KR20220128702A - Safety ventilating device for seatbelt retractor - Google Patents

Abstract

The present invention relates to a safety exhaust device of a seatbelt retractor and, particularly, to a safety exhaust device of a seatbelt retractor for increasing a gas sealing force depending on gas pressure during the operation of a gas generator while maintaining a gap in a closed space in contact with the gas generator in a tube and when the pressure in the closed space exceeds a certain pressure, exhausts the gas in the closed space to a mass body space in the tube. The safety exhaust device of a seatbelt retractor of the present invention comprises: a gas generator; a tube having one end to which the gas generator is mounted and the other end connected to a driving part related to the rotation of a seatbelt and accommodating a mass body therein; and an exhaust assembly disposed inside the tube between the gas generator and the tube. A first space between the exhaust assembly and the gas generator is sealed by the exhaust assembly. A mass is accommodated in a second space between the exhaust assembly and the other end of the tube. During the explosion operation of the gas generator, the exhaust assembly increases the gas sealing force to the first space as the gas pressure increases.

Description

SAFETY VENTILATING DEVICE FOR SEATBELT RETRACTOR

The present invention relates to a safety exhaust device for a seat belt retractor, and more particularly, while maintaining a gap in a closed space in contact with a gas generator in a pipe and increasing a gas sealing force according to the gas pressure when the gas generator is operated, the pressure in the enclosed space is constant It relates to a safety exhaust device for a seat belt retractor that exhausts gas in an enclosed space to a mass space in a tube when the pressure is exceeded.

A common type of tensioning device has a problem that the pressure conditions during the tensioning process change very strongly. In particular, very high pressure peaks can cause damage to the components of the tensioning device or the breakdown of the operating cycle of the tensioning device.

DE 195 45 795 C1 already discloses a pyrotechnical actuation device with an overpressure protection device, in which an excess of a predetermined pressure in the tensioning device pipe is prevented. In this solution, a gas generator having a gas generator casing arranged in the tube and an opening in the gas generator region of the tube is provided. Exceeding a predetermined pressure causes the wall of the gas generator casing to be pushed into the opening in the tube and deformed, causing the wall to tear off and open the opening.

A disadvantage of this solution is that pressure is applied outwardly from the tube, which then generates a hot beam or even a flash, whereby the flame can damage neighboring parts.

The present invention maintains the distance in the enclosed space in contact with the gas generator in the tube and increases the gas sealing force according to the gas pressure during operation of the gas generator. An object of the present invention is to provide a safety exhaust device for a seat belt retractor that exhausts the vehicle.

The safety exhaust device of the seat belt retractor according to the present invention includes a gas generator, one end of which is equipped with a gas generator and the other end is connected to a driving unit related to rotation of the seat belt and accommodates a mass therein, and a tube between the gas generator and the tube. having an exhaust assembly disposed therein, wherein a first space between the exhaust assembly and the gas generator is closed by the placement assembly, and a mass is accommodated in a second space between the exhaust assembly and the other end of the tube, wherein the gas generator explodes The exhaust assembly increases the gas sealing force to the first space as the gas pressure increases.

In addition, it is preferable that the contact area with the inner surface of the tube increases while the exhaust assembly contracts in a direction parallel to the central axis of the tube as the gas pressure increases.

Further, it is preferable that the exhaust assembly forms an exhaust flow path for communicating the first space and the second space when the pressure in the first space exceeds the reference exhaust pressure.

In addition, the exhaust assembly includes an exhaust case having a space forming part for forming an accommodation space from the first space to the second space, a packing part made of an elastic material and having a hollow formed on the central axis and in contact with the inner surface of the pipe, and the packing; It is preferable that the gas distribution part communicates with the hollow of the part and has at least one flow path toward the inner surface of the tube, and the space forming part is inserted at least partially into the hollow.

In addition, after the space forming part is in contact with the packing part as the packing part is contracted, a part of the space forming part is ruptured to form an exhaust flow path communicating the first space and the exhaust case and the hollow of the packing part or the flow path of the gas distribution part and the second space. It is preferable to be

The present invention maintains the distance in the enclosed space in contact with the gas generator in the tube and increases the gas sealing force according to the gas pressure during operation of the gas generator. By evacuating to the evacuation system, there is an effect of preventing damage to the pipe or the like.

1 is a partial cutaway view of a safety exhaust device of a seat belt retractor according to the present invention.
FIG. 2 is a partial cross-sectional view of the safety exhaust device of FIG. 1 in operation;

Hereinafter, the present invention will be described in detail through examples and drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that various modifications, equivalents, and/or alternatives of the embodiments of the present invention are included. In connection with the description of the drawings, like reference numerals may be used for like components.

In this document, expressions such as "have", "may have", "includes", or "may include" refer to the presence of a corresponding characteristic (eg, a numerical value, function, operation, or component such as a part). and does not exclude the presence of additional features.

In this document, expressions such as “A or B”, “at least one of A or/and B”, or “one or more of A or/and B” may include all possible combinations of the items listed together. . For example, "A or B", "at least one of A and B", or "at least one of A or B" means (1) includes at least one A, (2) includes at least one B; Or (3) it may refer to all cases including both at least one A and at least one B.

Expressions such as "first", "second", "first", or "second" used in this document may modify various elements, regardless of order and/or importance, and may modify one element to another. It is used only to distinguish it from the components, and does not limit the components. For example, the first user equipment and the second user equipment may represent different user equipment regardless of order or importance. For example, without departing from the scope of rights described in this document, a first component may be referred to as a second component, and similarly, the second component may also be renamed as a first component.

A component (eg, a first component) is "coupled with/to (operatively or communicatively)" to another component (eg, a second component) When referring to "connected to", it should be understood that the certain element may be directly connected to the other element or may be connected through another element (eg, a third element). On the other hand, when it is said that a component (eg, a first component) is "directly connected" or "directly connected" to another component (eg, a second component), the component and the It may be understood that other components (eg, a third component) do not exist between other components.

The expression "configured to (or configured to)" as used in this document, depending on the context, for example, "suitable for", "having the capacity to" It can be used interchangeably with "," "designed to", "adapted to", "made to", or "capable of". The term "configured (or set up to)" may not necessarily mean only "specifically designed to" in hardware. Instead, in some circumstances, the expression “a device configured to” may mean that the device is “capable of” with other devices or parts.

Terms used in this document are only used to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted with the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in this document, have an ideal or excessively formal meaning. not interpreted In some cases, even terms defined in this document cannot be construed to exclude embodiments of this document.

1 is a partial cutaway view of a safety exhaust device of a seat belt retractor according to the present invention.

The seat belt retractor (1) includes a base unit (11), a spool assembly (13) mounted inside the base unit (13) around which a seat belt is wound, and a spool assembly (13) coupled to the base unit (13). It is configured to include a pretensioning assembly 20 operating on a belt rotating shaft (not shown) related to the rotation of the , and a gas generator 22 mounted on the tube 24 of the pretensioning assembly 20 .

The pretensioning assembly 20 is a device for actively adjusting the seat belt when an accident occurs, and a driving wheel (not shown) for rotating the belt rotating shaft, a gas generator 22 is mounted on one end, and the other end is driven A tube 24 connected to the wheel and accommodating the mass 26 therein, and disposed between the gas generator 22 and the mass 26 inside the tube 24, a first space S1 (gas generator 22) ) and a closed space between the exhaust assembly 30) and a second space S2 (a space between the exhaust assembly 30 and the other end of the pipe 24 and provided with the mass 26), It is configured to include an exhaust assembly 30 that seals the space S1 , an elastic body 28 disposed between the exhaust assembly 30 and the gas generator 22 , and the like.

In the tube 24, a series of metallic spherical or bar-shaped masses 26 are moved by the gas pressure generated by the gas generator 22 to rotate the drive wheel, so that the tension motion by the gas pressure is applied to the belt rotating shaft. provided to deliver. The tension movement by this gas pressure also causes the exhaust assembly 30 to move together with the mass 26 . In this case, the pretensioning assembly 20 operates normally, and the exhaust assembly 30 and the mass 26 do not move despite the tension movement by the gas pressure. When the gas pressure in the first space S1 by the gas generator 22 rises due to an abnormal operation (for example, when the mass 26 cannot or does not move in the tube 24), the tube ( 24) etc. is possible, so to prevent such damage, an exhaust assembly 30 is provided.

The exhaust assembly 30 maintains the gap of the first space S1 in contact with the gas generator 22 in the tube 24 before the explosion operation of the gas generator 22, and the outer surface of the exhaust assembly 30 is the tube ( 24) closes the first space (S1) by contacting the inner surface, and as the gas pressure or compression increases during the explosion operation of the gas generator 22, a direction perpendicular to the central axis of the tube 24 (that is, It expands in the direction of the inner surface of the tube 24) to increase the gas sealing force for the first space S1. When the abnormal operation of the pretensioning assembly 20 occurs as described above when the gas sealing force is increased, the exhaust assembly 30 is configured to perform the first operation when the pressure in the first space S1 exceeds a predetermined reference exhaust pressure. By evacuating the gas pressure or gas in the space S1 to the second space S2 in the pipe 24 , damage to the pipe 24 or the like is prevented.

The exhaust assembly 30 includes an exhaust case 32 that forms an accommodating space S3 from the first space S1 to the second space S2, and a hollow 34a formed on the central axis of the tube 24. It is configured to include a packing part 34 in contact with the inner surface of the gas distribution part 36 having at least one flow path 37 communicating with the hollow 34a of the packing part 34 .

The exhaust case 32 includes a space forming part 32a inserted into the hollow 34a of one end of the packing part 34 and forming an accommodation space S3, and a support part 32b formed around the space forming part 32a. include The space forming part 32a of the exhaust case 32 is inserted into the hollow 34a of the packing part 34, and the supporting part 32b is not inserted into the hollow 34a of the packing part 34, but the packing part 34 ) in contact with one end to support the exhaust case 32 . The exhaust case 32 may be formed of a metal material. Since the space forming portion 32a is inserted into the hollow 34a, at least a portion of the receiving space S3 is located in the hollow 34a.

The packing part 34 is formed of an elastic material, and has a structure in which the outer surface of the packing part 34 is in close contact with or in contact with the inner surface of the tube 24 when it is inserted into the tube 24 or the packing part 34 The outer diameter of is to be greater than or equal to the inner diameter of the tube (24). In addition, the exhaust case 32 is moved by the gas pressure from the first space (S1) to the second space (S2), the packing part 34 is contracted in a direction parallel to the central axis of the hollow (34a), such During parallel contraction, the contact area with the inner surface of the tube 24 in the direction perpendicular to the central axis of the hollow 34a also increases, thereby increasing the gas sealing force with respect to the first space S1.

The gas distribution unit 36 includes an insertion portion 36a inserted into the hollow 34a of the other end of the packing portion 34 to seal the hollow 34a, and an insertion portion 36a formed around the insertion portion 36a to form the packing portion 34 at the other end. It is configured to include a distribution support portion 36b in contact with the outer surface of the insertion portion 36a and the distribution support portion 36b, one end communicates with the hollow 34a of the packing portion 34 inside the tube 24 At least one flow path 37 toward the inner surface of the is formed. That is, the other end of the flow path 37 is preferably formed on the side surface of the distribution support portion 36b, and in order to prevent contact with the inner surface of the tube 24, the diameter of the distribution support portion 36b is the tube 24. It is preferably formed to be smaller than the inner diameter of

1, the bottom surface of the space forming part 32a inserted into one side of the hollow 34a and the upper surface of the inserting part 36a inserted into the other side of the hollow 34a are spaced apart from each other by a predetermined distance ( 34a) to form a separation space therein. When the exhaust assembly 30 and the mass body 26 do not move despite the tension movement by the gas pressure, the exhaust case 32 compresses the packing part 34 as the gas pressure increases by forming a separation space. It is possible to move toward the gas distribution unit 36 while making or contracting, and the space between the exhaust case 32 and the packing unit 34 is gradually narrowed. This process is described in detail in FIG. 2 .

The elastic body 28 corresponds to a device for maintaining the minimum capacity of the first space S1 or the minimum gap between the gas generator 22 and the exhaust assembly 30, and may be implemented as a spring or the like. .

The safety exhaust device according to the present invention includes at least an exhaust assembly 30 or additionally includes a gas generator 22 , a tube 24 , a mass 26 and an elastic body 28 , and the seat belt retractor (1) It should be understood that it is provided in

FIG. 2 is a partial cross-sectional view of the safety exhaust device of FIG. 1 in operation;

FIG. 2A shows a state in which the gas generator 22 of the seat belt retractor is not exploded (initial state). The state of FIG. 2 ( a ) is the same as the state of FIG. 1 , and the exhaust assembly 30 seals the first space S1 .

As the gas pressure in the first space (S1) increases as the gas generator 22 explodes, as shown in FIG. (32) can be moved from the first space (S1) to the second space (S2) in the direction closer to the gas distribution part (36), so that the packing part (34) is hollow (34a) by the movement of the exhaust case (32). ) is compressed in a direction parallel to the central axis, and the pressure in the separation space between the exhaust case 32 and the gas distribution part 36 also gradually increases so that the outer surface of the stocking part 34 is the inner surface of the tube 24 . is expanded toward and the contact area between the inner surface of the tube 24 in the vertical direction of the central axis of the hollow 34a and the outer surface of the packing part 34 also increases, so that the gas for the first space S1 The sealing force is also increased. At this time, the exhaust assembly 30 itself may move and come into contact with the mass 26. In the packing part 34, the bottom surface of the space forming part 32a of the exhaust case 32 is the gas distribution part. It can be parallel-contracted until it contacts the upper surface of the insertion part 36a of 36. In order to prevent contact with the inner surface of the pipe 24 when the exhaust case 32 is moved, the packing part 34 ) is formed on the upper side of the stepped portion 34b, it is preferable that the support portion 32b of the exhaust case 32 is inserted and seated in the stepped portion 34b.

FIG. 2(c) shows the mass body 26 and the exhaust assembly 30 even by the gas pressure in the first space S1, even when the mass body 26 and the gas distribution part 36 of the exhaust assembly 30 come into contact with each other. is not moving. In this case, after the bottom surface of the space forming part 32a of the exhaust case 32 contacts the upper surface of the inserting part 36a of the gas distribution part 36, the insertion part 36a from the bottom surface of the space forming part 32a ) of the hollow (34a) facing or in contact with the portion 33 is the most vulnerable to the gas pressure, when the gas pressure in the first space (S1) exceeds the exhaust reference pressure, the pressure in the spaced space also increases significantly, so that the bottom A portion of the 33 is sheared or ruptured. By the front end of this bottom surface, the hollow of the first space S1, the exhaust case 32, and the packing part 34 or an exhaust flow path to the flow path 37 and the second space S2 is formed to form the first space ( The gas pressure or gas in S1 is exhausted to the second space S2, whereby damage to the pipe 24 or the like is prevented.

According to the magnitude of the above-described reference exhaust pressure, the shrinkage length of the packing part 34 and/or the movement distance of the exhaust case 32 are determined.

As another embodiment, in FIG. 2 , a through hole (not shown) communicating with the flow path 37 is also formed on the bottom surface of the distribution support part 36b that can be in contact with or come into contact with the mass body 26 , so that the flow path 37 is formed. Gas pressure or gas may be exhausted to the second space S2 through the bottom surface of the distribution support 36b as well as the side surface of the distribution support 36b.

As described above, the present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary skill in the art to which the invention pertains can use various methods without departing from the gist of the invention as claimed in the claims. It goes without saying that modifications are possible, and such modifications are intended to be within the scope of the claims.

22: gas generator 24: mass
30: exhaust assembly

Claims (5)

a gas generator;
a tube having a gas generator mounted at one end and connected to a driving unit related to rotation of the seat belt at the other end and accommodating a mass therein;
an exhaust assembly disposed within the tube between the gas generator and the tube;
A first space between the exhaust assembly and the gas generator is sealed by the placement assembly, and a mass is accommodated in a second space between the exhaust assembly and the other end of the tube,
The safety exhaust device of a seat belt retractor, characterized in that when the gas generator is operated in an explosive operation, the exhaust assembly increases the gas sealing force to the first space as the gas pressure increases. The method of claim 1,
The exhaust assembly contracts in a direction parallel to the central axis of the tube as the gas pressure increases, and expands in a direction perpendicular to the central axis of the tube to increase the contact area with the inner surface of the tube. Tractor safety exhaust. The method of claim 1,
wherein the exhaust assembly forms an exhaust flow path for communicating the first space and the second space when the pressure in the first space exceeds the reference exhaust pressure. 4. The method according to any one of claims 1 to 3,
The exhaust assembly includes an exhaust case having a space forming part that forms a receiving space from a first space to a second space, a packing part made of an elastic material, a hollow is formed on the central axis, and is in contact with the inner surface of the pipe, and the hollow of the packing part It communicates with and consists of a gas distribution unit having at least one flow path toward the inner surface of the tube,
At least a portion of the space forming part is inserted into the hollow,
The space forming part and the gas distribution part are spaced apart from each other in the hollow in the packing part,
As the gas pressure increases, the gap between the space forming part and the gas distribution part narrows, preventing the packing part from being contracted. The safety exhaust system of the seat belt retractor featuring. 5. The method of claim 4,
After the space forming part is in contact with the flow path of the gas distribution part as the packing part is contracted, a part of the space forming part is ruptured to form the first space and the exhaust case and the hollow of the packing part or an exhaust flow path communicating the flow path and the second space of the gas distribution part The safety exhaust system of the seat belt retractor, characterized in that it becomes.

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