Sealing structure, pre-tightening mechanism, pre-tensioning device, safety belt assembly and vehicle

Abstract

The invention discloses a sealing structure which is applied to a safety belt assembly, the safety belt assembly comprises a pre-tightening pipe, the sealing structure comprises at least one sealing element, the sealing element is arranged in the pre-tightening pipe, the sealing element comprises a first lip edge, and the first lip edge is suitable for being tightly attached to the inner wall of the pre-tightening pipe to achieve sealing after being deformed. The sealing performance of the safety belt can be remarkably enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of safety belts, and in particular to a sealing structure, a pre-tightening mechanism, a pre-tensioning device, a safety belt assembly and a vehicle. Background Art

[0002] Seatbelts are an indispensable safety device in modern vehicles. Their primary function is to protect occupants by limiting their displacement and reducing the impact force during a collision. The pretensioner is a key component of the seatbelt assembly, rapidly tightening the belt in a collision, further enhancing its protective effectiveness. However, existing pretensioner mechanisms suffer from poor sealing performance. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a sealing structure that can significantly enhance the sealing performance of a seat belt assembly.

[0004] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention proposes a sealing structure, which is applied to a seat belt assembly, wherein the seat belt assembly includes a pre-tensioning tube, and is characterized in that: the sealing structure includes at least one sealing element, the sealing element is arranged in the pre-tensioning tube, and the sealing element includes a first lip edge, which is suitable for tightly contacting the inner wall of the pre-tensioning tube to achieve sealing after deformation.

[0006] In one embodiment, the sealing element further includes a second lip, wherein the second lip is connected to the first lip, and after deformation, the second lip is adapted to be in close contact with the transmission device in the preload tube to achieve sealing.

[0007] In one embodiment, the first lip has a first surface away from the preload tube, the second lip has a second surface away from the transmission device, and an angle A is formed between the first surface and the second surface, and the angle A is an acute angle.

[0008] In one embodiment, the angle A is 30° to 60°.

[0009] In one embodiment, 5. the second lip has an angle B with the first direction, the first lip has an angle C with the first direction, and the angle B is greater than the angle C;

[0010] The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

[0011] In one embodiment, in a direction perpendicular to the first direction, a thickness of at least a portion of the second lip is greater than a thickness of the first lip.

[0012] The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

[0013] In one embodiment, the sealing element further includes a guide portion, and the second lip and the first lip are connected via the guide portion.

[0014] In one embodiment, the first lip is annular, and / or the second lip is annular, and / or the guide portion is annular.

[0015] In one embodiment, the first lip and the second lip are connected to form a groove.

[0016] In one embodiment, the sealing structure includes a first sealing element and a second sealing element, and at least a portion of the first sealing element is arranged in a groove of the second sealing element so that the first lip of the second sealing element is deformed to fit tightly against the inner wall of the preload tube to achieve sealing.

[0017] In one embodiment, the second sealing element further includes a second lip, and at least a portion of the first sealing element is disposed in a groove of the second sealing element so that the second lip of the second sealing element is deformed to fit tightly against the transmission device in the preload tube to achieve sealing.

[0018] In one embodiment, the first sealing element further includes a guide portion, and the guide portion of the first sealing element is at least partially disposed in the groove of the second sealing element.

[0019] In one embodiment, the first lip of the sealing element has a first surface away from the inner wall of the preload tube, and the second lip of the sealing element has a second surface away from the transmission device;

[0020] In a direction perpendicular to the first direction, the distance between the inner side and the outer side of the guide portion is X, the distance between the first surface and the second surface is Y, and the minimum value of the distance X is greater than the minimum value of the distance Y.

[0021] The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

[0022] In one embodiment, the distance X gradually decreases along the direction from the first sealing element to the second sealing element.

[0023] In one embodiment, the inner side surface and the outer side surface of the guide portion have an included angle D, the first surface and the second surface have an included angle A, and the included angle D is greater than the included angle A.

[0024] In one embodiment, the difference between the angle D and the angle A is less than or equal to 10°.

[0025] In one embodiment, 17, the first lip of the sealing element has a third surface close to the preload tube, and the second lip of the sealing element has a fourth surface close to the transmission device.

[0026] In a direction perpendicular to the first direction, a distance between an inner side surface and an outer side surface of the guide portion is X, and a distance between the third surface and the fourth surface is greater than X.

[0027] The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

[0028] In one embodiment, a transition surface is provided at the connection between the first lip of the first sealing element and the guide portion of the first sealing element, and the transition surface is suitable for fitting with the top surface of the first lip of the second sealing element.

[0029] In one embodiment, in the first direction, the length of the guide portion of the sealing element is less than or equal to the length of the first lip, and / or the length of the guide portion of the sealing element is less than or equal to the length of the second lip;

[0030] The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

[0031] In a second aspect, the present invention further provides a pre-tightening mechanism, comprising the sealing structure as described in the first aspect.

[0032] In one embodiment, the pre-tightening mechanism further includes a pre-tightening tube and a transmission device, the sealing structure and the transmission device are arranged in the pre-tightening tube, and the transmission device is passed through the sealing structure.

[0033] In one embodiment, the pre-tightening mechanism further includes a fixing element to fix the sealing structure.

[0034] In a third aspect, the present invention further provides a pre-tensioning device, comprising the sealing structure as described in the first aspect, or the pre-tensioning mechanism as described in the second aspect.

[0035] In one embodiment, the pre-tensioning device further includes a webbing assembly, the transmission device is connected to the webbing assembly, and the pre-tensioning mechanism drives the webbing tissue to rewind through the transmission device.

[0036] In a fourth aspect, the present invention further provides a seat belt assembly, comprising the sealing structure as described in the first aspect, or the pretensioning mechanism as described in the second aspect, or the pretensioning device as described in the third aspect.

[0037] In a fifth aspect, the present invention further provides a vehicle comprising the sealing structure as described in the first aspect, or the pretensioning mechanism as described in the second aspect, or the pretensioning device as described in the third aspect, or the seat belt assembly as described in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 is a cross-sectional view of a sealing structure of an embodiment;

[0040] Figure 2 is a cross-sectional view of a sealing structure from perspective AA according to another embodiment;

[0041] Figure 3 This is a schematic diagram of a sealing structure of an embodiment;

[0042] Figure 4 is a schematic diagram of a sealing structure of another embodiment;

[0043] Figure 5 is a cross-sectional view of a pre-tightening mechanism according to an embodiment;

[0044] Figure 6 This is a schematic diagram of the overall structure of a pre-tensioning device according to an embodiment.

[0045] Description of reference numerals:

[0046] 1-sealing structure, 11-sealing element, 12-first lip, 121-first surface, 122-third surface, 13-second lip, 131-second surface, 132-fourth surface, 14-guide portion, 15-groove, 16-transition surface;

[0047] 21-first sealing element, 22-second sealing element;

[0048] 3- preload mechanism, 31- preload tube, 32- transmission device, 33- fixing element;

[0049] 4-pretensioning device, 41-webbing assembly;

[0050] A-the angle between the first surface and the second surface, B-the angle between the second lip and the first direction, C-the angle between the first lip and the first direction, D-the angle between the inner side surface of the guide portion and the outer side surface of the guide portion;

[0051] X is the distance between the inner side surface of the guide portion and the outer side surface of the guide portion, and Y is the distance between the first surface and the second surface. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0056] The present invention provides a sealing structure 1, which is applied to a safety belt assembly. The safety belt assembly includes a pre-tensioning tube, such as Figure 1 、 Figure 2 and Figure 3As shown, the sealing structure 1 includes at least one sealing element 11, which is arranged in the preload tube. The sealing element 11 includes a first lip, which is suitable for being tightly attached to the inner wall of the preload tube after deformation to achieve sealing. The first lip is an important component of the sealing element 11, and its shape is an annular structure. The specific shape can be adjusted according to the shape of the inner wall of the preload tube. When the seat belt assembly is working, the compressed gas or mechanical movement inside the preload tube will cause the sealing element 11 to deform. After deformation, the first lip can be tightly attached to the inner wall of the preload tube, thereby achieving sealing. This deformation can be achieved through elastic deformation of the elastic material, ensuring the reliability and durability of the sealing effect. The sealing element 11 can be made of elastic material, such as rubber or silicone, to ensure that it has good deformation ability and elastic recovery ability, and can maintain a good sealing effect after multiple deformations.

[0057] In the related art, a spherical element is usually provided in the pre-tensioning tube in the seat belt to achieve a sealing effect, but relying solely on the spherical element has the risk of failure. When the pre-tensioning tube is a curved tube, the spherical element will not produce deformation to adapt to the inner wall of the pre-tensioning tube, and it is easy to leak. When the pre-tensioning tube is a curved tube, the first lip edge in the sealing structure 1 of the present application will produce deformation to adapt to the inner wall of the pre-tensioning tube, and will still be close to the inner wall of the pre-tensioning tube, with a good sealing effect.

[0058] When a vehicle collides, two pressure difference spaces are formed inside the preload tube by the sealing element 11. The pressure in the space on the side of the sealing element 11 close to the high-pressure gas inlet is higher, and the pressure in the space on the side of the sealing element 11 away from the high-pressure gas inlet is lower. The pressure difference causes the sealing element 11 to move from the high-pressure space to the low-pressure space, thereby driving the transmission device to move and ultimately achieve the preload function.

[0059] In one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the sealing element 11 also includes a second lip, which is connected to the first lip to form an integral structure. After deformation, the second lip is suitable for tightly fitting with the transmission device in the preload tube to achieve sealing. The shape of the second lip can be designed according to the shape of the transmission device, and is usually an annular structure. The second lip is arranged on the inner side of the first lip. When the seat belt assembly is working, the compressed gas or mechanical movement inside the preload tube will cause the sealing element 11 to deform, and the second lip will tightly fit the surface of the transmission device after deformation, thereby achieving sealing. When the surface of the transmission device is not smooth, the second lip will deform to adapt to the surface of the transmission device, and the second lip will still be tightly fitted to the surface of the transmission device, with a good sealing effect.

[0060] Specifically, the first lip is deformed to fit tightly against the inner wall of the preload tube, and the second lip is deformed to fit tightly against the surface of the transmission device, thereby achieving double sealing.

[0061] In one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the first lip has a first surface away from the preload tube, and the second lip has a second surface away from the transmission device. An angle A is formed between the first and second surfaces, and angle A is an acute angle. When the first or second surface is a curved surface, the angle is the angle in the tangent direction of the first or second surface. Angle A is designed to be an acute angle. When the sealing element 11 is impacted by compressed gas or mechanical movement, the impact force on the first lip in the first direction is reduced, the component force on the second lip in the first direction is reduced, and the probability of separation between the sealing element 11 and the transmission device is reduced. The second lip can better fit the surface of the transmission device, thereby achieving a tighter seal.

[0062] The first direction is the axial direction of the preload tube, or the tangential direction of the contact point between the preload tube wall and the first lip. When the preload tube is straight, the first direction is the axial direction of the preload tube; when the preload tube is curved, the first direction is the tangential direction of the contact point between the preload tube wall and the first lip.

[0063] In one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the angle A is 30° to 60°. When the angle A is set in the range of 30° to 60°, the probability of separation between the sealing element 11 and the transmission device can be significantly reduced, and the second lip and the surface of the transmission device can be more closely fitted, thereby achieving a better sealing effect.

[0064] In one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the second lip forms an angle B with the first direction, and the first lip forms an angle C with the first direction, wherein angle B is greater than angle C. Angle B is set to be greater than angle C, so that the pressure exerted on the second lip in the direction perpendicular to the first direction is greater, so that the second lip is more closely fitted to the surface of the transmission device, thereby enhancing the fit between the sealing element 11 and the transmission device.

[0065] In one embodiment, Figure 1 、 Figure 2 As shown, in a direction perpendicular to the first direction, at least a portion of the second lip has a thickness greater than that of the first lip. Setting the thickness of at least a portion of the second lip greater than that of the first lip can make the second lip more wear-resistant, thereby improving durability and extending life when used in conjunction with a transmission device.

[0066] In one embodiment, Figure 1 、 Figure 2 and Figure 3As shown, the sealing element 11 also includes a guide portion, through which the second lip and the first lip are connected. The shape of the guide portion can be designed according to the internal structure of the preload tube and is generally annular. The size and shape of the guide portion must ensure that the sealing element 11 can be smoothly guided into the preload tube during installation and maintain a stable position of the sealing element 11 during operation. The guide portion is made of an elastic material, such as rubber or silicone. This material has excellent elastic deformation ability and wear resistance, ensuring that the sealing element 11 maintains good sealing performance after multiple deformations.

[0067] In one embodiment, Figure 3 As shown, the first lip is annular, and / or the second lip is annular, and / or the guide portion is annular. The first lip, the second lip and the guide portion can be annular structures individually or all of them. The second lip is sleeved in the first lip. The first lip is designed as an annular structure to ensure that the sealing element 11 can fit tightly against the inner wall of the preload tube to form a complete sealing ring. The second lip is designed as an annular shape to fit tightly against the surface of the transmission device to form another complete sealing ring, thereby achieving an all-round sealing effect. The guide portion is designed as an annular shape to be evenly distributed inside the preload tube to ensure that the sealing element 11 maintains a stable position during installation and operation. The annular guide portion can also provide uniform support during deformation to prevent the sealing element 11 from twisting or shifting.

[0068] In one embodiment, Figure 1 and Figure 3 As shown, the first lip and the second lip connect to form a groove. The first lip forms the first wall of the groove, and the second lip forms the second wall of the groove. The first wall is closer to the preload tube wall than the second wall. The connection between the first and second lips forms the bottom wall of the groove. The groove typically absorbs the impact force caused by compressed gas or mechanical movement, causing the first and second lips to deform to fit the preload tube and transmission device, achieving a sealing effect.

[0069] In one embodiment, Figure 2 and Figure 4 As shown, the sealing structure 1 includes a first sealing element and a second sealing element. At least a portion of the first sealing element is disposed within a groove of the second sealing element, so that the first lip of the second sealing element deforms and fits tightly against the inner wall of the preload tube, thereby achieving a seal. The placement of at least a portion of the first sealing element within the groove of the second sealing element compresses the first lip of the second sealing element, causing the first lip of the second sealing element to deform. After deformation, the first lip of the second sealing element can fit tightly against the inner wall of the preload tube, thereby achieving a seal.

[0070] The connection between the first and second sealing elements creates a pressure differential with other spaces. This pressure is lower than the pressure of the high-pressure gas provided by the power element, but higher than the pressure at the connection between the preload tube and the air, forming multiple pressure differential spaces. The pressure in these pressure differential spaces decreases as the distance from the high-pressure gas increases. As the first sealing element approaches the high-pressure gas, it moves away from the high-pressure gas due to the pressure differential, squeezing the first and second sealing elements against each other. This causes the guide portion of the first sealing element to move along the first and second surfaces of the second sealing element, squeezing and deforming the first and second lips of the second sealing element, forcing it to adhere tightly to the preload tube and transmission device, achieving a seal.

[0071] In one embodiment, Figure 2 and Figure 4 As shown, the second sealing element further includes a second lip of the second sealing element. At least a portion of the first sealing element is disposed within the groove of the second sealing element, so that the second lip of the second sealing element, after deformation, is adapted to closely contact the transmission device within the preload tube to achieve sealing. The placement of at least a portion of the first sealing element within the groove of the second sealing element compresses the second lip of the second sealing element, causing the second lip of the second sealing element to deform. After deformation, the second lip of the second sealing element can closely contact the inner wall of the preload tube, thereby achieving sealing.

[0072] One embodiment, such as Figure 2 and Figure 4 As shown, the first sealing element further includes a guide portion, at least a portion of which is disposed within the groove of the second sealing element. This placement of at least a portion of the guide portion within the groove of the second sealing element compresses the groove of the second sealing element, causing the first and second lips of the second sealing element to deform and conform to the inner wall of the preload tube and the surface of the transmission device, thereby achieving a seal. Simultaneously, the first and second lips of the first sealing element can also deform due to the impact force of compressed gas or mechanical movement, conforming to the inner wall of the preload tube and the surface of the transmission device.

[0073] One embodiment, such as Figure 1 and Figure 2As shown, the first lip of sealing element 11 has a first surface facing away from the preload tube, and the second lip of sealing element 11 has a second surface facing away from the transmission device. In a direction perpendicular to the first direction, the distance between the inner side surface of the guide portion of the first sealing element and the outer side surface of the guide portion of the first sealing element is X, and the distance between the first surface of the second sealing element and the second surface of the second sealing element is Y. The minimum value of distance X is greater than the minimum value of distance Y, and the minimum value of distance X is less than the maximum value of distance Y. This design ensures that the guide portion of the first sealing element is sized to smoothly enter the groove of the second sealing element, squeezing the groove of the second sealing element to deform the first and second lips of the second sealing element, thereby achieving the sealing function.

[0074] One embodiment, such as Figure 1 and Figure 2 As shown, the distance X gradually decreases from the first sealing element to the second sealing element. This design allows the outer and inner side surfaces of the guide portion of the first sealing element to evenly squeeze the first and second lips of the second sealing element, enhancing the fit and sealing performance between the guide portion of the first sealing element and the first and second lips of the second sealing element, thereby preventing high-pressure gas from entering the groove of the second sealing element.

[0075] One embodiment, such as Figure 1 and Figure 2 As shown, the inner side surface of the guide portion of the first sealing element and the outer side surface of the guide portion of the first sealing element form an included angle D, and the first surface of the first sealing element and the second surface of the first sealing element form an included angle A, with the included angle D being greater than the included angle A. This design enables the outer and inner side surfaces of the guide portion of the first sealing element to evenly squeeze the first and second lips of the second sealing element, thereby enhancing the fit and sealing performance between the guide portion of the first sealing element and the first and second lips of the second sealing element, thereby preventing high-pressure gas from entering the groove of the second sealing element.

[0076] One embodiment, such as Figure 1 and Figure 2 As shown, the difference between angle D and angle A is less than or equal to 10°. This design allows the guide portion of the first sealing element to move smoothly within the groove of the second sealing element, while ensuring the fit and sealing between the guide portion of the first sealing element and the first and second lips of the second sealing element, thereby preventing high-pressure gas from entering the groove of the second sealing element.

[0077] In one embodiment, Figure 1 and Figure 2As shown, the first lip has a third surface proximate to the preload tube, and the second lip has a fourth surface proximate to the transmission device. In a direction perpendicular to the first direction, the distance between the inner side surface of the guide portion of the first sealing element and the outer side surface of the guide portion of the first sealing element is X, and the distance between the third surface of the first sealing element and the fourth surface of the first sealing element is greater than X. The guide portion of the first sealing element is interference-fitted within the groove of the second sealing element. This design ensures that the distance between the third surface and the fourth surface is greater than the distance X. The first and second lips of the first sealing element will not enter the groove of the second sealing element, thereby not affecting the deformation of the first and second lips of the first sealing element to fit the preload tube and the transmission device.

[0078] In one embodiment, Figure 1 and Figure 3 As shown, a transition surface is provided at the junction of the first lip of the first sealing element and the guide portion of the first sealing element. This transition surface is adapted to mate with the top surface of the first lip of the second sealing element. This design ensures a tight fit between the transition surface and the first lip of the second sealing element, further preventing high-pressure gas from entering the groove of the second sealing element.

[0079] In one embodiment, Figure 1 and Figure 2 As shown, in the first direction, the length of the guide portion of the sealing element 11 is less than or equal to the length of the first lip, and / or the length of the guide portion of the sealing element 11 is less than or equal to the length of the second lip. This design allows the guide portion of the first sealing element to fully enter the groove of the second sealing element, thereby achieving a sealing fit between the transition surface and the first lip of the second sealing element.

[0080] Through the above design, after the first sealing element in the sealing structure 1 is impacted by high-pressure gas or mechanical movement, the first lip and the second lip of the first sealing element are deformed and tightly adhere to the pre-tightening pipe wall and the transmission device. At the same time, due to the pressure difference, they move toward the direction of low pressure to drive the transmission device to move and realize the pre-tightening function. The angle A of the first sealing element is set to 30°~60°, and the angle B is set to be greater than C, which can effectively improve the tightness between the second lip and the transmission device and prevent the second lip from detaching from the transmission device. The sealing structure 1 also includes a second sealing element. The guide portion of the first sealing element is set in the groove of the second sealing element, squeezing the first lip and the second lip of the second sealing element to deform and tightly adhere to the pre-tightening pipe wall and the transmission device to achieve double sealing. The minimum value of distance X is greater than the minimum value of distance Y, the minimum value of distance X is less than the maximum value of distance Y, the distance X close to the second sealing element is less than the distance X far from the second sealing element, and the difference between angle D and angle A is less than or equal to 10°. This design enables the guide portion of the first sealing element to move smoothly within the groove of the second sealing element, and ensures the fit and sealing between the guide portion of the first sealing element and the first and second lips of the second sealing element, so as to prevent high-pressure gas from entering the groove of the second sealing element. The length of the guide portion of the sealing element 11 is less than or equal to the length of the first and second lips, and the transition surface is suitable for fitting with the top surface of the first lip of the second sealing element. This design allows the guide portion of the first sealing element to fully enter the groove of the second sealing element, while the transition surface and the first lip of the second sealing element are sealed and fitted, further preventing high-pressure gas from entering the groove of the second sealing element. The area where the transition surface connects to the preload tube wall creates a pressure differential with other spaces. This pressure is lower than the pressure of the high-pressure gas provided by the power element, but higher than the pressure at the connection between the preload tube and the air, creating multiple pressure differential spaces. The pressure in these pressure differential spaces decreases as the distance from the high-pressure gas increases. The first sealing element is closer to the high-pressure gas. Due to the pressure differential, the first sealing element moves away from the high-pressure gas. The first and second sealing elements squeeze each other, causing the guide portion of the first sealing element to move along the first and second surfaces of the second sealing element. This simultaneously compresses and deforms the first and second lips of the second sealing element, forcing them to adhere tightly to the preload tube and the transmission device, achieving a seal. Under the pressure differential, the first and second sealing elements move together toward the lower-pressure space, thereby driving the transmission device to achieve the preload function. When the sealing structure 1 has three or more sealing elements 11, the principle remains the same: multiple pressure differential spaces are formed between the multiple sealing structures 1. The pressure differential drives the sealing structure 1 toward the lower-pressure space, thereby driving the transmission device to achieve the preload function.

[0081] The embodiment of the present invention further provides a pre-tightening mechanism, such as Figure 5 As shown, it includes the sealing structure 1 as mentioned above.

[0082] In one embodiment, Figure 5 As shown, the pre-tightening mechanism further includes a pre-tightening tube and a transmission device, the sealing structure 1 and the transmission device are arranged in the pre-tightening tube, and the transmission device is arranged in the sealing structure 1. This design allows the sealing structure 1 to drive the transmission device to move when it moves to achieve the pre-tightening function.

[0083] In one embodiment, Figure 5 As shown, the pre-tightening mechanism further includes a fixing element to fix the sealing structure 1. The fixing element is connected to the transmission device, and the sealing structure 1 pushes the fixing element to move in the direction of lower pressure, and the fixing element drives the transmission device to move together to achieve the pre-tightening function.

[0084] The embodiment of the present invention also provides a pre-tensioning device, such as Figure 6 As shown, it includes the aforementioned sealing structure 1, or the aforementioned pre-tightening mechanism.

[0085] In one embodiment, Figure 6 As shown, the pretensioning device also includes a webbing assembly, which is connected to a transmission device. The pretensioning mechanism drives the webbing tissue back through the transmission device. The fixed element drives the transmission device to move, which in turn drives the reel to rotate. The reel drives the webbing assembly to rewind the webbing, ultimately performing the pretensioning function of the recovered webbing.

[0086] An embodiment of the present invention further provides a seat belt assembly, comprising the aforementioned sealing structure 1, or the aforementioned pre-tensioning mechanism, or the aforementioned pre-tensioning device.

[0087] An embodiment of the present invention further provides a vehicle, comprising the aforementioned sealing structure 1, or the aforementioned pre-tensioning mechanism, or the aforementioned pre-tensioning device, or the aforementioned seat belt assembly.

[0088] For the above-mentioned pre-tensioning mechanism, pre-tensioning device, seat belt assembly, and vehicle embodiments, they include the aforementioned sealing structure and can achieve the same technical effects. To avoid repetition, they will not be described here. For relevant matters, please refer to the partial description of the sealing structure embodiment.

[0089] Other components and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0090] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0091] In the description of the present invention, “on”, “above” and “above” a first feature of a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0092] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0093] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0094] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A sealing structure, applied to a seat belt assembly, wherein the seat belt assembly includes a pre-tensioning tube, characterized in that: The sealing structure includes at least one sealing element, which is arranged in the preload tube. The sealing element includes a first lip edge, which is suitable for tightly contacting the inner wall of the preload tube to achieve sealing after deformation.

2. The sealing structure according to claim 1, wherein: The sealing element further comprises a second lip edge, wherein the second lip edge is connected to the first lip edge, and after deformation, the second lip edge is adapted to be in close contact with the transmission device in the preload tube to achieve sealing.

3. The sealing structure according to claim 2, wherein: The first lip has a first surface away from the preload tube, the second lip has a second surface away from the transmission device, an angle A is formed between the first surface and the second surface, and the angle A is an acute angle.

4. The sealing structure according to claim 3, wherein: The angle A is 30° to 60°.

5. The sealing structure according to claim 2, wherein: The second lip forms an angle B with the first direction, the first lip forms an angle C with the first direction, and the angle B is greater than the angle C; The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

6. The sealing structure according to claim 2, wherein: In a direction perpendicular to the first direction, the thickness of at least a portion of the second lip is greater than the thickness of the first lip; The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

7. The sealing structure according to claim 2, wherein: The sealing element further includes a guide portion, and the second lip and the first lip are connected by the guide portion.

8. The sealing structure according to claim 7, wherein: The first lip is annular, and / or the second lip is annular, and / or the guide portion is annular.

9. The sealing structure according to claim 2, wherein: The first lip edge and the second lip edge are connected to form a groove.

10. The sealing structure according to claim 9, characterized in that: The sealing structure includes a first sealing element and a second sealing element. At least part of the first sealing element is arranged in the groove of the second sealing element, so that the first lip of the second sealing element is deformed to fit tightly against the inner wall of the preload tube to achieve sealing.

11. The sealing structure according to claim 10, wherein: The second sealing element further includes a second lip, and at least a portion of the first sealing element is disposed in a groove of the second sealing element so that the second lip of the second sealing element is deformed to fit tightly against the transmission device in the preload tube to achieve sealing.

12. The sealing structure according to claim 11, characterized in that: The first sealing element further includes a guide portion, and the guide portion of the first sealing element is at least partially disposed in the groove of the second sealing element.

13. The sealing structure according to claim 12, wherein: The first lip of the sealing element has a first surface away from the inner wall of the preload tube, and the second lip of the sealing element has a second surface away from the transmission device; In a direction perpendicular to the first direction, the distance between the inner side surface and the outer side surface of the guide portion is X, the distance between the first surface and the second surface is Y, and the minimum value of the distance X is greater than the minimum value of the distance Y; The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

14. The sealing structure according to claim 13, wherein: The distance X gradually decreases along a direction from the first sealing element to the second sealing element.

15. The sealing structure according to claim 13, wherein: The inner side surface and the outer side surface of the guide portion have an included angle D, the first surface and the second surface have an included angle A, and the included angle D is greater than the included angle A.

16. The sealing structure according to claim 15, characterized in that: The difference between the angle D and the angle A is less than or equal to 10°.

17. The sealing structure according to claim 12, wherein: The first lip of the sealing element has a third surface close to the preload tube, and the second lip of the sealing element has a fourth surface close to the transmission device. In a direction perpendicular to the first direction, the distance between the inner side surface and the outer side surface of the guide portion is X, and the distance between the third surface and the fourth surface is greater than X; The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

18. The sealing structure according to claim 17, wherein: A transition surface is provided at the connection between the first lip of the first sealing element and the guide portion of the first sealing element. The transition surface is suitable for fitting with the top surface of the first lip of the second sealing element.

19. The sealing structure according to claim 7, wherein: In the first direction, the length of the guide portion of the sealing element is less than or equal to the length of the first lip, and / or the length of the guide portion of the sealing element is less than or equal to the length of the second lip; The first direction is the axial direction of the preload tube, or the first direction is the tangential direction of the contact position between the preload tube wall and the first lip.

20. A pre-tightening mechanism, characterized in that: The sealing structure comprises the sealing structure according to any one of claims 1 to 19.

21. The pre-tightening mechanism according to claim 20, characterized in that: The pre-tightening mechanism further includes a pre-tightening tube and a transmission device. The sealing structure and the transmission device are arranged in the pre-tightening tube, and the transmission device is passed through the sealing structure.

22. The pre-tightening mechanism according to claim 21, characterized in that: The pre-tightening mechanism further includes a fixing element for fixing the sealing structure.

23. A pre-tensioning device, characterized in that: It includes the sealing structure described in any one of claims 1 to 19, or the pre-tightening mechanism described in any one of claims 20 to 22.

24. The pretensioning device according to claim 23, characterized in that: The pre-tensioning device further comprises a webbing assembly, the transmission device is connected to the webbing assembly, and the pre-tensioning mechanism drives the webbing tissue to rewind through the transmission device.

25. A seat belt assembly, characterized in that: It comprises the sealing structure according to any one of claims 1 to 19, or the pretensioning mechanism according to any one of claims 20 to 22, or the pretensioning device according to any one of claims 23 to 24.

26. A vehicle, characterized in that: It comprises the sealing structure according to any one of claims 1 to 19, or the pretensioning mechanism according to any one of claims 20 to 22, or the pretensioning device according to any one of claims 23 to 24, or the seat belt assembly according to claim 25.

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