JP5975846B2 - Pretensioner mechanism - Google Patents

Description

  The present invention relates to a pretensioner mechanism in which a rotating member is rotated by moving a moving member to increase an occupant's restraining force due to webbing.

  In the pretensioner device described in Patent Document 1 below, the force transmission element is moved by the gas pressure from one side in the longitudinal direction and moved through the guide portion, so that the turbine blades or teeth of the drive wheels bite into the force transmission element. As a result, the force transmission element rotates the driving wheel, and the safety belt is wound around the belt spool.

  Here, in this pretensioner device, the force transmission element is manufactured from a deformable material. For this reason, when the force transmission element is moved by the gas pressure from one side in the longitudinal direction to move the guide part, the force transmission element is expanded in diameter by the compression deformation in the longitudinal direction and slides on the guide part. Thus, there is a possibility that the movement of the force transmission element is limited by the guide portion, and the force transmission element cannot effectively rotate the driving wheel.

German Patent Application No. 102006031359

  An object of the present invention is to obtain a pretensioner mechanism in which a moving member can effectively rotate a rotating member in consideration of the above fact.

The pretensioner mechanism according to claim 1 includes a webbing capable of restraining an occupant of the vehicle, a rotating member that is provided with a biting portion and is rotated to increase the restraining force of the occupant by the webbing, a moving member for rotating said rotary member by biting of the biting portion by being moved, the provided on the side of the rotary member Rutotomoni, it is the rotating member and rotatable relative, the moving member is moved And a contact member that is rotated while the moving member is in contact therewith.

A pretensioner mechanism according to a second aspect is the pretensioner mechanism according to the first aspect , wherein a wall member provided on a side of the contact member opposite to the rotating member, and the contact member and the wall member And an intermediate portion provided in between and made rotatable.

A pretensioner mechanism according to a third aspect is the pretensioner mechanism according to the second aspect , wherein the contact member and the intermediate portion are relatively rotatable.

A pretensioner mechanism according to a fourth aspect is the pretensioner mechanism according to the second or third aspect , wherein the intermediate portion is provided on the outer side in the rotational radial direction of the contact member.

  In the pretensioner mechanism according to claim 1, when the moving member is moved, the moving member rotates the rotating member by biting into the moving member of the biting portion of the rotating member, and the restraining force of the occupant by webbing Is increased.

  Here, the contact member is provided on the side of the rotating member, and the contact member is rotated in a state where the moving member is in contact with the contact member by moving the moving member. For this reason, it can suppress that a moving member slides a contact member, can suppress that a movement of a moving member is restrict | limited by a contact member, and a moving member can rotate a rotating member effectively.

Further , the rotating member and the contact member are capable of relative rotation. For this reason, even when the rotating member is not rotated by the moving member, the contact member can be rotated by the moving member. Thereby, it can further suppress that a moving member slides on a contact member, can further suppress that a movement of a moving member is restrict | limited by a contact member, and a moving member can rotate a rotating member more effectively. it can.

In the pretensioner mechanism according to the second aspect , the wall member is provided on the side opposite to the rotating member of the contact member.

  Here, an intermediate portion is provided between the contact member and the wall member, and the intermediate portion is rotatable. For this reason, it can suppress by a middle part that a contact member slides a wall member, can suppress that a movement of a moving member is restrict | limited by a wall member via a contact member, and a moving member makes a rotation member more effective. Can be rotated.

In the pretensioner mechanism according to the third aspect , the contact member and the intermediate portion are relatively rotatable. For this reason, it can suppress that the sliding force with the wall member of an intermediate part acts on a contact member, can suppress that the movement of a moving member is restricted by a wall member via a contact member and an intermediate part, and a moving member Can rotate the rotating member more effectively.

In the pretensioner mechanism according to a fourth aspect of the present invention, an intermediate portion is provided on the outer side in the rotational radial direction of the contact member. For this reason, when the moving member is brought into contact with the contact member, the contact member is tilted and the moving member can be prevented from sliding on the wall member, and the movement of the moving member can be prevented from being restricted by the wall member. The moving member can rotate the rotating member more effectively.

It is a front view which shows the webbing take-up device in the first embodiment of the present invention. It is the side view seen from one side which shows the webbing winding device in a 1st embodiment of the present invention. It is sectional drawing (3-3 line sectional drawing of FIG. 1) seen from one side which shows the webbing winding apparatus in 1st Embodiment of this invention. It is sectional drawing (3-3 line position sectional drawing of FIG. 1) which shows the time of the action | operation of the pretensioner mechanism which concerns on 1st Embodiment of this invention. It is sectional drawing (5-5 sectional view taken on the line of FIG. 2) seen from the bottom which shows the webbing winding apparatus in 1st Embodiment of this invention. It is a perspective view which shows the rotary body and cylinder of the pretensioner mechanism which concern on 1st Embodiment of this invention. It is a perspective view which shows the rotating plate and spacer of the pretensioner mechanism which concern on 1st Embodiment of this invention. (A) And (B) is a figure which shows the rotating plate and spacer of the pretensioner mechanism which concern on 2nd Embodiment of this invention, (A) is a perspective view, (B) is sectional drawing. is there. (A) And (B) is a figure which shows the rotating plate and spacer of the pretensioner mechanism which concern on 3rd Embodiment of this invention, (A) is a perspective view, (B) is sectional drawing. is there. (A) And (B) is a figure which shows the rotating plate and spacer of the pretensioner mechanism which concern on 4th Embodiment of this invention, (A) is a perspective view, (B) is sectional drawing. is there.

[First Embodiment]
FIG. 1 shows a front view of a webbing take-up device 10 to which a pretensioner mechanism 32 according to a first embodiment of the present invention is applied. FIG. 2 shows the webbing take-up device 10 on one side. It is shown in the side view seen from the direction. Further, FIG. 5 shows the webbing take-up device 10 in a sectional view (sectional view taken along line 5-5 in FIG. 2) as seen from below. 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, 2, and 5, the webbing take-up device 10 according to the present embodiment is provided with a metal-made U-shaped plate-shaped frame 12 as a support member. A back plate 12A on the back side, 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 winding shaft 14 is rotatably supported between the leg plate 12B and the leg plate 12C of the frame 12.

  The take-up shaft 14 is provided with a substantially cylindrical spool 16 as a take-up member, and the other end of the spool 16 on the leg plate 12C side penetrates the leg plate 12C in a rotatable manner. A long belt-like webbing 18 (belt) is wound on 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 possible to attach to. Further, when the spool 16 is rotated in the winding direction (the direction of the arrow A in FIG. 2), the webbing 18 is wound around the spool 16 and the webbing 18 is pulled out from the spool 16 so that the spool 16 is It is rotated in the drawing direction (the direction of arrow B in FIG. 2).

  The winding shaft 14 is provided with a metal rotating body 20 (see FIG. 6) as a rotating member.

  The rotating body 20 is provided with a torsion shaft 22 as an energy absorbing part constituting a force limiter mechanism, and the torsion shaft 22 is coaxially inserted into the spool 16. The one end 22A on the leg plate 12B side of the torsion shaft 22 is disposed so as to be relatively rotatable within one end on the leg plate 12B side of the spool 16, and the other end 22B on the leg plate 12C side of the torsion shaft 22 is disposed on the leg plate 12C side of the spool 16. The rotating body 20 is made rotatable with the spool 16 so as to be relatively non-rotatable.

  The rotating body 20 is provided with a substantially disc-shaped lock gear 24 as a restricting portion (lock portion) on the leg plate 12B side of the torsion shaft 22, and the lock gear 24 passes through the leg plate 12B in a rotatable manner. . The lock gear 24 is connected to one end 22A of the torsion shaft 22, and the lock gear 24 is disposed coaxially with the torsion shaft 22 and is integrally rotatable. Further, ratchet teeth 24 </ b> A (external teeth) are formed on the entire outer periphery of the lock gear 24.

  The rotating body 20 is provided with a pinion 26 as a rotating portion on the opposite side of the lock gear 24 from the torsion shaft 22. The pinion 26 is formed integrally with the lock gear 24 and is coaxial with the lock gear 24. It is arranged and can rotate integrally. A rectangular plate-like pinion tooth 26A as a biting portion is formed to protrude on the entire outer periphery of the pinion 26, and the tip of the pinion tooth 26A has a pointed shape with a triangular cross section. Further, in the pinion 26, the space between the pinion teeth 26A is opened on the radially outer side of the pinion 26 and on the side opposite to the lock gear 24, and the lock gear 24 side is closed.

  The rotating body 20 is provided with a columnar (disc-shaped) arrangement shaft 52 as an arrangement portion on the opposite side of the pinion 26 from the lock gear 24, and the arrangement shaft 52 is formed integrally with the pinion 26. Thus, it is arranged coaxially with respect to the pinion 26 and can rotate integrally.

  The rotating body 20 is provided with a support shaft 28 as a shaft portion on the opposite side of the arrangement shaft 52 from the pinion 26, and the support shaft 28 is formed integrally with the arrangement shaft 52. On the other hand, it is arranged on the same axis and is rotatable integrally.

  A mainspring spring (not shown) as an urging means is installed on the outer side of the leg plate 12C of the frame 12, and the mainspring spring is connected to the rotating body 20 (torsion shaft 22) and is wound around the spool 16 in the winding direction. The urging force is applied.

  A lock mechanism 30 (see FIG. 5) as a restricting means (lock means) can be communicated with the lock gear 24 of the rotating body 20, and a lock plate (as a restricting member (lock member)) is connected to the lock mechanism 30. (Not shown) is provided. The lock plate is rotatably supported on the leg plate 12B of the frame 12 and has lock teeth. When the webbing 18 is pulled out from the spool 16 or when the vehicle is suddenly decelerated, the lock mechanism is activated. Thus, the lock plate is rotated and the lock teeth are engaged (engaged) with the ratchet teeth 24 </ b> A of the lock gear 24. As a result, rotation of the lock gear 24 in the pull-out direction is restricted (locked), and rotation of the spool 16 in the pull-out direction is restricted (rotation in the winding direction of the spool 16 is allowed).

  A pretensioner mechanism 32 is provided outside the leg plate 12 </ b> B of the frame 12, and the pinion 26 and the arrangement shaft 52 of the rotating body 20 constitute the pretensioner mechanism 32.

  A metal frame-like body 34 is fixed to the outside of the leg plate 12B of the frame 12, and the pinion 26 and the arrangement shaft 52 of the rotating body 20 are arranged in the body 34. On the opposite side of the body 34 from the leg plate 12B, a metal flat plate cover plate 36 is fixed as a wall member. The cover plate 36 is closed on the opposite side of the body 34 from the leg plate 12B. Yes.

  A support shaft 28 of the rotator 20 is passed through the cover plate 36, and the cover plate 36 rotatably supports the support shaft 28 of the rotator 20. A substantially C-shaped K ring 38 as a fixing member is fitted and fixed to the support shaft 28 on the side opposite to the leg plate 12B from the cover plate 36, and the K ring 38 is locked to the cover plate 36. As a result, the detachment of the rotating body 20 from the cover plate 36 is restricted.

  A rotating plate 54 (see FIG. 7) made of metal as a contact member is rotatably supported on the arrangement shaft 52 of the rotating body 20, and the arrangement shaft 52 is coaxial with the rotation plate 54. It is penetrated and is rotatable relative to the rotating body 20 (including the pinion 26) and the cover plate 36. The rotating plate 54 is disposed between the pinion 26 and the cover plate 36, and the diameter (outer diameter) of the rotating plate 54 is made larger (the same as the diameter (maximum diameter) of the pinion 26). May be better or smaller).

  A metal annular ring-shaped spacer 56 (see FIG. 7) as an intermediate portion is rotatably supported on the arrangement shaft 52 of the rotating body 20 on the cover plate 36 side of the rotating plate 54. The arrangement shaft 52 is coaxially penetrated inside, and is rotatable relative to the rotating body 20 (including the pinion 26), the cover plate 36, and the rotating plate 54. The spacer 56 is disposed between the rotating plate 54 and the cover plate 36, and the diameter (outer diameter) of the spacer 56 is smaller than the diameter (outer diameter) of the rotating plate 54.

  A cylinder 40 (see FIG. 6) made of metal as a cylindrical member is fixed to the upper portion of the body 34, and the cylinder 40 extends upward from the body 34. The lower part (tip part) of the cylinder 40 is disposed on the back plate 12A side of the pinion 26 in the body 34, and the lower part of the cylinder 40 is formed with an opening 42 on the pinion 26 side, and the inside is on the pinion 26 side. It is open.

  As shown in FIG. 3, a substantially cylindrical gas generator 44 as a moving means is inserted and fixed at the upper end (base end) in the cylinder 40. The gas generator 44 closes the upper end of the cylinder 40. Yes. The gas generator 44 is electrically connected to the control device 46 of the vehicle, and when the vehicle collides (when a vehicle collision is detected, a predetermined opportunity that is an emergency of the vehicle), the gas generator 44 By operating the pretensioner mechanism 32 by the control, the gas generator 44 instantaneously generates a high-pressure gas and supplies it to the upper end in the cylinder 40.

  A cylindrical rack 50 as a moving member is provided in the cylinder 40, and the rack 50 is disposed from the lower side of the gas generator 44 to the position of the upper end of the opening 42 of the cylinder 40, and in the cylinder 40. It is mated. The material of the rack 50 is made of a soft resin such as nylon (PA), polyvinyl chloride (PVC), or elastomer, and the rack 50 can be easily eaten by the pinion teeth 26A of the pinion 26 (particularly, can be pierced). In addition, it can be bent and deformed in the direction perpendicular to the axis.

  A metal box-like case 58 as an accommodating member is fixed to the outside of the leg plate 12B of the frame 12 on the lower side of the body 34. The inside of the case 58 is opened upward and the inside of the body 34 is lowered. The case 58 communicates with the body 34 by being opened to the side.

  Next, the operation of this embodiment will be described.

  In the webbing take-up device 10 configured as described above, when the webbing 18 is pulled out from the spool 16 and the webbing 18 is attached to an occupant seated on a vehicle seat, the mainspring spring is attached to the spool 16 in the take-up direction. The slack of the webbing 18 is removed by applying the force.

  When the vehicle collides, the webbing 18 is suddenly pulled out from the spool 16 or the vehicle is decelerated suddenly and the lock mechanism is operated, whereby the lock teeth of the lock plate are engaged with the ratchet teeth 24A of the lock gear 24. As a result, the rotation of the lock gear 24 in the pull-out direction is restricted, and the rotation of the spool 16 in the pull-out direction is restricted, so that the webbing 18 is pulled out from the spool 16 and the webbing 18 restrains the occupant. To do.

  Further, as shown in FIG. 4, in the event of a vehicle collision, the pretensioner mechanism 32 is operated under the control of the control device 46, so that the gas generator 44 instantaneously generates high-pressure gas and reaches the upper end in the cylinder 40. Supply. For this reason, the rack 50 is moved to the lower side (the other side in the longitudinal direction of the rack 50, the other side) by receiving the pressure (moving force) of the gas from the upper side (one side in the longitudinal direction, one side). The As a result, the rack 50 is exposed to the pinion 26 side from the opening 42 in the lower part of the cylinder 40, and the movement of the rack 50 to the opposite side to the pinion 26 is restricted by the peripheral wall on the opposite side to the pinion 26 in the lower part of the cylinder 40. When the pinion teeth 26A of the pinion 26 bite into the rack 50 (particularly, pierce), the pinion 26 is rotated in the winding direction by the downward movement of the rack 50, and the spool 16 is rotated in the winding direction. Is done. For this reason, the webbing 18 is wound around the spool 16, and the restraining force of the occupant by the webbing 18 is increased.

  Further, the rack 50 that moves downward through the pinion 26 is accommodated in the case 58.

  Here, when the pretensioner mechanism 32 is operated, the rack 50 is moved downward, so that the rack 50 comes into contact with the rotating plate 54, and the rotating plate 54 is wound by the frictional force with the rack 50. It is rotated in the taking direction. For this reason, even if the rack 50 is compressed and deformed in the longitudinal direction (axial direction) by applying the pressure of the gas from the gas generator 44 from the upper side, the rack 50 is rotated and the cover plate and the cover plate. 36 can be prevented or suppressed from sliding, and the downward movement of the rack 50 can be prevented or suppressed from being restricted by the rotating plate 54 and the cover plate 36, and the operating loss of the pretensioner mechanism 32 can be reduced. . Accordingly, the rack 50 can effectively rotate the pinion 26 in the winding direction, the spool 16 can be effectively rotated in the winding direction, and the restraining force of the occupant by the webbing 18 can be effectively reduced. Can be increased.

  Further, the rotation plate 54 is rotatable relative to the pinion 26. Therefore, even when the rack 50 moved downward reaches the rotating plate 54 but does not reach the pinion 26, even when the pinion 26 is not rotated in the winding direction by the rack 50, the rotating plate 54. Can be rotated in the winding direction by moving the rack 50 downward. Accordingly, the rack 50 can be further prevented or suppressed from sliding with the rotating plate 54, and the downward movement of the rack 50 can be further prevented or suppressed from being restricted by the rotating plate 54, and the pretensioner mechanism 32 can be prevented. Can be further reduced, and the restraining force of the occupant by the webbing 18 can be increased more effectively.

  A spacer 56 is disposed between the rotating plate 54 and the cover plate 36. For this reason, when the rotating plate 54 is rotated in the winding direction by the downward movement of the rack 50, the spacer 56 can prevent the rotating plate 54 from sliding on the cover plate 36. The downward movement can be prevented from being restricted by the cover plate 36 via the rotating plate 54, the operating loss of the pretensioner mechanism 32 can be further reduced, and the restraining force of the occupant by the webbing 18 can be increased more effectively. Can be made.

  Further, the spacer 56 is rotatable relative to the rotating plate 54. Therefore, the sliding force of the spacer 56 with the cover plate 36 can be prevented from acting on the rotating plate 54, and the downward movement of the rack 50 is restricted by the cover plate 36 via the rotating plate 54 and the spacer 56. Therefore, the operating loss of the pretensioner mechanism 32 can be further reduced, and the restraining force of the occupant by the webbing 18 can be increased more effectively.

  In addition, the diameter of the spacer 56 is made smaller than the diameter of the rotating plate 54. Therefore, the sliding force of the spacer 56 with respect to the rotating plate 54 and the cover plate 36 can be reduced, and the downward movement of the rack 50 is further limited by the cover plate 36 via the rotating plate 54 and the spacer 56. Therefore, the operation loss of the pretensioner mechanism 32 can be further reduced, and the restraining force of the occupant by the webbing 18 can be increased more effectively.

  In the present embodiment, the diameter (outer diameter) of the spacer 56 is made smaller than the diameter (outer diameter) of the rotating plate 54. However, the diameter (outer diameter) of the spacer 56 may be the same as or larger than the diameter (outer diameter) of the rotating plate 54.

[Second Embodiment]
FIG. 8A shows a perspective view of the rotating plate 54 and the spacer 56 of the webbing take-up device 60 according to the second embodiment of the present invention. FIG. 8B shows the rotating plate 54. And spacers 56 are shown in cross-section.

  The webbing take-up device 60 in the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 8A and 8B, in the pretensioner mechanism 32 of the webbing take-up device 60 in the present embodiment, the spacer 56 is formed integrally with the rotary plate 54, and the spacer 56 is a rotary plate. The relative rotation with respect to 54 is disabled.

  Here, also in the present embodiment, operations and effects similar to those of the first embodiment can be achieved except for the operation and effects caused by the spacer 56 being rotatable relative to the rotating plate 54.

[Third Embodiment]
FIG. 9A shows a perspective view of the rotating plate 54 and the spacer 56 of the webbing take-up device 70 according to the third embodiment of the present invention, and FIG. The rotating plate 54 and the spacer 56 are shown in a sectional view.

  The webbing take-up device 70 in the present embodiment has substantially the same configuration as that of the second embodiment, but differs in the following points.

  As shown in FIGS. 9A and 9B, in the pretensioner mechanism 32 of the webbing take-up device 70 in the present embodiment, a conical convex rib 72 as an intermediate portion is formed on the radially outer portion of the rotating plate 54. A plurality (four in this embodiment) are integrally formed, and the plurality of convex ribs 72 are arranged at equal intervals in the circumferential direction of the rotating plate 54. The protruding rib 72 protrudes from the rotating plate 54 toward the cover plate 36, and the protruding height of the protruding rib 72 from the rotating plate 54 is the same as the protruding height of the spacer 56 from the rotating plate 54. Yes. For this reason, the convex rib 72 can be brought into point contact with the cover plate 36.

  Here, also in this embodiment, the same operation and effect as in the second embodiment can be obtained.

  Further, a plurality of convex ribs 72 in the radially outer portion of the rotating plate 54 can be brought into contact with the cover plate 36. For this reason, when the rack 50 moved downward contacts the rotating plate 54, the rotating plate 54 can be prevented from being tilted and the rack 50 can be prevented from sliding on the cover plate 36. It is possible to effectively prevent the movement from being restricted by the cover plate 36, to effectively reduce the operating loss of the pretensioner mechanism 32, and to increase the restraining force of the occupant by the webbing 18 more effectively.

  In addition, the convex rib 72 can be brought into point contact with the cover plate 36. For this reason, the sliding force of the convex rib 72 with the cover plate 36 can be reduced, and the downward movement of the rack 50 can be suppressed from being restricted by the cover plate 36 via the rotating plate 54 and the convex rib 72. The operating loss of the pretensioner mechanism 32 can be further reduced, and the restraining force of the occupant by the webbing 18 can be increased more effectively.

[Fourth Embodiment]
FIG. 10 (A) shows a perspective view of the rotating plate 54 and the spacer 56 of the webbing take-up device 80 according to the fourth embodiment of the present invention. FIG. The rotating plate 54 and the spacer 56 are shown in a sectional view.

  The webbing take-up device 80 in the present embodiment has substantially the same configuration as that of the third embodiment, but differs in the following points.

  As shown in FIGS. 10A and 10B, in the pretensioner mechanism 32 of the webbing take-up device 80 in the present embodiment, the convex rib 72 is not formed on the rotating plate 54.

  A cylindrical tube rib 82 as an intermediate portion is integrally formed at the radially outer end of the rotating plate 54, and the tube rib 82 projects from the rotating plate 54 toward the cover plate 36. The protruding height of the cylindrical rib 82 from the rotating plate 54 is the same as the protruding height of the spacer 56 from the rotating plate 54, and the cylindrical rib 82 can be brought into surface contact with the cover plate 36.

  Here, also in the present embodiment, the same operations and effects as those of the third embodiment can be achieved except for the operations and effects due to the convex rib 72 being able to make point contact with the cover plate 36.

  In the third and fourth embodiments, the protruding height of the convex rib 72 or the cylindrical rib 82 from the rotating plate 54 is the same as the protruding height of the spacer 56 from the rotating plate 54. However, the protruding height of the convex rib 72 or the cylindrical rib 82 from the rotating plate 54 may be higher or lower than the protruding height of the spacer 56 from the rotating plate 54.

  Further, in the third embodiment and the fourth embodiment, the spacer 56 is integrated with the rotating plate 54 so as not to rotate relative to the rotating plate 54. However, the spacer 56 may be separated from the rotating plate 54 so as to be rotatable relative to the rotating plate 54, and the spacer 56 may not be provided.

  Further, in the first to fourth embodiments, the rotating plate 54 is separated from the rotating body 20 (arrangement shaft 52) and is rotatable relative to the rotating body 20. However, the rotating plate 54 may be integrated with the rotating body 20 (arrangement shaft 52) so as not to rotate relative to the rotating body 20.

  Furthermore, in the said 1st Embodiment-4th Embodiment, the cylinder 40 (longitudinal direction of the cylinder 40) was made into linear form. However, the cylinder 40 (longitudinal direction of the cylinder 40) may be curved. In this case, the rack 50 is also curved as the cylinder 40 is curved. Thus, the rack 50 can be lengthened without increasing the occupied space of the cylinder 40 and hence the occupied space of the webbing take-up devices 10, 60, 70, 80, and the webbing 18 to the spool 16 by the operation of the pretensioner mechanism 32. The amount of winding can be increased. For this reason, the webbing retractor 10, 60, 70, 80 can be prevented from being enlarged, and the restraining force of the occupant by the webbing 18 can be greatly increased by the operation of the pretensioner mechanism 32.

  Further, the present invention may be applied to an operation mechanism that is operated by movement of a moving member such as a selectable force limiter switching mechanism, a lap pretensioner mechanism, or a buckle pretensioner mechanism in a seat belt device.

18 Webbing 20 Rotating body (Rotating member)
26A pinion teeth (break-in part)
32 Pretensioner mechanism 36 Cover plate (wall member)
50 racks (moving members)
54 Rotating plate (contact member)
56 Spacer (middle part)
72 Convex rib (middle part)
82 Tube rib (intermediate part)

Claims (4)

Webbing made possible to restrain vehicle occupants,
A rotary member provided with a bite portion and rotated to increase the restraining force of the occupant by the webbing,
A moving member that rotates the rotating member by being bitten by the biting part,
Wherein provided on the side of the rotary member Rutotomoni, the it is the rotating member and rotatable relative, and the contact member to which the moving member is rotated in a state where the moving member is contacted by the moving,
Pretensioner mechanism with A wall member provided on the opposite side of the contact member from the rotating member;
An intermediate portion provided between the contact member and the wall member and made rotatable;
The pretensioner mechanism according to claim 1, comprising: The pretensioner mechanism according to claim 2, wherein the contact member and the intermediate part are rotatable relative to each other . 4. The pretensioner mechanism according to claim 2, wherein the intermediate portion is provided on an outer portion in the rotation radial direction of the contact member .

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