KR102656771B1 - Pretentioning module and seat belt retractor with the same - Google Patents

Abstract

It relates to a pre-tensioning module and a seat belt retractor to which it is applied, a drive motor that generates a rotational force to wind or unwind seat belt webbing (hereinafter referred to as 'webbing') on a spindle, and the drive motor depending on whether the webbing is wound or not. It includes a power transmission unit that selectively transmits or blocks the rotational force generated from the spindle, and the power transmission unit is arranged in parallel along the same direction as the spindle and transmits or blocks the rotational force according to the rotation direction of the drive motor. A configuration is provided including a clutch unit and a transmission gear that transmits the rotational force transmitted from the clutch unit to the spindle, and transmits the rotational force generated by the drive motor to the spindle so that the webbing can be wound or withdrawn, and the drive motor Clutch on and off functions can be provided to block the rotational force.

Description

Pre-tensioning module and seat belt retractor to which it is applied {PRETENTIONING MODULE AND SEAT BELT RETRACTOR WITH THE SAME}

The present invention relates to a seat belt retractor, and more specifically, to a pre-tensioning module that smoothly pulls out the seat belt webbing during normal driving of the vehicle and reduces slack by winding the webbing just before a collision occurs, and to a seat belt retractor to which the same is applied. It's about.

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, etc. during a sudden stop or sudden acceleration due to a vehicle accident, etc. These retractors allow the webbing to be pulled out in 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 loose. It may include emergency tensioning devices and pre-tensioning devices that reduce deflection, or slack.

For example, Patent Document 1 and Patent Document 2 below disclose a retractor technology that controls the unwinding and retracting operations of seat belt webbing.

On the other hand, when an acceleration greater than a predetermined value is applied to the seat belt retractor in the horizontal direction, such as in the event of a car collision, or the inclination of the vehicle changes, the seat belt locking device is activated to prevent the webbing from being pulled out. Vehicle sensors that detect acceleration or tilt are applied.

As an inertial body used in the above vehicle sensor, it is known to use a ball or a self-supporting inertial body.

For example, in a hazardous situation where a deceleration or tilt higher than the normal deceleration rate of the webbing is applied to the vehicle, a vehicle sensor may detect a moving inertial body and a control disk that is moved by the inertial body and rotates with the spool of the seat belt retractor. It includes a sensor lever that interacts with external teeth.

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.

In particular, when the seat belt retractor is installed on the backrest of the seat, the inclination changes as the backrest rotates.

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.

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)

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 becoming slimmer 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 pre-tensioner applied to the seat belt retractor according to the prior art is composed by assembling multiple parts to provide the function of transmitting or blocking rotational force, the structure is complicated and the overall size is unnecessarily increased. there was.

The purpose of the present invention is to solve the problems described above, and is installed on a seat belt retractor that secures and safely protects the occupants in the event of a car collision, and includes a pre-tensioning module that reduces slack by wrapping the webbing before the car crashes. It is provided.

Another object of the present invention is to provide a pre-tensioning module that can be applied to a slim seat by reducing the thickness of the backrest and a seat belt retractor to which the same is applied.

In order to achieve the above-mentioned purpose, the pre-tensioning module according to the present invention includes a drive motor that generates a rotational force to wind or unwind seat belt webbing (hereinafter referred to as 'webbing') on a spindle and whether or not the webbing is wound. and a power transmission unit that selectively transmits or blocks the rotational force generated by the drive motor to the spindle, wherein the power transmission unit is arranged in parallel along the same direction as the spindle and transmits the rotational force according to the rotation direction of the drive motor. It includes a clutch unit for transmitting or blocking and a transmission gear for transmitting the rotational force transmitted from the clutch unit to the spindle, transmitting the rotational force generated by the drive motor to the spindle so that the webbing can be wound or withdrawn, and the drive motor It is characterized by a clutch on and off function that blocks rotational force.

In addition, in order to achieve the above-mentioned object, a seat belt retractor to which a pre-tensioning module according to the present invention is applied is a spindle module including a spindle on which the webbing is wound, and a slack by winding the webbing immediately before a collision of the vehicle occurs. and a pre-tensioning module that reduces the spindle, wherein the spindle is disposed in a mounting space formed on the backrest of the seat along the front-to-rear direction of the vehicle corresponding to the thickness direction of the backrest.

As described above, according to the pre-tensioning module according to the present invention and the seat belt retractor to which it is applied, the clutch on and off functions can be implemented to transmit or block the rotational force generated by the drive motor provided in the pre-tensioning module to the spindle. The effect that there is is obtained.

That is, according to the present invention, the effect of providing a clutch function to transmit or block the rotational force generated by the drive motor to the spindle is obtained using the clutch portion disposed along the same direction as the spindle.

Therefore, according to the present invention, the effect of being applicable even if the radial size of the pre-tensioner module is small is obtained.

In addition, according to the present invention, the effect of being able to linearly reciprocate the travel gear along the axial direction of the shaft is obtained using the screw thread formed on the shaft.

1 is a perspective view of a seat belt retractor to which a pre-tensioning module is applied according to a preferred embodiment of the present invention;
Figure 2 is a diagram showing the seat belt retractor shown in Figure 1 installed on the seat of a car;
3 is a perspective view of a pretensioning module according to a preferred embodiment of the present invention;
Figure 4 is an exploded perspective view of the pre-tensioning module shown in Figure 3;
Figure 5 is a cross-sectional view taken along line A-A' shown in Figure 3;
Figure 6 is a diagram showing the operating state of the pretensioning module.

Hereinafter, a pre-tensioning module and a seat belt retractor to which it is applied according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

First, the configuration of a seat belt retractor to which a pre-tensioning module is applied according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Figure 1 is a perspective view of a seat belt retractor to which a pre-tensioning module is applied according to a preferred embodiment of the present invention, and Figure 2 is a diagram showing the seat belt retractor shown in Figure 1 installed on the seat of a car. Figure 2(a) shows a front view of the sheet, and Figure 2(b) shows a rear view of the sheet.

Hereinafter, the direction facing the steering wheel based on the vehicle 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 FIGS. 1 and 2, the seatbelt retractor 10 to which the pre-tensioning module according to a preferred embodiment of the present invention is applied, has seatbelt webbing (hereinafter abbreviated as 'webbing') 21 wound. A spindle module 20, a sensor module 30 that detects changes in the tilt of the vehicle and the pulling acceleration of the webbing 21, an emergency tensioning module 40 that reduces slack by winding the webbing 21 in the event of a vehicle collision, and the vehicle It may include a pre-tensioning module 50 that smoothly withdraws the webbing 21 during normal driving and reduces slack by winding the webbing 21 just before a collision occurs.

In this embodiment, each part applied to the seat belt retractor 10 is manufactured by modularizing each functional block and selectively combining each modularized part.

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 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 include an acceleration sensor that detects a change in acceleration of the webbing 21 or a tilt sensor that detects a change in inclination of the vehicle.

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 front-to-back width, is minimized.

An emergency tensioning module 40 and a pre-tensioning module 50 are coupled to the upper part of the spindle module 20.

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, as shown in FIGS. 1 and 2, a sensor module 30, an emergency tensioning module 40, and a pre-tensioning module 50 may be placed on top of the spindle module 20, respectively. .

Each module combined in this way is installed side by side so that the axis provided in each module faces the same direction as the direction in which the spindle 22 is installed, and is configured to transmit or receive power through a power transmission unit such as a gear. .

The emergency tensioning module 40 uses the pressure of the gas generated by operating an inflator (not shown) containing gunpowder by a detection signal that detects a vehicle collision to wind the webbing 21 around the spindle 22. give. Therefore, the emergency tensioning unit 40 can reduce the slack of the webbing 21 by winding the webbing 21 in the event of a vehicle collision, thereby reducing the number of injuries to passengers.

When a collision of a vehicle is predicted through a sensor applied to the vehicle, the pre-tensioning module 50 drives a motor capable of forward and reverse rotation to wind the webbing 21 around the spindle 22. That is, the pre-tensioning module 50 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 21 from becoming loose. In order to prevent this possibility, it is possible to reduce the slack of the webbing 21 by wrapping the webbing 21 just before the collision of the vehicle, thereby reducing the number of injuries to passengers.

Meanwhile, first and second brackets 27 and 28 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.

That is, the first bracket 27 is disposed on the front side of the spindle module 20, and the second bracket 28 is disposed on the rear side of the spindle module 20. Additionally, coupling members are provided on both sides of the first bracket 27 and the second bracket 28, and installation members installed on the backrest 12 are provided at the lower ends of the first and second brackets 27 and 28. It can be provided.

In addition, a pull-out space 251 into which the webbing 21 is pulled out may be provided on one side of the first and second brackets 27 and 28, at the bottom left as seen in FIG. 8. A guide member 29 may be installed in the pull-out space 251 along the front-back direction in the same way as the spindle 22.

The guide member 29 functions to guide the webbing 21 to be drawn upward. This guide member 29 is a roller whose front and rear ends are rotatably coupled to the first and second brackets 27 and 28, respectively, so that the webbing 21 can be smoothly wound or pulled out from the spindle 22. It can be prepared by.

Therefore, the front-to-back width of the entire seat belt retractor 10 may be limited to the front-to-back width of the first and second brackets 27 and 28.

In FIG. 2, 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 webbing guide 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.

Meanwhile, in FIG. 2, the mounting space 13 is shown at the center of the upper part of the backrest 12, but the present invention is not necessarily limited thereto, and is formed at a position spaced downward at a certain distance from the upper end of the backrest 12. Alternatively, it may be formed deviating from the center of the isopod 12 to the left or right.

On one side of this mounting space 13, a space in which the webbing 21 is disposed toward the webbing guide 14 may be in communication.

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

Here, the webbing 21 is pulled out of the backrest 12 through the mounting space 13 and the arrangement space 15 with both ends wound around the spindle 22 facing the front-back direction, and is attached to the webbing guide 14. The withdrawal direction can be changed so that both ends face approximately left and right directions.

That is, the pulling direction of the webbing 21 is changed so that both ends disposed along the front-back direction between the spindle 22 and the webbing guide 14, that is, within the arrangement space 15, face left and right.

In addition, the withdrawal angle of the webbing 21 can be adjusted depending on the position of the webbing guide 14.

For example, when the passenger on the driver's seat 11 is an adult, the webbing 21 is disposed on one side of the backrest 12, as shown in FIG. 10, toward the upper left or upward when viewed from FIG. 10. do. That is, one end of the webbing 21 is wound around the outer surface of the spindle 22, and the other end of the webbing 21 is pulled out of the seat belt retractor 10 and then moved to the webbing guide 14 installed on the backrest 12. is drawn upward toward .

Meanwhile, if the passenger on the seat 11 is a woman, teenager, or infant whose physique is smaller than that of an adult, the withdrawal angle may be adjusted so that the seat 11 is pulled out from a position moved downward from the upper left side of the backrest 12.

For example, when the passenger adjusts the angle of the backrest by rotating the backrest rearward, the webbing may get caught on the passenger's neck or shoulder area, causing discomfort.

In addition, it is necessary to adjust the withdrawal angle of the webbing 21 according to the body type of the occupant or the purpose of use, such as when an adult, teenager, or infant is riding, or when a child seat is installed.

Therefore, an adjusting member (not shown) is installed on the webbing guide 14 to be movable in a preset range from the upper surface of the backrest 12 to the upper left side, and the webbing 21 is guided according to the position of the adjusting member. The withdrawal angle is adjusted by rotating the member 29 as a rotation axis.

In this way, in the present invention, the webbing wound around the spindle can be pulled out through one side of the first and second brackets, and the pulling angle of the webbing can be freely adjusted within the mounting space of the backrest.

Accordingly, the present invention can improve safety by adjusting the withdrawal direction and angle of the webbing according to the occupant's physical condition or purpose of use.

At this time, the webbing 21 is arranged so that both ends face forward and backward when pulled out of the spindle module 20, and rotates in one direction when pulled out through the arrangement space 15 and the webbing guide 14 so that both ends It is pulled out in a state where it is arranged to face the left and right directions.

As such, the present invention can minimize the front-to-back width when mounted on the backrest of a seat by changing the arrangement direction of the spindle around which the webbing is wound.

In addition, the present invention minimizes the width of the webbing by reducing the thickness of the spindle module, thereby minimizing the width at which the spindle module and the seat belt retractor to which it is applied are mounted on the seat, so that it can be manufactured slim.

Additionally, the present invention can freely adjust the direction and angle of the webbing pulled out from the spindle module.

Meanwhile, in this embodiment, the configuration of the seat belt retractor to which the pre-tensioning module is applied has been described with reference to FIGS. 1 and 2, but the present invention is not necessarily limited thereto and can be applied to variously modified seat belt retractors. It may be changed to make it possible.

Next, the configuration of the pre-tensioning module according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

Figure 3 is a perspective view of a pre-tensioning module according to a preferred embodiment of the present invention, Figure 4 is an exploded perspective view of the pre-tensioning module shown in Figure 3, and Figure 5 is taken along line A-A' shown in Figure 3. This is a cross-sectional view.

As shown in FIGS. 1 to 5, the pre-tensioning module 50 includes a drive motor 51 that generates a rotational force to wind or unwind the webbing 21, and a drive motor (51) depending on whether the webbing 21 is wound. It includes a power transmission unit 52 that selectively transmits or blocks the rotational force generated in 51) to the spindle 22.

The drive motor 51 and the power transmission unit 52 may each be installed inside separate casings.

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 removed.

The output shaft of the drive motor 51 and the drive gear 511 installed on the output shaft may be disposed at the left end of the drive motor 51.

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.

In detail, the power transmission unit 52 is a clutch unit arranged side by side along the same direction as the spindle 22 on the upper part of the spindle 22 and transmitting or blocking the rotational force according to 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.

The clutch unit 53 is formed in a substantially cylindrical shape with the front open and includes a housing 61 that rotates by the rotational force of the drive motor 51, a head 62 disposed inside the housing 61, and the head 62. It may include a travel gear 63 that reciprocates linearly through a rotational motion, and a head 64 that engages the travel gear 63 and receives rotational force.

In addition, the power transmission unit 52 includes a first connection gear 55 that engages the drive gear 511 and transmits rotational force to the housing 61, and a head gear 641 installed at the rear end of the head 64. It may further include a second connecting gear 56 that engages.

A space in which the head 62, the travel gear 63, and the head 64 are installed is formed inside the housing 61, and a cover 65 can be coupled to the open front of the housing 61.

The cover 65 is formed in a substantially disk shape and can be coupled to the front end of the housing 61 using one or more coupling protrusions.

For this purpose, one or more coupling grooves into which one or more of the coupling protrusions are coupled may be formed at the front end of the housing 61.

A housing gear 611 having a plurality of teeth may be provided on the outer peripheral surface of the housing 61 to receive rotational force from the first connection gear 55. Therefore, the housing 61 can rotate by receiving the rotational force generated from the drive motor 51 through the first connection gear 55.

And, on the inner peripheral surface of the housing 61, a plurality of ribs 612 are provided on which a plurality of locking protrusions 633 of the travel gear 63, which will be described below, are engaged so as to transmit the rotational force of the housing 61 to the travel gear 63. may be formed to protrude.

The plurality of ribs 612 may be formed in parallel and spaced apart from each other at a predetermined distance along the longitudinal direction of the housing 61, that is, in the front-back direction.

The head 62 is formed in a substantially cylindrical shape and may be coupled to the housing 61 by penetrating the interior in the front-back direction. That is, the front end of the head 62 may be coupled to the cover 65, and the head 64 may be rotatably coupled to the rear end of the shaft 62.

A plurality of screw threads 621 are formed on the outer peripheral surface of the shaft 62 to be screwed together with the travel gear 63, and a plurality of screw threads 621 are formed on the rear side to prevent forward movement of the head 63 to prevent the head 63 from moving forward. A step 622 that fixes the position may be formed.

The travel gear 63 is formed in a substantially cylindrical shape with front and rear openings so that the shaft 62 can be coupled thereto, and the inner peripheral surface of the travel gear 63 has a plurality of threads formed on the outer peripheral surface of the shaft 62. A plurality of threads 631 corresponding to 621 may be formed. Therefore, as shown in FIG. 5, the travel gear 63 reciprocates in a straight line along the front-back direction according to the rotation direction of the shaft 62 inside the housing 61.

This travel gear 63 engages with the head 64 by linear reciprocating motion to transmit the rotational force of the housing 61 to the head 64, and is separated from the head 64 to block the rotational force transmitted to the head 64. It performs the function of

For this purpose, a first connection portion 632 and a second connection portion 642 each having a plurality of teeth formed to engage with each other may be provided at the rear end of the travel gear 63 and the front end of the head 64.

A plurality of locking protrusions 633 that engage the plurality of ribs 612 formed on the inner circumferential surface of the housing 61 may be protruding from the outer peripheral surface of the travel gear 63.

The head 64 is formed in a substantially cylindrical shape with the front open, and at the rear end of the head 64 is a transmission gear 54 that transmits the rotational force transmitted while engaged with the travel gear 63 through the second connection gear 56. ), the axis on which the headgear 641 is mounted may be formed to protrude toward the rear.

Here, an elastic member 66 that provides elastic force to the travel gear 63 and the head 64 may be installed in the internal space of the travel gear 63 and the head 64.

The elastic member 66 may be installed in a space formed inside the travel gear 63 and the head 64 by combining them. The front end of the elastic member 66 may be supported on the thread 631 of the travel gear 63, and the rear end of the elastic member 66 may be supported on the front end wall of the head 64.

This elastic member 66 can use elastic force in normal times to prevent the travel gear 63 and the head 64 from moving or moving backward and forward, respectively.

In addition, the elastic member 66 is elastically deformed so that its length becomes shorter when the travel gear 63 moves backward, and provides elastic force when the travel gear 63 moves forward by rotation of the housing 61 and the shaft 62, thereby reducing the travel. Gear 63 can be moved forward toward its initial position.

The first connection gear 55 is a first gear 551 engaged with the drive gear 511 and a housing gear 611 installed on the same axis as the first gear 551 and formed on the outer peripheral surface of the housing 61. It may include a second gear 552 engaged with.

Here, the driving gear 511 and the first gear 551 may be provided with a worm and a worm gear to transmit rotational force in a right angle direction.

The second connection gear 56 includes a first gear portion 561 having a plurality of teeth engaged with the head gear 641 on the outer peripheral surface, and a second gear portion having a plurality of teeth engaged with the transmission gear 54 formed on the outer peripheral surface. It may include (562).

The transmission gear 54 is meshed with the second gear unit 562 of the second connection gear 56 and the driven gear (not shown) installed on the spindle 22 to transmit the rotational force transmitted through the clutch unit 53. It can be transmitted to the spindle 22.

This transmission gear 54 may be composed of one gear or a plurality of gears continuously meshed with each other.

In this way, the present invention can implement a clutch function to transmit or block the rotational force generated by the drive motor provided in the pre-tensioning module to the spindle.

That is, the present invention can provide a clutch function to transmit or block the rotational force generated by the drive motor to the spindle using a clutch unit disposed along the same direction as the spindle.

Therefore, the present invention can be applied even if the radial size of the pre-tensioner module is small.

In addition, the present invention can reciprocate the travel gear in a straight line along the axial direction of the shaft by using the screw thread formed on the shaft.

Next, the coupling relationship and operating method of the pre-tensioning module according to a preferred embodiment of the present invention will be described in detail.

First, the operator couples the travel gear 63 and the head 64 of the clutch unit 53 to the front and rear sides of the shaft 62, respectively, inserts them into the housing 61, and inserts them into the open front of the housing 61. Attach the cover (65) to. At this time, an elastic member 66 is disposed between the travel gear 63 and the head 64.

In the clutch unit 53 assembled in this way, the housing gear 611 formed on the outer peripheral surface of the housing 61 and the first connection gear 55 are engaged, and the head gear 641 mounted on the rear end of the head 64 is It is mounted so as to engage with the second connection gear 56.

Next, the worker assembles the drive motor 51 and the transmission gear 54 so that they mesh with the first connection gear 55 and the second connection gear 56, respectively.

The pre-tensioning module 50 assembled through this process has a clutch-on function and a rotational force that transfers the rotational force generated by the drive motor 51 to the spindle 22 along the rotation direction of the drive motor 51. It performs a clutch off function to block transmission to the spindle 22.

For example, Figure 6 is a diagram showing the operating state of the pre-tensioning module.

5 and 6, when the drive motor 51 rotates to one side and the housing 61 of the clutch unit 53 provided in the power transmission unit 52 rotates clockwise (CW) shown in FIG. 6, The travel gear 63 screwed to the outer peripheral surface of the shaft 62 moves rearward and engages with the head 64.

With the travel gear 63 and the head 64 engaged in this way, if the housing 61 continues to rotate clockwise, the rotational force of the housing 61 and the shaft 62 is applied to the head gear of the head 64 ( The transmission gear 54 is rotated clockwise through 641) and the second connection gear 56.

Through this process, the clutch unit 53 can provide a clutch-on function that transfers the rotational force generated by the drive motor 51 to the spindle 22.

Meanwhile, when the drive motor 51 rotates to the opposite side and the housing 61 rotates counterclockwise (CCW), the travel gear 63 moves forward and is separated from the head 64.

When the travel gear 63 and the head 64 are separated in this way, even if the housing 61 continues to rotate counterclockwise, the rotational force of the housing 61 and the shaft 62 is not transmitted to the transmission gear 54. blocked.

Through this process, the clutch unit 53 can provide a clutch-off function that blocks the rotational force generated by the drive motor 51 from being transmitted to the spindle 22.

Through the process described above, the clutch on and off functions can be implemented to transmit or block the rotational force generated by the drive motor provided in the pre-tensioning module to the spindle.

That is, the present invention can provide a clutch function to transmit or block the rotational force generated by the drive motor to the spindle using a clutch unit disposed along the same direction as the spindle.

Therefore, the present invention can be applied even if the radial size of the pre-tensioner module is small.

In addition, the present invention can reciprocate the travel gear in a straight line along the axial direction of the shaft by using the screw thread formed on the shaft.

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, in the above embodiment, the seat belt retractor was described as being manufactured by selectively combining a spindle module, a sensor module, an emergency tensioning module, and a pre-tensioning module. However, the present invention has additional functions in addition to the above modules. Modules can also be manufactured by combining them more selectively.

In the above embodiment, it has been described that the spindle placement direction and the webbing pull-out direction are perpendicular to each other, but the present invention is not necessarily limited to this, and the spindle placement direction and the webbing pull-out direction may vary depending on the surrounding conditions where the spindle is installed. It may also be changed to form a direction other than a right angle, such as an acute or obtuse angle.

In addition, in the above embodiment, the configuration of the seat belt retractor to which the pre-tensioning module is applied has been described with reference to FIGS. 1 and 2, but the configuration of the seat belt retractor is not necessarily limited to this and can be changed in various ways. It may be possible.

The present invention is applied to a pre-tensioning module that implements a clutch on and off function to transmit or block the rotational force generated by the drive motor provided in the pre-tensioning module to the spindle and to the seat belt retractor technology to which the same is applied.

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: housing 24: guide part
25: Guide frame 251: Draw-out space
26: connecting member 27, 28: first and second brackets
29: Guide member
30: sensor module
40: Emergency tensioning module
50: Pretensioning module
51: drive motor 511: drive gear
52: Power transmission unit 53: Clutch unit
54: Transmission gear
55: 1st connection gear 551,552: 1st, 2nd gear
56: second connection gear 561,562: first and second gear units
61: housing 611: housing gear
612: rib
62: shaft 621: thread
622: Danteok
63: travel gear 631: thread
632: first connection portion 633: engaging protrusion
64: Head 641: Headgear
642: second connection
65: Cover 66: Elastic member

Claims (8)

A drive motor that generates rotational force to wind or unwind the seat belt webbing (hereinafter referred to as 'webbing') on the spindle, and
A power transmission unit that selectively transmits or blocks rotational force generated by the drive motor to the spindle depending on whether the webbing is wound,
The spindle is installed on the seat of the vehicle in the front-to-back direction,
The power transmission unit is arranged in parallel along the same direction as the spindle and includes a clutch unit that transmits or blocks rotational force according to the rotation direction of the drive motor;
A transmission gear that transmits the rotational force transmitted from the clutch unit to the spindle,
A first connection gear that engages with a drive gear installed on the output shaft of the drive motor and transmits rotational force to the clutch unit, and
Including a head gear installed on one end of the head provided in the clutch unit and a second connection gear that engages each of the transmission gears to transmit rotational force.
It transmits the rotational force generated by the drive motor to the spindle so that the webbing can be wound or withdrawn, and has a clutch on and off function to block the rotational force of the drive motor,
The clutch unit is formed in a cylindrical shape with one side open and rotates forward and backward by the rotational force of the drive motor,
A shaft disposed inside the housing,
A travel gear that performs linear reciprocating motion by the rotational motion of the shaft, and
It includes a head that engages with the travel gear and transmits rotational force,
The travel gear is screwed to the outside of the shaft and reciprocates linearly along the axial direction of the shaft, and is coupled to the head according to the rotation direction of the shaft to transmit rotational force or is separated from the head to block transmission of rotational force. A pre-tensioning module characterized in that. delete According to paragraph 1,
The first connecting gear includes a first gear engaged with the driving gear and
A pre-tensioning module comprising a second gear installed on the same axis as the first gear and meshing with a housing gear formed on an outer peripheral surface of the housing. According to paragraph 3,
The second connection gear includes a first gear portion formed on an outer peripheral surface with a plurality of teeth engaging with the head gear, and
A pre-tensioning module comprising a second gear portion formed on an outer peripheral surface with a plurality of teeth engaged with the transmission gear. According to paragraph 1,
A first connection part and a second connection part each having a plurality of teeth formed to engage with each other are provided at one end of the travel gear and one end of the head that are coupled to each other,
An elastic member that provides elastic force is installed between the travel gear and the head,
The elastic member fixes the travel gear and the head at an initial position spaced apart from each other, and provides an elastic force so that the travel gear returns to the initial position when the travel gear and the head are separated. . According to paragraph 1,
A plurality of ribs are formed on the inner peripheral surface of the housing,
A pre-tensioning module, characterized in that a plurality of locking protrusions that engage the plurality of ribs are formed on the outer peripheral surface of the travel gear. In the seat belt retractor to which the pre-tensioning module according to any one of claims 1 and 3 to 6 is applied,
A spindle module including a spindle around which the webbing is wound, and
It includes a pre-tensioning module that reduces slack by winding the webbing just before a vehicle collision occurs,
A seat belt retractor with a pre-tensioning module, wherein the spindle is arranged in a mounting space formed on the backrest of the seat along the front-to-rear direction of the vehicle corresponding to the thickness direction of the backrest. In clause 7,
A sensor module that detects changes in vehicle inclination and webbing acceleration
An emergency tensioning module that reduces slack by winding the webbing in the event of a vehicle collision,
The spindle module and pre-tensioning module are manufactured by modularizing each functional block,
A seat belt retractor with a pretensioning module, wherein each module is selectively combined with the spindle module.

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