KR101165994B1 - Retractor and seat belt therewith - Google Patents

Abstract

The present invention relates to a retractor and a seat belt having the same, which are easily processed and assembled by dramatically reducing the number of parts of a clutch part that transmits the rotational force of the motor to a winding shaft on which webbing is wound. The clutch unit is disposed coaxially with the take-up shaft, the clutch wheel receives rotational force from the motor, a ratchet coupled to one end of the take-up shaft coaxially and rotates together, and one side of the clutch wheel. It is rotatably coupled via a return spring to the lock bar, the lock bar is latched or released to the ratchet, and the ring-shaped friction spring is inserted into the outer peripheral groove while sliding on the inner surface of the housing to receive a spring force, A drive plate protruding from the lock bar and pressing or releasing the lock bar, the drive plate being disposed on the other side of the clutch wheel; A base plate disposed between the clutch wheel and the drive plate, coupled to the other side of the clutch wheel, and having a guide hole radially penetrated so that the slider is inserted and guided, and the lock bar and the return spring on one side of the clutch wheel; It comprises a clutch cover for engaging so as not to be separated from.

Description

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

The present invention relates to a retractor equipped with a motor that operates to draw in webbing in accordance with a preventive safety and collision prediction situation. It relates to a retractor and a seat belt having the same, which is easy to process and assemble.

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 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 using a front monitoring device such as a distance sensor, and operates the motor when the distance to the vehicle or obstacle in front of the vehicle is less than a predetermined value. The winding shaft is rotated in the retraction direction of the webbing 10 by the rotation 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 a direction I in which the webbing 10 is retracted. And a clutch unit 22 interposed between the motor and the winding shaft 21 to selectively transmit the rotational force to the winding shaft 21 and selectively transmitting the rotational force of the motor to the winding 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 approaches the lock bar 22e and presses the lock bar 22e to release the latch 22d. Will be placed in a closed state. At this time, the rotor 22c is relatively moved relative to the slider 22f. The lock bar 22e is moved within the predetermined range with respect to the slider 22f, and the lock bar 22e is pressed by the slider 22f to return the spring. 22g) will be in the latch release state with the ratchet 22d against the spring force. 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 the lock bar 22e is spaced apart from the slider 22f, the slider 22f that has pressed the lock bar 22e no longer stops pushing, and the spring force of the return spring 22g is prevented. The lock bar 22e is caught by the ratchet 22d by this. 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.

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

As described above, the retractor according to the prior art is difficult to process and assemble due to the complicated configuration of the clutch portion, and the rotational force from the motor is transmitted to the take-up shaft through a complicated configuration. There is a problem.

An object of the present invention devised to solve the above problems is to reduce the number of parts of the clutch portion for transmitting the rotational force of the motor to the winding shaft wound webbing is easy to process and assembly, and to minimize the rotational force of the motor The present invention provides a retractor and a seat belt having the same, which can be transmitted to the winding shaft as a loss, as well as a firm coupling between the components.

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 an occupant is retractably wound and a motor for transmitting rotational force to the winding shaft in a direction in which the webbing is retracted; 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. A clutch wheel that is disposed and receives rotational force from the motor, a ratchet that is coaxially coupled to one end of the winding shaft and rotates together, rotatably coupled to one side of the clutch wheel via a return spring, and The lock bar is caught or released by the ratchet, and the ring-shaped friction spring is inserted into the outer circumferential groove while sliding on the inner surface of the housing. The slider is provided with a spring force, and a slider for pressing or releasing the lock bar is protruded on one side thereof, and is disposed between the drive plate disposed on the other side of the clutch wheel and the clutch wheel and the drive plate. The base plate is coupled to the other side, the guide plate is radially penetrated so that the slider is inserted and guided, and a clutch cover for coupling the lock bar and the return spring so as not to be separated from one side of the clutch wheel.

In addition, the return spring, 'c' shaped, one end is fixed to the clutch wheel, the other end is characterized in that to provide a spring force to the engaging piece of the lock bar while surrounding the rotation center of the lock bar.

In addition, the friction spring is characterized in that the extension tip is protruded from the periphery of the ring is fixed to the inside of the housing in a ring shape, one end and the other end is not connected.

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. A clutch wheel disposed coaxially and receiving a rotational force from the motor, and a ratchet coupled to one end of the winding shaft coaxially and rotating together; The lock bar is rotatably coupled to one side of the clutch wheel via a return spring, and the lock bar is engaged or released by the ratchet, and the ring-shaped friction spring is inserted into the outer circumferential groove while sliding on the inner surface of the housing. The slider is provided with a spring force, and a slider for pressing or releasing the lock bar is protruded on one side thereof, and is disposed between the drive plate disposed on the other side of the clutch wheel and the clutch wheel and the drive plate. The base plate is coupled to the other side, the guide plate is radially penetrated so that the slider is inserted and guided, and a clutch cover for coupling the lock bar and the return spring so as not to be separated from one side of the clutch wheel.

In addition, the return spring, 'c' shaped, one end is fixed to the clutch wheel, the other end is characterized in that to provide a spring force to the engaging piece of the lock bar while surrounding the rotation center of the lock bar.

In addition, the friction spring is characterized in that the extension tip is protruded from the periphery of the ring is fixed to the inside of the housing in a ring shape, one end and the other end is not connected.

The retractor according to the present invention and the seat belt provided with the same greatly reduce the number of parts of the clutch which transmits the rotational force of the motor to the winding shaft on which the webbing is wound, and are easily processed and assembled, and the rotational force of the motor is minimized. It can be delivered to the take-up shaft, of course, by making a solid coupling between the components can increase the productivity and reduce the manufacturing cost, it is possible to provide a high-quality clutch portion.

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;
FIG. 6 is a front view illustrating an internal coupling state in the embodiment of FIG. 5;
FIG. 7 is an exploded perspective view illustrating the clutch unit in the embodiment of FIG. 6;
8 is a cross-sectional view of the clutch unit seen from the line AA ′ of FIG. 6,
9 and 10 are front views illustrating an operation process 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 10, the webbing 10 is not separately illustrated on the winding shaft 100, but the webbing 10 will be described in the state in which the webbing 10 is wound around the winding shaft 100.

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 10, and the clutch unit 400. 7 includes a clutch wheel 410, a ratchet 420, a lock bar 430, a drive plate 440, a base plate 450, and a clutch cover 460.

First, referring to FIG. 5, the retractor 20 according to the present invention may be described in brief. The fixing frame 50 may include a fixed frame 50, an ELM 60, a pretensioner 70, and a load limiter 80. The fixing frame 50 has the respective components are mounted and coupled, the rear wall 51 is formed in the cross-section '' 'is fixed to the vehicle body, and the left side wall 52 through which the winding shaft 100 to be described later is installed ) And the right side wall 53.

The ELM 60 is coupled to the left wall 52 of the fixed frame 50. Although the internal configuration is not shown in the drawing, when the occupant wears the webbing 10, the drawing of the webbing 10 is performed. However, when the webbing 10 is pulled out suddenly due to a vehicle collision or the like, the drawing of the webbing 10 is suppressed, thereby preventing the occupant from leaning forward of the seat while wearing the webbing 10. do.

The pretensioner 70 is installed below the left wall 52 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. The piston acts as a function of pulling back the webbing 10 rapidly 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. The load limiter 80 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 center of the take-up shaft 100 for drawing out the webbing 10 is twisted.

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, the 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 10, the webbing (10) restraining 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 wall 52 and the right wall 53 of the fixed frame 50. The winding shaft 100 is composed of a cylindrical body 110 in which the webbing 10 is wound, and a shaft 120 integrally protruding coaxially on both sides of the body 110.

The motor 200 transmits rotational force to the winding shaft 100 in the direction I in which the webbing 10 is drawn in, as shown in FIGS. 5, 6, and 10. 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 illustrated in FIGS. 6 to 10, the clutch unit 400 is accommodated in a housing 300 installed at one end of the winding shaft 100, and 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 protects the clutch unit 400 from the outside as shown in FIG. 6, and serves to mount and receive the clutch unit 400 together with the motor 200 and the gear unit 210. Detailed configuration of the clutch unit 400 as described above is shown in Figure 7 clutch wheel 410, ratchet 420, lock bar 430, drive plate 440, the base plate 450 and the clutch cover ( 460).

As illustrated in FIGS. 6 to 10, 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 ratchet 420 is for finally transmitting the rotational force of the motor 200 to the take-up shaft 100, and is coupled coaxially to one end of the take-up shaft 100 to rotate together. Although not an important part in the present invention, an overload release part 421 may be provided between the ratchet 420 and the winding shaft 100. The overload release unit 421 is overloaded with overloads generated by the webbing pull-out direction by the load limiter 80 and the webbing pull-in direction I by driving the motor 200 when an accident occurs due to a vehicle collision. To release the load, to release the coupling between the ratchet 420 and the winding shaft 100 to idle the ratchet 420 and the winding shaft 100. As illustrated in FIG. 7, the overload release part 421 may be a protrusion 421a and an insertion groove 421b which are broken when a shear force is generated at a break point greater than a break point due to an overload.

The lock bar 430 is for transmitting the rotational force of the clutch wheel 410 to the ratchet 420, is rotatably coupled to one side of the clutch wheel 410 via a return spring 431, the ratchet 420 is jammed or released. As shown in FIG. 9, the lock bar 430 is normally in a state of being released from the ratchet 420. In this case, the rotation force is lost through the lock bar 430 from the motor 200 via the clutch wheel 410. ) Is not transmitted, and of course, the motor 200 does not rotate. However, as shown in FIG. 10, the clutch wheel 410 and the lock bar 430 rotate together with the rotation of the motor 200, and the lock bar 430 is moved by the slider 443 of the drive plate 440 which will be described later. The lock bar 430 is locked to the ratchet 420 when the spring spring of the return spring 431 is pressed while being pressed. At this time, the rotational force is transmitted to the ratchet 420 through the lock bar 430 from the motor 200 via the clutch wheel 410. The return spring 431 has a 'c' shape, one end of which is fixed to the clutch wheel 410, and the other end of the return spring 431 to the engaging piece 432 of the lock bar 430 while surrounding the rotation center of the lock bar 430 It may be configured to provide a spring force. The locking piece 432 of the lock bar 430 is a part that is caught or released by the ratchet 420 and is pressed or released by the slider 443 of the drive plate 440 to be described later. The return spring 431 having the shape described above operates in conjunction with the operation of the slider 443 and the friction spring 442 of the drive plate 440, which will be described later, and is engaged with the ratchet 420 of the lock bar 430. The release speed can be increased quickly.

The drive plate 440 controls the operation of the lock bar 430 to selectively transmit the rotational force of the clutch wheel 410 to the ratchet 420. As shown in FIGS. 7 to 10, the drive plate 440 slides on the inner surface of the housing 300 and is provided with a spring force by inserting an annular friction spring 442 into the outer circumferential groove 441. Slider 443 for pressing or releasing the lock bar 430 protrudes on one side, and is disposed on the other side of the clutch wheel 410. The drive plate 440 is disposed on the other side of the clutch wheel 410 to slide in contact with the inner surface of the housing 300. In this case, the friction spring 442 is inserted into the outer circumferential groove of the drive plate 440 in an annular shape where one end and the other end are not connected, and an extension tip 442a having both ends protruding from the circumference of the ring is the housing ( It is fixed to the inside of (300). Accordingly, the drive plate 440 is provided with the spring force of the friction spring 442 fixed to the housing 300 and rotates while sliding in the housing 330. The slider 443 protruding from one side of the drive plate 440 rotates together with the drive plate 440, thereby pressing or releasing the lock bar 430.

The base plate 450 guides the slider 443 of the drive plate 440 to be easily assembled at a position where the lock bar 430 can be pressed and released. That is, the base plate 450 is disposed between the clutch wheel 410 and the drive plate 440, as shown in FIGS. 7 to 10, coupled to the other side of the clutch wheel 410, and the slider 443. ) Is inserted into the guide hole 451 is radially penetrated. Accordingly, the base plate 450 connects the clutch wheel 410 and the drive plate 440, and guides the slider 443 to press and release the lock bar 430.

As illustrated in FIGS. 7 and 8, the clutch cover 460 is firmly coupled to one side of the clutch wheel 410 by a lock spring 430 and a return spring 441 providing a spring force to the lock bar 430. It is to avoid. The clutch cover 460 is coupled to one side of the clutch wheel 410 and surrounds the lock bar 430 and the return spring 441 so as not to interfere with the operation.

The operation of the retractor 20 of the present invention configured as described above will be described in detail with reference to FIGS. 6, 7, 9 and 10.

As shown in FIGS. 6 and 7, 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 420 via the lock bar 430 rotating together with the clutch wheel 410 as shown in FIG. 10 to rotate the ratchet 420. Since the ratchet 420 is coaxially coupled with the take-up shaft 100, the rotation of the ratchet 420 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 lock bar 430, and the ratchet 420.

As shown in FIG. 9, since the clutch unit 400 is provided to selectively transmit the rotational force of the motor 200 to the winding shaft 100, the motor 200 does not always rotate. Likewise, the lock bar 430 and the ratchet 420 are 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 FIG. 10, 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. 9 and 10, when the motor 200 rotates, the clutch wheel 410 rotates through the gear unit 210. The lock bar 430 rotates together with the rotation of the clutch wheel 410, and the locking piece 432 of the lock bar 430 is pressed while moving below the slider 443. At this time, the slider 443 is also guided along the guide hole 451 and the drive plate 440 rotates together with the slider 443. The rotation of the drive plate 440 is made to receive the spring force of the friction spring 442, the spring force of the friction spring 442 is released by pressing the lock bar 430 of the slider 443 It works in the process.

When the locking piece 432 of the lock bar 430 is pressed while moving below the slider 443, the lock bar 430 is caught by the ratchet 420. Therefore, the rotational force of the clutch wheel 410 is transmitted to the ratchet 420 caught by the lock bar 430, and the winding shaft 100 rotates with the rotation of the ratchet 420.

On the other hand, the motor 200 stops the rotation when the collision prediction situation is deviated, and will be switched from the state of FIG. 10 to the state of FIG. 9. At this time, when the rotational force is no longer transmitted from the motor 200 to the clutch wheel 410, the drive plate 440 by the spring force of the friction spring 442 is returned to the rotation by the provided spring force. The slider 443 also rotates with the drive plate 440 to release the force to press the lock bar 430, and the spring force of the return spring 431 acts to lift the lock bar 430. Accordingly, the lock bar 430 and the ratchet 420 are in a released state as in the state of FIG. 9.

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 transmits rotational force to the take-up shaft 100 in the direction (I) in which the webbing 10 is wound to be retractable and the webbing 10 is retracted. Housed in a housing 300 installed at one end of the winding shaft 100 and the motor 200, and interposed between the motor 200 and the winding shaft 100 to measure the rotational force of the motor 200. And a clutch unit 400 selectively transmitting to the take-up shaft 100, wherein the clutch unit 400 is disposed coaxially with the take-up shaft 100 and receives rotational force from the motor 200. A clutch wheel 410, a ratchet 420 coupled coaxially to one end of the winding shaft 100 and rotated together, and rotates via a return spring 431 on one side of the clutch wheel 410 The lock bar 430 coupled to the ratchet 420, and coupled to the outer peripheral groove 441 while sliding to the inner surface of the housing 300. A type friction spring 442 is inserted to receive a spring force, and a slider 443 for pressing or releasing the lock bar 430 is protruded on one side thereof, and is provided on the other side of the clutch wheel 410. A guide hole disposed between the drive plate 440 disposed between the clutch wheel 410 and the drive plate 440, coupled to the other side of the clutch wheel 410, and the slider 443 is inserted and guided. 451 is radially penetrating through the base plate 450 and a clutch cover 460 for coupling the lock bar 430 and the return spring 431 so as not to be separated from one end surface of the clutch wheel 410 Is done.

At this time, the return spring 431 has a 'c' shape, one end of which is fixed to the clutch wheel 410, the other end of the locking bar 430 of the locking bar 430 while surrounding the rotation center of the lock bar 430 ) And the friction spring 442 has an annular shape in which one end and the other end are not connected, and an extension tip 442a having both ends protruding from the circumference of the ring is provided inside the housing 300. Can be fixed.

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: ratchet
430: rock bar
431: return spring 432: hook
440: drive plate 441: outer groove
442: friction spring 442a: extension tip
443: slider
450: base plate 451: guide hole
460: Clutch Cover

Claims (6)

Winding shaft wound the webbing which restrains a passenger to draw in and out,
A motor for transmitting rotational force to the winding shaft in a direction in which the webbing is retracted;
A clutch unit accommodated in a housing provided at one end of the winding shaft, interposed between the motor and the winding shaft to selectively transmit rotational force of the motor to the winding shaft,
The clutch unit,
A clutch wheel disposed coaxially with the winding shaft and receiving rotational force from the motor;
A ratchet coupled to one end of the winding shaft coaxially and rotating together;
A lock bar rotatably coupled to one side of the clutch wheel via a return spring, and locked or released by the ratchet;
A sliding ring spring is inserted into the outer circumferential groove while the inner surface of the housing slides to receive a spring force, and a slider for pressing or releasing the lock bar is protruded on one side thereof, and is provided on the other side of the clutch wheel. A drive plate disposed,
A base plate disposed between the clutch wheel and the drive plate, coupled to the other side of the clutch wheel, and having a guide hole radially penetrated so that the slider is inserted and guided;
And a clutch cover configured to couple the lock bar and the return spring so as not to be separated from one side of the clutch wheel.
The method of claim 1,
The return spring is,
Retractor characterized in that the end of the 'c' shape is fixed to the clutch wheel, the other end to provide a spring force to the locking piece of the lock bar while surrounding the rotation center of the lock bar.
The method of claim 1,
The friction spring,
Retractor, characterized in that the end is extended to the extension tip protruding from the periphery of the ring in the annular shape is not connected to the other end.
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,
A clutch wheel disposed coaxially with the winding shaft and receiving rotational force from the motor;
A ratchet coupled to one end of the winding shaft coaxially and rotating together;
A lock bar rotatably coupled to one side of the clutch wheel via a return spring, and locked or released by the ratchet;
A sliding ring spring is inserted into the outer circumferential groove while the inner surface of the housing slides to receive a spring force, and a slider for pressing or releasing the lock bar is protruded on one side thereof, and is provided on the other side of the clutch wheel. A drive plate disposed,
A base plate disposed between the clutch wheel and the drive plate, coupled to the other side of the clutch wheel, and having a guide hole radially penetrated so that the slider is inserted and guided;
Seat belt comprising a clutch cover for coupling the lock bar and the return spring so as not to be separated from one side of the clutch wheel.
The method of claim 4, wherein
The return spring is,
A seat belt having a 'c' shape, one end of which is fixed to the clutch wheel, and the other end of which surrounds the center of rotation of the rock bar and provides a spring force to the locking piece of the rock bar.
The method of claim 4, wherein
The friction spring,
Seat belts, characterized in that the extension tip is protruded from the periphery of the ring is fixed to the inner side of the housing in a ring shape, one end and the other end is not connected.

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