JP2010095058A - Webbing wind-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a webbing wind-up device that can change an energy absorbing amount when the body of a person on board moves inertially toward the front of a vehicle in sudden decelerating of the vehicle, and can set the energy amount to be absorbed relatively freely. <P>SOLUTION: Because a second lock pawl 50 interferes with a wire 94, a rotation of a second lock base 38 in a drawing direction caused by the second lock pawl 50 is not strained until energy absorption by deformation of the wire 94 is completed. Thus, energy absorption by twisting a torsion shaft 26 is performed after the energy absorption by the deformation of the wire 94 is completed. Because the torsion shaft 26 and the wire 94 are arranged so that they are shifted in the radial direction of rotation of a spool 18, a degree of freedom in setting of a length of the torsion shaft 26 is improved, and a degree of freedom in setting the energy absorption by the torsion shaft 26 is increased. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a webbing take-up device that winds and stores a webbing belt constituting a seat belt device of a vehicle.

  As an example, in a webbing take-up device as disclosed in Patent Document 1 below, a torsion shaft is provided inside a spool for taking up a webbing belt. The torsion shaft is connected to the spool at an intermediate portion in the axial direction of the spool. Locking mechanisms are provided on both sides of the spool in the axial direction so as to restrict the rotation of the end of the engaged torsion shaft by directly or indirectly engaging the end of the torsion shaft.

  For example, when the vehicle suddenly decelerates, the end of the torsion shaft is locked to the lock mechanism, and in this state, the occupant's body trying to move inertially toward the front of the vehicle pulls the webbing belt and the spool torque is generated. However, if the mechanical strength of the torsion shaft is exceeded, torsional deformation occurs in the torsion shaft. Since the spool can rotate in the direction of pulling out the webbing belt by the amount of torsional deformation on this torsion shaft, the webbing belt is pulled out from the spool by this allowable rotation amount, and the occupant is pulled by the allowable pull-out length from the spool of this webbing belt. It can move to the front side of the vehicle. Further, as described above, a part of the energy of the force with which the occupant pulls the webbing belt is consumed as energy to be used for torsional deformation of the torsion shaft, and this consumed energy is absorbed.

  Further, in the configuration disclosed in Patent Document 1, driving means such as a solenoid or a gas generator is used to activate the other lock mechanism, and the timing of this driving means is controlled by a control means such as an ECU. One lock mechanism can be operated with a delay relative to the other lock mechanism. For this reason, one of the lock mechanisms is operated, and further, the other lock mechanism is operated after the torsional deformation occurs on the side held by the one lock mechanism above the connecting portion with the spool of the torsion shaft. Then, the torsional deformation is delayed on the other side of the connecting portion with the spool of the torsion shaft. Thereby, the amount of energy absorbed by deformation of the torsion shaft can be increased stepwise.

In addition, a sensor that detects the occupant's physique based on the load acting on the seat is connected to the control means. For example, when the occupant is relatively small, the driving means is not driven based on a signal from the sensor. Thus, the control means controls so that the torsional deformation can be prevented from occurring on the other side of the connecting portion of the torsion shaft with the spool. Thereby, when a passenger | crew is small, the energy absorption amount by a torsion shaft does not increase in steps.
US Patent No. 5,799,893

  By the way, in this webbing take-up device, the torsion shaft is connected to the spool at an intermediate portion in the axial direction of the spool, and one end side of the torsion shaft is locked by one locking mechanism with respect to the spool connecting portion. The other end side of the connecting portion is locked to the other locking mechanism. In such a configuration, if one end side is set sufficiently longer than the connection portion with the spool of the torsion shaft, the other end side must be set shorter than the connection portion with the spool of the torsion shaft. There are many restrictions on the setting of the length on one end side of the connecting portion with the spool and the length on the other end side of the connecting portion with the spool of the torsion shaft, and it is difficult to set the amount of energy absorbed by both.

  The present invention provides a webbing take-up device that can change the amount of energy absorbed when the occupant's body inertially moves toward the front of the vehicle during sudden deceleration of the vehicle, and that can relatively freely set the amount of energy to be absorbed. The purpose is to obtain.

  In the webbing retractor according to the first aspect of the present invention, a first insertion hole opened at an axial end is formed, and a rotational radial direction or a rotational circumferential direction is formed with respect to the first insertion hole. A second insertion hole formed at the displaced position and opened at the end in the axial direction is formed, and further, the longitudinal base end side of the long belt-like webbing belt is locked, and the winding is one of the windings around the axis. A spool that winds and stores the webbing belt from the base end side in the longitudinal direction by rotation in a direction, and a part of the spool is provided inside the first insertion hole. The side provided in the first energy absorbing means that is not rotatable relative to the spool, and a part of the first energy absorbing means that enters the inside of the second insertion hole is provided in the spool. The side provided inside the spool A second energy absorbing means that is relatively incapable of rotation, and a first lock member provided on one end side in the axial direction of the spool, and the vehicle suddenly decelerates and the spool suddenly rotates in the pull-out direction. The first lock member is engaged with either one of the first energy absorbing means and the second energy absorbing means, and the first lock member of the one energy absorbing means is operated. A first locking means for restricting rotation of the engaging portion with the spool; and provided on one side or the other end of the spool in the axial direction, the first energy absorbing means and the second energy absorbing means. A second locking member biased in an engagement direction with respect to any one of the energy absorbing means, and the second energy absorbing means includes the second locking member; A second locking means for restricting rotation of the engagement portion of the other energy absorbing means with the second locking member by the engagement of the locking member, and the second locking; The second lock member is restricted from moving in a direction to interfere with any one of the other energy absorbing means and the first lock member is engaged with any one of the energy absorbing means. Interference means for releasing interference with the second lock means in conjunction with rotation of the spool at a predetermined angle in the pull-out direction in the state.

  In the webbing take-up device according to the first aspect of the present invention, at least in a vehicle suddenly decelerated state and a state where the spool is suddenly rotated in the pull-out direction due to the webbing belt attached to the occupant's body being pulled abruptly. When either state is reached, the first locking means is activated. When the first locking means is actuated, the first locking member is engaged with one of the first energy absorbing means and the second energy absorbing means.

  The first energy absorbing means is partially inserted into the first insertion hole formed in the spool, and a part of the first energy absorbing means that has entered the first insertion hole is not rotatable relative to the spool. Has been. The second energy absorbing means partially enters the second insertion hole formed in the spool, and a part of the second energy absorbing means that has entered the second insertion hole rotates relative to the spool. It is considered impossible. For this reason, both the first energy absorbing means and the second energy absorbing means rotate together with the spool. However, when the first lock member is engaged with any one of the energy absorbing means, any one of the above-mentioned ones accompanying the spool. The rotation of the energy absorbing means is restricted by the first lock member.

  In this state, when the rotational force of the spool in the pull-out direction exceeds the mechanical strength of any one of the energy absorbing means, the spool is engaged with the engagement portion of the any one of the energy absorbing means with the first lock member. Rotates in the pull-out direction. By the rotation of the spool relative to the first lock member, the first energy absorbing means is deformed in accordance with the rotation amount in the pull-out direction of the spool.

  The webbing belt is pulled out from the spool by the amount of rotation in the pulling-out direction of the spool that is allowed in a state where the first lock member restricts the rotation of any one of the energy absorbing means, and the length of the pulled-out webbing belt. However, the body of the occupant wearing this webbing belt can move to the front side of the vehicle due to, for example, inertia in the vehicle sudden deceleration state, and only the amount of energy provided for the deformation of one of the energy absorbing means. The kinetic energy of the occupant's body trying to move inertially toward the vehicle front side is absorbed.

  Next, in this way, in a state where the rotation of any one of the energy absorbing means is restricted by the first locking means, the engagement portion of the first locking member with any one of the energy absorbing means When the spool rotates in the pull-out direction, the interference means interlocks with the rotation of the spool. Further, when the spool rotates more than a predetermined angle in this state, the interference of the interference means with the second lock member of the second lock means is eliminated. .

  When the interference by the interference means is eliminated, the second lock member moves in a direction to engage either one of the first energy absorption means and the second energy absorption means. When the second lock member moves in this way and the second lock member engages with the other energy absorbing means, the engagement portion of the any one of the other energy absorbing means with the second lock member becomes the first. 2 Rotation is restricted by the lock member.

  If the deformation of any one of the energy absorbing means is completed in this state, the rotational force in the pulling-out direction of the spool exceeds the sum of the mechanical strength of the other energy absorbing means. Then, the other energy absorbing means is deformed.

  As a result, the webbing belt is pulled out from the spool by an amount of rotation in the pulling-out direction of the spool that is allowed in a state where the second lock member restricts the rotation of either of the other energy absorbing means. The body of the occupant wearing the webbing belt can be moved to the front side of the vehicle by, for example, inertia in the vehicle sudden deceleration state, and used for deformation of one of the other energy absorbing means. The kinetic energy of the occupant's body trying to move inertially toward the vehicle front side is absorbed by the energy.

  On the other hand, when the rotation of any one of the other energy absorbing means is restricted by the second lock member, if any one of the energy absorbing means is in the middle of deformation, the rotational force in the spool pull-out direction Is greater than the sum of the mechanical strength of the first energy absorbing means and the mechanical strength of the second energy absorbing means, both the first energy absorbing means and the second energy absorbing means are deformed.

  As a result, the first lock member regulates the rotation of any one of the energy absorbing means, and further allows the spool to be pulled out while the second lock member restricts the rotation of any one of the other energy absorbing means. The webbing belt is pulled out from the spool by the amount of rotation in the direction, and the body of the occupant wearing this webbing belt by the length of the pulled-out webbing belt, for example, due to inertia in the vehicle sudden deceleration state The kinetic energy of the occupant's body trying to move inertially toward the front side of the vehicle can be absorbed by the amount of energy that can move forward and that is used for deformation of both the first and second energy absorbing means.

  As described above, in the webbing take-up device according to the present invention, of the first energy absorbing means and the second energy absorbing means, the deformation of the other energy absorbing means is the first locking member being either one of the above. The process is started after the spool has been rotated by a predetermined angle or more in the pull-out direction while being engaged with the energy absorbing means.

  Since the spool is rotated in the pull-out direction with the first lock member engaged with either one of the energy absorbing means, the one of the energy absorbing means is deformed. The deformation starts later than the deformation of any one of the energy absorbing means. For this reason, since the energy absorption due to the deformation of one of the other energy absorption means is superimposed after the energy absorption due to the deformation of one of the energy absorption means is started, the occupant's body moves to the front side of the vehicle. It is possible to increase (change) the amount of absorbed kinetic energy during the absorption process.

  In addition, the first energy absorbing means is provided in the spool in a state where a part of the first energy absorbing means enters the first insertion hole, whereas the second energy absorbing means has a rotation radius of the spool with respect to the first insertion hole. The spool is provided in a state of entering a second insertion hole formed at a position displaced in the direction or the rotational circumferential direction.

  Thus, the first energy absorbing means and the second energy absorbing means are provided in a state shifted in the rotational radius direction or the rotational circumferential direction of the spool, so that the first energy absorbing means and the second energy absorbing means are The length of each of the first energy absorbing means and the second energy absorbing means along the central axis of the spool can be increased as compared with the configuration provided side by side in the spool axial direction. Thereby, the freedom degree of setting of the magnitude | size etc. of the energy to absorb based on each mechanical strength of a 1st energy absorption means and a 2nd energy absorption means improves.

  A webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the webbing retractor is inserted into the spool while interfering with the second locking member, and the first locking means is operated. Thus, the spool is pulled out from the spool in accordance with the amount of rotation of the spool in the pull-out direction when the first lock unit is operated and the first lock unit is activated. The interference means is configured to include an interference member that eliminates interference with the second lock member by pulling out.

  In the webbing retractor according to the second aspect of the present invention, the interference member constituting the interference means is inserted through the spool in a state of interfering with the second lock member of the second lock means. When the first locking means is activated, the interference member is held by the first locking means. When the spool rotates in the pull-out direction in this state, the interference member is pulled out from the spool. The interference member is pulled out from the spool beyond a certain amount, so that the interference with the second lock member is eliminated, and the interference of the second lock member by the interference member is eliminated, so that the first energy absorption means and the second energy absorption are eliminated. One of the means is engaged with the other (ie, the first locking member is not engaged).

  Here, in the webbing take-up device according to the present invention, when the interference member is pulled out from the spool beyond a certain amount, the interference of the interference member with the second lock member is eliminated. For this reason, the timing until the interference member cancels the interference with the second lock member can be set according to the amount until the interference with the second lock member is canceled.

  The webbing take-up device according to a third aspect of the present invention is the webbing retractor according to the second aspect of the present invention, wherein the first locking device is disposed on a side opposite to the spool of the second locking means along the axial direction of the spool. Locking means are provided.

  In the webbing retractor according to the third aspect of the present invention, the first locking means is provided on the opposite side of the spool of the second locking means along the axial direction of the spool. For this reason, when the interference member of the interference means inserted through the spool is provided so that it can be held by the first lock means, it is easy to provide the interference member so as to pass through the second lock means. The interference member can be easily disposed at a position where the second lock member interferes with the second lock member.

  As described above, in the webbing retractor according to the present invention, the amount of energy absorbed when the occupant's body inertially moves toward the front of the vehicle during sudden deceleration of the vehicle can be changed. Can be set relatively freely.

<Configuration of First Embodiment>
FIG. 1 is a front sectional view showing an outline of the configuration of a webbing take-up device 10 according to a first embodiment of the present invention. As shown in this figure, the webbing retractor 10 includes a frame 12 that is fastened and fixed to a predetermined portion of the vehicle body. The frame 12 includes a pair of leg plates 14 and 16. Each of the leg plates 14 and 16 is formed in a flat plate shape, and is opposed to each other in the thickness direction thereof. A spool 18 is disposed between the leg plate 14 and the leg plate 16. The spool 18 is formed in a substantially cylindrical shape whose axial direction is along the opposing direction of the leg plate 14 and the leg plate 16, and is rotatable around its own central axis.

  A longitudinal end portion of the long belt-like webbing belt 20 is locked to the spool 18. When the spool 18 rotates in the winding direction (in the direction of arrow A in each figure), which is one side around its own central axis, the webbing belt 20 is wound in layers from the base end side in the longitudinal direction to the outer peripheral portion. When the webbing belt 20 is pulled toward the tip, the webbing belt 20 wound around the spool 18 is pulled out, and the spool 18 rotates in the pulling direction opposite to the winding direction (arrow B direction in each figure).

  A first insertion hole 22 is formed in the spool 18. The first insertion hole 22 is formed along the central axis of the spool 18 at the center in the rotational radius direction of the spool 18, and both ends of the first insertion hole 22 along the axial direction of the spool 18 are both end portions in the axial direction of the spool 18. Open at. On the side of the leg plate 16 with respect to the intermediate portion of the first insertion hole 22 along the axial direction of the spool 18, the opening shape of the first insertion hole 22 is a non-circular shape such as a polygon or a star. An adapter 24 is inserted from the opening end of the first insertion hole 22 on the leg plate 16 side. The outer peripheral shape of the portion inserted into the first insertion hole 22 of the adapter 24 is a non-circular shape corresponding to the inner peripheral shape of the first insertion hole 22 on the leg plate 16 side. The adapter 24 fitted in the hole 22 is not rotatable relative to the spool 18.

  In addition, a torsion shaft 26 as a first energy absorbing means is provided inside the first insertion hole 22. The torsion shaft 26 has a long bar shape along the central axis of the connecting portion 28, and the connecting portion 28 is formed at the end on the leg plate 16 side. Corresponding to the connecting portion 28, the adapter 24 is formed with a fitting insertion hole 30 that opens toward the leg plate 14 along the axial direction of the spool 18, and the connecting portion 28 is inserted into the fitting insertion hole 30. Has been. The outer peripheral shape of the connecting portion 28 is a non-circular shape such as a polygon or a star, and the inner peripheral shape of the fitting insertion hole 30 is a non-circular shape into which the connecting portion 28 can be inserted.

  For this reason, the connecting portion 28 (that is, the torsion shaft 26) cannot rotate relative to the adapter 24, and as a result, cannot rotate relative to the spool 18. Further, a shaft portion 32 is formed so as to protrude coaxially with respect to the main body portion of the torsion shaft 26 from the end surface of the connecting portion 28 opposite to the leg plate 14. The shaft portion 32 penetrates through the adapter 24, and by extension, the leg plate 16, and protrudes to the outside of the leg plate 16 (on the side opposite to the leg plate 14 of the leg plate 16).

  A spring case 34 is attached to the leg plate 16 on the outer side of the leg plate 16 (on the opposite side of the leg plate 16 from the leg plate 14). The shaft portion 32 enters the spring case 34, and the tip of the spring case 34 rotates to the spring case 34. It is supported freely. A spiral spring 36 serving as a spool urging means is accommodated inside the spring case 34. The end of the spiral spring 36 on the outer side in the spiral direction is locked directly or indirectly to the spring case 34.

  In contrast, the end of the spiral spring 36 on the inner side in the spiral direction is directly or indirectly locked to the shaft portion 32, and the shaft portion 32 (that is, the spool 18 indirectly by the torsion shaft 26) is taken up by the winding described above. When rotating in the pulling direction opposite to the direction, the spiral spring 36 is wound up, and the shaft portion 32 (that is, the spool 18 indirectly by the torsion shaft 26) is biased in the winding direction. For this reason, when the webbing belt 20 is pulled out from the spool 18 and rotates in the pulling direction, the urging force of the spiral spring 36 generated thereby urges the spool 18 in the winding direction, and the webbing is applied to the spool 18 by this urging force. The belt 20 can be wound up.

  On the other hand, a second lock base 38 constituting second lock means is provided on the side of the leg plate 14 of the spool 18. The second lock base 38 includes a fitting insertion portion 40 having a circular outer peripheral shape. Corresponding to the fitting insertion portion 40, the opening shape of the first insertion hole 22 is a coaxial circle with respect to the spool 18 on the side of the leg plate 14 from the intermediate portion in the axial direction of the spool 18, and the fitting insertion portion 40 has a first insertion shape. The hole 22 is inserted into the spool 18 so as to be rotatable relative to the spool 18 from the opening end on the leg plate 14 side.

  A fitting insertion hole 42 opened toward the leg plate 16 side is formed in the fitting insertion portion 40, and a connecting portion 44 formed at an end portion of the torsion shaft 26 on the leg plate 14 side is fitted into the fitting insertion hole 42. Has been. The outer peripheral shape of the connecting portion 44 is a non-circular shape such as a polygon or a star, and the inner peripheral shape of the fitting insertion hole 42 is a non-circular shape into which the connecting portion 44 can be inserted. For this reason, the connecting portion 44 (that is, the torsion shaft 26) is not rotatable relative to the adapter 24, and as a result, is not rotatable relative to the spool 18.

  A second lock base main body 46 is integrally formed with the insertion portion 40 on the opposite side of the insertion portion 40 from the leg plate 16. The second lock base main body 46 is formed with a pawl housing portion 48 opened at a part of the outer periphery, and a second lock pawl 50 as a second lock member is housed inside the pawl housing portion 48. As shown in FIG. 2, a pawl support shaft 52 is formed in the pawl housing portion 48 with the same direction as the axial direction of the spool 18 in the pawl housing portion 48, and the second lock pawl 50 is supported by the pawl. A pawl support shaft 52 is supported so as to be rotatable around the shaft 52.

  The second lock base body 46 is provided with a pawl biasing spring 54 as a second lock member biasing means. The pawl biasing spring 54 is a torsion coil spring, and one end thereof is locked to the second lock base body 46. Further, the other end of the pawl biasing spring 54 is engaged with the second lock pawl 50, and the tip end side of the second lock pawl 50 is located around the pawl support shaft 52 in the outer periphery of the second lock base main body 46. The second lock pawl 50 is biased in a direction protruding from the open end.

  Further, a ratchet portion 56 composed of external ratchet teeth is formed at the tip of the second lock pawl 50 around the pawl support shaft 52 in the rotational radial direction of the second lock pawl 50, and a pawl biasing spring is formed. When the second lock pawl 50 is rotated by the urging force 54, the ratchet portion 56 protrudes to the outside of the second lock base main body 46 from the opening of the pawl housing portion 48 in the outer peripheral portion of the second lock base main body 46.

  Further, as shown in FIG. 1, a support portion 58 is formed on the opposite side of the second lock base body 46 from the fitting insertion portion 40. The support portion 58 is formed in a cylindrical shape that is coaxial with the spool 18, and on the inner side thereof, the support portion 58 is formed so as to protrude coaxially with respect to the main body portion of the torsion shaft 26 from the end surface opposite to the leg plate 16. The shaft portion 60 is passed. Further, a first lock base 64 constituting a first lock mechanism 62 as a first lock means is rotatably supported by the support portion 58.

  As shown in FIG. 4, the first lock base 64 is formed with a pawl housing portion 66 opened at a part of the outer periphery of the first lock base 64, and a first lock as a first lock member is formed on the inside thereof. A pawl 68 is housed. The first lock pawl 68 is supported by the shaft portion 60 so as to be able to follow and rotate with respect to the pawl housing portion 66 on the opposite side of the first lock base 64 to the second lock base 38, for example. A rotating body (not shown) constituting the first lock mechanism 62 is engaged with 64, and the rotating body does not follow the rotation of the first lock base 64 in the pull-out direction and is relative to the first lock base 64. When rotated, the rotating body moves the first lock pawl 68 so that the front end side of the first lock pawl 68 protrudes from the opening of the pawl housing portion 66 in a part of the outer periphery of the first lock base 64 to the outside of the first lock base 64. Let

  A ratchet portion 70 similar to the ratchet portion 56 formed on the second lock pawl 50 is formed at the tip end portion of the first lock pawl 68, and the first lock base 64 relative to the rotating body is relative to the pull-out direction. When the first lock pawl 68 moves along with the rotating body by the rotation, the ratchet portion 70 protrudes outside the first lock pawl 68 from the opening of the pawl housing portion 66 in the outer peripheral portion of the first lock pawl 68.

  Further, the first lock mechanism 62 is configured so that each component constituting the so-called “VSIR mechanism” that restricts the rotation of the rotating body in the pulling-out direction in the vehicle sudden deceleration state, and the shaft portion 60 are rapidly rotated in the pulling-out direction. At this time, each component that constitutes a so-called “WSIR mechanism” that restricts the rotation of the rotating body in the pulling-out direction is provided, and these components are outside the leg plate 14 (on the side opposite to the leg plate 16 of the leg plate 14). ) In a housing 72 provided on the leg plate 14.

  On the other hand, a ratchet cylinder 74 is integrally formed on the leg plate 14 corresponding to the ratchet portion 56 formed on the second lock pawl 50 and the ratchet portion 70 formed on the first lock pawl 68. The ratchet cylinder 74 is formed in a cylindrical shape coaxial with the spool 18, and the second lock base main body 46 and the first lock base 64 of the second lock base 38 are located inside the ratchet cylinder 74 with respect to the ratchet cylinder 74. Are arranged coaxially.

  A ratchet portion 76 that can engage with both the ratchet portion 56 of the second lock pawl 50 and the ratchet portion 70 of the first lock pawl 68 is formed on the inner peripheral portion of the ratchet cylinder 74, as shown in FIG. When the ratchet portion 56 of the second lock pawl 50 meshes with the ratchet portion 76 of the ratchet cylinder 74, the rotation of the second lock base 38 in the pull-out direction is restricted, and as shown in FIG. When the ratchet part 70 meshes with the ratchet part 76 of the ratchet cylinder 74, the rotation of the first lock pawl 68 in the pull-out direction is restricted.

  On the other hand, as shown in FIG. 1, a second insertion hole 92 is formed in the spool 18 outside the first insertion hole 22 in the rotational radial direction of the spool 18. The second insertion hole 92 is opened at least at the end of the spool 18 on the leg plate 14 side. In the webbing take-up device 10, the second insertion hole 92 is opened at both axial ends of the spool 18. The opening direction of the second insertion hole 92 is the same as the axial direction of the spool 18, and the wire main body 96 of the wire 94 serving as both the second energy absorbing means and the regulating means is inserted inside the second insertion hole 92.

  The wire body 96 is formed in a rod shape that is elongated along the direction of penetration of the second insertion hole 92. The leg plate 14 side of the wire body 96 protrudes outside the spool 18 from the open end of the second insertion hole 92 on the leg plate 14 side. A through hole 98 is formed in the second lock base main body 46 of the second lock base 38 corresponding to the second insertion hole 92 protruding from the spool 18 in this way. The through hole 98 has an inner circumferential shape slightly larger than the outer circumferential shape of the wire body 96, and one end is opened at the end surface of the second lock base body 46 on the leg plate 16 side along the axial direction of the spool 18.

  On the other hand, the other end of the through hole 98 is opened at the bottom surface of the pawl housing portion 48 (the surface facing the first lock base 64 of the pawl housing portion 48). Further, as shown in FIG. 2, the other end of the through hole 98 is connected to the pawl housing portion without the second lock pawl 50 projecting from the opening of the pawl housing portion 48 in a part of the outer periphery of the second lock base body 46. The second lock pawl 50 is opened to the side of the side surface of the second lock pawl 50 on the biasing direction side by the pawl biasing spring 54 in the state of being accommodated in 48. The wire main body 96 protruding from the opening end of the second insertion hole 92 on the leg plate 14 side passes through the through hole 98 and enters the pawl housing portion 48, and the second lock pawl 50 biased by the pawl biasing spring 54. And the second lock pawl 50 is restricted from rotating.

  As shown in FIG. 6, the curved portion 100 is continuously formed from the end portion on the first lock base 64 side of the wire body 96 that has passed through the second insertion hole 92. As shown in FIGS. 1 and 7, a guide groove 102 is formed in the first lock base 64 corresponding to the curved portion 100.

  As shown in FIG. 7, the guide groove 102 is coaxially curved with respect to the spool 18, and opens at the end surface of the first lock base 64 facing the second lock base main body 46. The opening width dimension of the guide groove 102 is slightly larger than the outer diameter dimension of the second insertion hole 92 in the curved portion 100, and the curved portion 100 is bent from the end of the wire body 96 toward the rotational circumferential direction of the spool 18. In addition, the bending portion 100 is bent following the guide groove 102 and is accommodated inside the guide groove 102.

  A head portion 104 is formed continuously from the end of the bending portion 100 opposite to the wire body 96. A holding hole 106 is formed in the first lock base 64 corresponding to the head 104. The holding hole 106 is opened at the bottom of the guide groove 102, and the head 104 enters the holding hole 106 so that the head 104 does not come out from the holding hole 106 toward the guide groove 102.

  As described above, the first lock base 64 is rotatably supported by the support portion 58 of the second lock base 38, but the wire body 96 of the wire 94 is inserted into the second insertion hole 92 of the spool 18, and the wire Since the head portion 104 of 94 is inserted into the holding hole 106 so as not to come out of the holding hole 106 of the first lock base 64, the first lock base is used unless the wire body 96 is pulled out from the second insertion hole 92. 64 rotates together with the spool 18.

<Operation and Effect of First Embodiment>
Next, the operation and effect of the present embodiment will be described through the operation of the webbing take-up device 10.

  In the webbing take-up device 10, when the occupant seated in the vehicle seat pulls out the webbing belt 20 wound up on the spool 18 and attaches to the body, the first lock is applied. The “VSIR mechanism” constituting the mechanism 62 is activated, and the rotation of the rotating body supported by the shaft portion 60 so as to be able to follow and rotate with respect to the first lock base 64 is rotated in the pull-out direction of the first lock mechanism 62. "Mechanism" regulates.

  On the other hand, when the vehicle suddenly decelerates, the occupant attempts to move inertially toward the front of the vehicle. As a result, the occupant's body pulls the webbing belt 20 abruptly, causing the spool 18 and thus the torsion shaft 26 to suddenly move. When rotating in the pull-out direction, the “WSIR mechanism” constituting the first lock mechanism 62 operates, and the “WSIR mechanism” of the first lock mechanism 62 regulates the rotation of the rotating body in the pull-out direction.

  In this manner, in the state where the rotation of the rotating body in the pulling-out direction is restricted, the occupant's body trying to move inertially toward the front side of the vehicle pulls the webbing belt 20, whereby the spool 18 and thus the first When the lock base 64 rotates in the pull-out direction, a relative rotation occurs between the rotating body and the first lock base 64, and the first lock pawl 68 interlocks with the relative rotation and a part of the outer periphery of the first lock base 64 The first lock pawl 68 moves so that the tip of the first lock pawl 68 protrudes from the opening of the pawl housing portion 66.

  Thus, when the first lock pawl 68 moves, the ratchet portion 70 formed at the tip of the first lock pawl 68 approaches the ratchet portion 76 formed at the inner peripheral portion of the ratchet tube 74, and the ratchet tube 74. The ratchet portion 76 of the first lock pawl 68 is engaged with the ratchet portion 76. As a result, the rotation of the first lock base 64 in the pull-out direction is restricted.

  As described above, since the first lock base 64 cannot be rotated relative to the spool 18 by the wire 94, the rotation of the first lock base 64 in the pull-out direction is restricted so that the spool 18 can be pulled out. Rotation in the direction is restricted, whereby the withdrawal of the webbing belt 20 from the spool 18 is restricted. In this way, by restricting the pulling of the webbing belt 20 from the spool 18, the body of the occupant trying to move inertially toward the front side of the vehicle is strongly held by the webbing belt 20.

  In this state, if the rotational force in the pull-out direction of the spool 18 caused by the occupant's body pulling the webbing belt 20 exceeds the mechanical strength of the wire 94, the rotation in the pull-out direction is restricted. The spool 18 rotates in the pull-out direction with respect to the one lock base 64, and the wire main body 96 of the wire 94 is pulled out from the end of the second insertion hole 92 on the leg plate 14 side in conjunction with this rotation. The wire body 96 pulled out in this way is squeezed at the edge of the second lock base body 46 on the first lock base 64 side, bent in the rotational radius direction of the spool 18, and further curved in the guide groove 102. The inside of the guide groove 102 is bent while following the above.

  Thus, the spool 18 rotates in the pull-out direction by the amount that can be pulled out from the second insertion hole 92 and deformed following the guide groove 102, and the webbing belt 20 is pulled out from the spool 18 by the amount of rotation of the spool 18. The occupant's body can move to the front side of the vehicle by the length of the webbing belt 20 drawn from the spool 18. Further, a part of the energy that the occupant pulls the webbing belt 20 (that is, the kinetic energy of the occupant's body trying to move inertially toward the vehicle front side) is part of the above-described deformation of the wire main body 96 drawn from the second insertion hole 92. (That is, a part of the kinetic energy of the occupant's body is absorbed by the deformation of the wire body 96).

  Next, when the rotation of the spool 18 in the pull-out direction with respect to the first lock base 64 continues, the wire body 96 is pulled out from the second insertion hole 92 by a length corresponding to the rotation amount of the spool 18, and further, the second insertion hole When the wire main body 96 is all pulled out from 92 and accommodated in the guide groove 102, the interference of the wire main body 96 with respect to the second lock pawl 50 is eliminated.

  When the interference of the wire main body 96 with respect to the second lock pawl 50 is resolved, the second lock pawl 50 rotates around the pawl support shaft 52 by the biasing force of the pawl biasing spring 54, and the ratchet portion 56 formed at the tip thereof. Approaches the ratchet portion 76 of the ratchet cylinder 74. Accordingly, when the ratchet portion 56 of the second lock pawl 50 is engaged with the ratchet portion 76 of the ratchet cylinder 74, the rotation of the second lock base 38 in the pull-out direction is restricted.

  Here, for example, the rotational force of the spool 18 in the pull-out direction generated when the occupant wearing the webbing belt 20 is relatively small and the occupant's body pulls the webbing belt 20 causes the mechanical force of the torsion shaft 26. If it does not exceed the strength, in this state, the rotation of the spool 18 in the pull-out direction is restricted again, and the movement of the occupant's body toward the vehicle front side is restricted by the webbing belt 20.

  On the other hand, for example, the occupant wearing the webbing belt 20 is relatively large, and the rotational force of the spool 18 in the pull-out direction generated when the occupant's body pulls the webbing belt 20 causes the machine of the torsion shaft 26 to move. If the strength exceeds the mechanical strength, the spool 18 rotates in the pull-out direction with respect to the second lock base 38 whose rotation in the pull-out direction is restricted, whereby the torsion shaft is connected between the connecting portion 28 and the connecting portion 44. Deformation occurs in the torsion shaft 26 so that it is twisted.

  The spool 18 rotates in the pull-out direction by the torsional deformation of the torsion shaft 26, and the webbing belt 20 is pulled out from the spool 18 by the rotation of the spool 18, and the length of the webbing belt 20 pulled out from the spool 18. The occupant's body can move toward the front of the vehicle by that amount. Further, a part of the energy that the occupant pulls the webbing belt 20 (that is, the kinetic energy of the occupant's body trying to move inertially toward the front of the vehicle) is subjected to deformation of the torsion shaft 26 (that is, the occupant's body's body). Part of the kinetic energy is absorbed by the deformation of the torsion shaft 26).

  Thus, in the present webbing retractor 10, the deformation of the torsion shaft 26 occurs after the end of the deformation of the wire main body 96 (wire 94) (that is, after the start of the deformation of the wire main body 96). The amount of energy absorbed between the start of the deformation 96 and the end of the deformation of the torsion shaft 26 can be changed.

  Moreover, in the present webbing take-up device 10, the member to be deformed is changed from the wire main body 96 to the torsion shaft 26 when the energy amount to be absorbed is changed in the absorption process. Here, the torsion shaft 26 is provided in the first insertion hole 22 of the spool 18, whereas the wire body 96 of the second insertion hole 92 is formed on the outer side in the rotational radius direction than the first insertion hole 22. Two insertion holes 92 are provided.

  For this reason, each of the torsion shaft 26 and the wire main body 96 can be set sufficiently long in the axial direction of the spool 18, whereby the rotational force necessary for the deformation of the torsion shaft 26, that is, the energy absorbed by the deformation of the torsion shaft 26. The amount of energy absorbed by the deformation of the torsion shaft 26 and the time length from the start to the end of the deformation can be set relatively freely, for example, by increasing the amount.

  Further, the ratchet portion 56 of the second lock pawl 50 cannot be engaged with the ratchet portion 76 of the ratchet cylinder 74 until all the wire main body 96 comes out of the second insertion hole 92. Therefore, the timing from when the deformation of the wire body 96 is started until the deformation of the torsion shaft 26 is started can be easily set by the length of insertion of the wire body 96 into the second insertion hole 92.

<Configuration of Second Embodiment>
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same reference numerals are given to the same parts as those in the first embodiment, and the detailed description thereof is omitted.

  FIG. 8 is a front sectional view schematically showing the configuration of the webbing take-up device 130 according to the present embodiment. As shown in this figure, the webbing retractor 130 does not include the first lock mechanism 62 but includes the first lock mechanism 132 instead. The first lock mechanism 132 includes a first lock base 134. The first lock base 134 includes a fitting insertion portion 136 and a first lock base main body 138 corresponding to the fitting insertion portion 40 and the second lock base main body 46 of the second lock base 38 in the first embodiment. . An insertion hole 42 is formed in the insertion portion 136 in the same manner as the insertion portion 40 of the second lock base 38, and the connecting portion 44 of the torsion shaft 26 is inserted.

  On the other hand, the shaft portion 60 is formed from the first lock base body 138 in the same manner as the second lock base body 46, but the pawl housing portion 48 is not formed in the first lock base body 138, and Like the first lock base 64 in the first embodiment, a pawl housing portion 66 in which the first lock pawl 68 is housed is formed inside. The first lock mechanism 132 including the first lock base 134 includes “VSIR mechanism” and “WSIR mechanism” in the same manner as the first lock mechanism 62 in the first embodiment. Components are provided, and each of these components is accommodated in a housing 72 provided on the leg plate 14 as in the first embodiment.

  Further, in the present embodiment, the ratchet cylinder 74 is not formed on the leg plate 14, and instead, a ratchet hole 140 penetrating the leg plate 14 is formed. The ratchet hole 140 is formed with internal ratchet teeth similar to the inner peripheral portion of the ratchet cylinder 74, and the ratchet portion 70 of the first lock pawl 68 is engaged with the ratchet teeth of the ratchet hole 140 so that the first ratchet teeth 140 are engaged. The rotation of the lock base 134 in the pull-out direction is restricted.

  On the other hand, the webbing take-up device 130 does not include the adapter 24 but instead includes a second lock base 142 serving as second locking means. The second lock base 142 includes a fitting insertion portion 145 corresponding to the fitting insertion portion 40 of the second lock base 38 in the first embodiment. The fitting insertion portion 145 has a circular outer periphery like the fitting insertion portion 40, and is fitted into the spool 18 so as to be rotatable relative to the opening end on the leg plate 16 side of the spool 18. However, unlike the insertion portion 40, the insertion portion 145 is not formed with the insertion hole 42 into which the connecting portion 28 can be inserted, and the shaft portion 32 can pass through the second lock base 142. A penetrating through hole is formed, and is supported by the shaft portion 32 so as to be rotatable around the shaft portion 32.

  Thus, since the insertion hole 42 into which the connection part 28 can be inserted is not formed in the insertion part 145, the connection part 28 is connected to the leg plate 14 of the insertion part 145 as shown in FIG. It is connected to the spool 18 in a state in which it cannot rotate relative to the spool 18 on the side.

  The second lock base 142 includes a second lock base main body 144 that replaces the second lock base main body 46. As shown in FIG. 9, the second lock base main body 144 is formed with a pawl accommodating portion 48 that accommodates the second lock pawl 50, so that the second lock base 38 in the first embodiment is the second lock base 38. It is the same as the lock base body 46. In the webbing retractor 10, a ratchet hole 146 is formed in the leg plate 16 corresponding to the second lock pawl 50 provided in the second lock base body 144. The ratchet hole 146 of the leg plate 16 is an internal ratchet tooth similar to the ratchet hole 140 of the leg plate 14, and as shown in FIG. 2 The rotation of the lock base 142 in the pull-out direction is restricted.

  On the other hand, unlike the second lock base body 46 of the second lock base 38, a guide groove 148 is formed in the second lock base body 144 of the second lock base 142. The guide groove 148 is a bottomed groove opened on the surface of the second lock base body 144 facing the spool 18, and as shown in FIG. 11, the first lock base 64 in the first embodiment is used. In addition, like the guide groove 102 formed in the first lock base body 138 of the first lock base 134 in the present embodiment, it is curved around the central axis of the spool 18.

  Further, as shown in FIG. 11, the second lock base main body 144 includes the first lock base 64 of the first embodiment and the first lock base main body of the first lock base 134 of the present embodiment. A holding hole 150 is formed in the same manner as the holding hole 106 formed in 138. In the present embodiment, the wire 94 has a curved portion 100 formed at the end of the wire body 96 on the leg plate 16 side, and a guide groove is formed. Further, the head 104 of the second insertion hole 92 enters the holding hole 150 so that the head 104 does not come out to the spool 18 side.

  On the other hand, in the webbing retractor 130, a third insertion hole 152 is formed in the spool 18 in addition to the second insertion hole 92. The third insertion holes 152 are open at both axial ends of the spool 18, and the opening direction is the same as the axial direction of the spool 18. An interference wire 154 as an interference means is accommodated inside the third insertion hole 152. One end side of the interference wire 154 protrudes from the opening end of the third insertion hole 152 on the leg plate 14 side and enters the guide groove 102. Furthermore, one end side of the interference wire 154 that has entered the guide groove 102 enters the holding hole 106 and is held so as not to come out of the holding hole 106 toward the spool 18.

  On the other hand, the other end side of the interference wire 154 passes through the opening end on the leg plate 16 side of the third insertion hole 152 and passes through the through hole 98 formed in the second lock base body 144. Further, an accommodation groove 156 is formed in the second lock base body 144 corresponding to the other end side of the interference wire 154 that has passed through the through hole 98 and entered the pawl accommodation portion 48. As shown in FIG. 9, the receiving groove 156 is a groove opened on the surface of the second lock base body 144 opposite to the spool 18, and is curved around the center axis of the spool 18. One end of the accommodation groove 156 is open to communicate with the connecting portion 44, and the other end side of the interference wire 154 that has entered the pawl accommodation portion 48 further enters the accommodation groove 156.

  Thus, the interference wire 154 passing through the pawl housing portion 48 and entering the housing groove 156 interferes with the second lock pawl 50 urged by the pawl urging spring 54 to cause the second lock pawl 50 to move. The rotation is restricted.

  As described above, although the webbing take-up device 130 includes the wire 94, the wire 94 functions as the interference unit in the webbing take-up device 130 because the webbing take-up device 130 includes the interference wire 154 as the interference unit. I don't have it.

<Operation and Effect of Second Embodiment>
Next, the operation and effect of the present embodiment will be described through the description of the operation of the webbing take-up device 130.

  In the webbing take-up device 130, the “VSIR mechanism” or “WSIR mechanism” constituting the first lock mechanism 132 is operated to engage the first lock pawl 68 with the ratchet teeth of the ratchet hole 140 formed in the leg plate 14. And the rotation of the first lock base 134 in the pull-out direction is restricted, and thereby the pull-out of the webbing belt 20 from the spool 18 is restricted. In this way, by restricting the pulling of the webbing belt 20 from the spool 18, the body of the occupant trying to move inertially toward the front side of the vehicle is strongly held by the webbing belt 20.

  In this state, when the rotational force in the pull-out direction of the spool 18 caused by the occupant's body pulling the webbing belt 20 exceeds the mechanical strength of the torsion shaft 26, the rotation in the pull-out direction is restricted. The spool 18 rotates in the pull-out direction with respect to the first lock base 134, so that the torsion shaft 26 is deformed so that the torsion shaft 26 is twisted between the connecting portion 28 and the connecting portion 44.

  The spool 18 rotates in the pull-out direction by the torsional deformation of the torsion shaft 26, and the webbing belt 20 is pulled out from the spool 18 by the rotation of the spool 18, and the length of the webbing belt 20 pulled out from the spool 18. The occupant's body can move toward the front of the vehicle by that amount. Further, a part of the energy that the occupant pulls the webbing belt 20 (that is, the kinetic energy of the occupant's body trying to move inertially toward the front of the vehicle) is subjected to deformation of the torsion shaft 26 (that is, the occupant's body's body). Part of the kinetic energy is absorbed by the deformation of the torsion shaft 26).

  On the other hand, as described above, when the spool 18 rotates relative to the first lock base 134 in the pull-out direction, the interference wire having one end held in the holding hole 106 of the first lock base main body 138 (first lock base 134). 154 is pulled out from the opening end of the third insertion hole 152 on the leg plate 14 side by a length corresponding to the amount of relative rotation in the pull-out direction of the spool 18 into the first lock base 134 and accommodated in the guide groove 102.

  Thus, when the interference wire 154 is pulled out from the opening end of the third insertion hole 152 on the leg plate 14 side by the relative rotation of the spool 18 with respect to the first lock base 134, the other end side of the interference wire 154 gradually becomes the third insertion hole 152. It is drawn into the third insertion hole 152 from the opening end on the leg plate 16 side. Thus, when the spool 18 rotates relative to the first lock base 134 until the other end of the interference wire 154 is pulled into the third insertion hole 152, the interference of the second lock pawl 50 by the interference wire 154 is eliminated. The

  When the interference of the wire main body 96 with respect to the second lock pawl 50 is resolved, the second lock pawl 50 rotates around the pawl support shaft 52 by the biasing force of the pawl biasing spring 54, and the ratchet portion 56 formed at the tip thereof. Approaches the ratchet teeth of the ratchet hole 146 formed in the leg plate 16. Accordingly, when the ratchet portion 56 of the second lock pawl 50 meshes with the ratchet teeth of the ratchet hole 146, the rotation of the second lock base 142 in the pull-out direction is restricted.

  In this state, the rotational force in the pull-out direction of the spool 18 caused by the occupant's body pulling the webbing belt 20 exceeds the sum of the mechanical strength of the torsion shaft 26 and the mechanical strength of the second insertion hole 92. If so, the spool 18 rotates in the pull-out direction with respect to both the first lock base 134 and the second lock base 142 whose rotation in the pull-out direction is restricted. The torsion shaft 26 is further deformed by the rotation of the spool 18 in the drawing direction, and the wire main body of the wire 94 from the end of the second insertion hole 92 on the leg plate 16 side in conjunction with the rotation of the spool 18 in the drawing direction. 96 is pulled out.

  The wire body 96 drawn out in this way is squeezed at the edge of the opening end on the leg plate 16 side of the second insertion hole 92 in the second lock base body 46, bent in the rotational radius direction of the spool 18, and further The guide groove 148 enters the inside of the guide groove 148 while being curved following the curve of the guide groove 148. Thus, the spool 18 is twisted and pulled out from the second insertion hole 92 so that it can be deformed following the guide groove 148. The spool 18 rotates in the pull-out direction, and the webbing is rotated by the rotation of the spool 18. The belt 20 is pulled out from the spool 18, and the occupant's body can move forward of the vehicle by the length of the webbing belt 20 pulled out from the spool 18.

  Further, a part of the energy that the occupant pulls the webbing belt 20 (that is, the kinetic energy of the occupant's body trying to move inertially forward of the vehicle) is pulled out from the torsional deformation of the torsion shaft 26 and the second insertion hole 92. The wire body 96 is subjected to the above-described deformation (that is, a part of the kinetic energy of the occupant's body is absorbed by the deformation of the torsion shaft 26 and the wire body 96).

  As described above, in the webbing take-up device 130, the deformation of the wire body 96 (second insertion hole 92) occurs in the middle of the deformation of the torsion shaft 26. Therefore, when the deformation of the wire body 96 is started, Since the energy corresponding to the sum of the energy provided for deformation and the energy provided for the deformation of the wire body 96 is absorbed, the absorbed energy is increased compared to the state where only the torsion shaft 26 is deformed ( Change.

  Moreover, in the present webbing take-up device 130, energy is absorbed by the torsion shaft 26 and the wire 94 as in the first embodiment, so the amount of energy absorbed by the deformation of the torsion shaft 26 and the start of deformation. The time length from end to end can be set relatively freely.

  Further, in the present embodiment, the ratchet portion 56 of the second lock pawl 50 cannot be engaged with the inner teeth of the ratchet hole 146 until the other end portion of the interference wire 154 is drawn into the third insertion hole 152. Therefore, the deformation of the wire body 96 is started after the deformation of the torsion shaft 26 is started with the length from the portion of the interference wire 154 interfering with the second lock pawl 50 to the other end of the interference wire 154. Can be set easily.

  In the present embodiment, the interference wire 154 is used as the interference means. Unlike the wire 94, the interference wire 154 is not required to absorb energy due to deformation. Therefore, the mechanical strength and rigidity of the interference wire 154 restrict the rotation of the second lock pawl 50 while interfering with the second lock pawl 50. All you need to do is Therefore, the interference wire 154 may be configured by a flexible wire, chain, or the like. Further, the interference wire 154 may be accommodated in a straight state in the third insertion hole 152, or may be accommodated in a state in which the interference wire 154 is slackened in the third insertion hole 152. When the interference wire 154 is accommodated in the third insertion hole 152 in a state in which the interference wire 154 is slackened, the deformation of the wire main body 96 is started after the torsion shaft 26 starts to be deformed even by the slackness of the interference wire 154. You can adjust the timing until is started.

  Moreover, in this Embodiment, it was the structure which applied the torsion shaft 26 to the 1st energy absorption means, and applied the wire 94 to the 2nd energy absorption means. However, the first energy absorbing means and the second energy absorbing means are not limited to such a configuration.

  For example, the configuration may be such that the wire 94 is applied to the first energy absorbing means and the torsion shaft 26 is applied to the second energy absorbing means. Further, the torsion shaft 26 is connected to the spool 18 so as not to rotate relative to the spool 18 at the axially intermediate portion of the torsion shaft 26, and the first energy absorption is performed on one side of the connection portion of the torsion shaft 26 with the spool 18. As a means, the other side of the connection portion of the torsion shaft 26 with the spool 18 may be the second energy absorbing means. Further, a plurality of wires 94 may be provided, and one wire 94 may be a first energy absorbing unit, and the other wire 94 may be a second energy absorbing unit.

It is front sectional drawing which shows the outline of a structure of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a side view which shows the outline of a structure of the 2nd locking means which comprises the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a side view corresponding to FIG. 2 which shows the state which the 2nd locking means act | operated. It is a side view which shows the outline of a structure of the principal part of the 1st locking means which comprises the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a side view corresponding to FIG. 4 which shows the state which the 1st locking means act | operated. (A) is a front view which shows the structure of an interference means, (B) is a side view which shows the structure of an interference means. FIG. 5 is a side view of the first lock base constituting the first lock means from the side opposite to the direction shown in FIG. It is front sectional drawing which shows the outline of a structure of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a side view which shows the outline of a structure of the 2nd locking means which comprises the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. It is a side view corresponding to FIG. 9 which shows the state which the 2nd locking means act | operated. FIG. 10 is a side view of the second lock base constituting the second lock means viewed from the side opposite to the direction shown in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 18 Spool 20 Webbing belt 22 1st insertion hole 26 Torsion shaft (1st energy absorption means)
38 Second lock base (second lock means)
50 Second lock pawl (second lock member)
62 First lock mechanism (first lock means)
68 First lock pawl (first lock member)
92 2nd insertion hole 94 wire (2nd energy absorption means, interference means)
130 Webbing take-up device 132 First locking mechanism (first locking means)
142 Second lock base (second lock means)
154 Interference wire (interference means)

Claims (3)

A first insertion hole opened at the axial end is formed, and a first insertion hole formed at a position displaced in the rotational radial direction or the rotational circumferential direction with respect to the first insertion hole is opened at the axial end. 2 insertion holes are formed, and the longitudinal base end side of the long belt-like webbing belt is locked, and the webbing belt is wound from the longitudinal base end side by rotation in the winding direction which is one of the axes. A spool to take and store,
A first energy absorbing means provided in the spool in a state where a part of the first insertion hole enters the first insertion hole, and a side provided in the first insertion hole is not rotatable relative to the spool; ,
A second energy absorbing means that is provided in the spool in a state where a part thereof enters the inside of the second insertion hole, and the side provided in the second insertion hole is configured to be non-rotatable relative to the spool; ,
A first lock member provided at one end of the spool in the axial direction, and operates when the vehicle suddenly decelerates and the spool suddenly rotates in the pull-out direction to absorb the first energy in the first lock member; Engaging with either one of the energy absorbing means and the second energy absorbing means, and the engaging portion of the energy absorbing means with the first lock member rotates with the spool. First locking means for regulating
The spool is provided on the side of one end or the other end in the axial direction of the spool, and is biased in a direction to be engaged with either one of the first energy absorbing means and the second energy absorbing means. Two locking members, and when the second locking member is engaged with any one of the other energy absorbing means, the engaging portion of the any one of the other energy absorbing means with the second locking member is in the spool. A second locking means for restricting rotation accompanying the rotation;
The second lock member is prevented from moving in a direction that interferes with the second lock means and engages with the other energy absorption means, and the first lock member is moved to the one energy absorption means. Interference means for releasing the interference with the second locking means in conjunction with a predetermined angle rotation in the pull-out direction of the spool in a state where
A webbing take-up device comprising:   The spool is inserted into the spool while interfering with the second lock member, and is held by the first lock means when the first lock means is operated, and the spool in the state where the first lock means is operated. The interference means includes an interference member that is pulled out from the spool in accordance with the amount of rotation in the pull-out direction and that eliminates interference with the second lock member by being pulled out from the spool exceeding a certain amount. Item 5. A webbing take-up device according to Item 1.   The webbing take-up device according to claim 2, wherein the first locking means is provided on the opposite side of the second locking means along the axial direction of the spool from the spool.

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