KR101683485B1 - Pre-Tensioner Having Rotating Surpporting member - Google Patents

Abstract

According to an aspect of the present invention, there is provided a pretensioner having a rotation support member capable of more easily engaging with a rack gear. The present invention provides a pretensioner comprising a housing having a housing space, A pinion gear connected to a rotating shaft of the spool to which the webbing is wound and rotated according to the rotation of the spool, a gas generator for generating an explosive force in response to an impact from the outside, one side connected to the gas generator, And a pinion gear which is fixed by the fixed portion in a curved shape so as to be movable within the accommodating space so as to form a part of the arc and is moved by the explosion of the gas generator, And the gear teeth are formed toward the center of the curvature center to rotate the pinion gear And a guide which is formed in the accommodating space and guides the moving path of the recking gear.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pre-tensioner Having Rotating Surpporting member,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner, and more particularly, to a pretensioner having a rotation support member that can be more easily engaged with a rack gear.

When a person is riding on a vehicle or an apparatus, various safeguards are provided in order to prevent the person aboard from colliding with the vehicle or other object from leaving the vehicle or apparatus.

Typically, a seat belt is used to stably fix the lower abdomen and the chest of a person aboard the vehicle or mechanism using the seat belt. However, the degree of collision with the vehicle or with other objects increases beyond the reference level, so that the seat belt often fails to function, and in such a case, the safety of a person aboard the vehicle or apparatus is deteriorated.

Accordingly, various techniques have been developed so that the seat belt performs its function even when the degree of collision with the vehicle or with other objects is large. Among them, Retractor is the technology that is currently attracting attention.

The retractor is provided with a pre-tensioner for increasing the function and effect of the seat belt by introducing a webbing of the seat belt when the vehicle collides with a vehicle or another object, and a pretensioner And an ELR actuating part for locking one side of the spool so as not to be drawn out.

The operation of this pretensioner and the ELR actuating part can be confirmed by a graph expressing the collision performance of the vehicle, that is, a graph showing the load change applied to the occupant's body shown in Fig.

That is, the load change graph R expressing the crash performance of the vehicle shown in FIG. 1 is expressed by a load curve acting on the occupant when the pretensioner is in the preceding operation and a load curve acting on the occupant when the ELR operation portion is performing the following operation , Which confirms the operation of the pretensioner and the ELR actuator.

More specifically, the operation of the pretensioner and the ELR operation unit will be described with reference to FIG.

Generally, the pretensioner operates the piston located in the cylinder using the energy generated when the gas explodes, and the structure associated with the piston is activated as the piston is operated to rotate the spool in the reverse direction, thereby limiting the forward movement of the occupant Lt; / RTI > Therefore, the time-related numerical values shown in FIG. 1 are only displayed for example, and the numerical values for the time are also indicated to be the same for 15 to 25 milliseconds in FIG. - the load acting on the occupant gradually increases as the load curve in the vicinity increases.

However, due to the gas remaining in the cylinder after the gas has exploded in the pretensioner, an overshoot phenomenon occurs.

At this time, the overshoot phenomenon is a phenomenon in which the load sharply increases in the vicinity of 30 [ms] compared with the ideal load change graph (I) indicated by a dotted line in Fig. 1. In more detail, This is because the initial operating load of the load limiter is increased due to the pressure of the gas remaining in the cylinder when the load limiter provided to mitigate the load acting on the passenger after the webbing is locked.

Also, since the operation of the ELR operation portion is delayed due to the structural limit of the retractor after the gas explodes in the pretensioner, a locking deep phenomenon occurs.

At this time, the locking dip phenomenon is a phenomenon in which the load sharply decreases in the vicinity of 20 [ms] with respect to the ideal load change graph (I) indicated by a dotted line in Fig. 1. In more detail, There is a delay between the operation of the pretensioner and the operation of the ELR actuating part because the ELR actuating part is provided adjacent to the other end opposite to the one end of the spool with the pretensioner provided adjacent to one end of the spool It is because there is not.

As described above, when the locking depression phenomenon and the overshoot phenomenon occur sequentially in the operation of the pretensioner and the ELR operation unit, unlike the ideal load change graph I indicated by the dotted line in FIG. 1, the load applied to the body of the occupant A load is applied to the occupant, such as a steeply decreasing or increasing load change graph (R).

If such a suddenly changing load is applied to the occupant, the occupant will be exposed to the risk of unexpected injury, and further research and development is under way to solve such a problem.

Korean Patent No. 10-1261848

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pretensioner which is smaller in size and capable of smoothly transmitting an explosive force of a gas by rotational force, thereby improving operational reliability.

Another problem is to provide a pretensioner capable of minimizing a locking deep phenomenon and an overshoot phenomenon.

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

According to an aspect of the present invention, there is provided a seat belt retractor comprising: a housing having a housing space; a housing provided in the housing space and connected to a rotation shaft of a spool on which a webbing of the seat belt is wound, A gas generator for generating an explosive force in response to an impact from the outside, a conveyance pipe having one side connected to the gas generator and the other side formed with an opening and connected to the accommodating space, And is fixed by the fixed portion in a curved shape so as to form a part of the arc, and is meshed with the pinion gear while being moved by the explosion force of the gas generator, so as to rotate the pinion gear, A formed gear is formed in the accommodating space and guides the moving path of the < RTI ID = 0.0 > It is provided by the pre-tensioner comprising a guide.

A protruding portion formed on one side of an opposing surface of the surface facing the center of curvature of the regulator and being acted upon by the gas generator; a fixed side of a surface of the regulator facing the center of curvature, A first fixing member which is broken by a gear which is moved by a gas generator; a second fixing member which is fixed by the gas generator and is fixed to the other side of the surface facing the center of curvature, A second retaining member for retaining the other end of the surface of the side opposite to the center of curvature at the end of the lever gear to support one end of the lever gear to be rotated toward the pinion gear when pressure is applied to the protrusion by the gas generator, And may further include a support member.

The surface of the lever gear which is in contact with the rotation support member is inclined so as to be inclined toward the center of curvature toward the other end so as to rotate the one end of the lever gear about the center of curvature so that the gear teeth of one end is engaged with the pinion gear, So that the other end of the lever can be pushed out of the center of curvature when the lever gear is moved.

A locker for preventing rotation of the pinion gear when an end of the rack gear is moved between the rack gear and the pinion gear when the rack gear is moved in a direction opposite to the moving direction by the explosion of the gas generator, And a trigger for releasing the locker while being pushed by the rack gear when the rack gear is rotated by the explosive force of the gas generator.

The trigger includes a hinge portion rotatably hinged to the housing at one end thereof, a push portion extending to be pushed by a rack gear moved by the gas generator at the other end, And a stopper which fixes the locker before being pushed by the rack gear and releases the locker when the rack gear is pushed by the rack gear, have.

The rack gear is fixed by the trigger before the rack gear is moved by the gas generator. When the stopper is disengaged from the trigger when the stopper is rotated, the rack gear is protruded by the elasticity of the spring, And the pinion gear.

According to the pre-tensioner equipped with the locker of the present invention, the following effects can be obtained.

First, the rack gear is formed so as to form a part of the arc, and the operation also rotates with the circular arc to rotate the pinion gear, so that the space required for the operation is small and the pretensioner can be made smaller.

Second, since the rack gear can be stably transported along the circular path by the rotation supporting portion, the operational reliability can be greatly improved, and the gear ratio can be further increased as compared with the linear rack gear.

Third, the load drop and the locking deep phenomenon that occur when the rack gear is moved by the recoil can be prevented.

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

The foregoing summary, 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 appended drawings. For the purpose of illustrating the invention, there are shown preferred embodiments in the figures. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
FIG. 1 is a graph showing changes in load applied to a body of a passenger when a conventional retractor for a seat belt is operated; FIG.
2 is a perspective view illustrating a retractor for a seat belt having a pretensioner according to an embodiment of the present invention;
3 is an exploded perspective view showing a connection structure between respective components of a retractor for a seat belt provided with a pretensioner according to an embodiment of the present invention;
4 is a cross-sectional perspective view showing a state in which respective components of the pretensioner of FIG. 3 are coupled;
Fig. 5 is a side view of Fig. 4; Fig.
FIG. 6 is a side view showing a state in which the trigger of FIG. 5 is removed; FIG.
Fig. 7 is a side view showing a state in which the rack gear of Fig. 5 is rotated by the pressure of the ball member; Fig.
Fig. 8 is a side view showing a state in which the rack gear of Fig. 5 is conveyed by the ball member; Fig.
Fig. 9 is a side view showing a state in which the trigger is pushed by pushing the trigger while the rack gear of Fig. 4 is moved, and the rocker protrudes; And,
Fig. 10 is a side view showing a protruding locker of Fig. 9 inserted between the rack gear and the pinion gear; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

FIG. 2 is a perspective view showing a retractor for a seat belt provided with a pretensioner 100 according to an embodiment of the present invention, FIG. 3 is a perspective view showing a retractor for a seat belt having a pretensioner according to an embodiment of the present invention, And FIG.

2 and 3, the retractor 1 for a seat belt includes a frame 10, a spool (not shown) rotatably provided on the frame 10 and configured to wind or loosen a webbing (20).

A cover 12 is provided on one side of the frame 10 and a pretensioner 100 is provided on the other side of the frame 10. The pretensioner 100 includes a housing 110, a pinion gear 170, a gas generator 140, a transfer pipe 130, a ball member 160, and a rack gear 120 .

Referring to FIG. 2, the housing 110 includes a base housing 110a and a cover housing 110b, and an accommodation space S is formed between the base housing 110a and the cover housing 110b. The pinion gear 170 is inserted into the receiving space S through the through hole 112 of the housing 110 while being connected to the rotating shaft of the spool 20.

In this state, the rack gear 120 and the rotary roller 150 are received in the receiving space S, one side of which is connected to the gas generator 140, And is connected to the accommodation space S. A plurality of the ball members 160 are accommodated in the transfer tube 130.

The connection structure between the components has been described above, and each component will be described in more detail below.

As described above, the pretensioner 100 according to the present embodiment includes a housing 110 including a base housing 110a and a cover housing 110b (see Fig. 2), a pinion gear 170, a gas generator 140, a transfer tube 130, a ball member 160 (see FIG. 2), and a rack gear 120.

4 to 6, the pinion gear 170 is provided with a plurality of gear teeth 172 so as to be engaged with the gear teeth 122 formed on the rack gear 120 do.

At this time, the rack gear 120 may be formed to form a part of an arc, and the pinion gear 170 may be positioned at the center of curvature. A gear teeth 172 may be formed on the surface of the rack gear facing the center of curvature.

The gas generator 140 is a component that generates an explosive force in response to an external impact.

One side of the transfer pipe 130 is connected to the gas generator 140 and the other side of the transfer pipe 130 is connected to the accommodation space S by forming an opening 132. A plurality of ball members 160 (see FIG. 2) are provided in the transfer pipe 130 to be transferred to the accommodation space S by an explosive force of the gas generator 140.

That is, when an impact is applied from the outside of the object on which the present pretensioner 100 such as a vehicle is installed, an explosive force is generated by a gunpowder or the like provided inside, and the explosive force is transmitted to the ball member 160 provided in the transfer pipe 130 . Therefore, the ball member 160 can be transferred to the rack gear 120 side of the accommodation space S.

When a certain condition such as an impact is applied, an explosive force may be generated by a gunpowder or the like, and the explosive force may be transmitted to the ball member 160 provided in the transfer pipe 130. Therefore, the ball member 160 can be transferred to the rack gear 120 side of the accommodation space S.

The rack gear 120 is fixed to the accommodation space S by a first fixing member 125 and a second fixing member 126. The rack gear 120 is fixed to the receiving space S by a ball member The first fixing member 125 and the second fixing member 126 are broken by being pushed by the first fixing member 160 so that the rack gear 120 can move.

In addition, a guide 150 for guiding the movement path of the rack gear may be provided in the accommodating space S. The guide 150 may be formed to have an arc shape corresponding to the shape of the rack gear 120.

That is, the rack gear 120 is initially fixed to the accommodation space S without being engaged with the pinion gear 170, and is fixed by the kinetic energy of the ball member 160 due to external impact And is engaged with the pinion gear 170. And the pinion gear 170 can be rotated in the direction in which the webbing is pulled by the residual thrust of the ball member 160. [

The rack gear 120 is protruded to receive pressure from the ball member 160 of the gas generator 140. The protruding portion 124 is formed on one side of a surface of the rack gear 120 facing the center of the radius of curvature .

The first fixing member 125 fixes one side of the rack gear 120 and breaks when the pressure is applied by the gas generator 140 to release the fixing of the rack gear 120 . The first fixing member 125 is formed between the gear teeth 172 on the side facing the center of curvature of the rack gear 120, that is, on the side where the protrusion 124 is formed, Can be fixed.

The second fixing member 126 fixes the other side of the rack gear 120 and is broken when the pressure is applied by the gas generator 140 to release the fixing of the rack gear 120 . The second fixing member 126 may be formed to support and fix the opposite surface of the rack gear 120 facing the center of curvature of the opposite end on the side where the protrusion 124 is formed.

The rotation support member 127 supports the other side of the surface facing the center of curvature of the other end of the rack gear 120 and presses the protrusion 124 of the rack gear 120 by the ball member 160 One end of the rack gear 120 may be supported to rotate to the pinion gear 170 side.

The rack gear 120 is supported by the rotation support member 127 and has an inclined portion 129 protruding obliquely toward the center of curvature toward the center of curvature toward the center of curvature of the other side of the rack gear 120, So that one end of the rack gear 120 is further rotated toward the pinion gear 170. The rack gear 120 and the rack gear 120 are rotatably supported by the pinion gear 170 and the pinion gear 170, respectively.

Meanwhile, the pretensioner 100 according to the present embodiment may include a locker 190 and a trigger 180.

The rack gear 120 is moved by the explosion of the gas generator 140 and can be moved in the opposite direction by recoil at the end after the residual thrust of the ball member 160 due to the explosion of the gas generator 140 disappears, The pinion gear 170 engaged with the rack gear 120 can also be rotated in the opposite direction.

The locker 190 is a component that prevents the rack gear 120 and the pinion gear 170 engaged with the rack gear 120 from moving and rotating in the opposite direction.

The trigger 180 is fixed to the rack gear 120 so that the rack gear 120 is kept stationary before the rack gear 120 is moved by the gas generator 140, And is configured to release the locker 190 when it is rotated by the explosion force of the generator 140.

4 and 5, the trigger 180 may include a hinge portion 182, a push portion 184, a fracture fixing portion 186, and a stopper 188.

The upper end of the hinge portion 182 may be rotatably coupled to the receiving space S of the housing 110. The push portion 184 may be formed at the lower end of the trigger 180 and extended to be pushed by the rack gear 120 moved by the gas generator 140.

The breaker fixing unit 186 fixes the trigger 180 so that the trigger 180 is not rotated until the trigger 180 is pushed by the rack gear 120, 120, it is a component that breaks and releases the fixation.

The stopper 188 fixes the locker 190 until the trigger 180 is pushed and rotated by the rack gear 120 and the trigger 180 is rotated by the rack gear 120 The locker 190 may be disengaged from the locker 190 after being rotated.

The trigger 180 may be disposed to overlap with the locker 190 and the stopper 188 may be formed as a bent piece that is bent toward the locker 190 and protruded.

The locker 190 may be formed with a slit 192 in the form of a groove that can receive the stopper 188 in the form of a bend and maintain a fixed state, The stopper 188 has a longitudinal direction along the movement path of the stopper 188 when the trigger 180 is rotated and the end of the stopper 188 is opened so that the stopper 188 can be released from the slit 192 when the trigger 180 is rotated .

When the rack gear 120 is moved in a direction opposite to the moving direction due to the explosion of the gas generator 140, the rocker 190 is moved between the rack gear 120 and the pinion gear 170 And can be elastically supported by a spring 198, as shown in Fig. 6. As shown in Fig.

A guide chamber 197 for movably receiving the locker 190 and guiding the moving direction of the locker 190 may be formed in the accommodating space S and the locker 190 may be formed in the guide chamber 197). ≪ / RTI >

Before the rack gear 120 is moved by the gas generator 140, the locker 190 is fixed by the trigger 180, and the stopper 188 is rotated by the rotation of the trigger 180, The rack 198 and the pinion gear 170 may protrude out of the guide chamber 197 due to the elasticity of the spring 198 when the fixing of the pinion gear 170 and the rack gear 120 is released.

The locker 190 moves along the moving direction of the rack gear 120 and the pinion gear 170 when the rack gear 120 is moved in the direction opposite to the direction of movement by the gas generator 140 So that it is sandwiched between the rack gear 120 and the pinion gear 170.

The locker 190 may include a support 191, a slit 192, and a catching portion 193, as shown in FIG.

The support portion 191 is a portion elastically supported by the spring 198. The slit 192 may be a portion where the stopper 188 of the trigger 180 is inserted and received as described above.

The catching portion 193 is a component inserted between the rack gear 120 and the pinion gear 170 when the locker 190 protrudes out of the guide chamber 197, 190, respectively.

When the rack gear 120 and the pinion gear 170 move and rotate in the forward direction, the locker 190 is not caught between the rack gear 120 and the pinion gear 170, The rack gear 120 and the pinion gear 170 may be interposed between the rack gear 120 and the pinion gear 170 when the pinion gear 120 and the pinion gear 170 move and rotate in opposite directions.

For this purpose, the locker 190 may protrude in a direction opposite to the forward direction of movement of the rack gear 120.

That is, when the rack gear 120 and the pinion gear 170 are moved forward, the locker 190 is disengaged from the locker 190 as the rack gear 120 is moved forward. However, when the rack gear 120 and the pinion gear 170 are moved in the forward direction, The rocker 190 may be pushed outwardly by the gear teeth 122 and 172 of the pinion gear 170 and the pinion gear 170 so as not to be caught between them.

When the rack gear 120 and the pinion gear 170 are rotated in opposite directions, the engaging portion 193 of the locker 190 is rotated by the gear teeth 172 of the pinion gear 170, The rack gear 120 and the pinion gear 170 can be interrupted between the pinion gear 120 and the pinion gear 170 to stop the movement of the rack gear 120 and the rotation of the pinion gear 170.

6, the cutout portion 193 may include a rupture portion 194, a pinion corresponding portion 195, and a rack gear corresponding portion 196. As shown in FIG.

The rupture portion 194 is formed at a portion of the rack gear 120 which is spaced from the end of the locker 190 and is interposed between the rack gear 120 and the pinion gear 170, And may be formed to be broken by the pressure when it is caught by the gear 170.

A portion of the pinion gear 170 broken by the breaking portion 194 is interposed between the rack gear 120 and the pinion gear 170 to prevent the rotation of the pinion gear 170, have.

The pinion accommodating portion 195 is configured to be in contact with the gear teeth 172 of the pinion gear 170 when the rack gear 120 and the pinion gear 170 are moved and rotated in the forward direction by the gas generator 140 So that the engaging portion 193 of the locker 190 is pushed outwardly of the pinion gear 170.

The rack gear corresponding portion 196 is in contact with the gear teeth 122 of the rack gear 120 which moves in the opposite direction when the rack gear 120 and the pinion gear 170 are moved and rotated in the opposite direction, So that a step may be formed between the rack gear 120 and the pinion gear 170.

Therefore, the rack gear 120 is moved by the pressure of the ball member 160 due to the explosion of the gas generator 140, so that the rack gear 120 pushes the trigger 180 to rotate, The trigger 180 releases the locker 190 and the locker 190 can be projected by the spring 198. [

When the rack gear 120 is moved in the opposite direction by the recoil or the like, the protruded locker 190 is inserted between the gear teeth 122 of the rack gear 120 and the gear teeth 172 of the pinion gear 170 So that it is possible to prevent the pinion gear 170 from rotating in the opposite direction.

The pretensioner of the present embodiment as described above can be operated as follows.

The gas generator 140 generates an explosive force with a gunpowder or the like provided in the interior of the object where the present pretensioner 100 such as a vehicle is installed, The ball member 160 can be transmitted to the ball member 160 to be moved into the receiving space S from inside the transfer tube 130.

5, when the ball member 160 moves into the receiving space S, the ball member 160 meets the protrusion 124 of the rack gear 120 and applies pressure to one end of the rack gear 120 .

At this time, the rack gear is fixed by the first fixing member 125 and the second fixing member 126. When pressure is applied to the protrusion 124 formed at one end of the rack gear 120, A force to rotate the one end of the rack gear toward the pinion gear 170 may be applied to the rack gear with the rotation support member 127 as a center.

7, the first fixing member 125 and the second fixing member 126 are broken while a force is applied to the first fixing member 125 and the second fixing member 126, The rack gear 120 is rotated about the rotation support member 127 so that the gear teeth of the rack gear can be engaged with the gear teeth of the pinion gear.

The rack gear 120 is moved by the ball member 160 so that the rotation support member 127 meets the inclined portion 129 at the other end of the rack gear 120. The inclined portion 129 The other side end of the rack gear 120 is further pushed out of the center of curvature by a tilt of the rack gear 120. At this time, a surface facing the outside of the center of curvature of the rack gear 120 is supported by the guide 150 One end of the rack gear 120 can be further brought into close contact with the pinion gear 170 side.

8, as the pressure of the ball member 160 is continuously applied to the protruding portion 124, the rack gear 120 is moved to the engaged state with the pinion gear teeth 172 Thereby rotating the pinion gear 170.

Therefore, the rack gear 120 can be more strongly engaged with the pinion gear 170, so that the reliability of the teeth can be improved.

Since the rack gear 120 has a circular arc shape and the guide 150 has a circular arc shape corresponding to the shape of the rack gear 120, The area required for the movement relative to the length of the movement path of the rack gear 120 is smaller than that of the linear rack gear, so that the overall size can be further reduced.

At this time, as shown in FIG. 9, when the rack gear 120 is moving, the trigger 180 can be brought into contact with the trigger 180 to push out the trigger 180.

The trigger 180 pushed by the rack gear 120 can be rotated about the hinge portion 182 while the breakage fixing portion 186 is broken.

As the trigger 180 is rotated, the stopper 188 of the trigger 180 moves out of the slit 192 of the locker 190 and the locker 190 is released from the lock, as shown in FIG. 10 The locker 190 with the lock 180 released by the trigger 180 can be protruded from the guide chamber 197 by the spring 198. [

When the rack gear 120 moves in the opposite direction, the rack gear teeth 122 moving in the opposite direction to the rack gear corresponding portion 196 of the locker 190 are hooked, The engaging portion 193 of the locker 190 is inserted between the gear teeth 120 of the rack gear 120 and the gear teeth 172 of the pinion gear 170 The rotation of the rack gear 120 and the pinion gear 170 can be stopped.

Accordingly, the spool 20 connected to the pinion gear 170 is prevented from rotating in the reverse direction, so that load drop and locking deep phenomenon can be prevented.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: pretensioner 110: housing
120: Rack gear 122: Rack gear gear
124: protrusion 125: first fixing member
126: second fixing member 127: rotation supporting member
130: Feed pipe 140: Gas generator
150: Guide 160: Ball member
170: Pinion gear 172: Pinion gear gear
180: Trigger 182: Hinge
186: Fracture fixing portion 188: Slit
190: Rocker 191: Support
192: slit 193:
194: breaking portion 195: pinion counterpart
196: Rack gear correspondence part 197: Guide chamber
198: Spring

Claims (6)

A housing having a receiving space formed therein;
A pinion gear provided in the receiving space and connected to a rotating shaft of a spool to which the webbing of the seat belt is wound and rotated according to the rotation of the spool;
A gas generator for generating an explosive force in response to an external impact;
A conveying pipe having one side connected to the gas generator and the other side formed with an opening and connected to the accommodating space;
And the pinion gear is engaged with the pinion gear while being moved by the gas generator explosive force so as to rotate the pinion gear. A gear having gear teeth toward the center of curvature of the bearing;
A guide formed in the accommodating space and guiding a moving path of the recking gear;
A protrusion formed on one side of an opposing surface of the face of the lever gear facing the center of curvature and under pressure by the gas generator;
A first fixing member which fixes one side of a surface facing the center of curvature of the lever gear and is broken by a gear lever moved by the gas generator;
A second fixing member which fixes the other side of the opposing surface of the face of the ring gear facing the center of curvature and which is broken by the ring gear rotated by the gas generator; And
A rotation support member for supporting the other side of the face of the side end of the lever gear facing the center of curvature and supporting one end of the lever gear to be rotated toward the pinion gear when pressure is applied to the protrusion by the gas generator;
/ RTI > delete The method according to claim 1,
The surface of the lever gear which is in contact with the rotation support member is inclined so as to be inclined toward the center of curvature toward the other end so as to rotate the one end of the lever gear about the center of curvature so that the gear teeth of one end is engaged with the pinion gear, And is configured to push the other side end outward of the center of curvature when the lever gear is moved. The method according to claim 1,
A rocker whose end is interposed between the rack gear and the pinion gear to prevent rotation of the pinion gear when the rack gear is moved in a direction opposite to the moving direction by an explosive force of the gas generator;
A trigger fixed to the rack gear before the rack gear is moved to fix the locker and unlock the locker while being pushed by the rack gear when the rack gear is rotated by the explosion of the gas generator;
/ RTI > 5. The method of claim 4,
The trigger may include:
A hinge portion rotatably hinged to the housing at one end;
A push portion extending on the other end so as to be pushed by a rack gear moved by the gas generator;
A rupture fixing part which fixes the trigger so that the trigger is not rotated before it is pushed by the rack gear and is broken when pushed by the rack gear;
A stopper that fixes the locker before being pushed by the rack gear and releases the locker when pushed by the rack gear;
/ RTI > 6. The method of claim 5,
The rack gear is fixed by the trigger before the rack gear is moved by the gas generator. When the stopper is disengaged from the trigger when the stopper is rotated, the rack gear is protruded by the elasticity of the spring, And a pinion gear.

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