A seat belt pretensioner assembly and a vehicle seat

Abstract

The present application provides a seat belt pretensioner assembly and a vehicle seat. The seat belt pretensioner assembly includes a pretensioner body, a tension cable and a guide tube. The pretensioner body is fixed in a column of the vehicle seat. The pretensioner body is actuated to move a tab and a webbing in the direction of the pretensioner body through the tension cable. The guide tube is fixed in the column. An outer profile wall of the guide tube at least partially conforms to an inner wall of the column. An inner profile wall of the guide tube at least partially forms an axial passage. The axial passage is configured to maintain the tab at a predetermined radial position before the pretensioner body is actuated and to guide the movement of the tab after the pretensioner body is actuated. The guide tube and its structure design improve the support stability of the seat belt pretensioner assembly in the column of the vehicle seat, significantly improve the assembly efficiency and structural reliability, and effectively reduce the assembly gap, thereby eliminating the abnormal noise generated when the vehicle is vibrating.

Description

Technical Field

[0001] This invention relates to the field of vehicle safety technology, specifically to a seatbelt pretensioner assembly and a vehicle seat. Background Technology

[0002] A lumbar pretensioner is a device used in vehicle safety systems. Its main function is to reduce the gap between the occupant and the seat belt by quickly tightening the seat belt webbing when a collision occurs, thereby more effectively securing the occupant to the seat and reducing the injury caused by the collision.

[0003] Existing technologies suffer from problems such as assembly gaps between the lumbar pretensioner assembly and the seat transverse column, vehicle vibration and abnormal noise, insufficient load-bearing capacity of the guide end, and insufficient assembly and fixing reliability. Summary of the Invention

[0004] To overcome the above problems, this invention provides a seat belt pretensioner assembly and a vehicle seat. Through the design of the guide tube and its structure, the support stability of the seat belt pretensioner assembly within the vehicle seat column is improved, allowing the assembly to be stably mounted within the seat column. This significantly improves assembly efficiency and structural reliability, and effectively reduces assembly gaps, thereby eliminating abnormal noises generated during vehicle vibration. Furthermore, the guide tube also has a guiding function, providing movement guidance for the webbing after the pretensioner body is actuated, preventing friction between the webbing and the opening of the column where the seat belt pretensioner assembly is located, thus avoiding damage to the webbing.

[0005] The present invention achieves the above-mentioned technical objectives through the following technical solutions: This invention provides a seatbelt pretensioner assembly, including a pretensioner body and a tensioning cable. The pretensioner body is fixed inside the column of a vehicle seat. One end of the tensioning cable is connected to the webbing via an end piece, and the other end is connected to the pretensioner body. When the pretensioner body is actuated, the tensioning cable can drive the end piece and the webbing to move toward the pretensioner body. The seatbelt pretensioner assembly also includes a guide tube. The guide tube is fixed in the column, and the outer contour wall of the guide tube at least partially abuts against the inner wall of the column. The inner contour wall of the guide tube at least partially forms an axial channel. The axial channel is configured to hold the end piece in a predetermined radial position before the pretensioner body is actuated and to provide guidance for the movement of the end piece after the pretensioner body is actuated.

[0006] Preferably, the guide tube includes an annular body and at least two extension arms; the annular body is disposed near a first opening of the tube column; the axial channel is formed inside the annular body; each of the extension arms is disposed in the tube column and is respectively connected to the annular body; the pretensioner body includes a pretensioning tube and a bracket disposed at the end of the pretensioning tube, and the ends of each of the extension arms are clamped on the bracket.

[0007] More preferably, the bracket includes a perforation and annular protrusions protruding to both sides around the perforation, and the end of the extension arm is provided with a sleeve structure, which is sleeved around the outer periphery of the annular protrusions.

[0008] More preferably, the seat belt pretensioner assembly further includes a stop washer, which is engaged with the outer periphery of any of the annular protrusions and disposed on the outside of the sleeve structure to restrict the movement of the sleeve structure away from the bracket.

[0009] More preferably, the first end of the annular body extends outward toward the first opening of the tube column to form a flared structure, the outer diameter of the flared structure being larger than the diameter of the tube column; the seat belt pretensioner assembly further includes a flange ring, the flange ring being sleeved on the annular body and extending at least partially between the first opening of the tube column and the flared structure.

[0010] More preferably, the seat belt pretensioner assembly further includes a support ring having an axial opening, the axial opening allowing the support ring to be laterally engaged with the annular body under its own elastic deformation, the support ring surrounding and being fixed around the annular body, and the first end of the support ring abutting against the flange ring.

[0011] More preferably, the inner wall of the support ring is provided with a buckle, which cooperates with a groove provided on the annular body so that the support ring is at least partially fitted onto the surface of the annular body and forms a snap-fit ​​structure with the annular body to restrict the axial movement of the support ring.

[0012] More preferably, the annular body has a stepped protrusion, and the end of the support ring abuts against the end face of the stepped protrusion.

[0013] More preferably, the outer contour wall of the guide tube is formed by intersecting ribs connected together, and the outer ends of the ribs are used to fit against the inner wall of the tube column.

[0014] Preferably, the end piece is a plate-like structure with through holes, and the webbing is fixed through the through holes; the longitudinal section of the axial channel includes a wide portion in the middle and narrow portions on both sides; before the pretensioner body is actuated, the two ends of the plate-like structure are located in the narrow portions, and the middle portion of the webbing and the plate-like structure is located in the wide portion.

[0015] More preferably, the seat belt pretensioner assembly further includes a support sleeve, which is disposed on the pretension tube body and located at the second opening of the tube column; the outer periphery of the support sleeve is provided with at least one rib, which is configured to form an elastic interference fit with the inner wall of the tube column to support the pretension tube body and eliminate the assembly gap between the pretension tube body and the tube column.

[0016] More preferably, the support sleeve is provided with an eccentric hole, and the pretensioning tube is disposed in the eccentric hole; the support sleeve also has at least one outer contour section to fix the position of the pretensioner body during the actuation process.

[0017] More preferably, the ribs in the support sleeve satisfy at least one of the following conditions: The number of protruding ribs is selected according to the length and outer diameter of the support sleeve; The height of the rib is configured such that the rib has an appropriate interference fit with the inner wall of the column, and does not hinder the installation of the seat belt pretensioner assembly into the column. The rib is an annular rib that extends continuously along the outer periphery of the support sleeve, or the rib is a segmented rib that is spaced apart along the outer periphery of the support sleeve. The rib is configured to elastically deform upon insertion into the tubing to absorb radial tolerances between the seatbelt pretensioner assembly and the tubing.

[0018] The present invention also provides a vehicle seat, which includes a seat body and a seat belt pretensioner assembly as described above; the seat belt pretensioner assembly is fixedly installed in the column of the seat body.

[0019] Preferably, the seat belt pretensioner assembly includes a pretensioning tube and a bracket. The bracket includes a through hole and a welded nut located on one side of the bracket and surrounding the through hole. An inner washer is also provided on the other side of the bracket. The tube column has an opening. A bolt is passed through the opening and the inner washer in sequence and then fastened to the welded nut to fix the seat belt pretensioner assembly in the tube column.

[0020] More preferably, the tubular column has a partially planar end, and the opening is located at the planar end.

[0021] Compared with the prior art, the beneficial effects that the at least one technical solution adopted by the present invention can achieve include at least the following: Through the design of the guide tube and its structure, the support stability of the seat belt pretensioner assembly within the vehicle seat column is improved. This allows the seat belt pretensioner assembly to be stably assembled within the vehicle seat column, significantly improving assembly efficiency and structural reliability. It also effectively reduces assembly gaps, thereby eliminating abnormal noises generated during vehicle vibration. In addition, the guide tube also has a guiding function, providing movement guidance for the webbing after the pretensioner body is actuated, preventing the webbing from rubbing against the tube opening of the column where the seat belt pretensioner assembly is located, thus avoiding damage to the webbing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 An exploded structural diagram of a seatbelt pretensioner assembly provided in an embodiment of this application; Figure 2 A schematic diagram of the assembly structure of a seat belt pretensioner assembly provided in an embodiment of this application; Figure 3 A cross-sectional view of a seatbelt pretensioner assembly provided in an embodiment of this application; Figure 4 A three-dimensional view of the bottom surface of a seat belt pretensioner assembly provided in an embodiment of this application; Figure 5 This is a cross-sectional view of a seatbelt pretensioner assembly provided in an embodiment of this application at the first port of the tube column; Figure 6 A schematic diagram of the annular body of the guide tube in a seat belt pretensioner assembly provided in an embodiment of this application; Figure 7 This is a schematic diagram of the support ring in a seat belt pretensioner assembly provided in an embodiment of this application; Figure 8 A schematic diagram of the axial channel of the guide tube in a seat belt pretensioner assembly provided in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of the support sleeve in a seat belt pretensioner assembly provided in an embodiment of this application; Figure 10 This is a structural schematic diagram of a vehicle seat provided in one embodiment of this application; Figure 11This is a schematic diagram of the assembly of a seatbelt pretensioner in a vehicle seat according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: Seat belt pretensioner assembly 1; pretensioner body 101; pretensioner tube 1011; bracket 1012; through hole 10121; inner washer 10122; welding nut 10123; tensioning cable 102; guide tube 103; annular body 1031; first end of annular body 10311; second end of annular body 10312; slot 10313; stepped protrusion 10314; first extension arm 1032; second extension arm 1033; sleeve structure 1034; horn 1035; rib 1036; axial channel 1037; wide section 10371; narrow section 10372; stop washer 104; flange ring 105; support ring 106; axial opening 1061; snap fastener 1062; support sleeve 107; protruding rib 1071; eccentric hole 1072; outer contour section 1073; end piece 2; through hole 201; webbing 3; tube column 4; first tube opening 401; second tube opening 402; opening 403; bolt 5; seat body 6. Detailed Implementation

[0025] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0026] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0030] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 11 As shown in the embodiment of this specification, a seat belt pretensioner assembly 1 is disclosed, which includes a pretensioner body 101 and a tensioning cable 102. The pretensioner body 101 is fixed inside the tube column 4 of the vehicle seat. One end of the tensioning cable 102 is connected to the webbing 3 through an end piece 2, and the other end is connected to the pretensioner body 101. When the pretensioner body 101 is actuated, the tensioning cable 102 can drive the end piece 2 and the webbing 3 to move towards the pretensioner body 101. When a vehicle collision occurs, the pretensioner body 101 generates a large tension on the tensioning cable 102, causing the tensioning cable 102, which is connected to the end piece 2 and the webbing 3, to move rapidly towards the pretensioner body 101, thereby achieving the effect of quickly tightening the webbing 3, thereby reducing the gap between the occupant and the seat belt, more effectively fixing the occupant to the seat, and reducing the injury caused to the occupant by the collision. However, there is an assembly gap between the aforementioned seat belt pretensioner assembly 1 and the column 4 on the vehicle seat, which can cause abnormal noises when the vehicle vibrates, and the column is prone to deformation due to insufficient load-bearing capacity.

[0032] The inventor proposed the following solution: Figure 1 and Figure 3As shown in the embodiments of this specification, a seat belt pretensioner assembly 1 is disclosed. The seat belt pretensioner assembly 1 also includes a guide tube 103. The guide tube 103 is fixed in the column 4. The outer contour wall of the guide tube 103 is at least partially attached to the inner wall of the column 4. The inner contour wall of the guide tube 103 at least partially forms an axial channel 1037. The axial channel 1037 is configured to hold the end piece 2 in a predetermined radial position before the pretensioner body 101 is actuated, and to provide guidance for the movement of the end piece 2 after the pretensioner body 101 is actuated.

[0033] The guide tube 103 serves as a guide for the tension cable 102, end piece 2, and webbing 3, and also as a support for the seat belt pretensioner assembly 1 within the tube post 4. By designing the guide tube 103 in the seat belt pretensioner assembly 1, the gaps inside the tube post 4 can be effectively filled, increasing the load-bearing capacity inside the tube post. Furthermore, the axial channel 1037 in the guide tube 103 can restrict radial displacement of the end piece 2 and webbing 3. In addition, when the pretensioner body 101 is actuated, the guide tube 103 can provide motion guidance for the end piece 2 and webbing 3. This ensures that the webbing never comes into contact with the tube opening of the tube post 4 before or after actuation, thus preventing damage to it.

[0034] like Figure 1 and Figure 2 As shown, in some embodiments, the guide tube 103 includes an annular body 1031 and two extension arms; wherein, the annular body 1031 is disposed near the first port 401 of the tube column 4; an axial channel 1037 is formed inside the annular body 1031; the two extension arms are a first extension arm 1032 and a second extension arm 1033; the first extension arm 1032 and the second extension arm 1033 are disposed in the tube column 4 and are respectively connected to the annular body 1031; the pretensioner body 101 includes a pretension tube 1011 and a bracket 1012 disposed at the end of the pretension tube 1011, and the ends of the first extension arm 1032 and the second extension arm 1033 are both clamped on the bracket 1012. By clamping the two extension arms to the bracket 1012, the guide tube 103 and the pretensioner body 101 form a fixed structure. Even when the pretensioner body 101 generates a large tension, this fixed structure can keep the guide tube 103 in a fixed position and prevent it from moving toward the pretensioner body 101 due to the tension of the pretensioner body 101.

[0035] It is understood that the cross-section of the first extension arm 1032 and the second extension arm 1033 can be a semi-circular structure or an arched structure, and the first extension arm 1032 and the second extension arm 1033 are arranged vertically at the end or middle rear end of the annular body 1031. The two extension arms and the annular body 1031 can be spliced ​​together or integrated.

[0036] like Figure 1 and Figure 3 As shown, in some embodiments, the bracket 1012 includes a through hole 10121 and annular protrusions protruding to both sides around the through hole 10121. The end of the extension arm is provided with a sleeve structure 1034, which is sleeved on the outer periphery of the annular protrusion, thereby forming a fixed connection structure between the guide tube 103 and the pretensioner body 101.

[0037] In one embodiment, the bracket 1012 is composed of a U-shaped connecting plate. The U-shaped connecting plate is arranged laterally, and its upper and lower walls are provided with through holes 10121. The annular protrusions of the through holes 10121 on the upper wall form a welding nut 10123, and the annular protrusions of the through holes 10121 on the lower wall form an inner washer 10122. Both the welding nut 10123 and the inner washer 10122 have through hole structures. The sleeve structure 1034 of the first extension arm 1032 is sleeved on the outer wall of the welding nut 10123, and the sleeve structure of the second extension arm 1033 is sleeved on the outer wall of the inner washer 10122. In this way, a fixed connection structure with high connection strength, good reliability and convenient assembly is formed between the guide tube 103 and the pretensioner body 101.

[0038] The U-shaped connecting plate has a through-hole on its side wall, through which the tensioning cable 102 passes and connects to the pre-tensioning tube 1011. The through-hole and the perforation 10121 are offset to prevent the bolt passing through the perforation 10121 from contacting the tensioning cable 102 passing through the through-hole. Preferably, the perforations on both the upper and lower walls are along the centerline, and the through-hole is located on either side of the centerline.

[0039] Preferably, such as Figure 3 As shown, the outer diameter of the welding nut 10123 is larger than the outer diameter of the inner washer 10122; correspondingly, the inner diameter of the sleeve structure 1034 of the first extension arm 1032 is larger than the inner diameter of the sleeve structure 1034 of the second extension arm 1033, thereby forming a corresponding sleeve structure and constituting a distinguishable upper and lower structure, so as to further improve assembly efficiency.

[0040] like Figure 4 As shown, in some embodiments, the seatbelt pretensioner assembly 1 further includes a stop washer 104, which engages with the outer periphery of any annular protrusion and is disposed on the outside of the sleeve structure 1034 to restrict movement of the sleeve structure 1034 away from the bracket 1012. After the sleeve structure 1034 of the extension arm is fitted onto the annular protrusion, the stop washer is then fitted into the annular protrusion to fix the position of the sleeve structure 1034.

[0041] like Figure 4As shown, preferably, the stop washer 104 is snapped onto the outer periphery of the inner washer 10122 and disposed on the outside of the sleeve structure 1034 of the second extension arm 1033; this design can fix the second extension arm 1033 from the lower part of the guide tube 103, thereby restricting the second extension arm 1033 from moving downward away from the bracket 1012, and further improving the assembly stability of the guide tube 103.

[0042] like Figure 4 and Figure 5 As shown, in some embodiments, the first end 10311 of the annular body extends outward toward the first port 401 of the column 4 to form a flared structure 1035, the outer diameter of the flared structure 1035 being larger than the diameter of the column 4; the seat belt pretensioner assembly 1 also includes a flange ring 105, which is sleeved on the annular body 1031 and extends at least partially between the first port 401 of the column 4 and the flared structure 1035. The flange ring 105 is configured to bear the load transmitted by the tension cable 102, webbing 3 and guide tube 103 in the event of a vehicle collision, acting as a protective component. Through the cooperation of the flange ring 105, the first port 401 and the flared structure 1035, the guide tube 103 forms a fixed structure at the first port 401 of the tube column 4. On the one hand, it can prevent the guide tube 103 from radially displacing inside the tube column 4. On the other hand, it can keep the guide tube 103 in a fixed axial position, avoiding axial displacement under the tension of the pretensioner body 101.

[0043] The flange ring 105 is a closed-loop metal component with high hardness and rigidity to withstand the large tensile force generated by the pretensioner body 101. Furthermore, the bore diameter of the flange ring 105 is larger than the minimum diameter of the flared structure 1035 and smaller than the maximum diameter of the flared structure 1035. During the assembly of the flange ring 105 onto the annular body 1031, the flange ring 105 is installed in the following directions: from the second end 10312 of the annular body towards the first end 10311 of the annular body, or from the end of the extension arm towards the first end 10311 of the annular body.

[0044] like Figure 4 and Figure 7As shown, in some embodiments, the seat belt pretensioner assembly 1 further includes a support ring 106. The support ring 106 has an axial opening 1061, which allows the support ring 106 to be laterally engaged with the annular body 1031 under its own elastic deformation. The support ring 106 surrounds the annular body 1031 and is fixed thereto. The first end of the support ring 106 abuts against the flange ring 105. The support ring 106 may be made of plastic. By providing the support ring 106, the relative positions between the flange ring 105 and the first port 401 and the flared structure 1035 can be fixed, further improving the assembly stability of the guide tube 103 at the first port 401 of the tube column 4.

[0045] like Figure 6 and Figure 7 As shown, in some embodiments, the inner wall of the support ring 106 is provided with a buckle 1062, which cooperates with the slot 10313 provided on the annular body 1031 so that the support ring 106 is at least partially sleeved on the surface of the annular body 1031 and forms a snap-fit ​​structure with the annular body 1031 to restrict the axial movement of the support ring 106.

[0046] Preferably, the length of the support ring 106 is less than the length of the annular body 1031, and the slot 10313 is provided at the second end 10312 of the annular body; after the wedge-shaped buckle 1062 is engaged with the slot 10313, the support ring 106 and the annular body 1031 form a fixed structure, and a reserved space is formed on one side surface of the annular body 1031 near the flared structure 1035, and the flange ring 105 is provided in the reserved space. The assembly process of the support ring 106 is as follows: After the flange ring 105 is installed into the annular body 1031, the support ring 106 is laterally inserted into the annular body 1031 through the axial opening 1061 on the support ring 106 under its own elastic deformation. Then, by rotating the support ring 106 or moving the support ring 106 towards the second end 10312 of the annular body, the wedge-shaped buckle 1062 engages with the slot 10313. After engagement, the position of the support ring 106 is fixed and cannot move towards the first end 10311 of the annular body. Figure 6 (It cannot move to the left), thus fixing the flange ring 105 in a fixed position.

[0047] like Figure 6 As shown, in some embodiments, the annular body 1031 is provided with a stepped protrusion 10314, and the end of the support ring 106 abuts against the end face of the stepped protrusion 10314. Through the above structural design, the position of the support ring 106 can be fixed and it cannot move towards the second end 10312 of the annular body (in...). Figure 6 (It cannot move to the right), so that the flange ring 105 is in a fixed position.

[0048] like Figure 4As shown, in some embodiments, the outer contour wall of the guide tube 103 is formed by connecting intersecting ribs 1036, and the outer ends of the ribs 1036 are used to fit against the inner wall of the tube column 4. Through the above structural optimization, not only can the use of consumables be reduced, but the mechanical properties such as stiffness and strength of the guide tube 103 can also be improved.

[0049] like Figure 5 and Figure 8 As shown, in some embodiments, the end piece 2 has a plate-like structure with through holes 201, and the webbing 3 is fixed through the through holes 201; the longitudinal section of the axial channel 1037 includes a wide portion 10371 in the middle and narrow portions 10372 on both sides. Figure 8 (The area is divided by a dotted line). Before the pretensioner body 101 is actuated, the two ends of the plate-like structure are located within the narrow portion 10372, and the middle portion of the webbing 3 and the plate-like structure is located within the wide portion 10371. After the webbing 3 is tied to the end piece 2, a structure that is thick in the middle and thin on both sides is formed. By designing the axial channel 1037, a good guiding effect can be provided for the end piece 2 and the webbing 3. This avoids the generation of a large gap and partial loss of the guiding effect due to the axial channel 1037 being too large. It also avoids the inability to pull the end piece 2 and the webbing 3 when the pretensioner body 101 is actuated due to the axial channel 1037 being too small, thus losing the function of tightening the webbing 3.

[0050] like Figures 1-3 and Figure 9 As shown, in some embodiments, the seat belt pretensioner assembly 1 further includes a support sleeve 107, which is disposed on the pretensioner body, preferably on the pretensioning tube 1011 and located at the second opening 402 of the tube column 4; the outer periphery of the support sleeve 107 is provided with at least one protruding rib 1071, which is configured to form an elastic interference fit with the inner wall of the tube column 4 to support the pretensioning tube 1011 and eliminate the assembly gap between the pretensioning tube 1011 and the tube column 4; thereby achieving the fixation of the seat belt pretensioner assembly 1 at the second opening 402 of the tube column 4.

[0051] Preferably, the number of ribs 1071 is selected to match the length and outer diameter of the support sleeve 107; the height of the ribs 1071 is configured to provide an appropriate interference fit between the ribs 1071 and the inner wall of the column 4, without hindering the installation of the seat belt pretensioner assembly 1 into the column 4; the ribs 1071 are annular ribs that extend continuously along the outer periphery of the support sleeve 107, or the ribs 1071 are segmented ribs that are spaced apart along the outer periphery of the support sleeve 107; the ribs 1071 are configured to undergo elastic deformation when installed into the column 4 to absorb the radial tolerance between the seat belt pretensioner assembly 1 and the column 4.

[0052] like Figure 4 and Figure 9As shown, in some embodiments, the support sleeve 107 is provided with an eccentric hole 1072, and the pre-tensioning tube 1011 is disposed in the eccentric hole 1072. Since the tensioning cable 102 connected to the pre-tensioning tube 1011 passes through the through-hole provided on one side of the center line, the pre-tensioning tube 1011 is in an eccentric position. By providing the support sleeve 107 with the eccentric hole 1072, the eccentric position of the pre-tensioning tube 1011 is corresponding to the eccentric position of the pre-tensioning tube 1011.

[0053] like Figure 9 As shown, in some embodiments, the support sleeve 107 also has at least one outer contour section 1073 to fix the position of the pretensioner body 101 during actuation. Through the design of the above structure, rotation of the pretensioner body 101 during actuation can be avoided, making the position of the pretensioner body 101 in the tubular column 4 more stable.

[0054] like Figure 10 and Figure 11 As shown in the embodiment of this specification, a vehicle seat is disclosed, including a seat body 6 and the aforementioned seat belt pretensioner assembly 1; the seat belt pretensioner assembly 1 is fixedly installed in the tube column 4 of the seat body 6. The tube column 4 is generally a transverse tube column. When a vehicle collision occurs, the pretensioner body 101 quickly pulls the tension cable 102, which drives the end piece 2 and the webbing 3 to move rapidly towards the pretensioner body 101, achieving the effect of quickly tightening the webbing 3. Furthermore, due to the influence of the guide tube, during the process of the webbing being pulled, the webbing can always maintain a certain distance from the first opening of the tube column, preventing wear; and the assembly gap in the aforementioned seat belt pretensioner assembly 1 is small, which can eliminate abnormal noise generated during vehicle vibration.

[0055] Preferably, during the assembly of the vehicle seat, components such as the pretensioner body 101, webbing 3, support sleeve 107, stop pad 104, guide tube 103, support ring 106, and flange ring 105 can be pre-installed to form a modular assembly of the column 4 that can be installed as a whole into the vehicle seat.

[0056] like Figure 1 , Figure 2 and Figure 11 As shown, in some embodiments, the seat belt pretensioner assembly 1 has a pretensioning tube 1011 and a bracket 1012. The bracket 1012 includes a through hole 10121 and a welded nut 10123 located on one side of the bracket 1012 and surrounding the through hole 10121. An inner washer 10122 is also provided on the other side of the bracket 1012. The tube column 4 has an opening 403. After the bolt 5 passes through the opening 403 and the inner washer 10122 in sequence, it is fastened to the welded nut 10123, so that the seat belt pretensioner assembly 1 is fixed in the tube column 4.

[0057] like Figure 2As shown, in some embodiments, the tubular column 4 is partially formed with a planar end, and the opening 403 is located at the planar end.

[0058] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments described later are relatively simple in description since they correspond to the system, and relevant parts can be referred to the descriptions in the system embodiments.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A seatbelt pretensioner assembly, comprising a pretensioner body and a tensioning cable, wherein the pretensioner body is fixed inside the column of a vehicle seat, one end of the tensioning cable is connected to a webbing via an end piece, and the other end is connected to the pretensioner body, wherein, when the pretensioner body is actuated, the tensioning cable can drive the end piece and the webbing to move toward the pretensioner body, characterized in that, The seatbelt pretensioner assembly also includes a guide tube; the guide tube is fixed in the column, the outer contour wall of the guide tube is at least partially attached to the inner wall of the column, and the inner contour wall of the guide tube at least partially forms an axial channel, the axial channel being configured to hold the end piece in a predetermined radial position before the pretensioner body is actuated, and to provide guidance for the movement of the end piece after the pretensioner body is actuated.

2. The seatbelt pretensioner assembly as described in claim 1, characterized in that, The guide tube includes an annular body and at least two extension arms; The annular body is located near the first opening of the tubular column; the axial channel is formed inside the annular body; Each of the aforementioned extension arms is disposed in the tubular column and is respectively connected to the annular main body; The pretensioner body includes a pretension tube and a bracket disposed at the end of the pretension tube, with the ends of each extension arm clamped on the bracket.

3. The seatbelt pretensioner assembly as described in claim 2, characterized in that, The bracket includes a perforation and annular protrusions protruding to both sides around the perforation. The end of the extension arm is provided with a sleeve structure, which is sleeved around the outer periphery of the annular protrusions.

4. The seatbelt pretensioner assembly as described in claim 3, characterized in that, The seat belt pretensioner assembly also includes a stop washer, which engages with the outer periphery of any of the annular protrusions and is disposed on the outside of the sleeve structure to restrict the movement of the sleeve structure away from the bracket.

5. The seatbelt pretensioner assembly as described in claim 2, characterized in that, The first end of the annular body extends outward toward the first opening of the tube column to form a flared structure, the outer diameter of the flared structure being larger than the tube diameter of the tube column; the seat belt pretensioner assembly also includes a flange ring, the flange ring being sleeved on the annular body and extending at least partially between the first opening of the tube column and the flared structure.

6. The seatbelt pretensioner assembly as described in claim 5, characterized in that, The seat belt pretensioner assembly also includes a support ring with an axial opening that allows the support ring to be laterally engaged with the annular body under its own elastic deformation. The support ring surrounds and is fixed around the annular body, and the first end of the support ring abuts against the flange ring.

7. The seatbelt pretensioner assembly as described in claim 6, characterized in that, The inner wall of the support ring is provided with a buckle, which cooperates with the groove provided on the annular body to make the support ring at least partially sleeved on the surface of the annular body and form a snap-fit ​​structure with the annular body to restrict the axial movement of the support ring.

8. The seatbelt pretensioner assembly as described in claim 6, characterized in that, The annular body has a stepped protrusion, and the end of the support ring abuts against the end face of the stepped protrusion.

9. The seatbelt pretensioner assembly as described in claim 2, characterized in that, The outer contour wall of the guide tube is formed by intersecting ribs connected together, and the outer ends of the ribs are used to fit against the inner wall of the tube column.

10. The seatbelt pretensioner assembly as described in any one of claims 1-9, characterized in that, The end piece has a plate-like structure with through holes, and the webbing is fixed through the through holes; The longitudinal section of the axial channel includes a wide portion in the middle and narrow portions on both sides; before the pretensioner body is actuated, the two ends of the plate-like structure are located in the narrow portions, and the webbing and the middle portion of the plate-like structure are located in the wide portion.

11. The seatbelt pretensioner assembly as claimed in claim 10, characterized in that, The seat belt pretensioner assembly also includes a support sleeve, which is disposed on the pretensioner body and located at the second port of the tube column; the outer periphery of the support sleeve is provided with at least one protruding rib, which is configured to form an elastic interference fit with the inner wall of the tube column to support the pretensioner body and eliminate the assembly gap between the pretensioner body and the tube column.

12. The seatbelt pretensioner assembly as claimed in claim 11, characterized in that, The support sleeve is provided with an eccentric hole, and the pre-tightening tube is disposed in the eccentric hole; The support sleeve also has at least one outer contour section to fix the position of the pretensioner body during actuation.

13. The seatbelt pretensioner assembly as claimed in claim 11, characterized in that, The ribs in the support sleeve satisfy at least one of the following conditions: The number of protruding ribs is selected according to the length and outer diameter of the support sleeve; The height of the rib is configured such that the rib has an appropriate interference fit with the inner wall of the column, and does not hinder the installation of the seat belt pretensioner assembly into the column. The rib is an annular rib that extends continuously along the outer periphery of the support sleeve, or the rib is a segmented rib that is spaced apart along the outer periphery of the support sleeve. The rib is configured to elastically deform upon insertion into the tubing to absorb radial tolerances between the seatbelt pretensioner assembly and the tubing.

14. A vehicle seat, characterized in that, It includes a seat body and a seat belt pretensioner assembly as described in any one of claims 1-13; the seat belt pretensioner assembly is fixedly installed in the column of the seat body.

15. The vehicle seat as claimed in claim 14, characterized in that, The seat belt pretensioner assembly includes a pretensioning tube and a bracket, the bracket including a through hole and a welded nut located on one side of the bracket and surrounding the through hole, and an inner washer on the other side of the bracket; The tubular column has an opening. After the bolt passes through the opening and the inner washer in sequence, it is tightened with the welding nut to fix the seat belt pretensioner assembly in the tubular column.

16. The vehicle seat as claimed in claim 15, characterized in that, The tubular column has a partially planar end, and the opening is located at the planar end.

Images