WO2018021795A1

WO2018021795A1 - Weight-switching load limiter

Info

Publication number: WO2018021795A1
Application number: PCT/KR2017/007990
Authority: WO
Inventors: 권순광
Original assignee: (유)삼송
Priority date: 2016-07-28
Filing date: 2017-07-25
Publication date: 2018-02-01
Also published as: KR20180012964A; KR101862161B1

Abstract

The purpose of the present invention is to provide a weight-switching load limiter that has a simplified structure and is easy to assembly such that manufacturing costs can be reduced. The present invention provides a weight-switching load limiter comprising: a cylindrical spool, one side of which is open, and the other side of which is closed; a torque tube rotatably installed on the inner periphery of the spool; a locking device installed on the open side of the spool; a first torsion bar, one end of which is connected to the locking device, and the other end of which is coupled to the torque tube; a second torsion bar, one end of which is coupled to the first torsion bar, and the other end of which is coupled to the closed surface of the spool; a toothed groove formed to range from the outer periphery of the spool to a part of the torque tube; a tooth inserted into the toothed groove such that movement of the torque tube is interlocked with movement of the spool; a switching ring coupled to the outer periphery of the spool, a sloping groove being provided on the inner periphery of the switching ring in the circumferential direction; a clutch ring coupled to the outer periphery of the spool, the clutch ring being stacked on and coupled to the switching ring in the axial direction, the clutch ring having a sloping protrusion inserted into a sloping groove, and the inner periphery of the clutch ring covering the tooth; and a driving device for rotating the switch ring, wherein, when the switch ring is rotated by the driving device, the clutch ring moves in the axial direction with regard to the switch ring and releases the interlocking between the torque tube and the spool by the tooth.

Description

Load switching load limiter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load limiter of a seat belt, and more particularly, to a load changeover load limiter capable of switching loads absorbed according to a passenger's body shape and weight.

The seat belt is a device that restrains a passenger in a vehicle. The seat belt is a device that protects the passenger by preventing the passenger from being separated from the seat in a similar situation such as a collision or a fall. However, because the upper body of the driver is moved forward by inertia when the vehicle is stopped suddenly due to a frontal collision, the seat belt is contrary to the original purpose of restraining the driver to the seat. There was a problem. This is because there is a gap between the upper body of the driver and the seat belt immediately after the collision and also between the upper body and the back of the seat.

Therefore, in the automobile industry, there is a need for a pretensioner (PRETENSIONER), which is a tensioning device that turns the spool in the reverse direction in a moment of need and winds the seat belt webbing around the spool to eliminate the gap. Thereafter, a load limiter (energy absorbing device) is needed to release the webbing wound on the spool gradually in the direction of the passenger's movement to limit the high load applied to the chest below a certain load.

1 is a view showing a load switching load limiter according to the prior art, which is a load switching load limiter disclosed in US Patent No. 6,616,081. A torque tube 18 is rotatably installed in the spool 12 and a portion of the torsion bar 13 is inserted into the rod tube 18. The torsion bar 13 has a first section 14 having a larger cross section and a second section 15 having a smaller cross section, with a first section 14 between the first section 14 and the second section 15. A connecting portion 16a is provided with a second connecting portion 16b at the right end of the second section 15. The first connecting portion 16a connects the torsion bar 13 and the spool 12 through the torque tube 18. And a second connection 16b directly connects the torsion bar 13 and the spool 12. A switching device for switching the load limiting device from the high load level to the low load level is achieved via the pole 21. The pawl 21 is coupled to the spool 12 and the torque tube 18. When the pawl 21 is in the engaged position, a load is applied to the spool 12 in the direction in which the belt 9 is released. At this time, a load flow occurs from the spool 12 through the torque tube 18 to the first section 14 of the torsion bar 13. Thus, the first section 14 is twisted and the load limiting is at a high level. Made up of If the pawl 21 disengages the torque tube 18 by actuation of the switching device, the spool 12 is capable of relative rotation with respect to the torque tube 18, and the flow of load is spool 12. And through the second connection 16b of the second section 15, so that the second section 15 is twisted and the load limiting is made at a low level.

2 and 3 are diagrams showing a switching device provided in the load switching load limiter according to the prior art. The switching device 26 for the axial movement of the spool ring 45 comprises a gunpowder 27 for impacting the piston 28, causing a linear movement of the piston 28. The linear movement of the piston 28 acts on the shoulder 29 projecting radially from the set collar 19 so that the set collar 29 is rotated. The axial movement of the set collar 19 moves the spool ring 45 and the movement of the spool ring 45 causes the pawl 21 to be released. The set collar 19 is supported relative to the cover 20 by an inclined lamp between the set collar 19 and the cover 20, the set collar 19 being pressed by the twisting of the cover 20, and thus Move in the axial direction.

The pawl 21, which affects the engagement of the spool 12 and the torque tube 18, bears against the recess 40 in the cross section of the spool 12 at the engagement position, pivoting about the center of rotation 22. , The spool 12 is wrapped around the outer circumference by the spool ring 45, the spool ring 45 extends to the recess of the spool 12, and the recess of the torque tube 18 through the support 24 ( The pawl 21 is held by the coupling nose 23 which meshes with 51.

The load switching load limiter according to the prior art requires the installation of a pole 21 which pivots about an axis in the spool 12 for switching, the pole 21 being a spool 12, a torque tube 18, a spool. There is a disadvantage that the assembly difficulty is high because of the complicated shape that must be supported by the support of the ring 45.

It is an object of the present invention to provide a load switching load limiter that can simplify assembly and reduce manufacturing costs.

The present invention is open on one side and closed on the other side of the cylindrical spool, the torque tube rotatably installed on the inner spool, the locking device is installed on the open side of the spool, the locking device and one end is connected, the torque tube and the other end is coupled The first torsion bar being coupled, one end coupled to the first torsion bar, and the other end being coupled to the closing surface of the spool, the second torsion bar being formed from the outer circumference of the spool to a part of the torque tube, and inserted into the tooth groove and torque Teeth for cooperating the movement of the spool of the tube, coupled to the outer circumference of the spool, switch ring having a circumferential inclined groove in the inner circumference, coupled to the outer circumference of the spool, laminated and coupled to the switch ring in the axial direction, inclined groove And a driving device for rotating the switch ring, the clutch ring having an inclined protrusion inserted into the inner circumference covering the teeth, and when the switch ring is rotated by the driving device, The latch ring moves axially with respect to the switch ring and provides a load changeover load limiter characterized in that the torque tube and spool are disengaged by the teeth.

In another embodiment of the present invention, the axial length of the tooth and the tooth groove is constant, it provides a load switching rod limiter, characterized in that shorter than the axial movement length of the clutch ring.

In another embodiment of the present invention, the spool has a guide groove extending in the axial direction, the clutch ring provides a load switching rod limiter characterized in that it has a guide protrusion inserted into the guide groove in the inner circumference.

In another embodiment of the present invention, the guide projection provides a load switching rod limiter, characterized in that formed integrally with the inclined projection.

In another embodiment of the present invention, the load limiting load limiter, characterized in that the rotation direction of the spool and the rotation direction of the switch ring when the load is limited.

In another embodiment of the present invention, the drive device includes an ignition trigger and a piston for advancing by the explosion of the ignition trigger, the load switching characterized in that the forward direction of the piston when the load is limited to the direction of rotation of the rotating body Provide a load limiter.

In another embodiment of the present invention, the spool provides a load switching rod limiter, characterized in that it comprises a winding portion on which the webbing is wound and a head portion located on the closing side and smaller in diameter than the winding portion.

The load switching load limiter of the present invention has a relatively simple structure and has an advantage of easy assembly.

1 is a view showing a load switching load limiter according to the prior art,

2 and 3 is a view showing a switching device provided in the load switching load limiter according to the prior art,

4 is a perspective view of a load switching load limiter according to an embodiment of the present invention;

5 is a view showing a switch ring provided in the load switching load limiter according to an embodiment of the present invention

6 is a view showing a clutch ring provided in a load switching load limiter according to an embodiment of the present invention;

7 is a view showing a state before the driving device load switching in the load switching load limiter according to an embodiment of the present invention,

8 is a cross-sectional view of the load switching load limiter according to an embodiment of the present invention before the drive device load switching;

9 is a view showing a state when the driving device load switching in the load switching load limiter according to an embodiment of the present invention,

10 is a cross-sectional view after the drive is load-switched in the load switching load limiter of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

4 is a view showing a perspective view of a load switching load limiter according to an embodiment of the present invention.

Load switching load limiter according to an embodiment of the present invention, one side 102 of the spool 100 is open and the other side 104 of the spool 100 is a closed cylindrical spool 100, spool 100 Torque tube 200 rotatably installed at an inner circumference, locking base L (see FIGS. 8 and 10) installed at one side 102 of spool 100, locking base L and first torsion bar ( One end 312 of the 310 is connected, the first torsion bar 310 and one end 322 to which the torque tube 200 and the other end 314 of the first torsion bar 310 are coupled, the first torsion bar ( 310 is coupled to the other end 324 of the second torsion bar 320 is coupled to the other side 104 of the spool 100 and one end 322 of the second torsion bar 320 is the first torsion bar. The second torsion bar 324 coupled to the other end 314 of the 310, the

tooth grooves

130 and 230 formed from the outer circumference of the spool 100 to a part of the torque tube 200, and the

tooth grooves

130 and 230 Teeth 410, the spool 100 is inserted into the spool 100 to interlock the movement of the spool 100 of the torque tube 200 Is coupled to the outer circumference of the switch, the switch ring 420 having a circumferential inclined groove on the inner circumference, coupled to the outer circumference of the spool 100, laminated and coupled to the switch ring 420 in the axial direction, And a

driving device

510, 520 for rotating the switch ring 420 and a clutch ring 430 having an inclined protrusion inserted therein, the inner circumference of which covers the teeth 410, and is driven by the

driving devices

510, 520. When the switch ring 420 is rotated, the clutch ring 430 moves axially with respect to the switch ring 420 and releases the interlock between the torque tube 200 and the spool 100 by the teeth 410. . The

driving devices

510 and 520 may be any type as long as they can generally rotate the switch ring 420. However, in one embodiment of the present invention, the ignition trigger 520 and the ignition trigger 520 may be exploded. Advance the piston 510 was adopted.

The spool 100 is cylindrical having a space provided therein, one side 102 is open, and the other side 104 is closed. The spool 100 includes a winding 110 on which the webbing of the seat belt is wound, and a head 120 located on the other side 104 on the outside of the closing surface and smaller than the winding 110. The head part 120 is formed with a tooth groove 130 for inserting the tooth 410 and a guide groove 140 for guiding the axial movement of the guide protrusion (not shown) of the clutch ring 430 to be described later. . Teeth groove 130 is formed perpendicular to the axis, the axial length, that is, the width is constant, the depth is shallower toward both ends. The width of the tooth groove 130 and the tooth 410 should be shorter than the distance that the clutch ring 430 moves when the switch ring 420 rotates. Meanwhile, although the groove 130 is named, the center of the tooth groove 130 formed in the spool 100 penetrates and is connected to the tooth groove 230 formed in the torque tube 200.

5 is a diagram illustrating a switch ring provided in a load switching load limiter according to an embodiment of the present invention. The switch ring 420 has a plurality of teeth 422 on the outer circumference thereof so as to be easily rotated by the piston 510. An inner circumference of the switch ring 420 has an inclined groove 424 formed to be inclined in the circumferential direction.

6 is a view showing a clutch ring provided in a load switching load limiter according to an embodiment of the present invention. As described above, the clutch ring 430 is stacked on the outer circumference of the spool 100 in the axial direction while maintaining contact with the switch ring 420 in a general situation. The clutch ring 430 protrudes downward on the inner circumference thereof and includes an inclined protrusion 432 inserted into the inclined groove 424 (see FIG. 5) of the switch ring 420 (see FIG. 5). In addition, the guide groove 434 is inserted into the guide groove 140 of the spool 110 and guides the clutch ring 430 to move only in the axial direction with respect to the spool 100. The guide protrusion protrudes into the inner circumference of the clutch ring 430. At this time, the inclined protrusion 432 and the guide protrusion 434 may be formed separately in different positions, but may be integrally formed in the same position in the angle, in this case there is an advantage that the structure can be further simplified.

4 to 6, when the switch ring 420 rotates by the piston 510, the position of the inclined groove 424 in contact with the end of the inclined protrusion 432 is also changed. Accordingly, the inclined protrusion 432 rises due to the axial path of the inclined groove 424 which is shorter, and thus the axial movement is performed in the direction away from the switch ring 420 as a whole of the clutch ring 430. Therefore, when the clutch ring 430 no longer surrounds the teeth 410, when the spool 100 rotates, the teeth 410 come out of the

teeth grooves

130 and 230 and the spool 100 and the torque tube ( 200) can not be connected. Therefore, only the spool 100 rotates and the torque tube 200 does not rotate together.

FIG. 7 is a view illustrating a state before a driving device converts load in a load switching load limiter according to an embodiment of the present invention.

Before the

drive devices

510, 520 are actuated, the piston 510 is not in contact with the switch ring 420, so that the switch ring 420 and the clutch ring 430 are spooled upon rotation of the spool 100. Rotate with 100).

At this time, when the clutch ring 430 is rotated together with the spool 100 and the switch ring 420, in order to prevent relative rotation and axial movement with the switch ring 420 due to unexpected vibration, etc. It is preferred to have a cover 440. The cover 440 engages the head 120 of the spool 100 and covers the guide protrusion 434 of the clutch ring 430 to prevent the clutch ring 430 from moving relative to the spool 100 in the axial direction. do.

8 is a cross-sectional view of the load switching load limiter according to an embodiment of the present invention before the driving device converts the load.

4 and 8, the clutch ring 430 is a tooth 410 because the switch ring 420 rotates together with the spool 100 as shown in FIG. 7 before the

drive device

510, 520 is operated. It covers the outside of and fixes it. Accordingly, the teeth 410 are inserted into the tooth grooves 130 and 230 (see FIG. 4) of the spool 100 and the torque tube 200 to interlock rotation so that the spool 100 and the torque tube 200 rotate together.

In a similar situation, such as a collision or a shock, the locking base L coupled to the open side of the spool 100 is locked to maintain a stationary state without rotation. Since the first end 312 of the first torsion bar 310 is coupled to the locking base L, the first end 312 of the first torsion bar 310 does not rotate and remains stationary. The second end 314 of the first torsion bar 310 is coupled to the torque tube 200 as described above. When the spool 100 rotates in the direction in which the webbing of the seat belt is drawn out, since the torque tube 200 rotates together with the spool 100 before the driving

devices

510 and 520 operate, the second end 314 is rotated. Will rotate. Accordingly, since the first end 312 of the first torsion bar 310 remains stationary and the second end 314 rotates together with the spool 100, the first torsion bar 310 is twisted so that the spool ( It is possible to absorb a part of the load applied to 100).

9 is a view showing a state when the driving device load switching in the load switching load limiter according to an embodiment of the present invention. When the piston 510 is advanced by the explosion of the ignition trigger 520, the piston 510 rotates the switch ring 420. At this time, the forward direction of the piston 510 is opposite to the rotation direction of the spool 100 when the webbing is pulled out of the spool 100. That is, when the ignition trigger 520 is exploded, the piston 510 moves in a direction opposite to the rotation direction while the switch ring 420 rotates together with the spool 100, and the switch ring 420 is moved to the spool 100. Since it is intended to rotate in the opposite direction, there is an advantage that the clutch release by the switch ring 420 is much easier.

10 is a cross-sectional view after load switching by the drive device in the load switching load limiter of the present invention.

After operation of the

drive devices

510, 520, the switch ring 420 rotates in the opposite direction to the spool 100, deforming the cover 440 covering the clutch ring 430 and the clutch ring 430 is the shaft. Direction and thus no longer covers the outside of the tooth 410. Thus, the tooth 410 exits from the tooth grooves 130, 230 (see FIG. 4) and the torque tube 200 does not rotate with the spool 100.

In a similar situation, such as a collision or a shock, the locking base L coupled to the open side of the spool 100 is locked to maintain a stationary state without rotation.

Since the first end 312 of the first torsion bar 310 is coupled to the locking base L, the first end 312 of the first torsion bar 310 does not rotate and remains stationary. The second end 314 of the first torsion bar 310 is coupled to the torque tube 200 as described above. When the spool 100 rotates in the direction in which the webbing of the seat belt is pulled out, since the linkage between the torque tube 200 and the spool 100 is released, the torque tube 200 is the first torsion bar 310. To stop with.

Since the first end 322 of the second torsion bar 320 is fixed to the second end 312 of the first torsion bar 310, the first torsion bar 320 is stationary. However, since the second end 324 of the second torsion bar 320 is fixed directly to the spool 100, the second end 324 of the second torsion bar 320 rotates with the spool 100. Twisted. As the second torsion bar 320 is twisted, a portion of the load applied to the spool 100 is absorbed.

The loads absorbed by the first torsion bar 310 and the second torsion bar 320 are different from each other, and detect a user's body shape to absorb the load by the first torsion bar 310 or drive

devices

510 and 520. May be switched to absorb the load by the second torsion bar 320.

Of course, the first torsion bar 310 may absorb a portion of the load, and may be switched to absorb the load in the second torsion bar 320 by operating the driving

devices

510 and 520 in the middle.

In the load switching load limiter provided by the present invention, the switch ring 420 and the clutch ring 430 having the inclined groove 424 and the inclined protrusion 432 are respectively installed directly on the spool 100 together with the spool 100. As the rotation direction of the switch ring 420 is opposite to the spool 100 by the piston 510 at the time of switching, the contact between the clutch ring 430 and the switch ring 420 is released to release the clutch. Accordingly, there is an advantage that the clutch mechanism can be released more stably.

Claims

A cylindrical spool open at one side and closed at the other;

A torque tube rotatably installed around the spool;

A locking device installed on the open side of the spool;

A first torsion bar having one end connected to the locking device and having a torque tube and the other end coupled thereto;

A second torsion bar having one end coupled to the first torsion bar and the other end coupled to the closed surface of the spool;

A tooth groove formed from an outer circumference of the spool to a part of the torque tube;

A tooth inserted into the tooth groove to engage movement of the spool of the torque tube;

A switch ring coupled directly to an outer circumference of the spool and having an inclined groove in a circumferential direction on an inner circumference thereof;

A clutch ring coupled directly to the outer circumference of the spool, stacked and coupled to the switch ring in an axial direction, and having an inclined protrusion inserted into the inclined groove, the inner ring covering the teeth; And

It includes a drive device for rotating the switch ring,

When the switch ring is rotated by the drive device, the clutch ring moves axially with respect to the switch ring and releases the torque tube and the spool from interlocking by the teeth.
The method of claim 1,

A load switching rod limiter characterized in that the axial length of the teeth and tooth grooves is constant and shorter than the axial movement length of the clutch ring.
The method of claim 1,

The spool has a guide groove extending in the axial direction, and the clutch ring has a guide protrusion inserted into the guide groove on the inner circumference thereof.
The method of claim 3,

The load turning rod limiter, characterized in that the guide projection is formed integrally with the inclined projection.
The method of claim 1,

Load limiting load limiter, characterized in that the rotation direction of the spool and the rotation direction of the switch ring is reversed when the load is limited.
The method of claim 1,

The drive device includes an ignition trigger and a piston moving forward by the explosion of the ignition trigger,

The load limiting load limiter, characterized in that the forward direction of the piston when the load is limited to the opposite direction of rotation of the rotor.
The method according to any one of claims 1 to 6,

The spool includes a winding portion on which the webbing is wound and a head portion located on the closing side and having a diameter smaller than that of the winding portion.