Pre-tightening device, retractor device, safety belt device, seat and vehicle

Abstract

The utility model discloses a pre-tightening device, a retractor device, a safety belt device, a seat and a vehicle. The pre-tightening device comprises a gas generation unit and a barrel. The transmission part is at least partially arranged in the cylinder body, the transmission part can be pushed by the gas released by the gas generation unit to move, and the transmission part is provided with a pressure relief hole; the buffer part is arranged in the cylinder body, and the buffer part is arranged on the side, away from the gas generation unit, of the pressure relief hole. Through the ingenious design and combination of the gas generation unit, the cylinder body, the transmission piece and the buffer piece, the efficient, safe and controllable pre-tightening device is achieved. The safety of the structure can be effectively enhanced, the energy loss is small, the assembly precision requirement is low, and the transmission stability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a pre -tensioner, safety belt winder, safety belt device, seat and vehicle. BACKGROUND

[0002] When the vehicle collision occurs, the pre -tentioner in the car safety belt winder responds rapidly, it will be detonated in very short time and provide the tension to pull the safety belt, so that the safety belt can provide the maximum protection for the passenger in the first instant of collision, because the core of this response is the gas generating unit, it will be detonated in very short time, generates high temperature and high pressure gas, and the high temperature and high pressure gas will be ejected through the pre -tensioner and form sparks, which may cause secondary injury to the passenger, therefore, the problem of secondary injury caused by high temperature and high pressure gas generated by the gas generating unit needs to be solved, and the passenger needs to be provided with all -round and multi -level protection. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a pre -tensioner, which increases the discharge path and time of high temperature and high pressure gas, reduces the temperature of the gas ejected from the port of the cylinder, reduces the risk of damage and combustion of high temperature gas around, can effectively improve the safety of the pre -tensioner, and has the advantages of easy processing, simple assembly and the like.

[0004] The utility model further provides a winder device with the pre -tensioner.

[0005] The utility model further provides a safety belt device with the winder device.

[0006] The utility model further provides a seat with the safety belt device.

[0007] The utility model further provides a vehicle with the seat.

[0008] In order to achieve the above purpose, according to the first aspect embodiment of the utility model provides a pre -tensioner, including:

[0009] Gas generating unit,

[0010] Cylinder;

[0011] Transmission part, the transmission part is at least partially arranged in the cylinder, the transmission part can move under the push of the gas released by the gas generating unit, and the transmission part is provided with a pressure relief hole;

[0012] Buffer, the buffer is arranged in the cylinder, and the buffer is arranged on the side, away from the gas generating unit, of the pressure relief hole.

[0013] According to some embodiments of the present application, a gap is formed between the buffer and the inner wall of the cylinder.

[0014] According to some embodiments of the present application, a chamfer or a rounded corner structure is arranged at the part of the buffer close to the inner wall of the cylinder.

[0015] According to some embodiments of the present application, the buffer is provided with at least one through hole for gas circulation.

[0016] According to some embodiments of the present application, the buffer is integrally formed with the transmission member.

[0017] According to some embodiments of the present application, the buffer surrounds the transmission member.

[0018] According to some embodiments of the present application, the transmission member comprises a body and a boss, the boss is radially protruded from the body, the boss is spaced apart from the buffer, the boss, the buffer and the cylinder enclose a first cavity, the pressure relief hole is arranged on the boss, and the pressure relief hole is in communication with the first cavity.

[0019] According to some embodiments of the present application, the pressure relief hole is a stepped hole.

[0020] According to some embodiments of the present application, the pressure relief hole comprises a first hole section and a second hole section in communication, the first hole section is close to the gas generating unit, and the cross-sectional area of the first hole section is greater than that of the second hole section.

[0021] According to some embodiments of the present application, the body has opposite first and second sides, the distance between the first side and the inner wall of the cylinder is greater than the distance between the second side and the inner wall of the cylinder, and the pressure relief hole is arranged on the first side.

[0022] According to some embodiments of the present application, the pre-tightening device further comprises a sealing member arranged between the transmission member and the cylinder.

[0023] According to some embodiments of the present application, the boss is provided with a groove, and the sealing member is arranged in the groove.

[0024] According to some embodiments of the present application, the boss is provided with a stop portion arranged on one side of the groove close to the buffer, and the stop portion is used for limiting the sealing member.

[0025] According to some embodiments of the present application, a limiting portion is further arranged, and the limiting portion is adapted to cooperate with the transmission member to limit the transmission member.

[0026] According to the second aspect of the utility model, a retractor device is provided, the retractor device comprises at least the pre-tightening device of the first aspect of the utility model and a tape reel, the transmission member is configured as a gear, and the gear is in transmission cooperation with the tape reel.

[0027] According to the third aspect of the utility model, a safety belt device is provided, and the safety belt device comprises at least a webbing and the retractor device of the second aspect of the utility model.

[0028] According to the fourth aspect of the utility model, a seat is provided, and the seat comprises a seat body and the safety belt device of the third aspect of the utility model.

[0029] According to the fifth aspect of the utility model, a vehicle is provided, and the vehicle comprises a vehicle body and the seat of the fourth aspect of the utility model.

[0030] According to the above scheme, the utility model has the following beneficial effects:

[0031] In the designed pre-tightening device, a gas generating unit, a cylinder and a transmission member are included. The gas generating unit is detonated to release high-pressure gas when a collision occurs. The gas generating unit is arranged at one end of the cylinder, and the transmission member is at least partially arranged inside the cylinder. The transmission member is a key component connecting the gas generating unit and a subsequent actuating mechanism, and can move under the push of the gas released by the gas generating unit. This design enables the transmission member to efficiently transmit the energy generated by the gas and convert it into mechanical movement.

[0032] A boss is specially arranged on the transmission member, and a pressure relief hole is arranged on the boss.

[0033] In order to further enhance the safety of the system, a buffer is arranged on the transmission member. The buffer is located on the side of the pressure relief hole away from the gas generating unit, and is arranged in a spaced manner with the boss. The buffer, the boss and the cylinder form a first cavity. When the high-temperature and high-pressure gas flows out of the pressure relief hole, it will enter the first cavity. The buffer arranged at the rear end will stop the high-temperature and high-pressure gas, thereby increasing the discharge path and time of the high-temperature and high-pressure gas, reducing the temperature of the gas sprayed out of the pressure pipe port, and reducing the risk of damage and combustion of the surrounding high-temperature gas. At the same time, a gap is formed between the buffer and the inner wall of the cylinder, so that the gas can overflow from the gap to complete the release. At the same time, the gunpowder particles in the gas can be more fully burned before being discharged from the pressure pipe, avoiding the formation of sparks when the gunpowder particles fly out of the pressure pipe.

[0034] In summary, the scheme realizes an efficient, safe and controllable pre-tightening device through the ingenious design and combination of the gas generating unit, the cylinder, the transmission member and the buffer.

[0035] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0037] Figure 1 This is an overall structural diagram of an embodiment of a pre-tightening device provided in this application;

[0038] Figure 2 This is a cross-sectional view of an embodiment of a pre-tightening device provided in this application;

[0039] Figure 3 This is a cross-sectional structural diagram of a pre-tightening device embodiment provided in this application;

[0040] Figure label:

[0041] 1. Gas generating unit;

[0042] 2. Transmission component; 21. Body; 211. Buffer component; 212. Boss; 213. First cavity; 214. Gap; 215. Pressure relief hole; 216. Groove; 22. Serrated part;

[0043] 3. Cylinder body;

[0044] 4. Pre-tightened guard plate;

[0045] 5. Sealing components;

[0046] 6. Limiting part; 61. Extension part.

[0047] 71. Second side; 72. First side Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0052] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0053] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] The pre-tightening device according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0055] like Figures 1-2 As shown, the pre-tightening device according to an embodiment of the present invention includes: a gas generating unit 1, a cylinder 3, a transmission member 2, the transmission member 2 being at least partially disposed within the cylinder 3, the transmission member 2 being able to move under the push of the gas released by the gas generating unit 1, the transmission member 2 being provided with a pressure relief hole 215; and a buffer member 211, the buffer member 211 being disposed within the cylinder 3, the buffer member 211 being disposed on the side of the pressure relief hole 215 away from the gas generating unit 1.

[0056] It can be understood that the gas generating unit 1 is arranged at the end position of the cylinder body 3, the transmission member 2 is arranged at least partially in the cylinder body, the gas generating unit 1 is configured to generate high-temperature and high-pressure gas in a certain state, the high-temperature and high-pressure gas can generate strong internal energy which is converted into mechanical energy to drive the transmission member 2 to move, and the transmission member 2 triggers the execution device when moving, thereby playing a role in protecting the passenger. In order to avoid the gas pressure of the high-temperature and high-pressure gas being too large, it is necessary to release the gas pressure, therefore, the transmission member 2 is provided with a pressure relief hole 215, the high-temperature and high-pressure gas is released through the pressure relief hole 215, and the temperature and pressure can be reduced through the pressure relief hole 215, but the gas is still insufficient to reach a safe level, therefore, a buffer member 211 is further arranged, the buffer member 211 is arranged in the cylinder body 3, the buffer member 211 is arranged on the side of the pressure relief hole 215 away from the gas generating unit 1, and the buffer member 211 is used for buffering the gas flowing out of the pressure relief hole 215. Specifically, the gas flowing out of the pressure relief hole 215 will impact on the buffer member 211, the discharge path and time of the high-temperature and high-pressure gas are further prolonged, thereby the gas can be cooled and depressurized for a second time, and finally the temperature and pressure of the gas sprayed out of the port of the cylinder body 3 can reach a level which is insufficient to cause damage and combustion of surrounding objects, and the safety can be improved.

[0057] It can be understood that the cylinder body 3 can be a cylinder or any other shape, as long as an accommodating cavity is formed inside for accommodating the transmission member 2 and enabling the gas to gather inside to drive the transmission member 2 to move.

[0058] In some embodiments, as shown in Figure 2 It can be understood that the gas flowing out of the gas generator unit needs to be released after being cooled and depressurized for multiple times, therefore, the inner diameter of the buffer member 211 is smaller than the inner diameter of the cylinder body 3, thereby the gas flow can slowly overflow, in this way, not only can the gas release process be effectively controlled to prevent potential safety hazards caused by the gas being released sharply, but also the overall pressure balance of the system can be adjusted to a certain extent to ensure smooth operation of the entire gas processing process.

[0059] In some embodiments, the buffer 211 is provided with at least one through-hole, the opening of which faces along the flow direction of the gas. It can be understood that the buffer 211 is designed to closely fit the barrel 3, and specifically, when the gas flows out of the gas generating unit 1 and is subjected to temperature and pressure reduction processing, they will impact the buffer 211 according to the established path. At this time, the existence of the through-hole is like a carefully arranged "valve", which allows the gas to pass through these openings in a more dispersed and orderly manner, rather than suddenly and violently spewing out from a large opening. This dispersed outflow manner not only helps to further reduce the flow rate of the gas, but also effectively reduces the noise and vibration caused by the sudden release of the gas, thereby improving the stability and reliability of the entire system.

[0060] In addition, the number, size and arrangement of the through-holes can also be customized and optimized according to specific application scenarios and requirements. For example, in situations where higher precision control of gas flow is required, the number of through-holes can be increased or their size can be reduced; while in situations where the requirement for gas flow is relatively loose, the number of through-holes can be appropriately reduced or their size can be increased. This flexible design enables the buffer 211 to be widely applicable to various gas release and control application scenarios.

[0061] In some embodiments, the part of the buffer 211 close to the inner wall of the barrel 3 is provided with a chamfered or rounded corner structure. It can be understood that the buffer 211, as a key component, is intentionally designed with a chamfered or rounded corner structure in the specific area close to the inner wall of the barrel 3. This design is not arbitrary, but based on multiple considerations and requirements.

[0062] Firstly, from the perspective of safety, the presence of chamfered or rounded corner structure can significantly remove the sharp edges at the contact part of the buffer 211 and the inner wall of the barrel 3. These sharp edges, if not treated, can become potential safety hazards when the gas flows or the system operates, such as exacerbating the wear between components, or in extreme cases, causing stress concentration and thus structural failure. By introducing chamfered or rounded corners, these risks are effectively reduced, thereby ensuring the overall safety and reliability of the system.

[0063] Secondly, from the perspective of gas flow optimization, the chamfered or rounded corner design can make the transition between the buffer 211 and the inner wall of the barrel 3 smoother. This smooth transition helps to reduce the resistance and vortex flow generated when the gas flows through this area, thereby optimizing the flow path of the gas flow and improving the overall efficiency of the system.

[0064] In some embodiments, the buffer 211 and the transmission component 2 are integrally formed. It is understood that, firstly, integral forming ensures a tight fit between the buffer 211 and the transmission component 2, eliminating gaps and looseness issues that may exist in traditional connection methods. This tightness not only improves the mechanical strength and stability of the entire assembly but also effectively reduces noise caused by vibration or impact, enhancing the overall performance of the device and the user experience.

[0065] Secondly, the unibody design simplifies the manufacturing and assembly process of the components. Traditionally, the buffer component 211 and the transmission component 2 may require assembly through welding, bolting, or other complex processes, which not only increases manufacturing costs but may also introduce additional assembly errors. Unibody design avoids these cumbersome steps, directly manufacturing the complete component in one go through processes such as injection molding, casting, or 3D printing, thereby reducing manufacturing costs and improving production efficiency.

[0066] Finally, the one-piece design also enhances the functional synergy between the buffer component 211 and the transmission component 2. Because the two are designed and manufactured as a whole, their interaction and coordination can be controlled more precisely, thereby ensuring the stability and controllability of the gas during the venting process.

[0067] In some embodiments, the buffer 211 is disposed around the transmission member 2. It is understood that the buffer 211 is disposed around the transmission member 2. This arrangement not only enhances the stability of the transmission member 2 and prevents it from being damaged by vibration or impact during operation, but also provides additional support for the transmission member 2 and extends its service life.

[0068] In some embodiments, such as Figure 2 As shown, the transmission component 2 includes a body 21 and a boss 212. The boss 212 protrudes radially from the body 21. The boss 212 and the buffer component 211 are spaced apart. The boss 212, the buffer component 211, and the cylinder 3 enclose a first cavity 213. A pressure relief hole 215 is provided on the boss 212 and communicates with the first cavity 213. It can be understood that the transmission component 2, including the body 21 and the boss 212, is integrally formed. With the axis of the transmission component 2 as the center, the maximum radial dimension of the boss 212 is larger than the maximum radial dimension of the body 21. The boss 212 and the buffer component 211 are spaced apart. The radial dimension of the boss 212 can be the same as the radial dimension of the buffer component 211. The purpose of this design is to facilitate product design and save on manufacturing processes. Figure 3As shown, the boss 212, the buffer 211 and the cylinder body 3 form a first cavity 213, and the pressure relief hole 215 is arranged on the boss 212 and communicates with the first cavity 213. It can be seen that the first cavity 213 extends along the circumference of the cylinder body 3, and the space volume can meet the gas storage after the gas generation unit 1 is discharged. When the high-temperature and high-pressure gas flows into the first cavity 213 from the pressure relief hole 215, it will not impact the buffer 211 at the first time, but will first fill the first cavity 213, greatly increasing the gas flow path and time, and reducing the impact force of the gas contacting the buffer 211, to a certain extent, protecting the buffer 211 and avoiding damage.

[0069] In some embodiments, the pressure relief hole 215 is a stepped hole.

[0070] In some embodiments, the pressure relief hole 215 includes a first hole section and a second hole section in communication, the first hole section is close to the gas generation unit 1, and the cross-sectional area of the first hole section is greater than that of the second hole section.

[0071] It can be understood that the pressure relief hole 215 is ingeniously designed in the form of a stepped hole to meet specific engineering requirements and technical requirements. This design not only reduces the processing difficulty of the pressure relief hole 215, but also optimizes the fluid flow path and improves the stability and reliability of the entire system.

[0072] Specifically, the pressure relief hole 215 includes two hole sections in communication with each other: a first hole section and a second hole section. The first hole section is close to the gas generation unit 1, which undertakes the important task of guiding the gas to flow out of the gas generation unit 1. In order to ensure smooth gas flow and reduce resistance and vortex during the flow process, the cross-sectional area of the first hole section is designed to be relatively large in size.

[0073] The second hole section is connected to the first hole section. Compared with the first hole section, the second hole section has a smaller cross-sectional area. In some embodiments, the diameter of the second hole section can be smaller than that of the first hole section. This design has two main purposes: one is to limit the flow and velocity of the gas by reducing the cross-sectional area of the hole, so as to realize precise control of the gas discharge process; the other is to further reduce the pressure and temperature of the gas by using the throttling effect of the small hole diameter, to ensure that it reaches the safety standard when flowing out of the system.

[0074] The design of the stepped hole not only optimizes the gas flow path, but also improves the stability and reliability of the entire system. By precisely controlling the cross-sectional area size of the first hole section and the second hole section, precise adjustment of the gas discharge process can be realized, thereby ensuring the safety and stability of the system under normal operation and abnormal conditions.

[0075] In some embodiments, as Figure 3As shown, the body 21 has opposite first and second sides 72 and 71, the distance between the first side 72 and the inner wall of the cylinder 3 is greater than the distance between the second side 71 and the inner wall of the cylinder 3, and the pressure relief hole 215 is arranged on the first side 72. That is, the pressure relief hole 215 is arranged on the side of the body 21 where the distance from the cylinder 3 is larger, so that the processing of the pressure relief hole 215 is facilitated, and certain technical requirements are met.

[0076] In some embodiments, the axis of the cylinder 3 is a first axis, the axis of the body 21 is a second axis, the second axis is arranged offset from the first axis, and the pressure relief hole 215 is arranged on the side of the first axis away from the second axis.

[0077] It can be understood that first, we define the axis of the cylinder 3 as the first axis. This axis represents the central axis of the cylinder 3, which is also its geometric symmetry axis. At the same time, the axis of the body 21 is defined as the second axis, which also represents the central axis of the body 21. However, unlike the first axis, the second axis is offset from the first axis by a certain distance. This design allows the cylinder 3 and the body 21 to form a certain angle or offset, thereby meeting certain engineering requirements and technical requirements.

[0078] Improve safety: In some application scenarios, such as the gas generating unit 1, the position of the pressure relief hole 215 is crucial to ensuring the safety of the system. By arranging the pressure relief hole 215 on the side of the first axis away from the second axis, it can be ensured that in the case of overpressure, the gas can be quickly and stably discharged through the pressure relief hole 215 without being hindered by the body 21 or other structures.

[0079] In some embodiments, such as Figure 3 As shown, the pre-tightening device further comprises a seal 5 arranged between the transmission member 2 and the cylinder 3. It can be understood that in the overall structure of the pre-tightening device, the seal 5 plays a crucial role. It is carefully arranged between the transmission member 2 and the cylinder 3 to form a tight sealing interface. The main purpose of this design is to prevent fluid or gas from leaking between the transmission member 2 and the cylinder 3, thereby ensuring the sealing performance and stability of the entire system.

[0080] The material selection of the seal 5 is crucial. It is usually made of materials with excellent elasticity, wear resistance and corrosion resistance, such as rubber, silicone or Teflon, etc. These materials not only have good sealing performance, but also can maintain stable performance in harsh working environment, thereby prolonging the service life of the pre-tightening device.

[0081] In the installation of the seal 5, it is necessary to ensure that it is tightly fitted on the contact surface between the transmission member 2 and the cylinder 3. To achieve this goal, specific installation tools and processes are usually used, such as press-fitting, vulcanization or bonding, etc. These installation methods can ensure that the seal 5 is not damaged during installation and can be tightly fitted on the contact surface to achieve the best sealing effect.

[0082] In addition, the design of the seal 5 also needs to consider the pressure and temperature range it can withstand. In different application scenarios, the tight device may need to withstand different pressure and temperature conditions. Therefore, when designing the seal 5, it is necessary to ensure that it can withstand the expected pressure and temperature range, so as to ensure the safety and stability of the entire system.

[0083] In some embodiments, as shown in Figure 3 The boss 212 is provided with a groove 216, and the seal 5 is arranged in the groove 216. It can be understood that the groove 216 is arranged on the side of the boss 212 close to the gas generating unit 1, and the groove 216 is specially designed on the boss 212. This groove 216 is a carefully calculated geometric shape, and its purpose is to accommodate and fix the seal 5. The depth, width and shape of the groove 216 are designed according to the size and characteristics of the seal 5 to ensure that the seal 5 can be tightly fitted in the groove 216 to form an effective sealing interface.

[0084] In some embodiments, the boss 212 is provided with a stop portion, which is arranged on the side of the groove 216 close to the buffer 211, and the stop portion is used to limit the seal 5. It can be understood that the stop portion can be an independent component or a part of the boss 212, and its shape can be square, rectangular or triangular, mainly to limit the seal 5 and prevent the seal 5 from moving to avoid incomplete sealing.

[0085] In some embodiments, as shown in Figure 2As shown, the pre-tightening device also includes a limiting part 6, which is adapted to cooperate with the transmission member 2 to limit the transmission member 2. It can be understood that the limiting part 6 is provided with an extension part 61, which is adapted to engage the transmission member 2 to fix the position of the transmission member 2 and prevent it from moving. As an important component of the pre-tightening device, its main function is to cooperate with the transmission member 2 to accurately limit the transmission member 2. This limiting action not only ensures the stability and accuracy of the transmission member 2 at the predetermined position, but also prevents the displacement or deviation of the transmission member 2 under the action of external factors such as force or vibration. The design of the limiting part 6 usually takes into account factors such as the size, shape and movement trajectory of the transmission member 2. It can be a protruding pin, a stop block, a buckle or other forms of limiting structure, and the specific shape and size depend on the needs of the overall design. The position and layout of the limiting part 6 are also carefully calculated to ensure that it can provide effective limiting action on the movement trajectory of the transmission member 2. When cooperating with the transmission member 2, the limiting part 6 usually has a certain elasticity or adjustability. This design allows the limiting part 6 to adapt to small changes in the transmission member 2 to some extent while still maintaining its limiting function. For example, in some applications, the limiting part 6 can adopt a spring-loaded design to provide certain buffering and resetting ability when the transmission member 2 is subjected to external force.

[0086] According to the retractor device of the embodiment of the present application, by using the pre-tightening device according to the above embodiment of the present application, one of the core components of the retractor device is the belt reel, which is responsible for storing and releasing safety belts or other types of belts. The design of the belt reel fully considers the needs of the use scenario, and high-strength and wear-resistant materials are used to ensure its stability and durability during long-term use. At the same time, the retractor device also ingeniously integrates the pre-tightening device, which is the key to improving the overall performance. The transmission member 2 in the pre-tightening device is specially configured in the form of a gear, which not only enhances the accuracy and efficiency of transmission, but also makes the structure of the device more compact and reasonable. Through precise transmission cooperation between the gear and the belt reel, efficient transmission and conversion of force are realized.

[0087] The safety belt device, seat and other components and operations of the vehicle according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0088] In understanding the scope of the present application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the stated features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. This concept also applies to like-terms having similar meanings, such as the term "comprising", "having", and their derivatives.

[0089] As used herein, the terms "attached" or "attaching" include a construction wherein an element is directly secured to another element by affixing the element directly to the other element; a construction wherein the element is indirectly secured to the other element by affixing the element to an intermediate member that, in turn, is affixed to the other element; and a construction wherein one element is integral with the other element, i.e., one element is essentially a portion of the other. The definition also includes words of similar import, such as "coupled," "connected," "engaged," "mounted," "attached," "bonded," and derivatives thereof. Finally, terms such as "substantially," "approximately," and "about" mean an acceptable degree of error for the amount disclosed, unless otherwise defined.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The features described herein in one embodiment can be applied to another embodiment, mutatis mutandis, unless the features are not applicable or are otherwise stated.

[0091] The application has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the application, and these modifications and changes all fall within the scope of the application.

Claims

1. A pretensioning device, characterized in that The pre-tightening device comprises: a gas generating unit (1), a cylinder (3); a transmission member (2) disposed at least partially in the cylinder (3), the transmission member (2) being movable under the push of the gas released by the gas generating unit (1), the transmission member (2) being provided with a pressure relief hole (215); a buffer member (211) disposed in the cylinder (3), the buffer member (211) being disposed on the side of the pressure relief hole (215) away from the gas generating unit (1).

2. A pretensioner according to claim 1, characterized in that A gap (214) is formed between the buffer member (211) and the inner wall of the cylinder (3).

3. A pre-tensioner according to claim 2, characterized in that The part of the buffer member (211) close to the inner wall of the cylinder (3) is provided with a chamfered or rounded corner structure.

4. A pretensioner according to claim 1, wherein The buffer member (211) is provided with at least one through hole for gas flow.

5. A pre-tensioner according to claim 1, wherein The buffer member (211) is integrally formed with the transmission member (2).

6. A pretensioner according to claim 1, wherein The buffer member (211) is disposed around the transmission member (2).

7. A pretensioner according to claim 1, wherein The transmission member (2) comprises a body (21) and a boss (212) protruding radially from the body (21), the boss (212) is spaced apart from the buffer member (211), the boss (212), the buffer member (211) and the cylinder (3) form a first cavity (213), the pressure relief hole (215) is disposed on the boss (212), and the pressure relief hole (215) is in communication with the first cavity (213).

8. A pretensioner according to claim 7, characterized in that The pressure relief hole (215) is a stepped hole.

9. A pre-tensioner according to claim 8, characterized in that The pressure relief hole (215) comprises a first hole section and a second hole section in communication, the first hole section is close to the gas generating unit (1), and the cross-sectional area of the first hole section is greater than that of the second hole section.

10. A pretensioner according to claim 7, wherein The body has opposite first and second sides (72) and (71), the distance between the first side (72) and the inner wall of the cylinder is greater than the distance between the second side (71) and the inner wall of the cylinder, and the pressure relief hole is disposed on the first side (72).

11. A pretensioner according to claim 7, wherein The pre-tightening device further comprises a sealing member (5) disposed between the transmission member (2) and the cylinder (3).

12. A pretensioner according to claim 11, characterized in that The boss (212) is provided with a groove (216), and the sealing member (5) is disposed in the groove (216).

13. A pretensioner according to claim 12, characterized in that The boss (212) is provided with a stop portion disposed on the side of the groove (216) close to the buffer member (211), and the stop portion is used for limiting the sealing member (5).

14. A pretensioner according to claim 1, wherein Further comprising a limiting portion (6) adapted to cooperate with the transmission member (2) to limit the transmission member (2).

15. A retractor device characterized by, At least comprising a tape reel and the pre-tightening device of any one of claims 1-13, the transmission member (2) is configured as a gear, and the gear is in transmission cooperation with the tape reel.

16. A seatbelt device, characterized in that, At least comprising a webbing and the retractor device of claim 15.

17. A seat, characterized by The seat comprises a seat body and the safety belt device of claim 16.

18. A vehicle characterized by comprising: The vehicle comprises a vehicle body and the seat of claim 17.

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