Safety belt pretensioner, safety belt assembly, seat assembly, and vehicle

Abstract

The application discloses a seat belt pretensioner, a seat belt assembly, a seat assembly and a vehicle. The seat belt pretensioner comprises a housing, a reel, a first locking member, a second locking member and a locking element. When the reel rotates in a first direction, a gap is formed between the locking element and the second locking member. When the reel rotates in a second direction, the locking element is adapted to abut against the second locking member and the first locking member to limit the relative rotation of the second locking member and the first locking member. According to the seat belt pretensioner, the second locking member is additionally arranged, the locking element is arranged in the accommodating space between the first locking member and the second locking member, the gap is kept between the locking element and the second locking member when the reel rotates in the first direction, the friction between the locking element, the second locking member and the housing is avoided, the deformation and damage of the locking element are prevented, and the damage of the housing caused by the extrusion of the locking element is avoided when the reel rotates in the second direction.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a seat belt pretensioner, a seat belt assembly, a seat assembly, and a vehicle. Background Technology

[0002] In related technologies, a seat belt pretensioning device includes a housing, a reel, a first locking member, and a locking element. The first locking member is fixedly connected to the reel, and a locking element is provided between the first locking member and the housing. When the reel rotates in a first direction, it winds up the seat belt. When the reel rotates in a second direction, the locking effect between the locking element and the first locking member and the housing prevents the reel from continuing to rotate in the second direction. However, in related technologies, damage to the locking element or the housing is prone to occur. Summary of the Invention

[0003] This application aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, this application proposes a seatbelt pretensioning device that helps to prevent deformation and damage to the locking elements and housing.

[0004] This application also proposes a seat belt assembly having the aforementioned seat belt pretensioner.

[0005] This application also proposes a seat assembly having the above-mentioned seat belt pretensioner or the above-mentioned seat belt assembly.

[0006] This application also proposes a vehicle having the aforementioned seat belt pretensioner, seat belt assembly, or seat assembly.

[0007] A seatbelt pretensioning device according to a first aspect of this application includes a housing, a reel, a first locking member, a second locking member, and a locking element. The reel is rotatably disposed in the housing. When driven, the reel can rotate in a first direction to wind up a seatbelt. One of the first locking member and the second locking member is fixed to the housing, and the other is fixedly connected to the reel. At least one receiving space is formed between the first locking member and the second locking member. The locking element is disposed in a corresponding receiving space. When the reel rotates in the first direction, there is a gap between the locking element and the second locking member. When the reel rotates in a second direction, the locking element is adapted to abut against the second locking member and the first locking member to limit the relative rotation between the second locking member and the first locking member. The first direction and the second direction are opposite directions.

[0008] According to the embodiment of the present application, the seat belt pretensioning device adds a second locking member and places the locking element in the receiving space between the first locking member and the second locking member. When the reel rotates in the first direction, a gap is maintained between the locking element and the second locking member, which avoids friction between the locking element and the second locking member and the housing, thereby preventing deformation and damage of the locking element. When the reel rotates in the second direction, it avoids the locking element squeezing the housing and causing damage to the housing.

[0009] According to some embodiments of this application, the first locking member includes a body portion, the second locking member has a mounting cavity, the body portion is disposed in the mounting cavity, and the accommodating space is formed between the body portion and the cavity wall of the mounting cavity.

[0010] According to some embodiments of this application, the main body is provided with at least one drive groove, each drive groove including a locking surface and a limiting surface, the locking surface and the limiting surface being connected, the receiving space being formed between the locking surface, the limiting surface and the cavity wall of the mounting cavity, and when the spool rotates along the second direction, the locking element abuts against the locking surface and the cavity wall of the mounting cavity.

[0011] According to some embodiments of this application, the cavity wall of the mounting cavity includes an annular cavity wall that surrounds the circumferential outer side of the body portion. The annular cavity wall is disposed opposite to the locking surface, and the distance between the locking surface and the annular cavity wall gradually decreases in the direction from one end of the locking surface near the limiting surface to the end away from the limiting surface.

[0012] According to some embodiments of this application, in any cross-section perpendicular to the axial direction of the reel, the locking element is circular, and within the same cross-section, the minimum distance between the locking surface and the annular cavity wall is less than the diameter of the circle, and the maximum distance between the locking surface and the annular cavity wall is greater than the diameter of the circle.

[0013] According to some embodiments of this application, the locking surface is a plane, the locking surface is parallel to the rotation axis of the spool, and the shortest line connecting any point on the locking surface to the rotation axis of the spool and the normal of the locking surface at that point has an angle α, satisfying 90°<α<180°.

[0014] According to some embodiments of this application, there are multiple drive slots, which are spaced apart in the circumferential direction of the first locking member.

[0015] According to some embodiments of this application, the first locking member further includes a first shaft portion connected to one end of the body portion. The second locking member is provided with a first shaft hole communicating with the mounting cavity. The inner diameter of the annular cavity wall is larger than the diameter of the first shaft hole. The first shaft portion passes through the first shaft hole. When the spool rotates along the first direction, the distance between the first shaft portion and the first shaft hole is less than the minimum distance between the locking element and the second locking member.

[0016] According to some embodiments of this application, the first locking member further includes a second shaft portion connected to the other end of the body portion. The housing includes a first side plate for enclosing the mounting cavity. The first side plate is provided with a second shaft hole communicating with the mounting cavity. The inner diameter of the annular cavity wall is larger than the diameter of the second shaft hole. The second shaft portion passes through the second shaft hole. When the spool rotates along the first direction, the distance between the second shaft portion and the second shaft hole is less than the minimum distance between the locking element and the second locking member.

[0017] According to some embodiments of this application, the inner diameter of the annular cavity wall is greater than the maximum outer diameter of the body portion; and / or, the radius of the first shaft hole is less than the shortest distance between the locking surface and the rotation axis of the reel.

[0018] According to some embodiments of this application, the seat belt pretensioning device further includes a driving device for driving the reel to rotate along the first direction.

[0019] The seat belt assembly according to the second aspect of this application includes the seat belt pretensioner described above.

[0020] According to the embodiment of the present application, the seat belt assembly has a seat belt pretensioning device that adds a second locking member and places the locking element in the receiving space between the first locking member and the second locking member. When the reel rotates in the first direction, a gap is maintained between the locking element and the second locking member, which avoids friction between the locking element and the second locking member and the housing, thereby preventing deformation and damage of the locking element. When the reel rotates in the second direction, it avoids the locking element from squeezing the housing and causing damage to the housing.

[0021] The seat assembly according to the third aspect of this application includes the seat belt pretensioner described above, or includes the seat belt assembly described above.

[0022] According to the embodiment of the present application, the seat assembly has a seat belt pretensioner that adds a second locking member and places the locking element in the receiving space between the first locking member and the second locking member. When the spool rotates in the first direction, a gap is maintained between the locking element and the second locking member, which avoids friction between the locking element and the second locking member and the housing, thereby preventing deformation and damage of the locking element. When the spool rotates in the second direction, it avoids the locking element from squeezing the housing and causing damage to the housing.

[0023] A vehicle according to a fourth aspect of this application includes the aforementioned seatbelt pretensioner, or the aforementioned seatbelt assembly, or the aforementioned seat assembly.

[0024] According to the embodiments of the present application, the vehicle's seat belt pretensioning device adds a second locking member, and the locking element is disposed in the receiving space between the first locking member and the second locking member. When the spool rotates in the first direction, a gap is maintained between the locking element and the second locking member, which avoids friction between the locking element and the second locking member and the housing, thereby preventing deformation and damage of the locking element. When the spool rotates in the second direction, it avoids the locking element squeezing the housing and causing damage to the housing.

[0025] According to some embodiments of this application, the vehicle further includes a seat belt connected to the reel, the reel being driven to rotate in the first direction to wind up the seat belt, and the vehicle further includes a seat belt retractor, the seat belt pretensioning device being connected to the same seat belt as the seat belt retractor.

[0026] 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

[0027] Figure 1 This is a front view of a seatbelt pretensioner according to an embodiment of this application; Figure 2 This is a perspective view of a seatbelt pretensioning device according to an embodiment of this application; Figure 3 This is a cross-sectional view of a seatbelt pretensioner according to an embodiment of this application; Figure 4 This is a cross-sectional view of the seat belt pretensioner according to an embodiment of this application from another perspective; Figure 5 It is based on Figure 4 A magnified view of a portion at point A shown; Figure 6 This is a schematic diagram of the first locking member according to an embodiment of this application; Figure 7This is a schematic diagram of the first locking member according to an embodiment of this application from another perspective; Figure 8 This is a schematic diagram of the second locking member according to an embodiment of this application; Figure 9 This is a cross-sectional view of the second locking member according to an embodiment of this application from another perspective; Figure 10 This is a perspective view of the housing according to an embodiment of this application; Figure 11 This is a cross-sectional view of the housing according to an embodiment of this application; Figure 12 This is a schematic diagram of a seat belt assembly according to an embodiment of this application; Figure 13 This is a schematic diagram of a seat assembly according to the first embodiment of this application; Figure 14 This is a schematic diagram of a seat assembly according to a second embodiment of this application; Figure 15 This is a schematic diagram of a vehicle according to the first embodiment of this application; Figure 16 This is a schematic diagram of a vehicle according to the second embodiment of this application; Figure 17 This is a schematic diagram of a vehicle according to the third embodiment of this application.

[0028] Figure label: Vehicle 100, seat assembly 30, seat belt assembly 20, seat belt pretensioner 10, housing 1, first side plate 11, second shaft hole 111, second mounting hole 112, spool 2, first locking element 3, body part 31, locking surface 311, limiting surface 312, first shaft part 32, second shaft part 33, second locking element 4, mounting cavity 41, annular cavity wall 411, first shaft hole 42, first mounting hole 43, locking element 5, accommodating space 6. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown 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 intended to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] The following is combined with Figures 1-17 The present application describes in detail a seat belt pretensioner 10, a seat belt assembly 20 having the seat belt pretensioner 10, a seat assembly 30 having the seat belt pretensioner 10 or the seat belt assembly 20, and a vehicle 100 having the seat belt pretensioner 10, the seat belt assembly 20, or the seat assembly 30, according to embodiments of the present application.

[0032] Reference Figures 1-4 As shown, the seat belt pretensioning device 10 according to the first aspect embodiment of this application includes a housing 1, a reel 2, a first locking member 3, a second locking member 4, and a locking element 5. The reel 2 is rotatably disposed on the housing 1. When the reel 2 is driven, it can rotate in a first direction to wind up the seat belt. One of the first locking member 3 and the second locking member 4 is fixed to the housing 1, and the other is fixedly connected to the reel 2. At least one receiving space 6 is formed between the first locking member 3 and the second locking member 4, and the locking element 5 is disposed in the corresponding receiving space 6. When the reel 2 rotates in the first direction, there is a gap between the locking element 5 and the second locking member 4. When the reel 2 rotates in a second direction, the locking element 5 is adapted to abut against the second locking member 4 and the first locking member 3 to limit the relative rotation of the second locking member 4 and the first locking member 3. The first direction and the second direction are opposite directions.

[0033] Specifically, a second locking element 4 is added to the seat belt pretensioning device 10. At least one receiving space 6 is formed between the first locking element 3 and the second locking element 4. When the reel 2 rotates in the first direction, a gap is maintained between the locking element 5 and the second locking element 4, which can prevent friction between the locking element 5 and the second locking element 4, thereby preventing deformation and damage of the locking element 5. When the spool 2 rotates in the second direction, the locking element 5 directly abuts against the first locking member 3 and the second locking member 4, restricting the relative rotation of the first locking member 3 and the second locking member 4. Since one of the first locking member 3 and the second locking member 4 is fixed to the housing 1 and the other is connected to the spool 2, the spool 2 cannot continue to rotate in the second direction, thus locking the spool 2 and preventing the rolled-up seat belt from being pulled out. At this time, the locking element 5 squeezes the second locking member 4, thereby avoiding damage to the housing 1 caused by the locking element 5 squeezing the housing 1. When the second locking member 4 is damaged by the squeezing of the locking element 5, only the second locking member 4 can be replaced, avoiding waste of the housing 1 and making disassembly more convenient.

[0034] The locking logic of the locking element 5 is based on the self-triggering of the mechanical structure and is not affected by environmental factors, which increases the applicability of the seat belt pretensioner 10.

[0035] It is important to understand that when a user uses the seatbelt, the reel 2 rotates in the first direction to wind up the seatbelt, allowing it to fit more tightly against the user and achieving a pretensioning effect. Therefore, the first direction can also be called the pretensioning direction. During the rotation of the reel 2 in the second direction, the locking element 5 gradually comes into contact with the first locking member 3 and the second locking member 4, causing them to press against each other, preventing the reel 2 from continuing to rotate in the second direction. This achieves locking of the reel 2 in the second direction; therefore, the second direction can also be called the locking direction. The first direction is the opposite of the second direction. For example, see [reference needed]. Figure 3 As shown, the first direction is Figure 3 The middle direction is counterclockwise, and the second direction is... Figure 3 Clockwise direction.

[0036] See Figure 1 As shown, the straight line M is the rotation axis of the spool 2, and also the rotation axis of the first locking member 3.

[0037] In related technologies, the seat belt pretensioning device includes a housing, a reel, a first locking member, and a locking element. The first locking member is fixedly connected to the reel, and a locking element is provided between the first locking member and the housing. When the reel rotates in a first direction, it winds up the seat belt. At this time, the locking element is prone to collision with the housing due to vehicle vibration, which can cause damage to the locking element. When the reel rotates in a second direction, the locking effect between the locking element, the first locking member, and the housing prevents the reel from continuing to rotate in the second direction. At this time, the locking element will squeeze the housing, which can easily cause damage to the housing.

[0038] According to the embodiment of the present application, the seat belt pretensioning device 10, by adding a second locking member 4, places the locking element 5 in the receiving space 6 between the first locking member 3 and the second locking member 4. When the reel 2 rotates in the first direction, a gap is maintained between the locking element 5 and the second locking member 4, which avoids friction between the locking element 5 and the second locking member 4 and the housing 1, thereby preventing deformation and damage of the locking element 5. When the reel 2 rotates in the second direction, it avoids the locking element 5 from squeezing the housing 1 and causing damage to the housing 1.

[0039] It should be noted that all fixing methods in this application can be bolt fixing, riveting fixing, welding, etc., which will not be listed here. For example Figure 4 , Figures 8-10As shown, the second locking member 4 has a first mounting hole 43, and the first side plate 11 has a second mounting hole 112. Fasteners are inserted through the first mounting hole 43 and the second mounting hole 112 to fix the second locking member 4 to the housing 1. The fasteners can be bolts, screws, rivets, etc.

[0040] In some embodiments, the first locking member 3, the second locking member 4, and the locking element 5 together constitute a locking mechanism. During the rotation of the spool 2 in the second direction, the locking mechanism engages to lock the spool 2 (i.e., the spool 2 cannot continue to rotate in the second direction).

[0041] In some embodiments of this application, see Figures 6-9 As shown, the first locking member 3 includes a body portion 31, and the second locking member 4 has a mounting cavity 41. The body portion 31 is disposed within the mounting cavity 41, and a receiving space 6 is formed between the body portion 31 and the cavity wall of the mounting cavity 41. Specifically, the body portion 31 is directly placed within the mounting cavity 41 of the second locking member 4, and the receiving space 6 is enclosed by the body portion 31 and the cavity wall of the mounting cavity 41, avoiding spatial offset caused by assembly deviation. Furthermore, no additional positioning structure is required; positioning is achieved directly through the nested cooperation of the body portion 31 and the mounting cavity 41, reducing the number of parts and simplifying the assembly process.

[0042] In some embodiments of this application, see Figure 6 As shown, the main body 31 is provided with at least one drive groove. Each drive groove includes a locking surface 311 and a limiting surface 312. The locking surface 311 and the limiting surface 312 are connected. The accommodating space 6 is formed between the locking surface 311, the limiting surface 312 and the cavity wall of the mounting cavity 41. When the scroll 2 rotates in the second direction, the locking element 5 abuts against the locking surface 311 and the cavity wall of the mounting cavity 41.

[0043] Specifically, the locking surface 311 and the limiting surface 312 of the drive groove provide a clear force guide for the locking element 5.

[0044] When the scroll 2 rotates in the first direction, it drives the first locking member 3 to rotate in the first direction, and the limiting surface 312 can push the locking element 5 to rotate in the first direction.

[0045] When the spool 2 rotates in the second direction, the locking element 5 can quickly fit against the locking surface 311 and abut against the cavity wall of the mounting cavity 41, so that the first locking element 3 and the second locking element 4 cannot rotate relative to each other, thereby preventing the spool 2 from continuing to rotate in the second direction.

[0046] In some embodiments of this application, see Figure 3 , Figure 4 , Figure 8 , Figure 9As shown, the cavity wall of the mounting cavity 41 includes an annular cavity wall 411, which surrounds the circumferential outer side of the body portion 31. The annular cavity wall 411 is disposed opposite to the locking surface 311. In the direction from one end of the locking surface 311 near the limiting surface 312 corresponding to the same driving groove to the end away from the limiting surface 312, the distance between the locking surface 311 and the annular cavity wall 411 gradually decreases.

[0047] Specifically, the locking surface 311 and the annular cavity wall 411 form a wedge-shaped receiving space 6 (e.g., Figure 3 As shown, the uppermost receiving space 6, from right to left, forms a space that narrows from wide to narrow. When the scroll 2 rotates in the second direction, the locking element 5 moves towards the narrower end relative to the wedge-shaped receiving space 6. It can quickly abut against the locking surface 311 and the annular cavity wall 411 without the need for additional guide structures. As the scroll 2 rotates in the second direction, the locking element 5 becomes increasingly tighter in the wedge-shaped receiving space 6. The squeezing force of the locking surface 311 and the annular cavity wall 411 on the locking element 5 gradually increases, forming a progressive locking effect. The locking strength increases synchronously with the rotation angle of the scroll 2. Finally, the scroll 2 stops rotating in the second direction.

[0048] The contact pressure between the locking element 5 and the locking surface 311 and the annular cavity wall 411 is more uniform, avoiding excessive force at a single point, while enhancing the impact resistance of the locking structure and making it more reliable in dealing with strong loads during collisions.

[0049] In some embodiments, the cavity wall of the mounting cavity 41 is an annular cavity wall 411, and the axis of the annular cavity wall 411 is collinear with the rotation axis of the first locking member 3.

[0050] It should be understood that the "distance between the locking surface 311 and the annular cavity wall 411" mentioned above refers to the shortest distance from a point on the locking surface 311 to the annular cavity wall 411.

[0051] In some embodiments of this application, see Figure 3 As shown, in any cross section perpendicular to the axial direction of the scroll 2, the locking element 5 is circular. Within the same cross section, the minimum distance between the locking surface 311 and the annular cavity wall 411 is less than the diameter of the circle, and the maximum distance between the locking surface 311 and the annular cavity wall 411 is greater than the diameter of the circle.

[0052] In other words, the projection of the locking element 5 onto a plane perpendicular to the axis of the scroll 2 is circular.

[0053] The maximum distance between the locking surface 311 and the annular cavity wall 411 is greater than the diameter of the circle mentioned above, ensuring that when the scroll 2 rotates in the first direction, the locking element 5 has sufficient room for movement in the accommodating space 6, maintaining a gap with the locking surface 311 or the annular cavity wall 411, reducing friction and wear.

[0054] The minimum distance between the locking surface 311 and the annular cavity wall 411 is less than the diameter of the aforementioned circle. When the scroll 2 rotates in the second direction, the locking element 5 moves along the wedge-shaped receiving space 6 to the narrow end, where it will be precisely clamped by the locking surface 311 and the annular cavity wall 411, forming a reliable lock and avoiding the problem of locking but not being tight.

[0055] Optionally, the locking element 5 can be a cylinder, cone, sphere, etc. For example... Figure 3 , Figure 4 As shown, the locking element 5 is a cylinder, which has better applicability and strength.

[0056] In some embodiments of this application, see Figure 6 As shown, the locking surface 311 is a plane, and the locking surface 311 is parallel to the rotation axis of the scroll 2. The shortest line connecting any point on the locking surface 311 to the rotation axis of the scroll 2 (e.g.) Figure 6 As shown in L1), the normal of the locking surface 311 at that point (e.g.) Figure 6 The L2 shown has an included angle α, which satisfies 90°<α<180°.

[0057] Specifically, the locking surface 311 is parallel to the rotation axis of the scroll 2. When the scroll 2 rotates in the second direction, the first locking member 3 can exert a pushing force on the locking element 5 along the normal direction of the locking surface 311 through the locking surface 311. With the included angle design of 90° < α < 180°, this pushing force can drive the locking element 5 to move towards the annular cavity wall 411 while rotating in the second direction. At this time, the distance between the locking surface 311 and the annular cavity wall 411 gradually decreases until the locking element 5 simultaneously abuts against the locking surface 311 and the annular cavity wall 411. The locking strength increases synchronously with the rotation angle of the scroll 2, and finally the scroll 2 stops rotating in the second direction.

[0058] Optionally, the included angle α can be 105°, 120°, 145°, 150°, 165°, etc.

[0059] In some embodiments of this application, see Figure 6 As shown, there are multiple drive slots, which are spaced apart in the circumferential direction of the first locking member 3. Specifically, the multiple drive slots correspond to multiple locking elements 5. When locking, the multiple sets of locking elements 5 cooperate to bear force simultaneously, and the torque of the roller 2 rotating in the second direction is evenly distributed to each locking element 5 in the circumferential direction. This avoids stress concentration in a single locking element 5, reduces the load on a single drive slot and locking element 5, reduces the risk of local wear and deformation, and extends the overall service life of the seat belt pretensioning device 10.

[0060] Optionally, the number of locking elements 5 can be one, two, three, four, five, six, seven, eight, or more. For example... Figure 3 As shown, the number of locking elements 5 is eight. Similarly, the number of drive slots can also be one, two, three, four, five, six, seven, eight or more.

[0061] In some embodiments of this application, see Figure 4 , Figure 5 , Figure 7 , Figure 9 As shown, the first locking member 3 also includes a first shaft portion 32, which is connected to one end of the main body portion 31. The second locking member 4 is provided with a first shaft hole 42 that communicates with the mounting cavity 41. The inner diameter d4 of the annular cavity wall 411 is larger than the diameter d5 of the first shaft hole 42. The first shaft portion 32 passes through the first shaft hole 42. When the scroll 2 rotates in the first direction, the distance d1 between the first shaft portion 32 and the first shaft hole 42 is smaller than the minimum distance d2 between the locking element 5 and the second locking member 4.

[0062] Specifically, when the spool 2 rotates in the first direction, the distance d1 between the first shaft portion 32 and the first shaft hole 42 is less than the minimum distance d2 between the locking element 5 and the second locking member 4. This ensures that the locking element 5 will not touch the annular cavity wall 411 of the second locking member 4 due to vibration of the vehicle 100 or slight shaking of the spool 2. This completely eliminates unnecessary friction of the locking element 5 when rotating in the first direction, and avoids wear and deformation of the main body portion 31 of the locking element 5 and the first locking member 3, thereby affecting the pretensioning and locking performance of the seat belt pretensioning device 10.

[0063] The structure of the first shaft portion 32 passing through the first shaft hole 42 provides coaxial positioning for the mounting cavity 41 of the body portion 31 and the second locking member 4, ensuring that the circumferential gap between the annular cavity wall 411 and the body portion 31 is uniform. Combined with the circumferential distribution of the multiple drive grooves, the movement trajectory of the locking element 5 is more regular.

[0064] The inner diameter d4 of the annular cavity wall 411 is larger than the diameter d5 of the first shaft hole 42, forming a stepped structure. This provides sufficient space 6 for the locking element 5 and, through the constraint of the first shaft part 32 by the first shaft hole 42, prevents the body part 31 from shifting, ensuring that the seat belt pretensioning device 10 works without jamming.

[0065] In some embodiments of this application, see Figure 4 , Figure 5 , Figure 7 , Figure 10 , Figure 11As shown, the first locking member 3 also includes a second shaft portion 33, which is connected to the other end of the main body portion 31. The housing 1 includes a first side plate 11, which is used to enclose the mounting cavity 41. The first side plate 11 is provided with a second shaft hole 111 that communicates with the mounting cavity 41. The inner diameter d4 of the annular cavity wall 411 is greater than the diameter d6 of the second shaft hole 111. The second shaft portion 33 passes through the second shaft hole 111. When the scroll 2 rotates in the first direction, the distance d3 between the second shaft portion 33 and the second shaft hole 111 is less than the minimum distance d2 between the locking element 5 and the second locking member 4.

[0066] Specifically, when the reel 2 rotates in the first direction, the distance d3 between the second shaft portion 33 and the second shaft hole 111 is less than the minimum distance d2 between the locking element 5 and the second locking member 4. This ensures that the locking element 5 will not touch the annular cavity wall 411 of the second locking member 4 due to vibration of the vehicle 100 or slight shaking of the reel 2, completely eliminating unnecessary friction of the locking element 5 when rotating in the first direction and preventing wear of the locking element 5. The first shaft portion 32 and the first shaft hole 42, and the second shaft portion 33 and the second shaft hole 111 form a double tight fit, providing a more stable limiting reference for the locking element 5. Even if the seat belt pretensioner 10 vibrates violently or the reel 2 shakes, the bidirectional constraint (i.e., the constraint of the first shaft hole 42 on the first shaft portion 32 and the constraint of the second shaft hole 111 on the second shaft portion 33) can keep the locking element 5 firmly in a position with a gap from the annular cavity wall 411, without touching the second locking member 4, further preventing wear and deformation of the locking element 5.

[0067] The first shaft portion 32 engages with the first shaft hole 42, and the second shaft portion 33 engages with the second shaft hole 111, forming a positioning structure supported at both ends, thus preventing circumferential displacement of the main body portion 31 during rotation. The gap between the annular cavity wall 411 and the main body portion 31 is uniform in the circumferential direction, the accommodating space 6 corresponding to each drive groove has a uniform size, and the movement trajectory of the locking element 5 is more regular.

[0068] In some embodiments of this application, see Figure 6 , Figure 9 As shown, the inner diameter d4 of the annular cavity wall 411 is greater than the maximum outer diameter d7 of the body part 31; and / or, the radius of the first shaft hole 42 is less than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2.

[0069] In some embodiments, the inner diameter d4 of the annular cavity wall 411 is greater than the maximum outer diameter d7 of the body portion 31. For example... Figure 5 , Figure 6 , Figure 9As shown, the inner diameter d4 of the annular cavity wall 411 is slightly larger than the maximum outer diameter d7 of the body part 31. That is, the inner diameter d4 of the annular cavity wall 411 and the maximum outer diameter d7 of the body part 31 are designed with a small difference. This difference can only meet the installation and movement requirements of the locking element 5 and will not produce any extra clearance.

[0070] Specifically, the dimensional difference between the inner diameter d4 of the annular cavity wall 411 and the maximum outer diameter d7 of the body 31 provides sufficient circumferential movement space for the locking element 5, ensuring that the locking element 5 moves smoothly along the locking surface 311 within the receiving space 6 without jamming or obstruction due to insufficient space. The dimensional difference between the inner diameter d4 of the annular cavity wall 411 and the maximum outer diameter d7 of the body 31 can also accommodate minor deviations during processing and assembly, while avoiding direct contact between the body 31 and the annular cavity wall 411, thus eliminating frictional wear between them.

[0071] In some embodiments, the radius of the first shaft hole 42 is less than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2. For example Figure 5 , Figure 6 , Figure 9 As shown, the radius of the first shaft hole 42 is slightly smaller than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2. That is, the radius of the first shaft hole 42 and the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2 are designed with a small difference, which can just limit the body part 31 without wasting extra space.

[0072] Specifically, the radius of the first shaft hole 42 is smaller than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2, which limits the radial range of the first shaft hole 42, so that the body part 31 will not invade the first shaft hole 42, ensuring that the locking element 5 can always be in the receiving space 6, and the positioning function of the first shaft part 32 and the force-bearing function of the locking surface 311 do not interfere with each other.

[0073] In some embodiments, see Figure 6 , Figure 9 As shown, the inner diameter d4 of the annular cavity wall 411 is greater than the maximum outer diameter d7 of the body part 31, and the radius of the first shaft hole 42 is less than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2.

[0074] Specifically, by ensuring the degree of freedom of movement of the locking element 5 through d4 > d7, and by making the radius of the first shaft hole 42 smaller than the shortest distance d8 between the locking surface 311 and the rotation axis of the scroll 2, the second locking member 4 is formed in a radial hierarchical structure in the axial direction of the scroll 2, making the strength distribution of the second locking member 4 more scientific. The positioning part (first shaft hole 42) and the force-bearing part (annular cavity wall 411) each perform their respective functions, thereby improving the impact resistance and deformation resistance of the second locking member 4.

[0075] In some embodiments, see Figure 5 As shown, the outer peripheral surface of the main body 31 and the inner surface of the first side plate 11 ( Figure 5 The right side and the cavity wall of the mounting cavity 41 of the second locking element 4 together enclose the receiving space 6. The closed receiving space 6 can effectively prevent the locking element 5 from moving in the axial direction and rotating in the radial direction.

[0076] In some embodiments not shown in the figures, the seatbelt pretensioning device 10 further includes a drive device for driving the reel 2 to rotate in a first direction. In other words, the drive device can drive the reel 2 to rotate in the first direction so that the reel 2 can drive the seatbelt to wind up; the drive device can also be referred to as a pretensioning mechanism.

[0077] Specifically, the drive unit provides continuous and stable power for the rotation of the reel 2 in the first direction, eliminating the need for manual intervention and ensuring that the seat belt can be quickly and evenly wound up, achieving an effective pretensioning effect. Simultaneously, when the seat belt pretensioning device 10 is applied to the vehicle 100, the drive unit can be linked with the vehicle 100's safety system. In the event of a collision, the drive unit is quickly triggered, driving the reel 2 to instantly wind up the slack seat belt, shortening the pretensioning time and providing more timely restraint of the occupant's body compared to passive winding. This avoids the potential problems of insufficient power and response delay that may occur with passive winding, reducing the risk of injury.

[0078] In some embodiments not shown in the figures, the driving device includes a driving member, a transmission member, and a housing. The driving member includes a pump, and a sealed cavity is formed inside the housing. The driving member is disposed inside the sealed cavity and drives the transmission member. The driving member is adapted to drive the roller 2 to rotate in a first direction through the transmission member.

[0079] Specifically, the pump, as a driving component, has high power density and can provide continuous and controllable driving force. This force is precisely transmitted to the reel 2 through the transmission component, ensuring that the seat belt winding speed and force are uniform and the pre-tensioning effect is predictable.

[0080] The outer casing forms a sealed cavity, which seals and isolates the pump, effectively preventing external impurities such as dust, water vapor, and oil from entering and avoiding wear, short circuits, or malfunctions of the drive components.

[0081] The transmission component, as an intermediate connecting structure, can flexibly match the installation positions of the pump and the reel 2, solving the space limitations of direct connection between the two and making the layout of the drive unit more flexible.

[0082] In some embodiments, the seat belt pretensioning device 10 further includes a warning triggering device connected to the drive device. When the seat belt pretensioning device 10 is applied to the vehicle 100, in emergency situations such as a collision of the vehicle 100, the warning triggering device is triggered, causing the drive device to start working. The drive component in the drive device is adapted to drive the reel 2 to rotate in a first direction so that the seat belt is wound up.

[0083] In related technologies, in seat belt pretensioning devices, the first locking element has a locking position and a releasing position. The locking position and the releasing position have a radial positional difference. Moving from the locking position to the releasing position requires radial movement of the first locking element, which poses a risk of locking failure and affects pretensioning performance. The seat belt pretensioning device 10 of this application, by setting a locking element 5, eliminates the need for radial movement of the first locking element 3. It can complete the pretensioning of the seat belt when the reel 2 moves in the first direction. When the reel 2 moves in the second direction, the locking element 5, in cooperation with the locking surface 311 and the annular cavity wall 411, locks the reel 2, avoiding the risk of locking failure, improving pretensioning performance, and preventing the seat belt from instantly coming off the reel 2.

[0084] In related technologies, the reel and the first locking component are designed as a single unit, requiring the assistance of springs for positioning during the assembly of the seat belt pretensioner. This single-unit design necessitates ample space, and the strength of the remaining structure within the seat belt pretensioner is often insufficient to meet design requirements. In contrast, the first locking component 3 and the reel 2 in this application are designed as separate units, reducing the need for springs and other auxiliary positioning components, thus providing more space for the arrangement of the remaining structure within the seat belt pretensioner 10.

[0085] See Figure 12 As shown, the seat belt assembly 20 according to the second aspect of this application includes the seat belt pretensioner 10 described above.

[0086] According to the embodiment of this application, the seat belt assembly 20 has a seat belt pretensioning device 10 that adds a second locking member 4 and places the locking element 5 in the receiving space 6 between the first locking member 3 and the second locking member 4. When the reel 2 rotates in the first direction, a gap is maintained between the locking element 5 and the second locking member 4, which avoids friction between the locking element 5 and the second locking member 4 and the housing 1, thereby preventing deformation and damage of the locking element 5. When the reel 2 rotates in the second direction, the locking element 5 is prevented from squeezing the housing 1, which would cause damage to the housing 1.

[0087] See Figure 13 , Figure 14 As shown, the seat assembly 30 according to the third aspect of this application includes the seat belt pretensioner 10 described above, or includes the seat belt assembly 20 described above.

[0088] According to the embodiment of the present application, the seat assembly 30 has a seat belt pretensioning device 10 that adds a second locking member 4 and places the locking element 5 in the receiving space 6 between the first locking member 3 and the second locking member 4. When the roller 2 rotates in the first direction, a gap is maintained between the locking element 5 and the second locking member 4, which avoids friction between the locking element 5 and the second locking member 4 and the housing 1, thereby preventing deformation and damage of the locking element 5. When the roller 2 rotates in the second direction, it avoids the locking element 5 from squeezing the housing 1 and causing damage to the housing 1.

[0089] See Figures 15-17 As shown, the vehicle 100 according to the fourth aspect of this application includes the above-described seat belt pretensioner 10, or the above-described seat belt assembly 20, or the above-described seat assembly 30.

[0090] According to the embodiment of the present application, the vehicle 100 has a seat belt pretensioning device 10 that adds a second locking member 4 and places the locking element 5 in the receiving space 6 between the first locking member 3 and the second locking member 4. When the spool 2 rotates in the first direction, a gap is maintained between the locking element 5 and the second locking member 4, which avoids friction between the locking element 5 and the second locking member 4 and the housing 1, thereby preventing deformation and damage of the locking element 5. When the spool 2 rotates in the second direction, the locking element 5 is prevented from squeezing the housing 1, which would cause damage to the housing 1.

[0091] In some embodiments of this application, the vehicle 100 also includes a seat belt connected to a reel 2. When driven, the reel 2 is adapted to rotate in a first direction to wind up the seat belt. The vehicle 100 also includes a seat belt retractor, and a seat belt pretensioner 10 is connected to the seat belt retractor on the same seat belt. Specifically, the seat belt is directly associated with the reel 2. When the drive device drives the reel 2 to wind up, it can instantly tighten the slack portion of the seat belt, quickly conforming to the user's body and forming effective restraint. The seat belt pretensioner 10 and the seat belt retractor are connected to the same seat belt, forming a dual control logic of winding and pretensioning. The seat belt retractor is responsible for daily automatic retraction and length adjustment, while the seat belt pretensioner 10 focuses on rapid tightening in emergency situations. The functions are clearly divided and seamlessly integrated.

[0092] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0093] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0095] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A seatbelt pretensioning device (10), characterized in that, include: Shell (1); A reel (2) is rotatably disposed on the housing (1) and is driven to rotate in a first direction to wind up the seat belt. First locking element (3); The second locking member (4) is fixed to the housing (1) by one of the first locking member (3) and the second locking member (4), and the other is fixedly connected to the scroll (2). At least one receiving space (6) is formed between the first locking member (3) and the second locking member (4). Locking element (5), the locking element (5) is disposed in the corresponding receiving space (6); When the spool (2) rotates in the first direction, there is a gap between the locking element (5) and the second locking member (4). When the spool (2) rotates in the second direction, the locking element (5) is adapted to abut against the second locking member (4) and the first locking member (3) to restrict the relative rotation of the second locking member (4) and the first locking member (3). The first direction and the second direction are opposite directions.

2. The seat belt pretensioning device (10) according to claim 1, characterized in that, The first locking member (3) includes a body part (31), and the second locking member (4) has an installation cavity (41). The body part (31) is disposed in the installation cavity (41), and the accommodating space (6) is formed between the body part (31) and the cavity wall of the installation cavity (41).

3. The seat belt pretensioning device (10) according to claim 2, characterized in that, The main body (31) is provided with at least one drive groove, each drive groove including a locking surface (311) and a limiting surface (312), the locking surface (311) and the limiting surface (312) are connected, the accommodating space (6) is formed between the locking surface (311), the limiting surface (312) and the cavity wall of the mounting cavity (41), when the scroll (2) rotates in the second direction, the locking element (5) abuts against the locking surface (311) and the cavity wall of the mounting cavity (41).

4. The seat belt pretensioning device (10) according to claim 3, characterized in that, The cavity wall of the mounting cavity (41) includes an annular cavity wall (411) which surrounds the circumferential outer side of the body part (31). The annular cavity wall (411) is disposed opposite to the locking surface (311). The distance between the locking surface (311) and the annular cavity wall (411) gradually decreases in the direction from one end of the locking surface (311) near the limiting surface (312) to the other end away from the limiting surface (312).

5. The seat belt pretensioning device (10) according to claim 4, characterized in that, In any cross section perpendicular to the axial direction of the spool (2), the locking element (5) is circular. Within the same cross section, the minimum distance between the locking surface (311) and the annular cavity wall (411) is less than the diameter of the circle, and the maximum distance between the locking surface (311) and the annular cavity wall (411) is greater than the diameter of the circle.

6. The seat belt pretensioning device (10) according to claim 3, characterized in that, The locking surface (311) is a plane, and the locking surface (311) is parallel to the rotation axis of the scroll (2). The shortest line connecting any point on the locking surface (311) and the rotation axis of the scroll (2) has an angle α between it and the normal of the locking surface (311) at that point, satisfying 90°<α<180°.

7. The seat belt pretensioning device (10) according to claim 3, characterized in that, There are multiple drive slots, which are spaced apart in the circumferential direction of the first locking member (3).

8. The seat belt pretensioning device (10) according to claim 4, characterized in that, The first locking member (3) further includes a first shaft portion (32), which is connected to one end of the body portion (31). The second locking member (4) is provided with a first shaft hole (42) that communicates with the mounting cavity (41). The inner diameter of the annular cavity wall (411) is larger than the diameter of the first shaft hole (42). The first shaft portion (32) passes through the first shaft hole (42). When the scroll (2) rotates along the first direction, the distance between the first shaft portion (32) and the first shaft hole (42) is less than the minimum distance between the locking element (5) and the second locking member (4).

9. The seat belt pretensioning device (10) according to claim 4 or 8, characterized in that, The first locking member (3) further includes a second shaft portion (33), which is connected to the other end of the body portion (31). The housing (1) includes a first side plate (11), which is used to enclose the mounting cavity (41). The first side plate (11) is provided with a second shaft hole (111) that communicates with the mounting cavity (41). The inner diameter of the annular cavity wall (411) is larger than the diameter of the second shaft hole (111). The second shaft portion (33) passes through the second shaft hole (111). When the scroll (2) rotates in the first direction, the distance between the second shaft portion (33) and the second shaft hole (111) is less than the minimum distance between the locking element (5) and the second locking member (4).

10. The seat belt pretensioning device (10) according to claim 8, characterized in that, The inner diameter of the annular cavity wall (411) is greater than the maximum outer diameter of the body part (31); and / or, the radius of the first shaft hole (42) is less than the shortest distance between the locking surface (311) and the rotation axis of the scroll (2).

11. The seat belt pretensioning device (10) according to claim 1, characterized in that, The seat belt pretensioning device (10) further includes a driving device for driving the reel (2) to rotate in the first direction.

12. A seat belt assembly (20), characterized in that, Includes the seat belt pretensioner (10) according to any one of claims 1-11.

13. A seat assembly (30), characterized in that, Includes a seat belt pretensioner (10) according to any one of claims 1-11, or includes a seat belt assembly (20) according to claim 12.

14. A vehicle (100), characterized in that, It includes the seat belt pretensioner (10) according to any one of claims 1-11, or the seat belt assembly (20) according to claim 12, or the seat assembly (30) according to claim 13.

15. The vehicle (100) according to claim 14, characterized in that, The vehicle (100) also includes a seat belt connected to the reel (2), which is adapted to rotate in the first direction to wind up the seat belt when driven. The vehicle (100) also includes a seat belt retractor, and the seat belt pretensioning device (10) is connected to the same seat belt as the seat belt retractor.

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