JPH0241091Y2 - - 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 does not lock the webbing by applying a weak force to the occupant's body during normal driving to prevent the webbing from interfering with the occupant's movements, but if acceleration exceeding a predetermined value is applied, the webbing locks and unwinds the webbing. It is designed to prevent

Since these two types of webbing retractors have different structures and parts, they have naturally been manufactured separately up to now.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to create a webbing winder that can be used for both automatic locking type and emergency locking type by using common parts, and that also works reliably in automatic locking type. The objective is to provide a device for removing

[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 rotates following the take-up shaft. a lock ring that guides the lock member to a take-up shaft rotation blocking state when the rotation is stopped; a state that engages with the lock ring to prevent the lock ring from rotating; and a state that is separated from the lock ring to allow the lock ring to rotate. a lever arranged to be movable between the two states; an elastic holding member connected to the lever and holding the lever in one of the two states by elastic force; an acceleration sensing means that detects a sudden withdrawal and rotates in the webbing withdrawal direction to press the lever and move the lever to the locking wheel rotation blocking state against the elastic holding force of the elastic holding member; It is connected to the lever and 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 a predetermined amount or more, the lever comes into contact with the taken-up webbing and the lever is moved. and a winding diameter sensing means for restricting movement to the lock wheel rotation inhibited state and allowing the lock wheel to rotate.

With this configuration, the webbing retractor intentionally pulls out the webbing suddenly and automatically locks, but if a vehicle acceleration sensor is attached near the locking wheel, 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.

From both sides of this frame 12 are a pair of leg plates 1.
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 layers around the center of the winding shaft 22. This webbing 24
The other end (not shown) is attached to other parts of the vehicle body via a tongue plate, buckle device, etc., so that the intermediate portion of the webbing 24 can be attached to the passenger.

The inner end of a mainspring spring 26 is locked to the end of the winding shaft 22 protruding from the leg plate 20, and the outer end of the mainspring spring 26 is locked to a spring case 28 fixed to the leg plate 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 lock pawl 44 is formed on a part of the outer periphery of the pair of lock plates 34, 36, and when the lock plates 34, 36 move in opposite directions, the inner teeth ratch as shown in FIG. 4B. 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. 4A and 4B, 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.

Here, the lock ring 50 has a torsion coil spring 54 interposed between it and the support shaft 48, so that
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. 4B. let During this movement, the pins 46 of the lock plates 34, 36 move within the elongated holes 52, and after the movement, the lock claws 44 engage the internal toothed ratchet foil 30.
The rotation of the take-up shaft 22 in the webbing unwinding direction is prevented.

In addition, 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, and a part of the recess 40 comes into contact with the stopper, as shown in FIG. 4A. 40
A is in contact with the rectangular protrusion 38 of the winding shaft.

A rotor 56 is fixed to the support shaft 48, and the rotor 5
A shaft portion 58 having a slightly smaller diameter than the support shaft 48 coaxially projects from the support shaft 6 . An internally toothed ratchet wheel 60 constituting an acceleration sensing means is fitted into this shaft portion 58, and an arcuate groove 62 is formed in a part of the inner surface of the internal toothed ratchet wheel 60. In the arc groove 62,
Although not shown, a pin or protrusion extending from the leg plate 18 is engaged, thereby allowing the internal toothed ratchet wheel 60 to rotate through the angle permitted by the arcuate groove 62.

An irregularly shaped hollow hole of an actuating ring 64 constituting an acceleration sensing means is inserted into the tip of the shaft portion 58 so that it rotates together with the winding shaft 22. An inertia plate 66 constituting acceleration sensing means is pivotally supported on the leg plate 18 side of the operating ring 64 and is rotatable relative to the winding shaft 22. A pawl 68 constituting acceleration sensing means is pivotally supported on this inertia plate 66 by a pin 70, and this pin 70 is connected to the actuating ring 64.
A long hole 72 formed as a longitudinal direction in the radial direction of
It penetrates inside. A tension coil spring 74 is interposed between the inertia plate 66 and the actuating ring 64, and the inertia plate 66 receives a biasing force in the webbing unwinding direction. The relative positions of the inertia plate 66 and the operating ring 64 as shown in FIG. 2 are in the vehicle normal state, and the pawl 68 is retracted into the inertia plate 66. However, when the actuation ring 64 rapidly rotates in the webbing unwinding direction, the inertia plate 66 bends the tension coil spring 74, causing a rotation delay, and the pin 70 causes the pawl 68 to protrude outside the inertia plate 66. .

The inertia plate 66 is housed in an internally toothed ratchet foil 60 that is rotatably supported on the winding shaft 22, and when the pawl 68 protrudes from the inertial plate 66, it engages with this internally toothed ratchet foil 60 and the internal toothed ratchet foil 60 is disposed. It rotates around the take-up shaft 22 together with the take-up shaft in the webbing unwinding direction.

As shown in FIG. 2, a protrusion 76 is fixed to the lower surface of the internal tooth ratchet foil 60, and one end of a trigger lever 78 abuts on this protrusion 76, and the other end of the trigger lever 78 is pivotally supported by the leg plate 18. . In the axial direction of the trigger lever 78 and the leg plate 18
A pawl 80 as a lever is connected to the side via a pin 82, and a winding diameter sensing arm 84 as winding diameter sensing means is fixed to the pawl 80.

On the other hand, the tip of the pawl 80 is connected to the leg plate 18 by a tension coil spring 86 as an elastic holding member, and the rear end is pivotally supported by the leg plate 18. Therefore,
The trigger lever 78, the pawl 80, and the winding diameter sensing arm 84 are biased clockwise in the state shown in FIG. However, by forcibly turning the trigger lever 78 counterclockwise, the pawl 80 moves counterclockwise around the pivot point 88, and the line connecting both end supports of the tension coil spring 86 moves away from the pivot point 88 of the pawl 80. 2, the biasing direction of the tension coil spring 86 is switched, and the trigger lever 78, the pawl 80, and the winding diameter sensing arm 84 rotate together in the counterclockwise direction. In order to allow the trigger lever 78 and the pawl 80 to rotate smoothly, it is desirable to form an elongated hole 90 in the trigger lever 78.

When the pawl 80 pivots counterclockwise, it engages the ratchet teeth 92 of the locking wheel 50 and serves to prevent the locking wheel 50 from rotating.

The tip of the winding diameter sensing arm 84 is curved and comes into contact with the outer surface of the webbing 24 wound around the winding shaft 22, as seen in FIGS. 1 and 2. Therefore, when the webbing 24 is wound around the winding shaft 22 and its winding diameter is greater than a predetermined value, this arm 84
This maintains the trigger lever 78 and the pawl 80 in the state shown in FIG. 2, that is, in a state in which the pawl 80 and the ratchet teeth 92 are not engaged, but when the webbing 24 is pulled out and the winding diameter becomes smaller, the above action is canceled. becomes.

After each of the above members is attached to the winding device 10,
It is covered with a predetermined cover 94.

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 where the maximum amount is wound on the winding shaft 22, and the winding diameter sensing arm 84 and the tension coil spring 86
The pawl 80 is in a non-engaging position with the lock ring 50 due to the biasing force. Therefore, the lock wheel 50 is rotatable, and the occupant can move the webbing 24 onto the take-up shaft 22.
can be extracted from.

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. As the webbing 24 is pulled out, the lock ring 50, rotor 56, operating ring 64, and inertia plate 66 rotate, but the internally toothed ratchet wheel 60 does not rotate.

Next, when the tongue plate is inserted into the buckle and the webbing is attached, when the webbing 24 is suddenly pulled, the inertia plate 66 deflects the tension coil spring 74 and causes a rotation delay, causing the pawl 68 to protrude and cause the internal tooth ratch foil to flex. 60.
Therefore, the internal tooth ratchet foil 60 has the arcuate groove 6
2 (see FIG. 3) in the clockwise direction in FIG.
is rotated counterclockwise against the biasing force of the tension coil spring 86. At this point, the webbing 24 has been pulled out by a certain amount from the take-up shaft 22, so the winding diameter sensing arm 84 has already released the rotation preventing action of the trigger lever 78 and the pawl 80.

When the trigger lever 78 and the pawl 80 turn counterclockwise and the line connecting both ends of the tension coil spring 86 crosses the pivot point 88 of the pawl 80, the biasing direction of the tension coil spring 86 is switched and the pawl 80
engages ratchet teeth 92 of locking wheel 50.
If the webbing 24 is further pulled out with the lock ring 50 being prevented from rotating, the lock plates 34 and 36 engage with the internal ratchet foil 30 as shown in FIG. 4B, preventing the webbing 24 from being unwound. be done.

However, as can be seen from the shape of the ratchet teeth 92 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.

When the webbing unwinding stop of the winding device 10 is canceled, the tongue plate is removed from the buckle and the entire amount of the webbing 24 is wound onto the winding shaft 22. As the webbing winding diameter on the winding shaft 22 increases, the winding diameter sensing arm 84 gradually rotates the trigger lever 78 and the pawl 80 clockwise, causing the pawl 80 to disengage from the ratchet teeth 92. Further, if the line connecting both ends of the tension coil spring 86 moves downward beyond the pivot point 88 (in the direction away from the lock ring 50) when the pawl 80 turns, the biasing direction of the tension coil spring 84 is also switched. Therefore, the trigger lever 78 and the pawl 80 are reliably separated from the ratchet teeth 92 by the snap action, returning to the state shown in FIG. 2.

Although this embodiment shows a self-locking retractor, it is also possible to use the device as an emergency locking retractor (ELR). In this case, it is only necessary to install an acceleration sensor near the lock wheel 50, and there is no need to significantly change the parts.

An example of the acceleration sensor is a combination of an inertial weight and a trigger lever, and the operation order thereof will be briefly explained as follows. When the vehicle is in a normal running state, the webbing 24 is not prevented from being pulled out, but is slightly pulled by a mainspring spring in the take-up device. However, when acceleration of a predetermined value or higher occurs in the vehicle, the trigger lever is activated due to the vibration of the inertia weight, and this lever is activated to lock the locking wheel 50.
prevent rotation. After the rotation of the lock wheel 50 is prevented, the lock plates 34, 3
6 engages with the internal tooth ratchet foil 30 to stop unwinding of the webbing 24.

Alternatively, a combination of an electric acceleration sensor and a solenoid can be installed near the lock wheel 50, and the solenoid can prevent the lock wheel 50 from rotating.

In the embodiments of FIGS. 1 and 2, webbing 2
Although an inertia lock mechanism such as an internal tooth ratchet 60, an inertia plate 66, and a pawl 68 is used as a means for sensing the sudden withdrawal of the trigger lever 78 and the pawl 80, other sensing means may be used to operate the trigger lever 78 and the pawl 80. .

As described above, the webbing retractor of this embodiment can be used in either the automatic lock type or the emergency lock type, and therefore has the advantage of being able to use common parts when manufacturing the webbing retractor. Further, since the winding shaft is locked by the lock plates 34 and 36, the lock ring itself can be made of resin, and therefore, when winding the webbing 24, the pawl 80
It is possible to prevent abnormal noise from occurring between the two.

In the above embodiment, a torsion coil spring 54 (see FIG. 3) is engaged with the lock ring 50 so that the winding shaft 22 is rotated. Directly take up the winding shaft 2
It may be fixed to 2. In this case, Paul 8
0 engages with the ratchet teeth 92 and directly rotates the winding shaft 22.
The torsion coil spring 54 can be locked.
Not only that, but also the lock plates 34, 36 and the internally toothed ratchet foil 30 can be omitted.
When the webbing 24 is attached, it is possible to wind the webbing 24 in the same way as in the previous embodiment, but unwinding is prevented by the pawl 80 locking the lock ring 50 and the winding shaft 22.

The webbing retractor having such a configuration can also be used as an emergency lock type retractor by attaching a vehicle acceleration sensor near the lock wheel 50. In this embodiment, the number of parts can be further reduced than in the first embodiment.

[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 that guides the lock member to a take-up shaft rotation blocking state when rotation is stopped, a state that engages with the lock ring to prevent rotation of the lock ring, and a state that is separated from the lock ring to enable rotation of the lock ring. a lever arranged to be movable between the two states; an elastic holding member connected to the lever and holding the lever in one of the two states by elastic force; an acceleration sensing means that rotates in a direction to pull out the webbing by sensing that the webbing is being pulled out, presses the lever, and moves the lever to the locking wheel rotation blocking state against the elastic holding force of the elastic holding member; 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 It is equipped with a winding diameter sensing means that restricts the movement of the lock wheel to the state where it is prevented from rotating and allows the lock wheel to rotate, so it can be used with both automatic lock type and emergency lock type winding devices. Therefore, parts can be made common, and furthermore, since the lever is held by an elastic holding member, the operation of the automatic locking type can be ensured.

[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 of the webbing retractor with the cover removed, and Fig. 3 is an exploded perspective view of the main parts. 4A and 4B are partial sectional views showing the operating state of the lock plate. 10... Webbing winding device, 22... Winding shaft, 24... Webbing, 30... Internal tooth ratchet foil, 34, 36... Lock plate, 50
... Lock ring, 60 ... Internal tooth ratchet foil,
66... Inertia plate, 68... Pawl, 78... Trigger lever, 80... Paul, 84... Winding diameter sensing arm, 86... Tension coil spring, 92... Ratchet tooth.

Claims (1)

[Claims for Utility Model Registration] 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 a direction in which the webbing is pulled out, and a locking member that rotates following the take-up shaft. A lock ring that guides the lock member to a take-up shaft rotation inhibiting state when the winding is stopped; a state that engages with the lock ring to prevent rotation of the lock ring; and a state that is separated from the lock ring to enable rotation of the lock ring. a lever arranged to be movable between the two states; an elastic holding member connected to the lever and holding the lever in one of the two states by elastic force; an acceleration sensing means that rotates in the direction of pulling out the webbing by sensing the pulling out and presses the lever to move the lever to the locking wheel rotation blocking state against the elastic holding force of the elastic holding member; The lever is connected to the webbing 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, it comes into contact with the wound webbing and locks the lever. A webbing retractor comprising: winding diameter sensing means for restricting movement to a state in which rotation of the ring is inhibited and enabling a state in which the locking wheel rotates;