KR20230080930A - 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 rotational force to wind or unwind seat belt webbing (hereinafter referred to as 'webbing') on a spindle, and the drive motor depending on whether or not the webbing is wound. And a power transmission unit for selectively transmitting or blocking the rotational force generated in the spindle, wherein the power transmission unit is arranged side by side along the same direction as the spindle and transmits or blocks the rotational force according to the rotational direction of the drive motor By providing a configuration including a clutch unit and a transmission gear for transmitting rotational force transmitted from the clutch unit to the spindle, the rotational force generated by the driving motor is transmitted to the spindle so that the webbing can be wound or drawn out, and the driving motor It is possible to provide a clutch on/off function that blocks 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 particularly, to a pre-tensioning module that smoothly withdraws a seat belt webbing during normal driving of a vehicle and reduces slack by winding the webbing immediately before a collision occurs, and to a seat belt retractor to which the same is applied. it's about

In general, a seat belt safety device is provided in a seat to ensure the safety of an occupant in a vehicle.

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

The retractor prevents an occupant wearing a seat belt from being thrown forward or separated from the seat due to driving inertia when the vehicle suddenly stops or accelerates due to an accident or the like. Such a retractor allows the webbing to be drawn out in a normal state when the seat belt is worn, but when a webbing pulling out acceleration or a change in the inclination of the vehicle is detected due to a vehicle collision, a device that suppresses further pulling out of the webbing, and the loosening or loosening of the webbing It may include an emergency tensioning device and a pre-tensioning device that reduce sagging, that is, slack.

For example, Patent Literature 1 and Patent Literature 2 below disclose a retractor technology for controlling unwinding and retracting operations of seat belt webbing.

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

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

For example, a vehicle sensor may be used to detect an inertial body that moves in critical situations where a higher than normal deceleration rate or tilt of the webbing is applied to the vehicle, 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 the outer teeth.

Such a seat belt retractor may be mounted on a vehicle body, for example, a center pillar of a vehicle, a backrest of a seat, a rear pillar, or the like. Accordingly, the mounting posture of the seat belt retractor may be variously changed according to structures such as the center pillar, the backrest of the seat, and the rear pillar. That is, the seat belt retractor is not always mounted in a horizontal state, and may be mounted in an inclined state at a certain angle in the left-right direction or the front-back direction from the horizontal state.

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

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

For example, when a retractor having a vehicle sensor has an attitude tilted over a certain range from a horizontal state, the distance between the control disk and the sensor lever provided on the vehicle sensor is too close, and the sensor lever operates sensitively, so proper locking is performed. The action cannot be performed.

Further, when a retractor having a vehicle sensor is mounted on the backrest of the seat and the seat backrest is tilted toward the front of the vehicle, the sensor lever of the vehicle sensor is caught on the outer teeth of the control disk and restricts the rotation of the spool.

Due to this, when an occupant wants to wear a seat belt, rotation of the spool is restricted, making it impossible to wear the seat belt.

In order to solve this problem, the present applicant discloses a seat belt retractor configuration having a vehicle sensor in which the fixing structure of the vehicle sensor is improved in Patent Document 3 below, and has applied for and registered a patent.

US Patent No. 6,499,554 (registered on December 31, 2002) US 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, technologies for minimizing the volume of seats and seat belt retractors applied to vehicles have been developed. In particular, the seat has been slimmed down by designing the thickness of the backrest thin.

In the seat belt retractor according to the prior art, as the rotational axis of the spindle on which the webbing is wound is disposed in the same direction as the rotational axis of the backrest, the overall volume increases according to the amount of webbing wound on the spindle, and the seat belt retractor corresponding to the backrest There was a limit to reducing the front-to-back direction width of .

In addition, as the pre-tensioner applied to the seat belt retractor according to the prior art is configured by assembling a number of parts to provide a function of transmitting or blocking rotational force, the structure is complicated and the overall size is unnecessarily increased. there was.

An object of the present invention is to solve the above problems, a pre-tensioning module installed in a seat belt retractor that secures and safely protects occupants in the event of a vehicle collision and reduces slack by winding webbing before a vehicle collision is to provide

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

In order to achieve the above object, the pre-tensioning module according to the present invention is a driving 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 driving motor to the spindle, and the power transmission unit is disposed side by side along the same direction as the spindle and transmits rotational force according to the rotational direction of the driving motor. A rotational force generated from the drive motor is transmitted to the spindle so that the webbing can be wound or drawn out by including a clutch unit that transmits or blocks and a transmission gear that transmits rotational force transmitted from the clutch unit to the spindle, Characterized in that it performs a clutch on / off function to block rotational force.

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

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

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

Therefore, according to the present invention, the effect that the pre-tensioner module can be applied even when the size in the radial direction is small is obtained.

Further, according to the present invention, the effect that the travel gear can be linearly reciprocated along the axial direction of the shaft using the thread formed on the shaft is obtained.

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

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

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

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 FIG. 2 is a view showing a state in which the seat belt retractor shown in FIG. 1 is installed on a seat of a vehicle. 2(a) shows a front view of the sheet, and FIG. 2(b) shows a rear view of the sheet.

Hereinafter, the direction toward the steering wheel based on the seat of the vehicle is referred to as 'front (F)', and the opposite direction is referred to as 'rearward (B)'. In addition, terms indicating directions such as 'left (L)', 'right (R)', 'upper (U)' and 'downward (D)' are based on the aforementioned front (F) and rear (B) It is defined as pointing in each direction.

As shown in FIGS. 1 and 2, in the seat belt retractor 10 to which the pre-tensioning module is applied according to a preferred embodiment of the present invention, the seat belt webbing (hereinafter referred to as 'webbing') 21 is wound. A spindle module 20, a sensor module 30 that detects changes in the vehicle's inclination and withdrawal 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 a 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 immediately before a collision occurs.

In this embodiment, each component applied to the seat belt retractor 10 is modularized for each functional block and manufactured by 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 additional function modules. can

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

The sensor module 30 may include an acceleration sensor that detects a change in the pulling out 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 around which the webbing 21 is wound.

The spindle module 20 may operate to wind the webbing 21 when a change in pulling out acceleration of the webbing 21 or a change in inclination of the vehicle due to a vehicle collision occurs.

The spindle module 20 may further provide a function of only retracting the webbing in a certain section to fix the child seat.

Hereinafter, the direction in which the webbing 21 is pulled out is set to the upper direction (U), and the direction in which the spindle 22 is mounted is set to the forward and backward directions (F, B).

In this embodiment, the thickness of the seat belt retractor 10, that is, the width in the front and rear direction, is minimized in order to be mounted on a slim seat.

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

Each module is disposed 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, with the spindle module 20 as the center.

For example, as shown in FIGS. 1 and 2 , the sensor module 30, the emergency tensioning module 40, and the pre-tensioning module 50 may be respectively disposed above the spindle module 20. .

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 power or receive power through a power transmission unit such as a gear .

The emergency tensioning module 40 operates an inflator (not shown) containing gunpowder in response to a detection signal that detects a collision of a vehicle, and winds the webbing 21 around the spindle 22 using the pressure of gas generated. give. Accordingly, the emergency tensioning unit 40 reduces the slack of the webbing 21 by winding the webbing 21 in the event of a vehicle collision, thereby reducing injuries to passengers.

When a vehicle collision is predicted through a sensor applied to the vehicle, the pre-tensioning module 50 winds the webbing 21 around the spindle 22 by driving a motor capable of normal and reverse rotation. That is, the pre-tensioning module 50 keeps the worn webbing 2 taut and the webbing 21 loosened until a stronger acceleration or deceleration of the vehicle occurs without an accident under normal driving conditions. It is possible to reduce the possibility of injury to passengers by reducing the slack of the webbing 21 by winding the webbing 21 immediately before a vehicle collision.

Meanwhile, first and second brackets 27 and 28 may be coupled to the front and rear sides of the spindle module 20 to function as the housing 23 by being coupled to each other.

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. In addition, coupling members coupled to each other 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. can be provided.

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

The guide member 29 serves to guide the webbing 21 to be drawn upward. The guide member 29 is a roller whose front and rear ends are rotatably coupled to the first and second brackets 27 and 28 so that the webbing 21 can be smoothly wound or drawn out from the spindle 22. can be provided with

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

In FIG. 2 , a mounting space 13 in which the seat belt retractor 10 is mounted may be provided in the backrest 12 of the seat 11 .

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

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

On the other hand, in FIG. 2, the mounting space 13 is shown in the center of the upper end of the backrest 12, but the present invention is not necessarily limited thereto, and is formed at a position spaced downward by a predetermined interval from the upper end of the backrest 12 Or, it may be formed biased to the left or right from the center of the isotropic (12).

A space in which the webbing 21 is disposed toward the webbing guide 14 may communicate with one side of the mounting space 13 .

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

Here, the webbing 21 is drawn out of the backrest 12 through the mounting space 13 and the placement space 15 in a state in which both ends are wound around the spindle 22 in the forward and backward directions, and the webbing guide 14 As a result, the drawing direction may be changed so that both ends are approximately directed in the left and right directions.

That is, the pull-out 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 the left-right direction.

At the same time, the webbing 21 may have a drawing angle adjusted according to the position of the webbing guide 14 .

For example, the webbing 21 is arranged so as to face the upper left side or upward when viewed from one side of the backrest 12, FIG. 10, as shown in FIG. 10, when an adult occupant on the driver's seat 11 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 the webbing guide 14 installed on the backrest 12 is drawn upward toward

On the other hand, when the occupant on the seat 11 is a woman, teenager, or infant who has a smaller physique than 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 corner of the backrest 12.

For example, when the occupant adjusts the angle of the backrest by rotating the backrest backward, the webbing may be caught on the occupant's neck or shoulder, causing inconvenience.

In addition, it is necessary to adjust the drawing angle of the webbing 21 according to the physical condition of the occupant, that is, the occupant's body shape or purpose of use, such as when adults, teenagers, or infants board or when a child seat is installed.

Thus, an adjusting member (not shown) is installed in the webbing guide 14 so as to be movable within a predetermined range from the upper surface of the backrest 12 to the upper left side of the backrest 12, and the webbing 21 is guided according to the position of the adjusting member. The drawing angle is adjusted by rotating the member 29 as a rotating shaft.

As described above, according to the present invention, the webbing wound around the spindle is drawn out through one side of the first and second brackets, and the webbing drawn out angle can be freely adjusted inside the mounting space of the backrest.

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

At this time, when the webbing 21 is pulled out of the spindle module 20, both ends are arranged to face the front and rear directions, and when pulled out through the placement space 15 and the webbing guide 14, the webbing 21 rotates in one direction so that both ends It is pulled out in a state in which it is arranged so as to face the left-right direction.

In this way, the present invention can minimize the width in the front-back direction when the webbing is mounted on the backrest of the seat by changing the arrangement direction of the spindle around which the webbing is wound.

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

In addition, the present invention can freely adjust the drawing direction and angle of the webbing drawn 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 is applied to variously changed 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 .

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

As shown in FIGS. 1 to 5 , the pre-tensioning module 50 includes a drive motor 51 that generates rotational force to wind or unwrap the webbing 21 and a drive motor depending on whether or not the webbing 21 is wound ( and a power transmission unit 52 for selectively transmitting or blocking the rotational force generated in 51) to the spindle 22.

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

The driving motor 51 may rotate in a 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 in order to smoothly withdraw the webbing 21 during normal driving of the vehicle, and drives the webbing 21 to be wound immediately before a collision occurs. A control signal may be generated to rotate the motor 51 in the opposite direction.

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

As described above, as the present invention arranges the drive motor along the left and right directions orthogonal to the spindle, even if the diameter or length of the drive motor increases to increase the capacity of the drive motor, the effect on the width of the seat belt retractor in the front and rear direction can be removed.

An output shaft of the driving motor 51 and a driving gear 511 installed on the output shaft may be disposed at a left end of the driving 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 drawn out, and when the pre-tensioning module 50 is not operating, the webbing 21 It performs a clutch on/off function to block the rotational force of the drive motor 51 so that it can be drawn out smoothly.

In detail, the power transmission unit 52 is disposed parallel to the top of the spindle 22 along the same direction as the spindle 22 and transmits or blocks rotational force according to the rotation direction of the drive motor 51. (53) and a transmission gear (54) for transmitting rotational force transmitted from the clutch unit (53) to the spindle (22).

The clutch unit 53 is formed in a substantially cylindrical shape with an open front and includes a housing 61 rotated by the rotational force of the driving motor 51, a shaft 62 disposed inside the housing 61, and a shaft 62. It may include a travel gear 63 linearly reciprocating by a rotational motion and a head 64 engaged with the travel gear 63 to receive rotational force.

Along with this, the power transmission unit 52 is engaged with the driving gear 511 and the head gear 641 installed at the rear end of the first connection gear 55 and the header 64 that transmits rotational force to the housing 61 and A meshing second connection gear 56 may be further included.

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

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

To this end, one or more coupling grooves to which one or more 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 an outer circumferential surface of the housing 61 to receive rotational force from the first connection gear 55 . Thus, the housing 61 may rotate by receiving rotational force generated from the drive motor 51 through the first connection gear 55 .

In addition, a plurality of ribs 612 on the inner circumferential surface of the housing 61 are engaged with a plurality of protrusions 633 of the travel gear 63 to be described below so that the rotational force of the housing 61 can be transmitted to the travel gear 63 may protrude.

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

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

A plurality of threads 621 are formed on the outer circumference of the shaft 62 so as to be screwed with the travel gear 63, and the head 63 is prevented from moving forward on the rear side of the plurality of threads 621. A step 622 for fixing the position of may be formed.

The travel gear 63 is formed in a substantially cylindrical shape with front and rear openings so that the shaft can be coupled therein, and a plurality of threads 621 formed on the outer circumferential surface of the shaft 62 on the inner circumferential surface of the travel gear 63 A plurality of screw threads 631 corresponding to may be formed. So, as shown in FIG. 5 , the travel gear 63 rectilinearly reciprocates along the forward and backward directions according to the rotational direction of the shaft 62 inside the housing 61 .

The travel gear 63 is engaged 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. function to

To this end, a first connection part 632 and a second connection part 642 having a plurality of teeth so as to be engaged with each other may be provided at the rear end of the travel gear 63 and the front end of the head 64, respectively.

A plurality of locking protrusions 633 caught on a plurality of ribs 612 formed on an inner circumferential surface of the housing 61 may protrude from the outer circumferential surface of the travel gear 63 .

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

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

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

The elastic member 66 may be fixed so that the travel gear 63 and the head 64 do not move or flow backward and forward, respectively, by using elastic force in normal times.

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

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

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

The second connection gear 56 includes a first gear part 561 having a plurality of teeth meshing with the head gear 641 formed on an outer circumferential surface and a second gear part having a plurality of teeth meshing with the transmission gear 54 formed on the outer circumferential surface. (562).

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

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

As such, the present invention may implement a clutch function to transmit or block rotational force generated from a driving motor provided in the pre-tensioning module to the spindle.

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

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

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

Next, the coupling relationship and operation 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 opened front of the housing 61. The cover 65 is coupled 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 as described above, the housing gear 611 formed on the outer circumferential 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.

Subsequently, the operator assembles the drive motor 51 and the transmission gear 54 to be meshed 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 of transmitting the rotational force generated from the drive motor 51 to the spindle 22 along the rotational direction of the drive motor 51 and the rotational force. It performs a clutch off function to block transmission to the spindle 22.

For example, FIG. 6 is a diagram showing an operating state of a 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 circumferential surface of the shaft 62 moves backward and engages with the head 64 .

In the state where the travel gear 63 and the head 64 are engaged in this way, if the housing 61 continuously rotates clockwise, the rotational force of the housing 61 and the shaft 62 is the head gear of the head 64 ( 641) and the second connection gear 56 to rotate the transmission gear 54 clockwise.

Through this process, the clutch unit 53 may provide a clutch-on function of transmitting rotational force generated from the drive motor 51 to the spindle 22 .

Meanwhile, when the driving motor 51 rotates in the opposite direction 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 continuously rotates counterclockwise, the rotational force of the housing 61 and the shaft 62 is not transmitted to the transmission gear 54 and Blocked.

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

Through the process as described above, it is possible to implement a clutch on/off function to transmit or block the rotational force generated by the driving motor provided in the pre-tensioning module to the spindle.

That is, the present invention may provide a clutch function to transmit or block rotational force generated from a driving motor to a spindle by using a clutch unit disposed in the same direction as the spindle.

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

In addition, according to the present invention, the travel gear can be linearly reciprocated along the axial direction of the shaft by using a screw thread formed on the shaft.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

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

Also, in the above embodiment, it has been described that the spindle arrangement direction and the webbing withdrawal direction are perpendicular, but the present invention is not necessarily limited thereto, and the spindle arrangement direction and the webbing withdrawal direction may vary depending on the surrounding conditions in which the spindle is installed. It may be altered to form a non-rectangular direction, for example 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 thereto, and may be variously changed. may be

The present invention is applied to a pre-tensioning module that implements a clutch on/off function to transfer or block rotational force generated from a drive motor provided in the pre-tensioning module to a spindle and a seat belt retractor technology to which the pre-tensioning module 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: withdrawal space
26: connecting member 27,28: first and second brackets
29: guide member
30: sensor module
40: emergency tensioning module
50: pre-tensioning module
51: drive motor 511: drive gear
52: power transmission unit 53: clutch unit
54: transmission gear
55: first connecting gear 551,552: first and second gears
56: second connection gear 561,562: first and second gear parts
61: housing 611: housing gear
612: rib
62: shaft 621: thread
622: step
63: travel gear 631: thread
632: first connection part 633: obstacle part
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 seat belt webbing (hereinafter referred to as 'webbing') on the spindle, and
And a power transmission unit for selectively transmitting or blocking the rotational force generated by the driving motor to the spindle depending on whether the webbing is wound,
The power transmission unit is arranged side by side along the same direction as the spindle and transmits or blocks rotational force according to the rotational direction of the drive motor; and
Including a transmission gear for transmitting the rotational force transmitted from the clutch unit to the spindle
The pre-tensioning module, characterized in that it transmits the rotational force generated by the drive motor to the spindle so that the webbing can be wound or drawn out, and performs a clutch on/off function to block the rotational force of the drive motor. According to claim 1,
The clutch part is formed in a cylindrical shape with one surface opened and rotates forward and backward by the rotational force of the driving motor;
A shaft disposed inside the housing,
A travel gear that linearly reciprocates by the rotational motion of the shaft, and
A head engaged with the travel gear to receive rotational force,
The pre-tensioning module, characterized in that the travel gear is screwed to the outside of the shaft and coupled to the head to transmit rotational force or separated from the head to block transmission of rotational force according to the rotational direction of the shaft. According to claim 2,
The power transmission unit meshes with a driving gear installed on the output shaft of the driving motor and transmits rotational force to the housing; and
Further comprising a head gear installed at one end of the header and a second connection gear engaged with the transmission gear to transmit rotational force,
The first connection gear is a first gear meshed with the driving gear and
and a second gear installed on the same axis as the first gear and engaged with a housing gear formed on an outer circumferential surface of the housing. According to claim 3,
The second connection gear includes a first gear part having a plurality of teeth meshing with the head gear formed on an outer circumferential surface thereof;
A pre-tensioning module comprising a second gear portion having a plurality of teeth meshing with the transmission gear formed on an outer circumferential surface thereof. According to claim 2,
A first connection part and a second connection part having a plurality of teeth engaged 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 providing an 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. Pre-tensioning module, characterized in that . According to claim 2,
A plurality of ribs are formed on the outer circumferential surface of the housing,
A pre-tensioning module, characterized in that a plurality of locking portions caught on the plurality of ribs are formed on the inner surface of the travel gear. In the seat belt retractor to which the pre-tensioning module according to any one of claims 1 to 6 is applied,
A spindle module including a spindle on which the webbing is wound, and
A pre-tensioning module for reducing slack by winding the webbing immediately before a vehicle crash occurs,
The seat belt retractor to which the pre-tensioning module is applied, characterized in that the spindle is disposed along the front-rear direction of the vehicle corresponding to the thickness direction of the backrest in the mounting space formed on the backrest of the seat. According to claim 7,
A sensor module that detects changes in vehicle inclination and webbing withdrawal acceleration
An emergency tensioning module that reduces slack by winding the webbing in the event of a vehicle collision,
The spindle module and the pre-tensioning module are modularized and manufactured for each functional block,
A seat belt retractor with a pretensioning module, characterized in that each module is selectively combined with the spindle module.

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