JP2015227077A - Webbing winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in a speed of winding webbing on a spool even when a time when a winding member is rotated in a winding direction is lengthened by energizing force that energizing means applies.SOLUTION: In a webbing winding device 10, a spool 14 is rotated in a winding direction by energizing force of a power spring 36, and webbing is wound on the spool 14. When the spool 14 is rotated in the winding direction, resistance force of a rotary damper 30 is applied to the rotation in the winding direction of the spool 14. Thereby, even when a time when the spool 14 is rotated in the winding direction is lengthened, an increase in a speed of winding the webbing on the spool 14 can be suppressed.

Description

  The present invention relates to a webbing take-up device in which a webbing is taken up by a take-up member by rotating the take-up member in a take-up direction.

  In the seatbelt retractor described in Patent Document 1 below, the spring-type winding device applies a biasing force in the winding direction to the spindle, whereby the spindle is rotated in the winding direction, and the webbing is wound around the spindle. Taken.

  Here, in the seat belt retractor, as the time for rotating the spindle in the winding direction is increased by the urging force applied by the winding device, the rotation speed of the spindle in the winding direction increases, and the webbing spindle Winding speed is increased.

JP 2014-24478 A

  In consideration of the above fact, the present invention can suppress an increase in the winding speed of the webbing to the winding member even when the time for rotating the winding member in the winding direction by the biasing force applied by the biasing means becomes long. The object is to obtain a webbing take-up device.

  The webbing take-up device according to claim 1 is a webbing that can be mounted on a vehicle occupant, and the webbing is taken up by being rotated in the take-up direction, and the webbing is drawn out by being drawn out. A winding member that is rotated in the direction, a biasing unit that applies a biasing force in the winding direction to the winding member, and a resistance unit that applies a resistance force to the winding of the webbing onto the winding member; It is equipped with.

  The webbing take-up device according to claim 2 is a webbing take-up device according to claim 1, in which the resistance force exerted by the resistance means increases as the winding speed of the webbing to the take-up member increases. To do.

  The webbing take-up device according to claim 3 is the webbing take-up device according to claim 1 or 2, wherein the resistance means exerts a resistance force on the winding of the webbing onto the take-up member. And switching means for switching between when the resistance means does not act on the winding of the webbing onto the winding member.

  The webbing take-up device according to claim 4 is the webbing take-up device according to any one of claims 1 to 3, wherein when the webbing is pulled out from the take-up member, the resistance means Release means for releasing communication with the webbing is provided.

  In the webbing take-up device according to the first aspect, the webbing is drawn out from the take-up member, whereby the take-up member is rotated in the pull-out direction and the webbing can be attached to the vehicle occupant. Further, the biasing means applies a biasing force in the winding direction to the winding member, and the webbing is wound around the winding member by rotating the winding member in the winding direction.

  Here, the resistance means exerts a resistance force on winding the webbing around the winding member. For this reason, even if it takes a long time to rotate the winding member in the winding direction by the biasing force applied by the biasing means, an increase in the winding speed of the webbing to the winding member can be suppressed.

  In the webbing take-up device according to the second aspect, as the take-up speed of the webbing to the take-up member increases, the resistance force applied by the resistance means is increased. For this reason, even if the time for rotating the winding member in the winding direction is increased by the biasing force applied by the biasing means, an increase in the winding speed of the webbing to the winding member can be effectively suppressed.

  In the webbing take-up device according to claim 3, when the resistance means exerts a resistance force on the winding of the webbing on the winding member, the resistance means provides a resistance force on the winding of the webbing on the winding member. The switching means switches between when not acting. For this reason, the resistance means can apply a resistance force to the winding of the webbing on the winding member as necessary.

  In the webbing take-up device described in claim 4, when the webbing is pulled out from the take-up member, the release means releases the contact of the resistance means to the webbing. For this reason, when a webbing is pulled out from a winding member, it can suppress that a resistance means acts a resistance force on webbing.

It is a front view which shows the webbing winding device concerning a 1st embodiment of the present invention. It is sectional drawing seen from the front side which shows the principal part of the webbing winding device concerning a 1st embodiment of the present invention. FIG. 3 is a cross-sectional view (sectional view taken along line 3-3 in FIG. 2) viewed from one side showing a main part of the webbing take-up device according to the first embodiment of the present invention. Relationship between winding time (horizontal axis t) due to the biasing force of the mainspring spring to the spool of the webbing in the webbing winding device according to the first embodiment of the present invention and the winding speed (vertical axis v) of the webbing to the spool It is a graph which shows. It is sectional drawing seen from the front side which shows the principal part of the webbing winding device concerning a 2nd embodiment of the present invention. It is the side view seen from one side which shows the principal part of the webbing winding device concerning a 2nd embodiment of the present invention. Relationship between winding time (horizontal axis t) due to urging force of mainspring spring to webbing spool and webbing spool winding speed (vertical axis v) in the webbing winding device according to the second embodiment of the present invention It is a graph which shows.

  [First Embodiment]

  FIG. 1 is a front view of a webbing take-up device 10 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the main part of the webbing take-up device 10 as seen from the front side. Is shown. Further, FIG. 3 shows a cross-sectional view (cross-sectional view taken along line 3-3 in FIG. 2) of the webbing take-up device 10 viewed from one side. In the drawings, the outside in the vehicle width direction is indicated by an arrow OUT, one side in the vehicle longitudinal direction is indicated by an arrow FR, and the upper side of the vehicle is indicated by an arrow UP.

  As shown in FIGS. 1 to 3, the webbing take-up device 10 according to the present embodiment is provided with a metal-made U-shaped frame 12 having a U-shaped cross section as an installation member. A back plate 12A, a leg plate 12B on one side, and a leg plate 12C on the other side are provided. The webbing take-up device 10 is fixed to a back plate 12A of the frame 12 in a rectangular cylindrical pillar (not shown) as a skeleton member of the vehicle, whereby the webbing take-up device 10 is installed in the vehicle. Thus, the front side, one side, and the upper side of the webbing take-up device 10 are directed to the vehicle width direction outer side, the vehicle front-rear direction one side (the vehicle front side or the vehicle rear side), and the vehicle upper side, respectively.

  A substantially cylindrical spool 14 made of metal as a winding member is rotatably supported between the leg plate 12B and the leg plate 12C of the frame 12, and a substantially cylindrical central shaft 14A is supported on the spool 14. Is provided. The central shaft 14A is coaxially fixed to the leg plate 12B side of the spool 14 so as to be rotatable integrally with the spool 14. The central shaft 14A passes through the leg plate 12B and extends outside the leg plate 12B of the frame 12. Has been issued.

  A long belt-like webbing 16 (belt) is wound on the spool 14 from the base end side, and the spool 14 is rotated in the winding direction (the direction of arrow A in FIG. 3), so that the webbing 16 is As the webbing 16 is pulled out from the spool 14 while being wound around the spool 14, the spool 14 is rotated in the pull-out direction (the direction of arrow B in FIG. 3).

  The webbing 16 extends upward from the frame 12, then extends from the pillar into the vehicle compartment, and the tip is fixed to the vehicle body in the vehicle width direction outside of the vehicle seat (not shown). The webbing 16 is movably inserted into a metal tongue (not shown) as a mounting member in the vehicle interior, and the tongue is locked to the front end side of the webbing 16 at a predetermined position of the webbing 16. The A buckle (not shown) as a mounting mechanism is fixed to the vehicle body on the inner side in the vehicle width direction of the seat, and the webbing 16 is pulled out from the spool 14 and the tongue is attached to the buckle so that the seat is seated on the seat. The webbing 16 is attached to the occupant.

  A lock mechanism 18 as a lock means (regulation means) is fixed to the outside of the leg plate 12C of the frame 12, and the lock mechanism 18 can communicate with the spool 14. The lock mechanism 18 is provided with an inertial body (not shown) as an actuating member, and the inertial body can be moved by an inertial force. In an emergency of the vehicle (when the vehicle is suddenly decelerated and when the webbing 16 is suddenly pulled out of the spool 14), the lock mechanism 18 is activated by moving the inertial body by the inertial force. Lock (regulate) rotation in the pull-out direction.

  A resistance mechanism 20 is provided outside the leg plate 12B of the frame 12, and the resistance mechanism 20 is provided with a box-shaped housing 20A as a support member. The housing 20 </ b> A is fixed to the leg plate 12 </ b> B of the frame 12, whereby the resistance mechanism 20 is fixed to the frame 12. A communication gear 22 as communication means is disposed in the housing 20A, and the central shaft 14A of the spool 14 is passed through the housing 20A. The communication gear 22 is coaxially penetrated by the central shaft 14A. And supported by the central shaft 14A.

  A clutch mechanism 24 (one-way clutch) as release means is provided between the communication gear 22 and the central shaft 14A. A predetermined number (four in the present embodiment) of clutch grooves 26 are formed in the central shaft 14A side portion of the communication gear 22, and the predetermined number of clutch grooves 26 are equally spaced in the circumferential direction of the communication gear 22. Has been placed. The clutch groove 26 is opened to the center shaft 14A side, and the outer peripheral surface of the clutch groove 26 (the surface opposite to the center shaft 14A) is directed inward in the radial direction of the connecting gear 22 as it goes in the winding direction. It is gradually inclined to. A cylindrical clutch body 28 is disposed in the clutch groove 26, and the clutch body 28 can generate a frictional force between the outer peripheral surface of the center shaft 14 </ b> A and the outer peripheral surface of the clutch groove 26. .

  For this reason, when the central shaft 14A is rotated in the winding direction, the clutch body 28 is moved in the winding direction by the central shaft 14A, and the outer peripheral surface of the central shaft 14A and the outer peripheral surface of the clutch groove 26 are moved. The clutch body 28 connects the center shaft 14A and the connection gear 22 by being sandwiched (engaged) between them, and the connection gear 22 is rotated integrally with the center shaft 14A in the winding direction. On the other hand, when the central shaft 14A is rotated in the pull-out direction, the clutch body 28 is moved in the pull-out direction by the central shaft 14A and is sandwiched between the outer peripheral surface of the central shaft 14A and the outer peripheral surface of the clutch groove 26. By not being performed, the clutch body 28 does not connect the center shaft 14A and the connection gear 22, and the connection gear 22 is not rotated integrally with the center shaft 14A.

  The resistance mechanism 20 is provided with a rotary damper 30 as resistance means below the communication gear 22. A damper shaft 30A is provided at the central portion of the rotary damper 30. The damper shaft 30A is fixed in the housing 20A so as not to rotate in a state in which the axial direction is parallel to the connecting gear 22. A damper gear 30B is provided coaxially with the damper shaft 30A on the outer peripheral portion of the rotary damper 30. The damper gear 30B is meshed with the connecting gear 22, and is rotatable with respect to the damper shaft 30A by the rotation of the connecting gear 22. Has been. The rotary damper 30 is configured to be able to act on the rotation of the damper gear 30B when the damper gear 30B is rotated with respect to the damper shaft 30A. The resistance force that the rotary damper 30 acts on the rotation of the damper gear 30B is: It is increased in proportion to the rotational speed of the damper gear 30B.

  An urging mechanism 32 is provided on the side of the resistance mechanism 20 opposite to the frame 12, and the urging mechanism 32 is provided with a box-shaped case 32 </ b> A as an accommodating member. The case 32 </ b> A is fixed to the resistance mechanism 20, whereby the biasing mechanism 32 is fixed to the frame 12 via the resistance mechanism 20. An adapter 34 as a connecting member is rotatably supported in the case 32A, and the adapter 34 is exposed to the resistance mechanism 20 side of the case 32A. A center shaft 14A of the spool 14 is coaxially attached to the adapter 34, and the adapter 34 can rotate integrally with the center shaft 14A.

  A mainspring spring 36 as an urging means is accommodated in the case 32A. The inner peripheral end of the mainspring spring 36 is fixed to the adapter 34, and the outer peripheral end of the mainspring spring 36 is fixed to the inner peripheral portion of the case 32 A. The mainspring spring 36 is interposed via the adapter 34. The spool 14 (center shaft 14A) is urged in the winding direction.

  Next, the operation of this embodiment will be described.

  In the webbing take-up device 10 configured as described above, the webbing 16 is pulled out from the spool 14 and the tongue of the webbing 16 is attached to the buckle, so that the webbing 16 is attached to the occupant seated on the vehicle seat. Further, when the webbing 16 is pulled out from the spool 14, the spool 14 is rotated in the pulling direction against the biasing force of the mainspring spring 36 of the biasing mechanism 32.

  In an emergency of the vehicle, the inertial body of the lock mechanism 18 is moved by the inertial force, so that the lock mechanism 18 is activated to lock the rotation of the spool 14 in the pull-out direction. As a result, the occupant is restrained by the webbing 16.

  Moreover, the mounting | wearing of the webbing 16 to a passenger | crew is cancelled | released by releasing mounting | wearing with the buckle of a tongue. As a result, the spool 14 is rotated in the winding direction by the urging force of the mainspring spring 36, and the webbing 16 is wound around the spool 14.

  Here, as described above, when the spool 14 is rotated in the winding direction by the urging force of the mainspring spring 36, the center shaft 14A of the spool 14 is rotated in the winding direction, so that the clutch of the resistance mechanism 20 is rotated. In the mechanism 24, the clutch body 28 is moved in the winding direction by the central shaft 14 </ b> A and is sandwiched between the outer peripheral surface of the central shaft 14 </ b> A and the outer peripheral surface of the clutch groove 26 of the communication gear 22. For this reason, the clutch body 28 connects the center shaft 14A and the connection gear 22 and the connection gear 22 is rotated integrally with the spool 14 in the winding direction. 22, the damper gear 30B is rotated with respect to the damper shaft 30A, and a resistance force acts on the rotation of the damper gear 30B. Thus, the resistance force of the rotary damper 30 acts on the rotation of the spool 14 (center shaft 14A) in the winding direction (winding of the webbing 16 on the spool 14) via the connection gear 22 and the clutch body 28.

  For this reason, as shown in FIG. 4, unlike the case where the rotary damper 30 is not present (see the broken line in FIG. 4), the time for which the spool 14 is rotated in the winding direction is increased by the biasing force applied by the mainspring spring 36. Also, an increase in the rotational speed of the spool 14 in the winding direction can be suppressed, and an increase in the winding speed of the webbing 16 onto the spool 14 can be suppressed (see the solid line in FIG. 4).

  As a result, even when the webbing 16 is fully wound (maximum limit) on the spool 14 and the rotation of the spool 14 in the winding direction is suddenly stopped, the deceleration of the spool 14 can be reduced. The impact applied to the inertial body of the lock mechanism 18 can be reduced, and the inertial body is moved by the impact applied from the spool 14 to activate the lock mechanism 18 to lock the rotation of the spool 14 in the pull-out direction. (So-called end lock) can be suppressed.

  In addition, when the webbing 16 is wound around the spool 14, even if the tongue locked at a predetermined position of the webbing 16 is moved together with the webbing 16, the winding speed of the webbing 16 onto the spool 14 is increased as described above. By being able to suppress, an increase in tongue moving speed can be suppressed. For this reason, the impact which a tongue collides with the interior material (for example, interior trim which coat | covers a pillar) of a vehicle interior can be reduced, and it can suppress that the interior material of a vehicle interior is damaged by a tongue.

  Further, since the resistance force that the rotary damper 30 acts on the rotation of the damper gear 30B is increased in proportion to the rotation speed of the damper gear 30B, the resistance force that the rotary damper 30 acts on the rotation of the spool 14 in the winding direction. Is increased in proportion to the rotational speed of the spool 14 in the winding direction. For this reason, even if the time for which the spool 14 is rotated in the winding direction is increased by the biasing force applied by the mainspring spring 36, an increase in the rotational speed of the spool 14 in the winding direction can be effectively suppressed, and webbing can be performed. An increase in the winding speed of the 16 spools 14 can be effectively suppressed. Thereby, especially the winding speed of the webbing 16 onto the spool 14 can be made substantially constant (see the solid line in FIG. 4), so that the high-quality feeling of the webbing take-up device 10 can be improved.

  Further, as described above, the resistance force that the rotary damper 30 acts on the rotation of the spool 14 in the winding direction is increased in proportion to the rotational speed of the spool 14 in the winding direction. For this reason, even if the mainspring spring 36 is deteriorated, for example, even if the biasing force in the winding direction that the mainspring spring 36 acts on the spool 14 decreases, the mainspring spring 36 moves in the winding direction of the spool 14 due to the biasing force of the mainspring spring 36. As the rotational speed decreases, the resistance force that the rotary damper 30 acts on the rotation of the spool 14 in the winding direction is also reduced, so that the spool 14 can rotate in the winding direction and the webbing 16 can be wound up. it can.

  Further, when the webbing 16 is pulled out from the spool 14, the center shaft 14A of the spool 14 is rotated in the pulling direction, whereby the clutch body 28 is moved in the pulling direction by the central shaft 14A in the clutch mechanism 24. Thus, it is not sandwiched between the outer peripheral surface of the central shaft 14 </ b> A and the outer peripheral surface of the clutch groove 26 of the communication gear 22. For this reason, the clutch body 28 does not connect the center shaft 14A and the connection gear 22, and the connection gear 22 is not rotated integrally with the spool 14 (the center shaft 14A) in the pull-out direction. The resistance force of the rotary damper 30 is not applied to the rotation (the webbing 16 is pulled out from the spool 14). As a result, it is possible to suppress the withdrawal of the webbing 16 from the spool 14 from being limited by the resistance force of the rotary damper 30.

  [Second Embodiment]

  FIG. 5 shows a cross-sectional view of the main part of the webbing take-up device 50 according to the second embodiment of the present invention as seen from the front side, and FIG. 6 shows the main part of the webbing take-up device 50. Is shown in a side view from one side.

  The webbing take-up device 50 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 5 and 6, in the webbing take-up device 50 according to the present embodiment, a switching mechanism 52 as a switching means is provided in the housing 20 </ b> A of the resistance mechanism 20 on the biasing mechanism 32 side of the communication gear 22. It has been.

  The adapter 34 of the urging mechanism 32 is inserted into the housing 20A, and a first gear 54 constituting a speed reduction mechanism is provided coaxially and integrally with a portion of the adapter 34 in the housing 20A. The first gear 54 meshes with a second gear 56 that constitutes a speed reduction mechanism, and the second gear 56 is rotatably supported in the housing 20A in a state in which the first gear 54 and the axial direction are parallel to each other. In addition, the diameter is larger than that of the first gear 54. The second gear 56 is integrally provided with a third gear 58 that constitutes a speed reduction mechanism coaxially, and the third gear 58 has a smaller diameter than the second gear 56.

  A substantially annular plate-shaped cam 60 serving as a switching member is rotatably supported in the housing 20A. The cam 60 is disposed coaxially with the first gear 54 and has an inner diameter equal to that of the spool 14. It is almost the same. Internal teeth 60A are formed on the entire inner peripheral surface of the cam 60, and the third gear 58 is meshed with the cam 60 at the internal teeth 60A. Therefore, when the spool 14 (the central shaft 14A and the adapter 34) is rotated, the cam 60 is decelerated and rotated via the first gear 54, the second gear 56, and the third gear 58.

  A curved plate-like protrusion 60B is integrally provided on a part of the cam 60 in the circumferential direction, and the protrusion 60B protrudes radially outward of the cam 60 to form an outer peripheral surface of the cam 60. Yes. Further, the outer peripheral surface of the cam 60 other than the protruding portion 60B is a non-projecting portion 60C.

  A pawl 62 as a restricting member is rotatably supported in the housing 20A below the cam 60, and the pawl 62 is parallel to the cam 60 in the axial direction. A contact portion 62A is provided on the upper portion of the pawl 62, and a spring 64 is connected to the contact portion 62A. The spring 64 biases the pawl 62 upward, and the pawl 62 is brought into contact with the outer peripheral surface of the cam 60 at the contact portion 62 </ b> A by the biasing force of the spring 64. Further, a pawl portion 62 </ b> B is provided at the lower portion of the pawl 62.

  A state in which the webbing 16 is fully wound (maximum limit) on the spool 14 (hereinafter referred to as “the webbing 16 of the webbing 16”) from a state where the webbing 16 is pulled out from the spool 14 and attached to the occupant (hereinafter referred to as “occupant wearing state of the webbing 16”) (For example, a state immediately before the webbing 16 is completely wound on the spool 14, and hereinafter referred to as an “intermediate winding state of the webbing 16”), the contact portion 62A of the pawl 62 is The state of being in contact with the non-projecting part 60C of the cam 60 is switched to the state of being in contact with the projecting part 60B of the cam 60. Thereby, the pawl 62 is rotated downward against the urging force of the spring 64 by the protrusion 60B.

  A damper shaft 30A of the rotary damper 30 is rotatably supported in the housing 20A, and a ratchet gear 66 is coaxially and integrally provided on the damper shaft 30A. The ratchet gear 66 is disposed below the pawl 62, and the pawl portion 62 </ b> B of the pawl 62 is engaged with the ratchet gear 66 when the pawl 62 is rotated downward.

  Here, when the mounting of the webbing 16 to the occupant is released and the spool 14 is rotated in the winding direction by the urging force of the mainspring spring 36, the damper gear of the rotary damper 30 is rotated by the connecting gear 22 in the resistance mechanism 20. 30B and the damper shaft 30A (including the ratchet gear 66) are rotated together, and in the switching mechanism 52, the cam 60 is decelerated via the first gear 54, the second gear 56, and the third gear 58 of the adapter 34. To be rotated.

  In the intermediate winding state of the webbing 16 from the occupant wearing state of the webbing 16 to the full winding state (for example, the state immediately before the webbing 16 is fully wound on the spool 14), the switching mechanism 52 contacts the pawl 62. The state where the part 62A is in contact with the non-projecting part 60C of the cam 60 is switched from the state in which it is in contact with the projecting part 60B of the cam 60, and the pawl 62 is rotated downward by the projecting part 60B. The pawl 62B of the pawl 62 is engaged with the ratchet gear 66, and the rotation of the ratchet gear 66 is restricted. As a result, the rotation of the damper shaft 30A is restricted, and the damper gear 30B is rotated with respect to the damper shaft 30A by the connecting gear 22 in the same manner as in the first embodiment, so that the spool 14 rotates in the winding direction ( The resistance force of the rotary damper 30 acts on the winding of the webbing 16 onto the spool 14.

  Therefore, as shown in FIG. 7, even if the time for which the spool 14 is rotated in the winding direction is increased by the biasing force applied by the mainspring spring 36, the winding of the spool 14 is continued after the intermediate winding state of the webbing 16. An increase in the rotational speed in the direction can be suppressed, and an increase in the winding speed of the webbing 16 around the spool 14 can be suppressed.

  Thereby, also in this embodiment, there can exist an effect | action and effect similar to the said 1st Embodiment.

  Further, the damper gear 30B and the damper shaft 30A are integrally rotated by the connecting gear 22 until the webbing 16 is in the intermediate winding state, thereby rotating the spool 14 in the winding direction (webbing). The resistance force of the rotary damper 30 does not act on the winding of the 16 spool 14 to the spool 14, and the increase in the rotational speed of the spool 14 in the winding direction (winding speed of the webbing 16 onto the spool 14) is not suppressed. As a result, the time from the occupant wearing state of the webbing 16 to the fully wound state can be shortened.

  In the present embodiment, the resistance of the rotary damper 30 to the rotation of the spool 14 in the winding direction (winding of the webbing 16 to the spool 14) corresponds to the winding amount of the webbing 16 to the spool 14. Switched whether to act. However, whether or not the resistance force of the rotary damper 30 is applied to the rotation of the spool 14 in the winding direction (winding of the webbing 16 to the spool 14) may be switched according to the temperature.

  For example, without providing the first gear 54, the second gear 56, the third gear 58, and the cam 60, an expansion / contraction member (for example, a bimetal) constituting the switching means is connected to the pawl 62, so that the expansion / contraction member expands / contracts due to temperature Thus, the pawl 62 may be rotated to switch whether the pawl portion 62B of the pawl 62 is engaged with the ratchet gear 66 or not. In this case, for example, when the temperature is higher than the normal temperature, the pawl portion 62B of the pawl 62 is engaged with the ratchet gear 66, and when the temperature is lower than the normal temperature, the pawl portion 62B of the pawl 62 is engaged with the ratchet. The gear 66 is not meshed. As a result, when the temperature is low, the biasing force applied by the mainspring spring 36 is reduced, while the resistance force applied by the rotary damper 30 is increased, so that the rotary damper 30 is rotated in the winding direction of the spool 14. Since the resisting force is not applied, the spool 14 can be rotated in the winding direction by the biasing force applied by the mainspring spring 36, and the webbing 16 can be wound around the spool 14.

  In the first and second embodiments, the rotary damper 30 (resisting means) is provided separately from the communication gear 22. However, the communication gear 22 may have the function of the rotary damper 30. In this case, the outer peripheral portion of the communication gear 22 is the damper gear 30B, and the inner peripheral portion (including the clutch mechanism 24) of the communication gear 22 is the damper shaft 30A. By rotating the peripheral portion, a resistance force is applied to the rotation of the inner peripheral portion of the connection gear 22, and the resistance force is applied to the rotation of the spool 14 in the winding direction (winding of the webbing 16 to the spool 14). Acted. In addition, a resistance is applied to the rotation of the spool 14 in the winding direction (winding of the webbing 16 to the spool 14) by switching whether or not the rotation of the outer peripheral portion of the communication gear 22 is restricted by the switching means. It can be switched whether or not.

  Furthermore, in the first embodiment and the second embodiment, the resistance force of the rotary damper 30 (resistance means) is applied to the spool 14. However, the resistance force of the resistance means may be applied to the webbing 16.

10 Webbing take-up device 14 Spool (winding member)
16 Webbing 24 Clutch mechanism (release means)
30 Rotating damper (resistance means)
36 Mainspring (biasing means)
50 Webbing take-up device 52 Switching mechanism (switching means)

Claims (4)

A webbing that can 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 biasing means for applying a biasing force in the winding direction to the winding member;
Resistance means for applying a resistance force to winding the webbing onto the winding member;
A webbing take-up device comprising:   The webbing take-up device according to claim 1, wherein the resistance force exerted by the resistance means is increased as the winding speed of the webbing to the take-up member increases.   Switching means for switching between when the resistance means applies a resistance force to winding the webbing onto the winding member and when the resistance means does not apply a resistance force to winding the webbing onto the winding member. A webbing take-up device according to claim 1 or 2, further comprising:   The webbing take-up device according to any one of claims 1 to 3, further comprising release means for releasing contact of the resistance means with the webbing when the webbing is pulled out from the take-up member.

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