KR102617421B1 - Seat belt retractor - Google Patents

Abstract

It relates to a seat belt retractor mounted on a vehicle seat, comprising a spindle module including seat belt webbing and a spindle on which the webbing is wound around the outer surface, a sensor module that detects the inclination of the vehicle, and slack by winding the webbing in the event of a vehicle collision. An emergency tensioning module that reduces slack and a pre-tensioning module that reduces slack by winding the webbing just before a vehicle collision are manufactured by modularizing each functional block, and each module is arranged based on the spindle module, and each module To enable power transmission between them, a configuration is provided that is mechanically connected through a power transmission module to secure and safely protect the occupants in the event of a car collision. Each module that constitutes the seat belt retractor is modularized, and each module is modularized. The output of the spindle module can be adjusted by setting the rotation ratio differently depending on the function of the module.

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 belts from being pulled out in the event of a car collision.

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

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

The retractor prevents an occupant wearing a seat belt from being thrown forward or leaving the seat due to driving inertia during a sudden stop or sudden acceleration due to a vehicle accident, etc. These retractors allow 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, it is a device that suppresses further webbing withdrawal and causes the webbing to become loose or It may include emergency tensioning devices and pre-tensioning devices that reduce deflection, or slack.

Such a seat belt retractor may be mounted on a vehicle body, for example, 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, but may be mounted tilted at a certain angle from the horizontal state in the left-right direction or in the front-back direction.

In particular, when the seat belt retractor is installed on the backrest of the seat, the inclination changes according to the rotation of the backrest.

However, if the posture of the seat belt retractor according to the prior art changes beyond a certain range, acceleration and tilt cannot be properly detected.

For example, when a retractor with a vehicle sensor has a posture that is inclined more than a certain range from the horizontal state, the distance between the control disk and the sensor lever provided on the vehicle sensor becomes too close and the sensor lever operates sensitively, resulting in proper locking. The action cannot be performed.

Additionally, when the retractor with the vehicle sensor is mounted on the back of the seat, and the back of the seat is tilted toward the front of the vehicle, the sensor lever of the vehicle sensor is caught on the outer tooth of the control disk and restrains the rotation of the spool.

Because of this, if the passenger wants to wear a seat belt, it may be impossible to wear the seat belt because the rotation of the spool is restricted.

In order to solve this problem, the present applicant has disclosed a seat belt retractor configuration with a vehicle sensor with an improved fixation structure of the vehicle sensor in Patent Document 3 below, and has applied for and registered a patent.

Meanwhile, with the recent development of self-driving cars, technology is being developed to minimize the volume of seats and seat belt retractors applied to vehicles. In particular, the seat is being slimmed down by designing the backrest to be thinner.

In the seat belt retractor according to the prior art, the rotation axis of the spindle around which the webbing is wound is arranged in the same direction as the rotation axis of the backrest, so the overall volume increases depending on the amount of webbing wound around the spindle, and the seat belt retractor corresponding to the backrest There was a limit to reducing the width in the anteroposterior direction.

In addition, as the seat belt retractor according to the prior art is constructed by assembling a number of parts, the structure is complex, and even if a failure or damage occurs in any individual part, only that part cannot be repaired, so the entire retractor There was a problem that had to be replaced.

U.S. Patent No. 6,499,554 (registered on December 31, 2002) U.S. Patent No. 6,443,382 (registered on September 3, 2002) Republic of Korea Patent Registration No. 10-1766844 (announced on August 9, 2017)

The purpose of the present invention is to solve the problems described above and to provide a seat belt retractor that secures and safely protects occupants in the event of a car collision.

Another object of the present invention is to provide a seat belt retractor that can be applied to a slim seat by reducing the thickness of the backrest.

Another object of the present invention is to adjust the output of the spindle module linked to the emergency tensioning module by setting the rotation ratio differently according to the function of each module, and to prevent the stability of related parts subject to gas pressure from being weakened. The goal is to provide a seat belt retractor that can be used.

In order to achieve the above-mentioned object, the seat belt retractor according to the present invention is mounted on the seat of a vehicle, a spindle module including seat belt webbing and a spindle on which the webbing is wound on the outer surface, and a device for detecting the inclination of the vehicle. Each module is manufactured by modularizing a sensor module, an emergency tensioning module that reduces slack by winding the webbing in the event of a vehicle collision, and a pre-tensioning module that reduces slack by winding the webbing just before a vehicle collision occurs, each module They are arranged based on the spindle module and are mechanically connected through a power transmission module to enable power transmission between each module.

As described above, according to the present invention, the effect of minimizing the front-to-back width of the seat mounted on the backrest of the seat and slimming the seat by rotating the direction in which the spindle around which the webbing is wound is installed is achieved.

That is, according to the present invention, by changing the arrangement direction of the spindle around which the webbing is wound, the effect of designing the backrest to be thin and minimizing the mounting space required when applying it to a slimmed down seat is obtained.

And according to the present invention, the effect of being able to modularize each part applied to the seat belt retractor by functional block and manufacture it by selectively combining modules corresponding to necessary functions is obtained.

Accordingly, according to the present invention, it can be applied to recently developed slim seats, and an integrated seat belt integrated into the seat can be implemented.

In addition, according to the present invention, the effect of being able to adjust the output of the spindle module linked to each module is obtained by setting the rotation ratio differently according to the function of each module.

That is, according to the present invention, the output value, that is, the rotational force of the spindle, can be increased while maintaining the input value of the emergency tensioning module without changing the capacity of the gas generator provided in the emergency tensioning module.

For this reason, according to the present invention, it is possible to control the output of the spindle module linked to the emergency tensioning module, and the effect of effectively preventing the stability of related parts acting on gas pressure from being weakened is obtained.

1 is an example of a seat belt retractor according to the prior art;
Figure 2 is a perspective view of a seat belt retractor according to a preferred embodiment of the present invention;
Figure 3 is a view showing the seat belt retractor shown in Figure 2 installed on the seat of a vehicle;
Figure 4 is a schematic configuration diagram showing the connection relationship of each seat belt retractor shown in Figure 2;
Figures 5 and 6 are respectively perspective views of the seat belt retractor shown in Figure 2 from different angles;
Figure 7 is a plan view of the seat belt retractor in Figure 5;

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.

First, before explaining the configuration of a seat belt retractor according to a preferred embodiment of the present invention, the configuration of a seat belt retractor according to the prior art will be briefly described with reference to FIG. 1.

1 is an exemplary diagram of a seat belt retractor according to the prior art.

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.

As shown in Figure 1, the seat belt retractor (1) according to the prior art includes a spindle (3) around which seat belt webbing (hereinafter abbreviated as 'webbing') (2) is wound, and a sensor that detects the inclination of the vehicle. Unit (4), an emergency tensioning unit (5) that reduces slack by winding the webbing (2) in the event of a vehicle collision, and an emergency tensioning unit (5) that smoothly withdraws the webbing (2) when the vehicle is running normally and winds the webbing (2) just before a collision occurs to reduce slack. It may include a pre-tensioning unit (6) that reduces.

The sensor unit 4 detects a change in the acceleration of the webbing being pulled out or a change in the inclination of the vehicle due to a vehicle collision.

The emergency tensioning unit (5) operates an inflator (not shown) containing gunpowder in response to a detection signal that detects a vehicle collision, and uses the pressure of the gas generated to wind the webbing (2) around the spindle (3). give. Therefore, the emergency tensioning unit 5 can reduce the slack of the webbing 2 by winding the webbing 2 in the event of a vehicle collision, thereby reducing the number of injuries to passengers.

When a vehicle collision is predicted through a sensor applied to the vehicle, the pre-tensioning unit 6 drives a motor capable of forward and reverse rotation to wind the webbing 2 around the spindle 3. That is, the pre-tensioning unit (6) keeps the worn webbing (2) taut until a stronger acceleration or deceleration of the vehicle occurs, even without an accident, under normal driving conditions and prevents the webbing (2) from loosening. In order to prevent this possibility, it is possible to reduce the slack of the webbing (2) by wrapping the webbing (2) just before the collision of the vehicle, thereby reducing the amount of injury to the passenger.

Here, the spindle (3) is installed inside the fixed frame (7), and the sensor unit (4), emergency tensioning unit (5), and pre-tensioning unit (6) are placed on both sides of the fixed frame (7). , the left and right housings (8, 9) are combined on the outside of each unit.

That is, each unit 4, 5, and 6 is arranged along the transverse direction on both sides of the spindle 2.

In this way, the seat belt retractor (1) according to the prior art combines each component, such as the spindle (3), sensor unit (4), emergency tensioning unit (5), and pre-tensioning unit (6), with each other in a complex structure. It is manufactured by

For this reason, in the seat belt retractor (1) according to the prior art, the spindle (3) is installed between both walls of the fixed frame, and one side of the webbing (2) is wound around the outer surface of the spindle (3) and the other side is It is withdrawn upward.

And in the seat belt retractor (1) according to the prior art, the spindle (3) is installed between the two walls of the fixed frame, and one side of the webbing (2) is wound around the outer surface of the spindle (3) and the other side is directed upward. is withdrawn.

Therefore, in the seat belt retractor 1 according to the prior art, as the length of the webbing 2 wound around the spindle 3 increases, the volume in the front-to-back direction inevitably increases gradually.

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

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°.

In this way, in order to install the seat belt retractor 1 on a slimmed seat, it is necessary to minimize the front-to-back width of the seat belt retractor 1 mounted on the seat, especially the backrest.

However, in the seat belt retractor 1 according to the prior art, as described above, the spindle 3 is installed between both sides of the fixed frame 7, and the spindle 3 faces the same direction as the rotation axis of the backrest. It is equipped to do so.

Accordingly, the seat belt retractor 1 according to the prior art had a problem in that it was difficult to apply to the backrest of a slimmed seat as the front-to-back width increased with the length of the webbing 2 wrapped around the outer surface.

In order to solve this problem, the present invention modularizes each component applied to the seat belt retractor by functional block and manufactures it by selectively combining modules corresponding to necessary functions.

In addition, the present invention changes the direction in which the spindle around which the webbing is wound is installed to minimize the front-to-back width of the seat belt retractor, making it slimmer.

In particular, the present invention connects each module in parallel based on a spindle module in which the spindle around which the webbing is wound is provided, and adjusts the output by applying a different rotation (speed) ratio for each function of each module.

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 to 7.

Figure 2 is a perspective view of a seat belt retractor according to a preferred embodiment of the present invention, Figure 3 is a diagram showing the seat belt retractor shown in Figure 2 installed on the seat of a vehicle, and Figure 4 is shown in Figure 2. It is a schematic diagram showing the connection relationship of each seat belt retractor, and Figures 5 and 6 are perspective views showing the seat belt retractor shown in Figure 2 from different angles, respectively, and Figure 7 is a seat belt retractor shown in Figure 5. This is a top view of the tractor.

5 to 7 show a state in which covers, housings, brackets, etc. applied to each module have been removed so that the connection relationship between each module can be confirmed.

As shown in FIGS. 2 and 3, the seat belt retractor 10 according to a preferred embodiment of the present invention is installed on the backrest 12 of each seat 11 provided in a vehicle to adjust to the driving state or conditions of the vehicle. Accordingly, the seat belt webbing (hereinafter referred to as 'webbing') 21 is released or wrapped to restrain the occupant and protect him/her safely.

That is, the present invention is a seat-integrated seat belt retractor that constitutes the BIS installed on the backrest 12 of the seat 11, and can be installed in the mounting space 13 formed on the backrest 12.

As shown in FIG. 3, the mounting space 13 may be formed to extend long along the left and right directions of the vehicle at approximately the center of the rear upper part of the backrest 12.

Of course, the present invention is not necessarily limited to this, and the mounting space 13 may be formed to be biased to the left or right of the upper part of the backrest 12, or may be changed to be formed in the center or lower part of the backrest 12.

And the seat belt retractor 10 according to a preferred embodiment of the present invention includes the spindle 3, sensor unit 4, emergency tensioning unit 5, and pre-tensioning unit 6 described with reference to FIG. 1. It can be assembled by selectively combining the spindle module 20, sensor module 30, emergency tensioning module 40, pre-tensioning module 50, and additional function modules that are modularized to correspond to each device. .

That is, 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, the seat belt retractor 10 can be assembled by selectively combining the spindle module 20, the sensor module 30, the emergency tensioning module 40, the pre-tensioning module 50, and the additional function module. You can.

The additional function module mechanically connects each module to a load control module 60 that adjusts the load acting on the webbing 21 according to the conditions of the occupant's condition, including the occupant's physique and weight information, and when each module is driven. It may further include one or more power transmission modules 70 that transmit the generated force to the spindle module 20.

For example, the load control module 60 is configured to provide a first limiter 61 that provides a relatively large high level load to the spindle 22 when the passenger seated in the seat is a relatively heavy adult male. ) and, when the passenger seated in the seat is a woman or child of relatively light weight, a second limiter 62 and a first limiter ( 61) and a switching unit 63 that switches to adjust the load for releasing the webbing 21 by selectively using the torsion of the second limiter 62.

The first limiter 61 may be installed inside the spindle 22 of the spindle module 20, and the second limiter 62 may be placed parallel to the first limiter 61 on the outside of the spindle 22. Therefore, the second limiter 62 can be connected to or separated from the spindle 22 through the switching unit 63 and the power transmission module 70.

The switching unit 63 rotates the spindle 22 by the tensioning unit 43 provided in the emergency tensioning module 40 to wind the webbing 21, and then uses the first limiter 61 and the second limiter ( The torsion of 62) can be selectively used to control the load that releases the webbing 21. Accordingly, the switching unit 63 can adjust the load applied to the passenger's shoulder by the webbing 21 and the amount of movement of the webbing 21.

For example, the switching unit 63 is engaged with the spindle gear 24 connected to the first limiter 61 and the spindle 22, and the central portion is a first gear coupled to one end of the second limiter 62, tensioning A second gear that engages with the tension gear connected to the wheel of the unit 43 and has one end of the second limiter 62 penetratingly coupled to the center, a drive unit that generates driving force using the gas generated from the gas generator 64, and the drive unit. It may include a switching unit that receives the driving force generated from and switches to connect or block the second limiter 62 accommodated therein and the first gear.

The power transmission module 70 is connected to the front of the seat belt retractor 10 to transmit the force generated from each module, such as the emergency tensioning module 40 and the pre-tensioning module 50, to the spindle module 20. It is provided at the rear and functions to connect each module.

Therefore, the front-to-back width of the seat belt retractor 10 may be limited to the width of the entire module including the power transmission module 70 connecting each module to each other and the housing or bracket on which each module is installed.

For example, the power transmission module 70 may include a plurality of gears connected to the drive shaft of each device, a plurality of rotation shafts on which each gear is installed, and a housing that shields the outer surfaces of each gear and the rotation shaft.

Next, the detailed configuration of each module and the connection relationship between each module using the power transmission module 70 will be described in detail.

The spindle module 20 and the sensor module 30 are basic modules that make up the seat belt retractor 10. As shown in FIG. 2, they can be manufactured and assembled as individual modules, or integrated into one module. It may be possible.

The sensor module 30 may be provided as a vehicle sensor device including an acceleration sensor that detects a change in acceleration of the vehicle and a tilt sensor that detects a change in inclination of the vehicle.

In this embodiment, it is explained that both the tilt and acceleration changes of the vehicle are detected using the sensor module 30.

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 pull-out acceleration of the webbing 21 or a change in the inclination of the vehicle occurs due to a vehicle collision.

This spindle module 20 may further provide a function of only retracting webbing in a certain section to secure a child seat.

Hereinafter, the direction in which the webbing 21 is drawn out is set to upward (U), and the direction in which the spindle 22 is mounted is set to the forward and backward directions (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 width in the front and rear directions of the vehicle, is minimized.

For example, each module is manufactured to the same thickness of approximately 40 mm to 90 mm, or based on the thickness of the spindle module 20, the remaining modules are the same as the thickness of the spindle module 20, or the spindle module 20 It can be manufactured to a thickness smaller than the thickness of .

In particular, the total thickness of the seat belt retractor 10 may be 1.5 times or less than the width of the webbing 21. For example, if the webbing 21 has a width of approximately 50 mm, the seat belt retractor 10 may be manufactured with a thickness of approximately 75 mm or less.

In addition, each module may be selectively placed on the side of the spindle module 20, that is, on the right or left, or on the top or bottom of the spindle module 20, with the spindle module 20 as the center. Therefore, each module can be mechanically connected by the power transmission module 70, which connects each module and transmits power.

For example, the spindle module 20 is disposed on one side or in the center of the seat belt retractor 10, and an emergency tensioning module 40, a sensor module 30, and a free Tensioning module 50 may be disposed.

Of course, the present invention is not necessarily limited to this.

For example, 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 at the bottom of .

In this embodiment, the remaining modules except the spindle module 20, that is, the sensor module 30, the emergency tensioning module 40, the pre-tensioning module 50, and the additional function modules 60 and 70 are shown in Figure 5. And as shown in FIG. 6, it is disposed on one side of the spindle 22, on the right side as seen in FIG. 2, with respect to the spindle module 20 with the spindle 22 as the axis.

And the remaining modules are connected to each other through the power transmission module 70 installed on the front and rear sides and transmit power to the spindle 22.

To this end, the drive axes of the remaining modules may be arranged parallel to or perpendicular to the arrangement direction of the spindle 22.

As such, the present invention can be assembled by excluding some of the above modules, for example, the pre-tensioning module 50, or by further combining additional functional modules, depending on the needs of the vehicle specifications, specifications of the seat belt retractor 10, etc. You can.

And in this embodiment, the remaining modules except the spindle module 20 are spindles so as to keep the front-to-back width of the seat belt retractor 10 mounted on the backrest 12 of the seat 11 (see FIG. 3) constant. It is manufactured to the same thickness as the module 20 or to a thickness smaller than the thickness of the spindle module 20.

In addition, in the present invention, as the remaining modules excluding the spindle module are arranged based on the spindle, the amount of winding (or loading amount) and thickness of the seat belt webbing wound around the spindle are determined by the width in the front and rear direction where the spindle is installed in the seat belt retractor. It can be configured so as not to affect .

Therefore, the seat belt retractor 10 is manufactured by manufacturing each module to a minimum thickness and arranging the remaining modules based on the spindle 22 based on the spindle module 20. It can be manufactured slim by minimizing the front-to-back width.

Accordingly, the present invention can be installed in a narrow space by minimizing the overall volume of the seat belt retractor.

And each combined module is arranged parallel to or perpendicular to the direction in which the spindle 22 is installed so that all axes provided in each module face the same direction, for example, the front-to-back direction. Therefore, each module can be configured to continuously transmit or receive power using power transmission members such as gears, chains, and belts provided in the power transmission module 70 described above.

That is, the power transmission module 70 includes a spindle gear 24 connected to the spindle 22, a locking gear 44 provided in the emergency tensioning module 40, and a power transmission unit 52 of the pre-tensioning module 50. ) may include a transmission gear 54 connected to the transmission gear 54 and one or more connection gears connecting each gear, for example, first to fourth connection gears 71 to 74 to be described below.

Here, the spindle module 20 may further include a spindle disk 23 and a spindle gear 24 disposed on both sides of the spindle 22, that is, the front end and the rear end, respectively, along with the webbing 21 and the spindle 22. You can.

As shown in FIGS. 5 and 6, the spindle 22 is formed in a substantially cylindrical shape with an open front surface, and the inside of the spindle 22 includes one end of the webbing 21, a first limiter 61, and a spindle ( 22) A reinforcing member (not shown) that reinforces the rigidity may be combined. Additionally, a spindle disk 23 may be coupled to the open front of the spindle 22, and a spindle gear 24 may be disposed on the rear of the spindle 22. Here, an elastic unit 25 that provides elastic force to the spindle 22 may be coupled to the rear of the spindle 22 so that the webbing 21 can be wound.

The sensor module 30 includes a sensor body 31 that forms the outer shape, a sensor housing 32 rotatably installed along the front and rear direction of the vehicle due to changes in the installation angle of the sensor body 31 and the inclination of the mounting object, and a vehicle. A moving member that flows inside the sensor housing 32 according to changes in inclination and acceleration, a sensor lever 33 rotatably coupled to the sensor housing 32 so as to rotate about one end according to the flow of the moving member, and It may include a pilot lever 34 coupled to one side of the sensor housing 32 so as to be rotatable by rotation of the sensor lever 33.

With one end of the sensor lever 33 axially coupled to the sensor housing 32, the sensor lever 33 may rotate in the vertical direction around the axially coupled end according to the flow of the moving member.

The pilot lever 34 may rotate in the vertical direction about one end axially coupled to the sensor body by the rotational motion of the sensor lever 33 while installed at the lower part of the sensor body 31. Therefore, when the locking protrusion formed at the top of one side of the pilot lever 34 is caught with any one of the plurality of protrusions formed on the outer peripheral surface of the steering disk 35, the spindle module 20 performs a locking operation to prevent the webbing 21 from being pulled out. .

On the other hand, when the pilot lever 34 rotates in the opposite direction so that the locking protrusion is separated from the plurality of protrusions, the coupling between the pilot lever 34 and the steering disk 35 is released, and the webbing 21 is freely pulled out. It can be.

The emergency tensioning module 40 includes a tread head 41 arranged in parallel with the spindle 22 on different axes, and prevents the spindle 22 from rotating by the operation of the sensor module 30 when a car crashes. A locking unit 42 that locks the rotational movement of the tread head 41 and tensioning that rotates the tread head 41 to reduce slack by winding the webbing 21 based on a control signal from the control unit 100 after a collision occurs. Includes unit 43.

Here, the second limiter 61 is disposed on the central axis of the tread head 41, and the locking gear 44 may be connected to the rear end of the tread head 41 through a connecting member.

The locking unit 42 may include a latch that performs a locking operation to prevent the tread head 41 from rotating in the event of a car collision, and an elastic member that provides elastic force to the latch.

The tensioning unit 43 is a gas generator that generates gas by igniting gunpowder based on a control signal from the control unit 100 when a car crash occurs, a piston that receives the gas generated by the gas generator and moves in a straight line, and a piston that moves in a straight line by the piston. It may include a rod that moves and rotates the tread head 41.

Here, the gas generator is installed inside one side of the tube 45, and the piston and rod can each be movably placed in the space inside the tube 45.

The pre-tensioning module 50 selectively uses the rotational force generated from the drive motor 51 depending on whether the driving motor 51 and the webbing 21 are wound to generate a rotational force to wind or unwind the webbing 21 and the spindle 22. ) includes a power transmission unit 52 that functions as a clutch by transmitting or blocking the power.

The drive motor 51 can rotate in the forward or reverse direction according to a control signal from a control unit (not shown) provided in the vehicle.

For example, the control unit generates a control signal to rotate the drive motor 51 in one direction to smoothly pull out the webbing 21 when the vehicle is running normally, and drives the webbing 21 to be wound just before a collision occurs. A control signal can be generated to rotate the motor 51 in the opposite direction.

The drive motor 51 may be arranged perpendicular to the spindle 22 in a direction perpendicular to the direction in which the spindle 22 is disposed on the top of the spindle 22, that is, along the left and right directions.

As such, the present invention arranges the drive motor along the left and right directions so as to be perpendicular to the spindle, so that even if the diameter or length of the drive motor increases to increase the capacity of the drive motor, the effect on the front-to-back width of the seat belt retractor can be blocked.

The power transmission unit 52 transmits the rotational force generated by the drive motor 51 to the spindle 22 so that the webbing 21 can be wound or withdrawn, and when the pre-tensioning module 50 is not in operation, the webbing 21 is It functions as a clutch on and off to block the rotational force of the drive motor 51 so that it can be pulled out smoothly.

For this purpose, the power transmission unit 52 is arranged side by side along the same direction as the spindle 22 on one side of the spindle 22, and a clutch unit that transmits or blocks rotational force depending on the rotation direction of the drive motor 51. 53) and a transmission gear 54 that transmits the rotational force transmitted from the clutch unit 53 to the spindle 22.

For example, the power transmission unit 52 includes a worm wheel engaged with a worm installed on the output shaft of the drive motor 51, a drive gear installed on the same axis as the worm wheel, and a drive gear engaged with the drive motor 51. It may include a clutch unit 53 that transmits or blocks rotational force to the transmission gear 54.

The clutch unit 53 is formed in a substantially cylindrical shape and includes a housing that rotates by the rotational force of the drive motor 51, a shaft disposed inside the housing, a travel gear that linearly reciprocates by the rotation of the shaft, and the travel gear. It may include a head that engages with and receives rotational force.

Here, a housing gear with a plurality of teeth is provided on the outer peripheral surface of the housing to receive rotational force from the driving gear, and a head gear that engages the transmission gear may be installed at the front end of the head.

That is, as shown in FIG. 7, the pre-tensioning module 50 transmits rotational force to the emergency tensioning module 40 through the drive motor 51, the clutch unit 53, and the transmission gear 54.

Then, the emergency tensioning module 40 is installed on the front end coaxially with the first connection gear 71 and the steering disk 45 engaged with a gear coaxially installed on the transmission gear 54, and the first connection gear 71 Rotational force is transmitted through the second connection gear 72 engaged with.

Therefore, the emergency tensioning module 40 includes a locking gear 44 coupled to the rear of the tread head 41 and engaged with the second connecting gear 72, and a third connecting gear coupled to the rear of the switching unit 63 ( 73) and the fourth connecting gear 74 connecting the third connecting gear 73 and the spindle gear 24 to transmit rotational force to the spindle 22.

Here, the rotational force generated by the drive motor 51 may be reduced to a preset gear ratio in the process of being transmitted to the power transmission unit 52, the transmission gear 54, and the first connection gear 71 through the gear.

For example, the rotation (speed) ratio of the drive motor 51 and the spindle gear 24 may be set to about 40 to 60:1.

That is, as the drive motor 51 rotates at a relatively high speed compared to the spindle 22, the spindle 22 passes through each of the gears described above and is reduced to a preset speed to optimize the rotation motion of the spindle. can be rotated.

And the rotation ratio of the steering disk 35 and the spindle gear 24 of the sensor module 30 may be set to about 1:1.

That is, the spindle 22 may operate at the same speed or a similar speed as the rotation speed of the steering disk 35 in the sensor module 30.

Additionally, the rotation ratio of the locking gear 44 and the spindle gear 24 of the emergency tensioning module 40 may be set to about 1:0.6 to 0.8.

Generally, in order to increase the output value of the emergency tensioning module 40, the capacity of the gas generator provided in the emergency tensioning module 40, which is an input value, is increased. In this way, when the input value is increased by increasing the capacity of the gas generator, as the gas pressure increases, related parts such as the tube to which the gas pressure acts may be damaged.

Therefore, in this embodiment, in order to prevent the stability of the components applied to the emergency tensioning module 40 from being weakened, the rotation ratio is set so that the rotation speed of the spindle module 20 is slower than that of the emergency tensioning module 40. do.

Accordingly, the present invention can increase the output value, that is, the rotational force of the spindle, while maintaining the input value of the emergency tensioning module without changing the capacity of the gas generator.

Due to this, the present invention can control the output of the spindle module linked to the emergency tensioning module, and can effectively prevent the stability of related parts subject to gas pressure from being weakened.

Of course, the present invention is not necessarily limited to this, and the rotation ratio of each module can be changed and set depending on the vehicle specifications or the installation conditions of the seat belt retractor.

For example, the rotation ratio of the locking gear 44 and the spindle gear 24 of the emergency tensioning module 40 may be set to about 1:1.1 to 2.

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.

The present invention secures and safely protects the occupants in the event of a car collision, modularizes each module that constitutes the seat belt retractor, and sets the rotation ratio differently depending on the function of each module to provide a spindle module linked to the emergency tensioning module. Applies to seat belt retractor technology with adjustable output.

1: Seat belt retractor
2: Webbing 3: Spindle
4: Sensor unit 5: Emergency tensioning unit
6: Pre-tensioning unit 7: Fixed frame
8,9: Left, right housing
10: Seat belt retractor
11: Seat 12: Backrest
13: Mounting space 14: Webbing guide
15: Layout space
20: Spindle module
21: webbing 22: spindle
23: spindle disk 24: spindle gear
25: Elastic unit
30: sensor module
31: sensor body 32: sensor housing
33: sensor lever 34: pilot lever
35: steering disc
40: Emergency tensioning module
41: Tread head 42: Locking unit
43: Tensioning unit 44: Locking gear
45: tube
50: Pretensioning module
51: Drive motor 52: Power transmission unit
53: Clutch unit 54: Transmission gear
60: load regulation module
61: first limiter 62: second limiter
63: switching unit 64: gas generator
70: Power transmission module
71 to 74: first to fourth connecting gears
100: control unit

Claims (8)

In the seat belt retractor mounted on the seat of a vehicle,
A spindle module including seat belt webbing and a spindle around which the webbing is wound,
A sensor module that detects the tilt of the vehicle,
An emergency tensioning module that reduces slack by winding the webbing in the event of a vehicle collision,
A pre-tensioning module that reduces slack by winding the webbing just before a vehicle collision occurs, and
A load control module that adjusts the load acting on the webbing according to the conditions of the occupant's condition including the occupant's physique and weight information is manufactured by modularizing each functional block,
Each module is arranged based on the spindle module and is mechanically connected through a power transmission module to enable power transmission between each module,
The spindle is disposed along the front-to-back direction of the vehicle,
Each module is arranged so that its axis is parallel or perpendicular to the spindle, and rotates at different rotation ratios,
The power transmission module includes a transmission gear that transmits the rotational force of the pre-tensioning module to the emergency tensioning module,
First and second connection gears that transmit the rotational force transmitted from the transmission gear to the steering disk provided in the sensor module,
A locking gear connected to the emergency tensioning module and engaged with the second connecting gear,
A third connection gear connected to the switching unit provided in the load control module and engaged with the locking gear, and
A seat belt retractor comprising a fourth connection gear connecting the third connection gear and a spindle gear formed on the spindle. delete According to paragraph 1,
The load control module includes a first limiter that provides a relatively high load to the spindle according to the occupant condition,
a second limiter that provides a relatively small low load to the spindle, and
It includes a switching unit that selectively uses torsion of the first limiter and the second limiter to control the load that releases the webbing,
The first limiter is disposed inside the spindle,
The second limiter is a seat belt retractor, characterized in that arranged in parallel with the spindle inside the emergency tensioning module. delete According to paragraph 3,
The seat belt retractor, characterized in that the spindle rotates at a slower speed than the rotation speed of the locking gear provided in the emergency tensioning module so that the rotation force of the spindle due to the output of the emergency tensioning module increases. According to paragraph 3,
A seat belt retractor, characterized in that the rotation ratio of the sensor module and the spindle is set so that the spindle rotates at the same speed as the rotation speed of the steering disk connected to the sensor module. According to paragraph 3,
The pre-tensioning module includes a drive motor that generates rotational force and
It includes a power transmission unit that functions as a clutch to selectively transmit or block the rotational force generated by the drive motor to the spindle depending on whether the webbing is wound,
The power transmission module is a seat belt retractor characterized in that the rotation speed of the drive motor is reduced to a preset speed and transmitted to the spindle. According to any one of claims 1, 3, and 5 to 7,
A seat belt retractor, characterized in that the front-to-back width of the seat belt retractor is set to 1.5 times or less than the front-to-back width of the webbing.

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