Safety belt pre-tightening device

Abstract

The utility model relates to a safety belt pre-tightening device which is used for being installed on an automobile seat, the automobile seat comprises a pipe column, the safety belt pre-tightening device comprises a pipe body, a transmission element and a pre-tightening assembly, the pipe body is located in the pipe column and comprises a first pipe body part and a second pipe body part, and the first pipe body part and the second pipe body part are fixedly connected. A first limiting structure is arranged on the first pipe body part, a second limiting structure is arranged on the pipe column, and the first limiting structure and the second limiting structure are matched with each other, so that the first pipe body part is fixedly connected with the pipe column; the pre-tightening assembly is arranged in the pipe body in a sliding mode, one end of the transmission element is fixedly connected with the braid, and the other end of the transmission element penetrates through the first pipe body part and enters the pipe body to be fixedly connected with the pre-tightening assembly. When the safety belt pre-tightening device is installed, only the pipe body needs to move in the axial direction in the pipe column and rotate in the axial direction till the pipe body cannot continue to move, and the safety belt pre-tightening device is more convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle safety, and more particularly to a seat belt pretensioner device. Background Art

[0002] The function of the seat belt pretensioner device is to quickly tighten the webbing after a collision, eliminating the gap between the occupant and the webbing, which can prevent the occupant from diving and reduce the injuries suffered by the occupant during the collision.

[0003] As Figure 1 shown, the existing seat belt pretensioner device is usually installed in the column 10 of the vehicle seat. The seat belt pretensioner device includes a tube body (such as a steel tube) 21, a steel wire rope 22, and a pretensioning assembly 23. The steel tube 21 is fixed in the column 10. The pretensioning assembly 23 is located inside the steel tube 21 and can move axially inside the steel tube 21. One end of the steel wire rope 22 is fixedly connected to the pretensioning assembly 23, and the other end extends outside the steel tube 21 and is fixedly connected to the webbing 30. When a vehicle collision occurs, the pretensioning assembly 23 will be triggered and move axially inside the steel tube 21, and pull the webbing 30 in the column 10 towards the steel tube 21 through the steel wire rope 22, thereby tightening the webbing.

[0004] However, in the prior art, the steel tube 21 is fixed to the column 10 by bolts 24, thereby restricting the axial and circumferential degrees of freedom of the steel tube 21. Therefore, screw holes are provided on both the steel tube 21 and the column 10. During installation, the steel tube 21 needs to be first placed in the column 10 and the screw holes of the two need to be aligned, and then the bolts 24 are passed through the screw holes of the two to achieve fixation. In order to align the screw holes, the installer needs to continuously adjust the axial and circumferential positions of the steel tube 21 in the column 10, which results in complex installation and great inconvenience. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a seat belt pretensioner device to solve the technical problem of inconvenient installation in the prior art.

[0006] For the above purposes, the present utility model provides a seat belt pre-tensioning device, including: 1. A seat belt pre-tensioning device, characterized in that it is used to be installed on an automotive seat. The automotive seat includes a tube column. The seat belt pre-tensioning device includes a tube body, a transmission element, and a pre-tensioning assembly. The tube body is located inside the tube column. The tube body includes a first tube body part and a second tube body part. The first tube body part and the second tube body part are fixedly connected. The first tube body part is provided with a first limiting structure, and the tube column is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate with each other to fixedly connect the first tube body part to the tube column. The pre-tensioning assembly is slidably arranged inside the tube body. One end of the transmission element is fixedly connected to the webbing, and the other end passes through the first tube body part and enters the tube body to be fixedly connected to the pre-tensioning assembly.

[0007] Further, the first limiting structure includes a convex column. The convex column surrounds the first tube body part. The convex column is provided with a plurality of teeth arranged at intervals in the circumferential direction. Each tooth extends axially. A groove is formed between any two teeth. The second limiting structure is a convex bump. The convex bump and the groove cooperate with each other to fixedly connect the first tube body part to the tube column.

[0008] Further, one end of the tooth close to the second tube body part is formed into a tip.

[0009] Further, the outer diameter of the tooth gradually decreases in the direction close to the second tube body part.

[0010] Further, one end of the tooth close to the second tube body part is formed into a blunt end.

[0011] Further, the outer diameter of the tooth remains unchanged axially.

[0012] Further, the outer diameter of the tooth is greater than or equal to the outer diameter of the convex column.

[0013] Further, there are a plurality of convex bumps, which are evenly arranged along the circumferential direction of the tube column.

[0014] Further, the convex bump is formed by a part of the tube column protruding inward, or is formed by a protrusion fixed to the inner side of the tube column.

[0015] Further, it further includes a nut, and the nut fixes together one end of the tube column and the second tube body part away from the first tube body part.

[0016] Further, it further includes a sleeve. The first limiting structure is formed on the outer side of the sleeve. The sleeve is sleeved on the outer side of the first tube body part and is fixed to the first tube body part.

[0017] Further, a protrusion is provided on the first tube body portion, and a clamping groove is provided on the sleeve. The protrusion and the clamping groove cooperate with each other to fixedly connect the first tube body portion and the sleeve.

[0018] For the seat belt pretensioning device of the present invention, the tube body and the tube column are fixedly connected through the first limiting structure and the second limiting structure. During installation, it is only necessary to move the tube body axially in the tube column and rotate it around the axis until the tube body can no longer move, without aligning the screw holes and tightening the bolts, making the installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of an existing seat belt pretensioning device installed in a tube column of an automobile seat;

[0020] Figure 2 is a schematic structural diagram of a seat belt pretensioning device according to an embodiment of the present invention;

[0021] Figure 3 is an exploded view of a seat belt pretensioning device and an automobile seat according to an embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a seat belt pretensioning device installed on an automobile seat according to an embodiment of the present invention;

[0023] Figure 5 is Figure 4 the A-A cross-sectional view of;

[0024] Figure 6 is a schematic structural diagram of the first tube body portion of a seat belt pretensioning device according to an embodiment of the present invention;

[0025] Figure 7 is a circumferential cross-sectional view of a seat belt pretensioning device and a tube column fixed according to an embodiment of the present invention;

[0026] Figure 8 is an exploded view of the first tube body portion and a sleeve according to an embodiment of the present invention;

[0027] Figure 9 is another schematic structural diagram of a seat belt pretensioning device according to an embodiment of the present invention;

[0028] Figure 10 is Figure 9 the exploded view of. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0030] As shown in Figure 2 and Figure 3, Figure 4 and Figure 5 As shown in Figure 4 and Figure 5 , an embodiment of the present utility model provides a seat belt pre-tensioning device, which is installed on a vehicle seat 100. The vehicle seat 100 includes a tube column 110 for accommodating the seat belt pre-tensioning device. The seat belt pre-tensioning device includes a tube body 200, a transmission element 300, and a pre-tensioning 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. The first tube body portion 210 and the second tube body portion 220 are fixedly connected. The first tube body portion 210 is provided with a first limiting structure 211, and the tube column 110 is provided with a second limiting structure 111. The first limiting structure 211 and the second limiting structure 111 cooperate with each other to limit the circumferential and axial movement of the first tube body portion 210, so that the first tube body portion 210 and the tube column 110 are fixed; the pre-tensioning assembly 400 is located inside the tube body 200 and can move axially inside the tube body 200. One end of the transmission element 300 is fixedly connected to the webbing 500, and the other end extends through the first tube body portion 210 and enters the tube body 200 to be fixedly connected to the pre-tensioning assembly 400; when a vehicle collision occurs, the pre-tensioning assembly 400 will be triggered to move in the tube body 200 in a direction away from the first tube body portion 210, and drive the webbing 500 to move together through the transmission element 300, that is, make the webbing 500 enter the tube column 110 and move towards the first tube body portion 210 in the tube column 110, thereby tightening the webbing, playing a pre-tensioning role, preventing the occupant from diving, and reducing the injury suffered by the occupant during the collision. Since the first tube body portion 210 and the tube column 110 are fixedly connected through mutually matching limiting structures, during installation, only the tube body 200 needs to be inserted into the tube column 110, and then the tube body 200 is moved axially. When the tube body 200 can no longer move axially, the tube body 200 can be rotated around the axis until the tube body 200 can no longer rotate. At this time, the first limiting structure 211 and the second limiting structure 111 cooperate with each other and limit the tube body 200, that is, the fixation between the tube body 200 and the tube column 110 is achieved. Compared with the prior art, there is no need to align the screw holes and operate the bolts, and the installation is more convenient and fast.

[0031] In some embodiments, the transmission element 300 can be a cable, a connecting rod, or any other suitable connecting member.

[0032] In some embodiments, the transmission element 300 can be fixedly connected to the webbing 500 through a fixing element 600 (such as a fixing piece, a fixing block, etc.). The fixing element 600 can be disposed inside the pipe column 110 or outside the pipe column 110. When it is disposed inside the pipe column 110, the pre-tensioning device can be hidden, so that the occupant cannot see any components of the pre-tensioning device, giving an aesthetic and concise effect. When it is disposed outside the pipe column 110, the webbing 500 can be more conveniently connected to the fixing element 600. The fixing element 600 can be arranged to move to the first pipe body portion 210 under the drive of the pre-tensioning assembly 400 and interfere with the first pipe body portion 210 (i.e., be blocked by the first pipe body portion 210) and thus unable to move further.

[0033] In some embodiments, the first pipe body portion 210 and the second pipe body portion 220 can be fixedly connected by welding, bonding, snap connection, threaded connection or any other suitable means to form the pipe body 200. Exemplarily, the first pipe body portion 210 can be provided with an external thread, and the second pipe body portion 220 is provided with an internal thread matching the external thread. In this way, by screwing the external thread of the first pipe body portion 210 into the internal thread of the second pipe body portion 220, the two can be fixedly connected.

[0034] As Figure 6 shown, in some embodiments, the first limiting structure 211 includes a convex column 2111. The convex column 2111 surrounds the first pipe body portion 210 and is sleeved outside the first pipe body portion 210. A plurality of teeth 2112 are arranged at intervals in the circumferential direction on the convex column 2111. Each tooth 2112 extends axially, and a groove 2113 is formed between any two teeth 2112; the second limiting structure 111 is a convex bulge on the inner wall of the pipe column 110. The convex bulge protrudes radially inward. The inner diameter of the inscribed circle formed by the convex bulge is greater than the outer diameter of the first pipe body portion 210 but less than the outer diameter of the first pipe body portion 210 plus the convex column 2111. In this way, when the convex bulge is located in the groove 2113, the convex bulge will simultaneously contact the convex column 2111 and the two teeth 2112 forming the groove 2113, that is, the convex bulge will be stuck in the groove 2113 and limit the axial movement (restricted by the two teeth 2112) and circumferential movement (restricted by the convex column 2111) of the first pipe body portion 210. The first limiting structure 211 can be fixed on the first pipe body portion 210 or formed as a part of the first pipe body portion 210.

[0035] As Figure 7 shown, in some embodiments, the number of convex bulges can be multiple, and they can be evenly arranged in the circumferential direction. The number of convex bulges can be set as needed. It can be less than or equal to the number of grooves 2113, but cannot be greater than the number of grooves 2113.

[0036] When installing the pre-tightening device, the end of the second pipe body portion 220 of the pipe body 200 away from the first pipe body portion 210 is inserted into the pipe string 110 from the left side in Figure 5 and moves axially to the right in the pipe string 110. When it moves to the convex bump abuts against the tooth 2112 or the convex column 2111, interference will occur between the two. At this time, the pipe body 200 will no longer be able to move axially. Then, try to rotate the pipe body 200. If the pipe body 200 can be rotated, it means that the convex bump has not reached the groove 2113 yet. At this time, while rotating the pipe body 200, move the pipe body 200 axially until the pipe body 200 can no longer move circumferentially and axially. At this time, it means that the convex bump is completely located in the groove 2113. Then, the end of the second pipe body portion 220 away from the first pipe body portion 210 can be fixed to the right end of the pipe string 110 through the nut 700, so as to prevent the pipe body 200 from moving to the left. In this way, the pipe body 200 will be fixed in the pipe string 110, and it can neither move axially nor move circumferentially.

[0037] In some embodiments, the end of the tooth 2112 close to the second pipe body portion 220 can be formed into a tip, and the outer diameter of the tooth 2112 gradually decreases along the direction close to the second pipe body portion 220, that is, the closer the tooth 2112 is to the second pipe body portion 220, the smaller the outer diameter. In this way, during the installation process, if the convex bump is not aligned with the groove 2113, when the pipe body 200 moves to the convex bump contacts the tip of the tooth 2112, the convex bump will move along the tooth 2112. As the outer diameter of the tooth 2112 gradually becomes larger, the convex bump will be blocked by the tooth 2112 and cannot continue to move axially. Since the convex bump is not located in the groove 2113 at this time, it can rotate. As the pipe body 200 rotates, the convex bump will fall from the tooth 2112 into the groove 2113, and then continue to push the pipe body 200 to move it axially until the convex bump is blocked by the convex column 2111 and cannot continue to move axially. Then, fix the end of the second pipe body portion 220 away from the first pipe body portion 210 through the nut 700 to complete the installation of the pipe body 200.

[0038] In some embodiments, the end of the tooth 2112 close to the second pipe body portion 220 can also be formed into a blunt end, and the outer diameter of the tooth 2112 is the same as the outer diameter of the convex column 2111. In this way, during the installation process, when the pipe body 200 moves, if the convex bump is not aligned with the groove 2113, when the pipe body moves to the convex bump contacts the blunt end of the tooth 2112, the blunt end will guide the convex bump into the groove 2113, so as to conveniently realize the installation of the pipe body 200. When it is formed into a blunt end, the outer diameter of the tooth 2112 can remain unchanged axially.

[0039] In some embodiments, the convex hull may be formed by inwardly protruding a part of the pipe string 110, or may be formed by fixing (such as welding, bonding, screwing, etc.) a protrusion (such as a rivet, screw, pin, etc.) to the inner wall of the pipe string 110.

[0040] As Figure 8 shown, the first limiting structure 211 may not be directly formed on the outer side of the first pipe body part 210, but may be formed on the sleeve 800. The sleeve 800 is sleeved on the outer side of the first pipe body part 210 and fixedly connected to the first pipe body part 210. In this way, the first limiting structure 211 and the first pipe body part 210 can be separated from each other to achieve a detachable connection. Thus, the size of the first limiting structure 211 can be adjusted as needed to adapt to pipe strings 110 of different sizes. Specifically, a protrusion 212 may be provided on the first pipe body part 210, and a clamping groove 810 may be provided on the sleeve 800. After the sleeve 800 is sleeved on the outer side of the first pipe body part 210, the protrusion 212 can be inserted into the clamping groove 810 to fixedly connect the sleeve 800 and the first pipe body part 210.

[0041] As Figure 9 and Figure 10 shown, in some embodiments, the pipe body 200 may also be formed as non-cylindrical. The sleeve 800 is fixed on the outer side of the pipe body 200, and the first limiting structure 211 is provided on the outer side of the sleeve 800. Through the cooperation of the first limiting structure 211 and the second limiting structure 111 of the pipe string 110, the fixation of the non-cylindrical pipe body 200 and the pipe string 110 is achieved.

[0042] Continuing to refer to Figure 5 , the pre-tightening assembly 400 may include a sleeve 410, a limiting block 420, and a gas generator 430. The limiting block 420 and the gas generator 430 are fixed inside the sleeve 410. The sleeve 410 is located inside the pipe body 200 and can move axially in the pipe body 200. One end of the transmission element 300 may be fixedly connected to the limiting block 420. A sealing cavity is formed between the limiting block 420 and the end of the first pipe body part 210 far from the second pipe body part 220. An air outlet is provided on the sleeve 410 for communicating the sealing cavity and the inside of the sleeve 410. A wire 440 is provided on the gas generator 430. The wire 440 extends out of the pipe body 200 from the end of the second pipe body part 220 far from the first pipe body part 210 and further extends out of the pipe string 110. The wire 440 can be electrically connected to the vehicle electronic control unit. In the event of a collision, the vehicle electronic control unit can trigger the gas generator 430 to release gas. The gas enters the sealing cavity from the air outlet and pushes the sleeve 410 to move in the direction away from the first pipe body part 210. At the same time, the webbing 500 is driven to move together through the transmission element 300, thereby tightening the webbing 500.

[0043] The seat belt pre-tensioning device according to the embodiment of the present utility model fixedly connects the tube body 200 to the tube column 110 through the first limiting structure 211 and the second limiting structure 111. During installation, it only needs to move the tube body 200 axially and rotate it around the axis in the tube column 110 until the tube body 200 can no longer move, without the need to align the screw holes and tighten the bolts, making the installation more convenient.

[0044] It should be noted that the present utility model (such as the utility model concept, etc.) has been described in the specification of this patent document and / or illustrated in the drawings according to the exemplary embodiments; the embodiments of the present utility model are only presented by way of example and are not intended to limit the scope of the present utility model. The structure and / or arrangement of the elements of the utility model concept embodied in the present utility model as described in the specification and / or illustrated in the drawings are only illustrative. Although the exemplary embodiments of the present utility model have been described in detail in this patent document, it is easy for those of ordinary skill in the art to understand that equivalents, modifications, variations, etc. of the subject matter of the exemplary embodiments and alternative embodiments are possible and are considered to be within the scope of the present utility model; all such subject matter (such as modifications, variations, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present utility model. It should also be noted that various / other modifications, variations, substitutions, equivalents, changes, omissions, etc. can be made in the configuration and / or arrangement of the exemplary embodiments (such as in terms of concept, design, structure, device, form, assembly, construction, means, function, system, process / method, steps, order of process / method steps, operation, operating conditions, performance, materials, composition, combination, etc.) without departing from the scope of the present utility model; all such subject matter (such as modifications, variations, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present utility model. The scope of the present utility model is not intended to be limited to the subject matter described in the specification and / or drawings of this patent document (such as details, structure, function, materials, behavior, steps, order, system, results, etc.). Considering that the claims of this patent document will be properly interpreted to cover the entire scope of the subject matter of the present utility model (such as including any and all such modifications, variations, embodiments, combinations, equivalents, etc.); it should be understood that the terms used in this patent document are for the purpose of describing the subject matter of the exemplary embodiments and are not intended as a limitation on the scope of the present utility model.

[0045] It should also be noted that according to the exemplary embodiments, the present utility model may include conventional technologies (such as technologies implemented and / or integrated in the exemplary embodiments, modifications, variations, combinations, equivalents), or may include any other applicable technologies (present and / or future) with the ability to perform the functions and processes / operations described in the specification and / or illustrated in the drawings. All such technologies (such as technologies implemented in the form of embodiments, modifications, variations, combinations, equivalents, etc.) are considered to be within the scope of the present utility model in this patent document.

Claims

1. A seat belt pretensioning device, characterized in that, For installation on an automotive seat, the automotive seat includes a column, and the seat belt pretensioner includes a tube body, a transmission element, and a pretensioning assembly. The tube body is located within the column. The tube body includes a first tube body portion and a second tube body portion, and the first tube body portion and the second tube body portion are fixedly connected. A first limiting structure is provided on the first tube body portion, and a second limiting structure is provided on the column. The first limiting structure and the second limiting structure cooperate with each other to fixedly connect the first tube body portion to the column. The pretensioning assembly is slidably disposed within the tube body. One end of the transmission element is fixedly connected to the webbing, and the other end passes through the first tube body portion and enters the tube body to be fixedly connected to the pretensioning assembly.

2. The seat belt pretensioning device according to claim 1, wherein The first limiting structure includes a convex column that surrounds the first tube body portion. A plurality of teeth are provided on the convex column, and the teeth are arranged at intervals in the circumferential direction. Each tooth extends axially, and a groove is formed between any two teeth. The second limiting structure is a convex bump, and the convex bump and the groove cooperate with each other to fixedly connect the first tube body portion to the column.

3. The seat belt pretensioning device according to claim 2, characterized in that, One end of the tooth close to the second tube body portion forms a tip.

4. The seat belt pretensioner according to claim 3, characterized in that, The outer diameter of the tooth gradually decreases in the direction close to the second tube body portion.

5. The seat belt pretensioning device according to claim 2, characterized in that, One end of the tooth close to the second tube body portion forms a blunt end.

6. The seat belt pretensioner according to claim 5, characterized in that, The outer diameter of the tooth remains unchanged axially.

7. The seat belt pretensioning device according to claim 5, characterized in that, The outer diameter of the tooth is greater than or equal to the outer diameter of the convex column.

8. The seat belt pretensioning device according to claim 2, wherein, There are a plurality of the convex bumps, and they are evenly arranged in the circumferential direction of the column.

9. The seat belt pretensioning device according to claim 2, wherein The convex bump is formed by a part of the column protruding inward, or is formed by a protrusion fixed to the inner side of the column.

10. The seat belt pre-tensioning device according to claim 2, characterized in that, It further includes a nut that fixes the column and the end of the second tube body portion away from the first tube body portion together.

11. The seat belt pretensioner according to claim 1, characterized in that, It further includes a sleeve. The first limiting structure is formed on the outer side of the sleeve. The sleeve is sleeved on the outer side of the first tube body portion and is fixed to the first tube body portion.

12. The seat belt pretensioner according to claim 11, characterized in that, A protrusion is provided on the first tube body portion, and a card slot is provided on the sleeve. The protrusion and the card slot cooperate with each other to fixedly connect the first tube body portion to the sleeve.

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