KR20170012788A - A Load Limiter and An Operating Method Thereof - Google Patents

A Load Limiter and An Operating Method Thereof Download PDF

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Publication number
KR20170012788A
KR20170012788A KR1020150104830A KR20150104830A KR20170012788A KR 20170012788 A KR20170012788 A KR 20170012788A KR 1020150104830 A KR1020150104830 A KR 1020150104830A KR 20150104830 A KR20150104830 A KR 20150104830A KR 20170012788 A KR20170012788 A KR 20170012788A
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KR
South Korea
Prior art keywords
piston
cylinder
fluid
retractor
spring
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Application number
KR1020150104830A
Other languages
Korean (ko)
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KR101706464B1 (en
Inventor
이도형
조성찬
김경엽
김인섭
임기택
조태현
Original Assignee
한양대학교 에리카산학협력단
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Priority to KR1020150104830A priority Critical patent/KR101706464B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/341—Belt retractors, e.g. reels comprising energy-absorbing means
    • B60R22/3413—Belt retractors, e.g. reels comprising energy-absorbing means operating between belt reel and retractor frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/282—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using fluids or vico-elastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/288—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices with means to adjust or regulate the amount of energy to be absorbed

Abstract

The present invention provides a load limiter. The load limiter comprises a piston, a spring and a cylinder. The piston has one end connected to a retractor and allows the length of a safety belt to be extended in case the retractor is operated in accordance with the generation of an external impact. The spring is connected to the other end of the piston to provide restoration force to the piston. The cylinder has a separation wall for restricting a movement route of the piston when the piston is moved in the direction of the retractor to allow the length of the safety belt to be extended. External impact is relieved by fluid flowing in the cylinder, and bucking of the spring is prevented by the separation wall such that it is easy to use the cylinder multiple times. As such, the load limiter has high performance and a long service period.

Description

[0001] The present invention relates to a load limiter and an operating method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load limiter and a method of operating the same, and more particularly, to a cylinder-type load limiter having improved recyclability and an operation method thereof.

Traffic accidents and accidents are increasing every year. Accordingly, the automobile industry is developing various protection system devices to protect the safety of passengers in case of unexpected accidents.

A load limiter, one of the protection systems for the safety of passengers, controls the length of the passenger's seatbelt with the retractor. More specifically, the load limiter loosens the seat belt that has been fastened by the retractor to a certain length, thereby preventing secondary lifting of the passenger caused by the retractor operation.

Conventional load limiting devices have been common to operate in conjunction with other safety devices, for example, an airbag and an electrical system.

For example, Korean Patent Application Publication No. 2004-0098388 (Application No. 10-2003-0030711, filed by Hyundai Mobis Co., Ltd.) discloses a sensor unit for detecting a collision and a distance, a control unit for outputting a belt control signal according to an output value of a sensor, Discloses a seat belt control apparatus and method that further includes a belt driving unit that controls a restraining force in a multistage manner in accordance with an output value so as to additionally control a restraining force of the seat belt by measuring a distance between the airbag and a passenger in real time when the airbag is deployed .

 However, there is a disadvantage that an electronic system combination such as the prior art can not respond immediately in the event of a system error, and may be used in conjunction with an airbag or other safety component, thereby resulting in additional cost for repair.

In order to overcome this disadvantage, in the present invention, by introducing a rod limiter using a cylinder, it is possible to quickly cope with an unexpected accident caused by a physical operation, and to perform an operation for separation from an airbag, To invent a load limiter device.

Korean Patent Publication No. 2004-0098388

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-performance rod limiter in which, when a piston reciprocates, an external impact is relieved by an orifice formed in a cylinder and an operation method thereof.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rod limiter with a long life that prevents the buckling of the spring by the partition and facilitates the reuse of the cylinder and an operation method thereof.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly efficient rod limiter applicable to hydraulic cylinders and pneumatic cylinders and a method of operating the same.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-efficiency rod limiter capable of being separated from an airbag and an operation method thereof.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above technical problems, the present invention provides a load limiter.

According to an embodiment of the present invention, the rod limiter may include a piston that is connected to a retractor at one end thereof and extends a length of the seat belt when the retractor operates according to an external shock, A spring connected to the other end of the piston for providing a restoring force to the piston and a piston for restricting the movement path of the piston when the piston moves toward the retractor so as to extend the length of the seat belt And a cylinder provided with a partition wall.

According to one embodiment, the spring of the load limiter is located between the closed end of the cylinder and the head of the piston, and can support the reciprocation of the piston.

According to one embodiment, the cylinder of the load limiter may be one of a hydraulic cylinder and a pneumatic cylinder.

According to one embodiment, the cylinder of the load limiter further includes an orifice communicating with a fluid pathway outside the cylinder, and a fluid flowing from the orifice to the fluid path is externally applied So as to absorb the shock.

According to one embodiment, the fluid of the load limiter is provided between the piston and the partition in the cylinder, and when the piston moves toward the retractor so as to extend the length of the seat belt, It is possible to absorb an external impact by moving the fluid path through the orifice.

According to one embodiment, the partition wall of the load limiter can prevent buckling of the spring by limiting the moving distance of the piston.

According to one embodiment, the load limiter further includes an L-shaped bracket, which connects the retractor and the cylinder, thereby transmitting an external shock transmitted from the retractor to the cylinder have.

According to one embodiment, the load limiter further includes a bearing, which can connect the base to the cylinder so that the cylinder rotates about the bearing.

In order to solve the above-mentioned technical problems, the present invention provides a method of operating a load limiter.

According to one embodiment, an operation method of the load limiter includes a moving step of moving the piston to increase the length of the seat belt when the retractor is operated by an external impact, a movement step of moving the piston by a partition wall, And a restoring step of restoring the piston by restoring force of a spring connected to the other end of the piston.

According to one embodiment, the method of operating the load limiter may include repeating the step of moving the piston and the step of restoring the piston by the spring.

According to an embodiment, in the method of operating the load limiter, the moving step may further include an impact mitigation step of mitigating an external shock while fluid located between the head of the piston and the partition wall passes through the orifice.

According to one embodiment, in the method of operating the load limiter, the shock mitigation step may include a step in which fluid having passed through the orifice flows into a space opposite to the head of the piston and the partition.

A load limiter according to an embodiment of the present invention includes a cylinder that is composed of a piston extending a length of a seat belt, a spring providing a restoring force to the piston, and a wall limiting a movement path of the piston cylinder, the outer impact is relieved by the orifice formed in the cylinder when the piston reciprocates, and a high-performance, long-life rod limiter that prevents the buckling of the spring by the partition wall facilitates cylinder re- Can be provided.

1 is a perspective view illustrating a seatbelt system according to an embodiment of the present invention.
2 is a view for explaining a configuration of a load limiter according to an embodiment of the present invention.
3 is a view for explaining a bearing of a load limiter according to an embodiment of the present invention.
4 is a flowchart illustrating a method of operating a load limiter according to an embodiment of the present invention.
5 to 9 are operation diagrams illustrating a method of operating a load limiter according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Also, while the terms first, second, third, etc. in the various embodiments of the present disclosure are used to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. Thus, what is referred to as a first component in any one embodiment may be referred to as a second component in another embodiment. Each embodiment described and exemplified herein also includes its complementary embodiment. Also, in this specification, 'and / or' are used to include at least one of the front and rear components.

The singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprises "or" having "are intended to specify the presence of stated features, integers, Should not be understood to exclude the presence or addition of one or more other elements, elements, or combinations thereof. Also, in this specification, the term "connection " is used to include both indirectly connecting and directly connecting a plurality of components.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a perspective view illustrating a seatbelt system according to an embodiment of the present invention. A seat belt system according to an embodiment of the present invention is a system for protecting passengers from an external shock applied to a vehicle. For example, the seat belt system includes a load limiter 100, a retractor 200, . ≪ / RTI >

The load limiter 100 and the retractor 200 adjust the length of the seat belt 210 to be worn by a passenger so that the passenger The impact applied can be mitigated.

The retractor 200 may perform a function of winding the seat belt 210. That is, the retractor 200 reduces the length of the seat belt 210 that the passenger wears, so that the seat belt 210 fits into the body of the passenger so that the passenger is brought into close contact with the seat 300 . Also, the retractor 200 may perform a locking function of the seat belt 210 to prevent the seat belt 210 from being externally extended. As a result, it is possible to prevent the passenger from being thrown out of the vehicle body by the external impact.

The load limiter 100 may release the length of the seat belt 210. Specifically, the load limiter 100 can protect the passenger from an external shock by increasing the length of the seat belt 210 worn by a passenger.

According to one embodiment, the load limiter 100 may operate following the retractor 200, or alternatively, the load limiter 100 may operate prior to the operation of the retractor 200. In general, the length of the seat belt 210 is fixed when an external impact is applied to the retractor 200. The secondary seat belt 210 may be lifted up by the fixed seat belt 210. At this time, the rod limiter 100 increases the length of the seat belt 210 by a predetermined length before and / or after the operation of the retractor 200 so that a secondary injury by the seat belt 210 Can be minimized.

The L-shaped bracket 170 may be connected to the load limiter 100 and the retractor 200. Specifically, one end of the L-shaped bracket 170 is connected to the load limiter 100, and the other end of the L-shaped bracket 170 is connected to the retractor 200. Accordingly, the L-shaped bracket 170 can transmit the vertical load of the retractor 200 to the load limiter 100.

According to one embodiment, at least one of the load limiter 100, the retractor 200, and the L-shaped bracket 170 may be fixed to the fixing table 310. The fixing table 310 may refer to an inner wall of a vehicle body formed in a peripheral space of the seat 300.

According to the seat belt system according to the embodiment of the present invention described with reference to FIG. 1, when an external shock occurs, the load limiter increases the seat belt by a predetermined length, thereby minimizing the injury of the passenger.

2 is a view for explaining a configuration of a load limiter according to an embodiment of the present invention.

Referring to FIG. 2, the load limiter 100 may include a cylinder 110, a piston 120, a spring 130, and a fluid 150.

The cylinder 110 may include an inner cylinder 112 in a hollow region of the cylinder 110. The inner cylinder 112 may include the piston 120, the spring 130, and the fluid 150.

The inner cylinder 112 may provide a movement path to the piston 120, which will be described later. For example, the piston 120 may reciprocate within the inner cylinder 112.

The inner cylinder 112 may be divided into a pneumatic cylinder and a hydraulic cylinder depending on the type of the fluid 150. Specifically, when the fluid 150 is air, the cylinder 110 corresponds to a pneumatic cylinder, and when the fluid 150 is oil, the cylinder 110 may be a hydraulic cylinder.

The piston 120 may include a piston head 125 and a piston rod 128. The diameter of the piston head 125 may be wider than the diameter of the piston rod 128.

According to one embodiment, one end of the piston 120 in which the piston head 125 is located may be connected to the spring 130. The other end of the piston 120 in which the piston rod 128 is located may be connected to the L-shaped bracket 170.

As described above, the piston 120 may perform a reciprocating motion in the cylinder 110. The reciprocating motion of the piston 120 may be generated by the operation of the spring 130 and the retractor 200. More specifically, the piston 120 can receive a force in the y-axis direction by the retractor 200, and can reciprocate by receiving a force in the -y axis direction by the spring 130.

When the piston 120 reciprocates, the partition wall 140 may limit the clearance? Of the piston 120. [ The partition wall 140 can prevent the buckling of the spring 130, which will be described later, by limiting the clearance? Of the piston 120. Accordingly, a plurality of reciprocating movements of the piston 120 may be possible. In other words, it is possible to use the load limiter 100 plural times.

The partition wall 140 is located inside the cylinder 110 and may be fixedly provided at the open end 117 of the cylinder 110. Also, the partition wall 140 has a ring shape, thereby providing space for the piston rod 128 to reciprocate within the ring.

The diameter of the piston rod 128 and the diameter of the through-hole of the partition wall 140 may be the same. Accordingly, when the piston 120 moves in the direction of the retractor 200, the piston rod 128 can move through the partition 140.

The spring 130 may be connected to one end and the other end of the piston 120 and the closed end 115 of the cylinder 110, as described above.

As described above, the spring 130 can support the reciprocating motion of the piston 120 by the restoring force.

Continuing with reference to FIG. 2, the fluid 150 may be air or oil.

The fluid (150) may be provided in the cylinder (110) and may flow according to the position of the piston (120). More specifically, the fluid 150 may move from the A space formed in the inner cylinder 112 to the orifice 160. The fluid 150 moved to the orifice 160 may then flow back into the inner cylinder 112 along the fluid path 165.

The orifice 160 may be located on the inner wall of the inner cylinder 112. Referring to FIG. 2, one end and the other end of the orifice 160 may connect the inner cylinder 112 and the fluid path 165.

At this time, the position and the number of the orifices 160 shown in FIG. 2 are merely examples, and can be changed according to design specifications. 2, the orifice 160 is positioned in the -x direction with respect to the piston 120. However, when the orifice 160 is positioned in the + x direction with respect to the piston 120, Of course.

The orifice 160 may provide a path of movement for the fluid 150. The fluid 150 may pass through the orifice 160 to mitigate external impact. More specifically, when the piston 120 moves in the direction of the retractor 200, the volume of the space A shown in FIG. 2 can be reduced. That is, the space between the partition wall 140 and the piston head 125 is narrowed. Accordingly, the fluid 150 provided in the space A may flow out of the space A through the orifice 160 located on the inner wall of the inner cylinder 112. At this time, since the fluid 150 is temporarily introduced into the orifice 160 in a large amount, frictional heat may be generated to a high degree. Therefore, the external impact can be alleviated by the frictional heat. The fluid 150 moved to the orifice 160 may then flow into the inner cylinder 112 through the fluid path 165. The fluid 150 may circulate through the path described above according to the reciprocating movement of the piston 120.

The bearing 180 may be located at the closed end 115 of the cylinder 110. The bearing 180 will be described later in detail with reference to FIG.

3 is a view for explaining a bearing of a load limiter according to an embodiment of the present invention.

Referring to FIG. 3, the bearing 180 may be positioned on the bottom surface of the load limiter 100. More specifically, the bearing 180 may be located on the bottom surface of the cylinder 110 where the closed end 115 of the cylinder 110 is located. Accordingly, the bearing 180 can connect the load limiter 100 to the base.

As shown in FIG. 3, the load limiter 100 may rotate about the axis of the bearing 180. Accordingly, the load limiter 100 can actively operate regardless of the direction of the external impact applied from the retractor 200. [

2 and 3, the structure and the role of the load limiter 100 according to the embodiment of the present invention have been described above.

Hereinafter, a method of operating the load limiter 100 will be described in detail with reference to FIGS. 4 to 9. FIG.

FIG. 4 is a flowchart illustrating a method of operating a load limiter according to an embodiment of the present invention, and FIGS. 5 to 9 are operation diagrams illustrating a method of operating a load limiter according to an embodiment of the present invention.

A method of operating a load limiter according to an embodiment of the present invention includes an initial step S110 of a load limiter to which a seat belt is connected at one end, a moving step S120 of moving a piston by an external impact transmitted through the seat belt, (S140) in which the movement of the piston is blocked by the partition wall, and a restoring step (S140) in which the piston is restored by the restoring force of the spring connected to the other end of the piston. Hereinafter, each step will be described in detail.

Referring to FIG. 4, step S110 is an initial step of the load limiter 100 to which the seat belt 210 is connected at one end. 5, the load limiter 100 may include a spring 130 between the piston head 125 and the closed end 115 of the cylinder 110. [

In the initial stage of S110, the spring 130 may be in an initial state that is not subjected to a tensile force or a compressive force. Accordingly, the piston 120 connected to one end of the spring 130 may be in an initial state. As shown in FIG. 5, the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 is defined as h 0 . That is, h 0 may correspond to the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 when the spring 130 is in an initial state.

When the piston 120 is in an initial state, a space A may be formed between the piston head 125 and the partition 140. The height of the A space may be? 0 .

Referring to FIG. 4 again, step S120 is a moving step in which the piston 120 is moved by an external impact transmitted through the seatbelt 210. Referring to FIG.

Referring to FIG. 6, the piston 120 can be moved in the direction of (1) to which the L-shaped bracket 170 is connected by an external impact. At this time, when the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 is equal to h 0 , while the piston head 125 moves in the direction of? 1 by the movement of the piston 120, Lt; RTI ID = 0.0 > h0 + alpha 1 < / RTI > Accordingly, the length of the seat belt 210 connected to the L-shaped bracket 170 can be extended by? 1 . Therefore, secondary lifting from the retractor 200 can be reduced.

The space A formed between the piston head 125 and the partition wall 140 by the movement of the piston 120 can be reduced to A '. That is, at the height of the α 0 0 α A space - can be reduced to α 1.

On the other hand, the spring 130 connected to the cylinder head 125 and the closed end 115 may be stretched. In other words, the B space in the inner cylinder 112 where the spring 130 is located can be widened.

Referring to FIG. 6 Z, the A 'space and the B' space may include the fluid 150. 2, the fluid 150 flows from the A 'space to the B' space through the orifice 160 located on the inner wall of the inner cylinder 112 and the orifice 160 located on the inner wall of the inner cylinder 112 in accordance with the reciprocating motion of the piston 120, And may be moved through the fluid path 165 located on the inner wall of the cylinder 110. In other words, the fluid 150 can circulate through the path described above in accordance with the reciprocating movement of the piston 120. The movement path of the fluid 150 will be described in more detail with reference to FIG.

FIG. 7 is a view for explaining a flow path of a fluid in a load limiter according to an embodiment of the present invention, and FIG. 7 is an enlarged view of a Z region in FIG.

Referring to FIG. 7, the fluid 150 may be located in the A 'and B' regions, as described above in FIG.

The path of the fluid 150 is a first movement (1) in the A 'region through the orifice A (160A) to the fluid path (165), the orifice B 160B, and a third movement (3) that moves from the orifice B 160B to the B 'region.

The fluid 150 can circulate the path and mitigate the external impact applied to the load limiter 100.

6 and 7, when the piston 120 moves in the direction of the L-shaped bracket 170, the A 'region located between the piston head 125 and the partition wall 140, Can be reduced. Accordingly, when the fluid 150 moves in the first movement (1), the flow rate of the fluid 150 increases. In other words, the fluid 150 may first move into the orifice 160, which is in communication with the A 'region at a faster speed than when the piston 120 is in an initial state (h 0 ) . At this time, a large amount of the fluid 150 may enter the defined diameter of the orifice 160, resulting in frictional forces at the surface of the orifice 160. The fluid 150 moves to the fluid path 165 a second time (②), and the heat generated due to the frictional force can be dissipated to the outside. At this time, the external impact energy may be exhausted by some frictional heat. Therefore, the load limiter 100 can mitigate the external impact caused by the movement of the piston 120 in the cylinder 110.

The fluid 150 passing through the fluid path 165 may be moved (3) through the orifice 160 located in the B 'region. In other words, the fluid 150 may flow back into the inner cylinder 112 through the orifice 160 and the fluid path 165.

The movement path of the fluid 150 may be circulated by the reciprocating movement of the piston 120 as described above. For example, when the piston 120 moves in the direction in which the L-shaped bracket 170 is connected, the fluid 150 can move repeatedly through the circulation path described above.

Referring again to FIG. 4, in step S130, the movement of the piston 120 is blocked by the barrier 140.

Referring to FIG. 8, when an external impact is applied, the piston 120 of the load limiter 100 can move in the direction (2) to which the L-shaped bracket 170 is connected. At this time, the piston head 125 can move in the direction 2 by the magnitude of? 2 (? 2 >? 1 ).

the size of α 2 may be the same as the clearance distance α 0 between the piston 120 and the partition 140 in the initial state S110. More specifically, when the piston 120 moves in the direction 2, as described above with reference to FIG. 2, the piston head 125 is caught in the partition wall 140 so that the clearance distance 2 Lt; / RTI > Accordingly, buckling of the spring 130 connected to the other end of the piston head 125 can be prevented. That is, the barrier rib 140 may provide a movement path for reciprocating the spring 130 within an elastic range.

When the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 is smaller than the initial distance h 0 in the case where the magnitude of α 2 is equal to the clearance distance α 0 of the piston 120 as described above, in can be prolonged by h 0 + α 2. Accordingly, the length of the seat belt 210 connected to the L-shaped bracket 170 can be extended by a maximum of? 2 .

In addition, the spring 130 connected to the piston head 125 and the closed end 115 may be extended. In other words, the space in the inner cylinder 112 where the spring 130 is located can be widened from B 'to B''. As described above, when the gap 120 between the piston 120 and the partition 140 when the size of? 2 is the initial state S110 is equal to the clearance distance? 0 , the B " The volume of A shown in Fig.

Referring again to FIG. 4, step S140 is a restoration step in which the piston 120 is restored by the restoring force of the spring 130 connected to the other end of the piston 120. [0064] FIG.

Referring to FIG. 9, the piston 120 of the load limiter 100 can be moved in a direction (3) by the restoring force of the spring 130. At this time, as the piston head 125 moves in the direction of? 3 by the movement of the piston 120, the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 becomes h in the state of 0 + α 2 (see Fig. 8) - α can be shortened as much as three. when? 3 is equal to? 0 , the distance between the upper end of the cylinder 110 and the L-shaped bracket 170 can be returned to the initial state h 0 .

Further, by the restoring force of the spring 130, The volume B '' 'in the inner cylinder 112 may be reduced from B' '. If restoring to the initial state, B '' 'may be the same volume as B in the initial state.

On the other hand, the A "space (see FIG. 8) formed between the piston head 125 and the partition 140 can be expanded to A '' '. If restoring to the initial state, A '' 'may be the same volume as the initial state A.

According to one embodiment, in step S140, the fluid 150 provided in the B '' 'space flows from the B' '' area to the fluid path 165, from the fluid path 165 to the orifice 160, '' From the orifice 160 to the A '' 'region. In other words, the fluid 150 may move the path of the fluid 150 described with reference to FIG.

The piston 120 recovered in step S140 is prepared as an initial step for reusing the load limiter 100 so that steps S110, S120, S130, and S140 may be repeatedly performed.

Up to now, a load limiter and an operation method thereof according to an embodiment of the present invention have been described with reference to Figs.

A load limiter according to an embodiment of the present invention includes a cylinder, a piston, a spring, and a partition wall, and the piston can reciprocate within the cylinder. The flow rate of the fluid is controlled by the reciprocating movement of the piston, and the amount of impact generated from the outside by the frictional heat emitted from the fluid while moving on the movement path can be alleviated.

A load limiter according to an embodiment of the present invention can provide a high-performance rod limiter in which an external impact is mitigated by an orifice formed in a cylinder when the piston reciprocates and an operation method thereof.

The load limiter according to an embodiment of the present invention can provide a long-life load limiter and an operation method thereof, in which the buckling of the spring is prevented by the partition wall and the cylinder can be used a plurality of times easily.

The load limiter according to an embodiment of the present invention can provide a highly efficient load limiter applicable to hydraulic cylinders and pneumatic cylinders and a method of operation thereof.

The load limiter according to an embodiment of the present invention can provide a highly efficient load limiter capable of being separated from the air bag and an operation method thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

100; Load limiter
110; cylinder
112; Inner cylinder
115; Closed end
117; Open end
120; piston
125; Piston head
128; Piston rod
130; spring
140; septum
150; Fluid
160; Orifice
160A; Orifice A
160B; Orifice B
165; As a fluid
170; L-shaped bracket
180; bearing
200; Retractor
210; safety belt
300; seat
310; Fixture

Claims (12)

A piston connected at one end to a retractor and extending the length of the seat belt when the retractor operates according to the occurrence of an external impact;
A spring connected to the other end of the piston to provide a restoring force to the piston; And
And a cylinder provided with a wall for limiting a travel path of the piston when the piston moves toward the retractor so as to extend the length of the seat belt.
The method according to claim 1,
The spring being located between the closed end of the cylinder and the head of the piston to support the reciprocating movement of the piston.
The method according to claim 1,
Wherein the cylinder is one of a hydraulic cylinder and a pneumatic cylinder.
The method according to claim 1,
Wherein the cylinder further comprises an orifice communicating with a fluid pathway outside the cylinder,
Wherein the fluid flowing into the fluid path through the orifice is configured to absorb an externally applied impact.
5. The method of claim 4,
Wherein the fluid is provided between the piston and the partition in the cylinder,
Wherein when the piston moves toward the retractor so as to extend the length of the seat belt, the fluid absorbs an external shock by moving the fluid through the orifice to the fluid path.
The method according to claim 1,
And the partition wall prevents buckling of the spring by limiting the movement distance of the piston.
The method according to claim 1,
Further comprising an L-shaped bracket,
And the L-shaped bracket connects the retractor and the cylinder, thereby transmitting an external impact transmitted from the retractor to the cylinder.
The method according to claim 1,
Further comprising a bearing,
Wherein the bearing connects the base and the cylinder such that the cylinder rotates about the bearing.
A moving step of moving the piston so as to increase the length of the seat belt when the retractor is operated by an external impact;
A blocking step in which the movement of the piston is blocked by the partition wall; And
And restoring the piston by restoring force of a spring connected to the other end of the piston.
10. The method of claim 9,
Wherein the step of moving the piston and the step of restoring the piston are repeatedly performed by the spring.
10. The method of claim 9,
Wherein the moving step further comprises an impact mitigation step in which the fluid located between the head of the piston and the partition wall passes through the orifice to alleviate the external impact.
12. The method of claim 11,
Wherein the shock mitigation step includes flowing fluid that has passed through the orifice into a space opposite the head of the piston and the partition.
KR1020150104830A 2015-07-24 2015-07-24 A Load Limiter and An Operating Method Thereof KR101706464B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200117386A (en) * 2019-04-04 2020-10-14 현대모비스 주식회사 Active seat belt apparatus
DE102019208718B4 (en) 2019-06-14 2022-06-09 Volkswagen Aktiengesellschaft Belt force limiter for a motor vehicle and a belt lock unit and a motor vehicle with a belt force limiter according to the invention and a method for operating the belt force limiter

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KR950033170A (en) * 1994-05-30 1995-12-22 경주현 Double cylinder type shock absorber
KR970039278A (en) * 1995-12-14 1997-07-24 이우복 Bumper stay of automobile using oil damping cylinder
KR0129275Y1 (en) * 1994-09-08 1998-12-15 전성원 Seat belt pressure load softening device
KR100226982B1 (en) * 1995-12-22 1999-10-15 정몽규 Energy absorbing device of seat belt
KR20040098388A (en) 2003-05-14 2004-11-20 현대모비스 주식회사 Seatbelt controll unit and the method of the unit

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Publication number Priority date Publication date Assignee Title
KR950033170A (en) * 1994-05-30 1995-12-22 경주현 Double cylinder type shock absorber
KR0129275Y1 (en) * 1994-09-08 1998-12-15 전성원 Seat belt pressure load softening device
KR970039278A (en) * 1995-12-14 1997-07-24 이우복 Bumper stay of automobile using oil damping cylinder
KR100226982B1 (en) * 1995-12-22 1999-10-15 정몽규 Energy absorbing device of seat belt
KR20040098388A (en) 2003-05-14 2004-11-20 현대모비스 주식회사 Seatbelt controll unit and the method of the unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200117386A (en) * 2019-04-04 2020-10-14 현대모비스 주식회사 Active seat belt apparatus
DE102019208718B4 (en) 2019-06-14 2022-06-09 Volkswagen Aktiengesellschaft Belt force limiter for a motor vehicle and a belt lock unit and a motor vehicle with a belt force limiter according to the invention and a method for operating the belt force limiter

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