JPH0347007Y2 - - 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, which is used in a seat belt device for protecting an occupant in a vehicle emergency.

[Background Art] A webbing take-up device that is used in a seat belt device for protecting a vehicle occupant and winds up an end of a restraining webbing uses a biasing force to wind up and store the webbing.

Among these webbing retractors, webbing retractors that are equipped with an automatic unwinding stop mechanism that stops any further webbing from being pulled out after the occupant has put on the webbing ensure that the occupant can be restrained in the event of a vehicle emergency. However, under normal running conditions, the ratchet mechanism within the automatic unwinding and stopping mechanism gradually winds up the webbing, causing so-called stomach tightening, which impairs the comfort of the occupant.

In addition, if the webbing retractor is equipped with an emergency unwinding stop mechanism that detects an emergency state of the vehicle using an acceleration sensor and stops unwinding the webbing, the occupant may experience a strong feeling of pressure from the webbing when the vehicle is normally running. However, when attaching luggage, containers for infants, etc. to the seats using webbing, these attachments were not perfect.

In other words, the webbing is unnecessarily unwound from the retractor due to low acceleration in the range where the acceleration sensor does not operate, vibrations caused by the movement of the infant in the storage container, etc., and the baggage and storage container move on the seat, causing instability. become.

In addition, a retractor has been proposed that is equipped with a mechanism that manually locks the webbing retractor with an emergency unwinding stop mechanism to stop the unwinding of the webbing as necessary. Since the manual lock mechanism is attached to the vehicle, it is necessary to place the operating lever of the manual lock mechanism in a narrow and difficult-to-operate position, such as under the seat, making operation complicated.
The locking mechanism may make noise during winding.
Furthermore, in order to carry out this operation remotely, it becomes necessary to arrange a connecting means such as a wire inside the vehicle body.

[Purpose of the invention] In consideration of the above facts, the present invention is a single webbing retractor, but it is a webbing retractor with an automatic unwinding stop mechanism or an emergency webbing retractor with an emergency unwinding stop mechanism. It is an object of the present invention to provide a webbing retractor that can be used as a webbing retractor and can handle changes in the length of the webbing.

[Summary of the invention] In the webbing retractor according to the present invention, the acceleration sensor applies a rotational resistance force to the lock ring of the locking means in the event of a vehicle emergency to prevent the webbing unwinding rotation of the retracting shaft, and In use, when the webbing take-up amount exceeds a predetermined value, the control member is biased in the direction away from the lock ring, and acts as a webbing take-up device with an emergency unwinding stop mechanism, so that the webbing take-up amount reaches the predetermined value. As described above, the locking wheel is biased in the direction toward the lock ring, and the webbing retractor functions as a webbing retractor with an automatic unwinding and stopping mechanism, and even when the webbing retracting amount exceeds the predetermined value, the control member is activated. is moved in a direction away from the lock ring to cope with changes in the amount of webbing taken up.

[Example of idea] Embodiments of the present invention will be described below with reference to the drawings.

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 restraint webbing 24 is wound in a layer around the center of the winding shaft 22.
The other end (not shown) is attached to other parts of the vehicle body via a tongue plate, buckle device, etc., so that the middle part of the webbing 24 can be attached by the occupant.

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 internally toothed ratchet foil 60, which is a component of the locking means, is fixed to the outside of the leg plate 18 with a plurality of rivets. This internal tooth ratchet foil 3
0 corresponds to a pair of lock plates 34 and 36, which are constituent members of the lock means also shown in FIGS.

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 internal toothed ratch foil 30 moves as shown in FIG. The webbing unwinding rotation of the winding shaft 22 is stopped by interlocking with the winding shaft 22.

A pair of pins 46 protrude from one side of each of the lock plates 34 and 36 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 rotatably supported on the support shaft 48, and four elongated holes 52 are formed in the surface of the lock plate of the lock ring 50, as shown in FIG. Lock plates 3 are inserted into these elongated holes 52, respectively.
A pin 46 protruding from the lock plates 4 and 36 is accommodated therein, so that the pair of lock plates 34 and 36 can be moved in opposite directions by the stroke of the elongated hole 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 biased clockwise with respect to the winding shaft 22 in FIG. Therefore, when the winding shaft 22 is unwound in the webbing unwinding direction at a predetermined acceleration or less, the lock ring 50 receives the spring biasing force, follows the winding shaft 22, and rotates integrally with the winding shaft 22. I'm starting to do that. However, when the webbing unwinding rotation of the take-up shaft 22 exceeds a predetermined value, the torsion coil spring 54 is bent, causing a rotation delay. This rotational delay is caused by the lock plate 3 as shown in FIG.
4 and 36 are moved in opposite directions, and during this movement the pin 46 of the lock plates 34 and 36 moves within the elongated hole 52. Therefore, the locking wheel 50, the locking plates 34, 36 and the internal toothed ratchet foil 3
0 constitutes a locking means for the winding shaft 22.

In a normal state where the take-up shaft 22 is not rapidly rotating to unwind the webbing, the pins 46 of the lock plates 34 and 36 come into contact with one end of the elongated hole 52, and one end of the recess 40 as shown in FIG. The portion contacts the winding shaft rectangular protrusion 38 as a stopper 40A.

The lock ring 50 has ratchet teeth 56 on its outer periphery.
is engraved and corresponds to the pole 58 pivotally supported on the leg plate 18. This pole 58 is the leg plate 18
is pushed up by an inertia ball 62 housed in a case 60 of the casing 60 and comes into engagement with the ratchet teeth 56. This inertia ball 62 separates the pawl 58 from the ratchet teeth 56 in the normal state of the vehicle, but when the vehicle acceleration reaches a predetermined value, it moves, engages the pawl 58 with the ratchet teeth 56, and unwinds the webbing of the lock wheel 50. It has the role of an acceleration sensor that applies resistance to directional rotation and causes a rotational delay between the winding shaft 22 and the winding shaft 22.

As the acceleration sensor, in addition to such an inertial body such as a ball, other configurations such as a pendulum or a member that falls over at a predetermined acceleration can be used.

A pinion 64 is fixed coaxially to the support shaft 48 and rotates together with the winding shaft 22. This pinion 64 includes a pinion 68 that is pivotally supported on a cover 66 that is attached to the outside of the leg plate 18.
The pinion 68 is further engaged with an internal gear 72 of a rotary ring 70. This rotary ring 70 has a support ring 74 coaxially protruding toward the side opposite to the leg plate 18 and housed inside an arcuate protrusion 76 protruding from the cover 66, so that the winding shaft 22
is coaxially supported. As a result, the rotating ring 70 is connected to the winding shaft 2 through the pinions 68 and 64.
The rotation of No. 2 is decelerated and transmitted.

The rotating ring 70 has an engaging protrusion 80 from a part of its outer circumference.
protrudes and corresponds to one end of an arm 84 serving as a control member pivotally supported on the leg plate 18 by a pin 82. The other end of this arm 84 is an engaging pawl 84A that corresponds to the ratchet teeth 56 of the locking wheel 50.

Here, a torsion coil spring 86 is interposed between the arm 84 and the leg plate 18, and the engaging pawl 84A approaches the ratchet tooth 56 from the state shown in FIG. The state shown in FIG. 8, in which the device receives a biasing force in the direction, is selectively adopted.

That is, in the state shown in FIG. 2, the torsion coil spring 86
The attachment end to the arm 84 is the ratchet tooth 56.
(dimension L), whereby the arm 84 receives a biasing force in the direction in which the engaging pawl 84A moves away from the ratchet tooth 56.

In the state shown in FIG. 8, on the contrary, the end of the torsion coil spring 86 attached to the arm is attached to the ratchet teeth with respect to the straight line connecting the end of the torsion coil spring 86 that is locked to the leg plate 18 and the axis of the pin 82. 56 side (dimension M), whereby the engaging pawl 84A receives a biasing force in the direction toward the ratchet tooth 56 and engages with the ratchet tooth 56.

Further, in the state shown in FIG. 7, the webbing 24 is in a fully wound state in which the maximum amount of the webbing 24 is wound onto the take-up shaft, that is, the occupant is not wearing the webbing and the webbing 24 is in a retracted state. Just before this stored state, arrow A
The engagement protrusion 80 of the rotary ring 70 rotating in the direction moves the arm 84 from the state shown in FIG. 8 to the state shown in FIG. It is designed to move to the illustrated state.

Further, the engagement protrusion 80 of the rotating ring 70 rotates in the direction of arrow B as the webbing 24 is unwound, and when the webbing 24 is unwound by almost the maximum amount, it comes into contact with the opposite side of the protrusion of the arm 84, conversely causing the arm 84 to be unwound. It is designed to move from the state shown in FIG. 2 to the state shown in FIG.
The engaging protrusion 80 does not come into contact with the arm 84 between the fully wound state and the maximum unwound state of the rotating ring 70.

One end of a leaf spring 87 serving as an elastic body corresponds to the engaging claw 84A of the arm 84, and constitutes play means. That is, the center portion of the leaf spring 87 is locked to the leg plate 18 by a pin 88A, and the engagement claw 84
The end opposite to the end corresponding to A is locked to the leg plate 18 by a pin 88B, and has a resistance force against external force acting in a direction that reduces the included angle between both ends. Further, the end of the leaf spring 87 corresponding to the engaging claw 84A is locked to the leg plate 18 by a pin 88C, and similarly has a resistance force against an external force acting in a direction that reduces the included angle between both ends. It's summery.

Therefore, the engaging pawl 84A is rotatable from the state shown in FIG. 2 in a direction further away from the ratchet teeth 56 against the biasing force of the leaf spring 87.

A friction ring 89 shown in FIG. 3 is attached to the outer periphery of the rotating ring 70. The friction ring 89 is made of a plate spring material and constitutes a holding means, and is approximately C-shaped.
The outer periphery is tightened with elastic force.

An L-shaped engagement protrusion 90 integrally projects from a portion of the friction ring 89 and corresponds to the arm 84 . Also, from this friction ring 89 there is an engaging protrusion 9.
A linear limiting protrusion 91 protrudes near 0 and is inserted into a guide groove (not shown) provided in the cover 66. The friction ring 89 is rotated counterclockwise from the state shown in FIG. 9 to the state shown in FIG. 8 by the guide groove of the cover 66. In the state shown in FIG. 9, the engagement protrusion 89 rotates the arm 84 against the biasing force of the torsion coil spring 86 and separates the engagement pawl 84A from the ratchet teeth 56, but the biasing force of the torsion coil spring 86 The torsion coil spring 86 rotates the engaging pawl 84A to the ratchet tooth 5 without rotating it to the boundary point where it is reversed to the state shown in FIG.
6 is maintained.

Therefore, in a state where the webbing 24 is largely wound onto the winding shaft 22, such as when the occupant releases the webbing 24, the engaging pawl 84A will not engage the ratchet teeth 5.
6, the engaging pawl 84A and the ratchet tooth 56
There is no noise generation due to repeated collisions with

The operation of this embodiment configured as described above will be explained.

FIG. 2 shows a state immediately before the webbing 24 is wound up to the maximum amount onto the take-up shaft, and FIG. 7 shows a state where the webbing 24 has been wound up to the maximum extent, and the arm 84 has already been latched by the engaging protrusion 80 so that the engaging claw 84A is latched. The lock ring 50 is biased in a direction away from the teeth 56.
can rotate following the winding shaft 22.

Therefore, when the occupant unwinds the webbing 24 from the take-up shaft 22 in order to attach it, the lock ring 50 rotates accordingly, allowing the occupant to attach the webbing 24, and the emergency unwinding stop mechanism is activated. Can be used as a webbing take-up device.

As a result, when the vehicle is in an emergency situation such as a collision while the vehicle is running, the inertia ball 62 pushes up the pawl 58 and engages with the ratchet teeth 56.
Rotation of the ratchet teeth 56 is stopped. At the same time, the occupant wearing the webbing 24 moves in the direction of the collision due to inertia, so the webbing 24 is unwound and the take-up shaft 22 is rotated.

Since rotation of lock wheel 50 has ceased, take-up shaft 22 drives lock plates 34, 36 in opposite directions into engagement with internally toothed ratchet wheel 30 as shown in FIG. As a result, the rotation of the take-up shaft 22 in the webbing unwinding direction is stopped, and the webbing 24 restrains the occupant.

When the occupant operates the webbing retractor 10 as an automatic unwinding and stopping mechanism, the webbing 24 may be brought into the maximum unwinding state. That is, the engaging protrusion 80 rotated in the direction of arrow B in FIG. 2 due to the unwinding of the webbing 24 comes into contact with the opposite side of the arm 84, and engages the engaging pawl 84A with the ratchet tooth 56 as shown in FIG. This prevents the lock ring 50 from rotating in the webbing unwinding direction.

As a result, when the webbing 24 is unwound, the lock plates 34 and 36 are engaged with the internal tooth ratchet foil 30 as shown in FIG.
Since the webbing 24 is engaged, the unwinding of the webbing 24 is stopped.

However, since it is possible to wind up the webbing 24, when the webbing 24 is attached to a passenger or luggage, it acts as a webbing retractor equipped with an automatic unwinding and stopping mechanism, resulting in a secure restraint state. Particularly when using this automatic unwinding and stopping mechanism, if the baggage is fixed to the seat with the webbing 24, the baggage can be securely restrained to the seat even with small accelerations that do not activate the inertia ball 62, so there is no need to worry. The luggage will not fall off.

Also, when canceling the automatic unwinding stop mechanism,
When the webbing 24 is released from the passenger, luggage, etc. and the webbing 24 is completely wound onto the take-up shaft 22, the rotating ring 70 rotates in the direction of arrow A in FIG. Like engagement claw 84A
is sufficiently spaced from the ratchet tooth 56, and the biasing state is reversed beyond the boundary point to reach the state shown in FIG.
Therefore, it can be used again as a webbing retractor with an emergency unwinding stop mechanism.

In particular, in this embodiment, since the play means is constituted by the leaf spring 87, even if the webbing 24 is wound up vigorously by the biasing force of the mainspring spring 26, or if there is variation in the length of the webbing 24, As shown in FIG. 7, the engaging protrusion 80 pushes down the arm 84 and moves. For this reason, the engagement protrusion 80,
Since no large stress is applied to the arm 84, problems such as damage to the engagement protrusion 80 and the arm 84 do not occur.

During such operation of the webbing 24,
The arm 84 does not come into contact with the engagement protrusion 80 of the rotating ring 70 when the webbing 24 is not fully wound or completely unwound, and its operation is reliable.

In addition, when the webbing 24 is wound up, the L-shaped engagement protrusion 90 comes into contact with the arm 84 as shown in FIG. No noise is generated due to repeated collisions with the dowel 84A.

[Effects of the invention] As explained above, the webbing retractor according to the present invention has a lock ring that rotates to follow the winding shaft, a lock means that prevents rotation of the winding shaft due to a rotation delay of the lock wheel, and a locking mechanism that prevents rotation of the winding shaft in case of a vehicle emergency. an acceleration sensor that applies a resistance force to the following rotation of the webbing, a control means whose biasing force is reversed by a change in the amount of webbing taken up, and a control means that further separates the control means from the lock wheel when the amount of webbing taken up exceeds a predetermined value. Since it has a play means, it can be used as a webbing retractor with an emergency unwinding stop mechanism and a webbing retractor with an automatic unwinding stop mechanism as needed.It also protects the control means and can be used to change the length of the webbing. It has excellent effects that can be dealt with.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a first embodiment of the webbing retractor according to the present invention, Fig. 2 is a left side view showing the state immediately before maximum retrieval of the webbing with the cover of Fig. 1 removed, and Fig. 3 is an exploded perspective view showing the main parts of FIG. 1, FIG. 4 is a front view corresponding to the cross-sectional view taken along the line in FIG. 1, showing the lock plate and its related structure;
5 is an operating diagram of FIG. 4, FIG. 6 is a back view of the lock ring, FIG. 7 is an operating diagram of FIG. The operating diagram in Fig. 2 shows the state in which the webbing is biased toward the
FIG. 10... Webbing winding device, 22... Winding shaft, 24... Webbing, 30... Internal tooth ratchet foil, 34, 36... Lock plate, 50
...Lock ring, 56...Ratchet tooth, 58...
Pole, 62... Inertia ball, 64, 68... Pinion, 70... Rotating ring, 80... Engaging protrusion, 84... Arm, 84A... Engaging claw, 86...
...Torsion coil spring, 87...Plate spring.

Claims (1)

[Scope of utility model registration request] A lock ring that rotates following a take-up shaft of webbing for occupant restraint; a lock means that prevents the take-up shaft from unwinding the webbing when the lock ring lags in rotation with respect to the take-up shaft; an acceleration sensor that applies a resistance force to the follow-up rotation of the locking wheel in an emergency; a control member rotatable from an engaged state to the separated state to the separated state; and a neutral position between the engaged state and the separated state. When the control member is closer to the engaged state than the neutral position, the control member is urged toward the engaged state, and when the control member is closer to the separated state than the neutral position, the control member is urged to the separated state. a biasing means for biasing the control member toward the engaged state side from a neutral position when the webbing unwinding amount reaches a predetermined value; a protrusion that moves the control member from the neutral position to the separated state side; an elastic body that allows the control member to further move in the direction of separation from the lock ring when the webbing take-up amount exceeds the predetermined value; A webbing take-up device comprising: