KR102496949B1 - Safety ventilating device for seatbelt retractor - Google Patents

Abstract

The present invention relates to a safety exhaust device for a seat belt retractor, and in particular, while maintaining a gap in a closed space in contact with a gas generator in a pipe, increasing gas sealing power according to gas pressure during operation of a gas generator while maintaining a constant pressure in the closed space A safety exhaust device for a seat belt retractor that exhausts gas in an enclosed space to a mass body space in a tube when the pressure is exceeded.
The safety exhaust device of the seat belt retractor of the present invention includes a gas generator, one end of which the gas generator is mounted and the other end connected to a drive part related to the rotation of the seat belt, and a tube for accommodating a mass body therein, and a pipe between the gas generator and the tube An exhaust assembly disposed therein, a first space between the exhaust assembly and the gas generator is sealed by the arrangement assembly, a mass is accommodated in a second space between the exhaust assembly and the other end of the tube, and the gas generator explodes. At this time, the exhaust assembly increases gas tightness with respect to the first space as the gas pressure increases.

Description

Safety exhaust device of seat belt retractor {SAFETY VENTILATING DEVICE FOR SEATBELT RETRACTOR}

The present invention relates to a safety exhaust device for a seat belt retractor, and in particular, while maintaining a gap in a closed space in contact with a gas generator in a pipe, increasing gas sealing power according to gas pressure during operation of a gas generator while maintaining a constant pressure in the closed space A safety exhaust device for a seat belt retractor that exhausts gas in an enclosed space to a mass body space in a tube when the pressure is exceeded.

There is a problem with tensioning devices of the general type that the pressure conditions change very strongly during the tensioning process. In particular, very high pressure peaks may cause damage to components of the tensioning device or breakdown of the operating cycle of the tensioning device.

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

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

The present invention increases the gas sealing force according to the gas pressure during operation of the gas generator while maintaining the gap in the sealed space in contact with the gas generator in the pipe, and when the pressure in the sealed space exceeds a certain pressure, the gas in the sealed space is released into the mass body space in the pipe. It is an object of the present invention to provide a safety exhaust device for a seat belt retractor that exhausts with

The safety exhaust device of the seat belt retractor of the present invention includes a gas generator, one end of which the gas generator is mounted and the other end connected to a drive part related to the rotation of the seat belt, and a tube for accommodating a mass body therein, and a pipe between the gas generator and the tube An exhaust assembly disposed therein, wherein 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, and the gas generator explodes. At this time, the exhaust assembly increases gas tightness to the first space as the gas pressure increases.

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

In addition, the exhaust assembly preferably forms an exhaust passage that communicates the first space and the second space when the pressure in the first space exceeds the standard exhaust pressure.

In addition, the exhaust assembly includes an exhaust case having a space forming part forming an accommodation space heading 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 contacting the inner surface of the tube, and packing It is composed of a gas distribution part communicating with the hollow of the part and having at least one or more flow passages facing the inner surface of the tube, and it is preferable that at least a part of the space forming part is inserted into the hollow.

In addition, after the packing part contracts and the space forming part contacts the packing part, a part of the space forming part is ruptured to form an exhaust passage 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 desirable to be

The present invention increases the gas sealing force according to the gas pressure during operation of the gas generator while maintaining the gap in the sealed space in contact with the gas generator in the pipe, and when the pressure in the sealed space exceeds a certain pressure, the gas in the sealed space is released into the mass body space in the pipe. By exhausting it, 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.
2 are partial cross-sectional views of the safety exhaust device of FIG. 1 during operation.

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

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

In this document, expressions such as "A or B", "at least one of A and/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" includes (1) at least one A, (2) at least one B, Or (3) may refer to all cases including at least one A and at least one B.

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

A component (e.g., a first component) is "(operatively or communicatively) coupled with/to" another component (e.g., a second component); When referred to as "connected to", it should be understood that the certain component may be directly connected to the other component or connected through another component (eg, a third component). On the other hand, when an element (eg, a first element) is referred to as being “directly connected” or “directly connected” to another element (eg, a second element), the element and the above It may be understood that other components (eg, a third component) do not exist between the other components.

As used in this document, the expression "configured to" means "suitable for", "having the capacity to", depending on the situation. ", "designed to", "adapted to", "made to", or "capable of" can be used interchangeably. The term "configured (or set) to" may not necessarily mean only "specifically designed to" hardware. Instead, in some contexts, the phrase "a device configured to" may mean that the device is "capable of" in conjunction with other devices or components.

Terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this document. Among the terms used in this document, the terms defined in general dictionaries may be interpreted as having the same or similar meaning to the meaning in the context of the related art, and unless explicitly defined in this document, in an ideal or excessively formal meaning. not interpreted In some cases, even terms defined in this document cannot be interpreted to exclude the 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 to wind a seat belt, and a spool assembly 13 coupled to the base unit 13 It is configured to include a pre-tensioning assembly 20 operating on a belt rotating shaft (not shown) related to the rotation of the pre-tensioning assembly 20 and a gas generator 22 mounted on the pipe 24 of the pre-tensioning assembly 20.

The pre-tensioning assembly 20 is a device for actively adjusting a seat belt in the event of an accident, and a driving wheel (not shown) for rotating a belt rotation shaft and a gas generator 22 are mounted on one end and driven on the other end. A tube 24 connected to the wheel and accommodating the mass body 26 therein, and disposed between the gas generator 22 and the mass body 26 inside the tube 24 to form a first space S1 (gas generator 22 ) and the exhaust assembly 30) and the second space S2 (a space between the exhaust assembly 30 and the other end of the pipe 24, in which the mass body 26 is provided), and the first It is configured to include an exhaust assembly 30 that seals the space S1 and 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 spheres or bar-shaped masses 26 are moved by the gas pressure generated by the gas generator 22 to rotate the driving wheel, so that the gas pressure tension movement is applied to the belt rotating shaft. equipped to deliver The tension movement due to the gas pressure causes the exhaust assembly 30 to move together with the mass body 26 . In this case, the pretensioning assembly 20 operates normally, and the exhaust assembly 30 and the mass body 26 do not move despite the tension movement by the gas pressure. If the gas pressure in the first space S1 by the gas generator 22 rises due to an abnormal operation (for example, when the mass body 26 cannot or does not move within the pipe 24), the pipe ( 24) is possible, so in order to prevent such damage, the exhaust assembly 30 is provided.

The exhaust assembly 30 maintains a distance between the first space S1 in the pipe 24 in contact with the gas generator 22 before the gas generator 22 explodes, and the outer surface of the exhaust assembly 30 is the pipe ( 24) to seal the first space (S1), and as the gas pressure or compression increases during the explosion operation of the gas generator 22, the direction perpendicular to the central axis of the pipe 24 (ie, It expands in the direction of the inner surface of the tube 24) to increase the gas sealing force with respect to the first space (S1). When the abnormal operation of the pre-tensioning assembly 20 occurs when the gas sealing force is increased as described above, the exhaust assembly 30 generates a first pressure when the pressure in the first space S1 exceeds a predetermined standard exhaust pressure. By exhausting 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 forming an accommodating space S3 from a first space S1 to a second space S2, a hollow 34a is formed on a central axis, and a tube 24 It is configured to include a packing part 34 in contact with the inner surface of the packing part 34 and a gas distribution part 36 having at least one flow path 37 communicating with the hollow part 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 support part 32b is not inserted into the hollow 34a of the packing part 34 and the packing part 34 ) to support the exhaust case 32 by contacting one end of the. The exhaust case 32 may be formed of a metal material. Since the space forming part 32a is inserted into the hollow 34a, at least a part of the accommodating 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 adheres to or contacts the inner surface of the tube 24 when inserted into the tube 24, or the packing part 34 The outer diameter of is greater than or equal to the inner diameter of the tube (24). In addition, the exhaust case 32 moves from the first space S1 to the second space S2 by gas pressure, and the packing part 34 contracts in a direction parallel to the central axis of the hollow 34a. During parallel contraction, the contact area with the inner surface of the tube 24 in the vertical direction of the central axis of the hollow 34a is increased, so that the gas sealing force for the first space S1 is also increased.

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

As shown in FIG. 1, the bottom surface of the space forming portion 32a inserted into one side of the hollow 34a and the upper surface of the insertion portion 36a inserted into the other side of the hollow 34a are spaced apart from each other at a predetermined interval so that the hollow ( 34a) to form a separation space. When the exhaust assembly 30 and the mass body 26 do not move despite the tension movement due to the gas pressure, the exhaust case 32 compresses the packing part 34 as the gas pressure increases by forming a separation space. It can be moved toward the gas distribution unit 36 while being compressed or contracted, and the separation space between the exhaust case 32 and the packing unit 34 gradually narrows. This process is described in detail in FIG. 2 .

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

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

2 are partial cross-sectional views of the safety exhaust device of FIG. 1 during operation.

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

As the gas generator 22 explodes and the gas pressure in the first space S1 increases, as shown in (b) of FIG. 2, there is a separation space between the exhaust case 320 and the gas distributor 36, (32) can be moved from the first space (S1) to the second space (S2) so as to be closer to the gas distribution part (36), so that the packing part (34) is hollow (34a) by the movement of the exhaust case (32). ), and the pressure in the separation space between the exhaust case 32 and the gas distribution part 36 gradually increases, so that the outer surface of the bulking part 34 is the inner surface of the pipe 24 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 is also increased, so that the gas for the first space S1 At this time, the exhaust assembly 30 itself may move and come into contact with the mass body 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 contracted in parallel 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 moves, the packing part 34 ) is formed on the upper side of the stepped portion 34b, and it is preferable that the support portion 32b of the exhaust case 32 is inserted and seated in the stepped portion 34b.

In (c) of FIG. 2 , even if the mass body 26 and the gas distribution unit 36 of the exhaust assembly 30 are in contact, the mass body 26 and the exhaust assembly 30 are separated by the gas pressure in the first space S1. This is the case when is not moved. In this case, after the bottom surface of the space forming part 32a of the exhaust case 32 comes into contact with the upper surface of the insertion part 36a of the gas distribution part 36, the insertion part 36a is removed from the bottom surface of the space forming part 32a. Since the portion 33 facing or contacting the hollow 34a of the ) is the most vulnerable to gas pressure, when the gas pressure in the first space S1 exceeds the exhaust standard pressure, the pressure in the spaced space also increases considerably, so that the bottom surface A portion 33 of is sheared or ruptured. By the front end of the bottom surface, an exhaust flow path to the first space S1, the exhaust case 32, the hollow or flow path 37 of the packing part 34 and the second space S2 is formed, so that the first space ( The gas pressure or gas in S1) is exhausted to the second space S2, thereby preventing damage to the pipe 24 or the like.

Depending on the size of the standard exhaust pressure described above, the contraction length of the packing part 34 and/or the moving 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 formed on the bottom surface of the distribution support 36b that is in contact with or can be contacted with the mass body 26, so that the flow path 37 Gas pressure or gas may be exhausted into the second space S2 through the bottom surface of the distribution support part 36b as well as the side surface of the distribution support part 36b.

As described above, the present invention is not limited to the specific preferred embodiments described above, and anyone having ordinary knowledge in the technical field to which the present invention pertains can do various things without departing from the gist of the present invention claimed in the claims. Of course, variations are possible, and such variations are within the scope of the claims.

22: gas generator 24: mass body
30: exhaust assembly

Claims (5)

a gas generator;
a tube having one end mounted with a gas generator and the other end connected to a driving part related to the rotation of the seat belt and accommodating a mass body therein;
an exhaust assembly disposed inside the tube between the gas generator and the tube;
The first space between the exhaust assembly and the gas generator is sealed by the locating assembly, and the mass is accommodated in the second space between the exhaust assembly and the other end of the pipe;
During the explosion operation of the gas generator, the exhaust assembly increases gas sealing force with respect to the first space as the gas pressure increases,
The exhaust assembly includes an exhaust case having a space forming part forming an accommodating space from a first space to a second space, a packing part made of an elastic material and having a hollow formed on a central axis and contacting the inner surface of the tube, and a hollow part of the packing part. It is in communication with and consists of a gas distribution unit having at least one flow path toward the inner surface of the pipe.
The space forming portion is at least partially 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,
A safety exhaust device of a seat belt retractor, characterized in that the packing part shrinks as the gap between the space forming part and the gas distribution part narrows as the gas pressure increases. According to claim 1,
The exhaust assembly shrinks 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, increasing the contact area with the inner surface of the tube. Tractor safety exhaust system. According to claim 1,
The safety exhaust device of a seat belt retractor, characterized in that the exhaust assembly forms an exhaust flow path communicating the first space and the second space when the pressure in the first space exceeds a standard exhaust pressure. delete According to claim 1,
After the packing part contracts and the space forming part contacts the flow path of the gas distribution part, a part of the space forming part is ruptured to form an exhaust passage 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. Safety exhaust device of the seat belt retractor, characterized in that being.

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