KR20130012694A - Retractor and seat belt therewith - Google Patents

Abstract

PURPOSE: A retractor and a seat belt with the same are provided to secure enough space as the releasing length of a lock bar is shortened so that the lock bar and a slider are easily assembled. CONSTITUTION: A retractor comprises a winding shaft, a motor, a housing unit, and a clutch unit(400). Webbing restricting a passenger is wound in the winding shaft. The clutch unit is received in the housing unit and selectively transmits the torque of the motor. The clutch unit comprises a circular clutch wheel, a base plate(420), a ratchet(430), lock bars(440), a torsion spring, a rotation restricting boss(460), a clutch cover(470), and a drive plate(480). The clutch wheel receives the torque of the motor. The ratchet is coaxially joined to the one end of the winding shaft. The lock bar is joined to a lateral surface of the base plate to be rotatable and one end of the lock bar is locked to or released from the ratchet. The torsion spring provides a spring force to a direction of releasing the end of the lock bar from the ratchet. The rotation restricting boss is protruded in the lateral surface of the base plate in order to restrict the rotational length in the direction of releasing the end of the lock bar from the ratchet. The other lateral surface of the clutch cover is joined to the lateral surface of the base plate. The drive plate includes a slider which pushes or releases the end of the lock bar while sliding on the other lateral surface of the clutch cover.

Description

Retractor and seat belt with same {RETRACTOR AND SEAT BELT THEREWITH}

The present invention relates to a retractor equipped with a motor that is operable to retract the webbing in accordance with a preventive safety and collision prediction situation, and more specifically, the lock bar and the slider of the clutch unit for transmitting the rotational force of the motor to the winding shaft in which the webbing is wound. It relates to a retractor and a seat belt having the same to improve the assembly of the ratchet and to increase the accuracy of the locking and release operation between the ratchet and the lock bar to ensure reliability.

In general, the vehicle is provided with a seat belt in the seat in order to ensure the driving safety of the passenger, such as the driver. That is, the seat belt installed in the vehicle is configured to prevent the occupant from jumping out of the vehicle body while restraining the occupant's body in order to prevent the secondary collision and reduce the impact. The most common form of such a seat belt is a three-point seat belt is a combination of a shoulder restraint shoulder belt and a waist restraint wrap belt.

As shown in FIG. 1, the seat belt 1 generally includes a webbing 10 having a belt shape that fixes a passenger, a retractor 20 on which the webbing 10 is wound, and the webbing 10. It consists of a belt tongue 30 coupled to the drawn end of the belt tongue 30, the belt tongue 30 is detachably inserted.

The webbing 10 prevents the occupant's body from tumbling forward or deviating from the seat due to driving inertia when the vehicle is suddenly stopped or overturned due to a collision accident, and the buckle 40 is a webbing 10. It is possible to fix the belt tongue (30) from which the pulled out to the vehicle body.

The retractor 20 is a device for winding the webbing 10. The retractor 20 allows the webbing 10 to be pulled out when the occupant wears the webbing 10, but has a large force on the webbing 10 due to a vehicle collision. When the hooking is taken out abruptly, the locking of the webbing 10 is suppressed, and an ELM (Emergency Locking Mechanism) is provided to prevent the occupant from being pulled forward of the seat while wearing the webbing 10. As described above, the retractor 20 having the ELM is referred to as an emergency locking retractor (ELR), and the ELM is a general retractor 20.

In addition, the retractor 20 suppresses the withdrawal of the webbing 10 by operating the ELM as the webbing 10 is rapidly drawn out when an accident occurs due to a vehicle collision, etc. Will move forward. That is, with the operation of the ELM in the state in which the webbing 10 is drawn out to a certain length, further webbing 10 is pulled out. However, if the occupant touches the airbag before the airbag bursts as the occupant moves forward by the withdrawal length of the webbing 10 until the ELM is activated, the airbag will not swell properly and the airbag will inflate. Ascending, can induce rider choking. In order to solve this problem, a pretensioner is installed in the retractor 20. The pretensioner is also known in the prior art to prevent the occupant from forwarding during a vehicle collision, the piston is activated by the gas generation due to the ignition of the gunpowder to draw the webbing (10) sharply pull back again when the occupant is forward Giving functions.

As described above, the general retractor 20 including the ELM or the retractor 20 including the pretensioner also restrains the occupant based on suppression or withdrawal of the webbing 10 when an accident occurs due to a vehicle collision or the like. Accordingly, the withdrawal of the webbing 10 is blocked, so that all the loads through the webbing 10 are concentrated on the occupant, resulting in a large impact, and the occupant feels severe pressure such as breaking the ribs of the occupant. In order to relieve the pressure of the occupant is installed a load limiter (Load Limiter) in the retractor 20. The load limiter is also a conventionally well-known configuration, and when the ELM or the pretensioner operates, if the webbing 10 is subjected to a certain load or more, the webbing 10 is pulled out by a certain amount to reduce the impact on the occupant through the webbing 10 step by step. Do it. The load limiter is configured such that the webbing 10 is drawn out in stages as much as the torsional deformation of the torsion bar while the torsion bar provided at the inner center of the winding shaft for drawing the webbing 10 is twisted.

As described above, the retractor 20 provided with the pretensioner, the load limiter, etc. as well as the general retractor 20 provided with the ELM is widely known. Moreover, recently, there is also a retractor 20 equipped with a motor to operate in accordance with the above functions as well as preventive safety and collision prediction. That is, the motor-driven retractor 20 detects the distance to another vehicle or obstacle in front of the vehicle by using a front monitoring device such as a distance sensor. The winding shaft is rotated in the retraction direction I of the webbing 10 with the rotational force of. Accordingly, the webbing 10, which is poor or slightly loosened by the occupant, is introduced into the rotational force of the motor to stabilize the occupant's posture, thereby ensuring safety. At this time, the clutch unit is installed to transmit the rotational force of the motor to the take-up shaft.

Figure 2 is an exploded perspective view showing the clutch portion of the retractor according to the prior art (Patent Document 1), Figures 3 and 4 is a front view showing the operation of the clutch portion coupled to the embodiment of FIG.

The retractor 20 according to the related art has a winding shaft 21 in which a webbing 10 restraining a passenger is retractably wound and the winding shaft 21 in the pulling direction I of the webbing 10. It comprises a motor (not shown) for transmitting a rotational force to the clutch unit 22 is interposed between the motor and the take-up shaft 21 to selectively transmit the rotational force of the motor to the take-up shaft 21. As shown in FIG. 2, the clutch portion 22 includes a clutch wheel 22a, a ring 22b, a rotor 22c, a ratchet 22d, a lock bar 22e, a slider 22f, and a return spring 22g. And a bushing 22h, washer 22i, retainer 22j, holder 22k and spacer 22l. Coupling and operation of each component constituting the clutch portion 22 are shown in Patent Document 1, so the detailed description thereof will be omitted.

However, in the conventional retractor 20 configured as described above, as shown in FIG. 3, the slider 22f normally pushes one end of the lock bar 22e to press the other end of the lock bar 22e. It is placed in the unlocked state at 22d. At this time, the rotor 22c is relatively moved relative to the slider 22f. The lock bar 22e moves within the predetermined range with respect to the slider 22f. One end of the lock bar 22e is pressed by the slider 22f to lock the lock bar. The other end of 22e resists the spring force of the return spring 22g to be in a latch release state with the ratchet 22d. In the state where the lock bar 22e and the ratchet 22d are released, the rotational force from the motor is not transmitted to the winding shaft 21 coaxially coupled with the ratchet 22d via the clutch wheel 22a.

However, as shown in FIG. 4, when one end of the lock bar 22e is spaced apart from the slider 22f, the slider 22f which has pressed the one end of the lock bar 22e no longer stops, and the return spring 22g The other end of the lock bar 22e is engaged with the ratchet 22d by the spring force of In the state where the lock bar 22e and the ratchet 22d are locked, the rotational force from the motor is transmitted to the ratchet 22d via the clutch wheel 22a via the ring 22b, the rotor 22c, and the lock bar 22e. The rotation of ratchet 22d eventually rotates the take-up shaft 21.

The retractor according to the prior art of the above configuration, when the return spring (22g) to the lock bar (22e) when the return spring (22g), the lock bar (22e) and the slider (22f) is assembled first, the return spring ( 22g) presses the other end of the lock bar 22e, making it difficult to assemble the slider 22f to one end of the lock bar 22e, and in the opposite case, the return spring 22g is difficult to assemble. There is a problem that this is lowered.

In addition, since the spring force of the return spring 22g is provided in the locked state of the lock bar 22e and the ratchet 22d, it is pressed against one end of the arbitrary lock bar 22e by the processing tolerance or other external force of the slider 22f. If there is a release of the webbing 10 by the arbitrary motor by the lock bar 22e and the ratchet 22d by the spring force of the return spring 22g, the other components of the retractor 20 are made. May interfere with the operation or cause malfunctions.

In particular, due to long use, the plastic spring of the return spring 22g or the absence of spring force does not work despite the need for the locking bar 22e and the ratchet 22d, so that the webbing 10 is retracted. There is a fatal problem that it can be a great danger for occupants.

(Patent Document 1) KR 10-2007-0010031 A

An object of the present invention devised to solve the above problems is to improve the assembly of the lock bar and the slider of the clutch portion for transmitting the rotational force of the motor to the winding shaft wound the webbing, the latching and releasing operation between the ratchet and the rock bar It is to provide a retractor and a seat belt having the same that can ensure the reliability by increasing the accuracy of.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to achieve the above object, a retractor according to the present invention includes a winding shaft in which a webbing restricting a passenger is retractably wound and a motor for transmitting rotational force to the winding shaft in a retracting direction in which the webbing is retracted. And a clutch portion accommodated in a housing provided at one end of the winding shaft and interposed between the motor and the winding shaft to selectively transmit rotational force of the motor to the winding shaft, wherein the clutch portion is coaxial with the winding shaft. An annular clutch wheel which is disposed at and receives a rotational force from the motor, a base plate coupled to the inner side of the clutch wheel to rotate together, a ratchet coupled to one end of the winding shaft in a coaxial manner, and rotating together; A lock bar rotatably coupled to one side of the base plate and having one end latched or released from the ratchet; A torsion spring inserted into the rotation center of the bar and providing a spring force in a direction in which one end of the lock bar is released from the ratchet; and a rotation distance in a direction in which one end of the rock bar is released from the ratchet. A rotary limiting boss protruding on one side of the base plate, a clutch cover on which the other side is coupled to one side of the base plate, and a slider for pushing or releasing one end of the lock bar while sliding to the other side of the clutch cover. It includes a drive plate provided with.

In addition, with the clutch cover in between, the other side is coupled to one side of the drive plate and the annular guide ring and the sliding, and the outer ring groove of the guide ring and the clutch cover in an annular shape that one end and the other end is not connected It is inserted into the, one end is fixed to the inside of the housing, the other end is characterized in that it further comprises a friction spring coupled to the drive plate to provide a spring force as opposed to the rotational direction in which the drive plate slides.

In addition, when the winding shaft is rotated in the direction in which the webbing is drawn by the operation of the motor in the state in which the lock bar is locked to the ratchet and is interposed between the inner circumferential surface of the clutch wheel and the outer circumferential surface of the base plate, It characterized in that it further comprises a plate-shaped slip spring to release the coupling of the clutch wheel and the base plate while plastic deformation when excessive rotation force occurs in the direction in which the webbing is drawn out.

On the other hand, the seat belt with a retractor according to the present invention, the belt-shaped webbing to secure the occupant, the retractor is wound the webbing, the belt tongue coupled to the drawn end of the webbing, and the belt A seat belt comprising a buckle in which a tongue is detachably inserted, wherein the retractor is configured to transmit a rotational force to the winding shaft in a direction in which the webbing is retractable and the winding shaft in which the webbing is retractable. And a clutch unit housed in a housing provided at one end of the take-up shaft and interposed between the motor and the take-up shaft to selectively transmit rotational force of the motor to the take-up shaft. An annular clutch wheel disposed coaxially and receiving rotational force from the motor, and a base plate coupled to the inner side of the clutch wheel to rotate together; And a ratchet that is coaxially coupled to one end of the winding shaft and rotates together; a lock bar that is rotatably coupled to one side of the base plate so that one end is caught or released from the ratchet; and a center of rotation of the rock bar. A torsion spring inserted into the lock bar and providing a spring force in a direction in which one end of the lock bar is released from the ratchet and a rotation distance in a direction in which one end of the lock bar is released from the ratchet; A drive provided with a rotation restriction boss protruding on one side, a clutch cover that is coupled to one side of the base plate, and a slider for pushing or releasing one end of the lock bar while sliding to the other side of the clutch cover. It consists of a plate.

In addition, with the clutch cover in between, the other side is coupled to one side of the drive plate and the annular guide ring and the sliding, and the outer ring groove of the guide ring and the clutch cover in an annular shape that one end and the other end is not connected It is inserted into the, one end is fixed to the inside of the housing, the other end is characterized in that it further comprises a friction spring coupled to the drive plate to provide a spring force as opposed to the rotational direction in which the drive plate slides.

The webbing may be interposed between the inner circumferential surface of the clutch wheel and the outer circumferential surface of the base plate, and the webbing may be rotated in a direction in which the webbing is drawn by the operation of the motor while the lock bar is engaged with the ratchet. When the excessive rotational force occurs in the drawing direction characterized in that it further comprises a plate-shaped slip spring to release the coupling of the clutch wheel and the base plate while plastic deformation.

The retractor and the seat belt having the same according to the present invention improve the assemblability of the lock bar and the slider of the clutch portion for transmitting the rotational force of the motor to the winding shaft wound with the webbing, and the accuracy of the locking and releasing operation between the ratchet and the rock bar. Increase the reliability can be secured.

1 is a perspective view showing a general seat belt,
Figure 2 is an exploded perspective view showing the clutch portion of the retractor according to the prior art,
3 and 4 is a front view showing the operation of the clutch unit coupled to the embodiment of FIG.
5 is a perspective view showing an embodiment of a retractor according to the present invention;
Figure 6 is a side cross-sectional view showing an internal coupling state in the embodiment of Figure 5,
7 is a perspective view of main parts of the clutch unit in the embodiment of FIG. 5;
FIG. 8 is an exploded perspective view illustrating the interior of the housing of the clutch unit in the embodiment of FIG. 7;
9 is an exploded perspective view of the embodiment of FIG. 8 seen from the opposite side;
10 and 11 are front views illustrating a state in which the lock bar is released from the ratchet of the clutch unit in the embodiment of 6;
12 and 13 are front views illustrating a state in which a lock bar is engaged with a ratchet of the clutch unit in the embodiment of FIG. 6.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the retractor according to the present invention. 5 to 13, the webbing 10 is not separately illustrated on the winding shaft 100, but the webbing 10 will be described in the state of being wound around the winding shaft 100 with reference to FIG. 1.

The retractor 20 according to the present invention includes a winding shaft 100, a motor 200, a housing 300, and a clutch unit 400, as shown in FIGS. 5 to 13, and the clutch unit 400. 8 and 9, the clutch wheel 410, the base plate 420, the ratchet 430, the lock bar 440, the torsion spring 450, the rotation limiting boss 460, and the clutch cover 470. And a drive plate 480, and may further include a guide ring 490, a friction spring 500, and a slip spring 510.

First, referring to FIGS. 5 and 6, the retractor 20 according to the present invention may include a fixed frame 50, an ELM 60, a pretensioner 70, and a load limiter 80. The fixed frame 50 is composed of a rear wall fixed to the vehicle body, each component is coupled to the mounting, consisting of a cross-section '' ', and the left and right walls through which the winding shaft 100 to be described later through do.

The ELM 60 is coupled to the left wall of the fixed frame 50 in the drawing, but the internal configuration is not shown in the drawing, but allows the withdrawal of the webbing 10 when the occupant wears the webbing 10. However, when a large force is applied to the webbing 10 due to a vehicle collision or the like, the drawing of the webbing 10 is suppressed when the webbing 10 is rapidly drawn out, thereby preventing the occupant from being moved forward of the seat while wearing the webbing 10. .

The pretensioner 70 is installed outside the right wall of the fixed frame 50. Although the detailed configuration is not shown in the drawing, the pretensioner 70 prevents the occupant from moving forward in the event of a vehicle collision. It acts to draw the webbing 10 rapidly and pull back again when the occupant is pulled forward.

The load limiter 80 draws a certain amount of the webbing 10 when the ELM 60 or the pretensioner 70 receives a predetermined load or more during operation of the ELM 60 or the pretensioner 70, thereby gradually stepping the impact on the occupant through the webbing 10. It serves to reduce. As shown in FIG. 6, the load limiter 80 has a torsion bar provided at the center of the take-up shaft 100 that draws in the webbing 10 so that the webbing 10 may be drawn out stepwise as much as the torsional deformation of the torsion bar. It is composed.

As described above, detailed configurations and operations of the ELM 60, the pretensioner 70, and the load limiter 80 of the retractor 20 according to the present invention can be implemented in the prior art, and thus, a detailed description thereof will be omitted. Among the motor-driven retractors, which are a feature of the invention, the configuration and operation of the clutch unit will be discussed.

Winding shaft 100 is also referred to as a spool (spool), as shown in Figures 5 to 13, the webbing 10 that binds the occupant is wound retractable. The winding shaft 100 is rotatably mounted to the fixed frame 50, and both ends of the winding shaft 100 are rotatably coupled to the left and right walls of the fixed frame 50.

As shown in FIGS. 5, 6, 12, and 13, the motor 200 transmits rotational force to the winding shaft 100 in the direction I in which the webbing 10 is retracted. The motor 200 is an electric rotary motor, and operates according to a preventive safety and collision prediction situation. For example, when the distance to another vehicle or obstacle in front is detected by a front monitoring device such as a distance sensor, and the distance to the vehicle or obstacle in front of the vehicle is less than a predetermined value, the motor 200 is operated to generate a rotational force of the motor 200. The winding shaft 100 is rotated in the retraction direction I of the webbing 10. Accordingly, the webbing 10, which is poor or slightly loosened by the occupant, is introduced into the rotational force of the motor 200 to stabilize the occupant's posture. The rotational force of the motor 200 is transmitted to the ratchet 420 via the clutch wheel 410 and the lock bar 430 of the clutch unit 400, which will be described later, and the winding shaft 100 coupled coaxially with the ratchet 420. ) Will rotate. However, even here, the rotational force of the motor 200 is not directly transmitted to the clutch wheel 410, but the rotational force of the motor 200 is decelerated and transmitted to the clutch wheel 410 through the gear unit 210. The configuration of the gear unit 210 is a plurality of reduction gears are meshed, it is sufficient if the gear unit 210 can connect the outer shaft of the motor 200 and the clutch wheel 410, the gear unit 210 It does not matter what kind or form of each reduction gear.

As shown in FIGS. 5 to 7, the clutch unit 400 is accommodated in a housing 300 installed at one end of the winding shaft 100, and is interposed between the motor 200 and the winding shaft 100. The rotational force of the motor 200 is selectively transmitted to the winding shaft 100. The housing 300 serves to protect, mount, and receive the clutch unit 400 from the outside, as shown in FIG. 7. Detailed configuration of the clutch unit 400 as described above is shown in Figures 8 and 9 clutch wheel 410, base plate 420, ratchet 430, lock bar 440, torsion spring 450, rotation Consisting of the boss 460, the clutch cover 470 and the drive plate 480, and may further include a guide ring 490, friction spring 500 and slip spring (510).

As illustrated in FIGS. 8 to 13, the clutch wheel 410 is disposed coaxially with the winding shaft 100 and receives a rotational force from the motor 200. In more detail, the clutch wheel 410 has a gear unit 210 connected to a rotation shaft of the motor 200 connected to an outer tooth of the clutch wheel 410, and the rotational force of the motor 200 controls the gear unit 210. It is transmitted to the clutch wheel 410 through.

The base plate 420 is coupled to the inside of the clutch wheel 410 and rotates together as shown in FIGS. 8 to 13. That is, the base plate 420 is coupled to the inner side of the clutch wheel 410 to rotate together with the clutch wheel 410 received the rotational force from the motor 200. The base plate 420 is coupled to the lock bar 440 to be described later, so that the rotational force of the motor 200 is provided to rotate the lock bar 440 via the clutch wheel 410 and the base plate 420.

The ratchet 430 is to transfer the rotational force of the motor 200 to the take-up shaft 100 as shown in FIGS. 8 to 13, and is coaxially coupled to one end of the take-up shaft 100 together. Rotate The inner circumferential surface of the ratchet 430 and the outer circumferential surface of the take-up shaft 100 are splined together to rotate together, and the locking bar 440 to be described later is caught or released by the ratchet 430 so that the rotational force of the motor 200 is the lock bar 440. By or is not transmitted to the ratchet 430 through) it is possible to prevent the motor 200 to rotate or rotate the take-up shaft (100).

The lock bar 440 is to transmit the rotational force of the clutch wheel 410 to the ratchet 420, and is rotatably coupled to one side of the base plate 420 so that one end thereof is caught or caught by the ratchet 430. Is released. 10 and 11, the lock bar 440 is normally released from the ratchet 420. In this case, the lock bar 440 passes through the clutch wheel 410 and the base plate 420 from the motor 200. The rotational force is not transmitted to the ratchet 430 through, and, of course, the motor 200 does not rotate. However, as shown in FIGS. 12 and 13, the lock bar 440 rotates by the rotation of the clutch wheel 410 and the base plate 420 together with the rotation of the motor 200, and the slider of the drive plate 480 to be described later. When one end of the lock bar 440 is pressed by the 481, one end of the lock bar 440 is caught by the ratchet 430. At this time, the rotational force is transmitted to the ratchet 430 from the motor 200 via the clutch wheel 410 and the base plate 420 through the lock bar 440.

A torsion spring 450 is installed so that the release speed can be accelerated when one end of the lock bar 440 is latched again as shown in FIGS. 10 and 11. If the lock bar 440 is not quickly and smoothly released from the ratchet 430, even if a small external force acts in the withdrawal direction of the webbing 10, the lock bar 440 is locked to the ratchet 430. Since it is not released, the rotational force of the motor 200 is still maintained in the inflow direction (I) of the webbing 10, so that there is a great risk for the safety of the occupant due to breakage or malfunction caused by interference with the operation of other devices. Can be. Therefore, the torsion spring 450 is inserted into and installed at the rotation center of the lock bar 440, and provides a spring force in a direction in which one end of the lock bar 440 is released from the ratchet 430. That is, the locking release state of the lock bar 440 with respect to the ratchet 430 may be maintained by the spring force of the torsion spring 450, and the drive to be described later when the webbing is driven by the driving of the motor 200 in the locked state. The slider 481 of the plate 480 presses one end of the lock bar 440 to maintain the latched state with the ratchet 430.

When one end of the lock bar 440 is provided with a spring force by the torsion spring 450 to release the latch of the ratchet 430, that is, one end of the lock bar 440 springs in the radial direction of the base plate 420. When the force is applied, it is inconvenient because the torsion spring 450 must be assembled in a compressed state by pressing one end of the lock bar 440 during assembly with the slider 481 of the drive plate 480 which will be described later. Furthermore, in the case of the slider 481, when the sliding distance becomes longer than the design distance due to the processing tolerance or the assembly tolerance, one end of the lock bar 440 is pushed in the radial direction of the base plate 420, and the lock bar 440 with the slider 481. If one end of) cannot be pressed or a time difference occurs, the correct operation may not be performed. Therefore, the lock bar 440 and the slider 481 are secured for ease of assembly, and the rotation limit boss 460 is provided to limit the rotation limit angle of the lock bar 440 to achieve precise operation. As shown in FIGS. 8 to 13, the rotation limit boss 460 has one side surface of the base plate 420 so as to limit a rotation distance in a direction in which one end of the lock bar 440 is released from the ratchet 430. Protruding to is formed. The protrusion forming position of the rotation limiting boss 460 with respect to the base plate 420 is a minimum from the state in which the lock bar 440 is caught by the ratchet 430 and the state in which the lock bar 440 is released by the ratchet 430. As a distance, the lock bar 440 after the release is to prevent the rotation further in the radial direction of the base plate 420 to shorten the engagement and release distance. In addition, since the locking release distance of the lock bar 440 is shortened, the slider 481 of the drive plate 480 to be described later is easily assembled since sufficient space is maintained in the state in which the lock bar 440 is not depressed.

The clutch cover 470 is coupled to one side of the base plate 420 so that various components between the base plate 420 and the clutch cover 470 are not exposed to the outside. It is. Coupling of the clutch cover 470 and the base plate 420 is fixed by the cover bolt 471.

The drive plate 480 controls the operation of the lock bar 440 through the slider 481 in order to selectively transmit the rotational forces of the clutch wheel 410 and the base plate 420 to the ratchet 430. will be. As shown in FIGS. 8 to 13, the drive plate 480 is provided with a slider 481 for pushing or releasing one end of the lock bar 440 while the other side slides to the other side of the clutch cover 470. . That is, the drive plate 480 is rotatably sliding by the sliding distance of the slider 481 between the clutch cover 470 and the base plate 420, pressing one end of the lock bar 440 through the slider 481 or Release. More specifically, when the rotational force is transmitted from the motor 200 to the clutch wheel 410 and the base plate 420 in the inlet direction (I) of the webbing 10, the drive plate 480 also rotates by sliding by frictional force. The slider 481 provided in the drive plate 480 also rotates and simultaneously presses one end of the lock bar 440 to lock the lock bar 440 to the ratchet 430. On the contrary, when the driving of the motor 200 stops, the rotational force of the webbing 10 in the pulling direction I disappears, so that one end of the lock bar 440 is caught from the ratchet 430 by the spring force of the torsion spring 450. When the drive plate 480 is also reversed, the slider 481 releases one end of the lock bar 440.

The drive plate 480 may further include a guide ring 490 and a friction spring 500 to facilitate the reverse rotation of the drive plate 480 so that the slider 481 may easily release one end of the lock bar 440. That is, as illustrated in FIGS. 8 to 13, the guide ring 490 is annularly sandwiched between the clutch cover 470, and the other side of the guide plate 480 is slid together while sliding with one side of the drive plate 480. The shunt spring 500 is inserted into the outer circumferential groove of the guide ring 490 and the clutch cover 470 in an annular shape where one end and the other end are not connected, and one end is fixed inside the housing 300, and the other end is It is coupled to the drive plate 480 to provide a spring force as opposed to the sliding direction of the drive plate 480. In more detail, when a rotational force is transmitted from the motor 200 to the clutch wheel 410 and the base plate 420 in the direction in which the webbing 10 is drawn in, the drive plate 480 also rotates in sliding due to frictional force. The slider 481 provided at 480 also rotates and simultaneously presses one end of the lock bar 440 such that the lock bar 440 is caught by the ratchet 430. At this time, the guide ring 490 is rotated while sliding together coupled with the drive plate 480, with the clutch cover 470 between, the spring force in the reverse rotation direction to the friction spring 500 by the rotated angle Stored. On the contrary, when the driving of the motor 200 stops, the rotational force of the webbing 10 in the pulling direction I disappears, so that one end of the lock bar 440 is caught from the ratchet 430 by the spring force of the torsion spring 450. And the spring force in the reverse rotation direction by the friction spring 500 is provided to the drive plate 480 and the guide ring 490 so that the slider 481 releases one end of the lock bar 440. To make it easier.

On the other hand, a collision accident occurs in the state in which the motor 200, which detects the occurrence of the accident, is driven, and a large load is generated on the webbing 10 as the occupant is sharply moved forward after the pretensioner 70 is operated. At this time, the load limiter 80 is operated to draw out the webbing 10 step by step. If the webbing 10 is continuously drawn in by the driving of the motor 200, the load limiter 80 may be smoothly operated. In addition to being disturbed, the gear unit 210 that transfers power from the motor 200 and the motor 200 to the clutch wheel 410 is overloaded. Such an overload is called an overload, and a slip spring 510 is installed as shown in FIGS. 8 to 13 to release the overload. That is, the slip spring 510 is a plate-shaped spring is pressed between the inner circumferential surface of the clutch wheel 410 and the outer circumferential surface of the base plate 420, the lock bar 440 is caught in the ratchet 430 Plastic deformation when excessive rotational force occurs in the direction in which the webbing 10 is pulled out while the winding shaft 100 rotates in the pulling direction I of the webbing 10 by the operation of the motor 200. While releasing the coupling of the clutch wheel 410 and the base plate 420. Therefore, when the coupling between the clutch wheel 410 and the base plate 420 is released by the plastic deformation of the slip spring 510, the rotational force from the motor 200 acts only on the clutch wheel 410, the base plate 420 The clutch wheel 410 is turned against. As a result, the rotational force of the motor 200 and the clutch wheel 410 is not transmitted to the base plate 420, and even if the lock bar 440 is locked to the ratchet 430, The rotational force is not transmitted to the take-up shaft 100, and the rod limiter 80 is smoothly operated. The slip spring 510 for releasing the overload as described above should be replaced by repair and replacement when an accident occurs due to a collision as a single use.

8 and 9, components not denoted by reference numerals function as bushings or spacers for ensuring smooth rotation and space with other components in contact with each other, and a detailed description thereof will be omitted.

The operation of the retractor 20 of the present invention configured as described above will be described in detail with reference to FIGS. 10 to 13.

As shown in FIGS. 5 and 6, the motor 200 transmits rotational force to the clutch wheel 410 of the clutch unit 400 via a gear unit 210 formed of a plurality of reduction gears. The rotational force transmitted to the clutch wheel 410 is transmitted to the ratchet 430 through the base plate 420 and the lock bar 440 rotating together with the clutch wheel 410 as shown in FIGS. 12 and 13. Rotate). Since the ratchet 430 is coaxially coupled with the take-up shaft 100, the rotation of the ratchet 430 leads to the rotation of the take-up shaft 100. As a result, the rotational force of the motor 200 is connected to the winding shaft 100 via the gear unit 210, the clutch wheel 410, the base plate 420, the lock bar 440, and the ratchet 430.

The clutch unit 400 is provided to selectively transmit the rotational force of the motor 200 to the winding shaft 100 finally, as shown in FIGS. 10 and 11 because the motor 200 does not always rotate. As described above, the lock bar 440 and the ratchet 430 are normally placed in a released state.

As described above, when the collision prediction situation occurs due to the operation of the sensor or the like, the signal is electrically transmitted to the motor 200 to drive the motor 200. As shown in FIGS. 12 and 13, the driving of the motor 200 is to rotate the winding shaft 100 in the direction I in which the webbing 10 is retracted.

That is, as shown in FIGS. 10 to 13, when the motor 200 rotates, the clutch wheel 410 and the base plate 420 rotate through the gear unit 210. The lock bar 440 rotates together with the rotation of the clutch wheel 410 and the base plate 420, and one end of the lock bar 440 is pressed while moving below the slider 481. At this time, the slider 481 also rotates by the sliding distance of the slider 481 while sliding together with the drive plate 480. The rotation of the drive plate 480 is made to receive a spring force in the reverse rotation direction of the friction spring 500, the spring force of the friction spring 442 is the lock bar 440 of the slider 481 It acts in the process of releasing the press on.

When one end of the lock bar 440 is pressed while moving below the slider 481, the lock bar 440 is caught by the ratchet 430. Therefore, the rotational force of the clutch wheel 410 is transmitted to the ratchet 430 caught by the lock bar 440, and the winding shaft 100 rotates with the rotation of the ratchet 430.

On the contrary, the motor 200 stops rotating when it exits the collision prediction situation, and will be switched from the state of FIGS. 12 and 13 to the state of FIGS. 10 and 11. At this time, when the rotational force is no longer transmitted from the motor 200 to the clutch wheel 410, the drive plate 440 is returned to the rotation by the spring force provided by the spring force in the reverse rotation direction of the friction spring 500. . The slider 481 also rotates with the drive plate 480 to release the force to press the lock bar 440, and the spring force of the torsion spring 450 acts to lift the lock bar 440. Accordingly, the lock bar 440 and the ratchet 430 are in a released state as in the normal state of FIGS. 10 and 11.

On the other hand, when a collision accident occurs that is not a case out of the collision prediction situation, after the pretensioner 70 is operated, the occupant is sharply moved forward, and a large load is generated in the webbing 10. At this time, the load limiter 80 is operated to draw out the webbing 10 step by step. If the webbing 10 is continuously drawn in by the driving of the motor 200, the load limiter 80 may be smoothly operated. In addition to being disturbed, the gear unit 210 that transfers power from the motor 200 and the motor 200 to the clutch wheel 410 is overloaded. When such an overload, that is, an overload occurs, the slip spring 510 shown in FIGS. 12 and 13 is plastically deformed to release the coupling between the clutch wheel 410 and the base plate 420. Therefore, when the coupling between the clutch wheel 410 and the base plate 420 is released by the plastic deformation of the slip spring 510, the rotational force from the motor 200 acts only on the clutch wheel 410, the base plate 420 The clutch wheel 410 is turned against. As a result, the rotational force of the motor 200 and the clutch wheel 410 is not transmitted to the base plate 420, and even if the lock bar 440 is locked to the ratchet 430, The rotational force is not transmitted to the take-up shaft 100, and the rod limiter 80 is smoothly operated. The slip spring 510 for releasing the overload as described above should be replaced by repair and replacement when an accident occurs due to a collision as a single use.

Hereinafter, a preferred embodiment of the seat belt 1 provided with the retractor 20 according to the present invention will be described with reference to FIG. 1, and the redundant description of the retractor 20 according to the present invention will be omitted. .

Seat belt 1 according to the present invention is coupled to the belt-shaped webbing 10 to secure the occupant, the retractor 20 is wound the webbing 10, and the drawn end of the webbing 10 Belt tongue 30 and a buckle 40 to which the belt tongue 30 is detachably inserted.

The webbing 10 prevents the occupant's body from tumbling forward or deviating from the seat due to driving inertia when the vehicle is suddenly stopped or overturned due to a collision accident, and the buckle 40 is a webbing 10. It is possible to fix the belt tongue (30) from which the pulled out to the vehicle body.

The retractor 20 is a device for winding the webbing 10. The retractor 20 allows the webbing 10 to be pulled out when the occupant wears the webbing 10, but has a large force on the webbing 10 due to a vehicle collision. When the hook is taken out abruptly, the drawing of the webbing 10 is suppressed, thereby preventing the occupant from leaning forward of the seat while wearing the webbing 10.

The retractor 20 of the seat belt 1 includes a winding shaft 100 in which a webbing 10 for restraining a passenger is retractable and a winding shaft 100 in a direction in which the webbing 10 is retracted. It is accommodated in the motor 200 for transmitting the rotational force to the 100, and the housing 300 provided at one end of the winding shaft 100, interposed between the motor 200 and the winding shaft 100, the motor ( And a clutch unit 400 for selectively transmitting the rotational force of the 200 to the winding shaft 100, wherein the clutch unit 400 is disposed coaxially with the winding shaft 100, and the motor 200. Ring-shaped clutch wheel 410 receives a rotational force from), the base plate 420 is coupled to the inner side of the clutch wheel 410 and rotates together, coaxially coupled to one end of the take-up shaft 100 The ratchet 430 is rotated together and rotatably coupled to one side of the base plate 420, one end of the ratchet 430 A lock bar 440 that is locked or released to the lock bar 430 and inserted into a rotation center of the lock bar 440, and a spring force is applied to one end of the lock bar 400 in a direction in which the lock bar 400 is released from the ratchet 430. Providing a torsion spring 450 and the rotation limit boss protruding on one side of the base plate 420 to limit the rotation distance in the direction in which the end of the lock bar 440 is released from the ratchet 430 ( 460, the clutch cover 470 coupled to the other side of the base plate 420, and the other side of the clutch cover 470 while sliding or pressing one end of the lock bar 440 Drive plate 480 provided with a slider 481.

In addition, the retractor 20 of the seat belt 1 has an annular guide ring which slides while the other side is engaged with one side of the drive plate 480 with the clutch cover 470 interposed therebetween ( 490 and one end is inserted into the outer circumferential groove of the guide ring 490 and the clutch cover 470 in a ring shape where the other end is not connected, one end is fixed to the inside of the housing 300, and the other end is the drive. It may further include a friction spring coupled to the plate 480 to provide a spring force as opposed to the rotation direction in which the drive plate 480 slides.

In addition, the retractor 20 of the seat belt 1 is forcibly sandwiched between an inner circumferential surface of the clutch wheel 410 and an outer circumferential surface of the base plate 420, and a lock bar 440 is attached to the ratchet 430. When the winding shaft 100 rotates in the direction in which the webbing 10 is drawn by the operation of the motor 200 in the locked state, when excessive rotation force occurs in the direction in which the webbing 10 is drawn out The plastic deformation may further include a plate-shaped slip spring 510 for releasing the coupling of the clutch wheel 410 and the base plate 420.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10: webbing
20: Retractor
30: belt tongue
40: buckle
100: winding shaft
200: motor
300: housing
400: clutch portion
410: Clutch Wheel
420: base plate
430: ratchet
440: rock bar
450: torsion spring
460: rotation limit boss
470: Clutch Cover
480: drive plate 481: slider
490: guide ring
500: Friction Spring
510: slip spring

Claims (6)

A webbing constraining the occupant to be pulled in and retractably wound; a motor for transmitting rotational force to the winding shaft in a direction in which the webbing is retracted; and a housing installed at one end of the winding shaft; A clutch portion interposed between the shafts and selectively transmitting the rotational force of the motor to the winding shaft,
The clutch unit,
An annular clutch wheel disposed coaxially with the winding shaft and receiving rotational force from the motor;
A base plate coupled to the inner side of the clutch wheel and rotating together;
A ratchet coupled to one end of the winding shaft coaxially and rotating together;
A lock bar rotatably coupled to one side of the base plate and having one end latched or released from the ratchet;
A torsion spring inserted into the rotation center of the lock bar and providing a spring force in a direction in which one end of the lock bar is released from the ratchet;
A rotation limit boss protruding from one side of the base plate to limit a rotation distance in a direction in which one end of the lock bar is released from the ratchet;
A clutch cover having the other side coupled to one side of the base plate;
And a drive plate provided with a slider for pushing or releasing one end of the lock bar while sliding on the other side of the clutch cover.
The method of claim 1,
An annular guide ring which slides together while the other side is engaged with one side of the drive plate with the clutch cover interposed therebetween;
One end and the other end is inserted into the outer circumferential groove of the guide ring and the clutch cover in an annular shape, one end is fixed to the inside of the housing, the other end is coupled to the drive plate and the rotation direction in which the drive plate slides and On the contrary, the retractor further comprises a friction spring providing a spring force.
The method of claim 1,
The webbing when the winding shaft is rotated in a direction in which the webbing is drawn by the operation of the motor while being locked between the inner circumferential surface of the clutch wheel and the outer circumferential surface of the base plate; Retractor, characterized in that it further comprises a plate-shaped slip spring for releasing the coupling of the clutch wheel and the base plate while plastic deformation when excessive rotational force occurs in the drawing direction.
On the seat belt comprising a belt-shaped webbing to secure the occupant, a retractor on which the webbing is wound, a belt tongue coupled to the drawn end of the webbing, and a buckle to which the belt tongue is detachably inserted. In
The retractor is accommodated in a winding shaft in which the webbing is retractably wound, a motor for transmitting rotational force to the winding shaft in a direction in which the webbing is retracted, and a housing installed at one end of the winding shaft. And a clutch interposed between a winding shaft and a transmission unit for selectively transmitting the rotational force of the motor to the winding shaft,
The clutch unit,
An annular clutch wheel disposed coaxially with the winding shaft and receiving rotational force from the motor;
A base plate coupled to the inner side of the clutch wheel and rotating together;
A ratchet coupled to one end of the winding shaft coaxially and rotating together;
A lock bar rotatably coupled to one side of the base plate and having one end latched or released from the ratchet;
A torsion spring inserted into the rotation center of the lock bar and providing a spring force in a direction in which one end of the lock bar is released from the ratchet;
A rotation limit boss protruding from one side of the base plate to limit a rotation distance in a direction in which one end of the lock bar is released from the ratchet;
A clutch cover having the other side coupled to one side of the base plate;
And a drive plate provided with a slider for pushing or releasing one end of the lock bar while sliding to the other side of the clutch cover.
5. The method of claim 4,
An annular guide ring which slides together while the other side is engaged with one side of the drive plate with the clutch cover interposed therebetween;
One end and the other end is inserted into the outer circumferential groove of the guide ring and the clutch cover in an annular shape, one end is fixed to the inside of the housing, the other end is coupled to the drive plate and the rotation direction in which the drive plate slides and On the contrary, the seat belt further comprises a friction spring providing a spring force.
5. The method of claim 4,
The webbing is pulled out when the winding shaft is rotated in the direction in which the webbing is drawn by the operation of the motor while the lock bar is engaged with the ratchet and the lock bar is engaged with the ratchet. Seat belt characterized in that it further comprises a plate-shaped slip spring to release the coupling of the clutch wheel and the base plate while plastic deformation when excessive rotational force occurs in the direction.

Images