JP2001233174A - Webbing winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a webbing winding device reliably applying the exciting force to a webbing belt even when deficiency occurs on a speed change means. SOLUTION: A relatively rotatable gear 54 is coaxially provided on a cone spool 44, and the gear 54 is rotated by receiving the rotating force of a cone spool 32 via gears 68, 66. When the cone spool 44 is rotated by receiving the rotation of the cone spool 32 via a cable 38, the gear 54 is rotated in the same direction as the cone spool 32, however the relative rotation quantity is very small. When the cone spool 44 is rotated by receiving the rotation of a spiral coil spring 50 after the cable 38 is cut off, the cone spool 32 is not rotated, thus the gear 54 is not rotated. When the end section 62 of a coupling groove 60 is coupled with the coupling pin of the gear 54 to press it after the cone spool 44 is rotated, the cone spool 32 is rotated to rotate a winding shaft 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a webbing winding device for winding a webbing belt for restraining a vehicle occupant.

[0002]

2. Description of the Related Art A webbing belt provided for a driver's seat or a passenger's seat of a vehicle has a base end fixed to a winding shaft of a webbing winding device. The winding shaft is urged in a direction of winding the webbing belt around the winding shaft by urging means such as a spiral coil spring. The webbing belt restrains and urges the occupant's body by the urging force of the urging means. Winding is performed on the winding shaft by the urging force of the means.

In this type of webbing take-up device,
There is also a webbing take-up device provided with a so-called tension reducer that changes the urging force of urging means acting on the take-up shaft in accordance with the amount of the webbing belt pulled out from the take-up shaft.

[0004] Such a tension reducer has, for example, a pair of cone spools having a substantially conical shape, and the ends of a string-shaped connecting member are fixed to the large-diameter side of the outer periphery of these cone spools. There is a configuration in which a cone spool is connected via a member.

In the tension reducer having the above configuration, the connecting member is wound around the outer peripheral portion while the connecting member is gradually displaced from the large-diameter portion side to the small-diameter portion side of one of the cone spools.
When the other cone spool is rotated, the other cone spool pulls out the connecting member wound around one of the cone spools from its small diameter side and gradually displaces the connecting member from its own large diameter side to its small diameter side. While being wound, one cone spool is rotated when the connecting member is pulled out.

That is, when the connecting member is wound from one of the pair of cone spools to the other, the other rotates one via the connecting member. As described above, each of the cone spools has a conical shape. Therefore, the outer peripheral length gradually changes along the axial direction. Therefore, the amount of winding of the connecting member to the cone spool and the amount of pulling out of the connecting member from the cone spool are small on the small diameter side of each cone spool and large on the large diameter side. For this reason, in the case where the connecting member is being taken up on the other large-diameter portion side while the connecting member is being pulled out from the one small-diameter portion side of one of the pair of cone spools, one rotation is performed with respect to the rotation amount of the other cone spool. On the other hand, when the connecting member is pulled out from one of the large-diameter portions of the pair of cone spools while the connecting member is wound on the other small-diameter portion, the rotation of the other cone spool is reversed. One rotation amount is small relative to the amount.

[0007] By utilizing the change in the rotation amount of the other cone spool with respect to one cone spool as described above, the winding shaft is connected to one of the cone spools and the other is urged by the urging means, so that the winding shaft is It is possible to change the urging force of the urging means that acts.

[0008]

By the way, in the webbing retractor using the tension reducer having the above-mentioned structure, when the connecting member is disconnected, the urging force of the urging means cannot be applied to the winding shaft, and the winding is stopped. The webbing belt pulled out from the shaft cannot be wound around the winding shaft.

An object of the present invention is to provide a webbing take-up device which reliably applies an urging force to a webbing belt even when a malfunction occurs in a speed change means such as a tension reducer in consideration of the above fact.

[0010]

According to a first aspect of the present invention, the webbing retractors are connected to each other via a long string-like connecting member, and at least one of the outer peripheral lengths extends along the axial direction. And the other rotates around its own axis and winds the connecting member around its own axis, so that the other rotates around its own axis and pulls out the connecting member wound around the other, and the outer periphery rotates. A speed change means having a pair of shaft members for shifting the amount of rotation of the other with respect to the amount of rotation of one by the change in length, and one end in the longitudinal direction of a long belt-shaped webbing belt for restraining the occupant's body is locked. A winding shaft that rotates around its own axis in conjunction with the rotation of one of the pair of shaft members, and the connecting member and the pair of shafts that rotate the other of the pair of shaft members around the axis of the shaft member. Through one of the members And urging means for urging in a direction winds the webbing belt in Kimaki shaft, which is connected to one of the shaft members of said pair of shaft members,
In a rotation state of only one of the pair of shaft members, the shaft member on the biasing means side is connected to the other shaft member by rotation of a predetermined angle, and in a connection state with the other one, Clutch means for transmitting the rotational force of the shaft member on the biasing means side to the shaft member on the winding shaft side.

According to the webbing take-up device having the above structure,
When the webbing belt wound on the winding shaft is pulled out from the winding shaft, the winding shaft rotates around its own axis, and the rotation is relatively positioned on the winding shaft side of the pair of shaft members. The shaft member on the winding shaft to which the rotation of the winding shaft is transmitted is transmitted to the shaft member on the winding shaft side, and the shaft member on the winding shaft that is rotated around its own axis and relatively positioned on the biasing device side. The connection member wound around the shaft member is wound up while being pulled out. The shaft member on the urging means side rotates against the urging force of the urging means in accordance with the amount of withdrawal of the connecting member by pulling out the connecting member by the rotation of the shaft member on the winding shaft side. Here, since the outer peripheral length of at least one of the shaft members changes along the axial direction, the winding amount and the withdrawal amount of the connecting member change per rotation as the outer peripheral length changes. As described above, since the winding amount and the withdrawal amount of the connecting member change, the urging force of the urging means acting on one shaft member via the other shaft member and the connecting member changes. The binding force of the occupant changes.

At this time, the clutch means is directly or indirectly connected to one of the pair of shaft members, but as long as the pair of shaft members is connected by the connecting member. Is that when one of the shaft members rotates, the other rotates in conjunction (in other words, only one of the shaft members rotates and the other does not stop), so that the clutch means Is not connected to either of the other shaft members.

For example, when the restraining state of the occupant by the webbing belt is released and the tip of the webbing belt is released, the drag against the urging force of the urging means is released, and the urging means is urged by the urging force. By rotating the shaft member on the device side, the connecting member wound on the shaft member on the winding shaft side is pulled out, and is wound around the outer peripheral portion of the shaft member on the biasing device side.
The shaft member on the winding shaft side rotates around its own axis when the connecting member is pulled out, and rotates the winding shaft in the direction of winding the webbing belt. The webbing belt whose tip is free in this manner is wound up on a winding shaft.

By the way, when the connection of the pair of shaft members via the connecting member is released by cutting the connecting member, the winding of the connecting member of the shaft member and the winding of the connecting member from the shaft member are naturally performed. The urging force of the urging means cannot be transmitted to the spindle. However, if the webbing belt is pulled out from the winding shaft, the connection between the pair of shaft members via the connection member is released, so that the force against the urging force of the urging means does not act. Only the shaft member on the urging means side is rotated by the urging force of the urging means. When the shaft member on the biasing means side is rotated by a predetermined amount or more in a state where the shaft member on the winding shaft side is stopped, the clutch means directly or indirectly connected to any one of the shaft members is turned on the other one. It is connected directly or indirectly to the shaft member. Thereby, the rotation of the shaft member on the urging means side is transmitted to the shaft member on the winding shaft side, and the shaft member on the winding shaft side is rotated by the urging force of the urging means, and the webbing belt is moved to the winding shaft. Is wound up, or
The webbing belt receiving the urging force of the urging means restrains the occupant.

According to a second aspect of the present invention, in the webbing take-up device according to the first aspect, the clutch means interlocks with rotation of the one of the pair of shaft members. A rotating body that rotates around a rotation center of one of the other shaft members of the pair of shaft members; and a rotating body provided on at least one of the other one of the shaft members and the rotating body; An engagement portion that engages with the other at a predetermined rotational position of the rotating body with respect to a member, and in the engagement state between the engagement portion and the other shaft member, the engagement portion and One of the engaged sides engaged with the engagement presses the other around the rotation center of the other shaft member.

According to the webbing take-up device having the above structure,
The rotating body of the clutch means rotates around the rotation center of one of the pair of shaft members. Therefore,
If any other shaft member is a shaft member on the winding shaft side,
When the biasing means rotates the shaft member on the biasing means side in a state where the connection of the pair of shaft members by the connecting member is released, the rotating body is rotated in conjunction with the rotation of the shaft member on the biasing means side. Around the center of rotation of the side shaft member. If one of the other shaft members is a shaft member on the urging means side, the urging means rotates the shaft member on the urging means side in a state where the connection of the pair of shaft members by the connecting member is released. Also, since the shaft member on the winding shaft side, which is one of the shaft members, does not rotate, the rotating body does not rotate. However, as described above, since the shaft member on the urging means side rotates, the rotating body relatively rotates around the rotation center of the shaft member on the urging means side.

In this way, when the rotating body rotates relative to the other shaft member by a predetermined angle, the engaging portion provided on at least one of the other shaft member and the rotating body moves to the other. When the shaft member on the urging means side is further rotated by the urging force of the urging means in this engaged state, the engaging portion and the side on which the engaging portion is engaged (ie, the engaged side) Either one presses the other around the center of rotation of the other shaft member to rotate the shaft member on the winding shaft side in a direction corresponding to the direction in which the webbing belt is wound around the winding shaft. Thereby, the webbing belt is wound on the winding shaft, or
The webbing belt receiving the urging force of the urging means restrains the occupant.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <Configuration of First Embodiment> FIG.
FIG. 1 shows a side view of a webbing retractor 10 according to a first embodiment of the present invention, and FIG. 1 shows an exploded perspective view of a configuration of a main part of the webbing retractor 10. .

As shown in FIG. 3, the webbing take-up device 10 includes a frame 18 having three side walls 12, 14, 16 opposed to each other along the thickness direction. Between the side wall 12 at the center in the width direction of the frame 18 and the side wall 16 on one side in the width direction, a winding shaft 20 extending in the axial direction along the thickness direction of the side walls 12 to 16 is arranged.
Both ends of the winding shaft 20 are supported by the side walls 12 and 16 so as to be rotatable around its own axis. One end in the longitudinal direction of a long belt-shaped webbing belt 24 is locked at an axially intermediate portion of the winding shaft 20. The webbing belt 24 is housed in a state wound around the winding shaft 20, and can be restrained by pulling out and engaging a tongue plate provided at the tip thereof with a buckle attached to the vehicle.

Further, one end of the winding shaft 20 in the axial direction is connected to the side wall 1.
2, a gear 26 having external teeth is coaxially fixed at the tip end thereof as shown in FIG. A shaft member (a shaft member on the take-up shaft side, one of the shaft members) and a later-described cone spool 44 and a cable 38 are provided on the rotation radial direction side of the gear 26.
In addition, a cone spool 32 constituting the transmission 30 as a speed change means is arranged.

The cone spool 32 has a substantially conical shape whose outer diameter gradually decreases from one end in the axial direction to the other end, and is provided at one end in the axial direction (ie, the end on the large diameter side). The gear portion 34 having external teeth is formed coaxially. The axial direction of the cone spool 32 including the gear portion 34 is the same as the axial direction of the gear 26 (that is, the winding shaft 20).
, The gear portion 34 of the cone spool 32 meshes with the gear 26.

Further, a spiral spiral groove 36 is formed in the outer peripheral portion of the cone spool 32 around the axis of the cone spool 32, and the spiral at one axial end (ie, the large diameter side) of the cone spool 32 is formed. At one end of the groove 36 or in the vicinity thereof, one longitudinal end of a cable 38 as a connecting member is locked. The outer diameter of the cable 38 is smaller than the width of the spiral groove 36,
By rotating the cable 2 around its axis, the cable 38 can be spirally wound while accommodating the cable 38 inside the spiral groove 36.

A shaft (not shown) protrudes coaxially from one end of the cone spool 32 in the axial direction, and is rotatably supported on the side wall 12. A shaft 42 protrudes coaxially from the end and is rotatably supported by the side wall 14.

Further, a cone spool 44 as a shaft member (a shaft member on the side of the urging means or one of the other shaft members) is disposed on the side of the cone spool 32 in the rotation radial direction. The cone spool 44 has a conical shape whose axis is parallel to the axis of the cone spool 32.
The outer diameter of the cone spool 32 gradually decreases in the direction from the small-diameter portion side to the large-diameter portion side (that is, the cone spool 32 and the cone spool 44 are arranged so that their axes are parallel to each other). However, the direction from the large diameter part to the small diameter part is opposite). Also, the cone spool 44
A spiral groove 46 having a spiral shape centered on the axis of the cone spool 44 is formed in the outer peripheral portion of the cone spool 4.
The other end of the cable 38 in the longitudinal direction is locked at or near the end of the spiral groove 46 at one end in the axial direction (that is, at the large diameter side). The width dimension of the spiral groove 46 is the cable 38
By rotating the cone spool 44 about its axis, the cable 38 can be spirally wound while accommodating the cable 38 inside the spiral groove 46.

Here, when the cable 38 is completely pulled out from one of the cone spool 32 and the cone spool 44, substantially all of the cable 38 is wound around the other of the cone spool 32 and the cone spool 44. Therefore, the cone spool 32 and the cone spool 44
Of the cone spool 32 and the cone spool 44, the side from which the cable 38 is drawn out is higher than the side from which the cable 38 is wound up, by rotating the side from which the cable 38 is drawn out around its own axis. Cable 3
8 is pulled out and wound around its own periphery. At this time,
The side from which the cable 38 is pulled out rotates around its own axis when the cable 38 is drawn out. That is, the cone spool 32 and the cone spool 44 are connected to the cable 3
The connection at 8 allows rotation to be transmitted from one to the other.

Further, from one end in the axial direction of the cone spool 44 (ie, the end on the large diameter side), a shaft 48 is formed so as to protrude coaxially, and is rotatably supported on the side wall 14. Further, a spiral coil spring 50 as a biasing means is disposed around the shaft portion 48. The spiral coil spring 50 has a longitudinal end portion on the center side of the spiral drawn by itself fixed to the outer peripheral portion of the shaft portion 48 and an outer end portion of the spiral drawn by itself fixed to the side wall 14. ing. The spiral coil spring 50 has a biasing force to return to its original state when one end in the longitudinal direction is relatively displaced relative to the other end around the center. Therefore, the shaft portion 48 is rotated and the spiral coil spring 50 is rotated.
When the center end is rotationally displaced with respect to the outer end, the spiral coil spring 50 urges the shaft 48 to rotate in the opposite direction. The rotation direction of the shaft portion 48 in the direction of squeezing the spiral coil spring 50 around its own axis (that is, the direction of increasing the number of windings) is the same as the rotation direction of the above-described winding shaft 20 in the direction in which the webbing belt 24 is pulled out. It corresponds to the direction.

A shaft portion 52 projects from the other end of the cone spool 44 in the axial direction, and is rotatably supported on the side wall 12.

Further, a gear 54 serving as clutch means having external teeth is coaxially arranged on one side (large diameter side) in the axial direction of the cone spool 44. A through hole 56 is formed at the center of the gear 54. The outer diameter of the through hole 56 is set to be slightly larger than the outer diameter of the shaft portion 48.
The gear 54 is rotatable relative to the cone spool 44 around the shaft portion 48 when the. As shown in FIG. 2, in a set state of the gear 54 in which the shaft portion 48 penetrates the through hole 56 with respect to the cone spool 44, the gear 54 is engaged with the end surface of the gear 54 on the side opposite to one axial end surface of the cone spool 44. A mating pin 58 is formed to protrude. The engagement pin 58 is provided so as to be displaced radially outward with respect to the center of the gear 54, so that when the gear 54 rotates relative to the cone spool 44, the engagement pin 58 engages around the axis of the cone spool 44. The pin 58 rotates relative to the cone spool 44.

On the other hand, as shown in FIG. 1, an arc-shaped engagement groove 60 is formed on one end face of the cone spool 44 in the axial direction. The engagement groove 60 is formed corresponding to the rotation locus of the engagement pin 58 with respect to the cone spool 44 when the gear 54 relatively rotates with respect to the cone spool 44 about the shaft portion 48. In the set state with respect to the cone spool 44, the engagement pin 58 enters the engagement groove 60, and the gear 54
Is rotated relative to the cone spool 44, the engagement pin 58 rotates inside the engagement groove 60.

Further, the engagement groove 60 is not formed uniformly around the axis of the cone spool 44, and is generally substantially C
And both ends 62, 64 in the longitudinal direction of the engagement groove 60.
When the engaging pin 58 is in contact, the engaging pin 58 cannot rotate relative to the cone spool 44.

Further, a gear 66 whose axial direction is parallel to the axial direction of the cone spool 44 is disposed on the side of the cone spool 44 in the radial direction of rotation.
And the external teeth of the gear 66 mesh with each other. On the other hand, a gear 68 whose axial direction is parallel to the axial direction of the cone spool 32 is disposed on the rotation radial direction side of the gear portion 34, and the gear portion 34 of the cone spool 32 and the gear 68.
And are engaged. The gear 66 and the gear 68 are arranged coaxially with each other, and are each integrally connected by a shaft 70. Both ends in the axial direction of the shaft 70
The gear 66 and the gear 68 protrude, and are rotatably supported by the side walls 12 and 14 (not shown).

Gear 66 integrated by shaft 70
The gear portion 34 of the cone spool 32 through the
The gear ratio of the gear train constituted by the gear portion 34 of the cone spool 32, the gear 68, the gear 66, and the gear 54 (gear ratio) is as follows.
At this time, the rotation speed of the cone spool 44 required to pull out one of the cables 38 from one of the cone spool 32 and the cone spool 44 and wind the whole of the cable 38 The rotation speed of the gear 54 according to the rotation speed of the cone spool 32 is set to be slightly lower.

<Operation and Effect of First Embodiment>
The operation and effect of the present embodiment will be described.

In the present webbing take-up device 10, when the webbing belt 24 is taken up by the take-up shaft 20, substantially all of the cable 38 is taken up by the outer peripheral portion of the cone spool 44, that is, by the spiral groove 46. Along with
The engagement pin 58 is located in the engagement groove 60 near the end 62. In this state, no external force acts on the spiral coil spring 50 and the shaft 48
(That is, the cone spool 44) is not energized.

When the webbing belt 24 is pulled out in this state, the winding shaft 20 rotates, and the gear portion 34 of the cone spool 32 in which the gear 26 integrated with the winding shaft 20 meshes is rotated. When the gear portion 34 rotates, the gear portion 34 winds up the cable 38 inside the spiral groove 36 from one end side (large diameter portion side) in the axial direction. The gear part 34 is the cable 3
8, the cable 38 wound around the outer periphery of the cone spool 44 while being housed in the spiral groove 46 of the cone spool 44 becomes the other end of the cone spool 44 in the axial direction (small diameter side). ) Is gradually drawn from
The cone spool 44 rotates according to the length of the cable 38 pulled out.

At this time, when the cone spool 32 makes one rotation, the cable 38 is pulled out from the cone spool 44 by a length substantially equal to the outer peripheral length of the cone spool 44 on the large-diameter portion side and wound around the cone spool 32. The rotation speed of the cone spool 44 with respect to the cone spool 32 is different from that of the cone spool 32 by the difference between the outer peripheral length of the cone spool 32 on the large diameter side and the outer peripheral length of the cone spool 44 on the small diameter side.

Further, as the cone spool 32 rotates, the cable 38 is guided by the spiral groove 36 and is wound around the outer peripheral portion at an intermediate portion in the axial direction having a diameter smaller than one axial end of the cone spool 32. At this time, the cable 38 is further drawn out from the cone spool 44, and the cable 38 is drawn out from the axially intermediate portion having a diameter larger than the other axial end of the cone spool 44. In this state, the cone spool 3 at the portion where the cable 38 is wound around is
2 is different from the outer peripheral length of the cone spool 44 at the portion where the cable 38 is pulled out, the rotation speed of the cone spool 44 with respect to the cone spool 32 is different from the initial rotation of the cone spool 32.

When the cone spool 32 is further rotated from this state to a state immediately before the winding of the cable 38 around the outer periphery of the cone spool 32 is completed, the other end of the cone spool 32 in the axial direction, that is, the cone spool 32 The cable 38 is wound around the small diameter portion. On the other hand, at this time, most of the cable 38 is
Therefore, the cable 38 is pulled out from one end of the cone spool 44 in the axial direction, that is, from the large diameter portion of the cone spool 44. At this time, the outer peripheral length of the cone spool 32 at the portion where the cable 38 is wound and the outer peripheral length of the cone spool 44 at the portion where the cable 38 is pulled out are different from those at the beginning of the rotation of the cone spool 32. Since the difference is further different, the rotation speed of the cone spool 44 with respect to the cone spool 32 is further different from that at the beginning of the rotation of the cone spool 32. Thus, the rotation speed of the cone spool 44 when the cone spool 32 makes one rotation gradually changes.

When the cable 38 is pulled out, the cone spool 44 that rotates in the same direction as the rotation direction of the cone spool 32 rotates a shaft 48 that is integral with the cone spool 44. As the shaft 48 rotates, the spiral coil spring 50 whose center end is locked to the shaft 48 is squeezed (ie, the number of windings is increased). Energize in the opposite direction.

Since the rotation of the shaft 48 is started with the withdrawal of the webbing belt 24 from the winding shaft 20, the biasing force of the spiral coil spring 50 is applied from the start to the end of the withdrawal of the webbing belt 24 from the winding shaft 20. During the rotation of the webbing belt 24,
8, the number of revolutions of the cone spool 44 with respect to the cone spool 32 gradually changes, so that the spiral coil spring 50 moves the winding shaft 2 in accordance with the change in the number of revolutions.
The magnitude of the urging force in the direction in which the webbing belt 24 is wound up and applied to 0 changes. Thereby, the restraining force given to the occupant by the winding shaft 20 changes in accordance with the amount of pulling out of the winding shaft 20.

On the other hand, the webbing belt 2
4 is pulled out and the winding shaft 20 rotates, so that the gear 2
The gear 68 connected to the take-up shaft 20 via 6 rotates. As the gear 68 rotates and the gear 66 rotates integrally therewith, the gear 54 meshed with the gear 66 rotates. However, the gear 54 is basically rotatable relative to the cone spool 44. In addition, the gear ratio of the rotation of the cone spool 32 from the gear portion 34 to the gear 54 via the gears 68 and 66 is such that the cable 38 is substantially entirely wound around one of the cone spool 32 and the cone spool 44. Cone spool 4 required to pull out one of the other from the taken state and wind up substantially all of cable 38
4 and the rotation speed of the gear 54 corresponding to the rotation speed of the cone spool 32 at this time are set to be slightly lower.
There is no contact with 4. That is, in this case, the gear 5
Numeral 4 merely rotates relative to the cone spool 44, does not apply any external force to the cone spool 44 or the spiral coil spring 50, and does not impede the rotation of the cone spool 44. .

When the drawn webbing belt 24 is wound around the winding shaft 20, the force against the urging force of the spiral coil spring 50 may be released by releasing the tip of the webbing belt 24. When the force against the urging force of the spiral coil spring 50 is released, the spiral coil spring 50 rotates the cone spool 44 via the shaft 48 by the urging force, and the cable 38 wound around the cone spool 32 is It is pulled out from the spool 32 and wound up on its own outer peripheral portion along the engaging groove 60. When the cable 38 is pulled out, the cone spool 32 rotates around its own axis to rotate the gear 26, and rotates the winding shaft 20 integral with the gear 26 in a direction in which the webbing belt 24 is wound. Thereby, the webbing belt 24 is wound around the winding shaft 20 and stored.

If the cable 38 is cut while the webbing belt 24 is pulled out from the winding shaft 20 and the connection between the cone spool 32 and the cone spool 44 via the cable 38 is released, the cable 38 Of the urging force of the spiral coil spring 50 through the winding shaft 20
Can not be communicated.

This state is a state in which the shaft portion 48 is rotated, and the spiral coil spring 50 urges the shaft portion 48, so that the spiral coil spring 50 attempts to rotate the shaft portion 48. Absent. The cone spool 44, which has been disconnected from the cone spool 32 via the cable 38, is released from the restrained state due to the tension of the cable 38, and starts rotating by the urging force of the spiral coil spring 50. As described above, since the shaft 52 is rotatable relative to the cone spool 44, the engagement pin 58 of the shaft 52 moves along the gear 66 of the cone spool 44.

However, when the connection between the cone spool 32 and the cone spool 44 by the cable 38 is released, the cone spool 32 does not basically rotate even if the cone spool 44 rotates. Does not rotate gear 54 via gear 26, gear 68, and gear 66. Therefore, the engagement pin 58 reaches the end 62 of the engagement groove 60 before the cone spool 44 makes one rotation, and the spiral coil spring 50
The engagement pin 58 presses the end 62 of the engagement groove 60 in the direction of rotation of the cone spool 44 due to the urging force, and the gear 54 starts rotating integrally with the cone spool 44. The rotation of the gear 54 together with the cone spool 44 causes the gear 66 meshing with the gear 54 to start rotating, and the gear 26 meshing with the gear 68 rotates via the gear 68 integrated with the gear 66.
As a result, the winding shaft 20 attempts to rotate in the direction in which the webbing belt 24 is wound. At this time, if the leading end of the webbing belt 24 is free, the winding shaft 20 is rotated to move the webbing belt 20 to the winding shaft 20. If the end of the webbing belt 24 is not free, the urging force of the spiral coil spring 50 is applied to the cone spool 44, the gear 54, the gear 66, the gear 68, the gear 26, and the winding shaft 20.
Is applied to the webbing belt 24, and the urging force restrains the occupant's body, for example.

On the other hand, if the connection between the cone spool 32 and the cone spool 44 by the cable 38 is released while the webbing belt 24 is wound on the winding shaft 20, the webbing belt 24 is pulled out and wound. Even if the take-up shaft 20 is rotated and the rotation of the take-up shaft 20 is transmitted to the cone spool 32 via the gear 26 to rotate the cone spool 32, the cone spool 44 does not rotate.

However, when the gear 26 rotates, the gear 68 meshing with the gear 26 rotates, and the gear 66 integral with the gear 68 rotates the gear 54 meshing with the gear 66. At this time, the gear 54 is rotatable relative to the cone spool 44, and since the connection by the cable 38 is released even when the cone spool 32 rotates, the cone spool 44 remains stopped. The engagement pin 58 reaches the end 64 of the engagement groove 60 before the gear 54 makes one rotation, and the engagement pin 58 moves the end 64 of the engagement groove 60 toward the rotation direction of the gear 54. Press.
As a result, the cone spool 44 rotates integrally with the gear 54, and the shaft portion 48 integral with the cone spool 44 rotates in the direction of reducing the spiral coil spring 50 (that is, the direction of increasing the number of turns). For this reason, the spiral coil spring 50 urges the shaft portion 48 in a direction opposite to the rotation direction of the shaft portion 48 at this time. Therefore, cable 3
8, even if the connection between the cone spool 32 and the cone spool 44 is released, the webbing belt 24 is pulled out from the winding shaft 20 so that the spiral coil spring 5
The urging force of 0 can be applied to the webbing belt 24.

As described above, in the webbing take-up device 10, the cable 3 is temporarily cut by cutting the cable 38 or the like.
Even when the connection between the cone spool 32 and the cone spool 44 via the connection 8 is released, the urging force of the spiral coil spring 50 can be applied to the webbing belt 24 pulled out from the winding shaft 20.

<Modification of First Embodiment> In this embodiment, the cone spool 32 is any one of the shaft members according to the present invention described in claim 1, and the cone spool 44 is a claim. Item 1 is the configuration of the other one of the shaft members according to the present invention. However, the cone spool 32 is the other one of the shaft members, and the cone spool 44 is the one of the other shaft members. It is also possible.

That is, the engaging groove 60 is formed not in the cone spool 44 but in the cone spool 32, and, for example, the cone spool 3 is formed not in the shaft portion 48 of the cone spool 44.
In addition to the configuration in which the through hole 56 of the gear 54 penetrates through the second shaft portion 40, the external gear is formed coaxially at one axial end (the large-diameter portion side end) of the cone spool 44. 66
The gear of the cone spool 44 and the gear 54 may be connected via the gear 68 and the gear 68. In this case, the gear 54 serving as the clutch means always rotates in conjunction with the cone spool 44 (that is, the gear 54 is always connected to the cone spool 44), and the engagement pin 58 is connected to the end of the engagement groove 60. The operation is different in that the contact is made to the cone spool 32 by abutting on the portion 62 or the end portion 64, but the effect associated therewith is basically the same as the effect described above.

<Structure of the Second Embodiment> Next, another embodiment of the present invention will be described. In the following description, parts that are basically the same as those in the first embodiment or the previously described embodiment are denoted by the same reference numerals, and description thereof is omitted. I do.

FIG. 4 is an exploded perspective view showing the configuration of a webbing take-up device 90 according to a second embodiment of the present invention.

As shown in this figure, the webbing take-up device 90 is replaced with a planetary gear 9 described later in place of the gear 54.
4. Gear 9 which constitutes clutch means together with sun gear 98
2 is provided. The gear 92 differs from the gear 5 in that external gears are formed on the outer periphery thereof and mesh with the gear 66.
Same as 4. However, as shown in FIG. 5, the surface of the gear 92 on the side facing the cone spool 44 is formed as a concave recess 93 having a substantially circular opening on the inner side of the outer peripheral portion toward the cone spool 44 side. On its inner peripheral portion, an internal gear that is sufficiently larger than the outer diameter of the shaft portion 48 is formed.

A planetary gear 94 as a rotating body meshing with the internal teeth of the gear 92 is disposed inside the gear 92. The planetary gear 94 rotates while rotating, and the inside of the gear 92 moves in accordance with the rotation speed. It revolves around the center of 92. Further, a stopper 96 as an engaging portion is provided between one of the plurality of tooth grooves between the plurality of external teeth of the planetary gear 94, and a portion of the tooth where the stopper 96 is provided is provided with a stopper 96. At least a portion (in the present embodiment, one end side of the axially intermediate portion of the planetary gear 94) is a stopper 9
6 filled. Therefore, in the portion where the stopper 96 is provided, the internal teeth of the gear 92 cannot enter, and the planetary gear 94 cannot further rotate and revolve.

Further, as shown in FIG. 4, in the webbing take-up device 90, the sun gear 98
The number of teeth is smaller than the number of teeth of the planet gear 94. The planetary gear 94 described above meshes with the sun gear 98. Further, a stopper 100 as an engagement portion is formed in one of the plurality of tooth spaces between the plurality of external teeth of the sun gear 98, and at this portion, at least a portion of the tooth space ( In the present embodiment, the shaft 48
The tooth groove is filled with the stopper 100 at a position closer to the distal end than the intermediate portion in the direction along the axial direction of (1). Therefore, the external teeth of the planetary gear 94 cannot enter the portion where the stopper 100 is provided, and the planetary gear 94 cannot further rotate and revolve. The number of teeth of the external teeth of the sun gear 98, the external teeth of the planetary gear 94, and the internal teeth of the gear 92, or the arrangement position of the planetary gear 94 with respect to the sun gear 98 and the gear 92 is formed with a stopper 100. When the external teeth of the planetary gear 94 try to enter the tooth groove, the internal teeth of the gear 92 are set to enter the tooth groove of the planetary gear 94 where the stopper 96 is formed.

In the webbing take-up device 90, the rotational direction of the gear 92 due to the rotational force of the gear 68 transmitted through the gear 68 and the gear 68 when the gear 26 rotates due to the number of gears. And the direction of rotation of the cone spool 44 by the rotational force of the gear 26 transmitted via the cone spool 32 and the cable 38 is the same. Therefore, when the gear 26 rotates, the planet gear 94 rotates and revolves only by the difference between the rotation speed of the gear 92 and the rotation speed of the cone spool 44 (that is, the actual rotation of the cone spool 44 and the gear 92). The relative rotation speed of the gear 92 with respect to the cone spool 44 is smaller than the rotation speed,
The rotation speed of the planet gear 94 is determined by the relative rotation speed).

Here, the gear ratio of the gear train composed of the gear 26, the gear 68, the gear 66, the external teeth of the gear 92, the internal teeth of the gear 92, the planetary gear 94, and the sun gear 98 in the webbing winding device 90 is described. The gear ratio is determined based on the rotation of the cone spool 44 required to pull out one of the cone spools 32 and 44 from the state in which the cable 38 is substantially entirely wound and pull out the substantially entire cable 38. With the rotation of the planetary gear 94 according to the difference between the number of rotations of the gear 92 and the rotation speed of the gear 92 at this time, the internal teeth of the gear 92 are rotated by the rotation of the planetary gear 94 provided with the stopper 96. The planetary gear 94 does not attempt to enter the tooth space and the outer teeth of the planetary gear 94 do not attempt to enter the tooth space of the sun gear 98 provided with the stopper 100.
Is set to the extent that is rotated. Therefore, in a state where the cone spool 32 and the cone spool 44 are connected via the cable 38, the planetary gear 94 simply rotates while revolving around the sun gear 98, and the gear 92 rotates around the sun gear 98. It just spins.

<Operation and Effect of Second Embodiment> In the present webbing take-up device 90, the cable 38 is cut off through the cable 38 while the webbing belt 24 is pulled out from the take-up shaft 20. When the connection state between the cone spool 32 and the cone spool 44 is released, first, the cone spool 44 is biased by the biasing force of the spiral coil spring 50 as in the first embodiment.
Rotates. When the cone spool 44 rotates, the shaft 4
The external teeth of the sun gear 98 formed at 8 press the external teeth of the planetary gear 94. If the planetary gear 94 does not rotate even if the planetary gear 94 receives the pressing force from the external gear of the sun gear 98, the external gear of the planetary gear 94 presses the internal gear of the gear 92 to make the gear 92 cone. It is rotated integrally with the spool 44. Further, when the external teeth of the planetary gear 94 receive the pressing force from the external teeth of the sun gear 98, the planetary gear 94 receives the pressing reaction force from the internal teeth of the gear 92, and the planetary gears 94 receive the pressing force. Gear 94
May rotate. In this case, the gear 92 starts rotating, and the winding shaft 20 is once rotated in a direction in which the webbing belt 24 is pulled out via the gears 68, 66, and 26. However, the planet gears 94 are
Stopper 100 before making one relative rotation around
The external teeth of the planetary gear 94 try to enter the tooth groove provided with the gears. Further, at this time, the internal teeth of the gear 92 attempt to enter the tooth grooves of the planetary gear 94 provided with the stopper 96.
The external teeth of the planet gear 94 abut against the stopper 100 and the gear 9
2 comes into contact with the stopper 96 so that the planetary gear 9
4 cannot rotate and revolve. In this state, the planetary gear 94 which has received the rotational force of the cone spool 44 from the external teeth of the sun gear 98 transmits the internal gear of the gear 92 as it is to rotate the gear 92 to rotate the cone spool 44. Rotate in the same direction as the direction.

That is, although a slight time difference occurs,
If the planet gear 94 tries to rotate when the cone spool 44 rotates, the gear 92 is rotated integrally with the cone spool 44.

As described above, the cone spool 44, the planet gear 94, and the gear 9 are rotated in a state where the planet gear 94 does not rotate.
2. The winding shaft 20 receiving the urging force of the spiral coil spring 50 via the gear 68, the gear 66, and the gear 26 tends to rotate in a direction in which the webbing belt 24 is wound. Therefore, at this time, if the leading end of the webbing belt 24 is free, the webbing belt 24
If it is not free, for example, it restrains the occupant's body.

On the other hand, if the cable 38 is cut while the webbing belt 24 is wound on the winding shaft 20 and the connection between the cone spool 32 and the cone spool 44 via the cable 38 is released. , Winding shaft 20
When the webbing belt 24 is pulled out of the gear 26, the gear 26 rotates and the gear 68 meshing with the gear 26 and the gear 92 meshing with the gear 66 via the gear 66 are rotated. At this time, since the connection between the cone spool 32 and the cone spool 44 by the cable 38 has been released, the gear 26
, The cone spool 44 does not rotate even if the cone spool 32 rotates.

However, if the planetary gear 94 which receives the pressing force from the internal teeth of the gear 92 by the external teeth does not rotate when the gear 92 rotates, the planetary gear 94 rotates integrally with the gear 92, and The external teeth of the gear 94 press the external teeth of the sun gear 98 to rotate the sun gear 98, that is, the shaft portion 48 integrally.

When the planetary gear 94, which receives the pressing force from the internal teeth of the gear 92 and the pressing reaction force from the external teeth of the sun gear 98 by the external teeth when the gear 92 rotates, rotates on the planetary gear, The gear 94 revolves around the center of the gear 92. As described above, since the connection between the cone spool 32 and the cone spool 44 by the cable 38 is released, even if the cone spool 32 rotates through the gear 26, the cone spool 44 does not rotate. Gear 98 is also stopped. Therefore, in this state, the planetary gear 9
4 simply revolves around the sun gear 98, or rotates the sun gear 98 meshing with the planetary gear 94 in a direction to reduce the number of turns of the spiral coil spring 50. Regardless of whether the planetary gear 94 revolves around the sun gear 98 or the planetary gear 94 rotates the sun gear 98, the planetary gear 9 rotates around the sun gear 98.
Prior to the rotation of 4 by one rotation, the external teeth of the planetary gear 94 try to enter into the tooth space where the stopper 100 is provided.
At this time, the internal teeth of the gear 92 try to enter the tooth groove of the planetary gear 94 provided with the stopper 96. Planetary gear 9
As the external teeth of No. 4 abut against the stopper 100 and the internal teeth of the gear 92 abut against the stopper 96, the planetary gear 94 cannot rotate and revolve. Planetary gear 9 receiving rotational force
4 transmits the gear 92 directly to the internal teeth of the gear 92 to rotate the gear 92 in the same direction as the rotation direction of the cone spool 44.

That is, even when the connection between the cone spool 32 and the cable 38 by the cable 38 is released, a slight time difference occurs, but when the gear 92 rotates, the planetary gear 94 tries to rotate. Further, even if the sun gear 98 is rotated by the planetary gear 94 or the sun gear 98 is not rotated, the shaft portion 48 (that is, the cone spool 44) is rotated integrally with the gear 92. Therefore, the shaft 4 rotating with the gear 92
8 (i.e., the cone spool 44) rotates in a direction to narrow the spiral coil spring 50 (i.e., a direction to increase the number of turns of the spiral coil spring 50), and the spiral coil spring 50 increases its urging force, and
To rotate in the opposite direction.

As described above, in the webbing take-up device 90, the cable 3 is temporarily cut by cutting the cable 38 or the like.
Even when the connection between the cone spool 32 and the cone spool 44 via the connection 8 is released, the urging force of the spiral coil spring 50 can be applied to the webbing belt 24 pulled out from the winding shaft 20.

<Modification of Second Embodiment> In the present embodiment, the cone spool 32 is any one of the shaft members according to the first aspect of the present invention, and the cone spool 44 is a second embodiment. Item 1 is the configuration of the other one of the shaft members according to the present invention. However, the cone spool 32 is the other one of the shaft members, and the cone spool 44 is the one of the other shaft members. It is also possible.

That is, instead of the shaft portion 48, a sun gear 98 having a stopper 100 provided on the shaft portion 40 is formed, and the gear 92 is arranged so that the shaft portion 40 becomes the center, and the gear 92 and the sun gear 98 are formed. The planetary gear 94 is disposed between the two.
A gear having external teeth may be coaxially and integrally formed at one end in the axial direction of the cone spool 44 (that is, the end on the large diameter portion side), and may be connected to the gear 92 via the gear 66 and the gear 68. it can. In this case, the gear 92 and the planetary gear 94 as the clutch means always rotate in conjunction with the cone spool 44 (that is, the gear 92 and the planetary gear 94 are always connected to the cone spool 44), and the stopper 100 is moved. The planetary gear 94 is provided in the tooth space of the sun gear 98 provided.
Planetary gear 9 in which the external teeth of the
The operation is different in that the internal teeth of the gear 92 are in contact with the cone spool 32 when the internal teeth of the gear 92 are in contact with the fourth tooth groove, but the effect accompanying this is basically the same as the effect described above.

<Structure of Third Embodiment> Next, a third embodiment of the present invention will be described.

FIG. 6 is an exploded perspective view showing a configuration of a main part of a webbing take-up device 120 according to a third embodiment of the present invention. As shown in this figure, the webbing take-up device 120 does not include the gear 26, and furthermore, has one end in the axial direction of the cone spool 32 (that is,
The gear portion 34 is not formed at the large-diameter portion side end), and the cone spool 32 is directly connected to the winding shaft 20.
Further, the other end in the axial direction of the cone spool 32 (that is,
A gear 122 having external teeth is formed coaxially on the small-diameter portion end), and the shaft portion 42 is formed on the cone spool 32 via the gear 122. A gear 126 having external teeth is provided on the rotation radial side of the gear 122. The gear 126 has its axial direction parallel to the axial direction of the gear 122 (that is, the axial direction of the cone spool 32), and its external teeth mesh with the external teeth of the gear 122. At the center of the gear 126, a through hole 128 whose inner diameter is slightly larger than the outer diameter of the shaft portion 48 is coaxial with the tip circle of the external teeth of the gear 126 (virtual circle passing through all the tips). The shaft 48 penetrates through the gear 12
6 is coaxial with the cone spool 44 and has a shaft portion 48.
It is set so as to be rotatable relative to the cone spool 44 around it.

As shown in FIG. 7, the cone spool 4
In the set state with respect to 4, the locking pin 130 is formed on the surface of the gear 126 on the side facing one end (that is, the large-diameter end) of the cone spool 44 along the axial direction of the cone spool 44. In addition, one end of the connection band 132 as the clutch means is locked. A member formed in a band shape from a thin metal band or a synthetic resin material having relatively high rigidity. Although the connecting band 132 has flexibility along its own thickness direction, it has elasticity, particularly, its own longitudinal direction. Has little elasticity, and its length does not change even when a tensile force acts in the longitudinal direction. Connection zone 132
Is spirally wound so that one end in the longitudinal direction (that is, the side locked by the locking pin 130) is located radially outward and the other end is located on the center side.

On the other hand, in the webbing take-up device 120,
A cutout 134 is formed in the shaft 48. Notch 13
4 is substantially circular when viewed along the axial direction of the shaft portion 48, and the inner diameter is sufficiently smaller than the outer diameter of the shaft 48. The notch 134 is formed so that its axis is substantially parallel to the axis of the shaft 48, and is displaced with respect to the axis of the shaft 48.
A part of the inner periphery is open at the outer periphery of the shaft portion 48. The notch 134 has a substantially cylindrical locking pin 136.
Is inserted and arranged. The outer diameter of the locking pin 136 is slightly smaller than the inner diameter of the locking pin 136, including the connecting band 132 in a state where the connecting band 132 is wound around the outer circumference by one round, and The outer diameter is notch 13
The width of the connection band 132 is set to be larger than the opening width of the connection band 132 and is formed in a ring shape when viewed along the width direction.
The other end in the longitudinal direction (ie, the end on the center side of the spiral)
The notch 13 is inserted into the inside of the ring
4 is inserted. The connection band 132 inserted into the notch 134 together with the locking pin 136 extends from the opening of the notch 134 to the outside of the notch 134, and the notch 134
By inserting the locking pin 136 having an outer diameter larger than the opening width of the ring portion 138 into the inside of the ring portion 138,
38 is prevented from coming out of the notch 134.

Here, in the webbing take-up device 120, the ring portion 138 is formed with the notch 13 together with the locking pin 136.
The connection band 132 is apparently inserted into the
The connection between any other shaft member and the clutch means according to the present invention according to claim 1 is performed from the clutch means to any other shaft member and from any other shaft member. A state in which motion can be transmitted to the clutch means is connected. For this reason, from this viewpoint, the shaft 4
If the notch 134 around the coil 8 is loosely wound, the notch 1
Since the movement cannot be transmitted until the shaft portion 48 is tightened by the shaft portion 48, the connection in the present invention does not correspond to merely inserting the ring portion 138 into the cutout portion 134 together with the locking pin 136.

Further, in the present webbing take-up device 120, the spiral groove 46 is not formed in the cone spool 44,
Instead, a spiral groove 140 is formed. Spiral groove 140
Similarly to the spiral groove 46, the spiral groove has a width slightly larger than the outer diameter of the cable 38, but the rotation direction of the spiral is opposite to the spiral groove 46. Therefore, in the webbing take-up device 120, the spiral groove 1
When the cone spool 44 is rotated while pulling out the cable 38 wound around the cone spool 44 along the 40 by rotating the cone spool 32, the cone spool 44 is rotated in the rotation direction of the cone spool 32 (that is, the first direction described above). And the rotation direction of the cone spool 44 in the second embodiment), the rotation direction of the cone spool 44 linked to the rotation of the cone spool 32 In the same direction as the rotation of the gear 126 received through the gear. Here, the rotation speed of the gear 126 with respect to the rotation speed of the cone spool 44 interlocked with the cone spool 32 is such that the cable 38 wound around the cone spool 44 is pulled out and almost all of the cable 38 is wound along the spiral groove 36.
2 is larger than the rotation speed of the cone spool 44 with respect to the rotation speed of the cone spool 32 when the outer peripheral portion is wound around the gear 1.
The rotation speed of 26 is set to be slightly lower.

The webbing take-up device 120 includes a spiral coil spring 142 instead of the spiral coil spring 50. Spiral coil spring 142
Similarly to the spiral coil spring 50, the center end of the spiral is fixed to the shaft portion 48 and the outer end of the spiral is fixed to the side wall 14. The opposite is true. That is, as described above, in the webbing take-up device 120, the rotation direction of the cone spool 44 when the cable 38 wound around the cone spool 44 is pulled out by rotating the cone spool 32 is the first and second directions. Since the rotation direction is opposite to the rotation direction of the cone spool 44 of the embodiment,
The spiral coil spring 142 of the present webbing take-up device 120 is formed by reversing the spiral coil spring 142 from the spiral coil spring 50.
Is the same as that of the spiral coil spring 50 in the first and second embodiments.

Further, when the connecting band 132 and the spiral coil spring 142 are viewed along the same direction as the winding direction of the connecting band 132, the spiral coil spring 1
It is set to be in the same direction as 42. The connection band 132 is connected to the cone spool 44 by the connection band 132.
Before rotating one turn relative to the cone spool 44 in the winding direction from the outside to the center side of the connecting band 132 (that is, less than one rotation), the other end side of the connecting band 132 at the other end than the longitudinal middle portion is connected to the shaft portion 48. The length and the number of windings are set so that the portion between the portion where the shaft portion 48 is fastened and the one end side is linear with tension.

<Operation and Effect of Third Embodiment> In the present webbing take-up device 120, the rotation direction of the cone spool 44 interlocked with the rotation of the cone spool 32 via the cable 38 changes the first and second rotation directions. Although different from the embodiment, since the winding direction of the spiral coil spring 142 that urges the shaft portion 48 when the cone spool 44 rotates is opposite to the spiral coil spring 50, the connection of the cable 38 is released. In a state where the spiral coil spring 142 is not pulled out, the shaft portion 48 rotates in a direction in which the spiral coil spring 142 is squeezed by pulling out the webbing belt 24 from the winding shaft 20 (that is, a direction in which the number of turns of the spiral coil spring 142 is increased). Urges the winding shaft 20 to rotate in the direction of winding the webbing belt 24. .

Further, the webbing belt 2 is
4 is pulled out and the cone spool 32 is rotated, so that the gear 122 rotates and meshes with the gear 122.
Although the gear 26 rotates, the gear 126 can rotate relative to the cone spool 44 around the shaft 48, and the rotation direction is the same as the rotation of the cone spool 44 in conjunction with the rotation of the cone spool 32. . Further, the cable 38 wound around the cone spool 44 is pulled out, and almost all of the cable 38 is wound along the spiral groove 36.
2 is larger than the rotation speed of the cone spool 44 with respect to the rotation speed of the cone spool 32 when the outer peripheral portion is wound around the gear 1.
The rotation speed of 26 is slightly lower. Therefore, even if the cone spool 44 rotates until all the wound cables 38 are pulled out, the gear 126 slightly rotates in the direction opposite to the rotation direction of the cone spool 44 relative to the cone spool 44. As a result, the winding of the connection band 132 is slightly loosened (that is, the number of turns of the connection band 132 is reduced). Therefore, the gear 126 connected to the cone spool 44 via the connection band 132 does not hinder the rotation of the cone spool 44.

In the webbing take-up device 120, if the webbing belt 24 is pulled out from the take-up shaft 20, the cable 38 is cut, and the cone spool 32 and the cone spool 44 via the cable 38 are cut.
When the connection state is released, first, the cone spool 44 is biased by the urging force of the spiral coil spring 142.
Rotates. At this time, since the connection state between the cone spool 32 and the cone spool 44 via the cable 38 is released, the cone spool 32 does not rotate, and therefore, the gear that meshes with the gear 122 provided on the cone spool 32 126 does not rotate,
The rotation of the cone spool 44 causes the cone spool 4 to rotate.
4 in a direction opposite to the rotation direction of the cone spool 44.
The gear 126 rotates relative to.

At this time, the rotation direction of the gear 126 relative to the cone spool 44 is substantially the same as the winding direction of the connection band 132 from the outside to the center side. Before the gear 126 makes one rotation, the shaft portion 48 is tightened to a portion on the other end side of the connection belt 132 in the longitudinal direction, and a straight line is formed between the portion where the shaft portion 48 is tightened and one end side. Is applied to the connection band 132. Since the connecting band 132 does not particularly have elasticity along its longitudinal direction, the shaft portion 48 (that is, the cone spool 44) is further removed from the above state.
Is rotated, the locking pin 130 is pulled along the tangential direction to the outer peripheral portion of the shaft portion 48, and the gear 126 is rotated in the same direction as the rotation direction of the cone spool 44. The gear 12 meshed with the gear 126 by the rotation of the gear 126
2, the cone spool 32 rotates, and the gear 26 rotates in conjunction with the rotation of the cone spool 32. For this reason, at this time, if the leading end of the drawn-out webbing belt 24 is free, it is taken up by the winding shaft 20, and if it is not free, the occupant is restrained.

On the other hand, in the webbing take-up device 120, if the webbing belt 24 is wound around the take-up shaft 20, the cable 38 is cut, and the webbing belt 24 is connected to the cone spool 32 and the cone spool 44 via the cable 38. When the webbing belt 24 is pulled out from the winding shaft 20 when the connection state is released, the cone spool 32 rotates and the gear 126 meshing with the gear 122 integrated with the cone spool 32 rotates. Since it has been released, the cone spool 44 does not rotate. At this time, the rotation direction of the gear 126 with respect to the cone spool 44 is substantially the same as the direction in which the connection band 132 is wound outward from the center side of the connection band 132, so that the shaft portion 48 is connected to the connection band 132 before the gear 126 makes one rotation. Is tightened to a portion on the other end side from the middle portion in the longitudinal direction, and a tension is applied to the connection band 132 such that a portion between the portion where the shaft portion 48 is tightened and the one end side is stretched linearly. When the gear 126 is further rotated from this state, the shaft portion 48 becomes a spiral coil spring 142.
(Ie, the spiral coil spring 142)
In the direction of increasing the number of turns). Accordingly, the spiral coil spring 142 urges in the direction opposite to the rotation direction of the shaft portion 48 at this time, and the connection band 132 and the gear 12
6, webbing belt 2 via gear 122 and gear 26
The take-up shaft 20 is urged in the direction in which the 4 is taken up.

As described above, in the present webbing take-up device 120, if the cable 38 is cut or the like, the cone spool 32 and the cone spool 44 via the cable 38 are used.
Even when the connection is released, the urging force of the spiral coil spring 142 can be applied to the webbing belt 24 pulled out from the winding shaft 20.

<Modification of Third Embodiment> In this embodiment, the cone spool 32 is any one of the shaft members according to the first aspect of the present invention, and the cone spool 44 is a second embodiment. Item 1 is the configuration of the other one of the shaft members according to the present invention. However, the cone spool 32 is the other one of the shaft members, and the cone spool 44 is the one of the other shaft members. It is also possible.

That is, instead of the cone spool 32, the gear 122 is provided coaxially and integrally with the other end in the axial direction of the cone spool 44 (that is, the end on the small diameter portion side). The through hole 128 of the gear 126 may be penetrated, and a notch 134 may be formed in the shaft portion 40 to connect the shaft portion 40 and the gear 126 by a connection band 132. In this case, the connection band 132 which is a clutch means is always interlocked with the cone spool 44 via the gear 126, and the connection band 132 is connected to the cone spool 32 until the shaft portion 40 is tightened to the connection band 132.
Is not rotated (that is, the apparent connection band 1
32 is always connected to the shaft portion 40, but when the state in which motion can be transmitted is viewed as connection, the shaft portion 40 is connected to the connection band 132.
The connection band 132 is not connected to the shaft portion 40 until the connection portion 132 is tightened.

In this embodiment, the spiral groove 140 is formed in the cone spool 44.
When one or an odd number of external gears are arranged between the gear 26 and the gear 122, the cone spool 44 in which the spiral groove 46 is formed can be applied, and the spiral coil spring 50 is used instead of the spiral coil spring 142. it can.

[0085]

As described above, according to the present invention, the urging force can be reliably applied to the webbing belt even if a problem occurs in the transmission means such that the connection by the connecting member is inadvertently released. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a main part of a webbing take-up device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a back surface of a gear 54.

FIG. 3 is a front view of the webbing take-up device according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a configuration of a main part of a webbing take-up device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing the configuration of the back surface of the gear 92.

FIG. 6 is an exploded perspective view showing a configuration of a main part of a webbing take-up device according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of a back surface of the gear 126.

[Explanation of symbols]

Reference Signs List 10 webbing take-up device 20 take-up shaft 30 transmission (transmission means) 32 cone spool (shaft member, shaft member on winding shaft side, any one of shaft members) 44 cone spool (shaft member, biasing member side Shaft member, any other shaft member 50 Spiral coil spring (biasing means) 54 Gear (clutch means) 90 Webbing take-up device 92 Gear (clutch means) 94 Planetary gear (clutch means, rotating body) 96 Stopper (clutch) Means, engaging part) 98 Sun gear (clutch means, rotating body) 100 Stopper (clutch means, engaging part) 120 Webbing take-up device 132 Connection band (clutch means) 142 Spiral coil spring (biasing means)

Claims (2)

[Claims] At least one of the outer lengths changes along the axial direction, and one of the outer circumferences rotates about its own axis, and the connection is made. By winding the member around its outer periphery, the other rotates around its own axis and pulls out the connecting member wound around the other, and the amount of rotation of one with respect to the amount of rotation of one with respect to the amount of rotation of the other is changed by changing the length of the outer periphery. A speed change means having a pair of shaft members for shifting, and one end in the longitudinal direction of a long belt-shaped webbing belt for restraining the occupant's body is locked, and is linked with one rotation of the pair of shaft members, and A winding shaft that rotates around an axis of the webbing belt, and the other of the pair of shaft members is disposed around the axis of the shaft member via the connection member and one of the pair of shaft members. Winding direction A biasing means for biasing, a shaft connected to one of the pair of shaft members and a shaft on the biasing means side in a rotating state of only one of the pair of shaft members; A clutch which is connected to one of the other shaft members by rotation of the member at a predetermined angle, and transmits a rotational force of the shaft member on the urging means side to the shaft member on the winding shaft side in a connected state with the other shaft member. Means, and a webbing take-up device comprising: 2. The method according to claim 1, wherein the clutch unit is configured to rotate around a rotation center of one of the pair of shaft members in conjunction with rotation of one of the pair of shaft members. A rotating body that is provided on at least one of the other one of the shaft members and the rotating body, and is engaged with the other one at a predetermined rotation position of the rotating body with respect to the one of the other shaft members. And in the engagement state between the engagement portion and the other shaft member, one of the engagement portion and the engaged side engaged with the engagement is the other. The webbing take-up device according to claim 1, wherein the webbing winding device is pressed around a rotation center of the other one of the shaft members.