A seat belt arrangement, vehicle seat assembly, and vehicle

Abstract

The application discloses a safety belt device, a vehicle seat assembly and a vehicle, which comprises a belt body, a first locking member, a second locking member connected to the belt body and detachably connected with the first locking member, and an adjusting mechanism arranged between the belt body and the second locking member or on the belt body, the adjusting mechanism having a first state and a second state, in the first state, the intersection of the shoulder belt and the waist belt is located at a first position, and in the second state, the intersection of the shoulder belt and the waist belt is moved to a second position; the first position and the second position are located between a first side and a second side, and the distance between the first position and the first locking member is smaller than the distance between the second position and the first locking member. The intersection of the shoulder belt and the waist belt of the safety belt device can be moved from the first position close to the first locking member to the second position away from the first locking member, so that the risk of neck compression of the safety belt in the case of a vehicle collision in a non-driving state or an intelligent driving state is reduced, and the use safety of the safety belt device is improved.

Description

Technical Field

[0001] This application belongs to the field of vehicle technology, specifically relating to a seat belt device, a vehicle seat assembly, and a vehicle. Background Technology

[0002] To effectively protect occupants in the event of a collision, vehicle seat assemblies are typically equipped with seat belts. Among these, the three-point seat belt is a common type of seat belt.

[0003] For smart cockpits, in order to ensure comfort, occupants will adjust the vehicle seat assembly to a reclining position when not driving or in smart driving mode. In this case, if a collision occurs, the occupants will slide forward, causing the shoulder straps to move laterally, which may lead to the risk of strangulation and thus affect the safety of the seat belt device. Summary of the Invention

[0004] This application aims to provide a seat belt device, a vehicle seat assembly, and a vehicle that at least addresses the problem of seat belt devices posing a risk of strangulation, thereby affecting safety during use.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide a seat belt device applied to a vehicle seat assembly, the vehicle seat assembly having a first side and a second side disposed opposite to each other along its width direction, the seat belt device comprising: A belt, the two ends of which are used to connect to the first side; A first locking element is used to connect to the second side; The second locking member is connected to the belt body and detachably connected to the first locking member. When the second locking member is connected to the first locking member, the belt body includes a shoulder strap for restraining the occupant's chest and a waist belt for restraining the occupant's waist. An adjustment mechanism is provided, disposed between the belt body and the second locking member, or disposed on the belt body. The adjustment mechanism has a first state and a second state. In the first state, the intersection of the shoulder strap and the waist belt is located at a first position. In the second state, the intersection of the shoulder strap and the waist belt is located at a second position. The first position and the second position are located between the first side and the second side, and the distance between the first position and the first locking member is less than the distance between the second position and the first locking member.

[0006] Optionally, the adjustment mechanism includes: a first adjustment member, which is disposed between the belt body and the second locking member and connected to the belt body and the second locking member, the first adjustment member having a first length and a second length, and the second length being greater than the first length; In the first state, the first adjustment member remains at the first length so that the intersection of the shoulder strap and the waist belt is located at the first position. In the second state, the first adjustment member switches to the second length so that the intersection of the shoulder strap and the waist belt moves to the second position.

[0007] Optionally, the first adjusting member includes at least two stacked adjusting parts, and adjacent adjusting parts are connected; The fracture strength at the connection between two adjacent adjustment parts is less than the fracture strength of the adjustment part. In the first state, the two adjacent adjustment parts remain connected. In the second state, the connection between the two adjacent adjustment parts breaks, so that the first adjustment member switches from the first length to the second length. Alternatively, the first adjusting member may further include a first cut-off device disposed on the second locking member, the first cut-off device being used to cut off the connection between at least two of the adjusting parts, so that the first adjusting member switches from the first length to the second length; Alternatively, the adjustment mechanism may further include a second retractor for winding or releasing the first adjustment member to switch the first adjustment member between the first length and the second length.

[0008] Optionally, the adjustment mechanism further includes: a first guide member, which is sleeved on the belt and slidably connected to the belt; The end of the first adjusting member that is away from the second locking member is connected to the first guide member.

[0009] Optionally, the adjustment mechanism includes: at least one second adjustment member, and the second locking member is connected to one of the second adjustment members; In the first state, both ends of the second adjustment member are connected to the belt body, and the belt body partially overlaps or the belt body partially overlaps with the second adjustment member, so that the intersection of the shoulder strap and the waist belt is located in the first position; in the second state, at least one end of the second adjustment member is disconnected from the belt body, and the overlapping portion of the belt body or the overlapping portion of the belt body and the second adjustment member is at least partially released, so that the intersection of the shoulder strap and the waist belt moves to the second position.

[0010] Optionally, the second adjusting member includes a first sub-adjusting member, which includes a first end and a second end that are opposite to each other, and the second end is fixedly connected to the belt body; In the first state, the first end is connected to the belt body and is close to the upper end of the belt body so that the belt body partially overlaps with the first sub-adjustment. In the second state, the first end is disconnected from the belt body so that the portion of the belt body overlapping with the first sub-adjustment is released.

[0011] Optionally, the second adjusting member includes a second sub-adjusting member and a third sub-adjusting member. The second sub-adjusting member includes a third end and a fourth end that are opposite to each other. The third sub-adjusting member includes a fifth end and a sixth end that are opposite to each other. The fifth end is located between the third end and the fourth end, and the fourth end is located between the fifth end and the sixth end. The second locking member is connected to the second sub-adjusting member. In the first state, the third end, the fourth end, and the fifth end are movably connected to the belt body, and the sixth end is fixedly connected to the belt body. The third end and the fifth end are close to the upper end of the belt body so that the belt body partially overlaps. In the second state, the third end is disconnected from the belt body, so that the overlapping portion of the belt body is at least partially released.

[0012] Optionally, the second adjusting member includes a second sub-adjusting member and a third sub-adjusting member disposed on opposite sides of the belt body. The second sub-adjusting member includes a third end and a fourth end that are opposite to each other, and the third sub-adjusting member includes a fifth end and a sixth end that are opposite to each other. The second locking member includes a latch body and a connecting strip connected to each other. The connecting strip is disposed between the second sub-adjusting member and the strip body, and one end of the connecting strip away from the latch body is connected to the strip body. In the first state, the third end and the fifth end are movably connected to the same position of the belt body, the fourth end and the sixth end are fixedly connected to the same position of the belt body, and the third end and the fifth end are close to the upper end of the belt body, so that the belt body partially overlaps with the second sub-adjustment and the third sub-adjustment; In the second state, the third end or the third end and the fifth end are disconnected from the belt body, so that at least part of the portion of the belt body overlapping with the second sub-adjustment and the third sub-adjustment is released.

[0013] Optionally, the adjustment mechanism further includes: a first limiting member and a second limiting member; In the first state, the first limiting member is fitted onto the belt body and connected to the third end and the fifth end. In the second state, the first limiting member breaks, thereby disconnecting the third end or the third end and the fifth end from the belt body. The second limiting member is fitted onto the belt body and connected to the connecting strip, the fourth end, and the sixth end. And / or, the second sub-adjustment includes two first edges extending along the length direction of the belt, the third sub-adjustment includes two second edges extending along the length direction of the belt, one of the first edges is connected to one of the second edges, and the breaking strength at the connection between at least one first edge and the corresponding second edge is less than the breaking strength of the second sub-adjustment and the third sub-adjustment.

[0014] Optionally, the adjustment mechanism further includes a third cutter for cutting off the first limiting member.

[0015] Optionally, in the second state, the end of the second adjusting member that is disconnected from the belt body is the target end; The fracture strength at the connection between the target end and the belt body is less than the fracture strength of the second adjusting member and the belt body; In the first state, the target end remains connected to the belt body; in the second state, the connection between the target end and the belt body breaks. Alternatively, the adjustment mechanism may further include a second cutter for cutting off the connection between the target end and the belt.

[0016] Optionally, the adjustment mechanism includes: a third locking element and a fourth locking element; The third locking member is connected to the belt body and located on the side of the second locking member near the upper end of the belt body. The fourth locking member is fixedly connected to the belt body and located on the side of the second locking member near the lower end of the belt body. In the first state, the third locking member and the fourth locking member are in an unlocked state, so that the intersection of the shoulder strap and the waist belt is located in the first position. In the second state, the third locking member and the fourth locking member are in a locked state, so that the intersection of the waist belt is located in the second position.

[0017] Optionally, the end of the second adjusting member that is movably connected to the belt body is defined as the movable end, and the end that is fixedly connected to the belt body is defined as the fixed end; The adjustment mechanism further includes at least one first guide and one second guide sleeved on the belt body, the second guide being close to the lower end of the belt body, the first guide being slidably connected to the belt body, and the second guide being fixedly connected to the belt body; At least one of the movable ends or the third locking member is connected to one of the first guide members, and at least one of the fixed ends or the fourth locking member is connected to the second guide member.

[0018] Optionally, the second guide member is provided with a first limiting part, and the belt body is provided with a plurality of second limiting parts, the second limiting parts being in limiting cooperation with the first limiting parts.

[0019] Optionally, one of the first limiting part and the second limiting part is a limiting hole, and the other is a limiting pin, wherein the limiting pin is inserted into the limiting hole; Alternatively, one of the first limiting part and the second limiting part is a female buckle, and the other is a male buckle, wherein the male buckle is engaged with the female buckle.

[0020] Secondly, embodiments of this application provide a vehicle seat assembly including the aforementioned seat belt device.

[0021] Thirdly, embodiments of this application propose a vehicle including the aforementioned seatbelt device or vehicle seat assembly.

[0022] In this embodiment, an adjustment mechanism is provided between the belt body and the second locking member, or on the belt body. This adjustment mechanism has a first state in which the intersection point of the shoulder belt and the lap belt is located in a first position, and a second state in which the intersection point of the shoulder belt and the lap belt is located in a second position. The distance between the first position and the first locking member is smaller than the distance between the second position and the first locking member. That is, the intersection point position of the shoulder belt and the lap belt of the seat belt device can be changed. Thus, when the adjustment mechanism is in the first state, the intersection point of the shoulder belt and the lap belt can be kept close to the first locking member in the first position (i.e., the side of the occupant), thereby achieving reliable restraint of the occupant under normal vehicle operating conditions. When the adjustment mechanism is switched to the second state, the intersection point of the shoulder belt and the lap belt can be moved to a second position away from the first locking member (i.e., in front of the occupant). This allows the lower half of the shoulder belt to return to the front of the occupant under vehicle collision conditions, reducing or avoiding the lateral movement tendency of the upper half of the shoulder belt, thereby reducing the risk of the seat belt strangulation under vehicle collision conditions and improving the safety of the seat belt device.

[0023] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the structural schematic diagrams of a seat belt device provided in the embodiments of this application; Figure 2 This is a second schematic diagram of a seat belt device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the seat belt device when the upper body of the occupant leans forward during a vehicle collision. Figure 4 yes Figure 3 A magnified view of the area at position O in the middle; Figure 5 This is a diagram showing the condition of the shoulder straps when the upper body of the passenger leans forward in a normal sitting position. Figure 6 This is a diagram showing the shoulder strap position when the occupant's upper body is leaning forward in a reclining position. Figure 7 This is a schematic diagram of the seatbelt device when the occupant is in a lying position; Figure 8 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment 1 of this application; Figure 9 This is a second schematic diagram of the structure of the seat belt device provided in Embodiment 1 of this application; Figure 10 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment 2 of this application; Figure 11 This is a second schematic diagram of the structure of the seat belt device provided in Embodiment 2 of this application; Figure 12 This is a schematic diagram of the seat belt device provided in Embodiment 3 of this application; Figure 13 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment 4 of this application; Figure 14 This is the second structural schematic diagram of the seat belt device provided in Embodiment 4 of this application; Figure 15 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment 5 of this application; Figure 16 This is the second structural schematic diagram of the seat belt device provided in Embodiment 5 of this application; Figure 17 This is the third structural schematic diagram of the seat belt device provided in Embodiment 5 of this application; Figure 18 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment Six of this application; Figure 19 This is the second structural schematic diagram of the seat belt device provided in Embodiment Six of this application; Figure 20 This is the third structural schematic diagram of the seat belt device provided in Embodiment Six of this application; Figure 21This is one of the partial structural schematic diagrams of the seat belt device provided in Embodiment Six of this application; Figure 22 This is a second partial structural schematic diagram of the seat belt device provided in Embodiment Six of this application; Figure 23 This is the third partial structural schematic diagram of the seat belt device provided in Embodiment Six of this application; Figure 24 This is one of the structural schematic diagrams of the seat belt device provided in Embodiment 7 of this application; Figure 25 This is the second structural schematic diagram of the seat belt device provided in Embodiment 7 of this application; Figure 26 This is a schematic diagram of the cooperation between the limiting guide and the belt body provided in the embodiments of this application; Figure 27 This is a control flowchart of the seat belt device provided in the embodiments of this application.

[0025] Figure label: 100. Seat belt device, 1. Belt body, 11. Shoulder strap, 12. Waist belt, 121. Second limiting part, 2. First locking element, 3. Second locking element; 31. Locking tongue body; 32. Connecting strip. 4. Adjustment mechanism, 41. First adjusting member, 411. Adjusting part, 42. Second adjusting member, 421. First sub-adjusting member, 4211. First end, 4212. Second end, 422. Second sub-adjusting member, 4221. Third end, 4222. Fourth end, 423. Third sub-adjusting member, 4231. Fifth end, 4232. Sixth end, 43. First limiting member, 44. Second limiting member, 45. Third locking member, 46. Fourth locking member, 47. First guide member, 48. Second guide member, 481. First limiting part, 482. Limiting upper cover, 483. Limiting lower cover, 49. First cutter, 410. Second retractor, 5. First reel receiver, 6. Preload device, 200. Vehicle seat assembly, 300. Crew. Detailed Implementation

[0026] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] With the advancements in autonomous driving and the redefinition of in-car comfort by automakers, zero-gravity seats are becoming increasingly common in vehicles. In addition to the middle and rear seats and the front passenger seat, when autonomous driving becomes widespread, even the driver's seat will be equipped with a zero-gravity seat to provide relaxation for passengers while driving.

[0031] A three-point seat belt is a common type of seat belt device, which typically includes a belt body, a buckle, and a latch. The belt body is located on one side of the vehicle seat assembly in the width direction and includes a shoulder strap for restraining the occupant's chest and a lap belt for restraining the occupant's waist. The buckle is located on the other side of the vehicle seat assembly in the width direction, and the latch is movably connected to the belt body and detachably connected to the buckle.

[0032] In a normal sitting position, the intersection of the shoulder strap and lap belt is located at the occupant's side, specifically at the side of the buttocks. The shoulder strap hangs straight in front of the occupant, and the force on the shoulder strap is diagonally along the direction of the strap, thus reducing the risk of lateral movement of the shoulder strap causing strangulation. However, in a reclining position, i.e., when the vehicle seat assembly is tilted, specifically when the angle between the vehicle seat assembly and the vertical direction exceeds 24°, the restraining effect of the lap belt on the occupant weakens. The occupant may slide forward in the early stages of a collision, and in this case, the intersection of the shoulder strap and lap belt is no longer... The shoulder strap will change; the lower half will move from in front of the occupant to their side. Testing has shown that the lower half of the shoulder strap can extend from the occupant's hip to their ribcage. At this point, the lap belt's restraint increases, causing the occupant's upper body to lean forward significantly. The shoulder strap changes from a straight position to a mid-bend; that is, the lower half of the shoulder strap tends to be vertical, located at the waist, while the upper half tends to be horizontal, located in front of the chest. In this case, the lateral force of the upper half of the shoulder strap is greater, and the occupant's forward lean will cause the seatbelt to dig into their neck. Specifically, the shoulder strap is divided into an upper and lower half from the center of the chest. The upper half refers to the portion of the shoulder strap from the center of the chest to the shoulder, and the lower half refers to the portion from the center of the chest to the hip.

[0033] In other words, when the vehicle seat assembly is tilted and a collision occurs, the upper part of the shoulder strap often experiences significant lateral movement due to the combined effects of occupant forward sliding and substantial forward tilting, potentially leading to the seatbelt choking the occupant's neck. Recent safety regulations have emphasized the danger of seatbelts choking the neck and incorporated it into assessment criteria.

[0034] This application provides a seat belt device, which will be described in detail below with reference to the accompanying drawings.

[0035] Reference Figures 1 to 2 The diagram shows a structural schematic of a seatbelt device according to an embodiment of this application. (Refer to...) Figures 3 to 4 This shows a schematic diagram of the seatbelt device when the occupant's upper body leans forward during a vehicle collision. (Refer to...) Figures 5 to 6 The diagrams show the shoulder strap positions when the occupant's upper body is leaning forward in both a normal sitting and reclining position. Figure 7 This shows a schematic diagram of the seatbelt device when the occupant is in a reclining position. (Refer to...) Figures 8 to 26 The diagram shows the structural schematics of six types of seat belt devices. Figure 27The diagram shows a control flowchart of the seat belt device provided in an embodiment of this application.

[0036] It should be noted that, Figure 9 , Figure 11 , Figure 12 as well as Figure 14 The approximate positions of the belt body 1 of different seat belt devices 100 under normal vehicle operating conditions are shown by single-dot dashed lines, and the approximate positions of the belt body 1 of different seat belt devices 100 under vehicle collision conditions are shown by solid lines. Figure 16 , Figure 19 , Figure 21 as well as Figure 24 The approximate positions of the belt body 1 of different seat belt devices 100 under normal vehicle operating conditions are shown by single-dot dashed lines. Figure 17 , Figure 20 as well as Figure 25 Solid lines are used to show the approximate positions of the belt body 1 of different seat belt devices 100 under vehicle collision conditions.

[0037] like Figures 1 to 2 As shown, this application provides a seat belt device 100 applied to a vehicle seat assembly 200. The vehicle seat assembly 200 has a first side and a second side disposed opposite to each other along its width direction. The seat belt device 100 includes: a belt body 1, with both ends of the belt body 1 for connection to the first side; a first locking member 2 for connection to the second side; and a second locking member 3 connected to the belt body 1 and detachably connected to the first locking member 2. When the second locking member 3 is connected to the first locking member 2, the belt body 1 includes a shoulder strap 11 for restraining the chest of the occupant 300. The belt 12 for restraining the waist of the occupant 300; and the adjustment mechanism 4, disposed between the belt body 1 and the second locking member 3, or disposed on the belt body 1, the adjustment mechanism 4 having a first state and a second state, in the first state, the intersection of the shoulder strap 11 and the waist belt 12 is located at the first position A, and in the second state, the intersection of the shoulder strap 11 and the waist belt 12 is located at the second position B; the first position A and the second position B are located between the first side and the second side, and the distance between the first position A and the first locking member 2 is less than the distance between the second position B and the first locking member 2.

[0038] In this embodiment, an adjustment mechanism 4 is provided between the belt body 1 and the second locking member 3, or on the belt body 1. This adjustment mechanism 4 has a first state in which the intersection of the shoulder strap 11 and the waist belt 12 is located at a first position A, and a second state in which the intersection of the shoulder strap 11 and the waist belt 12 is located at a second position B. The distance between the first position A and the first locking member 2 is smaller than the distance between the second position B and the first locking member 2. That is to say, the intersection position of the shoulder strap 11 and the waist belt 12 of the seat belt device can be changed. Thus, when the adjustment mechanism 4 is in the first state, the intersection of the shoulder strap 11 and the waist belt 12 can be kept close to the first locking member 2 at the first position A (i.e., the side of the occupant 300), thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, the intersection of the shoulder strap 11 and the lap belt 12 can be moved to a second position B (i.e., in front of the occupant 300) away from the first locking member 2. This allows the lower half of the shoulder strap 11 to return to the occupant 300's position during a vehicle collision, reducing or preventing the lateral movement of the upper half of the shoulder strap 11. Consequently, this reduces the risk of the seat belt strangling the occupant during a vehicle collision, improving the safety of the seat belt device 100. Here, "return" refers to returning to the initial position for reset; the same applies below and will not be elaborated further.

[0039] It should be noted that the adjustment mechanism 4 in this embodiment can switch automatically or manually, and this is not limited thereto. Those skilled in the art can choose according to actual needs. Automatic switching means that without manual intervention, the system (such as the vehicle controller) can directly trigger the adjustment mechanism 4 to switch from the first state to the second state during a vehicle collision. Manual switching means that manual operation is required before a vehicle collision to trigger the adjustment mechanism 4 to switch from the first state to the second state.

[0040] Furthermore, the connection between the second locking member 3 and the belt body 1 can be direct or indirect. Specifically, when the adjusting mechanism 4 is located between the belt body 1 and the second locking member 3, the second locking member 3 is indirectly connected to the belt body 1, meaning that both the second locking member 3 and the belt body 1 are directly connected to the adjusting mechanism 4. When the adjusting mechanism 4 is located on the belt body 1, the second locking member 3 is directly connected to the belt body 1. Additionally, the belt body 1 can be a webbing, the first locking member 2 can be a buckle, and the second locking member 3 can be a locking tongue.

[0041] Specifically, such as Figures 3 to 7 As shown, under normal vehicle operating conditions, the shoulder strap 11 is suspended at position s1 in front of the occupant 300, and the shoulder strap 11 at the shoulder of the occupant 300 is located at position a1.

[0042] For seat belt devices 100 without adjustment mechanism 4, when the occupant 300 is in a seated position, in a vehicle collision, the occupant 300 leans forward, and the lap belt 12 can restrain them in time. The lower half of the shoulder strap 11 hangs in front of the occupant 300, and there is usually no risk of strangulation. When the occupant 300 is in a reclining position, in a vehicle collision, the restraining effect of the lap belt 12 weakens, the occupant 300 leans forward more, and the lower half of the shoulder strap 11 moves to the side of the occupant 300. The contact point between the lower half of the shoulder strap 11 and the occupant 300 is raised to the waist or even the chest, thus posing a risk of strangulation. Therefore, the "vehicle collision condition" mentioned above refers to the situation where the occupant 300 is in a reclining position, that is, when the vehicle seat assembly 200 is in a tilted state and a collision occurs. Among them, "tilted state" means that the angle between the backrest of the vehicle seat assembly 200 and the vertical direction exceeds 24°.

[0043] Depend on Figures 3 to 4 It can be seen that when the vehicle seat assembly 200 is tilted and the vehicle is in a collision condition, the lower half of the shoulder strap 11 moves to position s1.2 on the side of the occupant 300, the upper half of the shoulder strap 11 moves laterally to position s1.1 in front of the occupant 300, and the shoulder strap 11 at the shoulder of the occupant 300 is located at position a2, which increases the degree of intrusion of the seat belt and will eventually be inserted into the neck of the occupant 300 in the form of s5.

[0044] For the seat belt device 100 equipped with the adjustment mechanism 4, the intersection point of the shoulder strap 11 and the lap belt 12 moves from a first position A on the side of the occupant 300 to a second position B in front of the occupant 300. This allows the lower half of the shoulder strap 11 to return to the front of the occupant 300 during a vehicle collision, reducing or preventing the lateral movement of the upper half of the shoulder strap 11. This results in the shoulder strap 11 being suspended at position s3 in front of the occupant 300, with the shoulder strap 11 at the occupant 300's shoulder located at position a3. Compared to positions a1 and a2, position a3 is closer to... Figure 3 The rightward movement of the shoulder strap 11 increases the distance between the shoulder strap 11 and the neck of the occupant 300, thereby effectively reducing the risk of the seat belt strangling the neck in the event of a vehicle collision.

[0045] It should be noted that the seat belt device 100 in this embodiment can be applied to the vehicle seat assembly 200 in a smart cockpit, the vehicle seat assembly 200 in a traditional cockpit, or other application scenarios, and is not limited here. Furthermore, the vehicle seat assembly 200 in this embodiment includes, but is not limited to, the driver's seat, the front passenger seat, and the middle and rear passenger seats. The driver's seat is used as an example for detailed description below, and other vehicle seat assemblies 200 can be referred to and applied accordingly. Further, this embodiment does not limit the specific orientation of the first side and the second side, and those skilled in the art can adjust them according to actual needs. The first side is described in detail as the left side of the driver's seat, and the second side as the right side of the driver's seat; other orientations can be referred to and applied accordingly.

[0046] In practical applications, the seat belt device 100 also includes a first retractor 5 and a pretensioner 6. The first retractor 5 and the pretensioner 6 are disposed on the first side and distributed vertically along the height direction of the vehicle seat assembly 200. The first retractor 5 and the pretensioner 6 are respectively connected to both ends of the belt body 1. Among them, the first retractor 5 can be a retractor with multi-stage pretensioning function, which can not only realize the winding and releasing of the belt body 1, but also instantly tighten the belt body 1 in a collision, increase the restraint effect, and improve the safety of the seat belt device 100. The pretensioner 6 can be a pyrotechnic lap pretensioner (PLP), whose main function is to ignite and detonate it in the event of a collision to tighten the belt body 1, quickly pull the occupant 300's buttocks and legs back to the seat, reduce the forward displacement of the occupant 300 in the collision, thereby reducing the risk of chest and waist injuries, and further improving the safety of the seat belt device 100.

[0047] Understandably, when the intersection of the shoulder strap 11 and the waist belt 12 moves from the first position A on the side of the occupant 300 to the second position B in front of the occupant 300, the belt body 1 will loosen, reducing its fit with the occupant 300. By setting the first retractor 5 and the pretensioner 6, as the intersection of the shoulder strap 11 and the waist belt 12 moves, the first retractor 5 and / or the pretensioner 6 can tighten the belt body 1 in time, allowing the belt body 1 to fit better with the occupant 300, thereby achieving both reducing the risk of strangulation and reliably restraining the occupant 300.

[0048] In practical applications, the first retractor 5 can be installed on the vehicle seat assembly 200 or the vehicle body. Specifically, generally, the first retractor 5 can be installed on the B-pillar of the vehicle body; in a large-angle zero-gravity seat, the first retractor 5 can be installed in the seat back. The pretensioner 6 can be installed on the vehicle seat assembly 200 or the vehicle body. Specifically, the pretensioner 6 can be installed on the vehicle floor or below the vehicle seat assembly 200. It should be noted that, for ease of description, the end of the belt 1 connected to the first retractor 5 is defined as the upper end of the belt 1, and the end of the belt 1 connected to the pretensioner 6 is defined as the lower end of the belt 1.

[0049] In some alternative embodiments of this application, such as Figures 8 to 11 As shown, the adjustment mechanism 4 includes: a first adjustment member 41, which is disposed between the belt body 1 and the second locking member 3 and connected to both the belt body 1 and the second locking member 3. The first adjustment member 41 has a first length and a second length, with the second length being greater than the first length. In a first state, the first adjustment member 41 is held at the first length so that the intersection of the shoulder strap 11 and the waist belt 12 is located at a first position. In a second state, the first adjustment member 41 switches to the second length so that the intersection of the shoulder strap 11 and the waist belt 12 moves to a second position. The first adjustment member 41 can be a flexible component, i.e., a structural component that is easily deformed under external force, including but not limited to webbing.

[0050] Specifically, in the first state, the first adjusting member 41 is located at position s4 and maintains a first length, so that the shoulder strap 11 is located at position s1, and the intersection of the shoulder strap 11 and the waist belt 12 is located at a first position A on the side of the occupant 300; in the second state, the first adjusting member 41 is still located at position s4 but switches to a second length, so that the shoulder strap 11 moves to position s3, and the intersection of the shoulder strap 11 and the waist belt 12 moves to a second position B in front of the occupant 300. It can be understood that in this embodiment, the waist belt 12 and the first adjusting member 41 together serve to restrain the waist of the occupant 300.

[0051] In this embodiment, a first adjusting member 41 is provided between the belt body 1 and the second locking member 3, and the first adjusting member 41 can be switched from a shorter first length to a longer second length. Thus, when the adjusting mechanism 4 is in the first state, the first adjusting member 41 can be maintained at the shorter first length, keeping the intersection of the shoulder belt 11 and the lap belt 12 at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjusting mechanism 4 is switched to the second state, the first adjusting member 41 can be switched to the longer second length, moving the intersection of the shoulder belt 11 and the lap belt 12 to the second position B, moving the intersection of the shoulder belt 11 and the lap belt 12 in front of the occupant 300. This allows the lower half of the shoulder belt 11 to return to the occupant 300 in the event of a vehicle collision, reducing or avoiding the lateral movement tendency of the upper half of the shoulder belt 11, thereby reducing the risk of the seat belt strangulation during a vehicle collision and improving the safety of the seat belt device 100.

[0052] It is understood that in this embodiment, the locking positions of the first locking member 2 and the second locking member 3 are the same in different states. Specifically, in both the first and second states, the locking positions of the first locking member 2 and the second locking member 3 are located at the side of the occupant 300.

[0053] In some alternative embodiments of this application, such as Figure 8 and Figure 9 As shown, the first adjusting member 41 includes at least two stacked adjusting portions 411, with adjacent adjusting portions 411 connected. The breaking strength at the connection between adjacent adjusting portions 411 is less than the breaking strength of the adjusting portion 411. In a first state, the adjacent adjusting portions 411 remain connected; in a second state, the connection between the adjacent adjusting portions 411 breaks, thereby allowing the first adjusting member 41 to switch from a first length to a second length. It is understood that the critical breaking force at the connection between adjacent adjusting portions 411 should be less than the preload of the first retractor 5, meaning that under vehicle collision conditions, the connection between adjacent adjusting portions 411 can automatically and smoothly break under the preload of the first retractor 5.

[0054] In this embodiment, because multiple adjustment parts 411 are provided, and the fracture strength at the connection between two adjacent adjustment parts 411 is less than the fracture strength of the adjustment part 411 itself, the connection between two adjacent adjustment parts 411 is a structurally weak point that can automatically break under external force. Thus, in the first state, the two adjacent adjustment parts 411 remain connected, keeping the first adjustment member 41 at a shorter first length, so that the intersection of the shoulder strap 11 and the lap belt 12 remains at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, the connection between the two adjacent adjustment parts 411 automatically breaks under external force, allowing at least a partial release of the overlapping portion of the first adjustment member 41, thereby switching to a longer second length, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position B, thereby reducing the risk of seatbelt strangulation during a vehicle collision.

[0055] In some alternative embodiments of this application, the first adjusting member 41 further includes a first cutter 49 disposed on the second locking member 3. The first cutter 49 is used to cut off the connection of at least two adjusting parts 411, so that the first adjusting member 41 switches from a first length to a second length. It is understood that at least a portion of the first cutter 49 (specifically, the cutting structure of the first cutter 49) should correspond to the connection of each adjusting part 411 in order to smoothly cut off the connection of at least two adjusting parts 411.

[0056] In this embodiment, due to the presence of multiple adjustment parts 411 and a first cutter 49, the first cutter 49 can sever the connection between at least two adjustment parts 411. That is, the connection between two adjacent adjustment parts 411 does not break automatically under external force, but rather breaks passively under the cutting action of the first cutter 49. Thus, in the first state, adjacent adjustment parts 411 remain connected, keeping the first adjustment member 41 at a shorter first length, so that the intersection of the shoulder strap 11 and the lap belt 12 remains at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, the first cutter 49 can sever the connection between at least two adjustment parts 411, allowing at least a partial release of the overlapping portion of the first adjustment member 41, thereby switching to a longer second length, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position B, thereby reducing the risk of seatbelt strangulation during a vehicle collision.

[0057] It should be noted that the present application does not limit the connection method of two adjacent adjustment parts 411, and those skilled in the art can choose according to actual needs. In one embodiment, two adjacent adjustment parts 411 can be connected by stitching.

[0058] In some alternative embodiments of this application, such as Figure 10 and Figure 11 As shown, the adjustment mechanism 4 further includes a second retractor 410, which is used to retract or release the first adjustment member 41 to switch the first adjustment member 41 between a first length and a second length.

[0059] Specifically, the second retractor 410 can be either a single-sided or double-sided retractor. For the single-sided retractor type, the second retractor 410 can be located at the connection point between the first adjusting member 41 and the belt body 1 and connected to either the first adjusting member 41 or the belt body 1, or it can be located at the connection point between the first adjusting member 41 and the second locking member 3 and connected to either the first adjusting member 41 or the second locking member 3. In this case, one end of the first adjusting member 41 is connected to the second retractor 410, and the other end is connected to either the belt body 1 or the second locking member 3. For the double-sided retractor type, the second retractor 410 can be located between the belt body 1 and the second locking member 3 and connected to the first adjusting member 41. In this case, both ends of the first adjusting member 41 are connected to the belt body 1 and the second locking member 3, respectively.

[0060] In this embodiment, a second retractor 410 is provided on the second locking member 3. The second retractor 410 is connected to the end of the first adjusting member 41 opposite to the belt body 1, thereby enabling the first adjusting member 41 to be wound up or released. Specifically, in the first state, the second retractor 410 can keep the first adjusting member 41 in the wound state, keeping it at a shorter first length so that the intersection of the shoulder strap 11 and the waist belt 12 is held at the first position A. In the second state, the second retractor 410 can release the first adjusting member 41, causing it to switch to a longer second length, so that the intersection of the shoulder strap 11 and the waist belt 12 moves to the second position B.

[0061] It should be noted that the second retractor 410 can be a retractor with a pre-tensioning function, which allows the first adjusting member 41 to be better maintained at the first length. Furthermore, the pre-tensioning force of the second retractor 410 should be less than the pre-tensioning force of the first retractor 5. That is to say, under the pre-tensioning action of the first retractor 5, the second retractor 410 can smoothly release the first adjusting member 41, so that the first adjusting member 41 can smoothly switch to the longer second length.

[0062] In some alternative embodiments of this application, such as Figures 8 to 11 As shown, the end of the first adjusting member 41 facing away from the second locking member 3 is movably connected to the belt body 1. Specifically, the adjusting mechanism 4 further includes: a first guide member 47, which is sleeved on the belt body 1 and slidably connected to the belt body 1; the end of the first adjusting member 41 facing away from the second locking member 3 is connected to the first guide member 47. The first guide member 47 can be a rigid member with a perforated structure.

[0063] In this embodiment, a first guide member 47 is provided, which is sleeved on the belt body 1 and slidably connected to it. Thus, by connecting the end of the first adjusting member 41 facing away from the second locking member 3 to the first guide member 47, the first adjusting member 41 can slide relative to the belt body 1. This not only allows the intersection point of the shoulder strap 11 and the waist belt 12 to smoothly switch from the first position A to the second position B, but also allows for adaptive adjustment of the lengths of the shoulder strap 11 and the waist belt 12. This improves the adaptive adjustment capability of the seat belt device 100, better adapts to users of different body types, and enhances the user experience.

[0064] In some alternative embodiments of this application, such as Figure 12 As shown, the first adjusting member 41 can also be disposed at the end of the first locking member 2 opposite to the second locking member 3, and both ends of the first adjusting member 41 are respectively connected to the first locking member 2, the vehicle seat assembly 200, or the vehicle body. The first adjusting member 41 can be hidden inside the vehicle seat assembly 200.

[0065] Specifically, in the first state, the first adjusting member 41 is located at position s4 and maintains a first length, so that the shoulder strap 11 is located at position s1, and the intersection of the shoulder strap 11 and the waist belt 12 is located at a first position A on the side of the occupant 300; in the second state, the first adjusting member 41 is still located at position s4 but switches to a second length, so that the shoulder strap 11 moves to position s3, and the intersection of the shoulder strap 11 and the waist belt 12 moves to a second position B in front of the occupant 300. It can be understood that in this embodiment, the waist belt 12 and the first adjusting member 41 together serve to restrain the waist of the occupant 300.

[0066] In this embodiment, when the first adjusting member 41 is held at a shorter first length, the intersection of the shoulder strap 11 and the lap belt 12 can be held at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the first adjusting member 41 is switched to a longer second length, the first locking member 2 and the second locking member 3, as well as the intersection of the shoulder strap 11 and the lap belt 12, can all move to the second position B, causing the intersection of the shoulder strap 11 and the lap belt 12 to move in front of the occupant 300. This allows the lower half of the shoulder strap 11 to return to the front of the occupant 300 under vehicle collision conditions, reducing or avoiding the lateral movement tendency of the upper half of the shoulder strap 11, thereby reducing the risk of the seat belt strangulation under vehicle collision conditions and improving the safety of the seat belt device 100.

[0067] It is understood that in this embodiment, the locking positions of the first locking member 2 and the second locking member 3 are different in different states. Specifically, in the first state, the locking positions of the first locking member 2 and the second locking member 3 are located at the side of the occupant 300, and in the second state, the locking positions of the first locking member 2 and the second locking member 3 are located in front of the occupant 300. Furthermore, the length adjustment method of the first adjusting member 41 is the same as above, and will not be described again here.

[0068] In some alternative embodiments of this application, such as Figures 13 to 23 As shown, the adjustment mechanism 4 includes: at least one second adjusting member 42, and a second locking member 3 connected to one of the second adjusting members 42; in a first state, both ends of the second adjusting member 42 are connected to the belt body 1, the belt body 1 partially overlaps or the belt body 1 partially overlaps with the second adjusting member 42, so that the intersection of the shoulder strap 11 and the waist belt 12 is located in a first position; in a second state, one end of at least one second adjusting member 42 is disconnected from the belt body 1, and at least partially, the overlapping portion of the belt body 1 or the overlapping portion of the belt body 1 and the second adjusting member 42 is released, so that the intersection of the shoulder strap 11 and the waist belt 12 moves to a second position. The second adjusting member 42 can be a flexible member, i.e., a structural member that is easily deformed under external force, including but not limited to webbing; or it can be a rigid member, i.e., a structural member that is not easily deformed under external force, including but not limited to rigid plastic members, such as rigid polyvinyl chloride.

[0069] In this embodiment, at least one second adjusting member 42 is provided. In the first state, both ends of the second adjusting member 42 are connected to the belt body 1, and in the second state, one end of the at least one second adjusting member 42 is disconnected from the belt body 1. Thus, by connecting the second locking member 3 to one of the second adjusting members 42, when the adjusting mechanism 4 is held in the first state, both ends of the second adjusting member 42 are connected to the belt body 1, causing the belt body 1 to partially overlap or the belt body 1 and the second adjusting member 42 to partially overlap, so that the intersection of the shoulder strap 11 and the waist belt 12 is held in the first position, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, at least one end of the second adjustment member 42 is disconnected from the belt body 1, so that the overlapping part of the belt body 1 or the overlapping part of the belt body 1 and the second adjustment member 42 is at least partially released, so that the intersection of the shoulder strap 11 and the waist belt 12 moves to the second position, thereby driving the lower half of the shoulder strap 11 back to the front of the occupant 300 in the event of a vehicle collision, reducing or avoiding the lateral movement tendency of the upper half of the shoulder strap 11, reducing the risk of the seat belt strangulation in the event of a vehicle collision, and improving the safety of the seat belt device 100.

[0070] In the second state, the end of the second adjusting member 42 that is disconnected from the belt body 1 is the target end. In some embodiments, the fracture strength at the connection between the target end and the belt body 1 is less than the fracture strength of the second adjusting member 42 and the belt body 1. In the first state, the target end remains connected to the belt body 1; in the second state, the connection between the target end and the belt body 1 breaks. That is to say, the connection between the target end and the belt body 1 is a structurally weak point that can automatically break under external force. It can be understood that the critical fracture force at the connection between the target end and the belt body 1 should be less than the preload of the first retractor 5, meaning that under vehicle collision conditions, the connection between the target end and the belt body 1 can easily and automatically break under the preload of the first retractor 5.

[0071] In the first state, the target end remains connected to the belt body 1, such that the belt body 1 partially overlaps or the belt body 1 partially overlaps with the second adjusting member 42, so that the intersection of the shoulder belt 11 and the lap belt 12 is held in the first position, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, the connection between the target end and the belt body 1 automatically breaks under the action of external force, so that the overlapping portion of the belt body 1 or the overlapping portion of the belt body 1 and the second adjusting member 42 is at least partially released, so that the intersection of the shoulder belt 11 and the lap belt 12 moves to the second position, thereby reducing the risk of seat belt strangulation under vehicle collision conditions.

[0072] In other embodiments, the adjusting mechanism 4 further includes a second cutter for cutting off the connection between the target end and the belt 1. That is, the connection between the target end and the belt 1 does not break automatically under external force, but is passively broken by the cutting action of the second cutter.

[0073] In the first state, the target end remains connected to the belt body 1, such that the belt body 1 partially overlaps or the belt body 1 partially overlaps with the second adjusting member 42, so that the intersection of the shoulder strap 11 and the lap belt 12 is held in the first position, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, the second cutter can cut off the connection between the target end and the belt body 1, so that the overlapping portion of the belt body 1 or the overlapping portion of the belt body 1 and the second adjusting member 42 is at least partially released, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position, thereby reducing the risk of seat belt strangulation under vehicle collision conditions.

[0074] In some alternative embodiments of this application, such as Figures 13 to 14As shown, the second adjusting member 42 includes a first sub-adjusting member 421. The first sub-adjusting member 421 includes a first end 4211 (i.e., the end of the first sub-adjusting member closer to point A) and a second end 4212 (i.e., the end of the first sub-adjusting member closer to point B) that are opposite to each other. The second end 4212 is fixedly connected to the belt body 1. In a first state, the first end 4211 is connected to the belt body 1 and is close to the upper end of the belt body 1, so that the belt body 1 and the first sub-adjusting member 421 partially overlap. In a second state, the first end 4211 is disconnected from the belt body 1, so that the overlapping part of the belt body 1 and the first sub-adjusting member 421 is released. The first end 4211 is the target end mentioned above. The first end 4211 can be fixedly connected to the belt body 1 or movably connected to the belt body 1; this is not limited here. Understandably, when the first end 4211 is movably connected to the belt body 1, the lengths of the adjustable shoulder strap 11 and waist belt 12 can be adaptively adjusted to better suit users of different body types, thereby improving the user experience.

[0075] Specifically, in the first state, the first sub-adjustment 421 is located at position s4 and partially overlaps with the waist belt 12 located at position s2.1, so that the shoulder strap 11 is located at position s1, and the intersection of the shoulder strap 11 and the waist belt 12 is located at a first position A on the side of the occupant 300; in the second state, the first end 4211 of the first sub-adjustment 421 is disconnected from the belt body 1, so that the waist belt 12 located at position s2.1 is released, the shoulder strap 11 moves to position s3, and the intersection of the shoulder strap 11 and the waist belt 12 moves to a second position B in front of the occupant 300. It can be understood that in this embodiment, the waist belt 12 and the first sub-adjustment 421 together serve to restrain the waist of the occupant 300.

[0076] When the adjustment mechanism 4 is in the first state, the first end 4211 is connected to the belt body 1 so that the belt body 1 partially overlaps with the first sub-adjustment 421, thereby keeping the intersection of the shoulder strap 11 and the lap belt 12 at the first position A, thus achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, the first end 4211 is disconnected from the belt body 1, so that the overlapping portion of the belt body 1 and the first sub-adjustment 421 is released, thereby moving the intersection of the shoulder strap 11 and the lap belt 12 to the second position B, thereby reducing the risk of seat belt strangulation during vehicle collisions. It is understood that in this embodiment, the first sub-adjustment 421 and the lap belt 12 together serve to restrain the waist of the occupant 300.

[0077] In some alternative embodiments of this application, such as Figures 15 to 23As shown, the second adjusting member 42 includes a second sub-adjusting member 422 and a third sub-adjusting member 423. The second sub-adjusting member 422 includes a third end 4221 and a fourth end 4222 that are opposite to each other, and the third sub-adjusting member 423 includes a fifth end 4231 and a sixth end 4232 that are opposite to each other. The second locking member 3 is connected to the second sub-adjusting member 422. In a first state, the third end 4221, the fourth end 4222, the fifth end 4231, and the sixth end 4232 are connected to the belt body 1, and the third end 4221 and the fifth end 4231 are close to the upper end of the belt body 1, so that the belt body 1 partially overlaps or the belt body 1 partially overlaps with the second sub-adjusting member 422 and the third sub-adjusting member 423. In a second state, the third end 4221 and / or the fifth end 4231 are disconnected from the belt body 1, so that at least part of the overlapping portion of the belt body 1 or the overlapping portion of the belt body 1 with the second sub-adjusting member 422 and the third sub-adjusting member 423 is released. Among them, the third end 4221 and / or the fifth end 4231 are the target ends mentioned above.

[0078] When the adjustment mechanism 4 is in the first state, the two ends of the second sub-adjustment 422 (i.e., the third end 4221 and the fourth end 4222) and the two ends of the third sub-adjustment 423 (i.e., the fifth end 4231 and the sixth end 4232) are connected to the belt body 1, so that the belt body 1 partially overlaps or the belt body 1 partially overlaps with the second sub-adjustment 422 and the third sub-adjustment 423, so that the intersection of the shoulder belt 11 and the waist belt 12 is kept in the first position, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, the third end 4221 of the second sub-adjustment 422 near the upper end of the belt body 1 and / or the fifth end 4231 of the third sub-adjustment 423 near the upper end of the belt body 1 are disconnected from the belt body 1, so that at least part of the overlapping part of the belt body 1 or the overlapping part of the belt body 1 with the second sub-adjustment 422 and the third sub-adjustment 423 is released, so that the intersection of the shoulder belt 11 and the waist belt 12 moves to the second position, thereby reducing the risk of the seat belt strangulation under vehicle collision conditions.

[0079] In some alternative embodiments of this application, such as Figures 15 to 17As shown, the second adjusting member 42 includes a second sub-adjusting member 422 and a third sub-adjusting member 423. The second sub-adjusting member 422 includes a third end 4221 (i.e., the end of the second sub-adjusting member 422 near point A1) and a fourth end 4222 (i.e., the end of the second sub-adjusting member 422 near point A2) that are opposite to each other. The third sub-adjusting member 423 includes a fifth end 4231 (i.e., the end of the third sub-adjusting member 423 near point B1) and a sixth end 4232 (i.e., the end of the third sub-adjusting member 423 near point B2) that are opposite to each other. The fifth end 4231 is located at the third end 4222. Between end 221 and the fourth end 4222, end 4222 is located between end 5231 and end 6232; the second locking member 3 is connected to the second sub-adjusting member 422. In the first state, end 4221, end 4222, and end 4231 are movably connected to belt body 1, and end 4232 is fixedly connected to belt body 1, with end 4221 and end 4231 close to the upper end of belt body 1 so that belt body 1 partially overlaps; in the second state, end 4221 is disconnected from belt body 1 so that the overlapping portion of belt body 1 is at least partially released. That is, in this embodiment, end 4221, end 4222, end 4231, and end 4232 are connected to different positions of belt body 1.

[0080] Specifically, in the first state, the second sub-adjustment 422 and the third sub-adjustment 423 are connected to different positions of the belt body 1 so that the waist belt 12 overlaps at positions s2.1, s2.3 and s2.4, and restricts the shoulder strap 11 to position s1. The intersection of the shoulder strap 11 and the waist belt 12 is located at the first position A1 on the side of the occupant 300. In the second state, the third end 4221 of the first sub-adjustment 421 is disconnected from the belt body 1 so that the belt body 1 at position s2.4 is released, the shoulder strap 11 moves to position s3, and the intersection of the shoulder strap 11 and the waist belt 12 moves to the second position B1 in front of the occupant 300.

[0081] In the first state, since the third end 4221, the fourth end 4222, and the fifth end 4231 are movably connected to the belt body 1, and the sixth end 4232 is fixedly connected to the belt body 1, the belt body 1 partially overlaps, so that the intersection of the shoulder strap 11 and the lap belt 12 is held at the first position A1, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, since the third end 4221 of the second sub-adjustment member 422 near the upper end of the belt body 1 is disconnected from the belt body 1, the overlapping portion of the belt body 1 is at least partially released, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position B1, thereby reducing the risk of seat belt strangulation under vehicle collision conditions.

[0082] Furthermore, the length of the third sub-adjustment 423 can be fixed or adjustable. Understandably, when the length of the third sub-adjustment 423 is adjustable, the vertical position of the intersection point of the shoulder strap 11 and the lap belt 12 can be changed, thereby better dispersing the force and reducing the force on the occupant's waist during a vehicle collision, thus reducing the injury to the occupant 300 caused by the collision and further improving the safety of the seat belt device 100. The third sub-adjustment 423 can be a single webbing or composed of two webbings. If it is a single webbing, the length can be adjusted by pulling the strap; if it is two webbings, the length can be adjusted by snaps, buckles, or other similar methods.

[0083] In some alternative embodiments of this application, such as Figures 18 to 20 As shown, the second adjusting member 42 includes a second sub-adjusting member 422 and a third sub-adjusting member 423 disposed on opposite sides of the belt body 1. The second sub-adjusting member 422 includes a third end 4221 (i.e., the end of the second sub-adjusting member 422 near point A) and a fourth end 4222 (i.e., the end of the second sub-adjusting member 422 near point B) that are opposite to each other. The third sub-adjusting member 423 includes a fifth end 4231 (i.e., the end of the third sub-adjusting member 423 near point A) and a sixth end 4232 (i.e., the end of the third sub-adjusting member 423 near point B) that are opposite to each other. The second locking member 3 includes a locking tongue body 31 and a connecting band 32 that are connected to each other. The connecting band 32 is disposed on the second sub-adjusting member 422. The connecting strap 32 is connected to the belt body 1 at one end, away from the latch body 31. In a first state, the third end 4221 and the fifth end 4231 are movably connected to the same position on the belt body 1, and the fourth end 4222 and the sixth end 4232 are fixedly connected to the same position on the belt body 1. The third end 4221 and the fifth end 4231 are close to the upper end of the belt body 1, so that the belt body 1 partially overlaps with the second sub-adjustment 422 and the third sub-adjustment 423. In a second state, the third end 4221 or the third end 4221 and the fifth end 4231 are disconnected from the belt body 1, so that at least part of the overlapping portion of the belt body 1 with the second sub-adjustment 422 and the third sub-adjustment 423 is released. That is, in this embodiment, the third end 4221 and the fifth end 4231 are connected to the same position on the belt body 1, and the fourth end 4222 and the sixth end 4232 are connected to the same position on the belt body 1.

[0084] Specifically, taking the disconnection of the third end 4221 and the fifth end 4231 from the belt body 1 as an example, in the first state, the second sub-adjustment member 422 and the third sub-adjustment member 423 are located at position s4 and partially overlap with the waist belt 12 located at position s2.1, so that the shoulder strap 11 is located at position s1, and the intersection of the shoulder strap 11 and the waist belt 12 is located at the first position A on the side of the occupant 300; in the second state, the third end 4221 of the second sub-adjustment member 422 and the fifth end 4231 of the third sub-adjustment member 423 are disconnected from the belt body 1, so that the waist belt 12 located at position s2.1 is released, the shoulder strap 11 moves to position s3, and the intersection of the shoulder strap 11 and the waist belt 12 moves to the second position B in front of the occupant 300.

[0085] In the first state, since the third end 4221 and the fifth end 4231 are movably connected to the belt body 1, and the fourth end 4222 and the sixth end 4232 are fixedly connected to the belt body 1, the belt body 1 partially overlaps with the second sub-adjustment 422 and the third sub-adjustment 423, so that the intersection of the shoulder strap 11 and the lap belt 12 is maintained at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, since the second sub-adjustment 422 near the third end 4221 at the upper end of the belt body 1, or the second sub-adjustment 422 near the third end 4221 at the upper end of the belt body 1 and the third sub-adjustment 423 near the fifth end 4231 at the upper end of the belt body 1 are disconnected from the belt body 1, at least part of the overlapping portion of the belt body 1 with the second sub-adjustment 422 and the third sub-adjustment 423 is released, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position B, thereby reducing the risk of the seat belt strangulation under vehicle collision conditions.

[0086] It is understandable that, compared to the fact that both the third end 4221 and the fifth end 4231 are disconnected from the belt body 1, when only the third end 4221 is disconnected from the belt body 1, the fifth end 4231 remains connected to the belt body 1, thus sharing the tensile force with the connecting belt 32, thereby enhancing the connection strength between the locking tongue body 31 and the belt body 1.

[0087] In some alternative embodiments of this application, such as Figures 21 to 23 As shown, the adjustment mechanism 4 further includes: a first limiting member 43 and a second limiting member 44; in a first state, the first limiting member 43 is sleeved on the belt body 1 and connected to the third end 4221 and the fifth end 4231; in a second state, the first limiting member 43 breaks, so that the third end 4221 or the third end 4221 and the fifth end 4231 are disconnected from the belt body 1; the second limiting member 44 is sleeved on the belt body 1 and connected to the connecting belt 32, the fourth end 4222 and the sixth end 4232.

[0088] In this embodiment, due to the provision of a first limiting member 43 and a second limiting member 44, by connecting the first limiting member 43 to the third end 4221 of the second sub-adjustment member 422 and the fifth end 4231 of the third sub-adjustment member 423, and by connecting the second limiting member 44 to the fourth end 4222 of the second sub-adjustment member 422 and the sixth end 4232 of the third sub-adjustment member 423, the belt body 1 can partially overlap with the second sub-adjustment member 422 and the third sub-adjustment member 423, so that the intersection of the shoulder strap 11 and the lap belt 12 is maintained at the first position A, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. By disconnecting the first limiting member 43 from the third end 4221, or from the third end 4221 to the fifth end 4231, at least part of the overlapping portion of the belt body 1 with the second sub-adjustment member 422 and the third sub-adjustment member 423 can be released, so that the intersection of the shoulder strap 11 and the lap belt 12 moves to the second position B, thereby reducing the risk of seat belt strangulation under vehicle collision conditions.

[0089] It should be noted that the first limiting member 43 can be a rigid member with a perforated structure, through which the belt body 1 can pass, allowing the first limiting member 43 to slide freely relative to the belt body 1. This allows for adjustment of the lengths of the shoulder strap 11 and the waist belt 12, improving the self-adaptive capability of the seat belt device 100. The second limiting member 44 can adopt the same structure as the second guide member 48 described below. It is understood that in this embodiment, there is no need to additionally provide the first guide member 47 and the second guide member 48. Furthermore, the first limiting member 43 can be integrally formed with the locking tongue body 31 to reduce the number of parts and simplify assembly.

[0090] Furthermore, the adjustment mechanism 4 also includes a third cutter for cutting off the first limiting member 43. In this embodiment, due to the provision of the third cutter, the third cutter can cut off the first limiting member 43, causing the third end 4221 or the third end 4221 and the fifth end 4231 to disconnect from the belt body 1. This allows at least a partial release of the overlapping portion of the belt body 1 with the second sub-adjustment member 422 and the third sub-adjustment member 423, so that the intersection of the shoulder strap 11 and the waist belt 12 can move from the first position A to the second position B, thereby reducing the risk of seat belt strangulation in vehicle collision conditions.

[0091] In practical applications, other structures besides the cutter can also be used to release the constraint of the first limiting member 43 on the belt body 1 and the second sub-adjusting member 422 and / or the third sub-adjusting member 423. This is not limited here, and those skilled in the art can make adjustments according to actual needs.

[0092] In some optional embodiments of this application, the second sub-adjustment 422 includes two first edges extending along the length direction of the belt 1, and the third sub-adjustment 423 includes two second edges extending along the length direction of the belt 1. One first edge is connected to one second edge, and the breaking strength at the connection between at least one first edge and the corresponding second edge is less than the breaking strength of the second sub-adjustment 422 and the third sub-adjustment 423. Further, a tear line can be provided at the connection between the first edge and the second edge so that the second sub-adjustment 422 and the third sub-adjustment 423 automatically tear along the tear line under external force.

[0093] In this embodiment, since the first edge and the second edge are connected, a sleeve structure can be formed that fits over the belt body 1 and the connecting strap 32, thereby concealing the connecting strap 32 and improving the overall aesthetics of the seat belt device 100. Because the breaking strength at the connection between at least one first edge and the corresponding second edge is less than the breaking strength of the second sub-adjustment 422 and the third sub-adjustment 423, the connection between the first edge and the second edge is a structurally weak point and can automatically break under external force. This allows at least part of the overlapping portion of the belt body 1 with the second sub-adjustment 422 and the third sub-adjustment 423 to be smoothly released, enabling the intersection of the shoulder strap 11 and the waist belt 12 to move smoothly to the second position B.

[0094] In some alternative embodiments of this application, such as Figures 24 to 25 As shown, the adjustment mechanism 4 includes a third locking member 45 and a fourth locking member 46. The third locking member 45 is connected to the belt body 1 and located on the side of the second locking member 3 near the upper end of the belt body 1. The fourth locking member 46 is fixedly connected to the belt body 1 and located on the side of the second locking member 3 near the lower end of the belt body 1. In the first state, the third locking member 45 and the fourth locking member 46 are in the unlocked state so that the intersection of the shoulder strap 11 and the waist belt 12 is located at the first position A. In the second state, the third locking member 45 and the fourth locking member 46 are in the locked state so that the intersection of the waist belt 12 is located at the second position B.

[0095] It is understood that the adjustment mechanism 4 in this embodiment requires the occupant 300 to manually switch to the second state before a collision. It should be noted that one of the third locking member 45 and the fourth locking member 46 is a latch, and the other is a locking tongue. Furthermore, the third locking member 45 can be fixedly connected to the belt body 1 or movably connected to the belt body 1; this is not limited here. It is understood that when the third locking member 45 is movably connected to the belt body 1, under normal vehicle operating conditions, the third locking member 45 can be slidably stored near the head of the occupant 300 close to the first retractor 5 to prevent the third locking member 45 from affecting the comfort of the seatbelt.

[0096] In the first state, by keeping the third locking member 45 and the fourth locking member 46 in the unlocked state, the intersection of the shoulder strap 11 and the lap belt 12 is held at the first position A, thereby ensuring reliable restraint of the occupant 300 under normal vehicle operating conditions. In the second state, by switching the third locking member 45 and the fourth locking member 46 to the locked state, the intersection of the shoulder strap 11 and the lap belt 12 is moved to the second position B, thereby reducing the risk of seat belt strangulation during a vehicle collision.

[0097] In some alternative embodiments of this application, the seatbelt device 100 further includes a controller electrically connected to one of the second retractor 410, the first cutter 49, the second cutter, or the third cutter. The controller is used to control the operation of the second retractor 410, the first cutter 49, the second cutter, or the third cutter in a second state. For ease of description, the second retractor 410, the first cutter 49, the second cutter, and the third cutter are collectively referred to as triggers.

[0098] In this embodiment, since a controller is provided and the controller is electrically connected to the trigger, the adjustment mechanism 4 can be automatically switched from the first state to the second state, thereby improving the response speed and enabling the intersection position of the shoulder strap 11 and the waist belt 12 to change quickly, which is beneficial to further improving the safety of the seat belt device 100.

[0099] Furthermore, the controller is also electrically connected to the first take-up unit 5 to control its operation. For example... Figure 27 As shown, in a specific application, the controller can determine the state of the vehicle seat assembly 200 during vehicle operation. If the vehicle seat assembly 200 is in a normal sitting position, the trigger is not triggered; if the vehicle seat assembly 200 is in a reclining position, i.e., a tilted state, the trigger is triggered to move the intersection of the shoulder strap 11 and the waist belt 12 from the first position to the second position. At the same time, the controller controls the first retractor 5 to increase the winding amount so that the belt body 1 fits the occupant 300's body as closely as possible, thereby reducing the risk of strangulation while strengthening the restraint on the occupant 300. It should be noted that the structure and working principle of the first retractor 5, the second retractor 410, the first cutter 49, the second cutter, and the third cutter according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0100] In some optional embodiments of this application, the end of the second adjusting member 42 that is movably connected to the belt body 1 is defined as the movable end, and the end that is fixedly connected to the belt body 1 is defined as the fixed end; the adjusting mechanism 4 further includes at least one first guide member 47 and a second guide member 48 sleeved on the belt body 1, the second guide member 48 being close to the lower end of the belt body 1, the first guide member 47 being slidably connected to the belt body 1, and the second guide member 48 being fixedly connected to the belt body 1; at least one movable end or a third locking member 45 is connected to a first guide member 47, and at least one fixed end or a fourth locking member 46 is connected to the second guide member 48.

[0101] Understandably, with Figures 13 to 14 Taking the seat belt device as an example, with the first end 4211 of the first sub-adjustment 421 movably connected to the belt body 1 and the second end 4212 fixedly connected to the belt body 1, the first end 4211 is the aforementioned movable end, and the second end 4212 is the aforementioned fixed end. By setting the fixed end, the intersection of the shoulder belt 11 and the lap belt 12 can always remain in the second position in the event of a vehicle collision, so as to better reduce the risk of strangulation. By setting the movable end, the lengths of the shoulder belt 11 and the lap belt 12 can be adaptively adjusted, which can not only better accommodate users of different body types, but also, with the fixed end position adjustable, make the lengths of s2.1 and s4 approximately the same, effectively avoiding the problem of wrinkles appearing in the belt body 1 and / or the first sub-adjustment 421.

[0102] In this embodiment, a first guide member 47 is provided and slidably connected to the belt body 1. By connecting at least one movable end or the third locking member 45 to the first guide member 47, at least one movable end or the third locking member 45 can slide relative to the belt body 1, thereby adjusting the length of the shoulder strap 11 and the lap belt 12. This improves the adaptive adjustment capability of the seat belt device 100, better adapting to users of different body types and enhancing the user experience. Furthermore, when the third locking member 45 can slide relative to the belt body 1, under normal vehicle operating conditions, the third locking member 45 can be slidably stored near the head of the occupant 300 close to the first retractor 5, preventing it from affecting the comfort of the seat belt. Before a vehicle collision, the occupant 300 can promptly pull out the third locking member 45 and connect it to the fourth locking member 46, reducing the risk of the seat belt strangulating the neck during a collision.

[0103] Because a second guide 48 is provided and fixedly connected to the belt body 1, by connecting at least one fixed end or a fourth locking member 46 to the second guide 48, the intersection of the shoulder strap 11 and the waist belt 12 can always remain in the second position in the event of a vehicle collision, so as to better reduce the risk of strangulation.

[0104] In some alternative embodiments of this application, such as Figure 26 As shown, the second guide member 48 is provided with a first limiting part 481, and the belt body 1 is provided with a plurality of second limiting parts 121, the second limiting parts 121 being connected to the first limiting part 481.

[0105] Generally, the specific position of the intersection of the moved shoulder strap 11 and waist belt 12 depends on the position of the second guide member 48 on the belt body 1. Based on this, in this embodiment, since the second guide member 48 is provided with a first limiting part 481 and the belt body 1 is provided with a second limiting part 121, by connecting the second limiting part 121 to the first limiting part 481, the position of the second guide member 48 on the belt body 1 can be relatively fixed, thereby ensuring that the intersection of the moved shoulder strap 11 and waist belt 12 is at the desired position, thus better reducing the risk of strangulation. Since multiple second limiting parts 121 are provided, by connecting the first limiting part 481 to different second limiting parts 121, the position of the second guide member 48 on the belt body 1 can be changed, thereby adjusting the position of the intersection of the shoulder strap 11 and waist belt 12, which is beneficial to further improve the adaptive adjustment capability of the seat belt device 100.

[0106] Optionally, the first guide member 47 can be a rigid member with a perforated structure. The second guide member 48 may include a limiting upper cover 482 and a limiting lower cover 483, which are disposed on opposite sides of the belt body 1 and are detachably connected. The first limiting part 481 is disposed on the side of the limiting upper cover 482 near the belt body 1 or the side of the limiting lower cover 483 near the belt body 1. Thus, when the limiting lower cover 483 and the limiting upper cover 482 are connected, the first limiting part 481 and the second limiting part 121 engage in a limiting cooperation to keep the intersection point of the moved shoulder strap 11 and waist belt 12 in a preset position. When the limiting lower cover 483 and the limiting lower cover 483 are removed and the connection is released, the first limiting part 481 and the second limiting part 121 can be released from the limiting cooperation, thereby allowing adjustment of the intersection point of the moved shoulder strap 11 and waist belt 12. It is understandable that the second limiting member 44 mentioned above can adopt the same structure as the second guide member 48.

[0107] It should be noted that the specific structure of the first limiting part 481 and the second limiting part 121 is not limited in the embodiments of this application, and those skilled in the art can make adjustments according to actual needs. In some embodiments, one of the first limiting part 481 and the second limiting part 121 is a limiting hole, and the other is a limiting pin, which is inserted into the limiting hole. In this way, by inserting the limiting pin into the limiting hole, the limiting guide can be held in a specific position of the belt body 1. In other embodiments, one of the first limiting part 481 and the second limiting part 121 is a female buckle, and the other is a female buckle, which is fastened to the female buckle. In this way, by fastening the female buckle to the female buckle, the limiting guide can be held in a specific position of the belt body 1.

[0108] In summary, the seat belt device provided in this application embodiment has at least the following advantages: In this embodiment, an adjustment mechanism is provided between the belt body and the second locking member, or on the belt body. This adjustment mechanism has a first state in which the intersection point of the shoulder belt and the lap belt is located in a first position, and a second state in which the intersection point of the shoulder belt and the lap belt is located in a second position. The distance between the first position and the first locking member is smaller than the distance between the second position and the first locking member. That is, the intersection point position of the shoulder belt and the lap belt of the seat belt device can be changed. Thus, when the adjustment mechanism is in the first state, the intersection point of the shoulder belt and the lap belt can be kept close to the first locking member in the first position (i.e., the side of the occupant), thereby achieving reliable restraint of the occupant under normal vehicle operating conditions. When the adjustment mechanism is switched to the second state, the intersection point of the shoulder belt and the lap belt can be moved to a second position away from the first locking member (i.e., in front of the occupant). This allows the lower half of the shoulder belt to return to the front of the occupant under vehicle collision conditions, reducing or avoiding the lateral movement tendency of the upper half of the shoulder belt, thereby reducing the risk of the seat belt strangulation under vehicle collision conditions and improving the safety of the seat belt device.

[0109] This application also provides a vehicle seat assembly 200, including the seat belt device 100 of any of the above embodiments.

[0110] In this embodiment, by providing the aforementioned seat belt device 100, which includes an adjustment mechanism 4, and which has a first state where the intersection of the shoulder strap 11 and the lap belt 12 is located in a first position, and a second state where the intersection of the shoulder strap 11 and the lap belt 12 is located in a second position, with the distance between the first position and the first locking member 2 being smaller than the distance between the second position and the first locking member 2, when the adjustment mechanism 4 is in the first state, the intersection of the shoulder strap 11 and the lap belt 12 can be kept close to the first locking member 2, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, the intersection of the shoulder strap 11 and the waist belt 12 can be moved to a second position away from the first locking member 2. This allows the lower half of the shoulder strap 11 to return to the front of the occupant 300 in the event of a vehicle collision, reducing or avoiding the lateral movement tendency of the upper half of the shoulder strap 11. This can reduce the risk of the seat belt strangulation in the event of a vehicle collision and improve the safety of the seat belt device 100 and the vehicle seat assembly 200.

[0111] It should be noted that in this embodiment, the structure of the seat belt device 100 is the same as that of the seat belt device 100 in any of the above embodiments, and its beneficial effects are also similar, so it will not be described in detail here.

[0112] This application also provides a vehicle, including a seat belt device 100 of any of the above embodiments, or a vehicle seat assembly 200.

[0113] In this embodiment, by providing the aforementioned seat belt device 100 or vehicle seat assembly 200, the seat belt device 100 is equipped with an adjustment mechanism 4. This adjustment mechanism 4 has a first state where the intersection of the shoulder strap 11 and the lap belt 12 is located in a first position, and a second state where the intersection of the shoulder strap 11 and the lap belt 12 is located in a second position. The distance between the first position and the first locking member 2 is smaller than the distance between the second position and the first locking member 2. Thus, when the adjustment mechanism 4 is in the first state, the intersection of the shoulder strap 11 and the lap belt 12 can be kept close to the first locking member 2 in the first position, thereby achieving reliable restraint of the occupant 300 under normal vehicle operating conditions. When the adjustment mechanism 4 switches to the second state, the intersection of the shoulder strap 11 and the waist belt 12 can be moved to a second position away from the first locking member 2. This allows the lower half of the shoulder strap 11 to return to the front of the occupant 300 in the event of a vehicle collision, reducing or avoiding the lateral movement tendency of the upper half of the shoulder strap 11 and reducing the risk of the seat belt strangulation in the event of a vehicle collision. This can improve the safety of the seat belt device 100 and the vehicle seat assembly 200, and help improve the product competitiveness of the vehicle.

[0114] It should be noted that in the embodiments of this application, the structure of the seat belt device 100 or the vehicle seat assembly 200 is the same as that of the seat belt device 100 or the vehicle seat assembly 200 in any of the above embodiments, and their beneficial effects are also similar, so they will not be described in detail here.

[0115] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0116] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A seatbelt device applied to a vehicle seat assembly, the vehicle seat assembly having a first side and a second side disposed opposite to each other along its width direction, characterized in that, The seat belt device includes: A belt, the two ends of which are used to connect to the first side; A first locking element is used to connect to the second side; The second locking member is connected to the belt body and detachably connected to the first locking member. When the second locking member is connected to the first locking member, the belt body includes a shoulder strap for restraining the occupant's chest and a waist belt for restraining the occupant's waist. An adjustment mechanism is provided, disposed between the belt body and the second locking member, or disposed on the belt body. The adjustment mechanism has a first state and a second state. In the first state, the intersection of the shoulder strap and the waist belt is located at a first position. In the second state, the intersection of the shoulder strap and the waist belt is located at a second position. The first position and the second position are located between the first side and the second side, and the distance between the first position and the first locking member is less than the distance between the second position and the first locking member.

2. The seat belt device according to claim 1, characterized in that, The adjustment mechanism includes: a first adjustment member, which is disposed between the belt body and the second locking member and connected to the belt body and the second locking member; the first adjustment member has a first length and a second length, and the second length is greater than the first length. In the first state, the first adjustment member remains at the first length so that the intersection of the shoulder strap and the waist belt is located at the first position. In the second state, the first adjustment member switches to the second length so that the intersection of the shoulder strap and the waist belt moves to the second position.

3. The seat belt device according to claim 2, characterized in that, The first adjusting member includes at least two stacked adjusting parts, with adjacent adjusting parts connected; The fracture strength at the connection between two adjacent adjustment parts is less than the fracture strength of the adjustment part. In the first state, the two adjacent adjustment parts remain connected. In the second state, the connection between the two adjacent adjustment parts breaks, so that the first adjustment member switches from the first length to the second length. Alternatively, the adjustment mechanism may further include a first cut-off device disposed on the second locking member, the first cut-off device being used to cut off the connection between at least two of the adjustment parts, so that the first adjustment member switches from the first length to the second length; Alternatively, the adjustment mechanism may further include a second retractor for winding or releasing the first adjustment member to switch the first adjustment member between the first length and the second length.

4. The seat belt device according to claim 2, characterized in that, The adjustment mechanism further includes: a first guide member, which is sleeved on the belt and slidably connected to the belt; The end of the first adjusting member that is away from the second locking member is connected to the first guide member.

5. The seat belt device according to claim 1, characterized in that, The adjustment mechanism includes: at least one second adjustment member, and the second locking member is connected to one of the second adjustment members; In the first state, both ends of the second adjustment member are connected to the belt body, and the belt body partially overlaps or the belt body partially overlaps with the second adjustment member, so that the intersection of the shoulder strap and the waist belt is located in the first position; in the second state, at least one end of the second adjustment member is disconnected from the belt body, and the overlapping portion of the belt body or the overlapping portion of the belt body and the second adjustment member is at least partially released, so that the intersection of the shoulder strap and the waist belt moves to the second position.

6. The seat belt device according to claim 5, characterized in that, The second adjusting member includes a first sub-adjusting member, which includes a first end and a second end that are opposite to each other, and the second end is fixedly connected to the belt body; In the first state, the first end is connected to the belt body and is close to the upper end of the belt body so that the belt body partially overlaps with the first sub-adjustment. In the second state, the first end is disconnected from the belt body so that the portion of the belt body overlapping with the first sub-adjustment is released.

7. The seat belt device according to claim 5, characterized in that, The second adjusting member includes a second sub-adjusting member and a third sub-adjusting member. The second sub-adjusting member includes a third end and a fourth end that are opposite to each other. The third sub-adjusting member includes a fifth end and a sixth end that are opposite to each other. The fifth end is located between the third end and the fourth end, and the fourth end is located between the fifth end and the sixth end. The second locking member is connected to the second sub-adjusting member. In the first state, the third end, the fourth end, and the fifth end are movably connected to the belt body, and the sixth end is fixedly connected to the belt body. The third end and the fifth end are close to the upper end of the belt body so that the belt body partially overlaps. In the second state, the third end is disconnected from the belt body, so that the overlapping portion of the belt body is at least partially released.

8. The seat belt device according to claim 5, characterized in that, The second adjusting member includes a second sub-adjusting member and a third sub-adjusting member disposed on opposite sides of the belt body. The second sub-adjusting member includes a third end and a fourth end that are opposite to each other, and the third sub-adjusting member includes a fifth end and a sixth end that are opposite to each other. The second locking member includes a latch body and a connecting strip connected to each other. The connecting strip is disposed between the second sub-adjusting member and the strip body, and one end of the connecting strip away from the latch body is connected to the strip body. In the first state, the third end and the fifth end are movably connected to the same position of the belt body, the fourth end and the sixth end are fixedly connected to the same position of the belt body, and the third end and the fifth end are close to the upper end of the belt body, so that the belt body partially overlaps with the second sub-adjustment and the third sub-adjustment; In the second state, the third end or the third end and the fifth end are disconnected from the belt body, so that at least part of the portion of the belt body overlapping with the second sub-adjustment and the third sub-adjustment is released.

9. The seat belt device according to claim 8, characterized in that, The adjustment mechanism further includes: a first limiting member and a second limiting member; in the first state, the first limiting member is sleeved on the belt body and connected to the third end and the fifth end; in the second state, the first limiting member breaks to disconnect the third end or the third end and the fifth end from the belt body; the second limiting member is sleeved on the belt body and connected to the connecting belt, the fourth end and the sixth end; And / or, the second sub-adjustment includes two first edges extending along the length direction of the belt, the third sub-adjustment includes two second edges extending along the length direction of the belt, one of the first edges is connected to one of the second edges, and the breaking strength at the connection between at least one first edge and the corresponding second edge is less than the breaking strength of the second sub-adjustment and the third sub-adjustment.

10. The seatbelt device according to claim 9, characterized in that, The adjustment mechanism further includes a third cutter for cutting off the first limiting member.

11. The seatbelt device according to claim 5, characterized in that, In the second state, the end of the second adjusting member that is disconnected from the belt body is the target end; The fracture strength at the connection between the target end and the belt body is less than the fracture strength of the second adjusting member and the belt body; In the first state, the target end remains connected to the belt body; in the second state, the connection between the target end and the belt body breaks. Alternatively, the adjustment mechanism may further include a second cutter for cutting off the connection between the target end and the belt.

12. The seat belt device according to claim 1, characterized in that, The adjustment mechanism includes: a third locking element and a fourth locking element; The third locking member is connected to the belt body and located on the side of the second locking member near the upper end of the belt body. The fourth locking member is fixedly connected to the belt body and located on the side of the second locking member near the lower end of the belt body. In the first state, the third locking member and the fourth locking member are in an unlocked state, so that the intersection of the shoulder strap and the waist belt is located in the first position. In the second state, the third locking member and the fourth locking member are in a locked state, so that the intersection of the waist belt is located in the second position.

13. The seatbelt device according to claim 5 or 12, characterized in that, The end of the second adjusting member that is movably connected to the belt body is defined as the movable end, and the end that is fixedly connected to the belt body is defined as the fixed end; The adjustment mechanism further includes at least one first guide and one second guide sleeved on the belt body, the second guide being close to the lower end of the belt body, the first guide being slidably connected to the belt body, and the second guide being fixedly connected to the belt body; At least one of the movable ends or the third locking member is connected to one of the first guide members, and at least one of the fixed ends or the fourth locking member is connected to the second guide member.

14. The seatbelt device according to claim 13, characterized in that, The second guide member is provided with a first limiting part, and the belt body is provided with a plurality of second limiting parts, the second limiting parts being in limiting cooperation with the first limiting parts.

15. The seatbelt device according to claim 14, characterized in that, One of the first limiting part and the second limiting part is a limiting hole, and the other is a limiting pin, wherein the limiting pin is inserted into the limiting hole; Alternatively, one of the first limiting part and the second limiting part is a female buckle, and the other is a male buckle, wherein the male buckle is engaged with the female buckle.

16. A vehicle seat assembly, characterized in that, Includes the seat belt device as described in any one of claims 1-15.

17. A vehicle, characterized in that, Includes the seat belt device as described in any one of claims 1-15, or the vehicle seat assembly as described in claim 16.

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