KR102680566B1 - Seat belt retractor - Google Patents

Abstract

It relates to a seat belt retractor, comprising a spindle module including seat belt webbing and a spindle on which the seat belt webbing is wound on an outer surface, wherein an inner wall is formed inside the spindle on which the seat belt webbing is wound on an outer surface. , the inner wall is formed to be narrower than the width of the seat belt webbing wound on the outer surface, and the seat belt webbing is wound and fixed to the outer surface of the inner wall in a curved and deformed shape, and a spindle and a seat belt retractor are provided. By minimizing the installation width, it can be installed stably even in narrow spaces, and the retraction and withdrawal performance of the seat belt webbing can be guaranteed.

Description

Seat belt retractor {SEAT BELT RETRACTOR}

The present invention relates to a seat belt retractor, and more specifically, to a seat belt retractor that prevents seat belt webbing from being pulled out in the event of an emergency situation such as a collision while driving a car.

Generally, vehicles are equipped with seat belt devices on seats to ensure the safety of occupants.

The seat belt device includes a seat belt retractor that operates to wind or withdraw a strip-shaped seat belt webbing (hereinafter referred to as 'webbing') that secures the occupant to a spool, and a tongue fixed to one end of the webbing that is detachable. It consists of a buckle that can be inserted.

The seat belt retractor prevents an occupant wearing a seat belt from being thrown forward or leaving the seat due to driving inertia, etc. during a sudden stop or sudden acceleration due to a vehicle accident, etc. This seat belt retractor allows the webbing to be pulled out under normal conditions when the seat belt is worn, but when a change in the webbing withdrawal acceleration or vehicle inclination is detected due to a vehicle collision, etc., it suppresses further pulling out of the webbing and causes the webbing to become loose. It may include an emergency tensioning device and a pre-tensioning device that reduce sagging, that is, slack.

For example, Patent Document 1 and Patent Document 2 below disclose seatbelt retractor technology that controls the retraction and withdrawal operations of seatbelt webbing.

Such a seat belt retractor may be mounted on a vehicle body, such as a center pillar of a vehicle, a seat backrest, a rear pillar, etc. Accordingly, the mounting posture of the seat belt retractor can be changed in various ways depending on the structure of the center pillar, seat backrest, rear pillar, etc. That is, the seat belt retractor is not always mounted in a horizontal state, and may be mounted tilted at a certain angle from the horizontal state in the left-right direction or in the front-back direction.

Recently, seats installed in vehicles are manufactured to be slim by designing the thickness of the backrest in the front and back directions (hereinafter abbreviated as 'thickness') to be thin. These slim seats are sometimes equipped with an integrated seat belt (Belt In Seat, BIS) device that is integrated with the seat.

In particular, seats used in self-driving cars are being developed so that they can rotate left and right, and the backrest can be rotated backwards up to 180°.

Meanwhile, in the seat belt retractor according to the prior art, the direction of pulling out the webbing is always fixed when it is fixed to the installation target, that is, the backrest of the seat or the car body.

In particular, the seat belt retractor applied to the integrated seat belt device has a spindle installed on the seat back in the left and right directions of the car, that is, parallel to the axial direction of the backrest. As the length of the webbing wrapped around the spindle increases, the seat belt retracts. The front-to-back width of the tractor increases.

For this reason, the seat belt retractor according to the prior art requires a mounting space that provides the width when the webbing is wound around the spindle at its maximum, which can be a factor that makes it difficult to slim the seat.

Therefore, there is a need for the development of seat belt retractor technology that can be applied even in cases where the mounting space for the seat belt retractor is limited, such as a slim seat, and can guarantee the retraction and withdrawal performance of the webbing.

U.S. Patent No. 6,499,554 (registered on December 31, 2002) U.S. Patent No. 6,443,382 (registered on September 3, 2002)

The purpose of the present invention is to solve the problems described above and to provide a seat belt retractor that minimizes the space required for installation and ensures the retraction and retraction performance of the seat belt webbing.

Another object of the present invention is to provide a seat belt retractor that can minimize the longitudinal width of the spindle by forming a narrow width of the spindle around which the seat belt webbing is wound compared to the width of the seat belt webbing.

Another object of the present invention is to provide a seat belt retractor that can guarantee the retraction and withdrawal performance of the seat belt webbing by guiding the position where the seat belt webbing is wound around the spindle.

In order to achieve the above-described object, the seat belt retractor according to the present invention includes a spindle module including seat belt webbing and a spindle on which the seat belt webbing is wound on the outer surface, and the inside of the spindle has the outer surface of the spindle. An inner wall around which the seat belt webbing is wound is formed, and the inner wall is formed to be narrower than the width of the seat belt webbing wound on the outer surface, so that the seat belt webbing is wound and fixed in a curved shape on the outer surface of the inner wall. It is characterized by

As described above, according to the seat belt retractor according to the present invention, the length of the spindle on which the seat belt webbing is wound is minimized, and the seat belt webbing is first wound and installed on the spindle in a curved deformed state, thereby installing the seat belt. By reducing the installation space where the retractor is installed, the effect of being able to install the seat belt retractor stably even in a narrow space is achieved.

According to the present invention, both ends of the torsion bar coupled inside the spindle are respectively press-fitted to the spindle disk and the spindle gear to improve the coupling force between the spindle and the spindle disk, so that the curved seat belt webbing is stretched by the force The effect is obtained of preventing the coupling between the spindle and the spindle disk from being released.

In addition, according to the present invention, by forming an internal wall inside the spindle and installing the spindle webbing by first winding it around the outer peripheral surface of the internal wall, the torsion bar and the seat belt webbing are prevented, and the torsion bar due to contact with the seat belt webbing is prevented. This has the effect of preventing operation errors and damage or breakage of the seat belt webbing.

In addition, according to the present invention, by forming one or more step surfaces on the outer peripheral surface of the spindle in a position close to the webbing take-out hole and disposing the sewing portion provided at one end of the seat belt webbing, the seat belt webbing can then be smoothly wound or unwound without steps. The effect that there is is obtained.

In addition, according to the present invention, by forming the spindle disk with an outer diameter larger than the spindle to guide the initial winding position of the seat belt webbing, the effect of effectively controlling the alignment of the seat belt webbing wound around the spindle is obtained. .

As a result, according to the present invention, the installation width of the spindle and the seat belt retractor can be minimized to enable stable installation even in a narrow space, and the effect of ensuring the retraction and withdrawal performance of the seat belt webbing is obtained.

1 is a view showing a seat belt retractor installed on the backrest of a seat in a preferred embodiment of the present invention;
Figure 2 is a perspective view of a seat belt retractor according to a preferred embodiment of the present invention;
Figure 3 is a partially exploded perspective view of the spindle module shown in Figure 2;
Figure 4 is an exploded perspective view of the spindle module shown in Figure 3;
Figure 5 is a cross-sectional view taken along line AA' shown in Figure 3;
Figure 6 is a cross-sectional view taken along line BB' shown in Figure 3.

Hereinafter, a seat belt retractor according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Hereinafter, the direction toward which the steering wheel is facing based on the vehicle's seat is referred to as 'forward (F)', and the opposite direction is referred to as 'rear (B)'. And terms indicating directions such as 'left (L)', 'right (R)', 'upward (U)' and 'downward (D)' are based on the front (F) and back (B) above. It is defined as indicating each direction.

In this embodiment, the configuration of a seat belt retractor applied to an integrated seat belt (Belt In Seat, BIS) device integrated into the backrest of the seat is described, but the present invention is not necessarily limited thereto.

In other words, it should be noted that the present invention can be modified to enable installation in various locations such as the backrest of the seat, as well as the car body, such as a pillar disposed on the side of the car body, a car body panel behind the seat, and the roof or floor of the car body.

First, with reference to Figure 1, the configuration of a seat belt device to which a seat belt retractor according to a preferred embodiment of the present invention is applied will be described in detail.

Figure 1 is a diagram showing a seat belt retractor installed on the backrest of a seat in a preferred embodiment of the present invention.

Figure 1(a) shows a front view of a seat equipped with a seat belt retractor, and Figure 1(b) shows a rear view of a seat equipped with a seat belt retractor.

As shown in FIG. 1, the seat belt device 100 is mounted on a strip-shaped seat belt webbing (hereinafter referred to as 'webbing') 21 that secures the occupant, and the backrest 12 of the seat 11, so that it can be used when necessary. It includes a seat belt retractor 10 for winding the webbing 21, a belt tongue 110 installed on the drawn end of the webbing 21, and a buckle 120 to which the belt tongue 110 is detachably coupled. .

A mounting space 13 in which the seat belt retractor 10 is mounted may be provided on the backrest 12 of the seat 11.

The mounting space 13 is provided inside the backrest 12, and a guide member 14 is installed on one side of the mounting space 13 to guide the webbing pulled out from the spindle module 20 to the outside of the backrest 12. It can be.

The mounting space 13 may be provided at the rear upper part of the backrest 12.

Of course, in Figure 1, the mounting space 13 is shown approximately at the center of the upper part of the backrest 12, but the present invention is not necessarily limited thereto, and is located at a certain distance downward from the upper end of the backrest 12. It may be formed, or may be formed deviated from the center of the backrest 12 to the left or right.

Additionally, the mounting space 13 may be provided in various locations on the vehicle body, such as a pillar, a vehicle body panel behind a seat, or the ceiling or floor of the vehicle body.

In this embodiment, a space in which the webbing 21 pulled out from the seat belt retractor 10 is disposed toward the guide member 14 may be in communication with one side of the mounting space 13 .

When applied to the top of one side of the backrest 12, for example, the driver's seat 11, the guide member 14 may be provided to partially cover the upper left side and the edge of the upper right side of the backrest 12.

Here, the webbing 21 is wrapped around the spindle 22 with both ends facing in the front-back direction, and is positioned on the backrest through the mounting space 13 and the arrangement space 15 where the drawn-out webbing 21 is changed and arranged at various angles. (12) It is pulled out to the outside, and the pulling direction can be changed by the guide member 14 so that both ends face approximately left and right directions.

For this purpose, the webbing 21 has an autonomous webbing adjuster 211 whose withdrawal direction and withdrawal angle are adjusted between the mounting space 12 provided on the backrest 12 and the guide member 14 installed on the upper end of the backrest 12. ) may include.

That is, the autonomous webbing adjusting unit 211 is positioned between the spindle 22 and the guide member 14, that is, in the front-to-back direction within the arrangement space 15, so that both ends are oriented in the left-right or up-down direction. The direction in which the tractor 10 is pulled out is changed.

In addition, the autonomous webbing adjusting unit 211 adjusts the angle and direction drawn from the spindle 22 toward the guide member 14 depending on the position of the guide member 14, and the webbing 21 is adjusted to the seat 11. The angle and direction of the belt drawn from the backrest 12 toward the belt tongue 110 can be adjusted.

Next, the configuration of a seat belt retractor according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

Figure 2 is a perspective view of a seat belt retractor according to a preferred embodiment of the present invention, and Figure 3 is a partially exploded perspective view of the spindle module shown in Figure 2.

In this embodiment, as shown in FIG. 2, the configuration of the seat belt retractor installed on the driver's seat side is described. However, the seat belt retractor according to the present invention can be applied not only to the driver's seat side but also to the passenger seat side without changing the configuration. It should be noted that this may occur.

The seat belt retractor 10 according to a preferred embodiment of the present invention is manufactured by modularizing each component applied to the seat belt retractor 10 for each functional block and selectively combining each modularized component.

For example, as shown in FIGS. 2 and 3, the seat belt retractor 10 includes a spindle module 20 including a spindle around which webbing is wound, and changes in the tilt of the vehicle and the withdrawal acceleration of the webbing 21. It can be assembled by selectively combining a sensor module 30 that detects a sensor module 30 and an emergency tensioning module 40 that reduces slack by winding the webbing 21 in the event of an emergency situation such as a car crash.

The seat belt retractor (10) is equipped with a pre-tensioning module (50) and an additional function module that smoothly withdraws the webbing (21) during normal driving of the vehicle and reduces slack by winding the webbing (21) just before an emergency occurs. It may also be included.

The spindle module 20 and the sensor module 30 are basic modules that make up the seat belt retractor 10, and may be manufactured and assembled as separate modules, or may be integrated into one module.

The sensor module 30 and the emergency tensioning module 40 may be placed on the right side of the spindle module 20, and the pre-tensioning module 50 may be placed below the spindle module 20.

Alternatively, the pre-tensioning module 50 is disposed on the left or right side of the spindle module 20, and the sensor module 30 and the emergency tensioning module 40 are connected to the spindle module 20 and the pre-tensioning module 50. It may be placed below or above.

Additionally, the seat belt retractor 10 may be assembled by excluding some of the above-mentioned modules or combining additional functional modules as necessary, such as the specifications of the vehicle and the specifications of the seat belt retractor 10.

In Figure 3, the spindle module 20 is provided with a spindle 22 on which webbing 21 is wound on the outer surface.

The spindle module 20 may operate to wind the webbing 21 when a change in the withdrawal acceleration of the webbing 21 or a change in the inclination of the vehicle is detected by the sensor module 30 in the event of an emergency situation such as a vehicle collision.

This spindle module 20 may be combined with the sensor module 30 to further provide a function of only retracting the webbing 21 in a certain section to secure a child seat.

Hereinafter, the direction in which the webbing 21 is drawn is assumed to be upward (U), and the direction in which the spindle 22 is installed is assumed to be the front-to-back direction (F, B).

In this embodiment, in order to be mounted on a slimmed down seat, the thickness of the seat belt retractor 10, that is, the front-to-back width, is minimized.

Each module is arranged around the spindle module 20 on the side of the spindle module 20, that is, on the left or right side, or on the top or bottom of the spindle module 20.

For example, a sensor module 30, an emergency tensioning module 40, and a pre-tensioning module 50 may be disposed on top of the spindle module 20, respectively.

Here, the spindle module 20 and the sensor module 30 are basic modules constituting the seat belt retractor 10, and may be integrated into one module or manufactured and assembled as separate modules.

And the emergency tensioning module 40 and the pre-tensioning module 50 may be placed on one side of the basic module, for example, at the top.

Each module combined in this way is installed side by side or at a right angle so that the axis provided in each module faces the same direction as the direction in which the spindle 22 is installed, and transmits or transmits power through a power transmission unit such as a gear. It is designed to be delivered.

For example, the axes provided in the emergency tensioning module 40 and the pre-tensioning module 50 are each arranged in parallel with the spindle 22, and the output shaft of the drive motor and the sensor provided in the pre-tensioning module 50 The axis provided in the module 30 may be arranged along the left and right directions so as to be perpendicular to the spindle 22.

Meanwhile, as shown in FIG. 3, first and second brackets 23 and 24 that are coupled to each other and function as the housing 23 may be coupled to the front and rear sides of the spindle module 20, respectively. In addition, a pull-out space 25 into which the webbing 21 is pulled out may be provided on one side of the first and second brackets 23 and 24, that is, at the lower left side.

The first bracket 23 may be placed on the front side of the spindle module 20, and the second bracket 24 may be placed on the rear side of the spindle module 24.

The first bracket 23 may be formed in a substantially disk-shaped or polygonal-plate shape to correspond to the front surface of the spindle module 20.

The second bracket 24 may be formed in a substantially circular or polygonal ring shape to correspond to the rear surface of the spindle module 24. That is, an installation hole 241 may be formed in the center of the second bracket 24 into which the spindle gear 74, which will be described below, is installed. And, an elastic module 26 that provides elastic force to the spindle 22 may be coupled to the rear of the second bracket 24.

The pull-out space 25 is provided with a webbing guide 60 that guides the webbing being drawn into or pulled out from the spindle 22, and a pair of guide frames are provided at the top and bottom of the pull-out space 25, respectively. (26) is provided, and a bracket coupling portion (28) coupled to the second bracket (24) may be provided at the rear end of each guide frame (26).

The bracket coupling portion 28 may be formed in a substantially circular or polygonal ring shape to correspond to the cross-sectional shape of the second bracket 24. That is, an installation hole 281 in which the spindle gear 74 is installed may be formed in the center of the bracket coupling portion 28.

A connecting member 29 formed in a substantially ring shape or arc shape with one side open may be disposed between the bracket coupling portion 28 and the second bracket 24.

Each guide frame 27 extends rearward from the first bracket 23, and a bracket coupling portion 28 may be connected to the rear end of the guide frame 26.

The bracket coupling portion 28 is firmly connected to the second bracket 24 in various ways such as bolting or welding using a plurality of fastening protrusions that protrude outward while the edges of the second bracket 24 are in contact with each other. can be combined

A pair of guide frames 26 may provide a stopper function that limits the maximum angle at which the webbing guide 60 can rotate upward and downward.

Next, the configuration of the spindle module will be described in detail with reference to FIGS. 3 to 6.

FIG. 4 is an exploded perspective view of the spindle shown in FIG. 3, FIG. 5 is a cross-sectional view taken along line A-A' shown in FIG. 3, and FIG. 6 is a cross-sectional view taken along line B-B' shown in FIG. 3.

As shown in FIGS. 3 to 6, the spindle module 20 includes the webbing 21 and the spindle 22, a torsion bar 71 installed inside the spindle 22, and a rigidity of the spindle 22. It may include a reinforcing member 72 for reinforcing and a spindle disk 73 and a spindle gear 74 disposed on both sides of the spindle 22, that is, at the front and rear ends, respectively.

The spindle 22 is formed in a substantially cylindrical shape with an opening on the front when viewed from one side of FIG. 4, and one end of the webbing, a torsion bar 71, and a reinforcing member 72 can be coupled to the inside of the spindle 22. .

A spindle disk 73 may be coupled to the open front of the spindle 22, and a spindle gear 74 may be disposed on the rear of the spindle 22.

In detail, a first coupling space 221 is provided in a substantially cylindrical shape so that the torsion bar 71 can be coupled to the inside of the spindle 22, and a webbing 22 is provided outside the first coupling space 221. The second coupling space 222 may be provided in a substantially cylindrical shape so that the reinforcing member 72 is coupled with one end connected. The first coupling space 221 and the second coupling space 222 may be separated by an internal wall 223 formed in a substantially cylindrical shape inside the spindle 22. Here, the inner wall 223 may function to prevent contact between the webbing 21 and the torsion bar 71.

That is, one end of the webbing 21 is fixed to the rear portion at a certain distance by sewing while wrapping the inner wall 223. Hereinafter, the rear portion sewn with one end of the webbing 21 is referred to as the sewing portion 212.

On one side of the spindle 22, at the lower left side as seen in FIG. 4, a webbing withdrawal hole 221 through which the webbing 21, one end of which is fixed, is pulled out to the outside of the spindle 22 may be formed.

And, on the outer peripheral surface of the spindle 22, one or more step surfaces ( 225) can be formed.

For example, first and second step surfaces 226 and 227 having different heights may be provided on the outer peripheral surface of the spindle 22. That is, the first step surface 226 is formed on the spindle 22 so that the sewing portion 212 of the webbing 21 sewn at the position connected to the webbing draw-out hole 224 can be smoothly drawn out to the outside of the spindle 22. ) may be provided at a lower height than the outer peripheral surface and the second step surface 227, that is, with an outer diameter smaller than the outer diameter of the spindle 22. The second step surface 227 has a height lower than the outer peripheral surface of the spindle 22, that is, the outer diameter of the spindle 22, so that the sewing portion 212 of the webbing 21 is fixed at a position connected to the first step surface 226. It can be provided with a smaller outer diameter.

Accordingly, the webbing 21 is fixed to the outside of the spindle 22 through the webbing outlet hole 224 while wrapped around the inner wall 223 once and fixed in the sewing unit 212 by sewing. The portion 212 is fixed to the stepped surface 225 formed on the outer peripheral surface of the spindle 22. Therefore, the webbing 21 can be smoothly wound or unwound without any steps during the continuous winding process around the spindle 22.

The torsion bar 71 is installed inside the spindle 22 and may function to limit the load acting on the spindle 22. For example, the torsion bar 71 is provided as a high level load limiter that provides a relatively large high load to the spindle 22 when the occupant seated in the seat is a relatively heavy adult male. It can be.

This torsion bar 71 is formed in a cylindrical shape with a roughly circular cross-section, and first and second gear parts 711 and 712 are formed with a plurality of protrusions protruding outward on the outer peripheral surfaces of the front and rear ends of the torsion bar 71, respectively. ) can be provided.

The reinforcing member 72 is formed in a substantially cylindrical shape with openings at both ends, and on one side of the reinforcing member 72, at the lower part as seen in FIG. 4, webbing 21 connected to the torsion bar 71 coupled to the inside is provided as a reinforcing member. (72) The opening hole 721 may be formed to extend long along the longitudinal direction of the reinforcing member 72 so as to be pulled outward.

The spindle disk 73 is formed in a substantially disk shape, is coupled to the front end of the torsion bar 71 and the reinforcing member 72, and functions to shield the front of the spindle 22.

For this purpose, a coupling cylinder portion 731 to which the first gear portion 711 at the front end of the torsion bar 71 is coupled is provided at the rear of the spindle disk 73, and a reinforcing member 72 is provided on the outside of the coupling barrel portion 731. A plurality of coupling holes 732 in which the plurality of protruding portions 722 protruding from the front end are coupled may be formed.

Therefore, the reinforcing member 72 functions to transmit force by connecting the spindle disk 73 disposed on the front side with the rear end of the spindle 22. To this end, a plurality of protrusions 722 may be formed at the rear end of the reinforcing member 72, and a coupling hole through which the plurality of protrusions 722 are coupled may be formed at the rear end of the spindle 22.

The coupling cylinder portion 731 may be formed to have a substantially cylindrical shape and protrude rearward from the back of the spindle disk 73.

A plurality of protrusions that engage with the first gear portion 711 of the torsion bar 71 may be formed on the inner peripheral surface of the coupling cylinder portion 731.

That is, the spindle disk 73 is coupled to the front end of the torsion bar 71 through the coupling cylinder portion 731, and can transmit the rotational force of the torsion bar 71 to the reinforcing member 72.

Meanwhile, the spindle disk 73 may be rotatably connected to the first bracket 23.

For this purpose, a connecting bearing 75 is coupled to the central portion of the spindle disk 73, and a coupling rib 231 to which the connecting bearing 75 is rotatably coupled may be provided at the rear of the first bracket 23. .

The coupling rib 231 is formed in a substantially cylindrical shape, and a bearing 76 that reduces friction is coupled to the inside of the coupling rib 231 so that the spindle disk 73 and the connecting bearing 75 can rotate smoothly. It can be.

The connection bearing 75 is formed in a substantially disk shape, and a groove 751 may be formed concavely in the center to engage the protrusion 762 protruding from the rear of the bearing 76 on the front of the connection bearing 75. there is.

The bearing 76 is formed in a substantially cylindrical shape with an outer diameter corresponding to the inner diameter of the coupling rib 231 so that it can be coupled to the inside of the coupling rib 231, and a first bracket 23 is installed at the front end of the bearing 76. A shaft portion 761 that penetrates and functions as a rotating shaft may be formed to protrude. In addition, a protrusion 762 coupled to the groove portion 751 of the connecting bearing 75 may be formed to protrude at the rear end of the bearing 76.

Therefore, the spindle 22, the torsion bar 71, the reinforcing member 72, the spindle disk 73, and the connecting bearing 75 can rotate around the shaft portion 761 formed at the front end of the bearing 76. .

In this way, during the rotation of each part provided in the spindle module 20 and in the process of blocking the rotation by driving the emergency tensioning module 40, a certain force is applied to each part, and the bearing 76 is 1 The force can be transmitted to the first bracket 23 and distributed through the spindle disk 73 connected to the coupling rib 231 of the bracket 23.

Meanwhile, the spindle gear 74 engages with the drive gear provided in the emergency tensioning module 40 to rotate the spindle 22 by the operation of the emergency tensioning module 40 or to stop the rotation operation. do.

This spindle gear 74 is formed in a substantially disk shape, and a plurality of teeth may be formed on the outer peripheral surface of the spindle gear 74 to engage with a plurality of teeth formed on the drive gear.

And, on the front of the spindle gear 74, a coupling cylinder portion 741 is provided to which the second gear portion 712 at the rear end of the torsion bar 71 is coupled, and on the rear side of the spindle gear 74, the front of the elastic module 26 is provided. An insertion space 742 into which the side portion is inserted may be provided.

Here, the spindle gear 74 may have a structure in which the outer peripheral surface on which the plurality of teeth is formed protrudes on both sides, that is, toward the front and rear. That is, a coupling surface 743 protruding in the front-back direction may be formed on the outer peripheral surface of the spindle gear 74 to be coupled to the installation holes 281 and 241 formed in the bracket coupling portion 28 and the second bracket 24, respectively. . Therefore, when a force of a certain magnitude or more is applied to the spindle gear 74 in the direction of moving the spindle gear 74 outward while the coupling surface 743 is coupled to each of the installation holes 281 and 241, this force is coupled to the bracket. It has the function of being distributed by transferring it to the part 28 and the second bracket 24.

The coupling cylinder portion 741 is formed in a substantially cylindrical shape with front and rear openings, and a plurality of protrusions that engage with the second gear portion 712 of the torsion bar 71 may be formed on the inner peripheral surface of the coupling cylinder portion 741. there is.

Here, the spindle shaft 77, which functions as the rotation axis of the spindle gear 74, may be coupled to the rear of the coupling cylinder portion 741.

The spindle shaft 77 is formed in a substantially disk shape with an open rear surface, and a protrusion 771 on the front surface of the spindle shaft 77 is formed with a plurality of protrusions corresponding to the plurality of protrusions formed on the inner peripheral surface of the coupling cylinder portion 741. can be prepared. In addition, a locking portion 772 may be provided on the rear side of the spindle shaft 77 by which one end of the elastic member 261 provided inside the elastic module 26 is caught and fixed.

For example, the elastic module 26 is a band-shaped elastic member 261 wound in a spiral shape, and a pair of housings 262 are coupled to each other at the front and rear sides of the elastic member 261 to form an elastic member ( 261).

Here, one end of the elastic member 261, as seen in FIG. 3, may be bent into a ring shape so that the inner end is caught by the locking portion 772 formed on the spindle shaft 77.

And the other end, that is, the outer end, of the elastic member 261 is formed to be curved in a ring shape so as to be caught by a locking protrusion formed on the back of one of the pair of housings 262, for example, the housing 262 disposed on the front side. You can.

Therefore, the elastic member 261 can be elastically deformed so that its length decreases or increases depending on the rotation direction of the spindle shaft 77, thereby providing elastic force to the spindle shaft 77.

To this end, the locking portion 772 may include a protrusion that functions as the axis of the spindle gear 74 and one or more locking ribs that are radially curved around the protrusion.

Next, a method of assembling a seat belt retractor according to a preferred embodiment of the present invention will be described in detail.

First, the worker wraps one end of the webbing 21 around the inner wall 223 inside the spindle 22 once and then sews it to form the sewing portion 212.

The sewing portion 212 is pulled out to the outside of the spindle 22 through the webbing pull-out portion 224, and is then placed and fixed on the first and second step surfaces 226 and 227 formed on the outer peripheral surface of the spindle 22.

A torsion bar 71 and a reinforcing member 72 are respectively coupled to the first and second coupling spaces 221 and 222 inside the spindle 22, and spindle disks ( 73) and the spindle gear 74 are combined.

At this time, the first and second gear parts 711 and 712 provided at the front and rear ends of the torsion bar 71 are respectively connected to the coupling tube part 731 of the spindle disk 73 and the coupling tube part 741 of the spindle gear 74. Each is combined.

And the protrusions 712 formed at the front and rear ends of the reinforcing member 72 are respectively coupled to the plurality of coupling holes 732 formed in the spindle disk 73 and the plurality of coupling holes formed at the rear end of the spindle 22.

A connecting bearing 75 coupled to the bearing 76 installed on the coupling rib 231 of the first bracket 23 is coupled to the front of the spindle disk 73, and the spindle shaft 77 is attached to the rear of the spindle gear 74. ) are combined.

Next, first and second brackets 23 and 24 are respectively coupled to the front and rear sides of the assembled spindle module 20, and an elastic module 26 is mounted on the rear end of the second bracket 24.

At this time, a connecting member 29 is coupled between the second bracket 24 and the bracket coupling portion 28 connected to the first bracket 23 and the guide frame 27. Therefore, the connecting member 29 shields the remaining area except the area where the spindle gear 74 and the drive gear are engaged.

Then, the sensor module 30, emergency tensioning module 40, pre-tensioning module 50, and additional function module are sequentially assembled based on the spindle module 20.

The seat belt retractor 10 assembled through this process is mounted on an object such as the backrest 12 of the seat 11 or a body panel, and when an emergency situation such as a collision occurs during the driving process of the car, the webbing The withdrawal operation of (21) is suppressed to restrain the occupants and protect them safely.

Meanwhile, in this embodiment, the front-to-back length (l) of the spindle 22 is made shorter than the front-to-back length (L) of the webbing in order to minimize the front-to-back width of the seat belt retractor 10 (l< L). Therefore, the webbing 21 may be wound while being partially bent and deformed during the initial winding process around the spindle 22.

For this purpose, the anteroposterior length (l) of the second coupling space 222 where the webbing 21 is first wound inside the spindle 21 is the anteroposterior length (L) of the webbing 21, as shown in FIG. ) can be formed shorter than that.

Of course, the length of the torsion bar 71 inside the spindle 22, the first coupling space 221 where the torsion bar 71 is press-fitted, and the internal wall 223 are also related to the internal space of the spindle 22, that is, It is formed with a length (l) corresponding to the front-to-back length (l) of the second coupling space 222.

In addition, the height of the second coupling space 222 may be formed to be large, that is, high, compared to the thickness of the webbing 21 so that the webbing 21 can be curved and deformed.

Here, both ends of the webbing 21 are pressed toward the center by the spindle disk 73 and the rear end wall of the spindle 22, which are respectively coupled to the front end of the spindle 22 and the reinforcing member 72.

Accordingly, the webbing 21 is bent and deformed by force applied from both ends.

Of course, FIG. 5 shows only both ends of the webbing 21 being bent and deformed. However, the webbing 21 may be deformed not only at both ends but also one or more parts such as the center, or may be deformed to be curved as a whole.

Here, the difference in the front-to-back length of the second coupling space 222 formed between the webbing 21 and the spindle 22 can be set to a preset length based on the front-to-back length of the webbing 21 according to international standards. .

For example, the set length may be set to about 1 mm to 10 mm.

Of course, the present invention is not necessarily limited to this, and the length and height of the space inside the spindle 22 in the front-back direction can be variously changed depending on the specifications of the mounting space 13 where the seat belt retractor 10 is mounted. .

In this way, the present invention minimizes the length of the spindle around which the seat belt webbing is wound, and allows the seat belt webbing to be initially wound and installed on the spindle in a curved and deformed state.

Accordingly, the present invention reduces the mounting space in which the seat belt retractor is mounted, allowing the seat belt retractor to be stably mounted even in a narrow space.

Meanwhile, the curvedly deformed webbing 21 tries to unfold to its original unfolded shape.

Therefore, a force that causes the webbing 21 to unfold is applied to the spindle disk 73, which presses both ends of the webbing 21, and the rear end wall of the spindle 22, respectively.

In this way, the coupling force between the spindle 22 and the spindle disk 73 may be weakened by the force with which the webbing 21 tries to unfold.

To solve this problem, in this embodiment, the torsion bar 71 is firmly coupled to the inside of the spindle 22 by press-fitting.

That is, the first gear portion 711 of the torsion bar 71 is press-fitted into the coupling cylinder portion 731 of the spindle disk 73. And the second gear portion 712 of the torsion bar 71 is press-fitted into the coupling cylinder portion 741 of the spindle gear 74 coupled to the rear side of the spindle 22.

In this way, the present invention fixes the spindle and the spindle disk by press-fitting both ends of the torsion bar coupled inside the spindle to the spindle disk and spindle gear, respectively.

Accordingly, the present invention improves the coupling force between the spindle and the spindle disk, thereby preventing the coupling between the spindle and the spindle disk from being released due to the force that tries to straighten the curved deformed seat belt webbing.

Additionally, in this embodiment, the webbing 21 is wound once around the outer peripheral surface of the inner wall 223 provided inside the spindle 22 and then pulled out to the outside of the spindle 22 through the webbing outlet hole 224.

Therefore, the inner wall 223 prevents the webbing 21 and the torsion bar 71 from contacting each other.

In this way, the present invention forms an internal wall inside the spindle, and installs the spindle webbing by first winding it around the outer peripheral surface of the internal wall, thereby preventing the torsion bar and the seat belt webbing from interfering with each other, and preventing the torsion bar from moving due to contact with the seat belt webbing. It can prevent errors and damage or breakage of seat belt webbing.

Additionally, in this embodiment, one or more stepped surfaces 225 are formed on the outer peripheral surface of the spindle 22.

After the webbing 21 is wrapped around the inner wall 223 once, the portion overlapping with one end of the webbing 21 is connected to each other by sewing, and a sewing portion 212 is formed in the connected portion. This sewing portion 212 is disposed on one or more step surfaces 225 formed on the outer peripheral surface of the spindle 22, for example, the first and second step surfaces 226 and 227.

That is, the webbing 21 wraps the inner wall 223 once, is fixed in the sewing unit 212 by sewing, and is pulled out to the outside of the spindle 22 through the webbing outlet hole 224, and is sewn. The portion 212 is fixed to the stepped surface 225 formed on the outer peripheral surface of the spindle 22. Therefore, the webbing 21 can be smoothly wound or unwound without any steps during the subsequent winding process on the spindle 22.

In this way, the present invention forms one or more step surfaces on the outer peripheral surface of the spindle in a position close to the webbing take-out hole and arranges the sewing portion provided at one end of the seat belt webbing, so that the seat belt webbing can be wound or unwound smoothly without steps. .

Additionally, in this embodiment, the spindle disk 73 is formed with an outer diameter larger than that of the spindle 22. Therefore, the edge portion of the spindle disk 73 protrudes outward from the outer surface of the spindle 22 when coupled to the front end of the spindle 22.

In this way, the edge portion of the spindle disk 73 that protrudes from the outer surface of the spindle 22 guides the initial position of the webbing 21 in the process of winding the webbing 21 around the spindle 21.

That is, the shear of the webbing 21 drawn out of the spindle 22 through the webbing withdrawal hole 224 formed in the spindle 22 is caused by the edge portion of the spindle disk 73 in the process of being wound around the spindle 22. As the winding position is guided, it can be wound aligned at a certain position. Here, the winding position of the rear end of the webbing 21 may be guided by a spindle gear 74 having a larger outer diameter than the spindle 22.

As such, the present invention forms a spindle disk with a larger outer diameter than the spindle to guide the initial winding position of the seat belt webbing, thereby effectively controlling the alignment of the seat belt webbing wound around the spindle.

As a result, the present invention minimizes the installation width of the spindle and seat belt retractor, allows for stable installation even in a narrow space, and ensures the retraction and withdrawal performance of the seat belt webbing.

Although the invention made by the present inventor has been described in detail according to the above-mentioned embodiments, the present invention is not limited to the above-described embodiments and, of course, can be changed in various ways without departing from the gist of the invention.

That is, although the configuration of the integrated seat belt device integrated with the backrest of the seat was described in the above embodiment, the present invention covers not only the backrest of the seat, but also the vehicle body, such as a filler disposed on the side of the vehicle body, a vehicle body panel on the rear of the seat, and the vehicle body. It can be modified to be installed in various locations such as the roof or floor.

The present invention is applied to seatbelt retractor technology that minimizes the installation width of the spindle and seatbelt retractor so that it can be installed even in a narrow space and guarantees the retraction and withdrawal performance of the seatbelt webbing.

1: Seat belt device
2: Webbing 3: Seat belt retractor
4: Belt tongue 5: Buckle
6: spindle
10: Seat belt retractor
11: Seat 12: Backrest
13: Mounting space 14: Guide member
15: Layout space
20: Spindle module
21: Webbing 211: Autonomous webbing adjustment unit
212: Sewing department
22: spindle
221,222: first and second combined spaces 223: internal wall
224: Webbing draw-out hole 225: Step surface
226,227: 1st and 2nd step surfaces
23: first bracket 231: coupling rib
24: second bracket 241: installation hole
25: Drawout space 26: Elastic module
261: elastic member 262: housing
27: Guide frame
28: bracket coupling part 281: installation hole
29: Connecting member
30: sensor module
40: Emergency tensioning module
50: Pretensioning module
60: Webbing guide
71: Torsion bar 711,712: First and second gear units
72: Reinforcing member
721: opening 722: protrusion
73: Spindle disk 731: Combined barrel section
732: Combiner
74: Spindle gear 741: Combined barrel section
742: Insertion space 743: Mating surface
75: Connecting bearing 751: Groove part
76: Bearing 761: Shaft part
762: protrusion
77: spindle axis 771: protrusion
772: Hook
100: Seat belt device
110: Belt tongue 120: Buckle

Claims (7)

A seat belt retractor including a spindle module including seat belt webbing and a spindle around which the seat belt webbing is wound,
An inner wall around which the seat belt webbing is wound is formed inside the spindle,
The spindle module includes a torsion bar installed inside the spindle and limiting the load acting on the spindle,
It includes a spindle disk and a spindle gear respectively disposed on both sides of the spindle,
The inner wall includes a first coupling space where the torsion bar is coupled,
Separating the outside of the first coupling space into a second coupling space where the seat belt webbing is wound,
The length of the torsion bar, the first coupling space, and the inner wall disposed inside the spindle are narrower than the width of the seat belt webbing so as to reduce the length of the spindle than the width of the seat belt webbing,
The second coupling space is formed at a height higher than the thickness of the seat belt webbing,
Both ends of the seat belt webbing are pressed toward the center of the spindle by the spindle disks disposed on both sides and the rear end wall of the spindle,
A seat belt retractor, wherein the seat belt webbing is wound and fixed to the outer surface of the inner wall in a curved and deformed shape by force applied from both ends. According to paragraph 1,
The seat belt webbing includes a sewing portion that is joined by a sewing method to a portion that overlaps while being wound around the inner wall,
A seat belt retractor, characterized in that one or more stepped surfaces are formed on the outer peripheral surface of the spindle at a height lower than the outer surface of the spindle to secure the sewing part. According to claim 1 or 2,
The seat belt webbing is pulled out of the spindle through a webbing withdrawal hole formed in the spindle and continuously wound around the outer surface of the spindle. According to paragraph 3,
A seat belt retractor, characterized in that a reinforcing member that reinforces the rigidity of the spindle and the inner wall is coupled to the second coupling space. delete According to paragraph 3,
A seat belt retractor, wherein both ends of the torsion bar are press-fitted into a coupling tube formed on the spindle disk and a coupling tube formed on the spindle gear, respectively, and are coupled to the inside of the spindle by press-fitting. According to paragraph 3,
The spindle disk is a seat belt retractor characterized in that it is formed with an outer diameter larger than the outer diameter of the spindle to guide the initial winding position of the seat belt webbing.

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