotation restricting means for restricting relative rotation with respect to,
Among the plurality of energy absorbing members, a first locked state that restricts rotation of the at least one energy absorbing member opposite to the fixed end in the pulling direction, and among the plurality of energy absorbing members, A second lock that restricts rotation of at least one of the energy absorbing members different from the energy absorbing member regulated in the first lock state or the side opposite to the fixed end of all the energy absorbing members in the pull-out direction. Lock means that can be switched between states,
A webbing take-up device comprising: A spool that winds up the webbing belt by locking the longitudinal base end portion of the long belt-shaped webbing belt and rotating in the drawing direction;
A pair of energy absorbing members, each base end side facing the axial center side of the spool is housed inside the spool on the end side rather than the intermediate portion along the axial direction of the spool;
Engaging with each of the pair of energy absorbing members is connected to each of the pair of energy absorbing members to connect one and the other of the pair of energy absorbing members, and in an engaged state with respect to the energy absorbing member A connecting means for restricting the connection to the energy absorbing member;
The base end side of each of the pair of energy absorbing members is restricted from rotating relative to the spool by directly or indirectly engaging the pair of energy absorbing members housed inside the spool. Rotation regulating means to
A first locked state that restricts rotation of one tip side of the pair of energy absorbing members in the pull-out direction; an energy absorbing member that is regulated in the first locked state among the plurality of energy absorbing members; Is a lock means capable of switching to another energy absorbing member or a second lock state that restricts rotation of the leading end side of all the energy absorbing members in the pull-out direction;
A webbing take-up device comprising: Provided corresponding to each of the plurality of energy absorbing members, capable of coming into contact with the energy absorbing member from a direction inclined with respect to a connecting direction when the connecting means is connected to the energy absorbing member, and An elastic part that is elastically deformable in a direction away from the energy absorbing member;
Provided in the elastic portion, with the connecting means attached to the energy absorbing member, engage the energy absorbing member from the mounting direction side and move the connecting means in a direction opposite to the mounting direction. Engagement that can be moved while elastically deforming the elastic portion in a direction away from the energy absorbing member by an external force opposite to the mounting direction and that can be disengaged from the energy absorbing member by this movement. And
The webbing take-up device according to claim 1 or 2, wherein the connecting means is configured including

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