KR102370562B1 - Load limiter whose operating section is adjusted according to the rotation speed of the spool - Google Patents

Abstract

According to the present invention, the load limiter whose operating section is adjusted according to the rotational speed of the spool is a load limiter capable of controlling the torsion time of a torsion bar provided in a spool rotatably connected to the inside of the frame, and rotates together with the spool. a first rotating body; a second rotating body rotating at a rotation speed different from that of the first rotating body according to a preset condition; and a torsion control unit for controlling the torsion bar to be twisted by controlling the rotation of the spool according to the difference in the rotational speeds of the first and second rotating bodies.

Description

A load limiter whose operating section is adjusted according to the rotational speed of the spool {LOAD LIMITER WHOSE OPERATING SECTION IS ADJUSTED ACCORDING TO THE ROTATION SPEED OF THE SPOOL}

The present invention relates to a load limiter, and more particularly, to control the twisting time of the torsion bar to flexibly adjust the load acting between the occupant and the webbing when a person of all ranges, including a solid adult, boards. And, after buffering, it relates to a load limiter whose operating section is adjusted according to the rotational speed of the spool, which can also prevent a collision with the front structure.

In general, a seat belt for restraining an occupant during a vehicle collision is provided on a vehicle seat to prevent the occupant from protruding forward due to a vehicle collision and colliding with a vehicle body or object, thereby preventing injury.

However, when a vehicle collision occurs with the seat belt, the body of the occupant is tilted forward due to inertia, and the webbing provided on the seat belt strongly presses the chest region.

Therefore, in the case of firmly fixing the occupant by increasing the binding force of the webbing, the injury caused by the occupant protruding forward due to the collision of the vehicle and colliding with the vehicle body or object can be reduced. Compression may cause chest or abdominal damage.

Therefore, in recent years, the seat belt is provided with a load limiter that prevents the load acting between the occupant and the webbing from exceeding a preset load range in order to relieve the pressure applied to the occupant's chest region by the strong binding force of the webbing.

These load limiters are divided in various ways depending on how the load acting between the occupant and the webbing does not exceed the preset load range. After limiting, there is a progressive load limiter that sequentially limits one more time at a high load.

However, the progressive load limiter developed so far is prepared so that the initially set torsion limit value cannot be changed, so that the low load torsion bar is twisted only by the set angle, and then the torsion bar with the high load is twisted by the set angle. Therefore, there is a problem in that the twist time of the torsion bar cannot be adjusted in consideration of environmental factors or the condition of the occupant.

Therefore, the following research tasks are being conducted to solve these problems.

[Project unique number] 20005782

[Title] Development of an ultra-light (800 g or less) seat belt with minimal deviation in crash load (less than 0.3 kN) to reduce chest injuries in vehicle accidents compared to existing seat belts

[Business field] Auto parts business vitality improvement project

[Research Institute] Wooshin Safety System

[Research Period] 2019-05-01 ~ 2020-04-30

In order to solve the above problems, the present invention is provided to control the torsion bar torsion time according to the rotational speed of the spool. An object of the present invention is to provide a load limiter whose operating section is adjusted according to the rotational speed of the spool, which can flexibly control the load acting on the liver and prevent the occupants of all ranges from colliding with the front structure after buffering. .

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, according to one aspect of the present invention, the load limiter whose operation section is adjusted according to the rotational speed of the spool controls the torsion time of the torsion bar provided in the spool rotatably connected to the inside of the frame As a load limiter capable of, the first rotating body rotating together with the spool; a second rotating body rotating at a rotation speed different from that of the first rotating body according to a preset condition; And by controlling the rotation of the spool according to the difference in the rotational speed of the first rotating body and the second rotating body, torsion control unit for adjusting the twisting of the torsion bar; may include a.

The second rotating body is constrained to each other and rotates at the same rotational speed, and while the constraint with the first rotating body is released according to a preset condition, the rotation is different from the rotational speed of the first rotating body. By rotating at a speed, it may have a difference in rotation speed with the first rotating body.

The torsion control unit, by stopping the rotation of the spool as the first rotating body and the second rotating body stop the rotation of the first rotating body by a stopper that operates when a difference in rotational speed occurs, Twisting of the torsion bar can be stopped.

The preset condition may be a physical condition of the passenger.

When the body weight of the occupant is less than a preset weight range as the body condition of the occupant, the torsion control unit operates the stopper as the difference in rotation speed between the first and second rotating bodies does not occur. The torsion bar may be twisted continuously as the spool continues to rotate.

When the occupant's body weight is greater than a preset weight range as the occupant's physical condition, the torsion control unit operates the stopper as a difference in rotation speed between the first rotating body and the second rotating body occurs, By stopping the rotation of the spool, it is possible to end the twisting of the torsion bar.

The stopper may include: a locking plate provided on the outside of the frame and having gear teeth formed on an inner circumferential surface; and a locking pole provided on the first rotation body so as to be drawn outwardly around the rotation shaft of the first rotation body according to a preset condition and engage the gear teeth.

The locking pole may be drawn out along a guide groove provided in the second rotating body and engaged with the gear teeth of the locking plate.

In order to solve the above problems, according to another aspect of the present invention, the load limiter whose operation section is adjusted according to the rotational speed of the spool is configured such that the first rotating body and the second rotating body are constrained to each other and rotate. , a retainer for releasing the restraints of the first rotating body and the second rotating body according to a preset condition to allow the second rotating body to freely rotate with respect to the first rotating body; may further include .

Here, the retainer, while fixing the first rotating body and the second rotating body, to release the fixing of the first rotating body and the second rotating body by the torque of the first rotating body under a preset condition, the It may include; a clutch spring for fixing the first rotating body and the second rotating body.

The load limiter in which the operation section is adjusted according to the rotation speed of the spool of the present invention has the following effects.

First, it is provided to adjust the twisting time of the torsion bar in response to the rotational speed of the spool, so that the load acting between the occupant and the webbing can be flexibly adjusted when a person of all ranges, including a solid adult, boards. There are advantages.

Second, by flexibly controlling the load acting between the occupant and the webbing, there is an advantage in that it is possible to prevent a collision with the front structure of the occupant in all ranges, including adults in solid weight, after buffering.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The summary set forth above as well as the detailed description of the preferred embodiments of the present application set forth below may be better understood when read in conjunction with the accompanying drawings. For the purpose of illustrating the invention, there are shown in the drawings preferred embodiments. It should be understood, however, that the present application is not limited to the precise arrangements and instrumentalities shown.
1 is a view showing a state in which a load limiter of which an operating section is adjusted according to the rotational speed of a spool according to an embodiment of the present invention is mounted on a frame;
Figure 2 is a view showing an exploded perspective view of the load limiter the operating section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention;
3 is a view showing a state in which the first rotating body and the second rotating body of the load limiter are combined according to the rotational speed of the spool according to an embodiment of the present invention;
Figure 4 is a first rotating body of the load limiter whose operation section is adjusted according to the rotation speed of the spool according to an embodiment of the present invention is coupled to the spool so that it can rotate at a predetermined angle by inertia when the pretensioner is operated; A drawing showing;
5 is a first rotating body of the load limiter whose operating section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention is rotated at a predetermined angle within the spool due to inertia when the pretensioner is operated, and the shear pin is broken; A drawing showing a state in which the locking pole is fixed by being removed;
6 is a first rotational body and a second rotational body of the load limiter whose operation section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention rotates at different rotational speeds, the first rotational body and the second rotational speed; It is a view showing a state in which the locking pole provided between the whole is fixed to the locking plate.

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be specifically realized will be described with reference to the accompanying drawings. In the description of the present embodiment, the same names and the same reference numerals are used for the same components, and an additional description thereof will be omitted.

1 is a view showing a state in which a load limiter 10 whose operation section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention is mounted on a frame, and FIG. 2 is a spool according to an embodiment of the present invention. It is a view showing an exploded perspective view of a load limiter whose operating section is adjusted according to the rotation speed of It is a view showing a state in which the second rotating body is coupled.

Before describing the present invention, a frame (F) may be provided on a seat belt of a vehicle in which a load limiter whose operation section is adjusted according to the rotational speed of the spool is provided, and at this time, the spool is inside the frame (F). The webbing wound on the connector spool (S) may be drawn in or drawn out so that (S) is rotatable in the frame (F).

In this case, the frame F may be provided with various retractors for the safety of the occupants.

Specifically, here, a return spring (R) for drawing the drawn webbing into the frame (F) may be provided at one end of the spool (S), and the other end of the spool (S) may be provided with a webbing in the event of a vehicle collision. A pretensioner (P) for drawing into the frame (F) may be provided.

Here, when a vehicle crash occurs, the binding force of the webbing can be increased due to the pretensioner (P) to firmly fix the occupant. The webbing exerts strong pressure on the chest area.

Therefore, in the case of firmly fixing the occupant by increasing the binding force of the webbing, the injury caused by the occupant protruding forward due to the collision of the vehicle and colliding with the vehicle body or object can be reduced. In order to limit the load acting between the occupant and the webbing through the torsion bar provided inside the spool (S), the load limiter ( 10) can be provided.

1 and 2, the load limiter 10 whose operating section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention is largely a first rotating body 200, a second rotating body ( 400), and may include a torsion control unit 600 .

First, the first rotating body may be provided to rotate together with the spool (S). Specifically, the first rotating body is provided so as to be shaft-coupled to the torsion bar (T) provided inside the spool (S), whereby the torsion bar ( When the spool (S) rotates due to the twist T), the first rotating body 200 may also rotate.

In other words, the first rotating body 200 may rotate at the same rotational speed as the torsional rotational speed of the torsion bar (T).

In addition, the first rotating body 200 is provided with a locking pawl inlet groove so that a locking pawl 622, which will be described later, can be drawn in and out, and a retainer (by a clutch spring 820) together with the second rotating body 400. 800) can be connected.

In this case, a connecting member protruding in the direction of the second rotating body 400 may be provided on one surface of the first rotating body 200 so that the second rotating body 400 is rotatable on the connecting member.

In addition, a driver may be provided at the end of the first rotating body 200 so that the above-described return spring R can be mounted.

Next, the second rotating body 400 may be provided to rotate at a different rotational speed than the first rotating body 200 according to a preset condition.

Here, the preset condition will be described in detail later through the operation process.

Specifically, the second rotating body 400 is provided in the form of a circular ring so that the inner circumferential surface is in contact with the outer circumferential surface of the connecting member of the first rotating body 200 described above, the first rotating body 200 on the first rotating body 200 . ) and may be provided to be rotatable about the same axis.

In other words, including the spool (S), the torsion bar (T) connected to the inside of the spool (S), the first rotating body 200, and the second rotating body 400 may be provided to rotate about the same axis. .

Here, the second rotating body 400 is constrained to the first rotating body 200 fixed by a shear pin 840 to a retainer 800 to be described later by a clutch spring 820 to be described later, and a pretensioner P ) is operated and when the shear pin 840 is broken by inertia, the first rotating body 200 is provided to be rotatable, so that the second rotating body 400 can also rotate constrained with the first rotating body 200 . .

At this time, the second rotating body 400 may be a weight body provided so that the clutch spring 820 releasing the restraint with the first rotating body 200 according to a preset condition is released to rotate at different rotational speeds.

In this case, the second rotating body 400 is the first rotating body 200 whose rotation speed is variable in response to the torsion of the torsion bar T, and when the restraint is released according to a preset condition, the first rotating body 200 ) and a method of rotating at a different rotational speed may be various, but a method of adjusting the moment of inertia through the weight of the second rotating body 400 will be simple.

In addition, the second rotation body 400 may include a guide groove, the guide groove is a first rotation to be described later when the second rotation body 400 rotates at a speed different from that of the first rotation body 200 . The locking pole 622 connected between the entire 200 and the first rotating body may serve to guide the withdrawing from the first rotating body 200 to be fixed to the locking plate 624 .

The torsion control unit 600 controls the rotation of the spool (S) according to the difference in rotational speed between the first rotating body 200 and the second rotating body 400, thereby controlling the torsion bar (T) to be twisted. can play a role.

Specifically, the torsion control unit 600 may include a stopper, which stops the rotation of the spool (S) when a difference in rotational speed between the first rotating body 200 and the second rotating body 400 occurs. can play a role.

Such a stopper may vary with respect to a structure, shape, material, etc. if it performs the function as described above, and thus the scope of rights is not limited.

At this time, the method of stopping the rotation of the spool (S) may be various, but the frame ( F) and the method of constraining the first rotating body 200 will be simple.

Hereinafter, a method in which the stopper is provided to withdraw the locking pole 622 between the first rotating body 200 and the second rotating body 400 and fixed to the locking plate 624 provided in the frame F will be described. .

In this case, the stopper may include a locking plate 624 and a locking pole 622 .

Here, the locking plate 624 has a gear tooth formed on the inner circumferential surface, is mounted on the outside of the frame F, and the locking pole 622 is fixed to the gear tooth of the inner circumferential surface to stop the rotation of the first rotating body 200. As a result, the spool The restraint of (S) can be stopped.

At this time, when the first rotating body 200 and the second rotating body 400 have different rotational speeds under a preset condition, the locking pole 622 moves outward about the rotational axis of the first rotating body 200 . It may be drawn out to be provided to be engaged with the gear teeth.

Here, the locking pole 622 protrudes in the direction of the second rotation body 400 so as to be withdrawn outward about the rotation axis of the first rotation body 200 along the guide groove of the second rotation body 400 . The protruding member may be introduced into the guide groove.

At this time, the locking pole 622 may be drawn out outwardly about the rotational axis of the first rotating body 200 , and a plurality of gear teeth may be provided at one end thereof to be engaged with the gear teeth of the above-described locking plate 624 .

At this time, if the gear teeth of the locking pole 622 and the locking plate 624 are engaged with each other to perform the functions as described above, the structure, shape, material, etc. may vary, and thus the scope of rights is not limited. Accordingly, of course, it may be formed into a shape other than that shown in the drawings and changed to a structure.

The load limiter 10 in which the operation section is adjusted according to the rotational speed of the spool having the configuration as described above may further include a retainer 800 .

The retainer 800 allows the first rotating body 200 and the second rotating body 400 to rotate while being constrained to each other, and the first rotating body 200 and the second rotating body 400 according to preset conditions. By releasing the constraint of the second rotating body 400 can serve to enable free rotation with respect to the first rotating body (200).

In this case, the retainer 800 may include a clutch spring 820 as shown in FIG. 3 .

The clutch spring 820 fixes the first rotating body 200 and the second rotating body 400, and the first rotating body 200 and the second rotating body 400 are fixed by the torque of the first rotating body 200 under a preset condition. It may serve to fix the first rotating body 200 and the second rotating body 400 so that the fixing of the entire 400 is released.

Herein, the torque is described again, immediately after the vehicle collision, the pretensioner P operates to fix one end of the spool S, and the occupant's body is tilted forward by inertia, thereby generating a force. At this time, as the weight of the occupant increases, the torque of the torsion bar T increases. Due to this, the speed at which the torsion bar T is twisted also increases in proportion to the weight of the occupant, so that the speed at which the webbing is pulled out may also be increased.

In summary, the torque of the first rotating body 200 shaft-coupled to the torsion bar T may be increased according to the weight of the occupant.

Therefore, the clutch spring 820 allows the first rotating body 200 and the second rotating body 400 to rotate together by being constrained to each other, and the first rotating body 200, which is variable due to the weight of the occupant, has a predetermined torque or more. When rotated to, that is, when the rotational speed of the first rotating body 200 exceeds a certain speed, it may be provided to be separated from the first rotating body 200 and the second rotating body 400 .

Here, if the clutch spring 820 performs the function as described above, the structure, shape, material, etc. connecting the first rotating body 200 and the second rotating body 400 may be varied, and thus the scope of rights is limited. Of course, it is not limited.

In addition, the retainer 800 may further include a shear pin 840 and a stopping member 860 .

Here, with respect to the function and structure of the shear pin 840 and the stopping member 860 of the retainer 800, the operation process of the load limiter 10 in which the operation section is adjusted according to the rotation speed of the spool according to an embodiment of the present invention It will be described later while explaining.

4 is a first rotational body 200 of the load limiter 10 whose operation section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention is rotated at a predetermined angle due to inertia when the pretensioner P is operated. It is a view showing a state coupled to the spool (S) so that it can rotate, Figure 5 is a first rotating body ( 200) is a view showing a state in which the locking pole 622 is released by rotating the shear pin 840 at a predetermined angle within the spool S due to inertia when the pretensioner P is operated, and the locking pole 622 is released. 6 indicates that the first rotating body 200 and the second rotating body 400 of the load limiter 10 whose operating section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention rotate at different rotational speeds. It is a view showing a state in which the locking pole 622 provided between the first rotating body 200 and the second rotating body 400 is fixed to the locking plate 624 .

Next, referring to FIG. 4 showing the other end of the spool (S) connected to the first rotating body inside the spool (S), when a vehicle crash occurs and the pretensioner (P) is operated, the first The rotating body 200 may be provided to rotate at a predetermined angle within the spool S.

In other words, when the pretensioner (P) operates, one end of the spool (S) to which the pretensioner (P) is connected and the torsion bar (T) rotate in a direction in which the webbing is drawn in, while the spool to which the first rotating body 200 is connected. The other end of (S) may be provided to rotate in the direction in which the webbing is drawn out when the torsion bar (T) starts to be twisted.

Therefore, when the pretensioner (P) is operated, the other end of the spool (S) tries to maintain a stopped state, and the first rotating body 200 to which the torsion bar (T) is connected is the direction in which the webbing is drawn in under the influence of the pretensioner (P). to rotate, the first rotating body 200 rotates at a predetermined angle within the spool (S).

In this case, when the first rotating body 200 is viewed from the outside of the frame F, as shown in FIG. 5, before the pretensioner P operates, the retainer 800 is fixed to the other end of the spool S. The locking pole 622 is inserted into the first rotating body 200 by the provided shear pin 840 and the stopping member 860 and is provided in a fixed state, and then the pretensioner P operates and the first rotation When the entire 200 rotates at a predetermined angle within the spool S, the shear pin 840 is broken and the first rotating body 200 rotates at a predetermined angle, thereby providing an operating space for the locking pole 622. .

Here, if the shear pin 840 and the stopping member 860 can serve to restrain the locking pole 622 before the pretensioner P operates, the formation position and structure, shape, material, etc. may be varied. Of course, the scope of rights is not limited by this.

Next, a state in which the stopper operates according to a preset condition will be described with reference to FIG. 6 .

After the working space of the locking pawl 622 is provided as described above, the second rotating body 400 is constrained to each other by the first rotating body 200 and the clutch spring 820 to retain the retainer 800 at the same rotational speed. can be rotated in

At this time, the second rotation body 400 is released from the clutch spring 820 as the restraint with the first rotation body 200 is released according to a preset condition, and rotates at a rotation speed different from the rotation speed of the first rotation body 200 . By doing so, it can have a difference in rotation speed with the first rotating body 200 .

Therefore, the torsion control unit 600, the locking plate is fixed to the frame (F) when the difference in the rotational speed of the first rotating body 200 and the second rotating body 400 occurs on the locking plate 624. By being fixed, by stopping the rotation of the spool (S) as the rotation of the first rotating body 200 is stopped, it is possible to end the twisting of the torsion bar (T).

Here, in the load limiter 10 in which the operation section is adjusted according to the rotational speed of the spool according to an embodiment of the present invention, the preset condition may be the body condition of the occupant.

Specifically, the physical condition may be the weight of the passenger.

In other words, the rotational speed of the first rotational body 200 may vary according to the weight of the occupant, and when the rotational speed of the first rotational body 200 exceeds the preset rotational speed, the clutch spring 820 is disengaged and The restraints of the first rotating body 200 and the second rotating body 400 are released, and the stopper can be operated.

First, as the body condition of the occupant, when the occupant's weight is less than the preset body weight range, the torsion control unit 600, the first rotating body 200 and the second rotating body 400 do not generate a difference in rotation speed. As a result, the stopper does not operate, and as the spool S continues to rotate, the torsion bar T is continuously twisted.

On the other hand, when the occupant's weight is greater than the preset body weight range, the torsion control unit 600 operates the stopper as a difference in rotation speed between the first rotating body 200 and the second rotating body 400 is generated. Thus, the spool (S) is stopped and the twist of the torsion bar (T) can be released.

In summary, when the first rotational body 200 has a predetermined rotational speed according to the predetermined weight of the occupant, and thus has a predetermined torque, the clutch spring 820 moves between the first rotational body 200 and the second rotational speed. They are separated from the whole 400 and the restraints of each other may be released.

That is, as the weight is smaller than the preset weight, the torsion bar (T) twists time, that is, the load limit time between the occupant and the webbing is lengthened. While preventing occupant injuries from occurring, it is possible to prevent a occupant with a flexible weight from colliding with the front seat or vehicle system.

On the other hand, as the body weight is greater than the preset weight, the torsion bar (T) twisting time, that is, the load limit time between the occupant and the webbing, is shortened, thereby preventing the heavy occupant from colliding with the front seat or vehicle. can do.

The load limiter whose operating section is adjusted according to the rotational speed of the spool of the present invention is provided to adjust the torsion bar twisting time in response to the rotational speed of the spool, so that all ranges of people including solid weight adults are on board. , it is possible to flexibly control the load acting between the occupant and the webbing, and by flexibly controlling the load acting between the occupant and the webbing, it is possible to prevent collisions with the front structures of all ranges of occupants, including adults in solid weight, after buffering. It has the advantage of being able to

As described above, preferred embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments is one of ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

P: pretensioner
S: spool
R: return spring
F: frame
T: torsion bar
10: Load limiter whose operation section is adjusted according to the rotational speed of the spool
200: first rotating body
400: second rotating body
600: torsion control unit
620: stopper
622: locking pole
624: locking plate
800: retainer
820: clutch spring
840: shear pin
860: stopping member

Claims (10)

A load limiter capable of controlling the twisting time of a torsion bar provided on a spool rotatably connected to the inside of the frame,
a first rotating body rotating together with the spool;
a second rotating body rotating at a rotation speed different from that of the first rotating body according to a preset condition; and
By controlling the rotation of the spool according to the difference in the rotational speed of the first rotating body and the second rotating body, comprising a torsion control unit for controlling the torsion of the torsion bar,
The second rotating body,
It is provided with a weight body having a predetermined weight so as to be able to adjust the moment of inertia through the weight, is constrained to each other with the first rotation body and rotates at the same rotation speed, and then rotates at the same rotation speed on the spool according to a predetermined condition in response to the rotation speed on the spool. When the rotational speed of the first rotational body exceeds a certain speed, the constraint with the first rotational body is released and rotates at a rotational speed different from the rotational speed of the first rotational body, thereby having a rotational speed difference with the first rotational body characterized in that
A load limiter whose operating section is adjusted according to the rotational speed of the spool. delete According to claim 1,
The torsion control unit,
The torsion bar is not twisted by stopping the rotation of the spool as the first rotating body and the second rotating body stop the rotation of the first rotating body by a stopper that operates when a difference in rotation speed occurs. characterized in that it ends,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 4. The method of claim 3,
The preset condition is
Characterized in the physical condition of the occupant,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 5. The method of claim 4,
When the occupant's body weight is less than a preset weight range as the occupant's physical condition,
The torsion control unit,
The stopper does not operate as the difference between the rotation speed of the first rotation body and the second rotation body does not occur, and the torsion bar is continuously twisted as the spool continues to rotate,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 5. The method of claim 4,
When the occupant's body weight is greater than a preset weight range as the occupant's physical condition,
The torsion control unit,
The stopper operates as the difference between the rotation speed of the first rotation body and the second rotation body occurs, and the rotation of the spool is stopped to end the twisting of the torsion bar, characterized in that,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 4. The method of claim 3,
The stopper is
a locking plate provided on the outside of the frame and having gear teeth formed on its inner circumferential surface; and
A locking pole provided on the first rotating body so as to be drawn out in an outward direction around the rotating shaft of the first rotating body according to a preset condition and engage with the gear teeth; including,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 8. The method of claim 7,
The locking pole is
Characterized in that it is drawn out along the guide groove provided on the second rotating body and engaged with the gear teeth of the locking plate,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 4. The method of claim 3,
The first rotating body and the second rotating body are constrained to rotate with each other, but by releasing the restraints of the first rotating body and the second rotating body according to a preset condition, the second rotating body is the A retainer that allows free rotation with respect to the first rotating body; further comprising,
A load limiter whose operating section is adjusted according to the rotational speed of the spool. 10. The method of claim 9,
The retainer is
The first rotating body and the second rotating body are fixed while the first rotating body and the second rotating body are fixed so that the fixing of the first rotating body and the second rotating body is released by the torque of the first rotating body under a preset condition; It characterized in that it comprises; a clutch spring for fixing the second rotating body,
A load limiter whose operating section is adjusted according to the rotational speed of the spool.

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