JPH04356252A - Driving device for webbing - Google Patents

Abstract

PURPOSE:To provide a webbing driving device capable of adjusting the height at which webbing is installed by means of movement of a webbing locking member together with the webbing without applying loads to a motor, while the webbing is locked to the webbing locking member and worn by passengers. CONSTITUTION:At a clutch portion 46 an electromagnet 48 is affixed to the bottom portion 44A of an outer drum 44 and a lever 50 is rotatably supported between the electromagnet 48 and a worm wheel 38. While a motor 40 is being stopped, electricity is transmitted to the electromagnet 48, and as the motor 40 is driven the electricity is cut off. Therefore when the motor 40 is driven the lever 50 is connected to the worm wheel 38 and driving forces are transmitted to the wheel 38. While the motor 40 is being stopped and webbing 22 is installed, electricity is transmitted to the electromagnet 48 and the lever 50 is separated and disconnected from the worm wheel 38. So even when an adjuster is controlled under that state a wire can be let out without applying loads to the motor 40 and the height at which the webbing is installed is freely adjustable.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a webbing drive device used in an automatic seatbelt device in which the tip of the webbing for restraining an occupant is guided by a guide rail provided on the vehicle body to automatically attach and release the webbing to the occupant. Regarding.

0002

2. Description of the Related Art A so-called automatic seat belt device has been proposed for automatically attaching and releasing webbing to an occupant.

[0003] In this method, one end of the webbing is wound up by a winding device located in the center of the vehicle, and the other end of the webbing is moved in the longitudinal direction of the vehicle along a guide rail located near the roof side of the vehicle. It has a structure in which the webbing is locked to a movable slider and the slider is moved to attach or release the webbing.

In other words, when the slider moves toward the front of the vehicle on the guide rail, a space is created between the intermediate part of the webbing and the seat, and when the passenger sits on the seat, the slider moves toward the rear of the vehicle on the guide rail. You can move to the side and put on the webbing.

[0005] In this case, the slider is connected to a wire arranged along a guide rail, which wire is further connected to a rotating drum of a drive device arranged in the lower part of the side wall of the vehicle. When the drive device is activated, the rotating drum is rotated by the motor to wind up or unwind the wire, and the slider moves accordingly.

[0006] The stop position of the slider corresponding to the position where the webbing is attached by the occupant is detected by a limit switch attached to the adjuster star, and the slider is stopped. This adjuster is locked in a predetermined position on the guide rail.
At the same time as the slider stops, the locking mechanism operates, thereby fixing the webbing to the vehicle body via the slider and adjuster star.

[0007] As described above, the stop position of the webbing, that is, the slider, is determined by the locking position of the adjuster star, so it is necessary to change the locking position of the adjuster star depending on the physique of the different occupants. At this time, when the webbing is attached, that is, when the slider is locked to the adjuster star, the slider must be moved together with the adjuster star.

However, the slider is connected to a wire that moves it, and the wire is further connected to a drive motor. As a result, the slider is prevented from moving, and the webbing mounting position cannot be adjusted in accordance with the physique of the occupant.

[0009]

[Problems to be Solved by the Invention] In consideration of the above-mentioned facts, the present invention aims to prevent the webbing from being attached to the webbing locking member without applying any load to the motor when the webbing is locked to the webbing locking member and attached to the passenger. It is an object of the present invention to provide a webbing drive device that can freely adjust the height of the webbing locking position by moving the webbing.

0010

[Means for Solving the Problems] A webbing drive device according to the present invention automatically attaches and releases an occupant restraining webbing to an occupant, and also provides a webbing fixing position of a webbing fixing member that fixes the webbing to a vehicle body when the webbing is attached. Used in an automatic seat belt device that can adjust the height of the webbing, the cord connected to the webbing is wound up and unwound by a drum connected to a rotational drive shaft, thereby moving the webbing and locking the webbing. A webbing drive device for locking and releasing a member, which is provided between the rotary drive shaft and the drum, and is based on the rotation of the rotary drive shaft when attaching and releasing the webbing to an occupant. When the rotary drive shaft is activated to connect the rotary drive shaft and the drum and transmit the rotation of the rotary drive shaft to the drum, and the webbing is locked to the webbing locking member and the rotary drive shaft is stopped, a rotational force transmitting means that operates based on a rotation stop operation of the rotational drive shaft and disconnects the rotational drive shaft from the drum to interrupt transmission of rotational force between the rotational drive shaft and the drum; It is characterized by the fact that it is equipped with

[0011]

[Operation] In the webbing drive device configured as described above, when moving the webbing in order to attach and release the webbing to the occupant, the rotational force transmission means operates based on the rotation of the rotational drive shaft, and the rotational force transmission means connects the rotational drive shaft and the drum. and the rotation of the rotary drive shaft is transmitted to the drum. This allows the webbing to be automatically unattached.

[0012] When the webbing is locked to the webbing locking member and attached to the passenger, the rotational force transmission means releases the connection between the rotational drive shaft and the drum, and the transmission of rotational force between the two is cut off. Ru.

Therefore, even if the webbing locking member is moved to adjust the webbing attachment position, this moving force is only transmitted to the drum via the cable and not to the rotational drive shaft. Therefore, the rotational drive shaft does not obstruct the movement of the drum, cable, and webbing locking member, and the height of the webbing locking position can be adjusted by moving the webbing locking member together with the webbing without applying any load to the motor. You can do it freely.

[0014]

Embodiment FIG. 1 shows an exploded perspective view of a webbing drive device 10 according to a first embodiment of the present invention, and FIG. 2 shows an automatic seat belt device to which the webbing drive device 10 is applied. It is shown.

A guide rail 14 is arranged on the roof side 12 of the vehicle. The leading end of the guide rail 14 extends along the front pillar 16, and the rear end thereof is bent at a substantially right angle along the center pillar 18. A slider 20 is slidably disposed within the guide rail 14, and one end of a webbing 22 is locked therein. The other end of the webbing 22 is connected to a winding device 24 located in the center of the vehicle.
The material is wound in layers with a predetermined biasing force. This winding device 2
4 has a built-in inertia lock mechanism that instantly stops the webbing 22 from being pulled out in the event of a vehicle emergency.

A wire accommodating groove (not shown) is formed in the guide rail 14, and the wire 26, which is a cable, is tightly accommodated and slidably guided in the longitudinal direction of the guide rail 14. The tip of this wire 26 is attached to the slider 20
The slider 20 moves together with the wire 26. The other end of the wire 26 is connected to a webbing drive device 10 attached to the lower end of the center pillar 18. The wire 26 slides within the guide rail 14 in response to the driving force of the webbing drive device 10, and the slider 20 accordingly moves toward the front or rear of the vehicle.

An adjuster 28 is arranged near the rear end of the guide rail 14 as a webbing locking member. The adjuster 28 can slide on the guide rail 14 within a set range, and can be fixed at any position within the sliding range by operating a knob located outside. Further, the adjuster 28 has a locking mechanism and can be engaged with the slider 20. Therefore, the slider 20 moves along the guide rail 14 at the rear end of the guide rail 14 (i.e., at the adjuster 28).
When the slider 20 is moved to the arrangement position), the slider 20 engages with the adjuster 28 and is fixed to the vehicle body.

As described above, when the slider 20 is moved to the front end of the vehicle of the guide rail 14, a space is created between the webbing 22 and the seat, allowing the occupant to easily sit on the seat. After the occupant is seated, the slider 20 is moved by the webbing drive device 10 to the vehicle rear end of the guide rail 14 and further engaged with the adjuster 28 to be fixed to the vehicle body, allowing the occupant to wear the webbing.

Now, the webbing driving device 10, which is a means for driving the slider 20, ie, the wire 26, will be explained.

As shown in FIGS. 1, 3, and 4, the main body 30 of the webbing drive device 10 is formed into a substantially cylindrical shape with one end open, and the small diameter portion 3 extends from the bottom wall of the large diameter portion 32.
4 is formed to protrude. A shaft 36 is fixed to the center of the bottom wall of the small diameter portion 34 so as to protrude toward the large diameter portion 32 . A worm wheel 38 is disposed within the small diameter portion 34 and is rotatably supported on a shaft 36 via a bush 39 . The worm wheel 38 meshes with a worm gear 42 coaxially attached to the drive shaft of the motor 40, so that the driving force of the motor 40 is transmitted. Furthermore, engagement protrusions 38A are formed at the end of the worm wheel 38 so as to protrude at equal intervals over the entire circumference. An outer drum 44 is disposed within the large diameter portion 32.

The outer drum 44 is formed into a cylindrical shape, and the shaft 36 passes through the center of the inner drum. A clutch portion 46 is disposed between the outer drum 44 and the worm wheel 38.

As shown in FIG. 5, the clutch portion 46 includes an electromagnet 48 and a lever 50. The electromagnet 48 is formed in an annular shape and is fixed to the bottom 44A of the outer drum 44 so as to protrude toward the worm wheel 38. Therefore, the electromagnet 48 is integrated with the outer drum 44. A lever 50 is rotatably supported on the bottom 44A between the electromagnet 48 and the engagement protrusion 38A of the worm wheel 38. The lever 50 is an L-shaped member whose tip 52 is connected to the engagement protrusion 38A of the worm wheel 38.
can be engaged with.

Further, the end corner portion 54 of the lever 50 corresponding to the electromagnet 48 is made of a magnetic material and is adapted to be sensitive to the magnetic force of the electromagnet 48. Lever 50 and outer drum 44
A torsion coil spring 56 is interposed between the lever 50 and the bottom 44A, and biases the tip 52 of the lever 50 in the direction in which it engages with the engagement protrusion 38A of the worm wheel 38, that is, in the axial direction. Therefore, under normal conditions, the lever 50 engages with the worm wheel 38 and the worm wheel 38 and outer drum 44 rotate integrally via the lever 50, but when the electromagnet 48 is energized, its magnetic force causes the worm wheel 38 and the outer drum 44 to rotate together. When the lever 50 rotates against the urging force of the torsion coil spring 56, the engagement between the lever 50 and the worm wheel 38 is released, as shown by the imaginary line in FIG. 5, and the worm wheel 38 and the outer drum 44 rotate relative to each other. It looks like this.

A guide plate 58 is housed inside the outer drum 44. The guide plate 58 is formed into a disk shape, and furthermore, a female threaded portion 58A is formed in the center. This female threaded portion 58A is threadedly engaged with a male threaded portion 36A formed at the intermediate portion of the shaft 36, and can be moved in the axial direction of the shaft 36 by rotation. In this case, the thread pitches of the male threaded portion 36A and the female threaded portion 58A are set so that the guide plate 58 can move in the axial direction by the same amount as the outer diameter of the wire 26 every time it rotates.

Furthermore, the female threaded portion 58 of the guide plate 58
On the outside A, fan-shaped guide holes 60 whose inner circumferential walls are arcuate about the same axis of the guide plate 58 are formed at three locations spaced apart from each other. Into these guide holes 60 are fitted inner drums 62 that are integrally fixed and erected to the bottom portion 44A of the outer drum 44, and the guide plates 58 are rotated via the inner drums 62. There is.

The guide plate 58 has an auxiliary plate 59.
is fixed to the auxiliary plate 59, and the end of the wire 26 is secured to the edge of the auxiliary plate 59 by a holder 64. Therefore, as the guide plate 58 rotates, the wire 26 is guided into the gap between the inner wall of the outer drum 44 and the outer wall of the inner drum 62, and is prevented from being doubled over as the guide plate 58 moves in the axial direction of the shaft 36. It is adapted to be wound around an inner drum 62. Note that the gap between the inner wall of the outer drum 44 and the outer wall of the inner drum 62 is slightly larger than the outer shape of the wire 26, and this also prevents the wire 26 from being wound twice. Furthermore, outer drum 4
The gap between the inner wall of the guide plate 4 and the outer peripheral edge of the guide plate 58 is narrow to prevent the wire 26 from entering between them.

The opening of the main body 30 is covered by a cover 66, thereby sealing the main body 30.

Note that when the slider 20 is located at the vehicle front end of the guide rail 14, the motor 40 operates as follows.
It is activated when the door is closed after the occupant is seated. Furthermore, when the slider 20 is located at the end of the guide rail 14 on the vehicle rear side, the motor 40 is activated when the occupant opens the door. On this occasion,
The drive shaft of the motor 40 is rotated in the opposite direction to the above case. The operation of these motors 40 is stopped when the slider 20 is moved and comes into contact with the vehicle front end or the vehicle rear end of the guide rail 14.

Further, under normal conditions (when the motor 40 is inactive), the electromagnet 48 is always energized, and the energization to the electromagnet 48 is stopped only when the motor 40 is driven.

Next, the operation of this embodiment will be explained. When no passenger is on board, the slider 20 is moved along the guide rail 14.
It is located at the front end of the vehicle. In this state, the guide plate 58 of the webbing drive device 10 is located at the farthest point from the bottom 44A of the outer drum 44, that is, at the cover 6.
It is stopped on the 6th side.

When the occupant takes a seat and closes the door, the motor 40 is activated. When the motor 40 operates, the worm wheel 38 rotates via a worm gear 42 coaxially attached to the drive shaft. Further, at the same time as the motor 40 is activated, power to the electromagnet 48 is stopped. This results in
The tip portion 52 of the lever 50 engages with the engagement protrusion 38A of the worm wheel 38 due to the biasing force of the torsion coil spring 56. Therefore, the rotational force of the worm wheel 38 is applied to the outer drum 44 and the inner drum 62 via the lever 50.
will be transmitted to. Further, in conjunction with this, the guide plate 58 is rotated by receiving the driving force of the motor 40 via the inner drum 62. This allows the wire 26
is guided by the inner wall of the outer drum 44 and the outer wall of the inner drum 62 and wound onto the inner drum 62.

In this case, each time the guide plate 58 is rotated, it moves toward the bottom 44A of the outer drum 44 in accordance with the amount of winding of the wire 26 onto the inner drum 62. The wire 26 is therefore tightly wound in a helical manner.

When the wire 26 is wound onto the inner drum 62 of the webbing drive device 10, the slider 20 connected to the wire 26 is pulled by the wire 26, so that
It is guided by the guide rail 14 and moves toward the rear of the vehicle. Accordingly, the end of the webbing 22 on the slider side also moves accordingly.

This movement of the slider 20 is continued until the slider 20 abuts the end of the guide rail 14 on the rear side of the vehicle. That is, when the slider 20 reaches the end of the guide rail 14, the operation of the motor 40 is stopped, and the slider 20 is further engaged with the adjuster 28 and fixed to the vehicle body. As a result, the webbing 22 is placed between the slider 20 and the take-up device 24 and positioned on the chest of the occupant.

In this state, the occupant can adjust the optimal mounting position of the webbing 22 according to his/her physique by sliding the adjuster 28.

That is, when the operation of the motor 40 is stopped and the slider 20 is engaged with the adjuster 28 and fixed to the vehicle body, the electromagnet 48 in the webbing drive device 10 is energized. As a result, magnetic force is generated in the electromagnet 48 and the lever 50
The tip end corner 54 of is pulled against the biasing force of the torsion coil spring 56 and rotates in the direction of arrow A in FIG. Therefore, the engagement between the tip portion 52 and the engagement protrusion 38A is released, and the outer drum 44 and the worm wheel 38 can rotate relative to each other. Therefore, the outer drum 44 can rotate relative to the motor 40, and the wire 26 wound around the inner drum 62 can be freely unwound without applying a load to the motor 40. Therefore, the adjuster 28 can be slid on the guide rail 14 and can be adjusted according to the physique of the occupant.

Even after the adjustment is completed, the electromagnet 48 continues to be energized. Therefore, the distal end portion 52 of the lever 50 is maintained apart from the engagement protrusion 38A of the worm wheel 38 by the magnetic force of the electromagnet 48. Therefore, the outer drum 44 and the worm wheel 38, that is, the motor 4
0 is maintained in a disconnected state.

When the passenger opens the door to exit the vehicle, motor 4
0 is activated. In this case, the drive shaft of the motor 40 is rotated in the opposite direction to that when the passenger rides the vehicle. Simultaneously with the operation of the motor 40, the energization to the electromagnet 48 is stopped again, and the biasing force of the torsion coil spring 56 causes the lever 5 to 5.
The tip 52 of 0 is the engagement protrusion 38 of the worm wheel 38
A, the worm wheel 38 and the outer drum 44
are integrally connected via a lever 50. Therefore, the rotational force of the motor 40 is transmitted to the outer drum 4 through these.
4. The signal is transmitted to the inner drum 62 and further to the guide plate 58. Therefore, the wire 26 that has been wound around the inner drum 62 is again guided by the inner wall of the outer drum 44 and the outer wall of the inner drum 62 and is unwound. Furthermore, since the guide plate 58 moves toward the cover 66 in accordance with the amount of unwinding of the wire 26, the wire 26 is unwound while being maintained in a tightly wound state.

When the wire 26 is unwound from the inner drum 62 of the webbing drive device 10, the slider 20 connected to the wire 26 is pushed by the wire 26 and moves toward the front of the vehicle along the guide rail 14. Accordingly, the end of the webbing 22 on the slider side also moves accordingly.

This movement of the slider 20 is continued until the slider 20 abuts the end of the guide rail 14 on the vehicle front side. That is, when the slider 20 reaches the end of the guide rail 14, the operation of the motor 40 is stopped, and the webbing 22 is thereby released from the attached state and returned to the state completely separated from the passenger, and is placed in a waiting state for the next webbing 22 to be attached. Become.

As described above, in this embodiment, when adjusting the mounting position of the webbing 22 according to the physique of the occupant using the adjuster 28, the electromagnet 48 is moved based on the operation of the motor 40, that is, when the motor 40 is stopped. Since the wire 26 is disconnected from the motor 40 by being energized, the adjuster 28 can be freely moved without applying a load to the motor 40.
Adjustments can be made by sliding.

Next, another embodiment of the present invention will be described. Components that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment, and their explanations are omitted.

A second embodiment of the invention is shown in FIGS. 6 and 7. Small diameter portion 34 of webbing drive device 70
Inside, a worm wheel 72 is rotatably supported on the shaft 36 via the bush 39. This worm wheel 72 meshes with a worm gear 42 coaxially attached to the drive shaft of the motor 40.
The driving force is transmitted.

A cantilevered arm portion 74 is formed by a notch at the tip of the worm wheel 72 . The arm portion 74 is elastically deformed and movable in the radial direction of the worm wheel 72. A tip corner portion 76 inside the tip of the arm portion 74 is formed of a magnetic material. Furthermore, an L-shaped engaging claw 78 is formed at the tip of the arm portion 74 and projects outward.

A protrusion 80 protrudes from the bottom 44A of the outer drum 44 toward the worm wheel 72, and an engagement groove 81 is continuously formed on the inner circumference of the protrusion 80. Normally, the engagement claw 78 of the worm wheel 72 engages with the engagement groove 81 to transmit the rotation of the worm wheel 72.

An electromagnet 82 is arranged inside the tip of the worm wheel 72 so as to correspond to the corner 76 of the tip. The electromagnet 82 is energized in the same manner as in the first embodiment.
The electromagnet 82 is always energized during normal operation (when the motor 40 is not operating), and the energization is stopped only when the motor 40 is to be driven. Therefore, under normal conditions, the arm part 74 is elastically deformed by the magnetic force of the electromagnet 82, and the engagement claw 78 comes out of the protrusion part 80 as shown by the imaginary line in FIG. The engaging pawl 78 engages with the protrusion 80 at the same time as the motor 40 is driven, and the worm wheel 7 rotates relative to the worm wheel 72.
2 and the outer drum 44 are configured to rotate integrally.

Also in this embodiment, the occupant can adjust the optimal mounting position of the webbing 22 by sliding the adjuster 28.

That is, when the operation of the motor 40 is stopped and the slider 20 is engaged with the adjuster 28 and fixed to the vehicle body, at the same time, the electromagnet 82 is energized and a magnetic force is generated. The corner portion 76 is pulled together, and the arm portion 74 is elastically deformed and moved in the axial direction of the worm wheel 72. Therefore, the engaging claw 78 is disengaged from the protrusion 80, and the outer drum 44 and the worm wheel 72 begin to rotate relative to each other. Therefore motor 4
The wire 26 can be unwound and the position of the adjuster 28 can be adjusted without applying any load to the wire.

A third embodiment of the present invention is shown in FIGS. 8 to 12. Small diameter portion 3 of webbing drive device 90
A worm wheel 92 is rotatably disposed within the worm wheel 4 . A pair of wedge-shaped engagement grooves 94 are formed on the outer periphery of the tip of the worm wheel 92 so as to face each other. Further, a recess 96 is formed in the bottom portion 44A of the outer drum 44 at a position corresponding to the engagement groove 94. A piece 98 is fitted into this recess 96 via a compression coil spring 100.

The tip end 98A of the piece 98 is tapered into a wedge shape, and fits into the engagement groove 9 of the worm wheel 92.
When 4 are in opposing positions, compression coil spring 10
The tip end 98A is pressed by a biasing force of 0 and engages the engagement groove 94.
It is designed to fit inside. In this state, the tip 98
A partially protrudes from the axial end of the worm wheel 92. In this case, the length of the piece 98 is set such that the rear end 98B of the piece 98 is still located within the recess 96. Therefore, when the tip end 98A of the piece 98 is fitted into the engagement groove 94, the outer drum 44
The worm wheel 92 and the worm wheel 92 are configured to rotate together through a piece 98.

[0051] Worm wheel 92 and outer drum 44
A disc-shaped release plate 102 is disposed between the worm wheel 92 and the worm wheel 92 so as to be pivotally supported by a shaft portion 103 that passes through the axis of the worm wheel 92 and is rotatable relative to the worm wheel 92 . Therefore, the release plate 102 is attached to the worm wheel 9.
It is also possible to rotate relative to 2. This release plate 102 is formed so that its outer diameter is slightly smaller than the outer diameter of the worm wheel 92. Furthermore, the engagement groove 9 of the worm wheel 92 is provided on the outer periphery of the release plate 102.
4 and a release groove 1 having the same shape as the engagement groove 94.
04 are formed opposite to each other to form a worm wheel 92.
A portion of the distal end portion 98A protruding from the axial end thereof can be inserted therein. When the piece 98 is fitted into the engagement groove 94, the tip 98A is also fitted into the release groove 104, and when the driving force of the motor 40 is transmitted to the worm wheel 92, the release plate 102 is inserted into the worm wheel 92. It rotates integrally with the Furthermore, when rotational force is transmitted only to the release plate 102 from another drive source, which will be described later, the side wall of the release groove 104 is
8, the piece 98 is pressed and moved in the direction of the recess 96 against the biasing force of the compression coil spring 100, as shown in FIG. When the outer drum 44 is rotated in this state, the tip end 98A of the piece 98 is completely disengaged from the engagement groove 94 as shown in FIG. become.

A pair of substantially fan-shaped through holes 106 are bored in the middle portion of the release plate 102. As shown in FIG. One end of a tension coil spring 108 is locked near one end edge of the through hole 106 . The other end of the tension coil spring 108 passes through the through hole 106 and is then locked to the worm wheel 92 . Further, from the worm wheel 92, there is a through hole 10.
A stopper pin 109 protrudes into the hole 6, and a corner portion of one end of the through hole 106 is in contact with the stopper pin 109. Therefore, the release plate 102 is rotatable relative to the worm wheel 92 only in a direction that resists the biasing force of the tension coil spring 108 (in the direction of arrow A in FIG. 9). The tension coil spring 108 is installed with the release groove 104 of the release plate 102 overlapping the engagement groove 94 of the worm wheel 92, and is engaged only when the release plate 102 rotates relative to the worm wheel 92. A biasing force is exerted in the direction in which the groove 94 and the release groove 104 overlap.

A substantially disk-shaped gear plate 110 is fixed to the rear end of the shaft portion 103 (on the opposite side from the outer drum 44). Therefore, the gear plate 110 rotates integrally with the release plate 102 via the shaft portion 103. As shown in FIG. 10, serrated teeth 112 are formed on the outer periphery of the gear plate 110. Further, a solenoid 114 is disposed on the main body 30 near the gear plate 110 so as to be able to engage with the teeth 112 . When this solenoid 114 is energized, a rod 116 protrudes in the axial direction. Therefore, solenoid 1
14 is energized and activated, the rod 116 is pressed to rotate the gear plate 110 by one tooth of the tooth portion 112.

Further, the solenoid 114 is energized when the operation of the motor 40 is stopped (when the motor 40 is inactive), and the rod 116 protrudes to disengage the piece 98 from the engagement groove 94 and drive the motor 40. The configuration is such that power supply is stopped only when

Next, the operation of this embodiment will be explained. motor 4
When the operation of solenoid 1 is stopped and the slider 20 engages with the adjuster 28 and is fixed to the vehicle body, at the same time, solenoid 1
14 is energized and the rod 116 slides. Therefore, the tooth portion 112 of the gear plate 110 is pressed by the rod 116, causing the gear plate 110 to rotate. Therefore, the release plate 102, which is integrated with the gear plate 110 via the shaft portion 103, rotates against the biasing force of the tension coil spring 108. When the release plate 102 rotates, the side wall of the release groove 104 comes into contact with the tip 98A of the piece 98, and as shown in FIG. 11, the piece 98 is pushed and moved in the direction of the recess 96 against the urging force of the compression coil spring 100. .

When the rider moves the adjuster 28 in this state, the outer drum 44 is rotated by the wire 26 connected to the adjuster 28, and the piece 9 is moved as shown in FIG.
The distal end portion 98A of No. 8 comes to be completely separated from the engagement groove 94. Therefore, the outer drum 44 and the worm wheel 92 can rotate relative to each other, and the wire 26 can be unwound and the position of the adjuster 28 can be adjusted without applying a load to the motor 40.

When the adjustment of the mounting position of the webbing 22 is completed and the adjuster 28 is locked, the energization to the solenoid 114 is stopped, and the rod 116 is thereby moved to its original position. Therefore, the release plate 102 is rotated in the opposite direction by the biasing force of the tension coil spring 108, and stops at a position where the engagement groove 94 and the release groove 104 overlap again. Further, when the outer drum 44 or the worm wheel 92 is slightly rotated manually or by motor driving force, the piece 98 is fitted into the engagement groove 94 again, and the worm wheel 92 and the outer drum 44 can be rotated integrally, and the motor 40 is driven. Be able to transmit power.

A fourth embodiment of the present invention is shown in FIGS. 13 and 14. A worm wheel 122 is rotatably disposed within the small diameter portion 34 of the webbing drive device 120. A pair of solenoids 124 are arranged on the outer periphery of the tip of the worm wheel 122 at positions facing each other and are connected to a vehicle power source via sliding contacts (not shown). The solenoid 124 has a rod 126, and normally this rod 126 protrudes outward in the radial direction of the worm wheel 122, but when energized, the rod 126 moves in the axial direction and retracts. It's starting to look like this.

The solenoid 124 is configured to be energized when the motor 40 is not operating, and to be de-energized only when the motor 40 is driven, as in the previous embodiment.

In addition, as shown in FIG. 14, the outer drum 4
A ring-shaped protrusion 128 is formed protruding from the bottom 44A of 4, and a rod 12 is formed on the inner periphery of the protrusion 128.
A plurality of recesses 130 that can be engaged with 6 are formed at regular intervals. Normally, a rod 126 is fitted into this recess 130, so that the outer drum 44 rotates integrally with the worm wheel 122.

Also in this embodiment, when the operation of the motor 40 is stopped and the slider 20 is engaged with the adjuster 28 and fixed to the vehicle body, the solenoid 124 is activated and the rod 1 is
26 comes out of the recess 130 and the engagement is released, thereby allowing the outer drum 44 and the worm wheel 122 to rotate relative to each other. Therefore, the wire 26 can be unwound and the position of the adjuster 28 can be adjusted without applying any load to the motor 40.

In this fourth embodiment, the rod 126 of the solenoid 124 is operated normally (that is, when the motor 40
It may be configured such that it is in a retracted state when the motor 40 is not in operation, and when the motor 40 is driven, it is energized and protrudes outward. Even in this case, the adjuster 28 can be adjusted without applying a load to the motor 40.

FIG. 15 shows a fifth embodiment of the present invention. A worm wheel 142 is disposed within the small diameter portion 34 of the webbing drive device 140 so as to be rotatable and slidable in the axial direction of the shaft 36 . At the tip of the worm wheel 142 is a ring-shaped magnetic plate 144.
are integrally fixed. Also, outer drum 4
A ring-shaped electromagnet 146 is integrally fixed to the bottom portion 44A of 4. The outer diameter of this electromagnet 146 is approximately equal to the inner diameter of the plate 144,
It can be fitted into the plate 144. Further, the electromagnet 146 is energized in conjunction with the activation signal of the motor 40. That is, it is energized at the same time as the motor 40 is driven (in other words, it is energized only when the motor 40 operates).

A compression coil spring 148 is disposed between the plate 144 and the bottom 44A, and biases the plate 144 and the worm wheel 142 in a direction away from the bottom 44A, that is, the electromagnet 146.

When the electromagnet 146 is energized, the electromagnet 146
The magnetic force of the plate 144 and the worm wheel 1
42 slides against the biasing force of the compression coil spring 148, and the electromagnet 146 comes to fit within the plate 144. Therefore, the outer drum 44 can rotate integrally with the worm wheel 142.

In this embodiment, the outer drum 44 and the worm wheel 142 are capable of relative rotation during normal operation, that is, when the motor 40 is inactive. Therefore, the position of the adjuster 28 can be adjusted by unwinding the wire 26 without applying any load to the motor 40, and the webbing 22 can be moved without any loss of time. Furthermore, when the motor 40 operates, the electromagnet 146 is energized, the plate 144 and the electromagnet 146 engage, and the rotational force of the worm wheel 142 can be transmitted to the outer drum 44, thereby automatically moving the webbing 22.

FIG. 16 shows a sixth embodiment of the present invention. A worm wheel 152 is disposed within the small diameter portion 34 of the drive device 150 so as to be rotatable and slidable in the axial direction of the shaft 36 . A solenoid 154 is arranged between the rear end of the worm wheel 152 and the main body 30. The solenoid 154 has a rod 156, and when energized, the rod 156 protrudes and can press the worm wheel 152 toward the outer drum 44. This solenoid 154 is similar to the fifth embodiment,
It is designed to be energized in conjunction with the activation signal of the motor 40.

[0068] An engagement protrusion 158 is formed on the bottom portion 44A of the outer drum 44 so as to protrude toward the worm wheel 152. A compression coil spring 160 is arranged between the bottom portion 44A and the worm wheel 152, and the worm wheel 152 is connected to the solenoid 154.
It is biased in the direction.

When the solenoid 154 is energized, the rod 1
56 presses the worm wheel 152 and moves it against the urging force of the compression coil spring 160. As a result, the tip of the worm wheel 152 engages with the engagement protrusion 158 of the outer drum 44, and the friction force causes the outer drum 4 to
4 can rotate integrally with the worm wheel 152.

In this embodiment as well, as in the fifth embodiment, the wire 26 can be unwound without applying any load to the motor 40 under normal conditions, that is, when the motor 40 is inactive, and without any time loss. The webbing 22 can be moved.

In this embodiment, if the piece 162 and the bearing 164 are arranged between the rod 156 of the solenoid 154 and the worm wheel 152 as shown in FIG. 17, the frictional resistance between the worm wheel 152 and the rod 156 will be reduced. The worm wheel 152 can rotate smoothly. Furthermore, the tips of the engagement protrusion 158 and the worm wheel 152 may be flat or have uneven surfaces that can be engaged with each other. In this case, the rotational force of the worm wheel 152 can be transmitted to the outer drum 44 more reliably. become.

A seventh embodiment of the present invention is shown in FIGS. 18 and 19. A worm wheel 172 is rotatably disposed within the small diameter portion 34 of the webbing drive device 170. A first small diameter portion 172A and a second small diameter portion 172B are formed at the tip of the worm wheel 172, the diameters of which are successively smaller. A ring-shaped electromagnet 174 is fixed to the first small diameter portion 172A. This electromagnet 174 is configured to be energized when the motor 40 is not operating, and to be de-energized only when the motor 40 is driven.

A pair of slide grooves 175 are formed in the axial direction of the second small diameter portion 172B, and a clutch ring 176 is further disposed therein. clutch ring 176
is a substantially ring-shaped magnetic body, and a pair of guide protrusions 177 are formed to protrude inward. This guide protrusion 17
7 fits into the slide groove 175 and the clutch ring 17
6 can slide in the axial direction of the second small diameter section 172B, and at the same time, the clutch ring 176 and the second small diameter section 172B, that is, the worm wheel 172, are designed to rotate integrally.

Furthermore, convex portions 178 are formed at the end of the clutch ring 176 on the outer drum 44 side so as to protrude at equal intervals over the entire circumference.

A compression coil spring 180 is disposed between the electromagnet 174 and the clutch ring 176. Therefore, the clutch ring 176 is always biased in a direction away from the electromagnet 174 (towards the outer drum 44).

[0076] An engagement protrusion 182 is formed on the bottom portion 44A of the outer drum 44 so as to protrude toward the worm wheel 172. A protrusion 17 is provided at the tip of the engagement protrusion 182.
A recess 184 of a size corresponding to 8 is formed and can be engaged with the protrusion 178. Therefore, under normal conditions, the convex portion 178 and the concave portion 184 are fitted together under the pressure of the compression coil spring 180 so that the outer drum 44 and the worm wheel 172 rotate together, but when the electromagnet 174 is energized. The clutch ring 176 is pulled together and moves against the biasing force of the compression coil spring 180, and the engagement between the convex portion 178 and the concave portion 184 is released, allowing the outer drum 44 and the worm wheel 172 to rotate relative to each other. .

In this embodiment as well, the convex portion 178 is normally
Although the outer drum 44 and the worm wheel 172 rotate integrally due to the fitting between the outer drum 44 and the recess 184, the motor 4
When the operation of the slider 20 is stopped and the slider 20 is engaged with the adjuster 28 and fixed to the vehicle body, the electromagnet 174 is activated and the engagement between the convex portion 178 and the concave portion 184 is released, and the outer drum 44 and the worm wheel 172 are disengaged. Allows relative rotation. Therefore, the wire 26 can be unwound by operating the adjuster 28 without applying any load to the motor 40.

An eighth embodiment of the present invention is shown in FIGS. 20 and 21. A worm wheel 192 is rotatably disposed within the small diameter portion 34 of the webbing drive device 190. A right lever 194 and a left lever 196 are rotatably supported on the front end surface of the worm wheel 192. The right lever 194 and the left lever 196 are substantially rectangular inertial mass bodies whose rear ends are pivotally supported near the periphery of the front end surface of the worm wheel 192 . Therefore, the tip of each lever moves in the direction of approaching and separating from the axis of the worm wheel 192 (
In other words, it can rotate in the radial direction of the worm wheel 192).

The right lever 194 and the left lever 196 are arranged in two sets, facing each other. The tip of each lever has a tapered shape with only one corner being cut out to form a notch 194A and a notch 196A. Further, the notch portion 194A and the notch portion 196A of each of the left and right levers are formed to face each other.

One end of a tension coil spring 198 is locked near the notch 194A and the notch 196A. The other end of the tension coil spring 198 is fixed near the axis of the worm wheel 192. Therefore, under normal conditions, that is, when the worm wheel 192 does not rotate, each lever is connected to the notch 194A and the notch 196A.
The surface on the forming side is biased in the direction toward the axis of the worm wheel 192, so that each tip is located near the axis of the worm wheel 192, and the outer drum 44 and the worm wheel 1
It can be rotated relative to 92. On the other hand, when the worm wheel 192 rotates, centrifugal force is generated in each lever as an inertial mass body, and the notch 194A and the notch 196A are separated from the axis of the worm wheel 192, as shown by the imaginary line in FIG. It moves in the direction of protruding from the periphery.

A protrusion 200 is formed on the bottom 44A of the outer drum 44 to protrude toward the worm wheel 192, and a recess 2 is formed on the inner periphery of the protrusion 200.
02 are formed continuously. This recess 202 can be engaged when the notch 194A and the notch 196A of each lever protrude from the periphery of the worm wheel 192 due to centrifugal force. In this case, as the worm wheel 192 rotates, both the right lever 194 and the left lever 196 move toward the recess 202, but only the notch of the lever that has a notch on the same side as the rotation direction of the worm wheel 192 moves toward the recess 202. The notch of the opposing lever does not engage with the recess 202, but only the side surface opposite to the notch abuts against the recess 202. Therefore, in either left or right rotation of the worm wheel 192, only two levers out of a total of four levers in one pair are connected to the recess 20.
2 so that the rotational force of the worm wheel 192 can be transmitted to the outer drum 44.

In this embodiment, when the motor 40 is inactive, the right lever 194 and the left lever 196 are always activated.
is located near the axis of the worm wheel 192 by the tension coil spring 198 and is spaced apart from the recess 202. Therefore, the outer drum 44 and the worm wheel 192 can rotate relative to each other, and no load can be applied to the motor 40. The wire 26 can be unwound without any time loss, and the webbing 22 can be moved without any time loss.

When operating the motor 40 to move the webbing 22 via the wire 26 and slider 20,
As the worm wheel 192 rotates, the right lever 19
4 or the left lever 196 engages with the recess 202 to control the rotation of the worm wheel 192.
The webbing 22 is automatically
can be moved.

[0084] In this embodiment, the right lever 19
4 and the left lever 196 are rotatably supported, and the other end is rotatably supported; however, the present invention is not limited to this, and as shown in FIG. It may also be configured such that one end of the coil spring 198 is locked to the rear end of the lever 204 and the lever 204 is arranged so as to be slidable in its axial direction. In this case, there is no need to provide a notch at the tip of the lever 204, and as the worm wheel 192 rotates, it moves outward in the radial direction of the worm wheel 192 and fits into the recess 202. This allows the rotational force of the worm wheel 192 to be transmitted to the outer drum 44.

The webbing drive device according to the present invention is not limited to the one having the rotational force transmission means described above, but may have other rotational force transmission means.

[0086]

As explained above, in the webbing drive device according to the present invention, there is a mechanism between the rotary drive shaft and the drum that operates based on the rotation of the rotary drive shaft when attaching and releasing the webbing to the passenger. When the rotation of the rotary drive shaft is transmitted to the drum and the webbing is locked by the webbing locking member and the rotary drive shaft is stopped, the rotation of the rotary drive shaft is actuated based on the rotation stop operation of the rotary drive shaft, and the rotation of the rotary drive shaft and the drum are stopped. Since it is equipped with a rotational force transmission means that interrupts the transmission of rotational force between This has an excellent effect in that the height of the webbing locking position can be freely adjusted by moving the locking member.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a webbing drive device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an automatic seat belt to which the webbing drive device of the present invention is applied.

FIG. 3 is a cross-sectional view of the webbing drive device according to the first embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

FIG. 6 is a sectional view showing a second embodiment.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a sectional view showing a third embodiment.

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

FIG. 10 is a sectional view taken along line X--X in FIG. 8;

FIG. 11 is an enlarged cross-sectional view showing a rotated state of the release plate in the third embodiment.

FIG. 12 is an enlarged sectional view showing a state in which the piece in the third embodiment is removed from the engagement groove.

FIG. 13 is a sectional view showing a fourth embodiment.

FIG. 14 is a perspective view showing the bottom of the outer drum in the fourth embodiment.

FIG. 15 is a sectional view showing a fifth embodiment.

FIG. 16 is a sectional view showing a sixth embodiment.

FIG. 17 is a sectional view showing a modification of the sixth embodiment.

FIG. 18 is a sectional view showing a seventh embodiment.

FIG. 19 is an exploded perspective view showing members disposed within the small diameter portion in the seventh embodiment.

FIG. 20 is a sectional view showing an eighth embodiment.

FIG. 21 is a sectional view taken along the line XXI-XXI in FIG. 20;

FIG. 22 is a sectional view showing a modification of the eighth embodiment.

[Explanation of symbols]

10 Webbing drive device 38
Worm wheel 44 Outer drum 46 Clutch portion 48 Electromagnet 50 Lever 70 Webbing drive device 72
Worm wheel 74 Arm portion 78 Engagement claw 81 Engagement groove 82 Electromagnet 90 Webbing drive device 92
Worm wheel 94 Engagement groove 96 Recess 98 Piece 102 Release plate 114 Solenoid 120 Webbing drive device 122
Worm wheel 124 Solenoid 130 Recess 140 Webbing drive device 142
Worm wheel 144 Plate 146 Electromagnet 150 Webbing drive device 152
Worm wheel 154 Solenoid 170 Webbing drive device 172
Worm wheel 174 Electromagnet 176 Clutch ring 178 Recess 184 Recess 190 Webbing drive device 192
Worm wheel 194 Right lever 196 Left lever 202 Recess

Claims (1)

[Claims] 1. An automatic seatbelt device that automatically attaches and releases occupant restraint webbing to an occupant and adjusts the height of the webbing anchoring position of a webbing anchoring member that locks the webbing to the vehicle body when the webbing is attached. A webbing drive device that is used for winding and unwinding a rope connected to a webbing by a drum connected to a rotational drive shaft, thereby moving the webbing to lock and release the webbing from the webbing locking member. , is provided between the rotary drive shaft and the drum, and operates based on the rotation of the rotary drive shaft when attaching and releasing the webbing to the occupant, and connects the rotary drive shaft and the drum. transmits the rotation of the rotary drive shaft to the drum, and when the webbing is locked to the webbing locking member and the rotary drive shaft is stopped, the rotary drive shaft operates based on the rotation stopping operation of the rotary drive shaft. A webbing drive device comprising a rotational force transmitting means for disconnecting the rotational drive shaft and the drum to interrupt transmission of rotational force between the rotational drive shaft and the drum.