JP2020192886A - Webbing winding apparatus - Google Patents

Abstract

To provide a webbing winding apparatus that makes it easy to keep volume balance in an axial direction of a spool.SOLUTION: A webbing winding apparatus 10 includes: a spool 14; a V gear 24 to regulate rotation in a pull-out direction of the spool 14 by regulation of the rotation in the pull-out direction; a reduction gear group 50 which is disposed on the other side in an axial direction with respect to the spool 14, and which is designed to decelerate and transmit the rotation in the pull-out direction of the spool 14; a bridging shaft 61 to transmit the rotation transmitted by the reduction gear group 50 to the spool 14 to one side from the other side in the axial direction; a cam 62 rotated by the rotation transmitted by the bridging shaft 61; and a pawl 70 which is displaced up to a lock position by rotation of the cam 62 up to a non-engaging position so as to regulate the rotation in the pull-out direction of the V gear 24 by the displacement up to the lock position.SELECTED DRAWING: Figure 9

Description

The present invention relates to a webbing winder in which a webbing mounted on an occupant is wound.

Patent Document 1 discloses a webbing winding device having an ALR (Automatic Locking Retractor) mechanism. This ALR mechanism can operate between the fully pulled state where the webbing is most pulled out and the empty latch state where the tongue provided on the webbing is attached to the buckle when the occupant is not seated on the seat. is there. This ALR mechanism includes a reduction gear group that decelerates and transmits the rotation of the spool, a cam (control disc) that is rotated by the gear group, and an ALR pawl (switching pawl) that is operated by the cam. It is configured. By switching the engagement state between the ALR pawl and the V gear, the operation and non-operation of the ALR mechanism are switched.

Japanese Unexamined Patent Publication No. 2014-141137

By the way, in the webbing winding device described in Patent Document 1, both the V gear and the gear group are arranged on one side of the spool in the axial direction and one side of the other side.

An object of the present invention is to provide a webbing winding device that can easily balance the volume in the spool axial direction.

In the webbing winding device according to the first aspect, the webbing attached to the occupant is wound, and the spool is rotated in the pulling direction by pulling out the webbing, and the rotation in the pulling direction is restricted. A V gear in which rotation in the pull-out direction of the spool is restricted, a reduction gear group arranged on the other side in the axial direction with respect to the spool to decelerate and transmit rotation in the pull-out direction of the spool, and a reduction gear group. A bridging shaft that transmits the rotation transmitted by the above spool from the other side in the axial direction to one side, a cam that is rotated by the rotation transmitted by the bridging shaft, and the cam that rotates to a non-engaged position. This is a webbing take-up device including a poul that is displaced to the lock position and the rotation of the V gear in the pull-out direction is restricted by the displacement to the lock position.

In the first aspect of the webbing winding device according to the second aspect, the bridging shaft is pivotally supported on both one side and the other side in the axial direction with respect to the spool.

In the first or second aspect, the webbing take-up device according to the third aspect is arranged inside the V gear, and is displaced to the lock position to regulate the rotation of the V gear in the pull-out direction. It includes a lock member including a magnet, and a coil that is arranged on one side in the axial direction with respect to the V gear and that acts on the magnet to displace the lock member to a lock position.

In the webbing winding device according to the fourth aspect, in any one of the first to third aspects, the bridging shaft and the cam are arranged coaxially.

In the first aspect, when the spool is rotated in the pull-out direction by pulling out the webbing, the rotation of the spool in the pull-out direction is decelerated by the reduction gear group arranged on the other side in the axial direction with respect to the spool. Be transmitted. The rotation transmitted by the reduction gear group is transmitted from the other side in the axial direction to one side with respect to the spool by the bridging shaft. Then, the cam rotates due to the rotation transmitted by the bridging shaft. When the cam rotates to the non-engaged position, the pole is displaced to the locked position, and when the poll is displaced to the locked position, the rotation of the V gear in the pull-out direction is restricted. As a result, the rotation of the spool in the pull-out direction is restricted.
As described above, in this aspect, of the V gear and the reduction gear group, the V gear is arranged on one side in the axial direction with respect to the spool, and the reduction gear group is arranged on the other side in the axial direction with respect to the spool. Therefore, as compared with the embodiment in which both the V gear and the gear group are arranged on one side in the axial direction with respect to the spool, it becomes easy to provide a winding device having a volume balance in the axial direction.

In the second aspect, since the bridging shaft is pivotally supported on both one side and the other side in the axial direction with respect to the spool, the bridging shaft is stably supported.

In a third aspect, the webbing winder comprises a locking member. By displacing the lock member to the lock position, the rotation of the V gear in the pull-out direction is restricted. The webbing take-up device also includes a coil. The coil allows the lock member to be displaced to the lock position. Therefore, a mechanism that limits the withdrawal of the webbing from the spool can be electrically actuated.
Further, the reduction gear group is arranged on the other side in the axial direction with respect to the spool, and the coil is arranged on one side in the axial direction with respect to the V gear. Therefore, the reduction gear group is not located between the coil and the lock member. For this reason, it becomes easier to reduce the axial distance between the coil and the lock member as compared with the mode in which the gear group is arranged between the coil and the lock member. As the axial distance between the coil and the lock member becomes shorter, the operating efficiency of the electromagnetic actuator improves.

In the fourth aspect, since the bridging shaft and the cam are arranged coaxially, the bridging shaft can be easily arranged near the spool, and the webbing winding device can be prevented from becoming large in size.

It is an exploded perspective view which shows the webbing winding apparatus of embodiment disassembled, and is the view which saw from the lock mechanism side (one side in the axial direction) (however, ALR mechanism is not shown). It is an exploded perspective view which shows the webbing winding apparatus of embodiment disassembled, and is the figure which was seen from the side opposite to the lock mechanism (the other side in the axial direction) (however, the ALR mechanism is not shown). It is a top view which shows the lock mechanism, and is the figure which shows the state which the small Paul limits the displacement of the W Paul. It is a top view which shows the lock mechanism, and is the figure which shows the state which the small Paul engaged with the sensor holder. It is a top view which shows the lock mechanism, and is the figure which shows the state which the small Paul is arranged in a neutral position. It is an exploded perspective view which shows the ALR mechanism of an embodiment by being disassembled. It is the schematic seen from the axial direction which shows the relationship of V gear, ALR Paul and cam in the state which ALR mechanism is not operating. It is the schematic seen from the axial direction which shows the relationship of V gear, ALR Paul and cam in the state which ALR mechanism is operating. It is a figure which shows typically the arrangement relation of the spool, the reduction gear, the bridging cam, the V gear, the magnet, and the coil in the webbing winding apparatus of embodiment.

Hereinafter, the webbing winding device 10 according to the embodiment of the present invention will be described.

The webbing winding device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 9.

As shown in FIGS. 1 and 2, the webbing winding device 10 of the present embodiment includes a frame 12, a spool 14, a webbing 16, and a locking mechanism 18. In the following, when simply indicating the axial direction, the radial direction, and the circumferential direction, the rotation axis direction, the rotation radial direction, and the rotation circumferential direction of the spool 14 are indicated unless otherwise specified.

The frame 12 includes a plate-shaped back plate 12A fixed to the vehicle body. Further, leg pieces 12B and 12C extend at substantially right angles from both ends in the width direction (axial direction) of the back plate 12A. A lock mechanism 18, which will be described later, is provided on the leg piece 12B side. Further, the leg piece 12B is formed with an opening 12D in which the lock base 20 and the main lock 22 (see FIG. 3), which will be described later, are arranged in the inner peripheral portion. A plurality of lock teeth 12E with which the main lock 22 is engaged are formed along the circumferential direction on the inner edge of the opening 12D. Further, on the leg piece 12C side, a winding attachment urging mechanism (not shown) for rotationally urging the spool 14 in the winding direction is provided.

The spool 14 is formed in a substantially cylindrical shape, and is rotatably supported by the frame 12 between the leg pieces 12B and the leg pieces 12C of the frame 12. A known torsion shaft constituting a force limiter mechanism is arranged inside the spool 14. As shown in FIG. 1, a lock base 20 coupled to the spool 14 via a torsion shaft (not shown) is provided at one end of the spool 14 in the axial direction (arrow Z direction side). At the center of the lock base 20 in the radial direction, a V gear support portion 20A on which the V gear 24 described later is supported is erected toward one side in the axial direction.

The webbing 16 is attached to the body of an occupant, and a base end portion, which is one end portion in the longitudinal direction thereof, is locked to the spool 14. The spool 14 is rotationally urged in the winding direction (direction of arrow C in FIG. 1 and the like), which is one of the rotational directions, by the urging force of the spring that constitutes a part of the winding mounting urging device. Then, the spool 14 is rotated in the winding direction so that the webbing 16 is wound on the spool 14 from the proximal end side. Further, by pulling out the webbing 16 from the spool 14, the spool 14 is rotated in the other rotation direction (the side opposite to the arrow C in FIG. 1 and the like).

Next, the lock mechanism 18 will be described.

As shown in FIGS. 1 and 2, the lock mechanism 18 includes a main lock 22 supported by the lock base 20 (see FIG. 3), a V gear 24 rotatably supported by the lock base 20, and a V gear. The W powl 26 as the first poul, the small powl 28 as the second poul, and the coil 30 supported by the 24 are the main elements.

The main lock 22 is formed in a substantially rectangular block shape. The base end side of the main lock 22 is tiltably supported by a main lock support portion provided on the lock base 20. Further, on the radial outer side of the tip side of the main lock 22, a main lock side engaging tooth that engages with the lock tooth 12E of the frame 12 is formed. Since the configuration of the main lock 22 is the same as the known configuration, the description using the figure of the main lock side engaging tooth on the proximal end side and the distal end side of the main lock 22 will be omitted. Then, the main lock 22 is tilted (displaced) radially outward with the main lock support portion as the support portion, so that the main lock side engaging teeth engage with the lock teeth 12E of the frame 12. Further, as shown in FIG. 3, the main lock 22 is provided with a V gear engaging convex portion 22A that projects toward one side in the axial direction.

The V gear 24 is formed in a disk shape. At the center of the V gear 24 in the radial direction, a support hole 24A through which the V gear support portion 20A (see FIG. 1) provided at the center of rotation of the lock base 20 is inserted is formed. By inserting the V gear support portion 20A of the lock base 20 into the support hole 24A, the V gear 24 can rotate with the V gear support portion 20A as the support portion.

Further, a W-powl support portion 24B for supporting the W-powl 26, which will be described later, is erected on the radial outer side of the portion of the V-gear 24 in which the support hole 24A is formed, facing one side in the axial direction. Further, on the radial side of the portion of the V gear 24 where the support hole 24A is formed and on one side in the circumferential direction (arrow C direction side) of the portion where the W Paul 26 supported by the W Paul support portion 24B is arranged. A small Paul support portion 24C that supports the small Paul 28, which will be described later, is erected toward one side in the axial direction. Further, in the V gear 24, the portion of the V gear 24 in which the support hole 24A is formed is radially outward and overlaps in the axial direction with the W powl 26 supported by the W poul support portion 24B and the small powl 28 supported by the small poul support portion 24C. An elongated working groove 24D in which the V-gear engaging convex portion 22A of the main lock 22 is arranged is formed in the portion not provided. The V gear 24 described above is rotationally urged with respect to the lock base 20 by a spring (not shown) provided between the V gear 24 and the lock base 20, and the lock base 20 is urged by the spring. The rotation in the pull-out direction is locked.

Further, a coil spring 32 for urging the W Paul 26 is locked on one side in the circumferential direction (the side in the direction of arrow C) of the W Paul 26. The coil spring 32 is compressed between the W Paul 26 and the coil spring locking portion 24E provided on the V gear 24. Further, at the end of the W powl 26 on one side in the circumferential direction (the side in the direction of arrow C), a small poul contact portion 26B that comes into contact with the small poul 28, which will be described later, is projected toward one side in the circumferential direction.

Further, at the end of the W-powl 26 on the other side in the circumferential direction (opposite to the arrow C direction), a single single engaging tooth 38A formed on the holder 38 (see FIG. 1) to be described later is engaged. The W-powl side engaging tooth 26C is formed. Then, as shown in FIG. 5, the W-powl 26 tilts to one side with the W-powl support portion 24B of the V gear 24 as a support shaft portion against the urging force of the coil spring 32 (the W-powl side engaging tooth 26C side is By tilting so as to be displaced outward in the radial direction), the W-powl side engaging tooth 26C engages with the powl engaging tooth 38A of the holder 38. The position of the W-powl 26 in a state where the tilt of the W-powl 26 is restricted by the urging force of the coil spring 32 is set as the "allowable position", and the W-powl side engaging tooth 26C becomes the paw engaging tooth 38A of the holder 38. The position of the W Paul 26 in the engageable state is defined as the “lock position”. Here, in the present embodiment, when the rotational speed of the spool 14 in the pull-out direction exceeds a predetermined speed, the centrifugal force acting on the W-powl 26 exceeds the urging force of the coil spring 32, so that the W-poul 26 is formed. It is designed to be tilted to one side.

As shown in FIG. 3, the small Paul 28 is formed in an L-shaped (U-shaped) block shape that is smaller than the W Paul 26. A support hole 28A through which the small Paul support portion 24C of the V gear 24 is inserted is formed in the middle portion in the circumferential direction of the small Paul 28. By inserting the small Paul support portion 24C of the V gear 24 into the support hole 28A, the small Paul 28 can be tilted (displaced) with the small Paul support portion 24C as a support shaft portion.

Further, at the end of the small poul 28 on one side in the circumferential direction (the side in the direction of arrow C), one end of the leaf spring 34 as an urging member for urging the small poul 28 toward the neutral position side described later is It is a leaf spring locking portion 28B to be locked. The other end of the leaf spring 34 is locked to the leaf spring locking portion 24F provided on the V gear 24.

Further, on the radial outer side of the end portion of the small powl 28 on the other side in the circumferential direction (opposite to the arrow C direction), a single small powl that engages with the powl engaging tooth 38A formed on the holder 38, which will be described later. Paul side engaging teeth 28C are formed. Then, the small powl 28 tilts to one side (the side opposite to the arrow A) with the small powl support portion 24C of the V gear 24 as a support shaft portion against the urging force of the leaf spring 34 (small powl side engaging tooth). By tilting the 28C side so as to be displaced outward in the radial direction (by being brought into the state shown in FIG. 4), the small powl side engaging tooth 28C engages with the powl engaging tooth 38A of the holder 38. It has become.

Further, a W-poul limiting portion 28D is provided so as to project toward the other side in the circumferential direction on the radial inside of the end portion on the other side in the circumferential direction (opposite side of the arrow C direction) of the small pole 28. Then, as shown in FIG. 3, the small powl 28 is tilted to the other side (arrow A direction side) with the small powl support portion 24C of the V gear 24 as a support shaft portion against the urging force of the leaf spring 34. As a result, the W-powl limiting portion 28D and the small-powl contact portion 26B of the W-powl 26 are arranged close to each other in the circumferential direction. Further, the small poul contact portion 26B of the W poul 26 abuts on the W poul limiting portion 28D, so that the tilt of the W poul 26 from the allowable position to the lock position side is restricted.

It should be noted that the "W-powl limiting position (FIG.)" is set to the position of the small-powl 28 in which the W-powl limiting portion 28D and the small-powl contact portion 26B of the W-powl 26 are arranged close to each other in the circumferential direction. The "lock position (FIG. 4)" is defined as "the position shown in 3", and the position of the small paw 28 in a state where the small powl side engaging tooth 28C can engage with the paw engaging tooth 38A of the holder 38 is set as the second position. The position shown in) ”. Further, the position of the small Paul 28 in a state where the tilt of the small Paul 28 is restricted only by the urging force of the leaf spring 34 from between the W Paul limiting position and the lock position is defined as the “neutral position (shown in FIG. 5). Position) ”. As shown in FIG. 5, when the small poul 28 is arranged in the neutral position, the small poul side engaging tooth 28C does not engage with the powl engaging tooth 38A of the holder 38, and the W poul The small powl contact portion 26B of 26 does not abut on the W poul limiting portion 28D.

Further, a magnet 36 is fixed (included as an example) on one side (in the direction of arrow C) of the small Paul 28 in the circumferential direction. The south and north poles of the magnet 36 are oriented in the axial direction.

As shown in FIGS. 1 and 2, a coil 30 is provided on one side of the small Paul 28 in the axial direction. The coil 30 is formed by being wound around the rotation axis of the spool 14 in the circumferential direction. Most of the coil 30 is arranged in the coil accommodating body 40 formed in a disk shape using a resin material. Then, the coil 30 is energized from the end of a coil 30 (not shown) extending from the coil accommodating body 40. Further, a part of the coil 30 in the circumferential direction is one side of the small Paul 28 in the circumferential direction (arrow C direction side).
(Part where the magnet 36 is fixed) and the portion (the portion where the magnet 36 is fixed) are arranged adjacent to each other in the axial direction. Then, when the coil 30 is energized in one direction, the small pawl 28 is tilted to the W-powl limiting position, and when the coil 30 is energized in the other direction, the small pawl 28 is moved to the locked position. It is designed to be tilted.

The V-gear 24, W-poul 26, small-powl 28, coil 30, and the like described above are arranged in the holder 38 attached to the leg piece 12B of the frame 12. Then, in a state where the holder 38 is attached to the leg piece 12B of the frame 12, the W poul 26 and the small poul 28 and the poul engaging tooth 38A as the engaged portion of the holder 38 are arranged so as to face each other in the radial direction. It has become so.

Next, the ALR mechanism 19 will be described with reference to FIGS. 6 to 8.

As shown in FIG. 6, the ALR mechanism 19 is composed of a reduction gear group 50, a bridging cam 60, and an ALR Paul 70 as main elements. Note that FIG. 6 is a schematic view mainly for explaining the arrangement relationship between the reduction gear group 50 and the bridging cam 60 in the ALR mechanism 19 of the present embodiment. Therefore, the structure is slightly different from that of the webbing winding device 10 shown in FIGS. 1 and 2.

The reduction gear group 50 is arranged on the other side in the axial direction (opposite side in the Z direction) with respect to the spool 14. Specifically, the reduction gear group 50 is arranged on the opposite side in the axial direction with respect to the leg piece 12B of the frame 12. The reduction gear group 50 is a gear group that functions to decelerate and transmit the rotation of the spool 14, from the first gear 51, the second gear 52, the third gear 53, and the fourth gear 54. It is configured.

The first gear 51 is attached to a rotating shaft 12F (see FIG. 2) projecting from the spool 14 on the other side in the axial direction, and rotates in conjunction with the rotation of the spool 14.

The large gear 52A of the second gear 52, which is a two-stage gear, meshes with the first gear 51. A small gear 52B of the second gear 52 is formed on the other side of the large gear 52A of the second gear 52 in the axial direction. The large gear 52A and the small gear 52B of the second gear 52 integrally rotate around the axis of the second gear 52.

The small gear 52B of the second gear 52 is meshed with the large gear 53A of the third gear 53, which is a two-stage gear. A small gear 53B of the third gear 53 is formed on one side of the large gear 53A of the third gear 53 in the axial direction. The large gear 53A and the small gear 53B of the third gear 53 rotate integrally around the axis of the third gear 53.

The fourth gear 54 meshes with the small gear 53B of the third gear 53. The fourth gear 54 is attached to the end of the bridging cam 60 on the other side in the axial direction of the bridging shaft 61, and the bridging cam 60 rotates in conjunction with the rotation of the fourth gear 54.

The bridging cam 60 has a bridging shaft 61 and a cam 62. The cam 62 is provided on one side of the bridging shaft 61 in the axial direction, and rotates in conjunction with the bridging shaft 61.

The bridging shaft 61 is arranged with the axial direction as the longitudinal direction. The other side in the axial direction of the bridging shaft 61 is rotatably supported by the leg piece 12B on the other side in the axial direction of the frame 12, and the one side in the axial direction of the bridging shaft 61 is the leg piece on one side in the axial direction of the frame 12. It is rotatably supported by 12B. The cam 62 is arranged on one side in the axial direction with respect to the leg piece 12B on one side in the axial direction of the frame 12.
The webbing winding device 10 of the present embodiment includes a known selectable force limiter mechanism (SFL mechanism, not shown), and the bridging cam 60 utilizes the space between the spool 14 and the SFL mechanism. Be placed.

The rotation shafts of the first gear 51, the second gear 52, the third gear 53, and the fourth gear 54 constituting the reduction gear group 50 are all parallel to the shaft of the spool 14. Although not shown, the rotation shafts of the first gear 51, the second gear 52, the third gear 53, and the fourth gear 54 constituting the reduction gear group 50 are straightened in this order when viewed from the axial direction of the spool 14. It is arranged on the line. The bridging cam 60 is located on the lower side of the spool 14 in the vertical direction of the vehicle.

The ALR Paul 70 is formed in a longitudinal shape when viewed from the axial direction. An ALR support portion 71, which is a tilt center of the ALR poul 70, is formed in the middle portion of the ALR powl 70 in the longitudinal direction. Since the ALR powl support portion 71 of the ALR powl 70 is rotatably supported by the leg piece 12B of the frame 12, the ALR powl 70 can be tilted with the ALR powl support portion 71 as a shaft support.

A V-gear side engaging tooth 73 that engages with the external tooth 24S of the V-gear 24 is formed on one side (left side in FIG. 7) of the ALR powl 70 in the longitudinal direction. When the ALR powl 70 is displaced to the locked position (position shown in FIG. 8), the V gear side engaging tooth 73 of the ALR powl 70 engages with the external tooth 24S of the V gear 24, and the V gear 24 is drawn out. Rotation is regulated.

A spring 75 is locked on one side of the ALR Paul 70 in the longitudinal direction. The ALR Paul 70 is urged by the spring 75 around the ALR Paul support portion 71 on one side in the rotational direction (clockwise in FIG. 7). Therefore, the ALR Paul 70 is urged toward the lock position side by the urging force of the spring 75.

A cam-side engaging portion 72 that engages with the cam 62 is formed on the other side (right side in FIG. 7) of the ALR Paul 70 in the longitudinal direction. In a normal state (when the webbing 16 is not completely pulled out), as shown in FIG. 7, the cam-side engaging portion 72 of the ALR Paul 70 is engaged with the large-diameter portion 62A of the cam 62. In a state where the cam-side engaging portion 72 of the ALR powl 70 is engaged with the large-diameter portion 62A of the cam 62, the V-gear-side engaging tooth 73 of the ALR powl 70 engages with the external tooth 24S of the V-gear 24. It is located in a position that does not. That is, when the cam-side engaging portion 72 of the ALR Paul 70 engages with the large-diameter portion 62A of the cam 62, the ALR Paul 70 is prevented from being displaced to the locked position, and the ALR Paul 70 is in the allowable position (FIG. 7). It is held in the position shown in).

When the webbing 16 is pulled out, the rotational force is transmitted via the reduction gear group 50 and the bridging cam 60, and the cam 62 is decelerated and rotated. When the spool 14 is rotated until the webbing 16 is pulled out by almost the entire amount, as shown in FIG. 8, until the large diameter portion 62A of the cam 62 does not engage with the cam side engaging portion 72 of the ALR Paul 70. The cam 62 is rotated. That is, in the reduction gear group 50, the webbing 16 is most pulled out from the spool 14 from the state in which the webbing 16 is most wound around the spool 14 (hereinafter referred to as “pre-retracted state”) (hereinafter referred to as “fully pulled out state”). The rotation of the spool 14 required up to () is reduced to a little less than one rotation to rotate the cam 62.

When the cam-side engaging portion 72 of the ALR powl 70 and the large-diameter portion 62A of the cam 62 are disengaged, the ALR powl 70 urged to one side in the rotational direction by the spring 75 is shown in FIG. It rotates (tilts) to one side in the rotation direction so that it can be displaced (tilted) to the locked position. Then, at the locked position, the V-gear side engaging tooth 73 of the ALR powl 70 is displaced to a position where it can be engaged with the external tooth 24S of the V-gear 24.

As shown in FIG. 1, according to the webbing winding device 10 of the present embodiment, the webbing 16 is pulled out from the spool 14 so that the webbing 16 is attached to the occupant seated on the vehicle seat. When the occupant seated on the vehicle seat releases the webbing 16, the spool 14 is rotated in the winding direction by a winding attachment force mechanism (not shown), and the webbing 16 is wound on the spool 14.

Here, when the occupant gets into the vehicle and the sensor detects that the occupant is seated on the vehicle seat, the coil 30 is energized in one direction as shown in FIG. As a result, the small Paul 28 is tilted from the neutral position to the W Paul limiting position, and the W Paul limiting portion 28D of the Small Paul 28 and the small Paul contact portion 26B of the W Paul 26 are arranged close to each other in the circumferential direction. .. In this state, since the tilt of the W Paul 26 from the allowable position to the lock position side is restricted, the occupant seated on the vehicle seat can quickly pull out the webbing 16 from the spool 14 and attach the webbing 16. it can. As described above, in the present embodiment, it is possible to prevent or suppress unnecessary locking of the rotation of the spool 14 when the webbing 16 is attached.

When the webbing 16 is completely attached to the occupant seated on the vehicle seat, the energization of the coil 30 is stopped. As a result, the small Paul 28 is tilted from the W Paul restricted position to the neutral position by the urging force of the leaf spring 34.

Further, when it is detected by a sensor or the like provided on the vehicle that the deceleration acceleration of the vehicle exceeds a predetermined deceleration acceleration (that is, in an emergency of the vehicle or the like), as shown in FIG. 4, the coil 30 The power is applied in the other direction. As a result, the small powl 28 is tilted from the neutral position to the locked position, and the small powl side engaging tooth 28C of the small powl 28 engages with the paw engaging tooth 38A of the holder 38. As a result, the rotation of the small powl 28 engaged with the powl engaging teeth 38A of the holder 38 and the V gear 24 supporting the small paw 28 is also restricted.

Then, due to the deceleration of the vehicle, the body of the occupant seated on the vehicle seat moves to the front side of the seat, and when the webbing 16 is pulled out from the spool 14, the spool 14 is rotated together with the main lock 22 in the pulling direction. As a result, the V-gear engaging protrusion 22A of the main lock 22 is moved along the working groove 24D of the V-gear 24 whose rotation is restricted (moved in the direction indicated by the chain double-dashed arrow), and the main lock 22 is moved. The main lock side engaging tooth of the frame 12 engages with the lock tooth 12E (see FIG. 1) of the frame 12. As a result, the rotation of the spool 14 in the withdrawal direction is restricted, and the withdrawal of the webbing 16 from the spool 14 is restricted. As a result, the body of the occupant seated on the vehicle seat is restrained by the webbing 16.

When the vehicle returns to normal running from an emergency, the energization of the coil 30 is stopped. As a result, the small Paul 28 is tilted from the locked position to the neutral position by the urging force of the leaf spring 34. Further, the spool 14 is rotated in the winding direction by a winding attachment force mechanism (not shown), and the webbing 16 drawn from the spool 14 is wound on the spool 14.

Further, when the vehicle suddenly decelerates and the body of the occupant seated on the vehicle seat moves to the front of the seat in a state where the coil 30 cannot be energized due to a disconnection of wiring or the like, the webbing 16 suddenly moves from the spool 14. Withdrawn. As a result, the V gear 24 is rotated together with the W Paul 26 in the pull-out direction. When the rotational speed of the spool 14 in the pull-out direction exceeds a predetermined speed, the centrifugal force acting on the W-powl 26 exceeds the urging force of the coil spring 32, and the W-powl 26 is in an allowable position as shown in FIG. The W-powl side engaging tooth 26C of the W-powl 26 engages with the paw-engaging tooth 38A of the holder 38 by being tilted from the position to the lock position. As a result, the rotation of the W paw 26 engaged with the paw engaging teeth 38A of the holder 38 and the V gear 24 supporting the W paw 26 is also restricted. Further, when the body of the occupant seated on the vehicle seat moves to the front of the seat and the webbing 16 is further pulled out from the spool 14, the spool 14 is rotated together with the main lock 22 in the pulling direction. As a result, the V-gear engaging protrusion 22A of the main lock 22 is moved along the working groove 24D of the V-gear 24 whose rotation is restricted (moved in the direction indicated by the chain double-dashed arrow), and the main lock 22 is moved. The main lock side engaging tooth of the frame 12 engages with the lock tooth 12E of the frame 12. As a result, the rotation of the spool 14 in the withdrawal direction is restricted, and the withdrawal of the webbing 16 from the spool 14 is restricted. As a result, the body of the occupant seated on the vehicle seat is restrained by the webbing 16. As described above, in the present embodiment, the body of the occupant seated on the vehicle seat can be restrained by the webbing 16 even when the coil 30 cannot be energized.

(ALR mechanism)
Further, when the webbing 16 is pulled out by the occupant, the spool 14 is rotated in the pulling direction. As a result, the rotation is decelerated in the order of the first gear 51, the second gear 52, the third gear 53, and the fourth gear 54 of the reduction gear group 50 from the rotation shaft 12F provided on the other side in the axial direction of the spool 14. Be transmitted. When the fourth gear 54 rotates, the bridging cam 60 also rotates in conjunction with this. When the spool 14 is rotated in the pull-out direction until the webbing 16 is almost completely pulled out, the cam 62 is rotated to the non-engaged position (see FIG. 8). As a result, the cam-side engaging portion 72 of the ALR Paul 70 and the large-diameter portion 62A of the cam 62 are disengaged, and the ALR Paul 70 is tilted by the urging force of the spring 75. When the ALR Paul 70 is tilted, the V-gear side engaging tooth 73 of the ALR Paul 70 is displaced to a position where it engages with the external tooth 24S of the V-gear 24. In this state, the rotation of the V gear 24 in the pull-out direction is restricted.
Further, when the webbing 16 is about to be pulled out, the spool 14 is rotated together with the main lock 22 in the pulling direction. As a result, the V-gear engaging protrusion 22A of the main lock 22 is moved along the working groove 24D of the V-gear 24 whose rotation is restricted (moved in the direction indicated by the chain double-dashed arrow), and the main lock 22 is moved. The main lock side engaging tooth of the frame 12 engages with the lock tooth 12E of the frame 12. As a result, the rotation of the spool 14 in the withdrawal direction is restricted, and the withdrawal of the webbing 16 from the spool 14 is restricted.
As described above, in the present embodiment, the ALR Paul 70 is configured to operate when the webbing 16 is pulled out by a predetermined length or more (in the present embodiment, when the webbing 16 is pulled out to nearly the entire amount). Then, after the operation of the ALR Paul 70, the webbing 16 cannot be pulled out and only winding is possible. After that, until the webbing 16 is wound up to a predetermined length, the rotation of the spool 14 in the pulling direction is restricted so that the webbing 16 is not pulled out.

As described above, in the present embodiment, when the spool 14 is rotated in the drawing direction by pulling out the webbing 16, the reduction gear group 50 arranged on the other side in the axial direction with respect to the spool 14 spools. The rotation of 14 in the pull-out direction is decelerated and transmitted. The rotation transmitted by the reduction gear group 50 is transmitted from the other side in the axial direction to one side with respect to the spool 14 by the bridging shaft 61. Then, the cam 62 rotates due to the rotation transmitted by the bridging shaft 61. When the cam 62 rotates to the non-engaged position, the ALR cowl 70 is displaced to the locked position, and when the ALR cowl 70 is displaced to the locked position, the rotation of the V gear 24 in the pull-out direction is restricted. As a result, the rotation of the spool 14 in the pull-out direction is restricted.
As described above, in the present embodiment, as shown in FIG. 9, of the V gear 24 and the reduction gear group 50, the V gear 24 is arranged on one side in the axial direction with respect to the spool 14, and the reduction gear group 50 is provided. It is arranged on the other side in the axial direction with respect to the spool 14. Therefore, as compared with the embodiment in which both the V gear 24 and the reduction gear group 50 are arranged on one side in the axial direction with respect to the spool 14, it becomes easy to provide a winding device having a volume balance in the axial direction. ..

Further, in the present embodiment, since the bridging shaft 61 is pivotally supported on both one side and the other side in the axial direction with respect to the spool 14, the bridging shaft 61 is stably supported.

Further, in the present embodiment, the webbing winding device 10 includes a small Paul 28. By displacing the small Paul 28 to the lock position, the rotation of the V gear 24 in the pull-out direction is restricted. Further, the webbing winding device 10 includes a coil 30. The coil 30 allows the small Paul 28 to be displaced to the locked position. Therefore, a mechanism that limits the withdrawal of the webbing 16 from the spool 14 can be electrically actuated.
Further, the reduction gear group 50 is arranged on the other side in the axial direction with respect to the spool 14, and the coil 30 is arranged on one side in the axial direction with respect to the V gear 24. Therefore, the reduction gear group 50 is not located between the coil 30 and the small Paul 28. Therefore, as compared with the embodiment in which the reduction gear group 50 is arranged between the coil 30 and the small Paul 28, the distance between the coil 30 and the small Paul 28 in the axial direction can be easily reduced. When the axial distance between the coil 30 and the small Paul 28 becomes short, the operating efficiency of the electromagnetic actuator improves.

Further, in the present embodiment, since the bridging shaft 61 and the cam 62 are arranged coaxially, it is easy to arrange the bridging shaft 61 near the spool 14, and it is possible to prevent the webbing winding device 10 from becoming large in size. it can.

In the above embodiment, an example in which the webbing take-up device 10 includes a small Paul 28 and a coil 30, that is, an example in which a lock mechanism controlled by an electromagnetic actuator is provided has been described, but the present invention is not limited thereto. The webbing take-up device does not have to include the small Paul 28 and the coil 30.

Further, in the above embodiment, an example in which the bridging shaft 61 and the cam 62 are integrally formed has been described, but the present invention is not limited thereto. For example, another gear may be interposed between the bridging shaft and the cam.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be carried out within a range not deviating from the gist thereof.

10 ... Webbing take-up device, 12 ... Frame, 14 ... Spool, 16 ... Webbing, 24 ... V gear, 28 ... Small Paul (lock member), 30 ... Coil, 36 ... Magnet (lock member), 50 ... Reduction gear group , 60 ... Bridging cam, 61 ... Bridging shaft, 62 ... Cam, 70 ... ALR Paul (Paul)

Claims (4)

The webbing attached to the occupant is wound up, and the spool is rotated in the pull-out direction by pulling out the webbing.
The V gear, which regulates the rotation of the spool in the pull-out direction by restricting the rotation in the pull-out direction,
A reduction gear group that is arranged on the other side in the axial direction with respect to the spool and that decelerates and transmits the rotation of the spool in the withdrawal direction.
A bridging shaft that transmits the rotation transmitted by the reduction gear group from the other side in the axial direction to one side with respect to the spool.
A cam that rotates by the rotation transmitted by the bridging shaft,
When the cam rotates to the non-engaged position, it is displaced to the locked position, and when it is displaced to the locked position, the rotation of the V gear in the pull-out direction is restricted.
Webbing winder equipped with. The bridging shaft is axially supported on both one side and the other side in the axial direction with respect to the spool.
The webbing winding device according to claim 1. The lock member, which is arranged inside the V gear and is displaced to the lock position to regulate the rotation of the V gear in the pull-out direction and includes a magnet,
A coil that is arranged on one side in the axial direction with respect to the V gear and that displaces the lock member to the lock position by acting on the magnet.
The webbing winding device according to claim 1 or 2. The bridging shaft and the cam are arranged coaxially.
The webbing winding device according to any one of claims 1 to 3.