JPH0537727Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a webbing intermediate portion drive device that can drive the webbing intermediate portion toward the passenger attachment portion as required.

[Background Art] An automatic belt device has been proposed that can automatically make a passenger wear webbing after the passenger puts it on.

In this automatic belt device, the end of the webbing is guided to a rail laid on the side of the vehicle so that it can move in the longitudinal direction of the vehicle. When the occupant is seated, the end of the webbing moves toward the rear of the vehicle and is automatically attached to the occupant. Also,
In this belt device, when the occupant exits the vehicle, the end of the belt moves toward the front of the vehicle and the webbing is released.

When attaching or releasing such webbing, there is a possibility that the middle part of the webbing may come into contact with the occupant.
Efforts have been made to increase the rigidity of the ends of the webbing in order to separate the part of the webbing that is attached to the guide rail from the passenger. However, after the webbing is securely attached to the occupant, the rigidity of the rigidity improving portion needs to be reduced in order to ensure the optimal position for attaching the webbing to the occupant, which makes the structure complicated.

Therefore, the present applicant has already proposed that when the webbing moves back and forth when the webbing is attached or removed,
The middle part of the webbing is held between a holding roller and a drive roller, and the middle part of the webbing is forcibly pulled out by rotationally driving the drive roller, and the tension of the webbing is reduced. A webbing intermediate portion drive device that eliminates slack around the webbing take-up shaft and reliably feeds the webbing intermediate portion from the take-up shaft toward the passenger side (Japanese Patent Application No. 1983-53260)
proposed.

In this proposal, the drive roller is driven by a motor, and a driving force is applied to the drive roller to pull out the intermediate portion of the webbing.

If the middle part of the webbing has been pulled out by the maximum amount, it is impossible to pull out the middle part of the webbing any further, so if the motor continues to be energized after that, excessive driving force will be generated.
Damage to the motor may result.

Therefore, it is preferable to protect each part without causing such a situation.

The present invention reduces the webbing tension when the webbing moves in the front-rear direction when attaching and unattaching the webbing, and in reducing the webbing tension, it securely eliminates slack around the webbing take-up axis. To provide a webbing intermediate part drive device which sends out the webbing intermediate part from a take-up shaft toward a passenger side, and prevents a driving force for drawing out the webbing intermediate part from exceeding a predetermined value, thereby ensuring protection of each part. is the purpose.

"Summary and operation of the invention" The webbing intermediate drive device according to the invention is a webbing having one end locked to a winding shaft of a winding device and the other end movably locked along the roof side. and a belt actuator for moving the other end of the webbing in the front-rear direction between a front position and a rear position along the roof side, the webbing intermediate part drive device for an automatic belt device, a detection means for detecting separation of the other end of the webbing from the front position or rear position and arrival at the front position or rear position; and a detection means for detecting the separation of the other end of the webbing from the front position or the rear position, and a rotational torque which directly acts on the webbing and is wound around the winding shaft. a drive means for forcibly pulling out an intermediate portion of the webbing; and when the detection means detects separation of the other end of the webbing from a front position or a rear position, the drive means starts generating rotational torque for operating the drive means; a drive source that stops the generation of rotational torque when the detection means detects that the other end of the webbing reaches the front position or the rear position; The rotating torque limiting means transmits rotational torque to the driving means and causes idle rotation between the driving means and the drive source when a load of a predetermined value or more is applied to the driving means.

According to the above configuration, when the occupant attaches and unattachs the webbing in the automatic belt device, the belt actuator causes the other end of the webbing to move along the roof side in the front-rear direction between the front position and the rear position. will be moved to

When the detection means detects separation of the other end of the webbing from the front position or the rear position, the drive source starts generating rotational torque, and this rotational torque is transmitted to the drive means via the rotational torque limiting means. .

The driving means acts directly on the webbing, and the intermediate portion of the webbing wound around the take-up shaft is forcibly pulled out.

As a result, when the other end of the webbing is moved in the front-rear direction when the webbing is attached or removed, the intermediate portion of the webbing is moved from the take-up shaft toward the passenger, and the webbing tension is temporarily reduced. The webbing, whose tension has been reduced, no longer interferes with the occupant, and the occupant can comfortably attach and detach the webbing.

When the detection means detects that the other end of the webbing reaches the front position or the rear position, the drive source stops generating rotational torque.

As a result, after the webbing is attached, the drive means does not operate, and the winding force of the winding device acts on the webbing, eliminating the drop in webbing tension.As with a normal seatbelt device, the occupant can wear the appropriate webbing. Get device status.

Here, when lowering the webbing tension, the driving means directly acts on the webbing and forcibly pulls out the middle part of the webbing that is wound around the take-up shaft, so that the webbing is rotated around the take-up shaft. There is no risk of loosening, and the intermediate portion of the webbing can be reliably fed out from the take-up shaft toward the passenger side.

Therefore, interference between the webbing and the occupant is reliably eliminated when the webbing is attached or removed, and extremely comfortable operations for attaching or removing the ebbing can be obtained.

In addition, since the webbing does not become loose around the take-up shaft, if the take-up shaft is prevented from rotating in the webbing pulling direction in a vehicle emergency, the webbing will not be pulled out from the take-up shaft, and the webbing will not be pulled out from the take-up shaft. Deterioration in the restraining performance of the webbing for the occupant due to the tightness of the webbing is prevented.

Further, according to the rotational torque limiting means, when a load of more than a predetermined value is applied to the drive means during operation of the drive means, idling occurs between the drive means and the drive source, so that the drive source is The rotational torque transmitted to the drive means is moderately suppressed, and each part is protected. In other words, if the drive source, such as a motor, continues to be energized even after the maximum amount of webbing has been pulled out from the take-up shaft, the rotational torque will increase if left as is. The force limiting means operates, causing the drive source to idle, suppressing the rotational torque to an appropriate level, and protecting each part by preventing the motor from burning out due to excessive rotational torque.

[Embodiment of the invention] FIG. 2 shows a configuration in which the invention is applied to an automatic seat belt device. In this automatic belt device, the webbing 14 is automatically attached to the occupant 12 seated on the seat 10. An anchor plate 15 is attached to one end of the webbing 14, and the anchor plate 15 is guided by a guide rail 20 laid in the longitudinal direction of the vehicle along the roof side 18 of the vehicle body 16, and is movable in the longitudinal direction of the vehicle. ing.

This anchor plate 15 has a guide rail 20
The webbing 14 is moved in the longitudinal direction of the vehicle by a belt actuating device 22 attached to the vehicle, and when moving toward the front of the vehicle, the webbing 14 is separated from the occupant 12, and when moving toward the rear of the vehicle, the webbing 14 is moved as shown in FIG. It is designed so that the passenger 12 can automatically wear it. The configuration of this belt actuating device 22 has already been disclosed in the applicant's earlier application (Utility Model Application No. 55-28552).
issue).

As shown in FIG. 2, when the anchor plate 15 has moved the maximum amount forward of the vehicle along the guide rail 20, the limit switch 23A is activated.
(Normally closed) is open and the limit switch 23B is moved to the rear of the vehicle by the maximum amount.
(normally closed) is becoming open. As shown in FIG. 5, these limit switches 23A, 23B are connected to relays 123A, 1
23B is activated, and each relay 123A is
Contact 223A is closed in ON state, 323A is open, contact 223A is open in OFF state,
323A is closed, relay 123B is ON
In state, contact 223B is closed, 323B is open, in OFF state, contact 223B is open,
323B is closed.

A winding device 26 is attached to the floor 24 approximately at the center of the vehicle on the opposite side of the roof side 18 through the seat 10, and is adapted to wind up and store the other end of the webbing 14.

As shown in FIGS. 1 and 3, in this winding device 26, a pair of side plates 30, 32 protrude from both sides of a base plate 28, and a winding shaft 34 is pivotally supported. The end of the webbing 14 is wound around this winding shaft 34 in a layered manner, and a mainspring spring 36
It is similar to a general winding device in that it winds up the webbing 14 with a winding force of .

A nipping roller 40 and a driving roller 42 are arranged on the side plates 30 and 32 so as to sandwich the middle portion of the webbing 14 therebetween.

As shown in FIG. 3, the nipping roller 40 has a coaxial support shaft 44 passing through the side plates 30, 32, and the neck portion of the sleeve 46, which is rotatably supported near both ends of the support shaft 44, is connected to the housing 47A. , 47B. The housings 47A, 47B are fixed to side plates 30, 32, respectively. Further, the sleeve 46 is biased by the biasing force of the torsion coil spring 50 toward one side of the shaft support hole 48, that is, toward the movement trajectory of the webbing 14.

The shaft support hole 48 is formed in common with a large diameter round hole 52 formed in the side plates 30, 32 on the opposite side of the webbing 14 via the shaft support hole 48.
This round hole 52 is used for inserting the sleeve 46 during assembly, and facilitates the assembly of the sleeve 46 and the holding roller 40.

On the other hand, the drive roller 42 is disposed parallel to the nipping roller 40, and its support shaft 54 projects integrally and passes through the support holes 56 of the housings 57A, 57B. A sleeve 5 similar to the sleeve 46 is attached to the support shaft 54 on both sides of the drive roller 42.
8 is pivotally supported, and the neck portion of this sleeve 58 is inserted into the shaft support hole 56 to restrict movement in the axial direction.

Further, this support shaft 54 is urged in a direction away from the nipping roller 40 by the urging force of a torsion coil spring 60.

However, this support shaft 54 is designed to have a larger movement stroke than the support shaft 44, and therefore the shaft support hole 56 has an elongated hole shape extending in the direction of the webbing 14, with a tip similar to the circular hole 52. Circular hole 62
is formed.

A rotating shaft 64 is supported by the housings 47A and 47B. Cams 66 and 68 are fixed to the rotating shaft 64 and correspond to the sleeves 58 of the support shaft 54. The support shaft 54 and the drive roller 42 are supported by the support holes 54.
6, and the central portion of the webbing 14 is clamped and driven between the drive roller 42 and the clamping roller 40.

For this reason, the cams 66, 68 have a recess 70 formed in a part of their outer periphery, as shown in detail in FIGS. 1 and 3, and the depth of the recess 70 gradually decreases in the circumferential direction of the cam 66, 68. There is.

The gear 72 fixed to the rotating shaft 64 is the intermediate gear 7
3, 74, 75, 76, and a worm gear 79 via a torque limiter 77 serving as rotational torque limiting means. This worm gear 79
is fixed to the output shaft of a motor 80 that rotates in one direction and is a driving source fixed to the housing 47B. Therefore, the rotational torque of the motor 80 is transmitted to the cams 66 and 68 through the respective intermediate gears at a reduced speed, and when the motor 80 rotates, the cams 66 and 68 are driven at low speed in the direction of the arrow A in FIGS. 42
approaches the clamping roller 40 along the shaft support hole 56, and can clamp the intermediate portion of the webbing 14.

In this case, in order to absorb dimensional tolerances, the drive roller 42 has a webbing 14 between it and the nipping roller 40.
Even after the support shaft 44 is clamped, it moves a little further, and this extra movement amount becomes the movement of the support shaft 44 within the support hole 48 .

The rotation angle of the cam 66 is detected by limit switches 79A and 79B attached to the side plate 30.

These limit switches 79A and 79B are of a normally closed type, and are opened when a cam protrusion 66A provided on the cam 66 comes into contact with them, thereby stopping the motor 80 as shown in FIG. Therefore, in the motor 80, the recess 70 of the cam 66 corresponds to the sleeve 58, and the webbing 14
The webbing 14 can be fed out by the rollers 40 and 42 and stopped in the state shown in FIG.

On the other hand, a gear 82 is fixed to the end of the support shaft 54 of the drive roller 42, as shown in FIG. This gear 82 is connected to the gear 78 via the torque limiter 77.
It has come to receive the driving force of Therefore, the support shaft 54 is rotated in the direction of arrow B when the motor 80 rotates, and the middle part of the webbing 14 is moved toward the passenger attachment part of the webbing 14 (in the direction of arrow C) while the webbing 14 is being held between the driving roller 42 and the holding roller 40. It is now possible to send it to

As shown in FIGS. 6 and 7, the torque limiter 77 has a large gear 92 and a small gear 94 rotatably supported on side plate fixed support shafts 96, respectively. An intermediate gear 98 is integrally provided on the large gear 92 that meshes with the worm gear 79, and this intermediate gear 98 meshes with the intermediate gear 76 as shown in FIG. Therefore, this large gear 92 and intermediate gear 9
8 is configured such that when the motor 80 rotates, the rotational force of the motor can always be transmitted as the rotational force of the cams 66 and 68. For this reason, the motor 80 is configured to always stop after rotating by a predetermined angle.

As shown in FIG. 7, a substantially triangular recess 100 is formed from one side of the intermediate gear 98, into which a boss 102 protruding from the small gear 94 is inserted. In this embodiment, the boss 102 has a hexagonal outer shape and corresponds to the three leaf springs 104 disposed within the recess 100. These leaf springs 104 have recesses 1 at both ends in the longitudinal direction.
00 is housed in a leaf spring support groove 106 formed continuously with the leaf spring support groove 106. These three leaf springs 104
is a boss 10 whose longitudinal axis is shown in FIG.
When viewed from the axial direction of the boss 102, it forms a substantially triangular shape, and the intermediate portion of each is close to and parallel to the outer circumferential plane portion of the boss 102.

As a result, the rotational force of the large gear 92 is transferred to the leaf spring 10.
4 is transmitted to the small gear 94 with the boss 102 sandwiched therebetween. When the relative rotational force between the large gear 92 and the small gear 94, that is, the rotational transmission force reaches a predetermined value, the leaf spring 104 is moved by the outer periphery of the boss 102 in a direction in which its longitudinal axis approaches the inner peripheral surface of the recess 100. The leaf springs 104 are elastically deformed to enlarge the facing dimension between the leaf springs 104. For this reason, the boss 102 rotates relative to the leaf spring 104, causing idle rotation. That is, when the reaction force that the drive roller 42 receives from the webbing 14, which receives the driving force from the small gear 94, becomes greater than a predetermined value, the torque limiter 77 idles, thereby preventing the motor 80 from seizing.

Note that a cover plate 108 is attached to the end surface of the intermediate gear 98 with screws 112, and the recess 10 of the leaf spring 104
This prevents it from falling off from 0.

The drive roller 42 shown in FIG.
Even if the gear 82 moves inside the small gear 9,
the shaft support hole 5 so as to maintain the engaged state with 4.
6 is formed in the shape of an arc whose longitudinal axis is coaxial with the small gear 94.

Note that FIG. 5 shows the vehicle power source.

Next, the operation of this embodiment will be explained.

Anchor plate 15 before passenger 12 gets on board
has moved to the vehicle front end of the guide rail 20, and the webbing 14 is between it and the seat 10,
It forms the vehicle space for passengers.

In this state, the limit switch 23A in Fig.
is in an open state because it is in contact with the anchor plate 15, and the limit switch 23B is closed. Also, limit switch 7 in Figure 1
The cam protrusion 66A also contacts the cam projection 9A and opens the opening. Therefore, a circuit 80A constituted by contacts 223A, 223B and a limit switch 79B,
Contacts 223A, 223B, limit switch 79
A circuit 80B configured by A and contact 22
3A, 323B and the circuit 80C constituted by the limit switch 79A are all open, and the motor 80 does not rotate.

For example, when the door is closed after the occupant 12 is seated on the seat 10, the belt actuating device 22 is actuated, and the anchor plate 15 is moved to the guide rail 20.
Since the webbing 14 moves toward the rear of the vehicle along the webbing 14, the occupant 12 can automatically attach the webbing 14.

Furthermore, when the passenger 12 exits the vehicle and opens the door, the belt actuating device 22 moves the anchor plate 15 toward the front of the vehicle along the guide rail 20, so that the passenger 12 automatically moves the webbing 15 toward the front of the vehicle.
4 can be uninstalled.

When the anchor plate 15 comes off the limit switches 23A and 23B when the webbing 14 moves in the longitudinal direction of the vehicle, both limit switches are closed, and the circuit 80 is closed.
A is turned on, the motor 80 is activated, and the webbing 14 near the anchor plate 15 is pushed out in the direction of the anchor plate 15 by the take-up device 26, so the tension of the webbing 14 that is obliquely attached to the occupant 12 is reduced. , anchor plate 15
Interference between the nearby webbing 14 and the occupant 12 is avoided.

To explain this effect in detail, when the occupant 12 releases the webbing 14, that is, when the passenger 12 releases the webbing 14,
Anchor plate 1 from the state shown by the solid line in the figure.
5 is a limit switch 2 that is driven toward the front of the vehicle.
3A and 23B are both closed, the circuit 80A is turned on, the motor 80 rotates, and the intermediate gears 73 to
76 and the cam 66 via the torque limiter 77,
68 is rotated in the direction of arrow A. As a result, the recess 70 immediately rotates to a position where it does not correspond to the sleeve 58, and the outer peripheries of the cams 66 and 68 other than the recess 70 push the sleeve 58, and the driving roller 42 holds the webbing 14 between it and the clamping roller 40. to hold. At the same time, the gear 82 rotated by the torque limiter 77 rotates the drive roller 42 in the direction of arrow B, so that the webbing 14 is rotated by the arrow C.
direction, that is, the passenger mounting section. When this feeding is completed, the protrusion 66A of the cam 66 opens the limit switch 79B, so the circuit 80A is turned off, and the motor 80
stops its rotation, and the webbing 14 is temporarily held in the fed-out state, that is, in a state in which the tension at the passenger attachment portion of the webbing is reduced.

When the middle part of the webbing 14 passes by the side of the occupant 12 and moves to the front of the vehicle by the maximum amount, the anchor plate 15 opens the limit switch 23A, so the circuit 80C is turned on.
When the motor 80 rotates further and the recess 70 again corresponds to the sleeve 58, the limit switch 79A is opened, the circuit 80C is turned off, and the motor 80 is stopped. At the same time, the drive roller 42 separates from the clamping roller 40, so that no force is applied to the middle part of the webbing 14, and the webbing 1
4 is pulled out from the winding shaft 34 and moves as the anchor plate 15 moves forward of the vehicle.

Therefore, when the webbing 14 passes by the side of the occupant 12, it does not come into contact with the shoulders, neck, etc. of the occupant 12.

During the state in which the webbing 14 is being paid out by the motor 80, when the webbing 14 reaches the maximum amount paid out from the take-up shaft 34, the torque limiter 77 is activated. That is, when the webbing 14 is pulled out from the take-up shaft 34 by the maximum amount,
Since it is no longer possible to pull out the webbing 14 any further, a large rotational resistance force is generated in the drive roller 42 that drives the webbing 14. Therefore, torque limiter 77
If it is not attached, there is a possibility that the coil in the motor 80 will burn out. However, in this embodiment, the boss 102 of the torque limiter 77 and the leaf spring 104 rotate relative to each other, and the motor 80 continues to rotate. Therefore, the rotation of this motor 80 is controlled by the worm gear 79, the large gear 92, the intermediate gears 76, 75, 74,
73, when the cam 66 that rotates by receiving the gear 72 reaches a predetermined amount of rotation, the striker 66A activates the limit switch 79A or the limit switch 7.
9B is opened to stop the rotation of the motor 80. As a result, burnout of the motor 80 does not occur.

Note that when the webbing 14 moves in the direction of attachment to the occupant 12, that is, when the anchor plate 15 moves toward the rear of the vehicle in FIG. By performing this operation, interference between the intermediate portion of the webbing 14 and the webbing 12 can be prevented.

However, in this case, the circuit 80A operates in the initial state in which the anchor plate 15 moves, and the circuit 80B operates in the state in which the anchor plate 15 moves the maximum amount toward the rear of the vehicle. However, the operation of cam 66 is similar.

In the above embodiment, a combination of the clamping roller 40 and the driving roller 42 is used to feed the intermediate part of the webbing to the passenger attachment part, but various clamping and driving means can be applied to the present invention. Further, the present invention is not limited to the torque limiter 77 shown in the above embodiments, but can be applied to any torque limiter that idles when a predetermined relative rotational torque is generated.

[Effects of the invention] As explained above, in the webbing intermediate portion drive device according to the present invention, when the other end of the webbing is moved in the front and rear direction when the webbing is attached or unattached, the webbing intermediate portion is moved away from the take-up shaft by the occupant. The webbing tension is temporarily lowered by being moved to the side.
The webbing, whose tension has been reduced, no longer interferes with the occupant, allowing the occupant to comfortably attach and detach the webbing.

In addition, after the webbing is attached, the drive means does not operate, and the retracting force of the retractor acts on the webbing, eliminating the drop in webbing tension, allowing the occupant to properly attach the webbing in the same way as with a normal seat belt device. Get status.

Here, when lowering the webbing tension, the driving means directly acts on the webbing and forcibly pulls out the middle part of the webbing that is wound around the take-up shaft, so that the webbing is rotated around the take-up shaft. There is no risk of loosening, and the intermediate portion of the webbing can be reliably fed out from the take-up shaft toward the passenger side.

Therefore, interference between the webbing and the occupant is reliably eliminated when the webbing is attached or removed, and extremely comfortable operations for attaching or removing the ebbing can be obtained.

In addition, since the webbing does not become loose around the take-up shaft, if the take-up shaft is prevented from rotating in the webbing pulling direction in a vehicle emergency, the webbing will not be pulled out from the take-up shaft, and the webbing will not be pulled out from the take-up shaft. Deterioration in the restraining performance of the webbing for the occupant due to the tightness of the webbing is prevented.

Further, according to the rotational torque limiting means, when a load of more than a predetermined value is applied to the drive means during operation of the drive means, idling occurs between the drive means and the drive source, so that the drive source is The rotational torque transmitted to the drive means is moderately suppressed, and each part is protected. In other words, if the drive source, such as a motor, continues to be energized even after the maximum amount of webbing has been pulled out from the take-up shaft, the rotational torque will increase if left as is. The force limiting means operates, causing the drive source to idle, suppressing the rotational torque to an appropriate level, and protecting each part by preventing the motor from burning out due to excessive rotational torque.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along the line - - of Fig. 3 showing the first embodiment of the present invention, Fig. 2 is a side view of an automatic belt device to which the invention is applied, and Fig. 3 is a - line sectional view of Fig. 1. 4 is a cross-sectional view taken along the - line in FIG. 3, FIG. 5 is a circuit diagram of the first embodiment, FIG. 6 is a sectional view taken along the axis showing the torque limiter, and FIG. 7 is a cross-sectional view taken along the line shown in FIG. 6. It is a diagram. 12... Crew, 14... Webbing, 40...
Gripping roller, 42... Drive roller, 66... Cam, 68... Cam, 77... Torque limiter, 8
0...Motor, 92...Large gear, 94...Small gear, 98...Intermediate gear, 102...Boss, 104
...Plate spring.

Claims (1)

[Scope of utility model registration request] A webbing whose one end is locked to a winding shaft of a winding device and whose other end is locked movably along the roof side, and the other end of the webbing is moved along the roof side to a forward position and a rearward position. A webbing intermediate drive device for an automatic belt device having a belt actuating device for moving the webbing in the front and back direction between positions, the webbing intermediate drive device comprising: a belt actuating device for moving the webbing in the front and back direction between positions, the webbing intermediate drive device comprising a detection means for detecting the arrival of the webbing at the position; a driving means for obtaining rotational torque and directly acting on the webbing to forcibly pull out the intermediate portion of the webbing wound around the take-up shaft; When the separation of the other end from the front position or the rear position is detected, the generation of rotational torque for operating the drive means is started, and the detection means detects that the other end of the webbing reaches the front position or the rear position. a drive source that stops generation of rotational torque when detected, and a drive source that is disposed between the drive means and the drive source and transmits the rotational torque generated by the drive source to the drive means, and also that the drive means is subjected to a load of a predetermined value or more. 1. A webbing intermediate portion drive device comprising: rotational torque limiting means for causing idle rotation between the drive means and the drive source when the webbing is engaged.