JP2009255866A - Webbing take-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a webbing take-up device which does not require rotation of a spool in a drawing direction and regulates rotation of an energy absorbing means such as a torsion bar when the rotation of such a spool is extremely small. <P>SOLUTION: Since transmission of rotation from a worm wheel 66 to a worm gear 116 can not be carried out, in a connection state of an adapter 80 and the worm wheel 66, the other end (connection part 38) of a torsion shaft 32 is held at the worm gear 116 through a sleeve 40, the adapter 80, a pawl 84, and the worm wheel 66 so that rotation is regulated. A webbing belt 22 is not drawn out from the spool 20 till torsion deflection is caused at the shaft body 34 of the torsion shaft 32, and restraining performance of a body of an occupant by the webbing belt 22 is maintained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a webbing take-up device that takes up and stores a webbing belt for restraining the body of an occupant of a vehicle.

  In the seat belt retractor (webbing retractor) disclosed in Patent Document 1 below, when the lock mechanism is activated and the pawl of the lock mechanism engages the internal teeth of the side wall of the frame, the spool is seat belt at one end of the torsion bar. The rotation in the winding direction, which is the rotation direction when winding the (webbing belt), is restricted.

In this state, relative rotation with respect to the spool is restricted on the other end side of the torsion bar, so that the passenger wearing the seat belt pulls the seat belt with a force exceeding the predetermined size, so that the spool has a predetermined size. When a rotational force in the pulling direction exceeding the length (opposite to the winding direction) is applied, twisting occurs between one end and the other end of the torsion bar. The seat belt is pulled out of the spool by this twist, and thus the occupant's body can move forward by the amount of the seat belt pulled out of the spool.
Japanese Patent Application Laid-Open No. 2005-88838

  In the lock mechanism disclosed in Patent Document 1, when the locking base rotates together with the spool and the torsion bar in the pull-out direction while the deceleration sensing means restricts the rotation of the lock gear in the pull-out direction (that is, the lock gear is locked against the lock gear). When the base is relatively rotated in the pull-out direction), the pawl is interlocked with the inner teeth of the side wall of the frame. Therefore, in order for the pawl to engage with the inner teeth of the side wall of the frame, the spool must rotate in the pull-out direction to some extent after the deceleration sensing means senses the sudden deceleration state of the vehicle and restricts the rotation of the lock gear. .

  In consideration of the above facts, the present invention does not require the rotation of the spool in the pull-out direction, or even if the rotation of such a spool is extremely small, the webbing winding that can regulate the rotation of the energy absorbing means such as the torsion bar The purpose is to obtain a take-off device.

  In the webbing take-up device according to the first aspect of the present invention, the base end portion in the longitudinal direction of the long belt-like webbing belt is locked, and the webbing belt is based on the webbing belt by rotating around the axis in one winding direction. A spool that winds up from the end side, and one end side is integrally connected to the spool and rotates together with the spool, and the rotational force of the spool of a certain size or more is transmitted to the one end side while the other end side is held. Energy absorbing means for allowing rotation of the spool while being deformed, driving means for driving when the vehicle suddenly decelerates or when a collision with an obstacle ahead of the vehicle is predicted, and the driving means And a regulating means for regulating rotation of the other end side of the energy absorbing means in the pulling direction opposite to the winding direction when driven by the rotational force when driven. There.

  In the webbing take-up device according to the first aspect of the present invention, the webbing belt drawn out from the spool is hung around the body of the vehicle occupant, so that the webbing belt is attached to the body of the vehicle occupant. . In this state, for example, when the vehicle decelerates suddenly and the occupant's body pulls the webbing belt with the inertia, the occupant's body pulls the webbing belt, and the spool moves in the pull-out direction opposite to the winding direction. A rotational force is applied. Since one end of the energy absorbing means is connected to the spool, the energy absorbing means tries to rotate together with the spool by applying a rotational force in the pulling direction to the spool.

  Here, when the vehicle suddenly decelerates or when it is predicted that the vehicle will collide with an obstacle in front of the vehicle, the driving means is activated and driving force is output from the driving means. . When the driving means is driven in this way, the rotation of the other end side of the energy absorbing means in the drawing direction is restricted by the restricting means. Thereby, in this state, the energy absorbing means and the spool cannot rotate in the pull-out direction.

  However, if the occupant's body pulls the webbing belt with a force of a predetermined magnitude or more and the rotational force transmitted to one end of the energy absorbing means through the spool exceeds a certain magnitude, the rotation is restricted by the regulating means. The energy absorbing means is deformed between the other end side and one end side where the rotational force is transmitted. In response to this deformation, rotation of the spool in the pull-out direction, that is, pulling-out of the webbing belt from the spool is allowed, and the occupant's body can move toward the front of the vehicle by the amount that the webbing belt is pulled out.

  Here, in the webbing take-up device according to the present invention, when the driving force is output from the driving unit, the rotation of the energy absorbing unit in the pull-out direction is regulated by the regulating unit. When regulation is started, rotation of the spool in the pull-out direction is not required. For this reason, the restraining performance by a webbing belt until rotation regulation of an energy absorption means is started can be maintained.

The webbing retractor according to the present invention as set forth in claim 2 is the present invention as set forth in claim 1,
Drive means interlocking regulation that is actuated by receiving the driving force of the drive means and mechanically connected to the other end side of the energy absorbing means to restrict the other end side of the energy absorbing means from rotating in the pull-out direction. The restriction means is configured including the mechanism.

  In the webbing take-up device according to the second aspect of the present invention, when the vehicle suddenly decelerates or when it is predicted that the vehicle will collide with an obstacle in front of the vehicle, the driving means is activated. When the driving force is output from the driving means, the driving means interlocking regulation mechanism operates by receiving the driving force of the driving means. In this way, when the drive means interlocking regulation mechanism is activated, the drive means interlocking regulation mechanism is directly or indirectly mechanically coupled to the other end side of the energy absorbing means. In this way, the drive means interlocking regulation mechanism is mechanically coupled to the other end side of the energy absorbing means, thereby restricting the rotation of the other end side of the energy absorbing means in the drawing direction.

  A webbing take-up device according to a third aspect of the present invention is the webbing retractor according to the second aspect, wherein the driving means interlocking regulation mechanism is moved to the other end side of the energy absorbing means by a driving force in the forward rotation direction. A motor that mechanically connects and cancels the mechanical connection between the driving means interlocking regulation mechanism and the energy absorbing means by a driving force in the reverse rotation direction is used as the driving means.

  In the webbing take-up device according to the third aspect of the present invention, when the motor as the driving means is operated and the normal driving force is output from the motor, the driving means interlocking regulating mechanism is the other end side of the energy absorbing means. Directly or indirectly and mechanically. Therefore, when a rotational force in the pulling direction exceeding a certain size is applied to the spool in this state, the other end connected to the drive means interlocking regulation mechanism and one end to which the rotational force in the pulling direction is applied. The energy absorbing means is deformed between the sides.

  On the other hand, in the state where the driving means interlocking regulation mechanism and the other end side of the energy absorbing means are mechanically connected, for example, when the vehicle suddenly decelerates as a result or a vehicle collision is avoided. In this case, when the motor is driven in reverse, the mechanical connection between the driving means interlocking regulation mechanism and the other end side of the energy absorbing means is canceled. For this reason, as a result, the vehicle does not suddenly decelerate, and if the vehicle returns to the normal state, the webbing belt can be pulled out as usual.

  Thus, in the webbing take-up device according to the present invention, the mechanical connection between the driving means interlocking regulation mechanism and the energy absorbing means and the cancellation thereof are performed by forward and reverse rotation of the motor, so that the control is simple.

  A webbing take-up device according to a fourth aspect of the present invention is the webbing retractor according to the third aspect of the present invention, wherein the driving force of the motor in the forward rotation direction causes the driving means interlocking regulation mechanism and the energy absorbing means to The direction of the driving force when transmitted to the spool through the winding direction is set to the winding direction.

  In the webbing take-up device according to the fourth aspect of the present invention, when the motor as the drive means is driven to rotate forward, the drive means interlocking regulation mechanism and the energy absorbing means are connected. Further, the forward driving force of the motor is transmitted to the spool via the driving means interlocking regulation mechanism and the energy absorbing means, and rotates the spool in the winding direction.

  As a result, the slight slack of the webbing belt attached to the occupant's body, so-called “slack”, is eliminated. Thus, in the webbing retractor according to the present invention, the occupant's body can be sufficiently restrained by the webbing belt before the energy absorbing means is deformed.

  A webbing take-up device according to a fifth aspect of the present invention is the first aspect of the present invention according to the third or fourth aspect, wherein the first rotating body is integrally attached to the other end side of the energy absorbing means. A second rotating body coaxially rotatable with respect to the first rotating body, a driving force of the motor being transmitted to the second rotating body, and rotation of the second rotating body with respect to the motor A driving force transmitting means that is unable to transmit the motor, and mechanically connecting the second rotating body to the first rotating body when the driving force of the motor in the forward rotation direction is transmitted and the second rotating body rotates. The drive means interlocking regulation mechanism is configured to include the connecting means to perform.

  In the webbing take-up device according to the fifth aspect of the present invention, when the motor as the drive means is driven forward, the forward drive force is transmitted to the second rotating body constituting the drive means interlocking regulation mechanism, and the second Rotate the rotating body in the forward direction. When the second rotating body rotates in the forward rotation direction in this way, the connecting means provided on the second rotating body is connected to the first rotating body that constitutes the drive means interlocking regulation mechanism together with the second rotating body and the connecting means. . Thus, in the webbing take-up device according to the present invention, the restricting means is connected to the other end side of the energy absorbing means.

  On the other hand, in a state where the connecting means does not connect the second rotating body to the first rotating body, the second rotating body can rotate relative to the first rotating body on the same axis, and thus is connected to the energy absorbing means. The 1st rotary body currently made can rotate freely with a spool and energy absorption means. Therefore, the webbing belt can be pulled out in a state where the connecting means does not connect the second rotating body to the first rotating body.

  A webbing take-up device according to a sixth aspect of the present invention is the webbing take-up device according to the fifth aspect of the present invention, wherein the worm gear is rotated by the driving force of the motor, and the rotational force of the worm gear is transmitted to the worm gear. And a worm wheel that transmits a rotational force transmitted from the worm gear to the first rotating body in a connected state of the first rotating body and the second rotating body by the connecting means. It constitutes a regulation mechanism.

  In the webbing take-up device according to the sixth aspect of the present invention, when the worm gear constituting the drive means interlocking regulation mechanism is rotated by the driving force of the motor, the rotational force of the worm gear is transmitted to the worm wheel meshing with the worm gear. The wheel rotates. Furthermore, if the 1st rotary body and the 2nd rotary body are connected, rotation of a worm wheel will be transmitted to a 1st rotary body. Therefore, when a rotational force in the pull-out direction is applied to the spool in a connected state between the first rotating body and the second rotating body, the rotating force is transmitted to the worm wheel.

  However, the rotation of the worm gear can be basically transmitted to the worm wheel to rotate the worm wheel, but the rotation of the worm wheel cannot be transmitted to the worm gear to rotate the worm gear. Therefore, as described above, even if the worm wheel tries to rotate with the rotational force input to the spool, the worm gear regulates the rotation of the worm wheel.

  As a result, the other end side of the energy absorbing means resists this rotation with respect to the one end side of the energy absorbing means that attempts to rotate together with the spool, so that the other end side of the energy absorbing means is substantially held.

  A webbing retractor according to a seventh aspect of the present invention is the webbing retractor according to the first aspect of the present invention, wherein the vehicle suddenly decelerates or the vehicle collides with the obstacle in the driving state of the driving means. When the body of the occupant pulls the webbing belt with the inertia, the driving means applies a rotational force in the winding direction that is greater than the rotational force in the pull-out direction applied to the energy absorbing means. The ebbing take-up device according to claim 1.

  In the webbing retractor according to the seventh aspect of the present invention, when the vehicle suddenly decelerates or when it is predicted that the vehicle will collide with an obstacle in front of the vehicle, the driving means is operated. To do. When the driving means is operated and a driving force is output from the driving means, this driving force is applied to the other end side of the energy absorbing means as a rotational force in the winding direction.

  Here, the rotational force in the winding direction applied to the other end side of the energy absorbing means as described above (that is, the driving force output from the driving means) is caused by the vehicle suddenly decelerating or when the vehicle is in an obstacle. It is greater than the rotational force in the pull-out direction applied to the energy absorbing means when the occupant's body pulls the webbing belt due to the inertia of the collision.

  For this reason, even when the vehicle suddenly decelerates or when the vehicle collides with an obstacle, the occupant's body pulls the webbing belt and applies a rotational force in the pull-out direction to one end side of the energy absorbing means. Since the rotational force in the winding direction that resists this is applied to one end side of the energy absorbing means, the energy absorbing means is held.

  A webbing take-up device according to an eighth aspect of the present invention is the webbing retractor according to the first aspect of the present invention, wherein the webbing take-up device is directly or indirectly and mechanically connected to the other end of the energy absorbing means. A restriction member for restricting rotation of the other end side of the energy absorbing means in the pull-out direction; and driving at a predetermined timing corresponding to a drive start timing of the drive means; And a restricting member driving means to be connected to the other end side of the member.

  In the webbing retractor according to the eighth aspect of the present invention, when the vehicle suddenly decelerates or when it is predicted that the vehicle will collide with an obstacle in front of the vehicle, the driving means is activated. To do. When the driving means is operated and a driving force is output from the driving means, this driving force is applied to the other end side of the energy absorbing means as a rotational force in the winding direction.

  On the other hand, when the drive means starts to be driven in this way, the regulating member drive means is driven at a predetermined timing corresponding to the drive start timing of the drive means. When the restricting member driving means is driven, the restricting member is directly or indirectly mechanically connected to the other end side of the energy absorbing means by this driving force. Thereby, rotation in the pull-out direction is restricted on the other end side of the energy absorbing means.

  A webbing take-up device according to a ninth aspect of the present invention is the webbing take-up device according to the first aspect of the present invention according to any one of the first to seventh aspects, including other vehicles that run in front of the vehicle. Control means for driving the driving means when the distance to the obstacle existing ahead reaches a predetermined value is provided.

  In the webbing retractor according to the ninth aspect of the present invention, the distance to the obstacle existing in front of the vehicle (own vehicle) including other vehicles traveling in front of the vehicle (own vehicle) is predetermined. When the value is less than the value, the driving means is activated, and the energy absorbing means and the regulating means are connected by the driving force of the driving means. For this reason, even when the distance to the obstacle is further reduced and the vehicle decelerates rapidly, the other end of the energy absorbing means is already held, so that the occupant's body exceeds the predetermined size in this state. If the webbing belt is pulled with a strong force, the energy absorbing means is quickly deformed.

  As described above, the webbing take-up device according to the present invention does not require rotation of the spool in the pull-out direction, or rotation of energy absorbing means such as a torsion bar even if such spool rotation is extremely small. Can be regulated.

<Configuration of First Embodiment>
FIG. 1 is a front sectional view showing an outline of the entire configuration of a webbing take-up device 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. The frame 12 includes a flat plate 14. The back plate 14 is fixed to the vehicle body by fastening means (not shown) such as a bolt, for example, in the vicinity of the lower end of the center pillar of the vehicle. The taking device 10 is attached to the vehicle body.

  From both ends in the width direction of the back plate 14, a pair of leg plates 16 and 18 facing each other substantially in the vehicle front-rear direction are extended in parallel to each other. A substantially cylindrical spool 20 is disposed between the leg plates 16 and 18.

  The spool 20 has an axial direction opposite to the leg plates 16 and 18 and is rotatable around its own axis. Further, the longitudinal base end portion of the long belt-like webbing belt 22 is locked to the spool 20.

  The webbing belt 22 is wound around the outer peripheral portion of the spool 20 in the form of a layer from the base end side and stored by rotating the spool 20 in a winding direction around one of its axes. Further, when the webbing belt 22 is pulled from the front end side, the webbing belt 22 wound around the spool 20 is pulled out, and accordingly, the spool 20 rotates in a pulling direction opposite to the winding direction.

  Further, the webbing take-up device 10 includes a force limiter mechanism 30. The force limiter mechanism 30 includes a torsion shaft 32 as energy absorbing means disposed inside the spool 20. The torsion shaft 32 includes a shaft body 34. The shaft body 34 is formed in a rod shape whose axial direction is along the axial direction of the spool 20. A coupling portion 36 is formed at the end of the shaft body 34 on the leg plate 16 side. The coupling portion 36 is knurled on the outer peripheral portion, or the outer peripheral shape is non-circular, so that the relative rotation of the torsion shaft 32 with respect to the spool 20 around the central axis of the spool 20 is impossible. It is said that.

  In contrast, a coupling portion 38 is formed at the end of the shaft body 34 on the leg plate 18 side. The coupling portion 38 is knurled on the outer peripheral portion or has a non-circular outer peripheral shape. A sleeve 40 is attached to the coupling portion 38 in a state where relative rotation with respect to the coupling portion 38 around the central axis of the spool 20 is impossible. At least a part of the sleeve 40 is fitted into the spool 20 from the opening end of the spool 20 on the leg plate 18 side.

  The outer peripheral shape of the sleeve 40 at the portion inserted into the spool 20 is a circular shape that is coaxial with both the shaft body 34 of the torsion shaft 32 and the spool 20. Therefore, although the sleeve 40 itself can be rotated relative to the spool 20 around the central axis of the spool 20, the torsion shaft 32 to which the sleeve 40 is coupled cannot be rotated relative to the spool 20. The sleeve 40 is integrally connected to the spool 20.

  On the outside of the leg plate 16 (on the side opposite to the leg plate 18 of the leg plate 16), a spring case 42 is attached to the leg plate 16. A spiral spring 44 is accommodated in the spring case 42. The end of the spiral spring 44 on the outer side in the spiral direction is locked to the spring case 42. On the other hand, the end of the spiral spring 44 on the inner side in the spiral direction is locked to the adapter 46. The adapter 46 is coaxially connected to one end portion of the torsion shaft 32 that passes through the leg plate 16 and protrudes to the outside of the frame 12 and is connected to the torsion shaft 32 in a state where relative rotation around the center axis of the torsion shaft 32 is impossible. Yes.

  The spiral spring 44 is tightened when the torsion shaft 32 rotates in the pull-out direction, and the urging force increases. Therefore, when the webbing belt 22 is pulled out from the spool 20 and the spool 20 rotates in the pull-out direction, the spiral spring 44 biases the spool 20 in the winding direction via the torsion shaft 32. The webbing belt 22 in which the occupant's body is not worn is wound around the spool 20 by the urging force of the spiral spring 44 and stored.

  On the other hand, the housing 50 of the lock mechanism 48 is attached to the leg plate 18 on the outside of the leg plate 18 (on the side opposite to the leg plate 16 of the leg plate 18). The lock mechanism 48 includes a lock base 52. The lock base 52 is disposed coaxially with the spool 20 on the side of the spool 20. Further, the lock base 52 is attached to the sleeve 40 so as not to rotate relative to the sleeve 40 around the central axis of the torsion shaft 32. For this reason, the sleeve 40 basically rotates together with the spool 20.

  A lock pawl 54 that constitutes the lock mechanism 48 together with the lock base 52 is disposed on the side of the lock base 52 along the rotational radius direction of the lock base 52. The lock pawl 54 is rotatable about an axis whose axial direction is the same as the direction of the center axis of the spool 20. When the lock pawl 54 is rotated about one axis, the lock pawl 54 is formed on the outer periphery of the lock base 52. approach. Thus, the lock pawl 54 approaching the outer periphery of the lock base 52 can mesh with ratchet teeth formed on the outer periphery of the lock base 52. When the lock pawl 54 is engaged with the ratchet teeth of the lock base 52, the rotation of the lock base 52 in the pull-out direction, and thus the rotation of the torsion shaft 32 and the spool 20 in the pull-out direction is restricted.

  Various components constituting the lock mechanism 48 are housed inside the housing 50, and the lock mechanism 48 is activated when the vehicle is suddenly decelerated or when the spool 20 is suddenly rotated in the pull-out direction. After a slight rotation of the spool 20 in the pull-out direction, the lock pawl 54 is brought close to the outer periphery of the lock base 52.

  On the other hand, a clutch housing 60 is attached to the leg plate 18 between the housing 50 and the leg plate 18. Inside the clutch housing 60, a clutch 64 constituting a driving force transmission mechanism 62 constituting a restricting means is provided as a drive means interlocking restricting mechanism. The clutch 64 includes a worm wheel 66 that constitutes a restricting means as a second rotating body. As shown in FIG. 2, a disc-shaped bottom wall 68 is provided. From the outer peripheral portion of the bottom wall 68, a peripheral wall 70 having external teeth formed on the outer peripheral portion is erected in one axial direction of the bottom wall 68, and the worm wheel 66 has a shallow basin shape or axial dimension as a whole. It is formed in a short bottomed cylindrical shape.

  A through hole (not shown) is formed in the center of the bottom wall 68, and a shaft portion 74 that protrudes coaxially with respect to the spool 20 from the sleeve 40 passes therethrough. Thereby, the worm wheel 66 is rotatably supported by the shaft portion 74.

  Inside the worm wheel 66, an adapter 80 constituting a restricting means is arranged as a first rotating body. The adapter 80 is attached to the shaft portion 74 in a state where relative rotation with respect to the shaft portion 74 is impossible. The main body portion of the adapter 80 has a cylindrical shape that is coaxial with the shaft portion 74, but a plurality of connecting teeth 82 project from the outer peripheral portion of the main body portion of the adapter 80. These connecting teeth 82 are formed around the central axis of the adapter 80 at fixed angles. The distal end sides of these connecting teeth 82 are inclined from the portion connected to the main body portion of the adapter 80 toward the winding direction side with respect to the outer side in the radial direction of rotation of the adapter 80. Therefore, the connecting teeth 82 are partially The adapter 80 faces the outer peripheral portion of the main body portion of the adapter 80 via a gap along the radial direction of rotation of the adapter 80.

  On the side of the adapter 80 along the radial direction of the adapter 80, a pair of pawls 84 are provided as restricting means as connecting means. These pawls 84 are arranged so as to face each other through the adapter 80. Corresponding to each of these pawls 84, support shafts 86 are formed so as to protrude from the bottom wall 68. The axial directions of these support shafts 86 are the same as the axial direction of the spool 20, and pawls 84 are rotatably supported on the respective support shafts 86.

  Thus, the pawl 84 supported by each support shaft 86 is rotated around the support shaft 86 (the arrow in FIG. 2) when the worm wheel 66 rotates in the winding direction (the direction of arrow A1 in FIG. 2) at a certain speed or higher. B1 direction), and the tip side approaches the outer peripheral portion of the adapter 80. In this way, the tip of the pawl 84 approaching the outer periphery of the adapter 80 abuts against the connecting teeth 82 as shown in FIG. 3, and when the worm wheel 66 further rotates in the winding direction in this state, The tip slides on the connecting tooth 82 and enters the space between the tip side of the connecting tooth 82 and the outer peripheral portion of the main body portion of the adapter 80 as shown in FIG. When the pawl 84 is connected to the adapter 80 in this way and rotates in the winding direction of the worm wheel 66, the pawl 84 that rotates in the winding direction together with the worm wheel 66 presses the adapter 80 in the winding direction to 80 is rotated in the winding direction (the direction of arrow C1 in FIG. 4).

  The support shaft 86 is provided with a torsion coil spring 88 as a releasing means. One end of the torsion coil spring 88 is locked to the bottom wall 68, and the other end is locked to the pawl 84. When the pawl 84 rotates in a direction in which the tip end side of the pawl 84 approaches the outer peripheral portion of the adapter 80, the torsion coil spring 88 is wound and tightened to separate the tip end side of the pawl 84 from the outer peripheral portion of the adapter 80 (see FIG. The pawl 84 is urged in the direction of arrow B2 in FIG.

  As described above, the pawl 84 is rotated in the direction away from the outer peripheral portion of the adapter 80 by the biasing force of the torsion coil spring 88, so that the connection between the worm wheel 66 and the adapter 80 is eliminated. As described above, in the portion of the adapter 80 where the pawl 84 is engaged, the main body portion of the adapter 80 and a part of the coupling tooth 82 are opposed to each other with a gap along the rotational radius direction of the adapter 80.

  For this reason, in the state where the tip end of the pawl 84 enters the gap, the tip end side of the pawl 84 interferes with the connecting teeth 82 even if the pawl 84 is rotated by the urging force of the torsion coil spring 88. Cannot rotate. In other words, in a state where the pawl 84 is engaged with the adapter 80, the pawl 84 is oriented in such a direction as to cancel the connection with the adapter 80 unless the worm wheel 66 rotates relative to the adapter 80 in the pull-out direction (arrow A2 direction in FIG. 4). Cannot be rotated.

  On the other hand, as shown in FIG. 1, a motor 100 as a driving unit is provided between the leg plate 16 and the leg plate 18 of the frame 12 and below the spool 20. The motor 100 is on the opening direction side of the frame 12 in which the output shaft 102 has a substantially concave shape in plan view, that is, on the extending direction side of the leg plates 16 and 18 from the back plate 14, and the tip side thereof is the above clutch. It enters into a gear case (not shown) different from the housing 60.

  A flat toothed external gear 104 is accommodated in the gear case. The gear 104 is coaxially and integrally attached to the output shaft 102. A gear 106 having external teeth and spur teeth with a sufficiently larger number of teeth than that of the gear 104 is arranged on the side of the rotation radius direction of the gear 104 in the gear case. The gear 106 has a rotating shaft 108 in the same direction as the gear 104, and meshes with the gear 104.

  Further, a spur gear 110 having a sufficiently smaller number of teeth than the gear 106 is coaxially and integrally formed on the gear 106. Further, a spur gear 112 having a sufficiently larger number of teeth than the gear 110 is disposed on the side of the gear 110 in the radial direction of rotation in the gear case. The gear 112 has a rotating shaft 114 in the same direction as the gears 104 to 112 and meshes with the gear 110. Further, the rotating shaft 114 of the gear 112 protrudes from the gear case and further enters the clutch housing 60.

  In the clutch housing 60, a worm gear 116 is provided coaxially and integrally with the rotating shaft 114. The worm gear 116 meshes with the worm wheel 66, and the rotation of the output shaft 102 of the motor 100 is transmitted to the worm gear 116 via the gears 104 to 112, and when the worm gear 116 rotates, the rotation of the worm gear 116 is applied to the worm wheel 66. As a result, the worm wheel 66 rotates.

  On the other hand, the motor 100 is electrically connected to the battery 124 via the driver 122, and the motor 100 is driven to rotate forward when a forward current flows through the driver 122, thereby causing the output shaft 102 to rotate forward. When the current in the reverse direction is applied, the output shaft 102 is reversely driven to reverse the output shaft 102. The driver 122 is electrically connected to an ECU 126 as control means, and a drive current is passed through the motor 100 based on a motor drive control signal from the ECU 126.

  The ECU 126 is connected to a forward monitoring device 128 as detection means provided in the vehicle. A monitoring signal is output from the front monitoring device 128, and this monitoring signal is input to the ECU 126. The front monitoring device 128 outputs monitoring signals having different levels depending on whether the distance to an obstacle in front of the vehicle including other vehicles traveling in front of the vehicle is a certain distance or more and less than a certain distance.

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

  In the webbing retractor 10, the distance to the obstacle ahead of the traveling vehicle is less than a certain value in a state where the webbing belt 22 pulled out from the spool 20 is attached to the occupant's body. When the forward monitoring device 128 detects and a detection signal at this time is input to the ECU 126, the driver 122 causes the motor 100 to pass a forward drive current based on the motor drive control signal output from the ECU 126. Thus, when the motor 100 is driven and the output shaft 102 rotates in the forward direction, the forward rotation of the output shaft 102 is transmitted to the worm gear 116 via the gears 104 to 112, and the worm gear 116 is rotated in the forward direction.

  Further, the rotation of the worm gear 116 is transmitted to the worm wheel 66 meshing with the worm gear 116, and the worm wheel 66 is rotated in the winding direction (the direction of arrow A1 in FIG. 2). When the worm wheel 66 rotates in the winding direction, the pawl 84 of the clutch 64 rotates around the support shaft 86 in the direction of the arrow B1 in FIG. 2, so that the tip of the pawl 84 approaches the outer peripheral portion of the adapter 80. When the tip end of the pawl 84 approaches the outer peripheral portion of the adapter 80 in this way, the tip end of the pawl 84 comes into contact with the connecting teeth 82 as shown in FIG.

  When the worm wheel 66 is further rotated in the winding direction in this state, the tip end of the pawl 84 slides on the connecting tooth 82, and the outer end portion of the main body portion of the adapter 80 and the tip end side of the adapter 80 as shown in FIG. Get into the gap between. Thereby, the worm wheel 66 is connected to the adapter 80 via the pawl 84. In this state, when the worm wheel 66 is rotated in the winding direction, the pawl 84 that rotates in the winding direction together with the worm wheel 66 presses the adapter 80 in the winding direction, so that the adapter 80 is wound in the winding direction (arrow C1 in FIG. 2). Direction).

  The adapter 80 is attached to the shaft portion 74 of the sleeve 40 in a state where relative rotation is impossible, and the sleeve 40 is attached to the coupling portion 38 at the other end of the torsion shaft 32 in a state where relative rotation is not possible. Further, the coupling portion 36 at one end of the torsion shaft 32 is connected to the spool 20 in a state in which it cannot rotate relative to the spool 20. For this reason, when the adapter 80 is rotated in the winding direction as described above, the spool 20 is rotated in the winding direction, so that loosening of the webbing belt 22 attached to the body of the occupant, so-called “slack”, occurs. It will be resolved. As a result, the occupant's body is firmly restrained by the webbing belt 22.

  In this state, for example, there are no obstacles in front of the vehicle due to the steering operation of the occupant, or the distance to the obstacle in front of the vehicle traveling by the brake operation of the occupant is long, As a result, when the forward monitoring device 128 detects that the distance to the obstacle in front of the traveling vehicle has changed to a certain value or more, the driver 122 based on the motor drive control signal output from the ECU 126 at this time. A reverse drive current is passed through the motor 100.

  When the motor 100 is driven in the reverse direction, the output shaft 102, the gears 104 to 112, and the worm gear 116 are rotated in the opposite direction to the case where the motor 100 is driven in the forward direction, whereby the worm wheel 66 is pulled out (arrow A2 in FIG. 4). Direction). When the pawl 84 rotates together with the worm wheel 66 in the pull-out direction (the direction of arrow B2 in FIG. 4), the tip of the pawl 84 comes out from the gap between the tip side of the connecting tooth 82 and the outer peripheral portion of the main body portion of the adapter 80. As a result, the pawl 84 from which the interference from the distal end side of the coupling tooth 82 has been eliminated rotates around the support shaft 86 in a direction away from the outer peripheral portion of the adapter 80 by the urging force of the torsion coil spring 88. By rotating the pawl 84 in this manner, the connection between the adapter 80 and the pawl 84, and the connection between the adapter 80 and the worm wheel 66 is canceled.

  On the other hand, when the vehicle suddenly decelerates with the adapter 80 and the worm wheel 66 connected, the occupant's body tends to move inertially toward the front side of the vehicle. The occupant's body trying to move to the front side of the vehicle pulls the webbing belt 22 attached to the occupant's body abruptly. When the webbing belt 22 is pulled abruptly, a rotational force in the pull-out direction is input to the spool 20. The drawing direction rotational force input to the spool 20 is input to the worm wheel 66 via the torsion shaft 32, the sleeve 40, the adapter 80, and the pawl 84.

  Here, the rotational force transmission mechanism composed of the worm wheel 66 and the worm gear 116 can transmit the rotational force of the worm gear 116 to the worm wheel 66 to rotate the worm wheel 66. Cannot be transmitted to the worm gear 116 to rotate the worm gear 116. For this reason, even if the occupant's body pulls the webbing belt 22 while the adapter 80 and the worm wheel 66 are connected, the spool 20 cannot be rotated in the pull-out direction, so the webbing belt 22 cannot be pulled out from the spool 20. As a result, the occupant's body cannot move inertially toward the front side of the vehicle.

  As described above, in the connected state of the adapter 80 and the worm wheel 66, the other end portion (the coupling portion 38) of the torsion shaft 32 is held by the worm gear 116 via the sleeve 40, the adapter 80, the pawl 84, and the worm wheel 66. Therefore, rotation is restricted.

  In this state, when the occupant's body pulls the webbing belt 22, the rotational force in the pull-out direction applied to one end portion (coupling portion 36) of the torsion shaft 32 via the spool 20 is the shaft main body 34 of the torsion shaft 32. When the mechanical strength of the torsion shaft 32 is exceeded, torsional deformation occurs in the shaft main body 34 so that one end portion (coupling portion 36) of the torsion shaft 32 rotates in the pull-out direction with respect to the other end portion (coupling portion 38). The spool 20 is allowed to rotate in the pull-out direction by the amount of torsional deformation of the shaft body 34. The webbing belt 22 is pulled out from the spool 20 by the amount of rotation of the spool 20 in the pull-out direction, and the occupant's body can move to the front side of the vehicle by the length of the webbing belt 22 pulled out from the spool 20. Energy is absorbed by the torsional deformation that occurs.

  Here, as described above, when the worm wheel 66 is rotated in the pull-out direction by the driving force of the motor 100 and the pawl 84 is engaged with the connecting teeth 82 of the adapter 80, the spool 20 does not rotate in the pull-out direction. Even so, the other end of the torsion shaft 32 is held and its rotation is restricted. For this reason, the webbing belt 22 is not pulled out from the spool 20 until torsional deformation occurs in the shaft body 34 of the torsion shaft 32, and the restraining performance of the occupant's body by the webbing belt 22 can be maintained.

  Moreover, as described above, the rotational force transmission mechanism by the worm gear 116 and the worm wheel 66 transmits the rotational force of the motor 100 to the spool 20 to eliminate slack and restrict rotation of the other end of the torsion shaft 32. The configuration is simple, and furthermore, the connection between the worm wheel 66 and the adapter 80 is eliminated by simply rotating the motor 100 in the reverse direction, and the spool 20 can be rotated as usual, so that the control is simple.

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

  FIG. 5 is a front sectional view showing the configuration of a webbing take-up device 170 according to the second embodiment of the present invention. As shown in this figure, the webbing retractor 170 does not include the clutch 64 but instead includes the clutch 172. The clutch 172 does not include the worm wheel 66 but includes a clutch gear 174 instead. The clutch gear 174 includes a peripheral wall 176 instead of the peripheral wall 70 of the worm wheel 66. Unlike the peripheral wall 70, the peripheral wall 176 has an outer peripheral portion with external teeth and a spur gear. Similarly to the worm wheel 66, the peripheral wall 176 is also provided on the inner side so as to be able to rotate in a direction in which the pawl 84 contacts and separates from the connecting teeth 82 of the adapter 80 (that is, the clutch gear 174 has a flat tooth on the peripheral wall 176. The clutch housing 60 basically has the same configuration except that the gear is a gear).

  Further, the webbing take-up device 170 does not include the driving force transmission mechanism 62 but includes a driving force transmission mechanism 180 instead. The driving force transmission mechanism 180 includes gears 104 to 112 provided integrally with the output shaft 102. However, although the gears 104 to 112 in the first embodiment are along the direction in which the axial direction thereof is substantially orthogonal to the axial direction of the spool 20, the driving force transmission mechanism 180 has the gears 104 to 112. Is the same direction as the axial direction of the spool 20.

  Further, the driving force transmission mechanism 180 is not provided with the worm gear 116 on the rotating shaft 114, and instead, the externally toothed spur gear 182 having a smaller number of teeth than the gear 112 is coaxial with the rotating shaft 114. It is attached integrally. The gear 182 meshes with external teeth formed on the peripheral wall 176 of the clutch gear 174. Accordingly, the driving force of the motor 100 can be transmitted to the clutch gear 174 via the driving force transmission mechanism 180 to rotate the clutch gear 174.

  Further, the webbing take-up device 170 does not include the ECU 126, but instead includes an ECU 190 as a control means. The ECU 190 is connected to the driver 122, and the ECU 190 is the same as the ECU 126 in that the driver 122 causes a drive current to flow to the motor 100 based on the output motor drive control signal. However, the ECU 190 in the present embodiment differs in the magnitude of the current that the driver 122 sends to the motor 100 based on the motor drive control signal, and the vehicle is suddenly decelerated and the occupant moves inertially to the front side of the vehicle. Thus, the ECU 190 outputs a motor drive control signal so that the motor 100 outputs a driving force that can resist the rotational force of the spool 20 in the pull-out direction when the webbing belt 22 is pulled on the body of the occupant.

<Operation and Effect of Second Embodiment>
Next, the operation and effect of the webbing take-up device 170 will be described through the operation of the webbing take-up device 170.

  In the webbing take-up device 170, the distance to the obstacle in front of the running vehicle is less than a certain value in a state where the webbing belt 22 pulled out from the spool 20 is attached to the body of the occupant. When the forward monitoring device 128 detects and a detection signal at this time is input to the ECU 190, the driver 122 causes the motor 100 to pass a forward drive current based on the motor drive control signal output from the ECU 190.

  When the motor 100 is driven and the output shaft 102 rotates in the forward direction, the forward rotation of the output shaft 102 is transmitted to the clutch gear 174 through the gears 104 to 112 and the gear 182 to rotate the clutch gear 174 in the forward direction. As the clutch gear 174 rotates forward, the tip of the pawl 84 meshes with the connecting teeth 82 of the adapter 80 as in the first embodiment, and the forward rotation of the clutch gear 174 is performed via the sleeve 40 and the torsion shaft 32. Thus, the spool 20 is rotated in the winding direction. As a result, the “slack” described above is eliminated and the occupant's body is firmly restrained by the webbing belt 22.

  Further, in this state, when the vehicle suddenly decelerates due to a sudden braking operation by the occupant or the vehicle colliding with an obstacle, the occupant's body tends to move inertially toward the front side of the vehicle. When the occupant's body suddenly pulls the webbing belt 22 due to the inertial movement of the occupant, the webbing belt 22 rapidly rotates the force limiter mechanism 30 in the pull-out direction. Here, the forward driving force output from the ECU 190 that is normally driven based on the motor drive control signal from the ECU 190 causes the webbing belt 22 to suddenly pull on the body of the occupant who moves inertially toward the front side of the vehicle. The spool 20 has a size that can resist the rotational force of the spool 20 in the pull-out direction.

  Therefore, in this state, even if the occupant's body pulls the webbing belt 22, the spool 20 cannot be rotated in the pull-out direction, so the webbing belt 22 cannot be pulled out from the spool 20, and as a result, the occupant's body Inertial movement to the front side of the vehicle is not possible. Thus, in this state, the other end portion (the coupling portion 38) of the torsion shaft 32 is held by the clutch 172 that receives the driving force of the motor 100, and the rotation is restricted.

  In this state, when the occupant's body pulls the webbing belt 22, the rotational force in the pull-out direction applied to one end portion (coupling portion 36) of the torsion shaft 32 via the spool 20 is the shaft main body 34 of the torsion shaft 32. When the mechanical strength of the torsion shaft 32 is exceeded, torsional deformation occurs in the shaft main body 34 so that one end portion (coupling portion 36) of the torsion shaft 32 rotates in the pull-out direction with respect to the other end portion (coupling portion 38). The spool 20 is allowed to rotate in the pull-out direction by the amount of torsional deformation of the shaft body 34. The webbing belt 22 is pulled out from the spool 20 by the amount of rotation of the spool 20 in the pull-out direction, and the occupant's body can move to the front side of the vehicle by the length of the webbing belt 22 pulled out from the spool 20. Energy is absorbed by the torsional deformation that occurs.

  Here, as described above, the clutch 172 that has received the normal driving force of the motor 100 restricts the rotation of the other end of the torsion shaft 32 in the pull-out direction by the rotational force based on the driving force of the motor 100. The webbing belt 22 is not pulled out of the spool 20 until the shaft body 34 of the torsion shaft 32 is torsionally deformed, and the restraining performance of the occupant's body by the webbing belt 22 can be maintained.

  In addition, as described above, the driving force transmission mechanism 180 transmits the rotational force of the motor 100 to the spool 20 to eliminate the slack and restrict the rotation of the other end of the torsion shaft 32. By simply rotating the motor 100 in the reverse direction, the connection between the worm wheel 66 and the adapter 80 is canceled and the spool 20 can be rotated as usual, so that the control is simple.

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

  FIG. 6 is a front sectional view showing the configuration of the webbing take-up device 210 according to the present embodiment. As shown in this figure, the webbing retractor 210 does not include the clutch 172 but instead includes the clutch 212. The clutch 212 does not include the clutch gear 174 but instead includes the clutch gear 214. The clutch gear 214 has basically the same configuration as the clutch gear 174, but differs in configuration from the clutch gear 174 in that a ratchet plate 216 is provided coaxially and integrally on the surface opposite to the leg plate 18. .

  As shown in FIG. 7, the ratchet plate 216 is a plate-like member having ratchet teeth 218 formed on the outer peripheral portion in the same manner as the lock base 52, and a restricting means is provided as a restricting member on the side of the rotation radius direction of the ratchet plate 216. A constituting pawl 222 is provided. The pawl 222 is rotatably supported by a shaft 224 whose axial direction is the same as the axial direction of the force limiter mechanism 30. One side of the pawl 222 with the portion supported by the shaft 224 as a boundary serves as a meshing portion 226, and when the pawl 222 rotates to one side around the shaft 224, the tip side approaches the outer peripheral portion of the ratchet plate 216. Then, it meshes with the ratchet teeth 218 of the ratchet plate 216.

  When the meshing portion 226 meshes with the ratchet teeth 218 of the ratchet plate 216, the rotation of the ratchet plate 216 in the pull-out direction is restricted, but when the ratchet plate 216 rotates in the winding direction, the slope of the ratchet teeth 218 Since the meshing portion 226 is pushed up and the meshing portion 226 is meshed again with the ratchet teeth 218 adjacent on the drawing direction side, the rotation of the ratchet plate 216 in the winding direction side is not restricted.

  On the other hand, the other side of the pawl 222 with the portion supported by the shaft 224 as a boundary is a connecting portion 228. The tip of the wire rod 230 is connected to the connecting portion 228. On the proximal end side of the wire rod 230, a housing 242 of a solenoid unit 240 constituting a restricting means as a restricting member driving means is provided. A solenoid that forms a magnetic field around it when energized is housed inside the housing 242. In addition, the housing 242 is provided with a plunger 244 formed of a metal into a rod shape. Plunger 244 is housed in housing 242 at the base end side relative to the middle portion in the longitudinal direction. When a solenoid in housing 242 is energized and a magnetic field is formed around the solenoid, plunger 244 is attracted by this magnetic force. It is configured to be pulled into the housing 242.

  In addition, a flange 246 is formed at an intermediate portion of the portion of the plunger 244 protruding from the housing 242. A compression coil spring 248 is provided between the flange 246 and the housing 242, and the plunger 244 is urged by the compression coil spring 248 in the direction of coming out of the housing 242. The proximal end portion of the wire rod 230 is locked to the distal end portion of the plunger 244.

  In a state where the plunger 244 is pulled out of the housing 242 with respect to the longitudinal direction intermediate portion by the urging force by the compression coil spring 248, the meshing portion 226 of the pawl 222 is as shown by a virtual line (two-dot chain line) in FIG. It is separated from the ratchet plate 216. In this state, when the solenoid in the housing 242 is energized and the magnetic force of the magnetic field formed around the solenoid pulls the plunger 244 into the housing 242 against the biasing force of the compression coil spring 248, the wire rod 230 is pulled. As a result, the pawl 222 rotates to one side around the shaft 224 and the tip end side of the meshing portion 226 meshes with the ratchet teeth 218 of the ratchet plate 216.

  On the other hand, as shown in FIG. 6, the webbing retractor 210 includes a driver 262. The driver 262 is electrically interposed between the solenoid unit 240 and the battery 124. Further, the driver 262 is electrically connected to the ECU 126, and a solenoid drive that is output from the ECU 126 at substantially the same timing as the motor drive control signal that is output from the ECU 126 is a motor drive control signal that drives the motor 100 to rotate forward. When the control signal is input to the driver 262, the driver 262 energizes the solenoid in the housing 242.

<Operation and Effect of Third Embodiment>
Next, the operation and effect of the webbing retractor 210 will be described through the operation of the webbing retractor 210.

  In the webbing retractor 210, the distance to the obstacle in front of the traveling vehicle is less than a certain value in a state where the webbing belt 22 pulled out from the spool 20 is attached to the occupant's body. When the forward monitoring device 128 detects and a detection signal at this time is input to the ECU 126, the driver 122 causes the motor 100 to pass a forward drive current based on the motor drive control signal output from the ECU 126.

  When the motor 100 is driven and the output shaft 102 rotates in the forward direction, the forward rotation of the output shaft 102 is transmitted to the clutch gear 214 via the gears 104 to 112 and the gear 182 to rotate the clutch gear 214 in the forward direction. As the clutch gear 214 rotates forward, the tip of the pawl 84 meshes with the connecting teeth 82 of the adapter 80 as in the first embodiment, and the forward rotation of the clutch gear 214 is performed via the sleeve 40 and the torsion shaft 32. Thus, the spool 20 is rotated in the winding direction. As a result, the “slack” described above is eliminated, and the occupant's body is firmly restrained by the webbing belt 22.

  On the other hand, as described above, when the motor drive control signal is output from the ECU 126, it is output from the solenoid drive control signal from the ECU 126 at almost the same timing as this output timing. When the solenoid drive control signal output from the ECU 126 is input to the driver 262, the driver 262 energizes the solenoid in the housing 242.

  Thus, when a magnetic field is formed around the solenoid, the plunger 244 is pulled into the housing 242 against the urging force of the compression coil spring 248 by the magnetic force. When the plunger 244 is pulled into the housing 242, the wire rod 230 connected to the tip of the plunger 244 pulls the connecting portion 228 of the pawl 222 and rotates the pawl 222 to one side around the shaft 224. When the pawl 222 rotates in this way, the front end side of the meshing portion 226 meshes with the ratchet teeth 218 of the ratchet plate 216.

  Thus, in a state where the tip end side of the meshing portion 226 meshes with the ratchet teeth 218 of the ratchet plate 216, the ratchet plate 216 can be rotated in the winding direction, but the rotation in the pull-out direction is restricted. Since the ratchet plate 216 is provided coaxially and integrally with the clutch gear 214, the rotation of the ratchet plate 216 in the pull-out direction is restricted, so that the rotation of the clutch gear 214 in the pull-out direction is also restricted. .

  Further, when the clutch gear 214 is rotated in the forward direction, the pawl 84 in the clutch gear 214 and the connecting tooth 82 of the adapter 80 mesh with each other. Therefore, the rotation of the clutch gear 214 in the pull-out direction is restricted, so that the torsion The rotation of the shaft 32 and further the spool 20 in the pull-out direction is restricted. For this reason, when the meshing portion 226 meshes with the ratchet teeth 218 of the ratchet plate 216, the spool 20 cannot rotate in the pull-out direction even if the occupant pulls the webbing belt 22 due to the inertia of the vehicle sudden deceleration. The webbing belt 22 cannot be pulled out. As a result, the occupant's body cannot move inertially toward the front side of the vehicle.

  In this state, when the occupant's body pulls the webbing belt 22, the rotational force in the pull-out direction applied to one end portion (coupling portion 36) of the torsion shaft 32 via the spool 20 is the shaft main body 34 of the torsion shaft 32. When the mechanical strength of the torsion shaft 32 is exceeded, torsional deformation occurs in the shaft main body 34 so that one end portion (coupling portion 36) of the torsion shaft 32 rotates in the pull-out direction with respect to the other end portion (coupling portion 38). The spool 20 is allowed to rotate in the pull-out direction by the amount of torsional deformation of the shaft body 34. The webbing belt 22 is pulled out from the spool 20 by the amount of rotation of the spool 20 in the pull-out direction, and the occupant's body can move to the front side of the vehicle by the length of the webbing belt 22 pulled out from the spool 20. Energy is absorbed by the torsional deformation that occurs.

  As described above, the present embodiment is different from the first embodiment in that the first embodiment is different in that the rotation of the torsion shaft 32 in the other direction is restricted after the motor 100 starts the forward rotation driving. It is the same as the form. For this reason, the webbing belt 22 is not pulled out from the spool 20 until the shaft body 34 of the torsion shaft 32 is torsionally deformed, and the restraining performance of the occupant's body by the webbing belt 22 can be maintained. The same effect as that of the embodiment can be obtained.

  Moreover, since the rotation restriction of the ratchet plate 216 is released simply by releasing the energization to the solenoid in the housing 242, the control is easy and the configuration is simple.

  In the present embodiment, the solenoid of the solenoid unit 240 is energized at the timing of starting the forward rotation of the motor 100. However, the timing of starting energization of the solenoid of the solenoid unit 240 is not necessarily positive. The timing may not be the same as the start timing of the rolling drive.

  Further, in the present embodiment, as described above, the shaft 224 of the pawl 222 is engaged with the ratchet teeth 218 of the ratchet plate 216 by the magnetic force formed by energizing the solenoid of the solenoid unit 240. However, the pawl 222 only needs to be able to engage the ratchet teeth 218 with the shaft 224 in conjunction with the motor 100. For this reason, the structure for rotating the pawl 222 in the direction in which the shaft 224 meshes with the ratchet teeth 218 may not be the solenoid unit 240, and other driving means such as a motor may be used. Alternatively, the pawl 222 may be rotated by receiving the forward driving force of the motor 100 indirectly.

  Further, in the present embodiment, the pawl 222 and the ratchet plate 216 are provided separately from the lock base 52 and the lock pawl 54. However, the lock pawl 54 is moved in a direction to engage with the lock base 52 using the solenoid unit 240. The same effect as that of the present embodiment can also be obtained as a configuration for rotation.

It is the composite figure of the front view which shows the structure of the webbing winding device concerning the 1st embodiment of the present invention, and the block diagram which shows the outline of control. It is side surface sectional drawing which shows the structure of the control means of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is side surface sectional drawing corresponding to FIG. 2 which shows the state just before the connection of a 1st rotary body and a 2nd rotary body. It is side surface sectional drawing corresponding to FIG. 2 which shows the connection state of a 1st rotary body and a 2nd rotary body. It is the composite figure of the block diagram which shows the front view which shows the structure of the webbing winding device concerning the 2nd Embodiment of this invention, and the outline | summary of control. It is the composite figure of the front view which shows the structure of the webbing winding apparatus which concerns on the 3rd Embodiment of this invention, and the block diagram which shows the outline | summary of control. It is side surface sectional drawing which shows the structure of the control means of the webbing winding apparatus which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

10 Webbing take-up device 20 Spool 22 Webbing belt 32 Torsion shaft (energy absorbing means)
62 Drive force transmission mechanism (drive means interlocking regulation mechanism, regulation means)
66 Worm wheel 80 Adapter (first rotating body)
84 Paul (connecting means)
100 motor (drive means)
116 Worm gear 126 ECU (control means)
170 Webbing take-up device 190 ECU (control means)
210 Webbing take-up device 222 Paul (regulating member)
240 Solenoid unit (regulating member driving means)

Claims (9)

A spool that winds the webbing belt from the base end side by locking the longitudinal base end portion of the long belt-shaped webbing belt and rotating around one axis in one winding direction;
The one end side is integrally connected to the spool and rotates together with the spool, and the spool is deformed by being deformed by transmitting the rotational force of the spool of a certain size or more to the one end side while the other end side is held. Energy absorbing means that allows rotation of
Driving means for driving when the vehicle suddenly decelerates or when a collision with an obstacle ahead of the vehicle is predicted;
Restriction means for restricting rotation of the other end side of the energy absorbing means in the pulling direction opposite to the winding direction when the driving means is driven;
A webbing take-up device comprising:   Driving means interlocking regulation that is actuated by receiving the driving force of the driving means and mechanically connected to the other end side of the energy absorbing means to restrict the other end side of the energy absorbing means from rotating in the pulling direction. The webbing take-up device according to claim 1, wherein the restricting means is configured including a mechanism.   The driving means interlocking regulation mechanism is mechanically connected to the other end side of the energy absorbing means with a driving force in the forward direction, and the driving means interlocking regulation mechanism and the energy absorbing means are driven with a driving force in the reverse direction. The webbing take-up device according to claim 2, wherein a motor that eliminates mechanical connection is used as the driving means.   The direction of the driving force when the driving force of the motor in the forward rotation direction is transmitted to the spool via the driving means interlocking regulation mechanism and the energy absorbing means is set to the winding direction. The webbing take-up device described. A first rotating body integrally attached to the other end of the energy absorbing means;
A second rotating body coaxially rotatable relative to the first rotating body;
A driving force transmitting means that transmits the driving force of the motor to the second rotating body and cannot transmit the rotation of the second rotating body to the motor;
Connecting means for mechanically connecting the second rotating body to the first rotating body when the driving force of the motor in the forward rotation direction is transmitted and the second rotating body rotates;
The webbing retractor according to claim 3 or 4, wherein the drive means interlocking regulation mechanism is configured including A worm gear that rotates with the driving force of the motor;
The rotator rotates when the worm gear meshes with the worm gear, and the rotation force transmitted from the worm gear is connected to the first rotator in the connected state between the first rotator and the second rotator by the connecting means. With a worm wheel that tells
The webbing take-up device according to claim 5, wherein the drive means interlocking regulation mechanism is configured including   The pull-out provided to the energy absorbing means when the occupant's body pulls the webbing belt due to inertia when the vehicle collides with the obstacle in the driving state of the driving means. The ebbing take-up device according to claim 1, wherein the driving means applies a turning force in the winding direction that is greater than a turning force in a direction. A regulating member that regulates rotation of the other end side of the energy absorbing means in the pull-out direction by being mechanically connected directly or indirectly to the other end side of the energy absorbing means;
A regulating member driving unit that starts driving at a predetermined timing according to the timing of the driving start of the driving unit, and connects the regulating member to the other end side of the energy absorbing unit;
The ebbing take-up device according to claim 1, further comprising a restricting means.   The control means which drives the said drive means when the distance to the obstruction which exists ahead of the said vehicle including the other vehicles which drive ahead of a vehicle reaches less than predetermined value is provided. The webbing take-up device according to any one of the above.

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