JPH0245095Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a webbing winding device for winding up webbing for restraining an occupant for use in a seat belt device for protecting an occupant in a vehicle emergency.

[Background technology]

A webbing retractor is a device that is fixed to a part of the vehicle body and uses a biasing force to wind up the end of the webbing for occupant restraint onto a retracting shaft and store it there. Usually, there is a locking mechanism built into the device to prevent it from coming out.

Webbing retractors having this locking mechanism are broadly classified into automatic locking retractors (ALR) and emergency locking retractors (ELR). The automatic locking type winding device has a structure in which, after pulling out the occupant restraint webbing to a desired length, it automatically locks if it is wound even a little, and cannot be pulled out any further. On the other hand, the emergency lock type retractor uses a weak force to secure the webbing to the occupant's body during normal driving so that the webbing does not impede the occupant's movements, and does not lock the webbing, but when acceleration exceeding a predetermined value is applied, the webbing is locked and the webbing is unwound. It's now designed to prevent it from coming out.

Since these two types of webbing take-up devices have different structures and parts, they have naturally been manufactured separately so far.

[Purpose of invention]

The present invention was devised in view of the above circumstances, and its purpose is to provide a webbing retractor that uses common parts and can be used for both automatic lock type and emergency lock type.

[Structure of the idea]

In order to achieve the above object, the present invention includes a take-up shaft for winding up occupant restraint webbing, a lock member that engages with the take-up shaft and prevents the webbing from rotating in the direction of pulling out the webbing, and a lock member that follows the take-up shaft. a lock ring that rotates and guides the lock member to a take-up shaft rotation inhibiting state when the rotation is stopped; a first state that is separated from the lock ring and allows the lock ring to rotate; and a first state that is engaged with the lock ring and is locked. It is arranged to be movable between a second state in which rotation of the ring is prevented, and is moved from the first state by directly receiving a repulsive force from the lock ring due to the sudden rotation of the lock ring in the direction of pulling out the webbing. a lever that is moved to the second state; and an elastic holding member that is connected to the lever and holds the lever in one of the first state and the second state by elastic force. is connected to the lever and arranged so as to be able to come into contact with the webbing wound around the take-up shaft, and when the webbing is taken up by a predetermined amount or more on the take-up shaft, it comes into contact with the taken-up webbing and the above-mentioned A winding diameter sensing means for forcibly setting the lever to the first state by restricting movement of the lever to the second state is incorporated.

With this configuration, the webbing retractor performs an automatic lock operation, but if a vehicle acceleration sensor is attached near the lock wheel or lever, it can also be used as an emergency lock type retractor.

[Example of idea]

As shown in FIGS. 1 and 2, the webbing retractor 10 according to this embodiment has a frame 12 fixed to a vehicle body 16 with mounting bolts 14.

A pair of leg plates 1 are attached from both sides of the frame 12.
8 and 20 extend parallel to each other, and the vicinity of both ends of the winding shaft 22 are pivotally supported. One end of an occupant restraining webbing 24 is wound in a layer around the center of the winding shaft 22. This webbing 24
The other end (not shown) of the webbing 24 is adapted to allow the occupant to attach the intermediate portion of the webbing 24, which is attached to other parts of the vehicle body via a tongue plate, a buckle device, or the like.

The inner end of a mainspring spring 26 is locked to the end of the winding shaft 22 protruding from the leg plate 20; It is locked to a spring case 28 which is fixed to the spring case 20. The winding shaft 22 is biased in the winding direction of the webbing 24 by the mainspring spring 26.

An internal tooth ratchet foil 30 is provided on the outside of the leg plate 18.
is fixed with multiple rivets. A pair of lock plates 3 as lock members shown in FIGS.
4,36 are compatible.

These lock plates 34 and 36 have a rectangular protrusion 3 in the center that is a radial protrusion of the winding shaft 22.
A recess 40 for receiving the lock plate 8 is provided, so that the overall shape of the lock plates 34, 36 is approximately C-shaped.

A locking pawl 44 is formed on a part of the outer periphery of the pair of locking plates 34, 36, and when the locking plates 34, 36 move in opposite directions, the internal teeth ratch as shown in FIG. 5B. 30 to stop the webbing unwinding rotation of the take-up shaft 22.

A pair of pins 46 protrude from one side of the lock plates 34 and 36, respectively, and are parallel to the winding shaft 22.

A support shaft 48 is disposed coaxially with the rectangular protrusion 38 of the winding shaft 22 so as to rotate integrally with the winding shaft 22. A lock ring 50 is supported relatively rotatably on this support shaft 48, and as shown in FIGS. 5A and 5B, four elongated holes 52 are formed in the lock plate side surface of this lock ring 50. has been done. Pins 46 protruding from the lock plates 34 and 36 are accommodated in these long holes 52, respectively, so that the pair of lock plates 34 and 36 can move in opposite directions by the stroke of the long holes 52.

A torsion coil spring 54 is interposed between the lock ring 50 and the support shaft 48, so that the lock ring 50 is connected to the fifth
In Figures A and B, the winding shaft 22 is biased clockwise. Therefore, the lock ring 50 receives this biasing force and rotates integrally with the winding shaft 22. However, when the lock ring 50 is prevented from rotating, it deflects the torsion coil spring 54 and causes a rotation delay, which causes the lock plates 34 and 36 to move in opposite directions as shown in FIG. 5B. let During this movement, the pins 46 of the lock plates 34, 36 move within the elongated holes 52, and after the movement, each lock pawl 44 engages the internal toothed ratchet wheel 3.
0 to prevent rotation of the take-up shaft 22 in the webbing unwinding direction.

In the so-called normal state where the rotation of the lock ring 50 is not prevented, the pins 46 of the lock plates 34 and 36 come into contact with one end of the elongated hole 52, as shown in FIG. 5A, and a part of the recess 40 comes into contact with the stopper. 40
A is in contact with the rectangular protrusion 38 of the winding shaft.

A disc-shaped rotor 56 is integrally fixed to the support shaft 48, and this rotor 56 prevents the lock ring 50 from coming off the support shaft 48. Ratchet teeth 58 are cut into the outer periphery of the lock ring 50, and a trigger lever 60 corresponds to the ratchet teeth 58.

The trigger lever 60 has a claw portion 62 at the tip, and a torsion coil spring 6 as an elastic holding member at the rear end.
One end of 4 is connected. Torsion coil spring 6
The other end of 4 is connected to the hole 66 on the leg plate 18 (FIGS. 1 and 2).
), therefore, the trigger lever 60 is connected to the second
In the figure, the rear end is biased clockwise and comes into contact with the ratchet teeth 58 of the lock ring 50.

On the other hand, as can be seen from FIG. 3, a winding diameter sensing arm 70 serving as winding diameter sensing means is integrally connected to the trigger lever 60 via a shaft portion 68. The tip of the sensing arm 70 is in contact with the outer surface of the webbing 24 wound around the winding shaft 22, as shown in FIG. Therefore, when the winding diameter of the webbing 24 is greater than or equal to a predetermined value, the sensing arm 70 maintains the trigger lever 60 in the state shown in FIG. When the coil is pulled out and the winding diameter becomes smaller, the above-mentioned effect is canceled.

As can be seen from FIG. 1, the trigger lever 60 has its shaft portion 68 pivotally supported by the hole 72 of the leg plate 18, so that the trigger lever 60, the shaft portion 68, and the winding diameter sensing arm 70 rotate together. ing. Although the turning bias force of the trigger lever 60 by the torsion coil spring 64 is clockwise in FIG. If it exceeds the limit, it will switch counterclockwise. Therefore,
The trigger lever 60 performs a so-called snap operation, and its claw portion 62 engages with the ratchet tooth 58.

After each of the above members is assembled to the winding device 10,
It is covered by a predetermined lever 76.

The webbing retractor constructed as described above performs an automatic locking type (ALR) operation, and the operation sequence is as follows. Figure 2 shows webbing 24
shows a state in which the maximum amount of winding is carried out on the winding shaft 22, and the trigger lever 6 is activated by the winding diameter sensing arm 70.
0 is in a non-engaging position with the locking wheel 50. Therefore, the lock ring 50 is rotatable and the webbing 24 can be pulled out from the take-up shaft 22.

Here, when the occupant on the seat takes out the buckle standing up from the vehicle floor and pulls the tongue plate from the opposite side, the webbing 24 is pulled out from the take-up device 10. Next, when the tongue plate is inserted into the buckle and the webbing is attached, when the webbing 24 is suddenly pulled, the rear end of the trigger lever 60 that is in contact with the lock ring 50 moves counterclockwise (lower side in Figure 2). is pushed down. The connection point 74 between the trigger lever 60 and the torsion coil spring 64 is
When the torsion coil spring 64 is moved downward beyond the line connecting the hole 66 supporting the torsion coil spring 64 and the shaft portion 68 of the trigger lever 60, the biasing force of the torsion coil spring 64 is switched counterclockwise.

Therefore, the trigger lever 60 is snap-actuated and rotated counterclockwise, and the claw portion 60 is rotated as shown in FIG.
2 engages the ratchet teeth 58 of the locking wheel 50. At this time, since a considerable amount of the webbing 24 has been pulled out from the take-up shaft 22, the winding diameter sensing arm 70 has already released the rotation preventing action of the trigger lever 60.

If you try to pull out the webbing 24 from the take-up device 10 in this state, the lock plates 34 and 36 will move against the internal toothed ratch foil 30 as shown in FIG. 5B.
The webbing 24 is prevented from unwinding.

However, as can be seen from the shape of the ratchet teeth 58 of the lock ring 50, the webbing 24 is
Since it is possible to wind the webbing 24 into two, if the webbing 24 is attached to a passenger or luggage, a reliable restraining force can be obtained by the automatic locking action. Winding device 1
To release the webbing unwinding stop of 0, remove the tongue plate from the buckle and remove the webbing 2.
4 may be entirely wound onto the winding shaft 22. When the webbing winding diameter on the winding shaft 22 increases, the winding diameter sensing arm 70 gradually rotates the trigger lever 60 clockwise, causing the pawl 62 to disengage from the ratchet teeth 58. In addition, the trigger lever 60
When turning, if the connecting point 74 moves upward (in the direction toward the lock ring 50) beyond the line connecting the hole 66 and the shaft portion 68, the biasing direction of the torsion coil spring 64 is also switched. Therefore, the claw portion 62 is reliably separated from the ratchet teeth 58, and the trigger lever 60 returns to the state shown in FIG. 2.

Although this embodiment shows a self-locking winder, it is also possible to use the device as an emergency locking winder. In this case, it is sufficient to simply install an acceleration sensor near the trigger lever 60, and there is no need to significantly change the components. An example of the acceleration sensor is an inertial weight.
The inertial weight operates the trigger lever 60 by vibration when the vehicle experiences acceleration of a predetermined value or more, and the trigger lever 60 prevents the lock wheel 50 from rotating. After the rotation of the lock ring 50 is prevented, the lock plates 34 and 36 engage with the internal tooth ratchet foil 30 and webbing 2 as described above.
4 is prevented from unwinding.

In addition, an electrical acceleration sensor or a solenoid may be attached to stop the rotation of the locking wheel 50.

As described above, the webbing retractor of this embodiment can be used as either an automatic lock type or an emergency lock type, and therefore has the advantage of being able to use common parts when manufacturing the webbing retractor.

In the above embodiment, a torsion coil spring 54 (see FIG. 3) is locked to the lock ring 50 so as to rotate following the winding shaft 22, but the torsion coil spring 54 is removed and the lock ring 50 directly on the winding shaft 2
It may be fixed to 2. In this case, the trigger lever 60 can engage with the ratchet teeth 58 to directly lock the winding shaft 22, and not only the torsion coil spring 54 but also the lock plates 34, 36 and the internally toothed ratchet wheel 30 can be omitted. . When attaching webbing, webbing 2 is attached as in the previous example.
4 can be wound in, but unwinding is possible when the claw portion 62 of the trigger lever 60 is connected to the lock ring 50 and the winding shaft 22.
This is prevented by locking the .

A winding device with such a configuration also has a trigger lever 60.
By attaching an acceleration sensor near the winding device, it can be used as an emergency lock type winding device.

[Effect of idea]

As described above, the present invention includes a take-up shaft for winding up occupant restraint webbing, a lock member that engages with the take-up shaft and prevents the webbing from rotating in the webbing pull-out direction, and a lock member that rotates following the take-up shaft. A lock ring guides the lock member to a take-up shaft rotation inhibiting state when rotation is stopped; a first state separates from the lock ring to allow rotation of the lock ring; and a first state that engages with the lock ring to prevent the lock ring from rotating. The webbing is arranged so as to be movable between the first state and a second state in which rotation is prevented, and receives a repulsive force directly from the lock ring due to rapid rotation of the lock ring in the webbing pulling direction, and changes from the first state to the first state. a lever that is moved to the second state; an elastic holding member that is connected to the lever and holds the lever in one of the first state and the second state by elastic force; It is connected to the lever and is arranged so as to be able to come into contact with the webbing wound around the take-up shaft, and when the webbing is wound around the take-up shaft by a predetermined amount or more, the lever comes into contact with the wound webbing and the lever is moved. Since it incorporates a winding diameter sensing means for forcibly setting the lever to the first state by restricting movement to the second state, it can be used in either an automatic lock type winding device or an emergency lock type winding device. can also accommodate
Therefore, there is an effect that parts can be made common.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing a preferred embodiment of the webbing retractor according to the present invention, FIG. 2 is a left side view with the cover and rotor removed, and FIG. 3 is an exploded perspective view of the main parts. FIG. 4 is a left side view showing the automatic locking state, and FIGS. 5A and 5B are partial sectional views showing the locking plate in the operating state. 10... Webbing winding device, 22... Winding shaft, 24... Webbing, 30... Internal tooth ratchet foil, 34, 36... Lock plate, 50
...Lock ring, 58...Ratchet tooth, 60...
Trigger lever, 64... Torsion coil spring, 70
...Reel diameter sensing arm.

Claims (1)

[Claims for Utility Model Registration] A take-up shaft for winding up occupant restraint webbing, a locking member that engages with the take-up shaft and prevents the webbing from rotating in a direction in which the webbing is pulled out, and a lock member that rotates following the take-up shaft. A lock ring that guides the lock member to a state where rotation of the winding shaft is prevented when the winding is stopped; a first state that is separated from the lock ring and allows the lock ring to rotate; and a first state that is engaged with the lock ring to prevent the rotation of the lock ring. The webbing is moved from the first state to the second state by directly receiving a repulsive force from the lock ring due to the rapid rotation of the lock ring in the direction of pulling out the webbing. a lever that is moved to the first state or the second state; an elastic holding member that is connected to the lever and holds the lever in either the first state or the second state by elastic force; and is arranged so as to be able to come into contact with the webbing wound up on the take-up shaft, and when the webbing is wound up on the take-up shaft by more than a predetermined amount, it comes into contact with the taken-up webbing and the lever is A webbing retractor comprising: winding diameter sensing means for forcibly setting the lever to the first state by restricting movement to the second state.