Retractor including load compensation unit

Abstract

A retractor including a load correction unit according to the present invention is a retractor for reducing the deviation of the load transmitted to a passenger by the webbing in a retractor in which a pretensioner operates to fix a pilot wheel connected to one end of a spool on which the webbing is wound when an external impact occurs. The retractor may include a torsion bar unit that is mounted in a hollow portion formed in the center of the spool and transmits the load applied to the webbing, and a load correction unit coupled to rotate together with the spool, wherein when the load applied to the webbing exceeds a preset load, at least a portion of the spool and the torsion bar unit rotates relative to each other according to a preset number of rotations, and stops together with the spool and the torsion bar unit after the preset number of rotations has passed.

Description

Technology Field

[0001] The present invention relates to a retractor comprising a load compensation unit, and more specifically, to a retractor comprising a load compensation unit capable of ensuring safety from the load received by a seatbelt occupant from the seatbelt when a vehicle collides. Background Technology

[0002] Vehicles are equipped with various safety devices to prevent occupants from being ejected from the vehicle due to collisions with other vehicles or other objects.

[0003] A representative example among these is the seat belt, which securely fastens the occupant's lower abdomen and chest to the seat. However, collisions with other vehicles or objects often pose a risk to the occupant's safety due to the severity of the impact.

[0004] Therefore, various technologies are being developed to ensure that seat belts function properly even in the event of severe collisions between vehicles or with other objects. Among these, the retractor is currently receiving significant attention.

[0005] The retractor, which is currently receiving much attention, is a mechanism that prevents a passenger from being ejected from the vehicle by inertia by forcibly retracting the webbing surrounding the passenger when an external impact is applied.

[0006] However, since the load exerted on the occupant by the seat belt due to such retractors may potentially compromise occupant safety, active technological development regarding this is underway.

[0007] To this end, the developer has made structural improvements to reduce the load received from the seat belt in the retractor, and considers the safety of the occupant by driving the seat belt so that it is unwound to prevent the inertia of the occupant from being resisted when the seat belt is wound up, thereby preventing a high load from being applied.

[0008] However, the reality is that a problem arises where a significant load deviation occurs between high and low loads during such operation. The problem to be solved

[0009] The present invention is devised to solve the problems of the aforementioned prior art, and the purpose of the present invention is to provide a retractor including a load correction unit capable of safely protecting a occupant by controlling load deviation.

[0010] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0011] A retractor including a load correction unit of the present invention for achieving the above-mentioned purpose is a retractor for reducing the deviation of the load transmitted to a passenger by the webbing in a retractor in which a pretensioner operates to fix a pilot wheel connected to one end of a spool on which the webbing is wound when an external impact occurs. It may include a torsion bar unit that is mounted in a hollow portion formed in the center of the spool and transmits the load applied to the webbing, and a load correction unit coupled to rotate together with the spool, wherein when the load applied to the webbing exceeds a preset load, at least a portion of the spool and the torsion bar unit rotate relative to each other according to a preset number of rotations, and stop together with the spool and the torsion bar unit after the preset number of rotations has passed.

[0012] In addition, a portion of the load compensation unit is connected to the torsion bar unit, and when the spool rotates and exceeds the preset load, it can detach together with a portion of the torsion bar unit and rotate together with the spool.

[0013] Additionally, the load compensation unit may include a switch part that is formed to be able to engage with the torsion bar unit by penetrating the center and rotates together with the spool when a part of the torsion bar unit is fixed and is separated from the torsion bar unit by a predetermined amount, and a load form part that reduces the force of rotation of the spool when a part of the switch part is inserted into the torsion bar unit through the switch part and the switch part is separated from the torsion bar unit by a predetermined amount and rotates.

[0014] And the switch portion may include a rib member formed in a hook shape to protrude in a direction opposite to the direction toward the pilot wheel and to be coupled to the spool, and a locking member formed to protrude toward the torsion bar unit and to come into contact with a part of the torsion bar unit.

[0015] Additionally, the torsion bar unit may include a first gear member that is formed long and has gears formed at both ends, with one end connected to the spool and rotating together with the spool; a second gear member that has gears formed at both ends, with one end connected to the first gear member and the other end connected to the retractor, and is formed with a diameter relatively larger than that of the first gear member to be fixed by the retractor in the event of an external impact; and an adapter member that has a shape that wraps around the perimeter of the part where the first gear member and the second gear member meet, and includes a locking groove formed along a portion of the perimeter to come into contact with the locking member.

[0016] And the above-mentioned rod form part is formed to be partially bent and includes a bent end member inserted into the adapter member, and the bent end member can be detached from the adapter member in response to the rotation of the switch part while the adapter member is fixed.

[0017] In addition, the length at which the bending end member is inserted into the adapter member is set to the preset number of rotations, thereby adjusting the length of the bending end member to control the number of rotations at which the spool rotates. Effects of the invention

[0018] According to the present invention, by providing a load to the load falling from a high load to a low load, it is possible to reduce the standard deviation of the load due to the load difference.

[0019] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0020] FIG. 1 is a drawing showing a retractor including a load compensation unit according to an embodiment of the present invention including a spool; FIG. 2 is a combined perspective view of a spool, a torsion bar unit, and a load compensation unit in a retractor including a load compensation unit according to an embodiment of the present invention; FIG. 3 is a drawing for explaining the connection between a torsion bar unit and a load compensation unit in a retractor including a load compensation unit according to an embodiment of the present invention; FIG. 4 is a drawing for explaining that the load form portion, the switch portion, and the first gear member are detached from the adapter member and the second gear member in a retractor including a load compensation unit according to an embodiment of the present invention; FIG. 5 is a diagram illustrating the change in load applied to the webbing in a retractor including a load compensation unit according to an embodiment of the present invention. Specific details for implementing the invention

[0021] Preferred embodiments of the present invention, in which the objectives of the present invention can be specifically realized, will be described below with reference to the attached drawings. In describing these embodiments, the same names and reference numerals are used for identical components, and additional explanations thereof will be omitted.

[0022] The present invention relates to a retractor for stably transmitting the load transmitted to a passenger in consideration of passenger safety in a seatbelt operated by external impact, compared to conventional methods. It is a retractor (1) for reducing the deviation of the load applied to the passenger by the webbing in a retractor (1) in which a pretensioner operates to fix a pilot wheel (50) connected to one end of a spool (30) on which a webbing (not shown) is wound when an external impact occurs.

[0023] The configuration of the present invention mainly includes a torsion bar unit (100) and a load correction unit (200).

[0024] The torsion bar unit (100) is mounted in a hollow portion formed in the center of the spool (30) and can transmit a load to the webbing.

[0025] And the load compensation unit (200) is coupled to rotate together with the spool (30), and when the load applied to the webbing exceeds a preset load, at least a portion of the spool (30) and the torsion bar unit (100) rotate relative to each other according to a preset number of rotations, and can stop together with the spool (30) and the torsion bar unit (100) after passing the preset number of rotations.

[0026] The present invention will be described in detail through the drawings.

[0027] FIG. 1 is a drawing showing a retractor (1) including a load compensation unit (200) according to one embodiment of the present invention, including a spool (30).

[0028] The retractor (1) of the present invention generates internal pressure due to an external impact to retract the webbing to a certain level, and then allows the occupant to be seated in the airbag with a low load for the safety of the occupant. At this time, the purpose is to reduce the load variation to reduce the impact transmitted to the occupant due to changes in the load of the webbing.

[0029] The configuration of the present invention for this purpose will be explained in detail through Figure 2.

[0030] FIG. 2 is a combined perspective view of a spool (30), a torsion bar unit (100), and a load compensation unit (200) in a retractor (1) including a load compensation unit (200) according to one embodiment of the present invention.

[0031] A portion of the load compensation unit (200) is connected to the torsion bar unit (100), and when the spool (30) rotates and exceeds the preset load, it can be detached together with a portion of the torsion bar unit (100) and rotate together with the spool (30).

[0032] The detailed configuration of the load compensation unit (200) for this purpose may include a switch part (220) and a load form part (240).

[0033] The switch portion (220) is formed with a center that penetrates so as to be able to engage with the torsion bar unit (100), and when a part of the torsion bar unit (100) is fixed, it can be separated from the torsion bar unit (100) and rotate together with the spool (30).

[0034] And the rod form part (240) penetrates the switch part (220) and a part of it is inserted into the torsion bar unit (100), and when the switch part (220) is rotated after being separated from the torsion bar unit (100), the force of rotation of the spool (30) can be reduced.

[0035] To this end, the switch portion (220) may include a rib member (222) formed as a ring so as to protrude in a direction opposite to the direction toward the pilot wheel (50) and to be coupled to the spool (30), and a locking member (224) formed to protrude toward the torsion bar unit (100) and to come into contact with a part of the torsion bar unit (100).

[0036] The rib members (222) are formed in a predetermined length and are provided in a pair in a hook shape with their ends bent, and the ends of the pair of rib members may have hook shapes in different directions.

[0037] As described, one of the pair of rib members has a shape bent toward the top, and the other has a shape bent toward the bottom.

[0038] This may be to make the direction in which the rib member (222) is joined to the inside of the spool (30) different so that it is firmly joined to the spool (30).

[0039] Also, the rib member (222) is formed to be long so that it can move in a predetermined manner along the longitudinal direction of the torsion bar unit (100) from the spool (30). This will be described later.

[0040] Meanwhile, the locking member (224) is provided to be able to rotate in contact with a part of the torsion bar unit (100), and when an impact occurs from the outside, the torsion bar unit (100) is fixed and the locking member (224) is detached from the part of the torsion bar unit (100) so that relative rotation is possible.

[0041] A torsion bar unit (100) for explaining this may include a first gear member (120) that is formed long and rotates together with a spool (30) through gears formed at both ends, a second gear member (140) that has gears formed at both ends, is connected to the first gear member (120) at one end and connected to a retractor (1) at the other end, and is formed with a diameter relatively larger than that of the first gear member (120) so as to be fixed by the retractor (1) when an external impact occurs, and an adapter member (160) that is formed to wrap around the perimeter of the part where the first gear member (120) and the second gear member (140) meet, and includes a catch groove (162) formed to come into contact with a catch member (224) on a part along the perimeter.

[0042] Here, the first gear member (120) and the second gear member (140) have a long bar shape, and gears with a diameter larger than the bar may be formed at each end.

[0043] And the second gear member (140) may be formed with a relatively larger diameter and a shorter length than the first gear member (120). The reason for this will be explained in detail later through FIGS. 3 and FIGS. 4.

[0044] Meanwhile, the rod form portion (240) may be formed of a material having elasticity and has a semicircular shape along the switch portion (220) through which the center is penetrated, and contacts the switch portion (220), and the bent end member (242) may penetrate the switch portion (220) and be inserted into the adapter member (160).

[0045] Therefore, the first gear unit can rotate together with the load form part (240), the switch part (220), and the spool (30).

[0046] And when the bent end member (242) is inserted into the adapter member (160), the switch member (220) and the adapter member (160) come into contact with each other, so that power resulting from the rotation of the spool (30) can be transmitted to the second gear unit.

[0047] The operation of the present invention will be explained in detail through FIGS. 3 and FIGS. 4.

[0048] FIG. 3 is a drawing for explaining the connection between the torsion bar unit (100) and the load compensation unit (200) in a retractor (1) including a load compensation unit (200) according to an embodiment of the present invention, and FIG. 4 is a drawing for explaining the detachment of the load form part (240), the switch part (220), and the first gear member (120) from the adapter member (160) and the second gear member (140) in a retractor (1) including a load compensation unit (200) according to an embodiment of the present invention.

[0049] First, in FIG. 3, the locking member (224) of the switch part (220) and the locking groove (162) of the adapter member (160) come into contact, so that the second gear member (140) also rotates together with the rotation of the spool (30).

[0050] And the rod form portion (240) is in a state where the bent end member (242) penetrates the switch portion (220) and is inserted into the adapter member (160). The rod form portion (240) is formed in a semicircular shape along the circumference of the hollow of the switch portion (220), and a pair of ends can be inserted protruding toward the adapter member (160).

[0051] Accordingly, as the bent end member (242) elastically deforms in response to the rotation of the switch part (220), it can transmit a load to the rotation of the first gear member (120) and provide a force to support the twisting of the first gear member (120).

[0052] Fig. 4 explains in detail how the load form part (240) and the switch part (220) detach from the adapter member (160).

[0053] As shown in the illustration, the catch member (224) is detached from the catch groove (162), and the bent end member (242) can be seen to be bent.

[0054] First, it was explained that the rib member (222) of the switch part (220) can move in a predetermined manner along the longitudinal direction of the torsion bar unit (100) on the spool (30) as described above.

[0055] Accordingly, when an external shock occurs, the switch part (220) moves in a predetermined direction away from the second gear member (140) inside the spool (30) in accordance with the length of the rib member (222), and at this time, the locking member (224) is disengaged from the locking groove (162).

[0056] Then, the rotational force of the spool (30) is not transmitted to the adapter member (160) and the second gear member (140).

[0057] The switch portion (220) is continuously rotated by the spool (30), and at this time, the bent end member (242) is detached from the adapter member (160) and bent, thereby generating a load, which prevents the load of the webbing transmitted to the occupant from rapidly decreasing.

[0058] The change in load will be explained through Figure 5.

[0059] FIG. 5 is a drawing for explaining the change in load applied to the webbing in a retractor (1) including a load compensation unit (200) according to one embodiment of the present invention.

[0060] When an external impact, i.e., an accident, occurs, the webbing retracts to support the occupant. At this time, the load applied to the webbing may increase rapidly.

[0061] A load is transmitted to the webbing at a high load for a predetermined time, and the load is rapidly reduced as the switch part (220) is separated from the adapter member (160). At this time, the switch part (220) moves along the length and wire diameter of the bent end member (242) of the rod form part (240), and the load is applied to the rod form part (240) to increase the degree of rapid reduction of the load.

[0062] Looking at the graph, the red line is the load graph shown in the prior art, and the blue line is the load graph shown in the present invention.

[0063] First, it can be seen that the load deviation, where the load decreases compared to the conventional load in the section marked as 'load drop' after passing the high load range on the left, is narrow due to the load form part (240).

[0064] As explained in the structural principle above, as the end of the bent end member (242) detaches from the adapter member (160), the switch member (220) provides a load to the rotation, and the bent end member (242) undergoes elastic deformation due to the continuous rotational force. As the switch member (220) moves along the length and diameter directions of the bent end member (242) and a load is applied by the load form member (240), the amount of load reduction can be limited in the section where the webbing load transmitted to the occupant is reduced.

[0065] This provides a load against a sudden drop in load, thereby providing the effect of reducing shaking in the forward and backward directions caused by the load for the occupant.

[0066] As described above, preferred embodiments according to the present invention have been examined. It is obvious to those skilled in the art that, in addition to the embodiments described above, the present invention may be embodied in other specific forms without departing from its spirit or scope. Therefore, the embodiments described above should be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the description above but may be modified within the scope of the appended claims and their equivalents. Explanation of the symbols

[0067] Retractor: 1 Spool: 30 Pilot Wheel: 50 Torsion bar unit: 100 First gear member: 120 Second gear member: 140 Adapter missing: 160 Locking groove: 162 Load compensation unit: 200 Switch section: 220 Absence of ribs: 222 Locking part: 224 Road Form Section: 240 Bent end member: 242

Claims

Claim 1 A retractor for reducing the variation in load transmitted to a passenger by said webbing in a retractor in which a pretensioner operates to fix a pilot wheel connected to one end of a spool on which a webbing is wound when an external impact occurs, wherein the retractor is mounted in a hollow portion formed in the center of said spool and transmits the load applied to said webbing; and includes a load correction unit coupled to rotate together with the spool, wherein when the load applied to the webbing exceeds a preset load, at least a part of the spool and the torsion bar unit rotates relative to each other according to a preset number of rotations, and stops together with the spool and the torsion bar unit after the preset number of rotations is exceeded, wherein the load correction unit comprises a switch part having a part connected to the torsion bar unit, which rotates together with the spool while detaching together with a part of the torsion bar unit when the spool rotates and exceeds the preset load, and which is formed to be able to engage with the torsion bar unit by penetrating the center, and which rotates together with the spool while detaching from the torsion bar unit by a preset amount when a part of the torsion bar unit is fixed. The device includes a rod form that reduces the force of rotation of the spool when the switch unit is inserted into the torsion bar unit through the switch unit and rotates after being separated from the torsion bar unit by a predetermined amount; the switch unit includes a rib member formed in a hook shape to protrude in a direction opposite to the direction toward the pilot wheel and to be coupled to the spool; and a locking member formed to protrude toward the torsion bar unit and to come into contact with a part of the torsion bar unit; the torsion bar unit includes a first gear member formed elongated and having gears formed at both ends, with one end connected to the spool and rotating together with the spool; and a second gear member formed with gears at both ends, with one end connected to the first gear member and the other end connected to the retractor, and having a diameter relatively larger than that of the first gear member so as to be fixed by the retractor when an external impact occurs.and includes an adapter member having a shape that wraps around the perimeter of the portion where the first gear member and the second gear member meet, and includes a locking groove formed along a portion of the perimeter to come into contact with the locking member; the adapter member is provided such that the end of the rod form portion can be inserted therein and is fixed together with the second gear member when an external impact occurs; the rod form portion includes a bent end member formed to be partially bent and inserted into the adapter member; the bent end member detaches from the adapter member in response to the rotation of the switch portion while the adapter member is fixed, and the length at which the bent end member is inserted into the adapter member is set to the preset number of rotations to control the number of rotations of the spool by adjusting the length of the bent end member; and as the switch portion moves along the length and diameter of the bent end member and a load is applied at the rod form portion, the amount of load reduction in the section where the webbing load transmitted to the occupant is reduced A retractor comprising a load compensation unit characterized by being limited. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete

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