JP2010018179A - Webbing winding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a webbing winding apparatus capable of easily setting a load with which a webbing is paid out from a winding member by an occupant in an emergency of a vehicle. <P>SOLUTION: In the webbing winding apparatus 10, a lock plate 32 is engaged with a lock ring 34 to regulate the rotation of a spool 16 in the pay-out direction in an emergency of a vehicle. Further, by operating a pretensioner mechanism 54, the spool 16 is rotated in the winding direction, and a lock pawl 84 is engaged with a pinion 56 to regulate the rotation in the pay-out direction of an engagement part 22A of a torsion shaft 22. Here, the pretensioner mechanism 54 is operated, a wire 36 is moved by a lock stopper 64 to be rotated in the winding direction, and the rotational regulation of the lock ring 34 by the wire 36 is released. Thus, the spool 16 is rotatable integrally with the lock ring 34, and the rotational regulation in the pay-out direction of the spool 16 is released. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a webbing take-up device that regulates rotation of a take-up member in a pull-out direction in the event of an emergency of a vehicle.

  As a webbing take-up device (seat belt take-up device), there is a device in which a torsion bar constituting a force limiter mechanism is arranged in a spool around which a seat belt to be worn by a passenger is taken up. One end is connected to one end of the spool so as to be integrally rotatable.

  Further, the webbing take-up device is provided with a pretensioner, and when the vehicle is in an emergency, the pretensioner is operated and the pretensioner generates gas, and the pressure of the gas causes the spool to move in the take-up direction. A rotational force is applied.

  Further, the webbing take-up device is provided with a lock mechanism, and the rotation of the other end of the torsion bar in the pull-out direction is locked by the lock mechanism in the event of an emergency of the vehicle.

  After the pretensioner is actuated, a rotational force in the pull-out direction is applied to the spool via the seat belt as the occupant moves forward, and one end of the torsion bar (connecting portion with the spool) is connected to the other end (by the lock mechanism). Relative to the lock part) in the pull-out direction. As a result, the spool is allowed to rotate in the pull-out direction while being twisted and deformed.

  Here, the rotational force applied to the spool by the pretensioner is the winding direction, while the rotational force acting on the spool from the occupant when the force limiter mechanism is operated is the pulling direction. Moreover, when the force limiter mechanism is activated, the pretensioner is already activated.

  For this reason, when the pretensioner is provided on one end side of the spool (on the side connected to one end of the torsion bar), the rotation in the pull-out direction of the spool by the operation of the force limiter mechanism is performed after the rotational force in the winding direction is applied. The pretensioner may limit the residual pressure of the generated gas.

  As a webbing take-up device (seat belt take-up device) that solves this problem, one end of a torsion bar is connected to one end of a spool so as to be integrally rotatable, and in the event of a vehicle emergency, the pretensioner is connected to the other end of the torsion bar. There is one that imparts a rotational force in the winding direction (see, for example, Patent Document 1).

  In this webbing take-up device, a locking base is connected to one end of the spool so as to be integrally rotatable by a shear pin, and in the event of a vehicle emergency, the rotation of the locking base in the pull-out direction is locked and the spool rotates in the pull-out direction. Is locked and the rotation of the other end of the torsion bar in the pull-out direction is locked. Furthermore, a rotational force in a pulling direction more than a predetermined value is applied to the spool via the seat belt from the occupant, so that the shear pin is broken and the connection between the spool and the locking base is released. The rotation lock in the direction is released. In this state, since the lock at the other end of the torsion bar is maintained, the spool is rotated in the pulling direction while the torsion bar is twisted and deformed by the rotational force in the pulling direction, and the seat belt is pulled out from the spool.

However, in this webbing retractor, the shear pin is broken by the rotational force in the pull-out direction applied to the spool from the occupant via the seat belt. For this reason, it may be necessary to set a load for the seat belt to be pulled out from the spool in consideration of a load for breaking the shear pin.
JP 2006-298247 A

  An object of the present invention is to obtain a webbing take-up device that can easily set a load for the webbing to be pulled out from the take-up member by an occupant in the event of an emergency of the vehicle in consideration of the above facts.

  The webbing take-up device according to claim 1 is a webbing to be mounted on a vehicle occupant, and the webbing is taken up by being rotated in the take-up direction, and is rotated in the draw-out direction by being pulled out. A winding member to be wound and a radially inner side of the winding member, one of the axial directions being connected to the winding member, and being twisted and deformed by relative displacement with the other side in the axial direction, and the movement of the occupant A torsion shaft capable of absorbing energy, a restricting means for restricting rotation of the winding member in the pull-out direction in the event of a vehicle emergency, and the winding member rotating in the winding direction when operated in an emergency of the vehicle A force applying means, and a rotation restricting means different from the restricting means when the applying means is operated to restrict the rotation of the torsion shaft in the pull-out direction, and the restricting means And canceling means for canceling the restriction of rotation of the pull-out direction of the Kimakito member, and a.

  The webbing take-up device according to claim 2 is the webbing take-up device according to claim 1, wherein the restricting means includes a lock ring having teeth on the entire circumference, and the lock ring is rotated by the releasing means. enable.

  In the webbing take-up device according to the first aspect, the torsion shaft is disposed radially inward of the take-up member, and one of the torsion shafts in the axial direction is connected to the take-up member.

  Further, in an emergency of the vehicle, the regulating means regulates the rotation of the winding member in the pulling direction. For this reason, pulling out the webbing from the winding member is restricted, and the webbing restrains the occupant.

  Further, when the vehicle is in an emergency, the applying means is operated to apply the rotational force in the winding direction to the winding member. For this reason, the winding force to a winding member is provided to webbing, and the restraining force of the passenger | crew by webbing increases.

  Here, when the applying means is operated, the rotation restricting means different from the restricting means is used to restrict the rotation of the torsion shaft in the pull-out direction, and the restriction of the rotation of the winding member in the pull-out direction by the restricting means is released. Means release. As a result, the torsion shaft is torsionally deformed by the relative displacement with the other axial side of the axial direction due to the rotational force in the pulling direction acting on the winding member from the occupant via the webbing, and the kinetic energy of the occupant is reduced. Absorbed.

  In the webbing take-up device according to the second aspect, the restricting means includes a lock ring having teeth on the entire circumference.

  Here, the lock ring can be rotated by the releasing means. For this reason, it is not necessary for the release means to release the engagement with the lock ring by the restriction means, and the configuration of the release means can be simplified.

[First Embodiment]
FIG. 1 is a cross-sectional view of a webbing retractor 10 according to a first embodiment of the present invention as viewed from the inner side in the vehicle width direction. Further, FIG. 2 shows a side view of the webbing take-up device 10 viewed from one side in the vehicle front-rear direction, and FIG. 3 shows a side view of the webbing take-up device 10 viewed from the other side in the vehicle front-rear direction. It is shown in the figure. In the drawings, the inner side in the vehicle width direction is indicated by an arrow IN, one side in the vehicle longitudinal direction is indicated by an arrow LO, and the upper side is indicated by an arrow UP.

  The webbing take-up device 10 according to the present embodiment is provided with a frame 12 having a U-shaped cross section. The frame 12 includes a back plate 12A on the inner side in the vehicle width direction and a leg plate on one side in the vehicle front-rear direction. 12B and a leg plate 12C on the other side in the vehicle front-rear direction are provided. The frame 12 is fixed to the vehicle at the back plate 12A, whereby the webbing take-up device 10 is installed in the vehicle.

  As shown in FIG. 1, a substantially cylindrical spool 16 as a winding member is rotatably disposed between the leg plate 12B and the leg plate 12C of the frame 12. A long belt-like webbing 18 (belt) is wound around the spool 16 from the base end side, and the webbing 18 extends upward from the frame 12 and is seated on a vehicle seat (not shown). It is attached to. Further, when the spool 16 is rotated in the winding direction (the direction of arrow A in FIGS. 2 and 3), the webbing 18 is wound around the spool 16 and the webbing 18 is pulled out from the spool 16. Is rotated in the pull-out direction (the direction of arrow B in FIGS. 2 and 3).

  A torsion shaft 22 as an energy absorbing member constituting the force limiter mechanism 20 is inserted into the spool 16 along the central axis, and one end (the following engaging portion 22A) of the torsion shaft 22 on the leg plate 12B side is inserted. The spool 16 protrudes from one end surface of the leg plate 12B side. The vicinity of one end of the torsion shaft 22 is rotatably fitted in the spool 16 and the other end 22B of the torsion shaft 22 on the leg plate 12C side is fitted in the spool 16 so as not to rotate. Is rotatable together with the spool 16. One end of the torsion shaft 22 is provided with a substantially cylindrical engaging portion 22A. The engaging portion 22A protrudes outside the leg plate 12B of the frame 12 and has a friction coefficient on the outer peripheral surface by knurling or the like. It is high.

  As shown in FIGS. 1 and 3, a lock mechanism 26 as a restricting means is provided on the leg plate 12 </ b> C side of the spool 16.

  A housing portion 30 is formed in the other end of the spool 16 on the leg plate 12C side, and a substantially arc-shaped flat plate-like lock plate 32 serving as a lock member is housed so as to be movable (slidable). Lock teeth 32 </ b> A are formed at one end of the lock plate 32. A circular shaft-shaped guide pin 32B is provided on the surface of the lock plate 32 on the other end surface side of the spool 16, and the guide pin 32B protrudes from the lock plate 32 and protrudes from the other end surface of the spool 16. .

  A circular through hole 14 is formed through the leg plate 12 </ b> C of the frame 12, and an annular plate shaped lock ring 34 is disposed in the through hole 14. The lock ring 34 has an L-shaped cross section, and the outer peripheral side portion of the lock ring 34 is in contact with the inside of the leg plate 12 </ b> C of the frame 12, and the inner peripheral side portion of the lock ring 34 is in the through hole 14. It is mated. Ratchet teeth 34 </ b> A (inner teeth) as teeth are formed on the entire inner periphery of the lock ring 34, and the other end of the spool 16 is disposed in the lock ring 34. As will be described in detail later, the rotation of the lock ring 34 with respect to the leg plate 12C is restricted.

  A substantially circular shaft-shaped support shaft 16 </ b> A is integrally provided on the other end surface of the spool 16, and the support shaft 16 </ b> A projects from the other end surface of the spool 16 along the center axis of the spool 16.

  A substantially bottomed cylindrical V gear 38 is disposed on the other end surface of the spool 16. The V gear 38 is supported by the support shaft 16 </ b> A (spool 16) so that the support shaft 16 </ b> A (spool 16) can follow and rotate. ing. A bent guide hole 38A is formed through the V gear 38, and a guide pin 32B of the lock plate 32 is inserted into one end of the guide hole 38A.

  An acceleration sensor (not shown) is provided below the V gear 38, and when the acceleration sensor detects a sudden deceleration of the vehicle (an emergency state of the vehicle), the pulling direction of the V gear 38 is detected by the acceleration sensor. Rotation to is enabled.

  As shown in FIG. 7, in a state where the rotation of the V gear 38 in the pulling direction is restricted, when the spool 16 is slightly rotated in the pulling direction via the webbing 18 by the occupant, the pulling of the spool 16 with respect to the V gear 38 is performed. By rotating in the direction, the guide pin 32B of the lock plate 32 is moved from one end of the guide hole 38A of the V gear 38 to the other end. For this reason, the lock teeth 32A of the lock plate 32 are engaged with the ratchet teeth 34A of the lock ring 34 as the lock plate 32 is moved in the accommodating portion 30. This restricts (locks) rotation of the spool 16 in the drawing direction (rotation of the spool 16 in the winding direction is permitted).

  As shown in FIGS. 1 and 2, a rack and pinion type pretensioner mechanism 54 is provided on the outer side of the leg plate 12B of the frame 12 as an applying means.

  The pretensioner mechanism 54 is provided with a pinion 56 as an imparting member, and a gear 58 is provided on a portion of the pinion 56 opposite to the leg plate 12B. A clutch portion 60 as a restricting portion that constitutes a rotation restricting means is provided on the leg plate 12B side portion of the pinion 56, and the engaging portion 22A of the torsion shaft 22 is rotatably disposed in the clutch portion 60. ing. A predetermined number (five in the present embodiment) of recesses 60 </ b> A are formed on the inner peripheral surface of the clutch portion 60, and the predetermined number of recesses 60 </ b> A are arranged at equal intervals in the circumferential direction of the clutch portion 60. At the same time, the depth is gradually reduced as it goes in the drawing direction. Further, ratchet teeth 60 </ b> B are formed on the entire outer periphery of the clutch portion 60.

  A substantially annular plate-shaped clutch member 62 shown in detail in FIG. 4 is disposed between the pinion 56 and the leg plate 12B, and the engagement portion 22A of the torsion shaft 22 is rotatable in the clutch member 62. Is arranged. A predetermined number (five in this embodiment) of bent-bar-shaped biting portions 62A are integrally provided on the inner periphery of the clutch member 62, and the base end side portion of the biting portion 62A It extends radially inward. The front end side portion of the biting portion 62A extends to the opposite side to the leg plate 12B and is accommodated in the winding direction side portion in the recess 60A of the pinion 56 (clutch portion 60). The outer periphery of the clutch member 62 is disposed outside the outer periphery of the clutch portion 60 (ratchet teeth 60B), and a predetermined number of semicircular mounting holes 62B are provided on the outer peripheral edge of the clutch member 62 (5 in this embodiment). Is formed through.

  On the outer periphery of the clutch member 62, a block-shaped lock stopper 64 is provided as an operating member constituting a releasing means at a portion opposite to the leg plate 12B. The surface of the lock stopper 64 on the leg plate 12B side is A predetermined number (two in this embodiment) of cylindrical mounting columns 64A is formed. The mounting column 64 </ b> A is fitted into the mounting hole 62 </ b> B of the clutch member 62, so that the lock stopper 64 is mounted on the clutch member 62 and is rotatable together with the clutch member 62.

  The side wall 12B of the frame 12 is provided with a stopper 82 as a mounting release member in the vicinity of the outer periphery of the clutch member 62. The tip end portion of the stopper 82 is located on the side of the lock stopper 64 in the winding direction. Is disposed on the opposite side of the side wall 12B.

  On the side wall 12B of the frame 12, a lock pawl 84 serving as a rotation restricting member constituting the rotation restricting means is rotatably supported at the proximal end in the vicinity of the outer periphery of the clutch member 62. The lock pawl 84 is urged by an urging means (not shown) in a direction to rotate toward the pinion 56 and is engaged with the lock stopper 64, whereby the lock pawl 84 is engaged with the clutch portion 60 of the pinion 56. Engagement (engagement) with (ratchet teeth 60B) is avoided.

  One end of a long wire 36 as a release member constituting release means is coupled to the lock stopper 64, and the wire 36 extends through the side wall 12 </ b> B of the frame 12 to the leg plate 12 </ b> C side of the frame 12. Has been issued. The other end of the wire 36 is penetrated by the lock ring 34 and the leg plate 12C to restrict the rotation of the lock ring 34 with respect to the leg plate 12C.

  A bottomed cylindrical cylinder 66 as an accommodating member is provided below the pinion 56, and the cylinder 66 is disposed along the vertical direction. The cylinder 66 is fixed to the leg plate 12 </ b> B of the frame 12, and the upper end of the cylinder 66 is opened below the pinion 56.

  A lower end (bottom) of the cylinder 66 is communicated with one end of a substantially cylindrical communication tube 68, and a gas generator 70 is fixed to the other end of the communication tube 68. The gas generator 70 closes the other end of the communication cylinder 68, and the gas generator 70 is electrically connected to a vehicle control device 88. A vehicle detection device 90 is electrically connected to the control device 88. When the detection device 90 detects an emergency state (collision) of the vehicle (when the vehicle is in an emergency), the pretensioner mechanism 54 is operated by the control of the control device 88, so that the gas generation device 70 has a high-pressure gas. Is generated instantaneously and can be supplied to the lower end of the cylinder 66 through the communication cylinder 68.

  A piston 72 as a moving member is provided in the cylinder 66, and the piston 72 is movable in the vertical direction in the cylinder 66.

  The piston 72 is provided with a rectangular columnar rack 80 at a portion other than the lower portion, and rack teeth 80A are formed on the back plate 12A side portion of the rack 80. The rack 80 protrudes from the cylinder 66, and the tip of the rack 80 is disposed near the lower side of the gear 58 of the pinion 56.

  As shown in FIGS. 5 and 6, in an emergency of the vehicle, the piston 72 receives the pressure (internal pressure) of the high-pressure gas supplied from the gas generator 70 to the lower end of the cylinder 66 from the lower side, and the piston 72 Move to the upper side (one side). Thereby, the rack 80 (rack tooth 80A) of the piston 72 is meshed with the gear 58 of the pinion 56, and the pinion 56 is rotated in the winding direction.

  Next, the operation of the present embodiment will be described.

  In the webbing take-up device 10 having the above-described configuration, the lock mechanism 26 is activated in the event of an emergency of the vehicle (when the acceleration sensor detects a sudden deceleration of the vehicle), and the acceleration sensor rotates the V gear 38 in the pull-out direction. Is regulated.

  In a state where the rotation of the V gear 38 in the pulling direction is restricted, when the spool 16 is slightly rotated in the pulling direction via the webbing 18 by the occupant, the rotation of the spool 16 with respect to the V gear 38 in the pulling direction results in The guide pin 32B of the lock plate 32 is moved from one end of the guide hole 38A of the V gear 38 to the other end. For this reason, the lock teeth 32A of the lock plate 32 are engaged with the ratchet teeth 34A of the lock ring 34 as the lock plate 32 is moved in the accommodating portion 30. As a result, the rotation of the spool 16 in the pull-out direction is restricted (the rotation of the spool 16 in the take-up direction is permitted), so that the webbing 18 is restricted from being pulled out from the spool 16 and the webbing 18 is occupant. Is restrained.

  In an emergency of the vehicle (when the detection device 90 detects a vehicle collision), the pretensioner mechanism 54 is operated by the control of the control device 88, so that the gas generator 70 instantaneously discharges the high-pressure gas. And is supplied to the lower end in the cylinder 66 through the communication cylinder 68. For this reason, the piston 72 receives the pressure of the gas from the lower side, and the piston 72 is moved upward. Thereby, the rack 80 (rack tooth 80A) of the piston 72 is meshed with the gear 58 of the pinion 56, and the pinion 56 is rotated in the winding direction.

  When the pinion 56 is rotated in the winding direction, the tip side portion of the engaging portion 62A of the clutch member 62 moves from the winding direction side portion of the recess 60A in the clutch portion 60 of the pinion 56 to the drawing direction side portion. Is done. For this reason, the front end side portion of the biting portion 62A is bitten (engaged) between the clutch portion 60 (the bottom surface of the recess 60A) and the torsion shaft 22 (the outer peripheral surface of the engaging portion 22A). The pinion 56, the clutch member 62, and the torsion shaft 22 are integrally rotatable. Thereby, the spool 16 is rotated in the winding direction integrally with the pinion 56, the clutch member 62, and the torsion shaft 22, and the webbing 18 is wound around the spool 16, whereby the restraining force of the occupant by the webbing 18 is increased. .

  When the pretensioner mechanism 54 is operated and the clutch member 62 is rotated in the winding direction, the lock stopper 64 is rotated in the winding direction integrally with the clutch member 62 so that the lock stopper 64 contacts the stopper 82. Touch. Accordingly, the mounting column 64A of the lock stopper 64 is broken by the periphery of the mounting hole 62B of the clutch member 62, and the mounting of the lock stopper 64 to the clutch member 62 is released, so that the lock stopper 64 is retracted in the winding direction. The rotation is stopped (the rotation of the clutch member 62 in the winding direction is not stopped).

  In addition, when the lock stopper 64 is rotated in the winding direction, the engagement of the lock stopper 64 with the lock pawl 84 is released, and the lock pawl 84 is released from the clutch portion 60 of the pinion 56 by the urging force of the urging means. It meshes with ratchet teeth 60B provided on the outer periphery. As a result, the lock pawl 84 locks (regulates) the rotation of the pinion 56 in the pull-out direction (allows rotation of the pinion 56 in the winding direction), so that the engagement portion 22A of the clutch member 62 and the torsion shaft 22 is engaged. Rotation in the pull-out direction is restricted.

  Further, when the lock stopper 64 is rotated in the winding direction, the wire 36 is pulled and moved by the lock stopper 64, and the other end of the wire 36 comes out of the leg plate 12 </ b> C and the lock ring 34 of the frame 12. As a result, the restriction on the rotation of the lock ring 34 relative to the leg plate 12C is released, so that the spool 16 can rotate integrally with the lock ring 34, and the restriction of the rotation of the spool 16 in the pull-out direction by the lock mechanism 26 is restricted. Canceled.

  Thereafter, when a load in the pull-out direction acts on the webbing 18 from the occupant and the force limiter mechanism 20 is operated, the engagement of the torsion shaft 22 is caused by the rotational force in the pull-out direction that acts on the spool 16 from the webbing 18. The torsion shaft 22 is twisted and deformed between the engaging portion 22A and the other end 22B by relative rotation (relative displacement) in the pull-out direction on the other end 22B side with respect to the joining portion 22A (one end). As a result, the spool 16 is rotated in the pull-out direction, and the webbing 18 is pulled out from the spool 16 (the occupant's kinetic energy is absorbed).

  In an emergency of the vehicle, after the rotation of the spool 16 in the pull-out direction is restricted by the lock mechanism 26, the rotational force in the winding direction applied to the spool 16 by the activated pretensioner mechanism 54 causes the webbing 18 to be pulled from the occupant. In some cases, the rotational force in the pull-out direction acting on the spool 16 via the spool 16 may not be exceeded.

  Even in this case, when the pretensioner mechanism 54 is operated, the lock pawl 84 locks the rotation of the pinion 56 in the pull-out direction, and the rotation of the engaging portion 22A of the torsion shaft 22 in the pull-out direction is restricted. . In addition, before the rotational force in the winding direction is transmitted from the pinion 56 to the engaging portion 22A of the torsion shaft 22 (the pinion 56 and the engaging portion 22A of the torsion shaft 22 are integrally rotatable by the clutch member 62. Previously, the movement of the wire 36 due to the rotation of the clutch member 62 and the lock stopper 64 in the winding direction releases the restriction of the rotation of the spool 16 in the pull-out direction by the lock mechanism 26.

  Thereby, the spool 16 is rotated in the pulling direction while the torsion shaft 22 is torsionally deformed between the engaging portion 22A and the other end 22B by the rotational force in the pulling direction acting on the spool 16 from the occupant via the webbing 18. The webbing 18 can be pulled out of the spool 16 (the force limiter mechanism 20 can be activated).

  Further, when the pretensioner mechanism 54 is operated, the lock pawl 84 locks the rotation of the pinion 56 in the pull-out direction, so that the force limiter mechanism 20 is operated and the spool 16 is rotated in the pull-out direction. Even in this case, the rotation of the pinion 56 in the pull-out direction integrally with the spool 16 is restricted. Accordingly, the piston 72 is restricted from moving downward (other side) by the rotation of the pinion 56 in which the rack 80 (rack teeth 80A) of the piston 72 is engaged with the gear 58 in the pulling-out direction. Therefore, it is possible to prevent the pressure of the gas remaining in the cylinder 66 below the piston 72 from affecting the withdrawal of the webbing 18 from the spool 16, and the withdrawal of the webbing 18 from the spool 16 is restricted by the pressure of the gas. Can be prevented.

  Further, the movement of the wire 36 due to the operation of the pretensioner mechanism 54 permits the rotation of the lock ring 34 and the restriction of the rotation of the spool 16 in the pull-out direction by the lock mechanism 26 is released.

  For this reason, it is not necessary to release the restriction of the rotation of the spool 16 in the pull-out direction by the lock mechanism 26 due to the load in the pull-out direction acting on the spool 16 from the occupant via the webbing 18. For this reason, the load (force limiter load) for the webbing 18 to be pulled out from the spool 16 by the occupant when the force limiter mechanism 20 is operated is set in consideration of the load for releasing the restriction on the rotation of the spool 16 in the pull-out direction. Can eliminate the need to do. Thereby, the setting of the load for the webbing 18 to be pulled out from the spool 16 by the occupant can be facilitated.

  Moreover, it is possible to prevent the amount of torsional deformation in the pull-out direction of the torsion shaft 22 during the operation of the force limiter mechanism 20 from decreasing.

  Further, when the pretensioner mechanism 54 is actuated, the lock ring 34 is made rotatable so that the restriction of the rotation of the spool 16 in the pull-out direction by the lock mechanism 26 is released. For this reason, it is possible to eliminate the need to release the engagement between the lock teeth 32A of the lock plate 32 and the ratchet teeth 34A of the lock ring 34, and to simplify the configuration for releasing the restriction of the rotation of the spool 16 in the pull-out direction. it can.

[Second Embodiment]
FIG. 8 shows a webbing retractor 100 according to the second embodiment of the present invention in a cross-sectional view as seen from the inside in the vehicle width direction.

  The webbing take-up device 100 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  In the webbing take-up device 100 according to the present embodiment, a fitting portion 22C is provided at one end of the torsion shaft 22 in place of the engaging portion 22A in the first embodiment.

  A substantially cylindrical lock gear 40 is attached to one end of the spool 16 as a restricting portion that constitutes a rotation restricting means.

  A substantially cylindrical sleeve portion 42 is provided on the spool 16 side portion of the lock gear 40, and the sleeve portion 42 is rotatably mounted in one end of the spool 16. A fitting portion 22 </ b> C of the torsion shaft 22 is fitted in the sleeve portion 42 so as to be integrally rotatable, and the lock gear 40 is rotatable integrally with the torsion shaft 22.

  A gear portion 44 is provided on the opposite side of the lock gear 40 from the spool 16, and the gear portion 44 protrudes from one end surface of the spool 16 and protrudes outside the leg plate 12 </ b> B of the frame 12. A cylindrical clutch recess 44A is formed on the surface of the lock gear 40 opposite to the spool 16, and the outer peripheral surface of the clutch recess 44A has a high friction coefficient. Further, ratchet teeth 44 </ b> B are formed on the entire outer periphery of the gear portion 44.

  The clutch portion 60 of the pinion 56 has a columnar shape, and the clutch portion 60 is rotatably accommodated in the clutch recess 44A of the lock gear 40 (gear portion 44). As shown in detail in FIG. 9, a predetermined number (five in the present embodiment) of convex portions 60 </ b> C are formed on the outer peripheral surface of the clutch portion 60, and the predetermined number of convex portions 60 </ b> C are formed on the clutch portion 60. They are arranged at equal intervals in the circumferential direction, and the protruding heights are gradually increased in the drawing direction.

  The front end side portion of the biting portion 62A of the clutch member 62 extends to the leg plate 12B side, and the clutch portion 60 of the pinion 56 is located inside the clutch member 62 (inside the predetermined number of biting portion 62A front end side portions). The front end side portion of the biting portion 62 </ b> A is disposed (pressed contact) on the winding direction side portion of the convex portion 60 </ b> C of the clutch portion 60. The outer peripheral portion of the clutch member 62 is disposed on the side opposite to the side wall 12B of the lock gear 40 (gear portion 44), and the front end side portion of the engaging portion 62A of the clutch member 62 is coupled to the lock gear 40 ( The gear portion 44) is rotatably accommodated in a clutch recess 44A.

  The lock stopper 64 is integrally provided with an extension portion 64B. The extension portion 64B extends from the lock stopper 64 toward the side wall 12B and is disposed on the outer periphery of the gear portion 44 of the lock gear 40. A lock pawl 84 is engaged with the extending portion 64B of the lock stopper 64 by the urging force of the urging means, whereby the lock pawl 84 is engaged (engaged) with the gear portion 44 (ratchet teeth 44B) of the lock gear 40. Is avoided.

  Here, when the pretensioner mechanism 54 is actuated and the pinion 56 is rotated in the winding direction by the piston 72 in an emergency of the vehicle, the front end side portion of the engaging portion 62A of the clutch member 62 is moved to the pinion 56. Of the convex portion 60C of the clutch portion 60 is moved from the winding direction side portion to the drawing direction side portion. For this reason, the front end side portion of the biting portion 62A is bitten (engaged) between the clutch portion 60 (the peripheral surface of the convex portion 60C) and the lock gear 40 (the outer peripheral surface of the clutch concave portion 44A). The pinion 56, the clutch member 62, the lock gear 40, and the torsion shaft 22 are integrally rotatable. As a result, the spool 16 is rotated in the winding direction integrally with the pinion 56, the clutch member 62, the lock gear 40, and the torsion shaft 22, and the webbing 18 is wound around the spool 16, whereby the restraining force of the occupant by the webbing 18 is increased. Will be increased.

  When the pretensioner mechanism 54 is operated and the clutch member 62 is rotated in the winding direction, the lock stopper 64 is rotated in the winding direction integrally with the clutch member 62 so that the lock stopper 64 contacts the stopper 82. Touch. Thereby, the mounting column 64A of the lock stopper 64 is broken by the peripheral edge of the mounting hole 62B of the clutch member 62, and the mounting of the lock stopper 64 to the clutch member 62 is released, so that the lock stopper 64 in the winding direction is released. The rotation is stopped (the rotation of the clutch member 62 in the winding direction is not stopped). Moreover, when the lock stopper 64 is rotated in the winding direction, the lock stopper 64 (extension portion 64B) is disengaged from the lock pawl 84, and the lock pawl 84 is locked by the urging force of the urging means. 40 is engaged with ratchet teeth 44B provided on the outer periphery of the gear portion 44. Accordingly, the lock pawl 84 locks (regulates) the rotation of the lock gear 40 in the pull-out direction (allows the lock gear 40 to rotate in the winding direction), so that the pinion 56, the clutch member 62, and the torsion shaft 22 are fitted. The rotation of the joining portion 22C in the drawing direction is restricted.

  As described above, also in this embodiment, the same operations and effects as those of the first embodiment can be obtained.

  In the first embodiment and the second embodiment, the clutch member 62 is interposed between one end of the torsion shaft 22 and the pinion 56, so that one end of the torsion shaft 22 and the pinion are normally used in a vehicle. However, it is also possible to employ a configuration in which one end of the torsion shaft 22 and the pinion 56 are always coupled so as to be integrally rotatable. In this case, the lock stopper 64 is attached to the pinion 56 so as to be integrally rotatable, and when the pretensioner mechanism 54 is operated, the pinion 56 is rotated in the winding direction so that the lock stopper 64 comes into contact with the stopper 82, thereby It is good also as a structure by which mounting | wearing of the lock stopper 64 is cancelled | released.

It is sectional drawing seen from the vehicle width direction inner side which shows the webbing winding device concerning a 1st embodiment of the present invention. 1 is a side view of a webbing take-up device according to a first embodiment of the present invention viewed from one side in a vehicle front-rear direction. It is the side view seen from the vehicle front-back direction other side which shows the webbing winding device concerning a 1st embodiment of the present invention. FIG. 3 is an exploded perspective view showing the clutch member, the lock stopper, and the lock pawl in the webbing take-up device according to the first embodiment of the present invention as viewed from one side in the vehicle front-rear direction and the inner side in the vehicle width direction. It is sectional drawing seen from the vehicle width direction inner side which shows the emergency of the vehicle in the webbing winding device which concerns on the 1st Embodiment of this invention. It is the side view seen from the vehicle front-back direction 1 side which shows the emergency of the vehicle in the webbing winding device concerning a 1st embodiment of the present invention. It is the side view seen from the vehicle front-back direction other side which shows the emergency of the vehicle in the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the vehicle width direction inner side which shows the webbing winding device concerning a 2nd embodiment of the present invention. FIG. 6 is an exploded perspective view showing a clutch member, a lock stopper, a lock pawl, and a lock gear in a webbing take-up device according to a second embodiment of the present invention as seen from one side in the vehicle front-rear direction and the inner side in the vehicle width direction.

Explanation of symbols

10 Webbing take-up device 16 Spool (winding member)
18 Webbing 22 Torsion shaft (Rotating member)
26 Locking mechanism (regulating means)
34 Lock ring 34A Ratchet teeth (tooth)
36 wire (release means)
40 Lock gear (rotation restricting means)
54 Pretensioner mechanism (applying means)
60 Clutch part (rotation restricting means)
64 Lock stopper (Release means)
84 Lock pawl (rotation restricting means)
100 Webbing take-up device

Claims (2)

A webbing to be worn by a vehicle occupant;
The webbing is wound by being rotated in the winding direction, and the winding member is rotated in the pulling direction by being pulled out,
A torsion shaft that is arranged on the radially inner side of the winding member, one of which is connected to the winding member, is torsionally deformed by relative displacement with the other side in the axial direction, and can absorb the kinetic energy of the occupant When,
Restriction means for restricting rotation of the winding member in the pull-out direction in the event of an emergency of the vehicle;
An applying means for applying a rotational force in the winding direction to the winding member by being actuated in an emergency of the vehicle;
When the applying means is operated, the rotation restricting means different from the restricting means restricts the rotation of the torsion shaft in the pulling direction, and the restricting means restricts the rotation of the winding member in the pulling direction. Releasing means for releasing
A webbing take-up device comprising:   The webbing take-up device according to claim 1, wherein the restricting means includes a lock ring having teeth on the entire circumference, and the lock ring can be rotated by the releasing means.

Images