JP2011189896A - Webbing winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a webbing winding device capable of accurately adjusting and changing an energy absorbing amount by a deformation of a load absorption means. <P>SOLUTION: In the webbing winding device 10, a driving force of a motor 60 is applied to a motor side connecting part 44 side to be an opposite side end part to a spool side connecting part 32 relatively nonrotatably linked to a spool 18 in a torsion shaft 24. When an occupant is small in stature, and an absorbed amount of energy by the torsional deformation of the torsion shaft 24 is allowed to be small, the motor 60 is reversely driven to rotate the motor side connecting part 44 side in the drawing direction. The amount of the energy absorbed by the torsional deformation of the torsion shaft 24 becomes small thereby. A friction clutch is not required to be applied to a clutch 54 interposed between the motor 60 and the motor side connecting part 44, so that an adjustment accuracy of the amount of the energy absorbed by the torsional displacement of the torsion shaft 24 can be enhanced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a webbing take-up device that constitutes a seat belt device that restrains an occupant's body with a long belt-like webbing belt.

  In the seat belt retractor (webbing take-up device) disclosed in Patent Document 1 below, when the torsion bar (torsion shaft) is torsionally deformed, the torque of the electric motor is compared with the belt reel (spool) in the torsion bar. It can be applied to the connecting part side (the right side of FIGS. 1 and 2 in the cited document 1), and for example, in addition to torsional deformation, the rotational force of the motor can be applied to torsionally deform the torsion bar. The amount of energy absorbed can be adjusted.

Gazette of Special Table 2003-500303

  However, in the configuration of the cited document 1, the output shaft of the electric motor is connected to the belt reel via the drive spring and the planetary gear mechanism. In another embodiment of Patent Document 1, an output shaft of an electric motor is connected to a belt reel via a clutch or a planetary gear mechanism.

  In the clutch disclosed in Patent Document 1, when the clutch connects the output shaft of the motor and the belt reel, or when the driving force of the motor is transmitted to the belt reel while the output shaft of the motor is connected to the belt reel. In addition, friction and plastic deformation occur in the clutch roller. Since a part of the driving force of the electric motor is used for friction generated in the clutch roller and plastic deformation of the clutch roller, the accuracy of adjusting the amount of energy absorbed by the torsional deformation of the torsion bar is low.

  In view of the above fact, an object of the present invention is to obtain a webbing take-up device capable of accurately adjusting and changing the amount of energy absorbed by deformation of the load absorbing means.

  In the webbing take-up device according to the first aspect of the present invention, the longitudinal base end side of the long belt-like webbing belt is locked, and the webbing belt is drawn out while winding the webbing belt from the base end side. Thus, the spool rotating in the pull-out direction and the spool-side connecting portion are connected so as not to be relatively rotatable with respect to the spool, and the spool side with respect to the driving means side connecting portion set at a position different from the spool-side connecting portion. Load absorbing means that deforms when the connecting portion rotates, and mechanically connected to the drive means side connecting portion of the load absorbing means, when the vehicle suddenly decelerates and when the spool is accelerated more than a predetermined size The driving means side connecting portion is connected to the spool by rotating a driving force at a timing that is at least one of the rotation in the pulling direction. And a driving means for rotating the pull-out direction at a speed slower than the speed.

  In the webbing take-up device according to the first aspect of the present invention, the spool is connected to the spool side connecting portion of the load absorbing means, and when the vehicle suddenly decelerates or the spool is accelerated at a predetermined magnitude or more. When the spool side coupling portion rotates together with the spool in the pulling direction relative to the driving means side coupling portion set at a position different from the spool side coupling portion in the load absorbing means when rotating in the pulling direction, the load absorbing means is deformed. Arise. The force that rotates the spool in the pull-out direction, that is, for example, the body of an occupant trying to move inertially toward the front of the vehicle when the vehicle suddenly decelerates, is absorbed by deformation caused by the load absorbing means. The inertial movement of the occupant's body toward the vehicle front side is suppressed.

  Here, the driving means side connecting portion of the load absorbing means is connected to the driving means, as in the case where the vehicle suddenly decelerates as described above, or when the spool rotates in the pull-out direction with an acceleration of a predetermined magnitude or more. When the driving means is actuated at such a predetermined timing, the driving force of the driving means is transmitted to the driving means side connecting portion of the load absorbing means. Thus, when the driving force of the driving means is transmitted to the driving means side connecting portion of the load absorbing means, the driving means side connecting portion rotates in the pull-out direction at a speed slower than the rotation speed in the pull-out direction of the spool.

  When the driving means side connecting portion of the load absorbing means rotates in the pulling direction by the driving force of the driving means while the spool side connecting portion of the load absorbing means is rotating in the pulling direction together with the spool, the driving means side connection of the load absorbing means. Load (energy) that is gently deformed and absorbed later than when the spool side coupling portion rotates in the pull-out direction together with the spool in a state where the portion stops (the rotation of the driving means side coupling portion is regulated and held) Becomes smaller.

  As described above, in the webbing take-up device according to the present invention, the driving force of the driving means is applied to the driving means side connecting portion of the load absorbing means and the driving means side connecting portion is rotated, so that the load absorbing means absorbs it. Load (energy) can be adjusted. Moreover, even if a clutch is interposed between the drive means side connecting portion of the load absorbing means and the drive means, the connection between the drive means side connecting portion of the load absorbing means and the drive means, or from the drive means to the drive means side. Since it is not necessary to use a friction clutch that causes friction or plastic deformation in the clutch member when transmitting the driving force to the connecting portion, even if the driving force of the driving means is applied to the driving means side connecting portion of the load absorbing means, the load The adjustment accuracy of the load (energy) absorbed by the absorbing means can be increased.

  In the webbing take-up device according to the present invention, the driving means side connecting portion of the load absorbing means rotating by the driving force of the driving means has a lower rotational speed than the spool side connecting portion of the load absorbing means. The rotation direction of the part is the same as that of the spool side connecting part. For this reason, the driving force of the driving means does not greatly oppose the rotation of the spool side connecting portion, and hence the rotation of the spool in the pulling direction. Thereby, the rated output of the drive means does not need to be increased particularly, and the drive means can be reduced in size. Further, since the driving force of the driving means when the load absorbing means causes the deformation is unidirectional, the control of the driving means is simple.

  In the webbing take-up device according to the second aspect of the present invention, the base end side in the longitudinal direction of the long webbing belt is locked, and the webbing belt is drawn out while the webbing belt is wound from the base end side. Thus, the spool rotating in the pull-out direction and the spool-side connecting portion are connected so as not to be relatively rotatable with respect to the spool, and the spool side with respect to the driving means side connecting portion set at a position different from the spool-side connecting portion. A load absorbing means that is deformed by rotation of the connecting portion; and mechanically connected to the driving means side connecting portion of the load absorbing means, and the spool side connecting portion is connected to the driving means side connecting portion side. Driving means for rotating the driving means side connecting portion in the winding direction by outputting a driving force when the load absorbing means is deformed by rotating in the pulling direction. .

  In the webbing take-up device according to the second aspect of the present invention, the spool is connected to the spool side connecting portion of the load absorbing means, and when the vehicle suddenly decelerates or the spool is at an acceleration greater than a predetermined size. When the spool side coupling portion rotates together with the spool in the pulling direction relative to the driving means side coupling portion set at a position different from the spool side coupling portion in the load absorbing means when rotating in the pulling direction, the load absorbing means is deformed. Arise. The force that rotates the spool in the pull-out direction, that is, for example, the body of an occupant trying to move inertially toward the front of the vehicle when the vehicle suddenly decelerates, is absorbed by deformation caused by the load absorbing means. The inertial movement of the occupant's body toward the vehicle front side is suppressed.

  Here, the driving means side connecting portion of the load absorbing means is connected to the driving means, and when the spool side connecting portion rotates relative to the driving means side connecting portion in the pulling direction together with the spool, the load absorbing means is deformed. The driving means is activated, and the driving force of the driving means is transmitted to the driving means side connecting portion of the load absorbing means. Thus, when the driving force of the driving means is transmitted to the driving means side connecting portion of the load absorbing means, the driving means side connecting portion rotates in the winding direction.

  When the spool-side connecting portion of the load absorbing means rotates in the pull-out direction together with the spool, the driving means-side connecting portion of the load absorbing means rotates in the winding direction by the driving force of the driving means. Load (energy) that is deformed and absorbed more rapidly than when the spool side coupling portion rotates in the pull-out direction together with the spool in a state where the coupling portion is stopped (rotation of the driving means side coupling portion is regulated and held). Also grows.

  As described above, in the webbing take-up device according to the present invention, the driving force of the driving means is applied to the driving means side connecting portion of the load absorbing means and the driving means side connecting portion is rotated, so that the load absorbing means absorbs it. Load (energy) can be adjusted. Moreover, even if a clutch is interposed between the drive means side connecting portion of the load absorbing means and the drive means, the connection between the drive means side connecting portion of the load absorbing means and the drive means, or from the drive means to the drive means side. Since it is not necessary to use a friction clutch that causes friction or plastic deformation in the clutch member when transmitting the driving force to the connecting portion, even if the driving force of the driving means is applied to the driving means side connecting portion of the load absorbing means, the load The adjustment accuracy of the load (energy) absorbed by the absorbing means can be increased.

  By the way, in general, the webbing take-up device has a locking mechanism at a position different from the spool side connecting portion of the load absorbing means (a position corresponding to the driving means side connecting portion of the load absorbing means in the webbing take-up device according to the present invention). Is provided.

  This locking mechanism is activated when the vehicle suddenly decelerates or when the spool rotates in the pull-out direction with an acceleration greater than a predetermined magnitude. When the lock mechanism is activated, a position different from the spool side connecting portion of the load absorbing means is held by the lock mechanism. As a result, the pull-out of the webbing belt from the spool is restricted, and the spool-side connecting portion rotates in the pull-out direction together with the spool while the lock mechanism holds a position different from the spool-side connecting portion of the load absorbing means. Thus, the load absorbing means is deformed.

  Here, such a lock mechanism operates to hold the load absorbing means. However, the portion held by the lock mechanism in the load absorbing means is controlled by the lock mechanism, although the rotation in the pull-out direction is restricted. Rotation in the direction is allowed.

  Therefore, such a locking mechanism is provided in the webbing take-up device according to the present invention, and the driving force of the driving means is connected to the driving means side of the load absorbing means even when the locking mechanism is activated when the driving means is activated. The driving means side connecting portion can be rotated by transmitting to the portion. That is, in the webbing take-up device according to the present invention, a lock mechanism that is generally applied in the webbing take-up device can be used in order to restrict the drawing of the webbing belt from the spool. Further, since the driving force of the driving means when the load absorbing means causes the deformation is unidirectional, the control of the driving means is simple.

  As described above, the webbing take-up device according to the present invention can adjust and change the amount of energy absorbed by the deformation of the load absorbing means with high accuracy.

1 is a front view schematically showing a configuration of a webbing take-up device according to a first embodiment of the present invention. In the webbing take-up device according to the first embodiment of the present invention, the magnitude of the load (energy) absorbed by the deformation of the load absorbing means when the driving means side connecting portion of the load absorbing means does not rotate, and the load absorbing means It is a schematic graph which shows the magnitude | size of the load (energy) absorbed by the deformation | transformation of a load absorption means in the state which provided the drive force of the drive means to the drive means side connection part. It is a front view which shows roughly the structure of the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. In the webbing take-up device according to the second embodiment of the present invention, the magnitude of the load (energy) absorbed by the deformation of the load absorbing means in a state where the drive means side connecting portion of the load absorbing means does not rotate, and the load absorbing means It is a schematic graph which shows the magnitude | size of the load (energy) absorbed by the deformation | transformation of a load absorption means in the state which provided the drive force of the drive means to the drive means side connection part. In the modification of the webbing take-up device according to the embodiment of the present invention, the load (energy) absorbed by the deformation of the load absorbing means in a state where the driving means side connecting portion of the load absorbing means does not rotate, and the load absorbing means It is a schematic graph which shows the magnitude | size of the load (energy) absorbed by the deformation | transformation of a load absorption means in the state which provided the drive force of the drive means to the drive means side connection part.

<Configuration of First Embodiment>
FIG. 1 is a front sectional view showing an outline of the entire configuration of a webbing retractor 10 according to a first embodiment of the present invention.

  As shown in FIG. 1, the webbing take-up device 10 includes a frame 12. In the frame 12, for example, a pair of leg plates 14 and 16 facing each other substantially in the vehicle longitudinal direction are extended in parallel to each other. A substantially cylindrical spool 18 is disposed between the leg plates 14 and 16. The spool 18 has an axial direction opposite to the leg plates 14 and 16 and is rotatable around its own axis. Further, the longitudinal base end portion of the long belt-like webbing belt 20 is locked to the spool 18.

  The webbing belt 20 is wound and accommodated in a layered manner from the proximal end side to the outer peripheral portion of the spool 18 by rotating the spool 18 in a winding direction that is one of its axes. Further, when the webbing belt 20 is pulled from the front end side, the webbing belt 20 wound around the spool 18 is pulled out, and accordingly, the spool 18 rotates in a pulling direction opposite to the winding direction.

  On the other hand, a torsion housing hole 22 is formed in the spool 18. The torsion housing hole 22 is a hole formed along the center axis of the spool 18, and a torsion shaft 24 as a load absorbing means is provided coaxially with the spool 18 on the inside thereof. Further, a fitting hole 26 is formed in the spool 18 on the leg plate 14 side of the spool 18. The fitting hole 26 has a noncircular shape such as a polygonal shape or a star shape, and is larger than the inner circumferential shape of the torsion receiving hole 22. The end of the torsion receiving hole 22 on the leg plate 14 side is the fitting hole 26. Open at the bottom.

  A sleeve 28 is inserted into the fitting hole 26. The outer peripheral shape of the sleeve 28 is set to the same shape as the inner peripheral shape of the fitting hole 26. Since the inner peripheral shape of the fitting hole 26 and the outer peripheral shape of the sleeve 28 are both non-circular, such as polygonal or star shape, the sleeve 28 inserted into the fitting hole 26 cannot be rotated relative to the spool 18. It is said that. The sleeve 28 is formed with a fitting hole 30 opened in the direction from the leg plate 14 to the leg plate 16.

  The inner peripheral shape of the fitting hole 30 is a non-circular shape such as a polygon or a star. A spool side connecting portion 32 that is an end portion of the torsion shaft 24 on the leg plate 14 side is fitted into the fitting hole 30. The outer peripheral shape of the spool side connecting portion 32 is the same shape as the inner peripheral shape of the fitting hole 30, and in a state where the spool side connecting portion 32 is inserted into the fitting hole 30, the torsion shaft 24 with respect to the sleeve 28 is arranged. The relative rotation is disabled, and as a result, the relative rotation of the sleeve 28 with respect to the spool 18 is basically disabled.

  On the other hand, a shaft portion 34 is formed to project from the end portion of the sleeve 28 on the leg plate 14 side. The shaft portion 34 is substantially coaxial with the spool 18, and the tip side thereof passes through the leg plate 14 and enters the inside of the spring case 36 attached to the leg plate 14 on the side opposite to the leg plate 16 of the leg plate 14, The spring case 36 is rotatably supported. A spool urging means (not shown) constituted by a spiral spring or the like is accommodated inside the spring case 36. The spool urging means is directly or indirectly connected to the shaft portion 34, and when the sleeve 28 rotates in the pull-out direction, the urging force of the spool urging means increases to cause the shaft portion 34 (that is, the sleeve 28) to move. Energize in the winding direction.

  On the other hand, a fitting hole 38 is formed in the spool 18 on the leg plate 16 side of the spool 18. The fitting hole 38 has an inner circumferential shape that is coaxial with the spool 18 and is sufficiently larger than the inner circumferential shape of the torsion receiving hole 22. The end of the torsion receiving hole 22 on the leg plate 16 side is the fitting hole 38. Open at the bottom.

  A sleeve 40 is inserted into the fitting hole 38. The sleeve 40 has a circular outer shape with the same shape as the inner peripheral shape of the fitting hole 38. For this reason, the sleeve 40 inserted into the fitting hole 38 can rotate relative to the spool 18. The sleeve 40 is formed with a fitting hole 42 opened in the direction from the leg plate 16 to the leg plate 14. The inner peripheral shape of the fitting hole 42 is a non-circular shape such as a polygon or a star. A motor side connecting portion 44 as a driving means side connecting portion, which is an end portion of the torsion shaft 24 on the leg plate 16 side, is fitted into the fitting hole 42. The outer peripheral shape of the motor side connecting portion 44 is the same as the inner peripheral shape of the fitting hole 42. When the motor side connecting portion 44 is inserted into the fitting hole 42, the torsion shaft 24 with respect to the sleeve 40 is arranged. Relative rotation is impossible.

  On the other hand, a shaft portion 46 is formed to protrude from the end portion of the sleeve 40 on the leg plate 16 side. The shaft portion 46 is substantially coaxial with the spool 18, and the tip end side thereof passes through the leg plate 16, and the gear housing of the driving force transmission mechanism 50 attached to the leg plate 16 on the side opposite to the leg plate 14 of the leg plate 16. 52, and is rotatably supported by the gear housing 52. A clutch 54 is accommodated inside the gear housing 52. The clutch 54 includes a ring-shaped worm wheel 56 that constitutes a self-locking mechanism that is one mode of the locking means. The worm wheel 56 is disposed coaxially with the shaft portion 46.

  Further, one or more pawls are provided inside the worm wheel 56. The pawl is mechanically connected to the worm wheel 56 at a position eccentric from the rotation center of the worm wheel 56, and rotates around the shaft portion 46 together with the worm wheel 56. Further, the pawl can be rotated with respect to the worm wheel 56 around an axis parallel to the shaft portion 46 at a connecting portion with the worm wheel 56. Further, an adapter (not shown) is provided at the axial center portion of the worm wheel 56. This adapter is coaxially and integrally connected to the shaft portion 46, and rotates together with the shaft portion 46 and eventually the spool 18.

  In addition, ratchet teeth are formed on the outer periphery of the adapter. When the worm wheel 56 rotates in the winding direction, the pawl rotates in conjunction with the rotation of the worm wheel 56, and the tip of the pawl is connected to the adapter. Engage with the outer ratchet teeth. In this engaged state, the worm wheel 56 is mechanically connected to the shaft portion 46 via the pawl and the adapter, and the rotation of the worm wheel 56 in the winding direction and the pull-out direction is transferred to the shaft portion 46 via the pawl and the adapter. The shaft portion 46 is rotated in the winding direction or the drawing direction.

  On the other hand, as shown in FIG. 1, a motor 60 as a driving unit is provided below the spool 18. The motor 60 is on the opening direction side of the frame 12 in which the output shaft 62 has a substantially concave shape in plan view, and the front end side enters a gear case (not shown) different from the gear housing 52 described above. A spur gear 64 is housed inside the gear case into which the distal end side of the output shaft 62 enters. The gear 64 is coaxially and integrally attached to the output shaft 62. A spur gear 66 having a sufficiently larger number of teeth than the gear 64 is arranged on the side of the rotational radius direction of the gear 64 in the gear case.

  The gear 66 has a rotating shaft 68 in the same direction as the gear 64 and meshes with the gear 64. Further, a spur gear 70 having a sufficiently smaller number of teeth than the gear 66 is formed coaxially and integrally with the gear 66. Further, a spur gear 72 having a sufficiently larger number of teeth than that of the gear 70 is disposed on the side of the rotational radius direction of the gear 70 in the gear case.

  The gear 72 has a rotating shaft 74 in the same direction as the gears 64 to 72 and meshes with the gear 70. The rotation shaft 74 of the gear 72 protrudes from the gear case and further enters the gear housing 52.

  A worm gear 76 that forms a self-locking mechanism, which is one mode of the locking means, together with the worm wheel 56 is provided on the side of the worm wheel 56 in the radial direction of rotation in the gear housing 52. The worm gear 76 is coaxially and integrally connected to the rotating shaft 74. The worm gear 76 meshes with the worm wheel 56, and the rotation of the output shaft 62 of the motor 60 is transmitted to the worm gear 76 via the gears 64 to 72. Further, the rotation of the worm gear 76 is transmitted to the worm wheel 56. The worm wheel 56 rotates.

  On the other hand, as shown in FIG. 1, the motor 60 is electrically connected to an ECU 90 as a control means. The ECU 90 is electrically connected to the motor 60. Based on the drive control signal output from the ECU 90, the motor 60 is driven to rotate in the forward direction to rotate the worm wheel 56 in the winding direction, or driven in the reverse direction to move the worm wheel. 56 is rotated in the pull-out direction.

  The ECU 90 is connected to a forward monitoring device 92 as forward monitoring means, and a monitoring signal output from the forward monitoring device 92 is input to the ECU 90. The forward monitoring device 92 outputs detection waves such as infrared rays and radar in front of the vehicle, and receives detection waves reflected by obstacles in front of the vehicle and other vehicles traveling in front of the vehicle. Or the distance to another vehicle traveling in front of the vehicle, and when the distance to the obstacle ahead of the vehicle or other vehicle traveling forward is less than a predetermined value, the monitoring output from the front monitoring device 92 For example, the signal is switched from the Low level to the High level. When the monitoring signal is switched from the Low level to the High level, the ECU 90 outputs a drive control signal for driving the motor 60 to rotate forward.

  Further, the ECU 90 is electrically connected to the airbag ECU 94 as a trigger means, and an activation signal output from the airbag ECU 94 is input to the ECU 90. The airbag ECU 94 constitutes control means for an airbag device (not shown) that inflates and deploys the bag body in front of the seat corresponding to the webbing retractor 10 in a vehicle sudden deceleration state or the like. When the airbag ECU 94 activates the airbag device in a vehicle sudden deceleration state or the like, the activation signal output from the airbag ECU 94 is switched from Low level to High level, and the ECU 90 reverses the motor 60. A drive control signal for driving is output.

  The ECU 90 is electrically connected to a load sensor 96 as occupant physique detection means. The load sensor 96 is provided, for example, on a seat cushion (not shown) of a seat corresponding to the webbing retractor 10, and outputs a physique detection signal at a level corresponding to the weight of the occupant seated on the seat. This physique detection signal is input to the ECU 90. When the high-level activation signal output from the airbag ECU 94 is input to the ECU 90, the ECU 90 outputs a drive control signal based on the level of the physique detection signal output from the load sensor 96, and is output from the load sensor 96. The worm wheel 56 is rotated in the pull-out direction at a speed based on the level of the physique detection signal.

  Further, the ECU 90 is electrically connected with a rotation detection sensor 98 as a rotation speed detection means. The rotation detection sensor 98 is disposed, for example, facing the flange portion of the spool 18 along the axial direction of the spool 18 and detects a change in the rotation position of the spool 18. The ECU 90 calculates the rotation speed of the spool 18 based on the rotation position detection signal output from the rotation detection sensor 98.

  The ECU 90 outputs a drive control signal based on the level of the physique detection signal output from the load sensor 96 to drive the motor 60, and corrects the drive control signal from the calculation result of the rotational speed of the spool 18 to correct the motor 60. The rotational speed of the worm wheel 56 by the driving force is adjusted.

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

  In the webbing take-up device 10, the front monitoring device 92 outputs a detection wave to the front of the vehicle while the vehicle is running, and is further reflected by an obstacle in front of the vehicle or another vehicle traveling in front of the vehicle. Based on the detection wave, the distance to the obstacle ahead of the vehicle and another vehicle traveling ahead is calculated. Based on the calculation result, when the distance to an obstacle ahead of the vehicle or another vehicle traveling ahead is less than a predetermined value, the monitoring signal output from the front monitoring device 92 is switched from the Low level to the High level.

  When this high level monitoring signal is input to the ECU 90, the ECU 90 outputs a drive control signal to drive the motor 60 in the normal direction. The forward driving force output from the motor 60 is transmitted to the worm wheel 56 of the clutch 54 via the gears 64, 68, 70, 72 and the worm gear 76, and rotates the worm wheel 56 in the winding direction. When the worm wheel 56 rotates in the winding direction, the pawl of the clutch 54 rotates around an axis parallel to the shaft portion 46 at the connecting portion with the worm wheel 56, and is formed on the outer peripheral portion of the adapter constituting the clutch 54. Ratchet teeth mesh. As a result, the rotational force of the worm wheel 56 in the winding direction is transmitted to the adapter via the pawl, and the adapter, and thus the shaft portion 46 of the sleeve 40, is rotated in the winding direction.

  Although the shaft portion 46 is fitted in the fitting hole 38 so as to be rotatable relative to the spool 18, the torsion shaft 24 in which the motor side connecting portion 44 is fitted in the fitting hole 42 of the sleeve 40 On the other hand, it is connected to the spool 18 via the sleeve 28 so as not to be relatively rotatable. For this reason, the rotational force transmitted to the sleeve 40 in the winding direction is transmitted to the spool 18 via the torsion shaft 24 and the sleeve 28 and rotates the spool 18 in the winding direction. As a result, so-called “slack” which is a slight slack of the webbing belt 20 is removed, and the restraining force by the webbing belt 20 increases.

  On the other hand, for example, if the vehicle decelerates suddenly in this state and the occupant's body tries to move forward due to inertia, the occupant's body pulls the webbing belt 20 and tries to rotate the spool 18 in the pull-out direction. The rotational force of the spool 18 in the pulling direction is transmitted to the worm wheel 56 of the clutch 54 through the sleeve 28, the torsion shaft 24, and the sleeve 40, and tries to rotate the worm wheel 56 in the pulling direction.

  However, the worm wheel 56 meshes with the worm gear 76. In the relationship between the worm wheel 56 and the worm gear 76, the rotational force can be transmitted from the worm gear 76 to the worm wheel 56, but the rotational force cannot be transmitted from the worm wheel 56 to the worm gear 76 (in other words, in the present embodiment). The torsion angle of the worm gear 76 is set smaller than the repose angle so that the worm wheel 56 cannot rotate the worm gear 76).

  For this reason, in this state, the spool 18 cannot rotate in the pull-out direction, and as a result, the webbing belt 20 cannot be pulled out from the spool 18. Thereby, it can suppress that a passenger | crew's body moves to the vehicle front side with the inertia at the time of vehicle sudden deceleration.

  On the other hand, when the webbing belt 20 is pulled by the occupant's body as described above and the rotational force in the pull-out direction of the spool 18 exceeds the mechanical strength of the torsion shaft 24, the rotation in the pull-out direction is restricted. The spool side coupling portion 32 side of the torsion shaft 24 rotates in the pull-out direction with respect to the motor side coupling portion 44 side of the torsion shaft 24, and torsional deformation occurs in the torsion shaft 24. The spool 18 can rotate in the pull-out direction by the amount of torsional deformation of the torsion shaft 24, the webbing belt 20 can be pulled out from the spool 18, and part of the pulling force applied to the webbing belt 20 from the occupant's body The torsion shaft 24 is subjected to torsional deformation, whereby a part of the pulling force that the occupant's body pulls the webbing belt 20 is absorbed.

  By the way, in this webbing take-up device 10, when the activation signal output from the airbag ECU 94 is switched from the Low level to the High level by the operation of the airbag ECU 94, the ECU 90 outputs the physique detection signal output from the load sensor 96. The drive control signal of the level based on is output. Here, for example, when the occupant is large and needs to absorb a large amount of the above-described pulling force due to the torsional deformation of the torsion shaft 24, the ECU 90 that has been driving the motor 60 in the forward direction until then, Stop. As a result, as described above, the spool-side connecting portion 32 side of the torsion shaft 24 rotates in the drawing direction relative to the motor-side connecting portion 44 side of the torsion shaft 24 whose rotation in the drawing direction is restricted, and the torsion shaft At 24, torsional deformation occurs.

  On the other hand, for example, when the occupant is small and the amount of energy absorbed by the torsional deformation of the torsion shaft 24 may be small, the speed of the spool 18 is increased based on the physique detection signal output from the load sensor 96. The motor 60 is driven in reverse so that the worm wheel 56 is rotated in the pull-out direction at a speed slower than the rotation speed in the pull-out direction.

  When the motor 60 is driven in this way, the rotational speed of the torsion shaft 24 in the pull-out direction relative to the side of the motor-side connecting portion 44 on the side of the spool-side connecting portion 32 rotates on the motor-side connecting portion 44 side of the torsion shaft 24. The rotational speed in the pull-out direction relative to the spool-side connecting portion 32 relative to the motor-side connecting portion 44 in the regulated state becomes slower, and the torsional deformation of the torsion shaft 24 becomes gentle. For this reason, the amount of energy absorbed by torsional deformation of the torsion shaft 24 is reduced, as indicated by the solid line and the alternate long and short dash line in FIG.

  Further, in the webbing take-up device 10, the rotation detection sensor 98 detects a change in the rotation position of the spool 18, and the ECU 90 determines the rotation speed of the spool 18 based on the rotation position detection signal output from the rotation detection sensor 98. Arithmetic. As described above, the magnitude of energy absorbed by the torsional deformation of the torsion shaft 24 depends on the rotational speed of the torsion shaft 24 in the pull-out direction on the spool side connecting portion 32 side and the motor side connecting portion 44 on the torsion shaft 24. It is determined by the difference with the rotational speed in the pull-out direction on the side. The rotation speed of the spool 18 in the pull-out direction is the rotation speed in the pull-out direction of the torsion shaft 24 on the spool side connecting portion 32 side.

  The ECU 90 corrects a drive control signal for driving the motor 60 based on the calculation result of the rotational speed of the spool 18. As a result, the difference between the rotational speed in the pull-out direction on the spool-side connecting portion 32 side of the torsion shaft 24 and the rotational speed in the pull-out direction on the motor-side connecting portion 44 side of the torsion shaft 24 is adjusted. In addition, energy of an appropriate magnitude corresponding to the magnitude of the force with which the passenger's body pulls the webbing belt 20 can be absorbed by torsional deformation of the torsion shaft 24.

  Moreover, the webbing take-up device 10 is configured to apply the driving force of the motor 60 to the motor side connecting portion 44 of the torsion shaft 24. For this reason, the clutch 54 interposed between the output shaft 62 of the motor 60 and the motor side connecting portion 44 of the torsion shaft 24 is engaged with the ratchet teeth of the adapter by the pawl rotated as described above. The output shaft 62 and the motor side connecting portion 44 of the torsion shaft 24 are mechanically connected to each other so that the driving force of the motor 60 is applied to the motor side connecting portion 44. Thus, when connecting the output shaft 62 of the motor 60 and the motor side connecting portion 44 of the torsion shaft 24, it is not necessary to use a friction clutch that plastically deforms the clutch member or generates friction in the clutch member. The adjustment accuracy of the amount of energy absorbed by the torsional deformation of the torsion shaft 24 can be increased.

  Further, in the webbing take-up device 10, much of the energy is absorbed by the torsion shaft 24, and the amount of energy to be absorbed is adjusted by rotating the motor side connecting portion 44 of the torsion shaft 24 in the pull-out direction by the driving force of the motor 60. It is a configuration. Thus, since the direction of rotation of the torsion shaft 24 when the torsion shaft 24 undergoes torsional deformation and the direction of the driving force of the motor 60 are the same, the force of the motor 60 can be relatively small. For this reason, the power consumption in the motor 60 can be reduced.

<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. 3 is a front sectional view showing an outline of the entire configuration of the webbing take-up device 110 according to the present embodiment.

  As shown in this drawing, the webbing take-up device 110 includes a torsion shaft 112 as a load absorbing means instead of the torsion shaft 24. The torsion shaft 112 is basically the same in configuration as the torsion shaft 24 in the first embodiment, but has a lower mechanical strength than the torsion shaft 24. For example, the motor side connecting portion of the torsion shaft 112 The rotation speed when the spool side connecting portion 32 side rotates in the pull-out direction with the rotation on the 44 side restricted, and the rotation on the motor side connecting portion 44 side of the torsion shaft 24 in the first embodiment are restricted. If the rotation speed when the spool side connecting portion 32 side rotates in the pull-out direction is the same, the energy absorbed by the torsional deformation of the torsion shaft 112 becomes the torsional deformation of the torsion shaft 24. Less than the energy absorbed.

  The webbing take-up device 110 includes a driving force transmission mechanism 114 instead of the driving force transmission mechanism 50. The driving force transmission mechanism 114 includes a clutch 116 instead of the clutch 54. The basic structure of the clutch 116 is the same as that of the clutch 54 in the first embodiment, but the clutch 116 includes a ring gear 118 having external teeth and flat teeth instead of the worm wheel 56.

  Further, the webbing take-up device 110 includes a motor 120 as a driving means instead of the motor 60. In this motor 120, the axial direction of the output shaft 122 is the same as the axial direction of the spool 18, and the tip side of the motor 120 penetrates the leg plate 16 side and projects to the outside of the leg plate 16 (the side opposite to the leg plate 14 of the leg plate 16). The drive force transmission mechanism 114 enters the gear housing 52.

  A spur gear 124 is coaxially and integrally attached to the tip of the output shaft 122 that enters the inside of the gear housing 52. A spur gear 126 having a sufficiently larger number of teeth than the gear 124 is disposed on the side of the rotational radius direction of the gear 124 so as to be rotatable around an axis whose axial direction is the same as the axial direction of the spool 18. The gear 124 is meshed with the gear 126. Further, a spur gear 128 having a sufficiently smaller number of teeth than the gear 126 is formed coaxially and integrally with the gear 126.

  A spur gear 130 having a sufficiently larger number of teeth than the gear 128 is provided on the side of the rotational radius of the gear 128 in the gear housing 52 so as to be rotatable about an axis whose axial direction is the same as the axial direction of the spool 18. The gear 128 is engaged with the gear 130. Further, a spur gear 132 having a sufficiently smaller number of teeth than the gear 130 is coaxially and integrally formed on the gear 130.

  A spur gear 134 having a sufficiently larger number of teeth than the gear 132 and having a smaller number of teeth than that of the ring gear 118 is arranged in the same direction as the axial direction of the spool 18 on the side of the rotational radius direction of the gear 132. It is supported by the gear housing 52 so as to be rotatable around a direction axis. The gear 132 meshes with the gear 130 and also meshes with the ring gear 118 of the clutch 116.

  As described above, the webbing take-up device 110 is configured to transmit the driving force of the motor 120 to the ring gear 118 of the clutch 116 by all the spur gears 124 to 134, and the first embodiment. The worm wheel 56 and the worm gear 76 are not provided.

  Further, the webbing take-up device 110 includes a lock mechanism 140 as a lock unit. The lock mechanism 140 includes a lock base 142. The lock base 142 includes a fitting insertion portion 144 that replaces the sleeve 40 in the first embodiment. The fitting insertion portion 144 has a circular outer shape that is the same shape as the inner circumferential shape of the fitting hole 38 like the sleeve 40 in the first embodiment, and the fitting insertion portion 144 is fitted into the fitting hole 38. In the inserted state, the lock base 142 can rotate relative to the spool 18. A fitting hole 42 is formed in the fitting insertion portion 144 similarly to the sleeve 40 in the first embodiment, and the motor side coupling portion 44 of the torsion shaft 112 is fitted.

  The lock base 142 includes a ratchet portion 146. The ratchet portion 146 is formed coaxially and integrally with the fitting insertion portion 144 on the leg plate 16 side of the fitting insertion portion 144, and the shaft portion 46 from the surface opposite to the fitting insertion portion 144 of the ratchet portion 146. Are formed coaxially and integrally with the insertion part 144 and the ratchet part 146.

  Ratchet teeth are formed on the outer periphery of the ratchet portion 146. Further, a lock pawl 148 is provided on the side of the outer peripheral portion of the ratchet portion 146. The lock pawl 148 is supported by the leg plate 16, the gear housing 52, and the like so as to be rotatable about an axis whose axial direction is the same as the axial direction of the spool 18, and when the lock pawl 148 rotates to one side around the axis. The front end side of the lock pawl 148 approaches the outer peripheral portion of the ratchet portion 146, and the ratchet teeth formed on the front end side of the lock pawl 148 mesh with the ratchet teeth formed on the outer peripheral portion of the ratchet portion 146. Thus, in the state where the ratchet teeth of the lock pawl 148 mesh with the ratchet teeth of the ratchet portion 146, the ratchet portion 146 is allowed to rotate in the winding direction, but the rotation of the ratchet portion 146 in the pull-out direction is restricted. Is done.

  The lock mechanism 140 including the lock base 142 and the lock pawl 148 includes a case 152. The case 152 is provided on the side opposite to the leg plate 16 of the gear housing 52 constituting the driving force transmission mechanism 114 and is integrally attached to the gear housing 52 and the leg plate 16. In the webbing take-up device 110, the distal end side of the shaft portion 46 that has passed through the adapter of the clutch 116 enters the case 152 and is rotatably supported by the case 152.

  Inside the case 152, various parts constituting a so-called “VSIR mechanism” that operates when the vehicle is suddenly decelerated, and the shaft portion 46 of the insertion portion 144 have a rotational acceleration of a predetermined size or more. Various components constituting a so-called “WSIR mechanism” that operates by rotating in the pull-out direction are accommodated. When these “VSIR mechanism” and “WSIR mechanism” are operated, the lock pawl 148 is rotated. Thereby, 148 ratchet teeth mesh with the ratchet teeth of the ratchet portion 146.

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

  In the webbing take-up device 110 as well, as with the webbing take-up device 110 according to the first embodiment, the distance to an obstacle ahead of the vehicle or another vehicle traveling ahead is less than a predetermined value. When the monitoring signal output from the forward monitoring device 92 is switched from Low level to High level, the ECU 90 outputs a drive control signal to drive the motor 120 in the normal direction. The forward driving force of the motor 120 is transmitted to the ring gear 118 of the clutch 116 via the gears 124 to 134 and rotates the ring gear 118 in the winding direction.

  As a result, like the clutch 54 in the first embodiment, the pawl of the clutch 116 rotates around the axis parallel to the shaft portion 46 at the connecting portion with the ring gear 118, and the outer periphery of the adapter constituting the clutch 116. The ratchet teeth formed on the part mesh. Thereby, the rotational force in the winding direction of the ring gear 118 is transmitted to the adapter through the pawl, and the adapter, and consequently the shaft portion 46 of the lock base 142 is rotated in the winding direction.

  The shaft portion 46 is inserted into the fitting hole 38 so as to be rotatable relative to the spool 18, but the lock base 142 is connected to the spool 18 so as not to be rotatable relative to the spool 18 via the torsion shaft 112 and the sleeve 28. Therefore, the rotational force in the winding direction transmitted to the lock base 142 is transmitted to the spool 18 and rotates the spool 18 in the winding direction. As a result, so-called “slack” which is a slight slack of the webbing belt 20 is removed, and the restraining force by the webbing belt 20 is further increased.

  On the other hand, when the vehicle suddenly decelerates, the “VSIR mechanism” constituting the lock mechanism 140 operates. Further, for example, when the vehicle decelerates, the body of an occupant who intends to move inertially toward the front of the vehicle pulls the webbing belt 20, whereby the spool 18 rotates in the pull-out direction with an acceleration of a predetermined size or more. The rotation of the spool 18 in the pull-out direction is transmitted to the lock base 142 via the sleeve 28 and the torsion shaft 112, and the shaft portion 46 of the lock base 142 is rotated in the pull-out direction with an acceleration of a predetermined magnitude or more. Thus, when the shaft portion 46 of the lock base 142 rotates in the pull-out direction with an acceleration of a predetermined magnitude or more, the “WSIR mechanism” constituting the lock mechanism 140 is activated.

  As described above, when the “VSIR mechanism” or “WSIR mechanism” is operated in the lock mechanism 140, the lock pawl 148 is rotated to one side around the axis thereof, and the front end side of the lock pawl 148 is brought into contact with the outer periphery of the ratchet portion 146. Approaching, the ratchet teeth of the lock pawl 148 mesh with the ratchet teeth of the ratchet portion 146. Thereby, the rotation of the ratchet portion 146 in the pull-out direction is restricted.

  In this manner, the rotation of the ratchet portion 146 in the pull-out direction is restricted, so that the rotation of the spool 18 in the pull-out direction is restricted. Thereby, pulling out the webbing belt 20 from the spool 18 can be restricted, and the movement of the occupant's body to the vehicle front side due to inertia at the time of sudden deceleration of the vehicle can be suppressed.

  On the other hand, when the webbing belt 20 is pulled by the occupant's body as described above, when the rotational force in the pull-out direction of the spool 18 exceeds the mechanical strength of the torsion shaft 112, the rotation in the pull-out direction is caused by the lock mechanism 140. The spool side coupling portion 32 side of the torsion shaft 112 rotates in the pull-out direction with respect to the motor side coupling portion 44 side of the regulated torsion shaft 112, and torsional deformation occurs in the torsion shaft 112.

  The spool 18 can rotate in the pull-out direction by the amount of torsional deformation of the torsion shaft 112, the webbing belt 20 can be pulled out from the spool 18, and part of the pulling force applied to the webbing belt 20 from the occupant's body The torsion shaft 112 is subjected to torsional deformation, whereby a part of the pulling force that the occupant's body pulls the webbing belt 20 is absorbed.

  By the way, in this webbing retractor 110, when the activation signal output from the airbag ECU 94 is switched from the Low level to the High level by the operation of the airbag ECU 94, the ECU 90 generates the physique detection signal output from the load sensor 96. The drive control signal of the level based on is output. Here, for example, when the occupant is small and the amount of energy absorbed due to torsional deformation of the torsion shaft 112 may be small, the ECU 90 that has been driving the motor 120 in the forward direction until then, Stop. As a result, as described above, the spool-side connecting portion 32 side of the torsion shaft 112 rotates in the drawing direction relative to the motor-side connecting portion 44 side of the torsion shaft 112 whose rotation in the pull-out direction is restricted, and the torsion shaft At 112, torsional deformation occurs.

  On the other hand, for example, when the occupant is large and it is necessary to increase the amount of energy absorbed by the torsional deformation of the torsion shaft 112, the ECU 90 performs the motor operation at a speed based on the physique detection signal output from the load sensor 96. 120 is driven to rotate forward.

  When the lock base 142 and thus the motor side connecting portion 44 of the torsion shaft 112 is rotated in the winding direction by the forward rotation of the motor 120, the spool side connecting portion 32 side of the torsion shaft 112 with respect to the motor side connecting portion 44 side is increased. The relative rotational speed in the pull-out direction is the relative rotational speed in the pull-out direction on the spool-side connecting portion 32 side with respect to the motor-side connecting portion 44 side in a state where the rotation of the motor-side connecting portion 44 side of the torsion shaft 112 is restricted. And the torsional deformation of the torsion shaft 112 becomes abrupt (that is, the torsion shaft 112 is greatly deformed in a short time). For this reason, the amount of energy absorbed by torsional deformation of the torsion shaft 112 increases as shown by the solid line and the alternate long and short dash line in FIG.

  The lock mechanism 140 regulates the rotation of the lock base 142 and, in turn, the spool 18 in the pull-out direction when the ratchet teeth of the lock pawl 148 mesh with the ratchet teeth of the ratchet portion 146. Even when the teeth are engaged with the ratchet teeth of the ratchet portion 146, the lock base 142 can rotate in the winding direction.

  For this reason, when the lock mechanism 140 is applied to the webbing take-up device 10 according to the first embodiment, the ratchet teeth of the lock pawl 148 and the ratchet teeth of the lock pawl 148 are rotated when the motor 60 is driven to rotate in the reverse direction. The meshing of the ratchet portion 146 with the ratchet teeth must be canceled (that is, the rotation restriction state of the spool 18 by the lock mechanism 140 must be released). Therefore, in order to apply the lock mechanism 140 to the webbing take-up device 10 according to the first embodiment, the rotation of the spool 18 by the lock mechanism 140 is released in conjunction with the reverse drive of the motor 60. Configuration is required.

  On the other hand, in the webbing take-up device 110, the driving direction of the motor 120 for increasing the amount of energy absorbed by the torsional deformation of the torsion shaft 112 is normal rotation driving. Therefore, the lock base 142 can be rotated in the winding direction without releasing the rotation restriction state of the spool 18 by the lock mechanism 140. For this reason, a lock mechanism having a “VSIR mechanism” or “WSIR mechanism” conventionally used, such as the lock mechanism 140, can be applied.

  Moreover, when it is necessary to increase the amount of energy absorbed due to torsional deformation of the torsion shaft 112, the motor-side connecting portion 44 side of the torsion shaft 112 is moved in the winding direction by the driving force of the motor 120 as described above. Since it is a structure to rotate, the mechanical strength of the torsion shaft 112 may be smaller than the mechanical strength of the torsion shaft 24 in the first embodiment. For this reason, the torsion shaft 112 can be made thinner than the torsion shaft 24. The fact that the torsion shaft 112 can be made thinner means that the inner diameter dimension of the torsion receiving hole 22 in the spool 18 can be made smaller. Thereby, size reduction of the spool 18 can be achieved.

  In the first embodiment, the amount of energy absorbed by the torsional deformation of the torsion shaft 24 by rotating the motor side connecting portion 44 side of the torsion shaft 24 in the pull-out direction by the reverse driving force of the motor 60. In the second embodiment described above, the torsion shaft 24 is twisted by rotating the motor side connecting portion 44 side of the torsion shaft 112 in the winding direction with the normal rotation driving force of the motor 120. The amount of energy absorbed by deformation was increased.

  However, from the viewpoint of the present invention described in each of claims 1 and 2, the driving direction of the motor 60 or the motor 120 when the torsion shaft 24 or the torsion shaft 112 undergoes torsional deformation is normal rotation driving. It is not limited to any one of the reverse drive and the reverse drive. For example, the ECU 90 appropriately drives the driving direction of the motor 60 or the motor 120 according to the level of the physique detection signal output from the load sensor 96 or the rotational speed of the spool 18 based on the rotational position detection signal output from the rotation detection sensor 98. Or the driving direction of the motor 60 or motor 120 is appropriately switched, that is, the configuration having the features of both the present invention of claim 1 and the present invention of claim 2 (in other words, the claim (Structure which limited this invention as described in any one of Claim 1 and Claim 2 to this invention described in any other).

  By adopting such a configuration, for example, as shown in FIG. 5, the motor 60 (or the motor 120) is appropriately rotated in the normal direction or the reverse direction so that the rotation on the motor side connecting portion 44 side is restricted. Thus, the amount of energy to be absorbed can be increased or decreased appropriately as compared with the case where the torsion shaft 24 (or the torsion shaft 112) is torsionally deformed.

  In each of the above embodiments, the load sensor 96 is used as one aspect of the occupant physique detection means for detecting the occupant's physique. However, the configuration of the occupant physique detection means is not limited to the load sensor 96. Absent. For example, an imaging means such as a CCD camera is provided in the inner mirror of the vehicle or in the vicinity thereof, and the occupant's physique is determined based on the occupant image captured by the imaging means, and the ECU 90 controls the drive control signal based on the determination result. May be configured to output.

  Further, in each of the above-described embodiments, the occupant physique detection means such as the load sensor 96 is used, and the ECU 90 controls the motor 60 and the motor 120 according to the occupant's physique so that the torsion shaft 24 and the motor 120 are torsionally deformed. For example, the ECU 90 controls the motor 60 and the motor 120 based on the acceleration (deceleration) when the vehicle suddenly decelerates, so that the torsion shaft 24 and the motor 120 A configuration may be employed in which the amount of energy absorbed by torsional deformation is changed.

10 Webbing take-up device 18 Spool 20 Webbing belt 24 Torsion shaft (load absorbing means)
32 Spool side connecting portion 44 Motor side connecting portion (driving means side connecting portion)
60 motor (drive means)
110 Webbing take-up device 112 Torsion shaft (load absorbing means)
120 motor (driving means)

Claims (2)

A spool that is locked on the longitudinal base end side of the long belt-shaped webbing belt, winds the webbing belt from the base end side, and rotates in the pull-out direction when the webbing belt is pulled out;
A load that deforms when the spool side connecting portion rotates relative to the driving means side connecting portion set at a position different from the spool side connecting portion, because the spool side connecting portion is connected to the spool so as not to rotate relative to the spool. Absorption means;
At least one of the case where the vehicle is suddenly decelerated and the spool rotates in the pull-out direction at an acceleration of a predetermined magnitude or more when mechanically connected to the drive means side connecting portion of the load absorbing means Driving means for outputting the driving force at a timing that causes the driving means side coupling portion to rotate in the pull-out direction at a speed slower than the rotation speed of the spool;
A webbing take-up device comprising: A spool that is locked on the longitudinal base end side of the long belt-shaped webbing belt, winds the webbing belt from the base end side, and rotates in the pull-out direction when the webbing belt is pulled out;
A load that deforms when the spool side connecting portion rotates relative to the driving means side connecting portion set at a position different from the spool side connecting portion, because the spool side connecting portion is connected to the spool so as not to rotate relative to the spool. Absorption means;
Mechanically connected to the driving means side connecting portion of the load absorbing means, the spool side connecting portion rotates in the pull-out direction with respect to the driving means side connecting portion, and the load absorbing means is deformed. Driving means for outputting a driving force when rotating the driving means side connecting portion in the winding direction;
A webbing take-up device comprising:

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