WO2019026559A1

WO2019026559A1 - Webbing winding device

Info

Publication number: WO2019026559A1
Application number: PCT/JP2018/025938
Authority: WO
Inventors: 隆浩田中; 弥梁川; 真一大久保
Original assignee: 株式会社東海理化電機製作所
Priority date: 2017-08-03
Filing date: 2018-07-09
Publication date: 2019-02-07
Also published as: JP2019026217A

Abstract

When stopping movement of a moving member toward the axial tip side in this webbing winding device, the moving member is folded back in the axial direction at an outside end section of a folding path in the width direction of a vehicle. In addition, the curvature of the moving member in the axial direction in the part that is folded back is maximized in the entire axial range of the moving member. As a result, it is possible to effectively limit movement of the moving member toward the axial tip side and to effectively stop movement of the moving member toward the axial tip side.

Description

Webbing winding device

The present invention relates to a webbing retractor in which a rotating member is rotated to one side and a spool is rotated in a winding direction.

In the belt winding device described in JP-A-2014-500178, the force transmission element is axially moved and engaged with the drive wheel so that the force transmission element rotates the drive wheel in the winding direction. The belt reel is rotated in the winding direction.

Here, in such a belt winding device, it is preferable that the movement of the force transmission element can be effectively stopped after the force transmission element rotates the drive wheel in the winding direction.

An object of the present invention is to obtain a webbing retractor capable of effectively stopping the movement of a moving member in consideration of the above fact.

The webbing take-up device according to the first aspect of the present invention is a spool on which the webbing of the seat belt device is taken up by being rotated in the take-up direction, and a rotating member that is rotated to one side and the spool is rotated in the take-up direction. A moving member for moving the rotating member to one side by being moved in the axial direction and engaged with the rotating member, and moving in one direction after the moving member rotates the rotating member to one side And a stopping means provided on one side of the moving path for stopping movement of the moving member, and provided on the moving path in the other direction of the stopping means, the stopping means being the movement When stopping the movement of the member, the moving member is folded back in the axial direction, and the curvature in the axial direction at the folded part of the moving member is maximized in the range of the moving member disposed in the moving path When Comprising a road, a.

In the webbing take-up device according to the first aspect of the present invention, the stopping means is provided on one side of the moving path, and the moving member is moved in one direction after rotating the rotating member to one side. At the same time, the stopping means stops the movement of the moving member.

Here, the return path is provided on the moving path on the other side of the stopping means, and when the stopping means stops the movement of the moving member, the moving member is folded back in the axial direction on the turning path, and The curvature in the axial direction at that turnup of the is maximized in the area of the moving member arranged in the moving path. Therefore, the movement of the moving member can be effectively restricted, and the movement of the moving member can be effectively stopped.

It is an exploded perspective view of a webbing take-up device concerning a 1 embodiment of the present invention. It is the side view which looked at the inner side of the cover plate from the vehicle front side. It is a side view corresponding to FIG. 2 which shows the state in which the small diameter part and conical part of the movement member were collided with the 1st tooth and the 2nd tooth of rotation member. FIG. 7 is a side view corresponding to FIG. 3 showing the conical portion of the moving member moved to between the rotating member and the outer wall of the side wall; It is a side view corresponding to FIG. 4 which shows the state which the conical part of the movement member contact | abutted to the upper wall inner side of the side wall. FIG. 16 is a side view corresponding to FIG. 5 showing the conical portion of the moving member being abutted against the longitudinal proximal end of the stopper; It is a side view corresponding to FIG. 6 which shows the state which the stopper pressed by the conical part of the movement member was moved, and was contact | abutted by the movement member main body of the movement member. It is a side view corresponding to FIG. 7 which shows the state to which the stopper was moved to the engagement part of a moving member main body and a rotation member. FIG. 5 is an enlarged side view showing the moving member slightly moved from the position of FIG. 4;

Next, an embodiment of the present invention will be described based on FIGS. 1 to 9. In each of the drawings, the arrow FR indicates the front side of the vehicle to which the webbing retractor 10 is applied, the arrow OUT indicates the outer side in the vehicle width direction, and the arrow UP indicates the upper side of the vehicle. Further, in each drawing, the arrow A indicates a winding direction which is the rotation direction of the spool 18 when the spool 18 winds the webbing 20, and the arrow B indicates a pulling direction opposite to the winding direction. Furthermore, the arrow C indicates the tip end side in the longitudinal direction of the stopper 92 that constitutes the stopping means.

<Configuration of the present embodiment>
As shown in FIG. 1, the webbing retractor 10 according to the present embodiment includes a frame 12. The frame 12 is fixed to a lower portion of a center pillar (not shown) as a vehicle body of the vehicle.

Further, the frame 12 is provided with a spool 18. The spool 18 is formed in a substantially cylindrical shape, and is rotatable around a central axis (the direction of arrow A and the direction of arrow B in FIG. 1). The longitudinal base end portion of the elongated belt-like webbing 20 is engaged with the spool 18, and when the spool 18 is rotated in the winding direction (the direction of arrow A in FIG. 1 etc.), the webbing 20 is elongated It is wound on the spool 18 from the direction proximal side. The longitudinal tip end of the webbing 20 extends from the spool 18 to the upper side of the vehicle and passes through slit holes formed in through anchors (not shown) supported by the center pillar on the upper side of the frame 12 to the lower side of the vehicle. It has been folded back.

Furthermore, the longitudinal tip of the webbing 20 is locked to an anchor plate (not shown). The anchor plate is formed of a metal plate material such as iron and fixed to a floor portion (not shown) of a vehicle or a frame member or the like of a sheet (not shown) corresponding to the webbing retractor 10.

A seat belt device for a vehicle to which the webbing retractor 10 is applied includes a buckle device (not shown). The buckle device is provided on the inner side in the vehicle width direction of a sheet (not shown) to which the webbing retractor 10 is applied. The webbing 20 is mounted on the occupant's body by the tongue (not shown) provided on the webbing 20 being engaged with the buckle device while the webbing 20 is wound around the body of the occupant seated on the seat. .

Further, as shown in FIG. 1, a spring housing 22 is provided on the vehicle rear side of the frame 12. Inside the spring housing 22, a spool biasing means (not shown) such as a mainspring spring is provided. The spool biasing means is directly or indirectly engaged with the spool 18, and the spool 18 is biased in the winding direction (the direction of arrow A in FIG. 1) by the biasing force of the spool biasing means.

Furthermore, the webbing retractor 10 includes a torsion bar 24 that constitutes a force limiter mechanism. The vehicle rear side portion of the torsion bar 24 is disposed inside the spool 18 and is connected to the spool 18 in a state where relative rotation with respect to the spool 18 is limited. On the other hand, the vehicle front portion of the torsion bar 24 extends to the outside (vehicle front) of the frame 12 through the hole formed in the frame 12.

A rotating member 28 of the pretensioner 26 is provided on the front side of the frame 12 of the vehicle. The rotating member 28 includes a first rotating unit 30. The first rotating portion 30 is disposed coaxially with the spool 18, and the first rotating portion 30 is coaxially provided with a substantially disc-shaped first opposing plate 30A as an opposing portion. The vehicle front side portion of the torsion bar 24 is connected to the first rotating portion 30, and the relative rotation of the rotation member 28 with respect to the vehicle front side portion of the torsion bar 24 is limited. Moreover, the 1st rotation part 30 of the rotation member 28 is equipped with multiple 1st teeth 34 as an engaging part in the vehicle front side and inner side of 30 A of 1st opposing plates. These first teeth 34 are formed around the central axis of the first rotating portion 30 at a predetermined interval.

Furthermore, on the vehicle front side of the first rotating portion 30, a second rotating portion 36 which constitutes the rotating member 28 together with the first rotating portion 30 is provided coaxially, and the second rotating portion 36 is provided as a facing portion. A substantially disk-shaped second opposing plate 36A is coaxially provided. The second opposing plate 36A is opposed to the first opposing plate 30A of the first rotating portion 30 in the axial direction of the spool 18, and the second rotating portion 36 is on the vehicle rear side and the inner side of the second opposing plate 36A. And a plurality of second teeth 40 as engaging portions. These second teeth 40 are formed at predetermined intervals around the central axis of the second rotating portion 36, and each of the second teeth 40 is a rotating member as viewed in the central axial direction of the rotating member 28. The first rotary portion 30 is disposed substantially at the center between the first teeth 34 of the first rotary portion 30 adjacent to each other around the central axis of the first rotary portion 30. In this state, the second rotating unit 36 is connected to the first rotating unit 30, and the relative movement of the second rotating unit 36 with respect to the first rotating unit 30 is restricted.

In addition, a vehicle front side portion of the second rotating portion 36 is used as a lock base 44 of the lock mechanism 42. The lock base 44 includes a lock pawl 48. The lock pawls 48 are supported by bosses 46 formed on the lock base 44 and are rotatable around the bosses 46.

On the other hand, a cover plate 50 which constitutes both the lock mechanism 42 and the pretensioner 26 is fixed to the leg plate 12A on the vehicle front side of the frame 12. The cover plate 50 is opened to the rear side of the vehicle, and the bottom plate 52 of the cover plate 50 is opposed to the frame 12 in a state of being separated from the frame 12 to the front side of the vehicle. The bottom plate 52 is formed with a ratchet hole 54. A ratchet tooth is formed on the inner peripheral portion of the ratchet hole 54, and when the lock pawl 48 of the lock base 44 is rotated to one side around the boss 46, the tip of the lock pawl 48 is a ratchet of the ratchet hole 54. Chew on teeth. Thus, the rotation of the lock base 44 in the pull-out direction (the direction of the arrow B in FIG. 1 etc.) is limited, and the rotation of the spool 18 in the pull-out direction is indirectly limited.

Further, on the front side of the cover plate 50, a sensor holder 56 of the lock mechanism 42 is provided. The sensor holder 56 is opened to the rear side of the vehicle, and is fixed to the frame 12 directly or indirectly via the cover plate 50. Inside the sensor holder 56 are housed parts constituting a sensor mechanism for detecting an emergency state of the vehicle, and when the sensor mechanism in the sensor holder 56 is activated in the event of a vehicle emergency, the lock base of the lock mechanism 42 The lock pawl 48 of the lock base 44 is pivoted to one side around the boss 46 in conjunction with the rotation of the lock base 44 in the pull-out direction.

On the other hand, the webbing retractor 10 is provided with a cylinder 58 as a cylindrical member that constitutes the pretensioner 26. The cylinder 58 is formed in a cylindrical shape, and the axial base end of the cylinder 58 is disposed on the vehicle rear upper side of the frame 12. At an axially proximal end of the cylinder 58, a micro gas generator 60 (hereinafter, the micro gas generator 60 is referred to as "MGG 60") as a fluid supply means is inserted. The MGG 60 is electrically connected to a collision detection sensor (both not shown) provided on the vehicle via an ECU as control means, and when an impact at the time of a vehicle collision is detected by the collision detection sensor, the MGG 60 Is operated by the ECU, and a gas, which is an aspect of the fluid generated in the MGG 60, is supplied to the inside of the cylinder 58.

Inside the cylinder 58 of the pretensioner 26, a seal ball 62 as a piston is disposed. The seal ball 62 is formed of a synthetic resin material, and the shape of the seal ball 62 in a state where no load is applied to the seal ball 62 is substantially spherical. The inner space of the cylinder 58 is partitioned by the seal ball 62 into the axially proximal end side with respect to the seal ball 62 and with the axially distal end side with respect to the seal ball 62. When the MGG 60 is actuated, the gas generated by the MGG 60 is supplied between the MGG 60 and the seal ball 62 in the cylinder 58. Thereby, when the internal pressure is increased between the MGG 60 and the seal ball 62 in the cylinder 58, the seal ball 62 is moved to the axial tip end side of the cylinder 58 and compressed and deformed in the axial direction of the cylinder 58. Ru.

In addition, inside the cylinder 58 of the pretensioner 26, a moving member 64 is disposed. The moving member 64 is made of a synthetic resin material, and can be deformed by receiving an external force. The moving member 64 is disposed on the axial tip end side of the cylinder 58 relative to the seal ball 62. When the seal ball 62 is moved to the axial tip end side of the cylinder 58, the moving member 64 presses the seal ball 62. It is moved to the axial direction tip side of the cylinder 58.

Furthermore, the moving member 64 is provided with a moving member main body 66. The moving member main body 66 is formed in a cylindrical rod shape. A small diameter portion 68 as a second leading end portion is formed at the axial direction leading end of the moving member main body 66. The small diameter portion 68 is formed in a cylindrical shape, the outer diameter dimension of the small diameter portion 68 is smaller than the outer diameter dimension of the moving member main body 66, and the small diameter portion 68 is disposed coaxially to the moving member main body 66 . A conical portion 70 as a first leading end portion is formed at the axial direction leading end (the end of the small diameter portion 68 opposite to the moving member main body 66) of the moving member 64 in the small diameter portion 68. The conical portion 70 has a conical or frusto-conical shape coaxial with the moving member main body 66, and the outer diameter of the conical portion 70 corresponds to the axial tip side of the conical portion 70 (the small diameter portion 68 of the conical portion 70 Is smaller towards the other side).

On the other hand, the cylinder 58 of the pretensioner 26 is bent at an axially intermediate portion, and the axial tip end of the cylinder 58 is disposed on the vehicle front side on the vehicle front side of the frame 12 and is sandwiched between the cover plate 50 and the frame 12 Is held. An axial tip end of the cylinder 58 is opened substantially in the lower side of the vehicle (more specifically, in a direction inclined outward in the vehicle width direction with respect to the lower side of the vehicle).

As shown in FIG. 2, the axial tip end of the moving member 64 protrudes from the axial tip of the cylinder 58 to the lower side of the vehicle and enters the inside of the cover plate 50. When the moving member 64 is pressed by the seal ball 62 and the small diameter portion 68 and the conical portion 70 of the moving member 64 are moved to the vehicle lower side, as shown in FIG. The small diameter portion 68 collides with the other of the first teeth 34 and the second teeth 40 while colliding with one of the first teeth 34 and the second teeth 40 of the second rotating portion 36. In this state, when one of the first teeth 34 and the second teeth 40 is pressed downward by the moving member 64, the rotating member 28 is rotated in the winding direction (the direction of the arrow A in FIG. 3 etc.) The moving member 64 is further moved to the lower side of the vehicle by the pressure from the seal ball 62.

Thus, as the moving member 64 is moved downward in the vehicle and the rotating member 28 is rotated in the winding direction, as shown in FIG. 4, the first teeth of the first rotating portion 30 of the rotating member 28. 34 and the second teeth 40 of the second rotating portion 36 pierce (engage, engage with) the moving member 64, and in this state, the moving member 64 is further moved to the lower side of the vehicle, whereby the rotating member 28 is rotated. Is further rotated in the winding direction.

As shown in FIG. 4 and the like, when the first teeth 34 and the second teeth 40 of the rotating member 28 pierce the moving member main body 66, the shapes of the first teeth 34 and the second teeth 40 are provided on the moving member main body 66. A groove 66A corresponding to the groove 66A is formed, and on the base end side of the moving member main body 66 in the axial direction with respect to the groove 66A, the bulging portion 66B in which the moving member main body 66 bulges and deforms toward the opening direction of the groove 66A 66 is formed.

On the other hand, as shown in FIG. 1 and FIG. 2, the cover plate 50 is provided with a side wall 72 which constitutes a guide means. The side wall 72 is provided along the outer periphery of the bottom plate 52 of the cover plate 50, and the rotating member 28 is disposed inside the side wall 72, as shown in FIG. The side wall 72 includes a lower wall 74, an outer wall 76, an upper wall outer portion 78, and an upper wall inner portion 80.

The lower wall portion 74 is a vehicle lower side portion of the side wall 72, and the lower wall portion 74 is concavely curved inward in the vehicle width direction and lower side in the vehicle width direction inner portion and goes outward in the vehicle width direction Accordingly, it is gradually separated from the central axis of the rotating member 28 and disposed substantially vertically in the vehicle vertical direction at the outer portion in the vehicle width direction. The outer wall 76 is an outer portion of the side wall 72 in the vehicle width direction, and the outer wall 76 is disposed vertically to the vehicle width direction and is disposed up to the upper side of the rotating member 28. The upper wall outer side portion 78 is a portion on the vehicle upper side and the vehicle width direction outer side of the side wall 72, and the upper wall outer portion 78 is curved at the boundary portion with the outer wall portion 76 It is inclined to the upper side of the vehicle. The upper inner wall portion 80 is a portion on the vehicle upper side and the inner width direction of the side wall 72, and the upper inner wall portion 80 is inclined to the lower side of the vehicle with respect to the inner width direction. It is concavely curved on the upper side of the vehicle.

Further, as shown in FIG. 2, inside the cover plate 50, a guide member 82 which constitutes a guide means together with the side wall 72 is provided. The guide member 82 includes a base portion 84. The base portion 84 is opposed to the leg plate 12A on the vehicle front side of the leg plate 12A of the frame 12. Therefore, the distance between the base portion 84 and the bottom plate 52 of the cover plate 50 along the longitudinal direction of the vehicle is smaller than the distance between the leg plate 12A and the bottom plate 52 of the cover plate 50. On the vehicle front side of the base portion 84, a substantially triangular prism-shaped first guide portion 86, a substantially triangular prism-shaped second guide portion 88 as a limiting portion, and a substantially rectangular-pillar-shaped third guide portion 90 are provided.

The first guide 86 is disposed inside the boundary between the lower wall 74 and the outer wall 76 of the side wall 72, and the surface of the first guide 86 on the rotating member 28 side is the outer side in the vehicle width direction. The vehicle width direction inner end and the vehicle upper end are continuous with the upper surface of the lower wall 74 and the inner surface of the outer wall 76 in the vehicle width direction. The second guide portion 88 is disposed on the vehicle upper side of the vehicle width direction outer portion of the rotating member 28, and is provided on the vehicle width direction inner side of the boundary portion between the outer wall 76 and the upper wall outer portion 78 of the side wall 72. The lower end portion of the second guide portion 88 is disposed on the lower side of the vehicle at the boundary between the upper wall outer side portion 78 and the upper wall inner side portion 80. It is inserted between the opposing plate 30A and the second opposing plate 36A of the second rotating portion 36, and is separated from the first opposing plate 30A and the second opposing plate 36A (see FIG. 9). The outer surface of the second guide portion 88 in the vehicle width direction is a reduced surface 88A, and the reduced surface 88A is inclined inward in the vehicle width direction as it goes to the upper side of the vehicle, and convex outward in the vehicle width direction It is curved in the shape of a circle. The vehicle upper end surface of the second guide portion 88 is curved in a convex shape, and the inner surface in the vehicle width direction of the second guide portion 88 is a flat surface inclined inward in the vehicle width direction toward the lower side of the vehicle It has been The third guide portion 90 is disposed on the inner side in the vehicle width direction of the upper wall inner portion 80 of the side wall 72 and on the lower side of the vehicle, and the outer surface in the vehicle width direction of the third guide portion 90 is the vehicle of the upper wall inner portion 80 The lower surface is a flat surface continuous with the outer end in the vehicle width direction, and is opposed to the inner surface in the vehicle width direction of the second guide portion 88.

The vehicle width direction inner portion of the lower wall portion 74 in the side wall 72 forms the outer surface of the change passage 32, and the change passage 32 is formed between the leg plate 12A of the frame 12 and the bottom plate 52 of the cover plate 50. ing. Outer portion in the vehicle width direction of the lower wall portion 74 in the side wall 72, the outer wall portion 76, the upper wall outer portion 78, the upper wall inner portion 80 and the first guide portion 86 of the guide member 82, the second guide portion 88, the third guide The portion 90 forms a guide path 38 as a moving path, and the guide path 38 is formed between the bottom plate 52 of the cover plate 50 and the base portion 84 of the guide member 82.

The lower portion of the guide path 38 is a reverse path 38A, and the outer surface of the reverse path 38A is an outer portion in the vehicle width direction of the lower wall portion 74 (except for the portion where the first guide portion 86 is disposed), the first The lower portion of the vehicle (excluding the portion where the first guide portion 86 is disposed) of the first guide portion 86 and the outer wall portion 76 is formed, and gradually separated from the central axis of the rotating member 28 as it goes outward in the vehicle width direction There is. A portion on the vehicle upper side and the vehicle width direction outer side of the guide path 38 is a straight path 38B as a limit path, and an outer side surface of the straight path 38B is a vehicle upper portion and an upper wall outer portion 78 of the outer wall 76 While forming, the reduction | decrease surface 88A (vehicle lateral direction outer side surface) of the 2nd guide part 88 forms the inner surface of the straight path 38B. A portion on the vehicle upper side and in the vehicle width direction of the guide path 38 is a return path 38C, and the outer surface of the return path 38C is formed by the upper wall inner portion 80 and the third guide portion 90, and the return path 38C. The upper surface of the second guide portion 88 and the inner surface in the vehicle width direction are formed on the inner surface of the second guide portion 88.

As described above, with the first teeth 34 and the second teeth 40 of the rotating member 28 sticking into the moving member main body 66 of the moving member 64, the conical portion 70 of the moving member 64 is closer than the central axis of the rotating member 28. When the vehicle is moved downward, the conical portion 70 is moved along the change passage 32, the reverse passage 38A of the guide passage 38, the straight passage 38B and the turnaround passage 38C (see FIGS. 4 to 9). When the conical portion 70 is moved along the straight path 38B, the conical portion 70 is guided (slided) by the reduced surface 88A of the straight path 38B (the outer surface of the second guide portion 88 in the vehicle width direction) Be moved. The angle of inclination of the reducing surface 88A to the upper side of the vehicle with respect to the upper side of the vehicle is such that the conical portion 70 does not stop moving to the upper side of the vehicle due to the friction with the reducing surface 88A. Furthermore, when the conical portion 70 is guided by the reduced surface 88A, the vehicle width direction dimension at the bulging portion 66B position of the moving member main body 66 is smaller than the vehicle width direction dimension at the reduced surface 88A position of the straight path 38B. As a result, the bulging portion 66B is limited to slide on the reducing surface 88A.

Further, as shown in FIG. 2, between the second guide portion 88 and the third guide portion 90 of the guide member 82 (a lower portion of the turning path 38C), a stopper 92 constituting a stopping means is provided. It is done. The stopper 92 is formed in a rod shape by a synthetic resin material harder than the moving member 64. The longitudinal direction (the direction of the arrow C in FIG. 2 and the like) of the stopper 92 is inclined to the vehicle lower side with respect to the inside in the vehicle width direction, and the stopper 92 is a second guide portion 88 and a third guide portion 90 of the guide member 82. And can be moved in the longitudinal direction of the stopper 92.

Furthermore, a pair of concave portions 94 are formed in the longitudinal direction proximal end portion of the stopper 92 (the end portion on the side opposite to the arrow C of the stopper 92 in the direction opposite to the arrow C). The recess 94 is opened at the outer peripheral surface of the stopper 92. The pair of recesses 96 respectively contain a pair of ribs 96. One of the ribs 96 is projected from the second guide portion 88 of the guide member 82 in a direction inclined to the upper side of the vehicle with respect to the inner side in the vehicle width direction. The other rib 96 is projected from the third guide portion 90 of the guide member 82 in a direction inclined to the vehicle lower side with respect to the outer side in the vehicle width direction. The stoppers 92 are held by the second guide portion 88 and the third guide portion 90 of the guide member 82 by having the ribs 96 in the pair of recesses 94, as shown in FIGS. 7 and 8. The sheared portion 96 can move the stopper 92 in the longitudinal direction.

Furthermore, as shown in FIG. 2, a tapered portion 98 is formed at the longitudinal direction front end (the end of the stopper 92 in the direction of arrow C in FIG. 2 etc.) of the stopper 92. It is tapered when viewed from the front side. An inner portion of the tapered portion 98 in the vehicle width direction of the distal end 98A of the stopper 92 at the tapered portion 98 is an inner portion 98B, and a longitudinal proximal end of the stopper 92 at the inner portion 98B is an inner proximal end 98C. It is assumed. The inner portion 98B is inclined outward in the vehicle width direction with respect to the axial direction of the movable member 64 between the axial tip end of the cylinder 58 and the vehicle lower side portion of the side wall 72 of the cover plate 50, and the stopper 92 is long. The inner proximal end 98C of the tapered portion 98 is moved to the moving member 64 earlier than the distal end 98A of the tapered portion 98 is abutted against the moving member 64 when moved to the distal end side (arrow C direction side in FIG. 2 etc.). It is abutted.

On the other hand, the vehicle width direction outer portion of the tapered portion 98 with respect to the tip 98A of the tapered portion 98 is an outer portion 98D, and the longitudinal proximal end of the stopper 92 in the outer portion 98D is an outer proximal end 98E. . The outer side portion 98D is inclined inward in the vehicle width direction with respect to the longitudinal direction distal end side of the stopper 92. Therefore, with the inner proximal end 98C of the tapered portion 98 abutted against the moving member 64, the outer proximal end 98E of the tapered portion 98 is within the rotation trajectory of the first teeth 34 and the second teeth 40 of the rotating member 28. I can't get into Furthermore, when the stopper 92 is moved to the longitudinal tip end side so that the outer proximal end 98E of the tapered portion 98 enters the rotation trajectory of the first teeth 34 and the second teeth 40 of the rotating member 28, The formation positions of the inner proximal end 98C and the outer proximal end 98E of the tapered portion 98 are set such that the inner proximal end 98C abuts on the moving member 64.

By the way, as shown in FIGS. 5 to 8, the seal ball 62 and the moving member 64 are compressed and deformed in the axial direction of the cylinder 58 by the pressure of the gas supplied from the MGG 60. Here, as shown in FIG. 8, in a state where the tapered portion 98 of the stopper 92 is engaged to the central axis side of the moving member 64 at the axially proximal end portion of the moving member main body 66 of the moving member 64, The axial length of the moving member 64 including the conical portion 70 and the small diameter portion 68 and the pressure of the gas supplied from the MGG 60 are set such that the axial proximal end of the moving member 64 is disposed inside the cylinder 58 There is.

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

In the webbing retractor 10, when the MGG 60 of the pretensioner 26 is operated by the ECU at the time of a vehicle collision, which is one aspect of a vehicle emergency, high-pressure gas is instantaneously supplied from the MGG 60 to the inside of the cylinder 58. When the seal ball 62 is moved to the axial tip end side of the cylinder 58 by the pressure of the gas, the moving member 64 is pressed by the seal ball 62 and moved to the axial tip end side.

As the moving member 64 is moved to the axial tip end side, the conical portion 70 of the moving member 64 collides with one of the first teeth 34 and the second teeth 40 of the rotating member 28 and the small diameter portion of the moving member 64 68 is collided with the other of the first teeth 34 and the second teeth 40 (see FIG. 3). Thereby, when one of the first teeth 34 and the second teeth 40 of the rotating member 28 is pressed downward by the conical portion 70 of the moving member 64, the rotating member 28 takes up the winding direction (arrow A in FIG. 4 etc. Direction) is rotated.

Furthermore, the first teeth 34 and the second teeth 40 on the pull-out direction side (the arrow B direction side in FIG. 2 etc.) than one of the first teeth 34 and the second teeth 40 pressed by the conical portion 70 of the moving member 64 As shown in FIG. 4, when the rotating member 28 rotates in the winding direction, the moving member main body 66 of the moving member 64 is pierced from the outer peripheral surface of the moving member 64 toward the center in the radial direction.

As described above, the portion of the moving member 64 in which the first teeth 34 and the second teeth 40 are pierced is moved to the lower side of the vehicle, whereby the rotating member 28 is further taken up in the winding direction (arrow A direction in FIG. 4 etc.) To be rotated. The rotation of the rotating member 28 in the winding direction is transmitted to the spool 18 via the torsion bar 24, and the spool 18 is rotated in the winding direction. As a result, the webbing 20 is wound around the spool 18 and the restraint of the occupant by the webbing 20 is increased.

With the first teeth 34 and the second teeth 40 of the rotating member 28 stuck in the moving member main body 66 of the moving member 64, the conical portion 70 of the moving member 64 moves toward the vehicle lower side than the central axis of the rotating member 28 Then, the conical portion 70 is moved (sliding) to the outer side of the vehicle while being guided (slided) by the outer surface of the change passage 32 (the inner portion of the lower wall portion 74 of the cover plate 50). The moving member 64 is curved in the axial direction in the change passage 32. Furthermore, the conical portion 70 is the outer surface of the reverse passage 38A of the guide passage 38 (the vehicle width direction outer portion of the lower wall 74, the first guide 86 of the guide member 82, and the vehicle lower side of the outer wall 76 of the cover plate 50). Part) is moved to the outer side in the vehicle width direction and the upper side of the vehicle, and the moving member 64 is moved from the moving member main body 66 at the boundary position between the change passage 32 and the reverse passage 38A. As the teeth 40 are withdrawn, the moving member 64 is reduced in axial curvature of curvature in the reversing path 38A.

Next, the conical portion 70 is moved to the upper side of the vehicle while the moving member 64 is left bent in the axial direction in the reversing path 38A, whereby the conical portion 70 is a straight path of the guide path 38. The conical portion 70 is always spaced from the outer surface of the 38B (the vehicle upper and outer portions 78 of the outer wall 76 of the cover plate 50), and the conical portion 70 is a reduced surface 88A of the straight path 38B (the second guide of the guide member 82). The moving member 64 is moved (substantially straight) while being guided (slided) to the vehicle lateral direction outer surface of the portion 88, and the moving member 64 is reduced in the curvature of curvature in the axial direction in the straight passage 38B (FIG. 4 and FIG. See Figure 9). Furthermore, the conical portion 70 passes through the straight path 38B and abuts on the inner end in the vehicle width direction of the outer surface (the upper wall inner portion 80 of the cover plate 50) of the return path 38C of the guide path 38 (see FIG. 5) ).

In this state, when the moving member 64 is further pressed by the seal ball 62, the conical portion 70 is guided (slided) to the outer side surface of the return path 38C and inclined downward to the vehicle width direction inside. Moved to. As a result, as shown in FIG. 6, the moving member main body 66 of the moving member 64 is brought into contact with a portion other than the vehicle upper end of the outer surface of the rectilinear path 38B, and the axial direction tip end of the moving member main body 66 is The conical portion 70 is abutted to the proximal end in the longitudinal direction of the stopper 92 in contact with the vehicle upper end surface (the vehicle upper end surface of the second guide portion 88) of the inner side surface of the turnaround path 38C.

Then, from this state, the moving member 64 is further pressed by the seal ball 62, and the pressing force applied from the conical portion 70 of the moving member 64 to the longitudinal proximal end of the stopper 92 is the second guide portion 88 of the guide member 82 and the If the shear strength of the ribs 96 of the three guide portions 90 is greater than that of the ribs 96, the ribs 96 are sheared. Thereby, as shown in FIG. 7, the stopper 92 is configured by the pressing force from the conical portion 70 on the vehicle lower side portion of the return path 38C (the inner side surface of the second guide portion 88 in the vehicle width direction and the third guide portion 90 The vehicle is guided to the outer side surface in the vehicle width direction and moved to the lower side of the vehicle and in the vehicle width direction.

Thus, when the stopper 92 is moved, the moving member main body 66 of the moving member 64 on the most pulling direction side (arrow B direction side in FIG. 7) of the first teeth 34 and the second teeth 40 of the rotating member 28. The inner proximal end 98C of the tapered portion 98 of the stopper 92 abuts on the moving member main body 66 of the moving member 64 on the vehicle upper side than the first teeth 34 or the second teeth 40 in contact with the second teeth 34.

Furthermore, in this state, the rotating member 28 is rotated in the winding direction (the direction of the arrow A in FIG. 7 etc.), and the portion of the moving member 64 that comes out from the tip of the cylinder 58 in the axial direction is moved downward . Therefore, the stopper 92 pressing the moving member 64 is the first tooth 34 and the first tooth 34 of the rotating member 28 by at least one of the rotation of the rotating member 28 in the winding direction and the movement of the moving member 64 downward. The two teeth 40 and the moving member 64 are moved to the engagement side (see FIG. 8).

Thus, the tapered portion 98 of the stopper 92 projects to the moving member main body 66 by the stopper 92 being moved to the engagement portion side of the first tooth 34 and the second tooth 40 of the rotating member 28 and the moving member 64. It is engaged with the moving member main body 66 so as to bite or bite, and further, the rotation of the rotating member 28 in the winding direction and the movement of the moving member 64 to the lower side of the vehicle (the movement of the moving member 64 toward the axial tip end) ) Is limited. As a result, the movement of the moving member 64 toward the axial tip end side is restricted in the axially proximal end portion of the moving member main body 66 with respect to the portion where the tapered portion 98 of the stopper 92 is engaged. Movement to the axial tip end side in the entire axial direction is stopped.

Here, as shown in FIG. 8, when the movement of the moving member 64 to the axial direction distal end side is stopped, the moving member 64 (moving member main body 66) moves to the axial direction distal end side by the seal ball 62. Contact with the outer side surface of the straight path 38B and the outer side surface of the return path 38C, and the lower end in the axial direction at the vehicle width direction outer end (vehicle upper end) of the outer side surface of the return path 38C. It is turned back. Furthermore, the moving member 64 is arranged such that the curvature of the moving member 64 in the axial direction of the turning portion is the entire axial direction of the moving member 64 (in particular, the guide path 38 (the reversing path 38A, the straight path 38B and the turning path 38C) Range) is maximized. For this reason, the movement of the axial leading end side portion of the moving member 64 to the axial tip end side can be effectively limited, and the movement of the moving member 64 to the axial tip end side can be effectively stopped. The axial proximal end of the member 64 can be effectively restricted from being discharged from the axial distal end side of the cylinder 58.

Further, as shown in FIGS. 4 and 9, when the conical portion 70 of the moving member 64 is moved to the upper side of the vehicle in the straight passage 38B, the outer surface and the reduced surface 88A (inner surface) of the straight passage 38B. An increase in the axial curvature of the axially distal end portion of the moving member 64 due to the contact of the conical portion 70 is limited. Therefore, before the conical portion 70 abuts on the outer end of the outer surface of the return path 38C in the vehicle width direction, the movement of the moving member 64 toward the tip end in the axial direction can be suppressed from being restricted. It can suppress that the rotational force in the winding direction of the rotation member 28 and the spool 18 is reduced, and can suppress that the winding force of the webbing 20 to the spool 18 is reduced.

Furthermore, as shown in FIG. 4 and FIG. 9, when the conical portion 70 is slid to the reduced surface 88A of the straight path 38B and moved upward, the reduced surface 88A causes the axial tip of the moving member 64 to move. The curvature in the axial direction of the side parts is reduced. Therefore, it is possible to effectively suppress the movement of the moving member 64 to the tip end side in the axial direction before the conical portion 70 abuts on the outer end of the outer surface of the return path 38C in the vehicle width direction.

Moreover, as shown in FIG. 4 and FIG. 9, when the conical portion 70 is slid on the reduced surface 88A of the straight path 38B and moved upward, the bulging portion 66B of the moving member 64 is reduced. Sliding to 88A is limited. Therefore, it is possible to effectively suppress the movement of the moving member 64 to the tip end side in the axial direction before the conical portion 70 abuts on the outer end of the outer surface of the return path 38C in the vehicle width direction.

Further, as shown in FIG. 9, the lower end portion of the second guide portion 88 is inserted between the first opposing plate 30A and the second opposing plate 36A of the rotating member 28, and the conical portion 70 is When moving the straight path 38B to the upper side of the vehicle, the lower end portion of the second guide portion 88 is between the first opposing plate 30A of the conical portion 70 and the second opposing plate 36A (rotation member 28 side) Restrict travel to Therefore, it is possible to effectively suppress the movement of the moving member 64 to the tip end side in the axial direction before the conical portion 70 abuts on the outer end of the outer surface of the return path 38C in the vehicle width direction.

The disclosure of Japanese Patent Application 2017-150958, filed on August 3, 2017, is incorporated herein by reference in its entirety.

10 webbing take-up device 18 spool 20 webbing 28 rotating member 38 guide path (moving path)
38B Straight path (limit road)
38C return path 64 moving member 66B bulging portion 88 second guide portion (restriction portion)
88A Decreasing surface 92 Stopper (stopping means)

Claims

A spool on which the webbing of the seat belt device is wound by being rotated in the winding direction;
A rotating member rotated to one side to rotate the spool in the winding direction;
A moving member for rotating the rotating member to one side by being moved in the axial direction and engaged with the rotating member;
A moving path which is moved in one direction after the moving member rotates the rotating member to one side;
Stopping means provided on one side of the moving path for stopping movement of the moving member;
The moving member is provided on the moving path in the other direction side of the stopping means, and when the stopping means stops moving the moving member, the moving member is turned in the axial direction and an axis at the turning portion of the moving member A turnaround path where the curvature in direction is maximized in the area of the moving member located in the movement path;
A webbing retractor comprising:
The travel path is provided on the other side of the turnback path, and is provided with a limit path that limits the increase in the curvature of the travel member in the axial direction due to the contact of the one end of the travel member to the side surface. The webbing winding device according to 1.
3. The webbing take-up device according to claim 2, further comprising a reduction surface provided on a side surface of the restriction path, the one-direction end of the moving member being in contact to reduce the curvature in the axial direction of the moving member.
The bulging portion is provided on the moving member by engaging the moving member with the rotating member, and the one side end of the moving member is brought into contact with the reduction surface. The webbing take-up device according to claim 3, wherein the contact with the reducing surface is limited.
The restriction | limiting part which is provided in the said movement path in the other direction side of the said return path, and restrict | limits the movement to the said rotation member side of the one-way side edge part of the said movement member is provided. The webbing take-up device according to the item.
The webbing retractor according to any one of claims 1 to 5, wherein when the stopping means stops the movement of the moving member, the curvature in the axial direction of the turning portion of the moving member is increased.
The webbing retractor according to any one of claims 1 to 6, wherein the curvature of the moving member in the axial direction is reduced at the other side end of the moving path.
The webbing retractor according to any one of claims 1 to 7, wherein the moving path is disposed around the rotating member.