Seat belt pretensioners, seat belt pretensioning systems, and seat systems

Abstract

This disclosure relates to a seatbelt pretensioner for installation on a seat. The seatbelt pretensioner includes a tube, a transmission element, and a pretensioning assembly. The tube includes a first tube portion and a second tube portion. The first tube portion has a first limiting structure configured to cooperate with a second limiting structure on a column. The first limiting structure on the first tube portion includes a first planar structure configured to cooperate with a parallel planar structure of the second limiting structure to restrict at least one degree of freedom of the tube within the column. This disclosure also relates to a seatbelt pretensioner with an adapter. This disclosure further relates to a seatbelt pretensioning system including the above-described seatbelt pretensioners. With this seatbelt pretensioner, at least one degree of freedom of the tube within the column can be restricted.

Description

Technical Field

[0001] This disclosure relates to the field of automotive safety technology, and more specifically to seat belt pretensioners, seat belt pretensioning systems, and seat systems. Background Technology

[0002] The function of the seat belt pretensioner is to quickly tighten the webbing after a collision, eliminating the gap between the occupant and the webbing. This can prevent the occupant from falling and reduce the injury to the occupant in the collision.

[0003] like Figure 1 As shown, existing seat belt pretensioners are typically installed on the seat. The seat belt pretensioner includes a tube (e.g., a steel pipe) 21, a steel wire rope 22, and a pretensioning assembly 23. The steel pipe 21 is fixed inside the column 10. The pretensioning assembly 23 is located inside the steel pipe 21 and can move axially within the steel pipe 21. One end of the steel wire rope 22 is fixedly connected to the pretensioning assembly 23, and the other end is fixedly connected to the webbing 30. When a car collides, the pretensioning assembly 23 will be triggered and move axially within the steel pipe 21. The steel wire rope 22 pulls the webbing 30 in the column 10 toward the steel pipe 21, thereby tightening the webbing.

[0004] However, in the prior art, the steel pipe 21 is fixed to the pipe column 10 by bolts 24, which restricts the axial and circumferential degrees of freedom of the steel pipe 21. Therefore, both the steel pipe 21 and the pipe column 10 are provided with screw holes. During installation, the steel pipe 21 needs to be placed into the pipe column 10 first, and the screw holes of the two need to be aligned. Then, the bolts 24 are passed through the screw holes of the two to achieve fixation. In order to achieve the alignment of the screw holes, the installer needs to constantly adjust the axial and circumferential position of the steel pipe 21 in the pipe column 10, which makes the installation complicated and very inconvenient. Utility Model Content

[0005] The purpose of this disclosure is to provide a seat belt pretensioner, a seat belt pretensioning system including the seat belt pretensioner, and a seat system including the seat belt pretensioner or the seat belt pretensioning system, wherein the seat belt pretensioner is capable of cooperating with a second limiting structure on the tube column to restrict at least one degree of freedom of the tube body in the tube column, thereby facilitating the installation of the tube body.

[0006] Therefore, one aspect of this disclosure relates to a seatbelt pretensioning device for installation on a seat. The seatbelt pretensioning device includes a tube, a transmission element, and a pretensioning assembly. The tube is configured for installation within the seat column. The tube includes a first tube portion and a second tube portion, which are fixedly connected. The first tube portion has a first limiting structure configured to cooperate with a second limiting structure on the seat column. The pretensioning assembly is slidably disposed within the tube. The transmission element is fixedly connected at one end to a webbing and at the other end passes through the first tube portion and enters the tube, where it is fixedly connected to the pretensioning assembly. The first limiting structure on the first tube portion includes a first planar structure, which is configured to cooperate with the second planar structure of the second limiting structure to restrict at least one degree of freedom of the tube within the seat column.

[0007] In this disclosure, the first planar structure of the first limiting structure is configured to cooperate with the second planar structure of the second limiting structure to restrict at least one degree of freedom of the tube body within the tubing. This allows for the restriction of at least one degree of freedom of the tube body, particularly at least the circumferential degree of freedom, through the simple first planar structure of the first limiting structure in conjunction with the second planar structure of the second limiting structure of the tubing. Machining the planar structure onto the tube body is relatively simple in terms of process, which can result in higher dimensional accuracy and dimensional stability.

[0008] In some embodiments, the first limiting structure includes two or more first planar structures arranged circumferentially along the first tube portion. This provides more possibilities for the positional design of the corresponding first planar structures of the first limiting structure.

[0009] In some embodiments, the two or more first planar structures of the first limiting structure are evenly distributed along the circumference of the first tube portion. This means that the centerlines of any two adjacent first planar structures of the first limiting structure are correspondingly spaced apart by the same angular interval along the circumference of the first tube portion. Thus, for example, when both the first and second limiting structures include parallel planar structures, and corresponding portions of the parallel planar structures in the second and first limiting structures need to be fastened together by fasteners, the remaining parallel planar structures of the first limiting structure without fasteners can be well supported on their corresponding parallel planar structures in the second limiting structure. Furthermore, for example, when the first limiting structure includes two or more inclined structures, this uniform arrangement of the two or more inclined structures enables good alignment of the tube within the column.

[0010] In some embodiments, two first planar structures are provided on the first tube body portion, arranged radially opposite each other. This allows for, for example, the aforementioned good support of the parallel planar structure (without fasteners) on the corresponding second planar structure of the second limiting structure (which is also a parallel planar structure) when the first limiting structure includes multiple parallel planar structures, or good alignment of the tube body within the tube column when the first limiting structure includes multiple inclined plane structures.

[0011] In some embodiments, some or all of the first planar structures in the first limiting structure are constructed as parallel planar structures, and the plane of the parallel planar structure of the first limiting structure is parallel to the central longitudinal axis of the tube. Thus, the parallel planar structure of the first limiting structure can cooperate well with the parallel planar structure of the second limiting structure to achieve good circumferential degree of freedom restriction of the tube.

[0012] In some embodiments, the first tube portion has a fixed connection portion in at least one region of a parallel planar structure, the fixed connection portion being used for the fixed connection of fasteners. The fixed connection portion of the first tube portion in at least one region of a parallel planar structure can be easily aligned with the through hole in the parallel planar structure of the second limiting structure of the tube column, and the fastener fixing can be achieved firmly and precisely based on the planar structure fit.

[0013] In some embodiments, the fixed connection includes a threaded hole and has internal threads. This allows for good connection and positioning accuracy of the fastener.

[0014] In some embodiments, part or all of the first planar structure in the first limiting structure is constructed as an inclined structure, the plane of the inclined structure of the first limiting structure being inclined to the central longitudinal axis of the tube body, wherein the first tube body portion with the inclined structure narrows towards the direction of the second tube body portion. Thus, the inclined structure in the first limiting structure enables good circumferential and axial freedom restriction of the tube body within the tubing. Especially when two or more—preferably evenly distributed circumferentially—inclined structures are provided, or when two inclined structures are radially opposite each other are provided, good alignment of the tube body within the tubing can be achieved. Furthermore, when using an inclined structure, installation gaps can be automatically eliminated during the fixing of the seatbelt pretensioning device (e.g., tensioning fixation), thereby preventing noise caused by gaps. In this disclosure, the first planar structure of the first limiting structure may partially include an inclined structure and partially include a parallel plane structure; or the first planar structure of the first limiting structure may only include an inclined structure; or the first planar structure of the first limiting structure may only include a parallel plane structure.

[0015] In some embodiments, a stop flange is provided at the end of the first tube portion away from the second tube portion. The stop flange can restrict the axial degree of freedom of the tube within the column when necessary. The stop flange may be attached to the inclined structure of the first limiting structure. Furthermore, the stop flange may be provided in place of or attached to fasteners and corresponding through holes.

[0016] In some embodiments, the seatbelt pretensioner includes a hollow insert with a first limiting structure formed on the outside of the insert. The insert is fitted over the outside of a first tubular portion and fixedly connected to it. The first tubular portion is non-cylindrical, and the inner wall shape of the insert matches the outer shape of the first tubular portion. This provides a suitable adapter structure for non-cylindrical first tubular portions.

[0017] In some embodiments, the periphery of the first tube portion has a basic outline of a first cross-section that is truncated to a circle in the region of the first limiting structure, and the first planar structure of the first limiting structure forms a flat portion of the basic outline of the first cross-section that is truncated to a circle. This allows for an advantageous geometry of the first limiting structure of the first tube portion of the tube.

[0018] In some embodiments, the seatbelt pretensioner includes a nut configured to secure the seat post to the end of the second tube portion away from the first tube portion. This allows for tension-type securing in conjunction with a first limiting structure, a second limiting structure, and, if necessary, a stop flange.

[0019] The second aspect of this disclosure relates to a seatbelt pretensioning system, the seatbelt pretensioning system comprising a column and a seatbelt pretensioning device, wherein the seatbelt pretensioning device is a seatbelt pretensioning device according to one of the above embodiments of the first aspect, the tube body of the seatbelt pretensioning device is located inside the column, a second limiting structure is provided on the column, and the first limiting structure and the second limiting structure of the seatbelt pretensioning device cooperate with each other; the transmission element is fixedly connected at one end to a webbing and at the other end passes through the first tube body portion and enters the tube body and is fixedly connected to the pretensioning assembly, characterized in that the second limiting structure on the column includes an inwardly recessed second planar structure, the second planar structure of the second limiting structure of the column and the first planar structure of the first limiting structure of the seatbelt pretensioning device cooperate with each other to restrict at least one degree of freedom of the tube body in the column.

[0020] In this disclosure, the cooperation between the second planar structure of the second limiting structure on the tube column (also called the seat tube) and the first planar structure of the first limiting structure on the first tube body can effectively restrict the circumferential degree of freedom or circumferential motion freedom of the first tube body relative to the tube column. This allows for circumferential positioning of the tube body relative to the tube column during installation and effectively prevents circumferential movement of the tube body relative to the tube column after positioning. This avoids the need for continuous adjustment of the tube body to find the mounting hole position during installation, as in existing technologies, thereby improving installation efficiency, reducing installation time, and ensuring that the installation work is completed within the specified cycle time. Furthermore, forming a planar structure on the tube column is simpler in terms of process. If a bulge is to be formed on the tube column, the size and shape of the bulge are difficult to control, and dimensional inspection is challenging, potentially resulting in different shapes. In this disclosure, a planar structure is formed for the tube column. This planar structure forming method offers better dimensional control, especially compared to bulges, as the plastic forming ratio of this planar structure forming is higher, and the processing technology is simpler and more mature, resulting in higher dimensional accuracy and stability. Furthermore, especially when the second planar structure is constructed as a parallel plane, the parallel plane structure on the tubular column makes it easier to manufacture through holes with better precision control. This parallel plane structure also facilitates the placement of fasteners such as screws.

[0021] In some embodiments, the second limiting structure includes two or more second planar structures arranged circumferentially along the column, corresponding to the first planar structure of the first limiting structure. This provides more possibilities for the positional design of the corresponding second planar structures of the second limiting structure.

[0022] In some embodiments, the two or more second planar structures of the second limiting structure are evenly distributed along the circumference of the tubing. This means that the centerlines of any two adjacent second planar structures of the second limiting structure are spaced apart by the same angle along the circumference of the tubing. Thus, for example, when both the first and second limiting structures include parallel planar structures, and corresponding portions of the parallel planar structures in the second and first limiting structures need to be fastened together by fasteners, the remaining parallel planar structures of the first limiting structure without fasteners can be well supported on their corresponding parallel planar structures of the second limiting structure. Furthermore, for example, when the first limiting structure includes two or more inclined structures, this uniform arrangement of the two or more inclined structures enables good alignment of the tubing within a tubing with multiple evenly distributed second planar structures.

[0023] In some embodiments, two second planar structures are provided on the tubing column, arranged radially opposite to each other. This allows for, for example, the aforementioned good support of the parallel planar structures (where no fasteners are provided) on the corresponding second planar structures of the second limiting structures (which are constructed as parallel planar structures) when the first limiting structure includes multiple parallel planar structures, or good alignment of the tubing within the tubing column when the first limiting structure includes multiple inclined plane structures.

[0024] In some embodiments, some or all of the second planar structures in the second limiting structure are constructed as parallel planar structures, and the plane of the parallel planar structure of the second limiting structure is parallel to the central longitudinal axis of the tube column. Machining a parallel planar structure on the tube column is a relatively simple and mature process, and can achieve good shape stability and shape accuracy.

[0025] In some embodiments, part or all of the first planar structure in the first limiting structure is configured as a parallel planar structure, and the seat belt pretensioning system includes fasteners for fixing the tube body to a column in a region of the first tube body portion. The column has a through hole in a region of at least one parallel planar structure of the second limiting structure. The fastener passes through the through hole of the column and is fixedly connected to the fixing connection portion of the first tube body portion to fix the tube body to the column. Drilling holes in the parallel planar structure of the second limiting structure of the column is a mature process with good precision control and high accuracy. Furthermore, fixing the column and the first tube body portion of the tube body together with fasteners can achieve good connection and positioning accuracy.

[0026] In some embodiments, the fastener includes a screw with external threads. This allows for good connection and positioning accuracy via the screw.

[0027] In some embodiments, part or all of the second planar structure in the second limiting structure is constructed as an inclined structure, the plane of the inclined structure of the second limiting structure is inclined to the central longitudinal axis of the column, wherein the column with the inclined structure narrows towards the second tube body portion of the tube body.

[0028] In some embodiments, the inner wall of the tubular column has a basic outline of a second cross-section that is truncated to a circle in the region of the second limiting structure, and the second planar structure of the second limiting structure forms a flat portion of this basic outline of the second cross-section. This provides an advantageous second limiting structure for the tubular column.

[0029] In some embodiments, the nut of the seatbelt pretensioner secures the tubular column to the end of the second tubular portion away from the first tubular portion. This allows for tension-type fixing in conjunction with the first and second limiting structures and, if necessary, a stop flange.

[0030] A third aspect of this disclosure relates to a seatbelt pretensioning device for installation on a seat. The seatbelt pretensioning device includes a tube, a transmission element, and a pretensioning assembly. The tube is configured for installation within the seat column. The tube includes a first tube portion and a second tube portion, which are fixedly connected. The pretensioning assembly is slidably disposed within the tube. The transmission element is fixedly connected at one end to a webbing and at the other end, passing through the first tube portion and entering the tube, where it is fixedly connected to the pretensioning assembly. The seatbelt pretensioning device includes an adapter fixedly disposed at the end of the second tube portion of the tube away from the first tube portion. A third limiting structure is provided on the adapter, configured to cooperate with a fourth limiting structure on the seat column to restrict at least one degree of freedom of the tube. Thus, at least one degree of freedom of the tube within the seat column can be restricted by the adapter. Furthermore, since the adapter is located at the end of the second tube section away from the first tube section (which is essentially close to the vehicle's interior space), alignment in the middle of the tube column is not required, making operation more convenient.

[0031] In some embodiments, the third limiting structure on the adapter includes an axial limiting structure configured to cooperate with a mating axial limiting structure of the fourth limiting structure on the tubing to restrict the axial degree of freedom of the tubing. Thus, the axial degree of freedom of the tubing within the tubing can be restricted using the adapter.

[0032] In some embodiments, the axial limiting structure of the adapter is constructed as an adapter flange extending radially outward. This adapter flange is configured to stop against a mating axial limiting structure of a fourth limiting structure on the tubing to restrict the axial degree of freedom of the tubing. Thus, good axial degree of freedom restriction of the tubing can be achieved through the stopping action of the adapter flange and the mating axial limiting structure of the tubing.

[0033] In some embodiments, the third limiting structure on the adapter includes a circumferential limiting structure configured to cooperate with a paired circumferential limiting structure of the fourth limiting structure on the tubing to restrict the circumferential degree of freedom of the tubing. Thus, the circumferential degree of freedom of the tubing within the tubing can be restricted using the adapter.

[0034] In some embodiments, the third limiting structure on the adapter includes an axial limiting structure configured to mate with a mating axial limiting structure of the fourth limiting structure on the tubing, wherein the circumferential limiting structure on the adapter is disposed on the axial limiting structure of the adapter. This achieves a compact adapter design.

[0035] In some embodiments, the circumferential limiting structure on the adapter is constructed as a boss or a notch. The boss on the adapter is configured to engage with the notch on the tubing, or the notch on the adapter is configured to allow the boss on the tubing to engage. This achieves good circumferential degree of freedom restriction through the interlocking fit of the boss and the notch.

[0036] In some embodiments, the notch and / or the boss on the adapter are formed by a separate component independent of the adapter. This allows for flexible notch and / or boss configurations; for example, a boss can be implemented using a single screw.

[0037] In some embodiments, the adapter is secured to the second tube portion of the tube body by force-locking and / or form-locking. This achieves an advantageous fixed connection of the adapter to the second tube portion of the tube body.

[0038] In some embodiments, the adapter is fixed to the second portion of the pipe body via a threaded connection. This provides an advantageous, detachable, fixed connection of the adapter to the second portion of the pipe body.

[0039] In some embodiments, the seatbelt pretensioner includes an end fastener configured to secure the seat column to one end of the adapter remote from the first tube portion.

[0040] In some embodiments, the end fastener is constructed as a nut, and the adapter is configured to be secured to the column via a threaded connection structure through the nut.

[0041] The fourth aspect of this disclosure relates to a seatbelt pretensioning system, comprising a column and a seatbelt pretensioning device, wherein the seatbelt pretensioning device is the same as that of the third aspect according to one of the above embodiments, and the tube of the seatbelt pretensioning device is located inside the column; the transmission element is fixedly connected at one end to a webbing and at the other end passes through the first tube portion and enters the tube, and is fixedly connected to the pretensioning assembly, characterized in that a fourth limiting structure is provided at the end of the column away from the first tube portion, and the third limiting structure on the adapter cooperates with the fourth limiting structure on the column to restrict at least one degree of freedom of the tube. Thus, at least one degree of freedom of the tube within the column can be restricted by the adapter. Furthermore, since the adapter is located at the end of the second tube portion of the tube away from the first tube portion (this end is substantially close to the vehicle interior space), alignment in the middle of the column is not required, making operation more convenient. Since the operation is carried out on the side of the tube or column, there is no seat cover to obstruct the installation area, making it more convenient for installers to perform the installation operation, thereby improving installation efficiency and accuracy.

[0042] In some embodiments, the fourth limiting structure on the tubing includes a paired axial limiting structure. The axial limiting structure on the adapter cooperates with the paired axial limiting structure on the tubing to restrict the axial degree of freedom of the tubing. Thus, the axial degree of freedom of the tubing within the tubing can be restricted by means of the corresponding axial limiting structures on the adapter and the tubing.

[0043] In some embodiments, the mating axial limiting structure on the tubing is constructed as a constricted wall extending radially inward, with the adapter flange stopping on the constricted wall to restrict the axial degree of freedom of the tubing. Thus, good axial degree of freedom restriction of the tubing can be achieved through the stop cooperation between the adapter flange and the constricted wall.

[0044] In some embodiments, the fourth limiting structure on the tubing includes a paired circumferential limiting structure disposed at the end of the tubing away from the first tubing portion. The circumferential limiting structure on the adapter cooperates with the paired circumferential limiting structure on the tubing to restrict the circumferential degree of freedom of the tubing. Thus, the circumferential degree of freedom of the tubing within the tubing can be restricted by means of the adapter and the corresponding circumferential limiting structures on the tubing.

[0045] In some embodiments, the fourth limiting structure on the tubing includes a mating axial limiting structure, and the axial limiting structure on the adapter cooperates with the mating axial limiting structure on the tubing. The mating circumferential limiting structure on the tubing is disposed on the mating axial limiting structure of the tubing. This achieves a compact adapter design.

[0046] In some embodiments, one of the circumferential limiting structures on the adapter and the mating circumferential limiting structures on the tubing is a boss, while the other is a notch. The boss engages with the notch to restrict the circumferential degree of freedom of the tubing. This interlocking fit between the boss and the notch achieves good circumferential degree of freedom restriction.

[0047] In some embodiments, the notches and / or bosses on the tubing are formed by separate components independent of the tubing. This allows for flexible notch and / or boss arrangements; for example, a boss can be implemented using a single screw.

[0048] In some embodiments, the end fastener of the seatbelt pretensioner secures the column to the end of the adapter that is furthest from the first tube.

[0049] The fifth aspect of this disclosure relates to a seating system, characterized in that the seating system includes a seat and a seat belt pretensioner of the first aspect, or a seat belt pretensioner system of the second aspect, or a seat belt pretensioner of the third aspect, or a seat belt pretensioner system of the fourth aspect.

[0050] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0051] The present disclosure will be further described below with reference to the illustrative drawings and exemplary embodiments. Wherein:

[0052] Figure 1 A cross-sectional view of an existing seatbelt pretensioning system installed on a seat is shown.

[0053] Figure 2 An exploded view of a seat system including a seat belt pretensioner system and a seat according to a first embodiment of the present disclosure is shown.

[0054] Figure 3 Show Figure 2 A side view of a portion of the seating system.

[0055] Figure 4 A perspective view of a seatbelt pretensioner device according to a first embodiment of the present disclosure is shown.

[0056] Figure 5 Show along Figure 3 A sectional view cut by the cutting line AA.

[0057] Figure 6 A cross-sectional view of the seatbelt pretensioning system according to a first embodiment of the present disclosure is shown at the through-hole of the tube.

[0058] Figure 7 A side view of the first tube portion of the seatbelt pretensioner of the seatbelt pretensioning system according to a first embodiment of the present disclosure is shown from one perspective.

[0059] Figure 8 A side view of the first tube portion of the seatbelt pretensioner of the seatbelt pretensioning system according to a first embodiment of the present disclosure is shown from another perspective.

[0060] Figure 9 Show Figure 8 A front view of the first tube section.

[0061] Figure 10 A perspective view of a seatbelt pretensioner device according to a second embodiment of the present disclosure is shown.

[0062] Figure 11A cross-sectional view of a seatbelt pretensioning system according to a second embodiment of the present disclosure is shown.

[0063] Figure 12 A cross-sectional view of the seat belt pretensioning system according to a second embodiment of the present disclosure is shown at the second limiting structure.

[0064] Figure 13 A side view of the first tube portion of a seatbelt pretensioning system according to a second embodiment of the present disclosure is shown.

[0065] Figure 14 A perspective view of a seatbelt pretensioner device according to a third embodiment of the seatbelt pretensioning system of the present disclosure is shown.

[0066] Figure 15 A cross-sectional view of a seatbelt pretensioning system according to a third embodiment of the present disclosure is shown.

[0067] Figure 16 The diagram shows a cross-sectional view of the seatbelt pretensioning system according to a third embodiment of the present disclosure, cut at the through-hole of the tubing.

[0068] Figure 17 The image shows a side view of the first tube portion of the seatbelt pretensioner of a seatbelt pretensioning system according to a third embodiment of the present disclosure, viewed from one perspective.

[0069] Figure 18 Show Figure 17 A front view of the first tube section.

[0070] Figure 19 A side view of the first tube portion of the seatbelt pretensioner of the seatbelt pretensioning system according to a third embodiment of the present disclosure is shown from another perspective.

[0071] Figure 20 A perspective view of a seatbelt pretensioner device according to a fourth embodiment of the seatbelt pretensioning system of the present disclosure is shown.

[0072] Figure 21 Show Figure 20 An exploded view of the seatbelt pretensioner.

[0073] Figure 22 A side view of a portion of a seatbelt pretensioning system according to a fifth embodiment of the present disclosure is shown.

[0074] Figure 23 A cross-sectional view of a portion of a seatbelt pretensioning system according to a fifth embodiment of the present disclosure is shown.

[0075] Figure 24 Show along Figure 23 A sectional view cut by the cutting line AA.

[0076] Figure 25 A perspective view showing a portion of the tubing of a seatbelt pretensioning system according to a fifth embodiment of the present disclosure.

[0077] Figure 26 A perspective view of an adapter for a seatbelt pretensioning system according to a fifth embodiment of the present disclosure is shown. Detailed Implementation

[0078] The different embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0079] Firstly, by using Figures 2 to 9 A first embodiment of the seatbelt pretensioning system according to this disclosure is described. For example... Figures 2 to 9As shown, in a first embodiment of the seatbelt pretensioning system disclosed herein, the seatbelt pretensioning system includes a column 110, which may be the seat tube of the seat 100 or can be formed from the seat tube; and the seatbelt pretensioning system also includes a seatbelt pretensioning device. A seat system can be formed by the seatbelt pretensioning device or the seatbelt pretensioning system and the seat 100. In a first embodiment, the seatbelt pretensioning device includes a tube body 200, a transmission element 300, and a pretensioning assembly 400. The tube body 200 is located inside the tube column 110. The tube body 200 includes a first tube body portion 210 and a second tube body portion 220, which are fixedly connected. A first limiting structure 211 is provided on the first tube body portion 210, and a second limiting structure 111 is provided on the tube column 110. The first limiting structure 211 and the second limiting structure 111 cooperate with each other. The pretensioning assembly 400 is slidably disposed inside the tube body 200. One end of the transmission element 300 is fixedly connected to the webbing 500, and the other end passes through the first tube body portion 210 and enters the tube body 200 to be fixedly connected to the pretensioning assembly 400. The first limiting structure 211 on the first tube portion 210 includes a first planar structure 2114 configured as a parallel planar structure. Correspondingly, the second limiting structure 111 on the tube column 110 includes a second planar structure configured as a parallel planar structure. The second planar structure of the second limiting structure 111 and the first planar structure 2114 of the first limiting structure 211 cooperate with each other to restrict at least one degree of freedom of the tube 200 in the tube column 110. The plane of the parallel planar structure of the second limiting structure 111 is parallel to the central longitudinal axis of the tube column 110, while the plane of the parallel planar structure of the first limiting structure 211 is parallel to the central longitudinal axis of the tube 200. The seatbelt pretensioning system includes fasteners, preferably screws 710, for securing the tube body 200 to the post 110 in a region of the first tube body portion 210. The post 110 has a through hole 112 in a region of the parallel plane structure of the second limiting structure 111, and the first tube body portion 210 has a fixing connection portion, preferably threaded hole 213, in a region of the parallel plane structure corresponding to the parallel plane structure of the second limiting structure 111 for fixing the fasteners. The fasteners pass through the through hole 112 of the post 110 and are fixedly connected in the fixing connection portion to secure the tube body 200 to the post 110. Of course, other forms of fasteners and fixing connections besides screws 710 and threaded holes 213 are also conceivable. In addition, the seatbelt pretensioning device includes a nut 700, which secures the post 110 and the end of the second tube body portion 220 away from the first tube body portion 210 together.

[0080] When a collision occurs, the pretensioning assembly 400 will be triggered and move in the tube 200 away from the first tube portion 210. It will also move with the webbing 500 through the transmission element 300. Even if the webbing 500 enters the tube column 110 and moves in the tube column 110 towards the first tube portion 210, the webbing 500 will be tightened, thus playing a pretensioning role, preventing the occupants from falling and reducing the injury to the occupants in the collision.

[0081] In the first embodiment, during installation, the circumferential degree of freedom of the tube body 200 can be effectively restricted by the matching limiting structure between the first tube body portion 210 and the tube post 110. This eliminates the need for installers to constantly rotate circumferentially to find the screw-in hole; by moving the tube body 200 axially along the tube post 110, the screw-in fixing connection on the tube body 200 can be quickly located, thus achieving rapid fixing and installation of the tube body 200 on the tube post 110. Positioning and fixing with screws 710 achieves high positioning accuracy. Furthermore, forming the parallel plane structure and through hole 112 on the tube post 110 simplifies the manufacturing process. The parallel plane structure allows for particularly good shape stability and shape accuracy of the second limiting structure 111 of the tube post 110.

[0082] In addition to the first planar structure 2114, the first limiting structure 211 of the first tube body portion 210 may also include teeth 2112 and grooves 2113. The structural design of teeth 2112 and grooves 2113 can be referred to the corresponding description in CN223174091U.

[0083] In the first embodiment, as Figures 6 to 9 As can be clearly seen, the inner wall of the tube column 110 has a basic outline of a second cross-section that is truncated to a circle in the region of the second limiting structure 111. The second limiting structure 111 is constructed as a second planar structure with parallel planes forming the flat portion of this basic outline of the second cross-section. The periphery of the first tube body portion 210 has a basic outline of a first cross-section that is truncated to a circle in the region of the first limiting structure 211. The first planar structure 2114 of the first limiting structure 211 forms the flat portion of this basic outline of the first cross-section. Here, the basic outline of the cross-section can be understood as the basic outline excluding the teeth and grooves, or in other words, the basic outline without considering the teeth and grooves.

[0084] In addition to the arrangement in the first embodiment, in another embodiment, it is conceivable to omit the fasteners and the corresponding through holes 112, and instead provide a stop flange 214 at the end of the first tube portion 210 away from the second tube portion 220. Here, the axial degree of freedom of the first tube portion 210 of the tube body 200 can be restricted by the stop flange 214 in conjunction with the parallel planar structure of the second limiting structure 111.

[0085] Then, with the help of Figures 10 to 13 A second embodiment of the seatbelt pretensioning system according to the present disclosure is described.

[0086] The second embodiment differs from the first embodiment in that the second limiting structure 111 includes two second planar structures with parallel planar structures arranged circumferentially along the column 110, and these two parallel planar structures are radially opposite each other. Correspondingly, the first limiting structure 211 includes two first planar structures 2114 with inclined plane structures arranged circumferentially along the first tube portion 210, corresponding to the parallel planar structures of the second limiting structure 111, and these two inclined plane structures are also radially opposite each other; the plane of the inclined plane structure of the first limiting structure 211 is inclined to the central longitudinal axis of the tube 200, wherein the first tube portion 210 with the inclined plane structure narrows towards the second tube portion 220. Furthermore, in the second embodiment, since two opposing first planar structures 2114 with inclined plane structures are provided, these inclined plane structures can cooperate with the two opposing parallel planar structures of the second limiting structure 111 to simultaneously achieve axial and circumferential degree of freedom restriction of the tube 200 in the column 110 when tensioned and fixed. In the second embodiment, the two opposing inclined surfaces of the first limiting structure 211 enable good alignment of the tube 200 within the tube column 110. Furthermore, the inclined surfaces automatically eliminate installation gaps during the fixing (e.g., tension fixing) of the tube 200, preventing noise caused by gaps. In the second embodiment, additional fasteners are not required to fix the first tube portion 210. However, for redundancy, a stop flange 214 is provided at the end of the first tube portion 210 away from the second tube portion 220 in the second embodiment to provide axial freedom restriction for the tube 200 when necessary. Other aspects can be referred to the description of the first embodiment. In the second embodiment, the parallel planar structure of the second limiting structure 111 and the inclined surface structure of the first limiting structure 211 simultaneously restrict both the axial and circumferential degrees of freedom of the first tube portion 210. Additionally, the stop flange 214 on the first tube portion 210 further restricts the axial degree of freedom of the first tube portion 210. In addition, in the second embodiment, it is not necessary to screw in the screws 710 for positioning, which reduces the number of assembly steps, lowers the manufacturing cost, and makes installation more convenient.

[0087] Besides the arrangement in the second embodiment, in another embodiment, it is conceivable that the second limiting structure 111 may include two or more parallel planar structures arranged circumferentially along the column 110. Correspondingly, the first limiting structure 211 includes two or more first planar structures 2114, corresponding to the parallel planar structures of the second limiting structure 111, arranged circumferentially along the first tube portion 210. Here, the axial degree of freedom of the first tube portion 210 is limited only by the stop flange 214 on the first tube portion 210. Furthermore, in another embodiment, it is conceivable that the first limiting structure 211 includes two or more inclined structures preferably evenly distributed circumferentially along the column 110, through which the centering of the tube 200 can also be achieved. In another embodiment, it is conceivable that some of the first planar structures 2114 in the first limiting structure 211 are inclined structures, while the remaining first planar structures 2114 are parallel planar structures. In other embodiments not shown, it is also conceivable that, instead of a parallel planar structure, part or all of the second planar structure of the second limiting structure 111 may be constructed as an inclined structure. In this case, the corresponding first planar structure 2114 in the first limiting structure 211 may be constructed as an inclined structure, or it may be constructed as a parallel planar structure. In this disclosure, when the inclined structure and the parallel planar structure are engaged, an interference fit occurs between them due to a tightening and fixing process (e.g., caused by tightening a nut).

[0088] Then with Figures 14 to 19 A third embodiment of the seatbelt pretensioning system according to this disclosure is described.

[0089] The third embodiment differs from the first embodiment in that the second limiting structure 111 includes two second planar structures with parallel planar configurations arranged circumferentially along the column 110, and these two parallel planar structures of the second limiting structure 111 are radially opposite to each other. Correspondingly, the first limiting structure 211 includes two first planar structures 2114 with parallel planar configurations arranged circumferentially along the first tube portion 210, corresponding to the parallel planar structures of the second limiting structure 111, and these two parallel planar structures of the first limiting structure 211 are also radially opposite to each other. A through hole 112 is provided in the region of one of the parallel planar structures of the second limiting structure 111, and a fixing connection portion with a threaded hole 213 is also provided in the region of one corresponding parallel planar structure of the first tube portion 210. In addition, fasteners with a screw 710 configuration are also provided for fixing. For other aspects, please refer to the description of the first embodiment. In the third embodiment, the parallel planar structure assembly without fasteners can serve as a support structure for the opposite portion where fasteners are to be installed during the fastening process, which allows for better control of the fastening process. Other advantages can be found in the description of the first embodiment.

[0090] Next, using Figure 20 and Figure 21 A fourth embodiment of the seatbelt pretensioning system according to this disclosure is described.

[0091] The fourth embodiment differs from the first embodiment in that the seatbelt pretensioning device includes a hollow insert, which can be configured as a sleeve 800; a first limiting structure 211 is formed on the outside of the insert, the insert is sleeved on the outside of the first tube portion 210 and fixedly connected to the first tube portion 210, wherein the first tube portion 210 has a non-cylindrical structure, and the inner wall shape of the insert matches the outer shape of the first tube portion 210. Reference can also be made to the description of the first embodiment in other aspects. Of course, the first limiting structure 211 on the insert and related structures can also adopt the corresponding structures in the second or third embodiment or other embodiments improved in this disclosure.

[0092] Finally, by using Figures 22 to 26 A fifth embodiment of the seatbelt pretensioning system according to this disclosure is described.

[0093] In the fifth embodiment, the seat belt pretensioning system includes a column 110, and further includes a tube body 200, a transmission element 300, and a pretensioning assembly 400. The tube body 200 is located inside the column 110, and includes a first tube body portion 210 and a second tube body portion 220, which are fixedly connected. The pretensioning assembly 400 is slidably disposed inside the tube body 200. One end of the transmission element 300 is fixedly connected to a webbing 500, and the other end passes through the first tube body portion 210 and enters the tube body 200 to be fixedly connected to the pretensioning assembly 400. The seat belt pretensioning system includes an adapter 720, which is fixedly disposed at the end of the second tube body portion 220 of the tube body 200 away from the first tube body portion 210. A third limiting structure, including an axial limiting structure 721, is provided on the adapter 720; and a fourth limiting structure, including a mating axial limiting structure 113, is provided at the end of the tubing 110 away from the first tubing portion 210. The axial limiting structure 721 of the adapter 720 and the mating axial limiting structure 113 of the tubing 110 cooperate to restrict the axial degree of freedom of the tubing 200. The axial limiting structure 721 of the adapter 720 is constructed as an adapter flange extending radially outward, while the mating axial limiting structure 113 of the tubing 110 is constructed as a constricted wall extending radially inward. The adapter flange stops against the constricted wall to restrict the axial degree of freedom of the tubing 200. Furthermore, the third limiting structure on the adapter 720 includes a circumferential limiting structure 722, and the fourth limiting structure on the tubing 110 includes a paired circumferential limiting structure 114 disposed at the end of the tubing 110 away from the first tubing portion 210. The circumferential limiting structure 722 on the adapter 720 cooperates with the paired circumferential limiting structure 114 on the tubing 110 to restrict the circumferential degree of freedom of the tubing 200. The circumferential limiting structure 722 on the adapter 720 is disposed on the axial limiting structure 721 of the adapter 720, while the paired circumferential limiting structure 114 on the tubing 110 is disposed on the paired axial limiting structure 113 of the tubing 110. The circumferential limiting structure 722 on the adapter 720 is constructed as an integrally formed boss, while the paired circumferential limiting structure 114 on the tubing 110 is constructed as a notch, and the boss engages into the notch to restrict the circumferential degree of freedom of the tubing 200. Of course, in another embodiment, it is also conceivable that the mating circumferential limiting structure 114 on the column 110 is constructed as a boss, while the circumferential limiting structure 722 on the adapter 720 is constructed as a notch. Furthermore, in another embodiment, it is also conceivable that the notch and / or the boss are formed by separate components independent of the adapter 720 and / or the column 110. For example, the boss can be implemented by a separate screw or pin.As shown in the figure, the adapter 720 is fixed to the second tube portion 220 of the tube body 200 by a threaded connection structure. The seat belt pretensioning device includes an end fastener configured as a nut 700, which secures the tube column 110 to the end of the adapter 720 away from the first tube portion 210 by a threaded connection structure.

[0094] In addition to the arrangement in the fifth embodiment, it is also conceivable that the third limiting structure on the adapter and the fourth limiting structure on the column may each include only the corresponding axial limiting structure or only the corresponding circumferential limiting structure. These axial or circumferential limiting structures can work together with other limiting structures in the seat belt pretensioning system to restrict more degrees of freedom.

[0095] It should be noted that the terminology used herein is for illustrative purposes only and is not intended to limit the disclosure. The singular forms “a” and “the one” as used herein should include the plural forms unless the context explicitly states otherwise. It is understood that the terms “comprising” and “including,” and other similar terms, when used in the application documents, specifically describe the presence of the stated operation, element, and / or component, without excluding the presence or addition of one or more other operations, elements, components, and / or combinations thereof. The term “and / or” as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, similar reference numerals always denote similar elements.

[0096] The thickness of the elements in the accompanying drawings may be exaggerated for clarity. It is also understood that if an element is described as being on, coupled to, or connected to another element, then the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intermediate elements between them. Conversely, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, it indicates that there is no intermediate element. Other terms used to describe relationships between elements should be interpreted similarly, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0097] Terms such as “top,” “bottom,” “above,” “below,” “over,” “under,” etc., are used to describe the relationship of one element, layer, or region relative to another element, layer, or region, as shown in the accompanying drawings. It is understood that these terms should also encompass other orientations of the device in addition to those described in the accompanying drawings.

[0098] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Thus, a first element may be referred to as a second element without departing from the teachings of this disclosure.

[0099] It can also be considered that all the exemplary embodiments disclosed herein can be arbitrarily combined with each other. Furthermore, all individual technical features in this application can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All technically feasible combinations of features are the technical content described in this application.

[0100] Finally, it should be noted that the above embodiments are merely for understanding this disclosure and do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art can make modifications based on the above embodiments, and these modifications will not depart from the scope of protection of this disclosure.

Claims

1. A seatbelt pretensioning device for installation on a seat, the seatbelt pretensioning device comprising a tube body, a transmission element, and a pretensioning assembly, the tube body being configured for installation within a seat column, the tube body comprising a first tube body portion and a second tube body portion fixedly connected, the first tube body portion having a first limiting structure configured to cooperate with a second limiting structure on the seat column; the pretensioning assembly being slidably disposed within the tube body, the transmission element being capable of being fixedly connected at one end to a webbing and having the other end passing through the first tube body portion and entering the tube body and fixedly connected to the pretensioning assembly. Its features are, The first limiting structure on the first tube portion includes a first planar structure, the first planar structure of the first limiting structure being configured to cooperate with the second planar structure of the second limiting structure to restrict at least one degree of freedom of the tube in the column.

2. The seat belt pretensioning device according to claim 1, characterized in that, The first limiting structure includes two or more first planar structures arranged circumferentially along the first tube portion.

3. The seat belt pretensioning device according to claim 2, characterized in that, The two or more first planar structures of the first limiting structure are evenly distributed along the circumference of the first tube portion.

4. The seat belt pretensioning device according to claim 3, characterized in that, Two first planar structures are provided on the first tube body portion and are arranged radially opposite each other.

5. The seat belt pretensioning device according to any one of claims 1 to 4, characterized in that, Some or all of the first planar structures in the first limiting structure are constructed as parallel planar structures, and the plane of the parallel planar structure of the first limiting structure is parallel to the central longitudinal axis of the tube.

6. The seat belt pretensioning device according to claim 5, characterized in that, The first tube portion has a fixed connection portion in at least one region of a parallel planar structure, the fixed connection portion being used for the fixed connection of fasteners.

7. The seat belt pretensioning device according to claim 6, characterized in that, The fixed connection includes a threaded hole and has internal threads.

8. The seat belt pretensioning device according to any one of claims 2 to 4, characterized in that, The first limiting structure may be partially or entirely constructed as a sloping structure. The plane of the sloping structure of the first limiting structure is inclined to the central longitudinal axis of the tube body. The first tube body portion with the sloping structure narrows towards the second tube body portion.

9. The seat belt pretensioning device according to any one of claims 1 to 4, characterized in that, A stop flange is provided at the end of the first tube portion that is away from the second tube portion.

10. The seatbelt pretensioning device according to any one of claims 1 to 4, characterized in that, The seat belt pretensioning device includes a hollow insert, a first limiting structure formed on the outside of the insert, the insert being fitted onto the outside of a first tube portion and fixedly connected to the first tube portion, wherein the first tube portion has a non-cylindrical structure, and the inner wall shape of the insert matches the outer shape of the first tube portion.

11. The seatbelt pretensioning device according to any one of claims 1 to 4, characterized in that, The periphery of the first tube portion has a basic outline of a first cross-section that is truncated to a circle in the region of the first limiting structure, and the first planar structure of the first limiting structure forms a flat portion of the basic outline of the first cross-section that is truncated to a circle.

12. The seatbelt pretensioning device according to any one of claims 1 to 4, characterized in that, The seatbelt pretensioner includes a nut configured to secure the seat column to one end of the second tube portion away from the first tube portion.

13. A seatbelt pretensioning system, the seatbelt pretensioning system comprising a tubular column and a seatbelt pretensioning device, wherein, The seat belt pretensioning device is a seat belt pretensioning device according to any one of claims 1 to 12, wherein the tube body of the seat belt pretensioning device is located inside the tube column, and a second limiting structure is provided on the tube column, and the first limiting structure and the second limiting structure of the seat belt pretensioning device cooperate with each other; the transmission element is fixedly connected to the webbing at one end and passes through the first tube body portion and enters the tube body at the other end and is fixedly connected to the pretensioning assembly. The feature is that the second limiting structure on the column includes an inwardly recessed second planar structure, and the second planar structure of the second limiting structure of the column cooperates with the first planar structure of the first limiting structure of the seat belt pretensioning device to restrict at least one degree of freedom of the tube body in the column.

14. The seatbelt pretensioning system according to claim 13, characterized in that, The second limiting structure includes two or more second planar structures that are arranged along the circumference of the tubular column and correspond to the first planar structure of the first limiting structure.

15. The seatbelt pretensioning system according to claim 14, characterized in that, The two or more second planar structures of the second limiting structure are evenly distributed along the circumference of the column.

16. The seatbelt pretensioning system according to claim 15, characterized in that, Two second planar structures are arranged radially opposite each other on the tubular column.

17. The seatbelt pretensioning system according to any one of claims 13 to 16, characterized in that, The second limiting structure may contain part or all of the second planar structure, which is constructed as a parallel planar structure, and the plane of the parallel planar structure of the second limiting structure is parallel to the central longitudinal axis of the tube column.

18. The seatbelt pretensioning system according to claim 17, characterized in that, The first limiting structure has some or all of the first planar structure configured as a parallel planar structure, and the seat belt pretensioning system includes fasteners for fixing the tube body to the column in the region of the first tube body portion. The column has a through hole in the region of at least one parallel planar structure of the second limiting structure. The fastener passes through the through hole of the column and is fixedly connected in the fixed connection portion of the first tube body portion to fix the tube body to the column.

19. The seatbelt pretensioning system according to claim 18, characterized in that, The fasteners include screws and have external threads.

20. The seatbelt pretensioning system according to any one of claims 14 to 16, characterized in that, The second limiting structure may be partially or entirely constructed as a sloping structure. The plane of the sloping structure of the second limiting structure is inclined to the central longitudinal axis of the column. The column with the sloping structure narrows towards the second part of the tube body.

21. The seatbelt pretensioning system according to any one of claims 13 to 16, characterized in that, The inner wall of the tubular column has a basic outline of a second cross-section that is truncated to a circle in the region of the second limiting structure, and the second planar structure of the second limiting structure forms the flat portion of the basic outline of the second cross-section that is truncated to a circle.

22. The seatbelt pretensioning system according to any one of claims 13 to 16, characterized in that, The nut of the seat belt pretensioner secures the tubular column to the end of the second tubular portion away from the first tubular portion.

23. A seatbelt pretensioner for installation on a seat, the seatbelt pretensioner comprising a tube, a transmission element, and a pretensioning assembly, the tube being configured for installation within a seat column, the tube comprising a first tube portion and a second tube portion fixedly connected; the pretensioning assembly being slidably disposed within the tube, the transmission element being capable of being fixedly connected at one end to a webbing and at the other end passing through the first tube portion and entering the tube and fixedly connected to the pretensioning assembly. Its features are, The seat belt pretensioning device includes an adapter fixedly disposed at the end of the second tube portion of the tube body away from the first tube portion; a third limiting structure is provided on the adapter, the third limiting structure on the adapter being configured to cooperate with a fourth limiting structure on the tube column to restrict at least one degree of freedom of the tube body.

24. The seatbelt pretensioning device according to claim 23, characterized in that, The third limiting structure on the adapter includes an axial limiting structure, which is configured to cooperate with the paired axial limiting structure of the fourth limiting structure on the tubing to restrict the axial degree of freedom of the tubing.

25. The seatbelt pretensioning device according to claim 24, characterized in that, The axial limiting structure on the adapter is constructed as an adapter flange extending radially outward. The adapter flange is configured to stop on the paired axial limiting structure of the fourth limiting structure on the tubing to limit the axial degree of freedom of the tubing.

26. The seatbelt pretensioning device according to any one of claims 23 to 25, characterized in that, The third limiting structure on the adapter includes a circumferential limiting structure, which is configured to cooperate with the paired circumferential limiting structure of the fourth limiting structure on the tubing to restrict the circumferential degree of freedom of the tubing.

27. The seatbelt pretensioning device according to claim 26, characterized in that, The third limiting structure on the adapter includes an axial limiting structure, which is configured to cooperate with the matching axial limiting structure of the fourth limiting structure on the tubing. The circumferential limiting structure on the adapter is disposed on the axial limiting structure of the adapter.

28. The seatbelt pretensioning device according to claim 26, characterized in that, The circumferential limiting structure on the adapter is constructed as a boss or a notch. The boss on the adapter is configured to engage with the notch on the tubing, or the notch on the adapter is configured to allow the boss on the tubing to engage.

29. The seatbelt pretensioning device according to claim 28, characterized in that, The notch and / or the boss on the adapter are formed by a separate component independent of the adapter.

30. The seatbelt pretensioning device according to claim 23, characterized in that, The adapter is fixed to the second tube body portion of the tube body by force locking and / or shape locking.

31. The seatbelt pretensioning device according to claim 30, characterized in that, The adapter is fixed to the second part of the pipe body via a threaded connection structure.

32. The seatbelt pretensioning device according to claim 23, characterized in that, The seatbelt pretensioner includes an end fastener configured to secure the seat column to one end of the adapter remote from the first tube portion.

33. The seatbelt pretensioning device according to claim 32, characterized in that, The end fastener is constructed as a nut, and the adapter is configured to be fixed to the column via a threaded connection structure through the nut.

34. A seatbelt pretensioning system, the seatbelt pretensioning system comprising a tubular column and a seatbelt pretensioning device, wherein, The seat belt pretensioning device is the same as any one of claims 23 to 33, wherein the tube body of the seat belt pretensioning device is located inside a column; the transmission element is fixedly connected at one end to the webbing and at the other end passes through the first tube body portion and enters the tube body, and is fixedly connected to the pretensioning assembly. The feature is that a fourth limiting structure is provided at the end of the tubing that is away from the first tubing body, and the third limiting structure on the adapter cooperates with the fourth limiting structure on the tubing body to restrict at least one degree of freedom of the tubing body.

35. The seatbelt pretensioning system according to claim 34, characterized in that, The fourth limiting structure on the tubing includes a paired axial limiting structure. The axial limiting structure on the adapter cooperates with the paired axial limiting structure on the tubing to restrict the axial degree of freedom of the tubing.

36. The seatbelt pretensioning system according to claim 35, characterized in that, The paired axial limiting structure on the tubing is constructed as a constricted wall extending radially inward, and the adapter flange stops on the constricted wall to restrict the axial degree of freedom of the tubing.

37. The seatbelt pretensioning system according to any one of claims 34 to 36, characterized in that, The fourth limiting structure on the tubing includes a paired circumferential limiting structure provided at the end of the tubing away from the first tubing section. The circumferential limiting structure on the adapter cooperates with the paired circumferential limiting structure on the tubing to restrict the circumferential degree of freedom of the tubing.

38. The seatbelt pretensioning system according to claim 37, characterized in that, The fourth limiting structure on the tubing includes a paired axial limiting structure. The axial limiting structure on the adapter cooperates with the paired axial limiting structure on the tubing. The paired circumferential limiting structure on the tubing is set on the paired axial limiting structure of the tubing.

39. The seatbelt pretensioning system according to claim 37, characterized in that, One of the circumferential limiting structures on the adapter and the paired circumferential limiting structures on the tubing is a boss, while the other of the circumferential limiting structures on the adapter and the paired circumferential limiting structures on the tubing is a notch. The boss engages with the notch to restrict the circumferential degree of freedom of the tubing.

40. The seatbelt pretensioning system according to claim 39, characterized in that, The notches and / or bosses on the tubing are formed by separate components independent of the tubing.

41. The seatbelt pretensioning system according to claim 34, characterized in that, The end fastener of the seat belt pretensioner secures the tube column to the end of the adapter that is furthest from the first tube body.

42. A seating system, characterized in that, The seating system includes a seat and a seat belt pretensioner according to any one of claims 1 to 12, or a seat belt pretensioner system according to any one of claims 13 to 22, or a seat belt pretensioner according to any one of claims 23 to 33, or a seat belt pretensioner system according to any one of claims 34 to 41.

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