Seat belt retractor, seat belt assembly and vehicle

Abstract

The present application relates to a seat belt retractor, a seat belt assembly and a vehicle, the seat belt retractor comprising a frame, a clamping mounting portion and a winding portion, the clamping mounting portion being mounted on a first side of the frame, the clamping mounting portion being provided with a rotating hole on a side of the frame facing the clamping mounting portion, the bottom wall of the rotating hole being at least partially provided with a first curved surface, the first curved surface being bent in a direction away from the frame, the winding portion being used for winding the seat belt, the winding portion comprising a reel and a rotating shaft provided at one end of the reel, the reel being suitable for being rotatably mounted on the frame around the axis of the rotating shaft, the end of the rotating shaft facing away from the reel being provided with a second curved surface, the second curved surface being bent in a direction away from the reel, the rotating shaft being movably mounted in the rotating hole, and the second curved surface being used to abut against the first curved surface, so that the reel is suitable for being adjusted to a point where the axis of the rotating shaft and the axis of the rotating hole are colinearly arranged, so that the rotating shaft has the function of self-positioning and alignment, thereby increasing the reliability of radial positioning of the reel portion, simplifying the operation, and reducing the operating burden of the assembler.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a seat belt retractor, a seat belt assembly and a vehicle. Background Art

[0002] In the seat belt system, the seat belt is connected to a retractor, which usually includes a housing and a belt reel, the housing is provided with a rotating hole, the belt reel is rotatably mounted on the housing through a rotating shaft, and the seat belt is wound around the belt reel, and the seat belt is retracted by driving the belt reel to rotate. However, in the related art, in order to improve the installation accuracy of the retractor, manual positioning is usually required to ensure that the axis of the rotating shaft and the axis of the rotating hole are in line, which is cumbersome and increases the operating burden of the assembler. Summary of the invention

[0003] The embodiments of the present application provide a seat belt retractor, a seat belt assembly and a vehicle, which enable the rotating shaft to have a self-positioning and alignment function, increase the reliability of the radial positioning of the belt reel, simplify the operation, and reduce the operating burden of the assembler.

[0004] In order to achieve the above object, according to a first aspect of the present application, a seat belt retractor is provided, comprising:

[0005] frame;

[0006] A pressing and mounting portion is mounted on a first side of the frame, a rotation hole is provided on a side of the pressing and mounting portion facing the frame, a bottom wall of the rotation hole is at least partially provided as a first curved surface, and the first curved surface is bent in a direction away from the frame;

[0007] A belt reel, the belt reel is used for winding the safety belt, the belt reel comprises a reel and a rotating shaft arranged at one end of the reel, the reel is suitable for being rotatably mounted on the frame around the axis of the rotating shaft, the end of the rotating shaft away from the reel is arranged as a second curved surface, and the second curved surface is curved in a direction away from the reel;

[0008] The rotating shaft is movably installed in the rotating hole, and the second curved surface is used to abut against the first curved surface, so that the reel is suitable for adjusting to the axis of the rotating shaft and the axis of the rotating hole to be colinear.

[0009] Optionally, the first curved surface includes a first spherical surface and / or,

[0010] The second curved surface includes a second spherical surface.

[0011] Optionally, the pressing mounting portion includes a pressing body and a first elastic portion, the pressing body is mounted on a first side of the frame, and the first elastic portion is elastically connected to the pressing body and the reel.

[0012] Optionally, the first elastic portion includes a plurality of elastic arms spaced apart along the circumference of the rotating hole, one end of the plurality of elastic arms is connected to the clamping body, and the other end of the plurality of elastic arms is elastically in contact with the reel.

[0013] Optionally, an annular groove is provided at one end of the reel, and the annular groove is arranged around the circumference of the rotating shaft and is coaxially arranged with the rotating shaft;

[0014] The other ends of the plurality of elastic arms are elastically in contact with the inner wall of the annular groove.

[0015] Optionally, at least a portion of the side wall of the annular groove is configured as an inclined surface, and the inclined surface is configured to be inclined toward the rotating shaft along the direction from the pressing body to the reel;

[0016] The other ends of the plurality of elastic arms are elastically in contact with the inclined surface.

[0017] Optionally, the pressing and mounting portion is rotatably mounted on the first side of the frame around the axis direction of the rotating hole;

[0018] The seat belt retractor also includes:

[0019] A pre-tightening assembly, mounted on the frame, and used to drive the pressing mounting portion to rotate;

[0020] A transmission assembly is installed on the frame, and the transmission assembly is suitable for being driven by the clamping installation part and driving the reel to rotate.

[0021] Optionally, the transmission assembly includes:

[0022] An outer gear ring connected to the reel, the outer gear ring being coaxially arranged with the rotating shaft;

[0023] A roller, movably mounted on the frame, the roller being movable between a first position and a second position, wherein the roller is meshed with the outer gear ring in the first position and the roller is disengaged with the outer gear ring in the second position;

[0024] The pressing and mounting portion is suitable for driving the roller to move from the second position to the first position, and is used to drive the roller at the first position to rotate.

[0025] Optionally, the pre-tightening assembly comprises:

[0026] a cover body, which is disposed on a first side of the frame and connected to the frame, and is used to apply pressure to the pressing and mounting portion toward the first side;

[0027] The driving part is installed on the cover body, and the driving part is used to drive the pressing and mounting part to rotate.

[0028] Optionally, the cover body includes a pressing plate arranged opposite to the first side, and the pressing plate is provided with a through hole;

[0029] The clamping mounting portion includes a mounting column and a clamping body which are sequentially connected and arranged along the axial direction of the rotating hole. The axis of the mounting column is colinear with the axis of the rotating hole. The mounting column is rotatably mounted in the through hole. The clamping body and the clamping plate are sequentially arranged along the axial direction of the rotating hole, and the clamping body abuts against the clamping plate.

[0030] Optionally, a second elastic portion is further included, wherein the second elastic portion is elastically connected to the clamping mounting portion and the first side of the frame.

[0031] Optionally, the pressing and mounting portion includes:

[0032] A bushing, wherein the bushing is provided with the rotating hole;

[0033] The gear part is sleeved on the outer side of the bushing and has an interference fit with the bushing. The gear part is rotatably mounted on the cover body and is suitable for being driven to rotate by the driving part. The gear part elastically abuts against the second elastic part.

[0034] Optionally, a third elastic portion is provided on the outer side of the bushing, and the third elastic portion is used to press tightly against the inner ring of the gear portion.

[0035] Optionally, the belt reel further comprises a driving shaft disposed at the other end of the reel, and the driving shaft is coaxially disposed with the rotating shaft;

[0036] The seat belt retractor further comprises a coil spring assembly, wherein the coil spring assembly comprises:

[0037] A seat body, mounted on a second side of the frame, wherein the second side and the first side are arranged opposite to each other along the axial direction of the rotating hole;

[0038] A core shaft is coaxially arranged with the rotating shaft and rotatably mounted on the seat body around its axis, wherein the core shaft is connected to the driving shaft so that the core shaft is suitable for being driven by the driving shaft to rotate along a first direction;

[0039] A reed is wound around the core shaft, and one end of the reed is connected to the core shaft. The reed is suitable for driving the core shaft to rotate along a second direction, which is opposite to the first direction.

[0040] Optionally, a locking portion is further included, wherein the locking portion is mounted on the seat body, and the locking portion is used to lock and fix the core shaft to the seat body.

[0041] Optionally, the seat body and the core shaft are both provided with special-shaped holes, and the two special-shaped holes are arranged in opposite positions;

[0042] The locking portion comprises a locking pin shaft, the locking pin shaft has a locking section, and the locking section is provided with a special-shaped structure adapted to the special-shaped holes, wherein the locking section is suitable for being inserted into the two special-shaped holes.

[0043] Optionally, the seat body comprises a shell and a cover body, and the shell and the cover body are buckled together along the axial direction of the rotating shaft to form a mounting cavity;

[0044] The core shaft is located in the installation cavity, and two ends of the core shaft are rotatably connected to the shell and the cover body respectively.

[0045] Optionally, one end of the core shaft is connected to the shell via a first rotating structure, the first rotating structure comprises a first columnar protrusion and a first columnar groove matched with the first columnar protrusion, one of the first columnar protrusion and the first columnar groove is arranged on the core shaft, and the other of the first columnar protrusion and the first columnar groove is arranged on the shell; and / or,

[0046] The other end of the core shaft is connected to the cover body via a second rotating structure, which includes a second columnar protrusion and a second columnar groove matched with the second columnar protrusion, one of the second columnar protrusion and the second columnar groove is arranged on the core shaft, and the other of the second columnar protrusion and the second columnar groove is arranged on the cover body.

[0047] According to a second aspect of the present application, there is provided a seat belt assembly, comprising the seat belt retractor as described above, wherein the seat belt retractor comprises:

[0048] frame;

[0049] A pressing and mounting portion is mounted on a first side of the frame, a rotation hole is provided on a side of the pressing and mounting portion facing the frame, a bottom wall of the rotation hole is at least partially provided as a first curved surface, and the first curved surface is bent in a direction away from the frame;

[0050] A belt reel, the belt reel is used for winding the safety belt, the belt reel comprises a reel and a rotating shaft arranged at one end of the reel, the reel is suitable for being rotatably mounted on the frame around the axis of the rotating shaft, the end of the rotating shaft away from the reel is arranged as a second curved surface, and the second curved surface is curved in a direction away from the reel;

[0051] The rotating shaft is movably installed in the rotating hole, and the second curved surface is used to abut against the first curved surface, so that the reel is suitable for adjusting to the axis of the rotating shaft and the axis of the rotating hole to be colinear.

[0052] According to a third aspect of the present application, a vehicle is further provided, comprising the seat belt assembly as described above, the seat belt assembly comprising the seat belt retractor as described above, the seat belt retractor comprising:

[0053] frame;

[0054] A pressing and mounting portion is mounted on a first side of the frame, a rotation hole is provided on a side of the pressing and mounting portion facing the frame, a bottom wall of the rotation hole is at least partially provided as a first curved surface, and the first curved surface is bent in a direction away from the frame;

[0055] A belt reel, the belt reel is used for winding the safety belt, the belt reel comprises a reel and a rotating shaft arranged at one end of the reel, the reel is suitable for being rotatably mounted on the frame around the axis of the rotating shaft, the end of the rotating shaft away from the reel is arranged as a second curved surface, and the second curved surface is curved in a direction away from the reel;

[0056] The rotating shaft is movably installed in the rotating hole, and the second curved surface is used to abut against the first curved surface, so that the reel is suitable for adjusting to the axis of the rotating shaft and the axis of the rotating hole to be colinear.

[0057] In the seat belt retractor of the embodiment of the present application, the rotating shaft is movably installed in the rotating hole, and the second curved surface is used to abut against the first curved surface. When the axis of the rotating shaft deviates from the axis of the rotating hole, the support force of the pressing installation part on the rotating shaft has a radial component force F2", F2" causes the rotating shaft to move toward the axis of the rotating hole, so that the rotating shaft has a self-positioning and alignment function, which increases the reliability of the radial positioning of the belt reel, simplifies the operation, and reduces the operating burden of the assembler. The self-positioning and alignment function simplifies the installation process of the belt reel without the need to accurately adjust the position of the rotating shaft. In addition, the second curved surface is used to abut against the first curved surface so that the reel is suitable for adjusting the axis of the rotating shaft and the axis of the rotating hole to be colinear, which can not only reduce the friction and wear caused by the deviation of the axis of the rotating shaft, but also reduce the vibration and noise caused by the deviation of the axis of the rotating shaft and the axis of the rotating hole, thereby improving the durability and reliability of the entire seat belt retractor. Since the rotating shaft and the rotating hole are in curved contact, this design can reduce local stress concentration and extend the service life of the seat belt retractor. At the same time, the curved surface contact can also absorb and disperse the impact force from the outside to a certain extent, further enhancing the reliability and durability of the seat belt retractor. The second curved surface of the rotating shaft abuts against the first curved surface of the rotating hole. This design can increase the contact area between the two. When the reel rotates around the rotating shaft, the cooperation between the second curved surface and the first curved surface can reduce shaking and jitter, ensuring the stability of the seat belt during winding and releasing.

[0058] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0060] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0061] Figure 1 is an exploded schematic diagram of a seat belt retractor provided in an exemplary embodiment of the present disclosure;

[0062] Figure 2 yes Figure 1 A schematic cross-sectional view of a partial structure of a seat belt retractor is shown;

[0063] Figure 3 yes Figure 2 A local enlarged schematic diagram is shown;

[0064] Figure 4 is a schematic diagram of force analysis of the rotating shaft when the axis of the rotating shaft deviates from the axis of the rotating hole in an exemplary embodiment of the present disclosure;

[0065] Figure 5 yes Figure 4 The schematic diagram of the structure of the rotating shaft after self-positioning adjustment is shown;

[0066] Figure 6 is a schematic structural diagram of a bushing provided in an exemplary embodiment of the present disclosure;

[0067] Figure 7 is a schematic structural diagram of a tape roll portion provided in an exemplary embodiment of the present disclosure;

[0068] Figure 8 is a schematic structural diagram of a gear portion provided in an exemplary embodiment of the present disclosure;

[0069] Fig. 9 is a schematic structural diagram of a coil spring assembly provided in an exemplary embodiment of the present disclosure;

[0070] Fig.10 yes Fig. 9 A schematic cross-sectional view of a coil spring assembly is shown.

[0071] Description of reference numerals:

[0072] 10. Seat belt retractor;

[0073] 1. frame, 11. first side;

[0074] 2. a pressing and mounting portion, 21. a rotating hole, 211. a first curved surface, 22. a pressing body, 23. a first elastic portion, 231. an elastic arm, 24. a mounting column, 26. a bushing, 27. a gear portion;

[0075] 3. tape reel, 31. reel, 311. annular groove, 3111. inclined surface, 312. sleeve, 313. tape reel, 32. rotating shaft, 321. second curved surface, 33. driving shaft;

[0076] 4. pre-tightening assembly, 41. cover body, 411. pressing plate, 4111. through hole;

[0077] 51, outer gear ring, 52, roller;

[0078] 6. a second elastic portion, 7. a third elastic portion;

[0079] 8. coil spring assembly, 81. seat, 811. housing, 812. cover, 82. mandrel, 83. leaf spring

[0080] 84. Installation cavity;

[0081] 9. Special-shaped holes

[0082] 101. First columnar protrusion, 102. First columnar groove, 103. Second columnar protrusion, 104. Second columnar groove, 105. Concave-convex spline, 106. Belt sense component, 107. Vehicle sense component, 108. Gear bracket. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0084] This application provides a seat belt retractor, please refer to Figures 1 to 3 , Figure 1 is an exploded schematic diagram of a seat belt retractor provided in an exemplary embodiment of the present disclosure, Figure 2 yes Figure 1 The schematic cross-sectional view of the seat belt retractor structure shown in FIG. Figure 3 yes Figure 2 The partial enlarged schematic diagram of point A is shown. The seat belt retractor 10 comprises a frame 1 , a pressing and mounting portion 2 and a belt reel portion 3 .

[0085] The pressing and mounting portion 2 is mounted on the first side 11 of the frame 1 .

[0086] It should be noted that, in one embodiment, the pressing portion may be directly connected to the frame 1. In other embodiments, the pressing and mounting portion 2 may also be mounted on the frame 1 through other structures, which are specifically limited by the present application.

[0087] A rotation hole 21 is provided on one side of the pressing and mounting portion 2 facing the frame 1 . At least a portion of a bottom wall of the rotation hole 21 is provided as a first curved surface 211 . The first curved surface 211 is curved in a direction away from the frame 1 .

[0088] It should be noted that, in one embodiment, the first curved surface 211 may be a cylindrical curved surface curved around an axis. In other embodiments, the first curved surface 211 may be a spherical curved surface curved around a center point. Specifically, the present application does not limit the specific shape of the first curved surface 211.

[0089] The belt reel 3 is used for winding the safety belt, and includes a reel 31 and a rotating shaft 32 arranged at one end of the reel 31 .

[0090] It should be noted that, in one embodiment, the rotating shaft 32 can be integrally formed with the reel 31, so that the rotating shaft 32 and the reel 31 are tightly combined, avoiding the risk of loosening or breaking that may exist in the traditional connection method, thereby significantly improving the strength and stability of the overall structure. In addition, the one-piece molding design can optimize stress distribution, reduce stress concentration, and reduce the risk of fatigue damage caused by long-term stress. In another embodiment, the rotating shaft 32 and the reel 31 can also be bonded by glue. In other embodiments, the rotating shaft 32 and the reel 31 can also be connected by screws or splines. In other embodiments, the rotating shaft 32 and the reel 31 are riveted. Specifically, the present application does not limit the connection method between the rotating shaft 32 and the reel 31.

[0091] The reel 31 is suitable for being rotatably mounted on the frame 1 around the axis of the rotating shaft 32 . One end of the rotating shaft 32 away from the reel 31 is provided as a second curved surface 321 . The second curved surface 321 is curved in a direction away from the reel 31 .

[0092] It should be noted that the second curved surface 321 may be a cylindrical curved surface curved around an axis. In other embodiments, the second curved surface 321 may be a spherical surface curved around a center point. Specifically, the present application does not limit the specific shape of the second curved surface 321.

[0093] In the seat belt retractor 10 of the present embodiment, the rotating shaft 32 is movably mounted in the rotating hole 21, and the second curved surface 321 is used to abut against the first curved surface 211. When the axis of the rotating shaft 32 deviates from the axis of the rotating hole 21, the support force of the pressing mounting portion 2 on the rotating shaft 32 has a radial component force F2 (refer to Figure 4 and Figure 5), F2" moves the rotating shaft 32 toward the axial direction of the rotating hole 21, so that the rotating shaft 32 has the function of self-positioning and alignment, which increases the reliability of the radial positioning of the tape winding part 3, simplifies the operation, and reduces the operating burden of the assembler. The self-positioning and alignment function makes it unnecessary to accurately adjust the position of the rotating shaft 32, thereby simplifying the installation process of the tape winding part 3. In addition, the second curved surface 321 is used to abut against the first curved surface 211 so that the reel 31 is suitable for adjusting the axis of the rotating shaft 32 to be colinear with the axis of the rotating hole 21. The arrangement can not only reduce the friction and wear caused by the deviation of the axis of the rotating shaft 32, but also reduce the vibration and noise caused by the deviation of the axis of the rotating shaft 32 from the axis of the rotating hole 21, thereby improving the overall Durability and reliability of the seat belt retractor 10. Since the rotating shaft 32 and the rotating hole 21 are in curved contact, this design reduces local stress concentration and prolongs the service life of the seat belt retractor 10. At the same time, the curved contact can also absorb and disperse the impact force from the outside to a certain extent, further enhancing the reliability and durability of the seat belt retractor 10. The second curved surface 321 of the rotating shaft 32 abuts against the first curved surface 211 of the rotating hole 21. This design can increase the contact area between the two. When the reel 31 rotates around the rotating shaft 32, the cooperation between the second curved surface 321 and the first curved surface 211 can reduce shaking and jitter, ensuring the stability of the seat belt during winding and releasing.

[0094] It should be noted that the support force of the clamping mounting portion 2 on the rotating shaft 32 also has an axial component F2', which is of the same magnitude and opposite direction to the other force F1, so that the winding portion 3 is in a force balance state along the axial direction of the rotating hole 21, thereby preventing the winding portion 3 from axially moving in the rotating hole 21.

[0095] In addition, in order to reduce friction and ensure smooth rotation of the rotating shaft 32, oil lubricating grease is arranged in the rotating hole 21. Due to the existence of the first curved surface 211 and the second curved surface 321, the lubricating grease is evenly distributed, avoiding the waste caused by the accumulation of grease in the corners and the wear of the sharp corners affecting the performance of the seat belt retractor.

[0096] Reference Figure 1 and Figure 4 In some embodiments, the first curved surface 211 includes a first spherical surface. In this way, the first spherical surface design can reduce the direct contact area between the rotating shaft 32 and the rotating hole 21, thereby reducing friction and wear. This friction reduction effect helps to extend the service life of the clamping mounting portion 2 and the tape roll portion 3, and reduce the noise and vibration caused by friction. When the axis of the rotating shaft 32 deviates from the axis of the rotating hole 21, the cooperation of the first spherical surface and the second curved surface 321 can produce an automatic adjustment mechanism. This mechanism enables the rotating shaft 32 to automatically move toward the axis of the rotating hole 21, thereby achieving self-positioning alignment.

[0097] Reference Figure 1 and Figure 5 In some embodiments, the second curved surface 321 includes a second spherical surface. In this way, the second spherical surface design can reduce the direct contact area between the rotating shaft 32 and the rotating hole 21, thereby reducing friction and wear. This friction reduction effect helps to extend the service life of the clamping mounting portion 2 and the tape roll portion 3, and reduce the noise and vibration caused by friction. When the axis of the rotating shaft 32 deviates from the axis of the rotating hole 21, the cooperation of the second spherical surface and the first curved surface 211 can produce an automatic adjustment mechanism. This mechanism enables the rotating shaft 32 to automatically move toward the axis of the rotating hole 21, thereby achieving self-positioning alignment.

[0098] Reference Figure 3 and Figure 6 , Figure 6 It is a structural schematic diagram of the bushing provided in an exemplary embodiment of the present disclosure. In some embodiments, the clamping mounting portion 2 includes a clamping body 22 and a first elastic portion 23. The clamping body 22 is installed on the first side 11 of the frame 1. The first elastic portion 23 is elastically connected to the clamping body 22 and the reel 31. In this way, since the first elastic portion 23 has a certain elastic deformation ability, the first elastic portion 23 can absorb part of the impact force and maintain a stable contact between the clamping body 22 and the reel 31, thereby ensuring that the clamping effect is continuous and effective.

[0099] Reference Figure 6 In some embodiments, the first elastic portion 23 includes a plurality of elastic arms 231 arranged at intervals along the circumference of the rotating hole 21, one end of the plurality of elastic arms 231 is connected to the clamping body 22, and the other end of the plurality of elastic arms 231 elastically abuts against the reel 31. In this way, the plurality of elastic arms 231 are arranged at intervals along the circumference of the rotating hole 21, which can ensure that the clamping force is evenly distributed in the circumference of the reel 31, improve the uniformity of the clamping effect, and make the reel 31 always in the axial direction of the rotating hole 21 in a squeezed state, thereby preventing the reel 31 from shaking and making abnormal noises in the axial direction of the rotating hole 21. Since the elastic arms 231 are elastically abutted against the reel 31, the manufacturing error of the reel 31 in the axial direction of the rotating hole 21 can be absorbed, and the control requirements of the axial size of the reel 31 in the rotating hole 21 are reduced, thereby reducing the manufacturing requirements of the components related to the axial positioning of the reel 31 and saving costs. The elastic contact between the elastic arm 231 and the reel 31 can absorb and alleviate the impact and vibration caused by tightening or releasing the seat belt to a certain extent, ensuring that the seat belt can be tightened quickly and effectively in an emergency.

[0100] Reference Figure 3 and Figure 7 , Figure 7: is a schematic diagram of the structure of the tape reel provided in an exemplary embodiment of the present disclosure. In one embodiment, an annular groove 311 is provided at one end of the reel 31. The annular groove 311 is arranged around the circumference of the rotating shaft 32 and is coaxially arranged with the rotating shaft 32. The other ends of the multiple elastic arms 231 are elastically abutted against the inner wall of the annular groove 311. In this way, it is ensured that the pressing force applied by the multiple elastic arms 231 is evenly distributed in the circumferential direction of the reel 31, so that the reel 31 is always in a squeezed state in the axial direction of the rotating hole 21, and the reel 31 is prevented from shaking and making abnormal noises in the axial direction of the rotating hole 21. The design of the annular groove 311 provides a clear positioning point for the elastic arm 231. Since the annular groove 311 is coaxially arranged with the rotating shaft 32 and distributed around the circumference of the rotating shaft 32, the elastic arm 231 can be accurately placed at the specified position of the annular groove 311. This design ensures that the elastic arm 231 is quickly and stably installed on the reel 31. The inner wall of the annular groove 311 elastically abuts against the end of the elastic arm 231. This design helps to keep the elastic arm 231 stable on the reel 31. Even if the reel 31 generates a certain vibration or impact during rotation, the annular groove 311 can effectively prevent the elastic arm 231 from excessive displacement or falling off. The existence of the annular groove 311 provides a clear limit range for the deformation of the elastic arm 231. When the elastic arm 231 is subjected to external force, its deformation degree will be constrained by the inner wall of the annular groove 311. In this way, it can prevent the elastic arm 231 from losing its original elasticity or causing functional failure due to excessive deformation.

[0101] Reference Figure 3 In some embodiments, at least part of the side wall of the annular groove 311 is set as an inclined surface 3111, and the inclined surface 3111 is inclined toward the rotating shaft 32 along the direction from the pressing body 22 to the reel 31. The other ends of the multiple elastic arms 231 are elastically abutted against the inclined surface 3111. The design of the inclined surface 3111 makes the elastic arms 231 more uniformly stressed when in contact with the annular groove 311. Compared with planar contact, the inclined surface 3111 can better disperse stress, thereby avoiding damage or excessive deformation of the elastic arm 231 caused by local stress concentration. When the elastic arm 231 abuts against the inclined surface 3111, the force applied by the elastic arm 231 to the reel 31 has a first component along the axial direction of the rotating hole 21 and a second component along the radial direction of the rotating hole 21. The first component can compress the reel 31 to prevent the reel 31 from shaking along the axial direction of the rotating hole 21. The second force component can also enable the reel 31 to have self-positioning ability along the radial direction of the rotating hole 21, so that the axis of the rotating shaft and the axis of the rotating hole are arranged in a colinear manner. In addition, the second force component generates a certain restraining force, which helps to prevent the reel 31 from excessively deflecting or shaking along the radial direction of the rotating hole 21 during rotation, thereby improving the overall stability and reliability of the retractor.

[0102] Reference Figure 7 The reel 31 includes a sleeve 312 and a tape reel 313, which are meshed and riveted together through a concave-convex spline 105, and the rotating shaft 32 is arranged on the sleeve 312. In this way, the number of parts is reduced, the positioning accuracy is improved, and the reel 31 has a simple structure, light weight, low cost, and is easy to process, thereby reducing the manufacturing cost.

[0103] Reference Figures 1 to 3 In some embodiments, the clamping installation part 2 is rotatably installed on the first side 11 of the frame 1 around the axis of the rotating hole 21. The seat belt retractor 10 also includes a pre-tensioning assembly 4 and a transmission assembly. The pre-tensioning assembly 4 is installed on the frame 1. The pre-tensioning assembly 4 is used to drive the clamping installation part 2 to rotate. The transmission assembly is installed on the frame 1. The transmission assembly is suitable for being driven by the clamping installation part 2 and driving the reel 31 to rotate. In this way, the clamping installation part 2 is rotatably installed around the axis of the rotating hole 21, making the structure of the entire seat belt retractor 10 more compact. The coordinated work of the pre-tensioning assembly 4 and the transmission assembly ensures that the clamping installation part 2 can efficiently drive the reel 31 to rotate, reducing energy loss and transmission delay, so that the seat belt retractor 10 can respond faster and tighten the seat belt in an emergency.

[0104] It should be noted that when the vehicle collides or brakes suddenly, the pre-tensioning assembly 4 will start quickly and drive the pressing mounting portion 2 to rotate. Subsequently, the transmission assembly converts this rotation into the rotation of the reel 31, thereby quickly tightening the seat belt and securing the passenger. This rapid response capability helps reduce the risk of injury to passengers in a collision.

[0105] Reference Figure 7In some embodiments, the transmission assembly includes an outer gear ring 51 and a roller 52, the outer gear ring 51 is connected to the reel 31, the outer gear ring 51 is coaxially arranged with the rotating shaft 32, the roller 52 is movably mounted on the frame 1, and the roller 52 can move between a first position and a second position. In the first position, the roller 52 is meshed with the outer gear ring 51, and in the second position, the roller 52 is disengaged from the outer gear ring 51. The pressing mounting portion 2 is suitable for driving the roller 52 to move from the second position to the first position, and is used to drive the roller 52 in the first position to rotate. In this way, since the outer gear ring 51 is connected to the reel 31 and is coaxially arranged with the rotating shaft 32, the directness and efficiency of the transmission are ensured. When the roller 52 is meshed with the outer gear ring 51, the rotation of the roller 52 can directly drive the outer gear ring 51 and the reel 31 to rotate, reducing energy loss and transmission delay, and helping to quickly respond and tighten the seat belt in an emergency. The roller 52 can move between a first position and a second position. This design enables the transmission component to accurately start or stop transmission when needed, so that the transmission component can adjust the working state according to actual needs. For example, it can maintain a non-transmission state when the vehicle is driving normally to reduce unnecessary energy consumption and wear; in an emergency, it can quickly switch to a transmission state to tighten the seat belt.

[0106] It should be noted that the technology for enabling the roller 52 to move between the first position and the yielding position is already mature, and this application will not elaborate on this.

[0107] Reference Figure 2 and Figure 3 In one embodiment, the pretensioning assembly 4 includes a cover 41 and a driving unit. The cover 41 is disposed on the first side 11 of the frame 1 and is connected to the frame 1. The cover 41 is used to apply pressure toward the first side 11 to the pressing mounting portion 2. This pressure helps to maintain the stability and position accuracy of the pressing mounting portion 2 and prevents it from being offset or loosened during operation. The driving unit is installed on the cover 41. The driving unit is used to drive the pressing mounting portion 2 to rotate, ensuring that the pressing mounting portion 2 can rotate in a predetermined manner and angle, thereby improving the stability and reliability of the seat belt retractor 10, ensuring that the seat belt is quickly tightened and the passenger is fixed in an emergency, thereby improving the overall safety.

[0108] Reference Figure 2 and Figure 3In some embodiments, the cover body 41 includes a clamping plate 411 disposed opposite to the first side 11, the clamping plate 411 is provided with a through hole 4111, the clamping mounting portion 2 includes a mounting column 24 and a clamping body 22 sequentially connected and arranged along the axial direction of the rotating hole 21, the axis of the mounting column 24 is colinearly arranged with the axis of the rotating hole 21, and the mounting column 24 is rotatably mounted in the through hole 4111, so that the clamping plate 411 and the clamping mounting portion 2 are rotatably connected through the through hole 4111 and the mounting column 24, the structure is simple, and the precise alignment of the clamping mounting portion 2 during the installation process is ensured, which helps to reduce assembly errors. The clamping body 22 and the clamping plate 411 are sequentially arranged along the axial direction of the rotating hole 21, and the clamping body 22 abuts against the clamping plate 411, so that the clamping mounting portion 2 can maintain a certain stability during the rotation process to avoid shaking.

[0109] Reference Figures 1 to 3 In some embodiments, the seat belt retractor 10 further includes a second elastic portion 6, which is elastically connected to the pressing mounting portion 2 and the first side 11 of the frame 1. In this way, the second elastic portion 6, as an elastic connector, can provide a certain buffering and shock absorbing effect between the pressing mounting portion 2 and the frame 1 in emergency situations such as vehicle collision or sudden braking. Through the elastic connection, the second elastic portion 6 can enhance the structural stability between the pressing mounting portion 2 and the frame 1, prevent the pressing mounting portion 2 from unnecessary movement or shaking, and thus ensure the normal operation of the seat belt system.

[0110] It should be noted that when the seat belt is in normal working condition (no pre-tightening occurs), the clamping mounting part 2 cannot rotate or move axially. The second elastic part 6 is provided so that the clamping mounting part 2 is subjected to the axial pressure of the pre-tightening component 4 along the rotating hole 21, so that the clamping mounting part 2 is clamped between the first side and the clamping plate 411, and the clamping mounting part 2 is subjected to a large friction force, thereby preventing the clamping mounting part 2 from rotating or moving axially when no driving force is applied. When the vehicle collides, the seat belt needs to be pre-tightened, and the driving part drives the clamping mounting part 2 to rotate, and the clamping mounting part 2 makes the roller 52 mesh with the outer gear ring 51. In this way, the rotation of the roller 52 can directly drive the outer gear ring 51 and the reel 31 to rotate, so as to achieve rapid response and tightening of the seat belt in an emergency.

[0111] Reference Figure 1 , Figure 2 , Figure 4 and Figure 8 , Figure 82 is a schematic diagram of the structure of the gear part provided in the exemplary embodiment of the present disclosure. In some embodiments, the pressing and mounting part 2 includes a bushing 26 and a gear part 27. The bushing 26 is provided with a rotation hole 21, so that the reel 31 is rotatably connected to the bushing 26. The gear part 27 is sleeved on the outside of the bushing 26 and has an interference fit with the bushing 26, so that the connection between the bushing 26 and the gear part 27 is stable, and the bushing 26 is prevented from shaking relative to the gear part 27. The gear part 27 is rotatably mounted on the cover body 41 and is suitable for being driven to rotate by the driving part. The gear part 27 elastically abuts against the second elastic part 6, so that the gear part 27 is sandwiched between the cover body 41 and the second elastic part 6. When the gear part 27 is sandwiched between the cover body 41 and the second elastic part 6, the two ends of the gear part 27 along the axial direction of the rotation hole 21 are respectively abutted against the cover body 41 and the second elastic part 6, so that the gear part 27 is prevented from moving along the axial direction of the rotation hole 21. In addition, when the two ends of the gear part 27 along the axial direction of the rotating hole 21 are respectively pressed against the cover body 41 and the second elastic part 6, there will be a large friction force between the gear part 27 and the cover body 41 and the second elastic part 6. The large friction force will prevent the gear part 27 from rotating when no driving force is applied.

[0112] There are many ways to achieve interference fit between the gear part 27 and the bushing 26. For example, in one embodiment, a third elastic part 7 is provided on the outer side of the bushing 26, and the third elastic part 7 is used to press against the inner ring of the gear part 27. In this way, there is a large friction between the third elastic part 7 and the gear part 27, so that the gear part 27 and the bushing 26 can rotate synchronously, and the structure is simple. Through the pressing effect of the third elastic part 7, the connection between the bushing 26 and the gear part 27 can be made more rigid, which helps to improve the stability and accuracy of the transmission. In addition, the provision of the third elastic part 7 relaxes the tolerance band requirements of the inner ring of the gear part, reduces the manufacturing difficulty and saves production costs. The bushing 26 is fitted with the gear part 27 in the radial direction through the third elastic part 7. In this way, the shaking and abnormal sound of the bushing 26 relative to the gear part 27 in the radial direction of the rotating hole 21 are effectively reduced and avoided, and the stability of the bushing 26 is improved.

[0113] Of course, in another embodiment, a third elastic portion 7 may be provided on the inner ring of the gear portion 27 to achieve interference fit between the gear portion 27 and the bushing 26. In another embodiment, a third elastic portion 7 may be provided on the inner ring of the gear portion 27 and a third elastic portion 7 may be provided on the outer side of the bushing 26 to achieve interference fit between the gear portion 27 and the bushing 26. Specifically, the present application does not limit the specific manner of interference fit between the gear portion 27 and the outer side of the bushing 26. In addition, the gear portion 27 is mounted on the first side 11 of the frame 1 through the gear bracket 108.

[0114] Reference Figure 1 and Figure 7In one embodiment, the tape winding portion 3 also includes a driving shaft 33 disposed at the other end of the drum 31, the driving shaft 33 is coaxially arranged with the rotating shaft 32, the seat belt retractor 10 also includes a winding spring assembly 8, the winding spring assembly 8 includes a seat body 81, a core shaft 82 and a spring leaf 83, the seat body 81 is installed on the second side of the frame 1, the second side and the first side 11 are arranged in opposite directions along the axial direction of the rotating hole 21, the core shaft 82 is coaxially arranged with the rotating shaft 32 and is rotatably installed on the seat body 81 around its axis, the core shaft 82 is connected to the driving shaft 33, so that the core shaft 82 is suitable for being driven by the driving shaft 33 to rotate in the first direction, this design enables the driving shaft 33 to efficiently transmit power to the core shaft 82, thereby driving the drum 31 to perform tape winding or unwinding operations. The reed 83 is wound around the core shaft 82, and one end of the reed 83 is connected to the core shaft 82. The reed 83 is suitable for driving the core shaft 82 to rotate in a second direction, which is opposite to the first direction. In this way, when the seat belt is pulled out, the reed 83 will be stretched and store energy, so that the seat belt can automatically rewind when not affected by external force, thereby ensuring the safety of passengers.

[0115] In one embodiment, the seat belt retractor 10 also includes a locking portion, which is installed on the seat body 81. The locking portion is used to lock and fix the core shaft 82 to the seat body 81. In this way, it can be ensured that the coil spring assembly 8 maintains a certain tension, so that the seat belt can automatically rewind to the initial position when not affected by external force.

[0116] Reference Fig. 9 and Fig.10 , Fig. 9 is a schematic structural diagram of a coil spring assembly provided in an exemplary embodiment of the present disclosure, Fig.10 yes Fig. 9 The cross-sectional schematic diagram of the coil spring assembly shown in the figure shows that in one embodiment, the seat body 81 and the core shaft 82 are both provided with a special-shaped hole 9, the two special-shaped holes 9 are arranged in a counter-positioned manner, and the locking portion includes a locking pin shaft, the locking pin shaft has a locking section, and the locking section is provided with a special-shaped structure adapted to the special-shaped hole 9, wherein the locking section is suitable for being inserted into the two special-shaped holes 9, so that the core shaft 82 is locked and fixed to the seat body 81, thereby achieving the effect of pre-tightening and locking the coil spring assembly 8. In addition, the special-shaped structural design of the special-shaped hole 9 and the locking pin shaft can reduce the relative movement between the two, thereby reducing the wear rate and extending the service life of the locking portion.

[0117] It should be noted that the shapes of the special-shaped holes 9 are various, for example, the special-shaped holes 9 can be elliptical holes, rectangular holes, polygonal holes or irregular holes. In the embodiment of the present application, the special-shaped holes 9 are centrally symmetrical structures. Of course, the specific shape of the special-shaped holes 9 can be set as needed, and the present application does not limit this.

[0118] Reference Fig.10In one embodiment, the seat body 81 includes a shell 811 and a cover 812, and the shell 811 and the cover 812 are engaged with each other along the axial direction of the rotating shaft 32 to form a mounting cavity 84, so that the ability of the seat body 81 to resist deformation and impact is enhanced. The core shaft 82 is in the mounting cavity 84, and the two ends of the core shaft 82 are rotatably connected to the shell 811 and the cover 812, so that the core shaft 82 is not easily affected by external interference, and the service life of the core shaft 82 is improved. The two ends of the core shaft 82 are rotatably connected to the shell 811 and the cover 812, respectively. This design ensures that the core shaft 82 can rotate stably in the mounting cavity 84, and ensures that the core shaft 82 can quickly respond to the passenger's pulling and releasing operations on the seat belt.

[0119] Reference Fig.10 In one embodiment, one end of the mandrel 82 is connected to the housing 811 through a first rotating structure, and the first rotating structure includes a first columnar protrusion 101 and a first columnar groove 102 adapted to the first columnar protrusion 101. One of the first columnar protrusion 101 and the first columnar groove 102 is provided on the mandrel 82, and the other of the first columnar protrusion 101 and the first columnar groove 102 is provided on the housing 811. In this way, the adaptation design of the first columnar protrusion 101 and the first columnar groove 102 enables the mandrel 82 to rotate smoothly in the housing 811. Due to the close fit between the first columnar protrusion 101 and the first columnar groove 102, the mandrel 82 is not easy to shake or deviate during the rotation process, thereby improving the stability of the rotation. The design of the first rotating structure makes the installation process of the mandrel 82 and the housing 811 easier. The connection between the two can be achieved by simply inserting the first columnar protrusion 101 into the first columnar groove 102. This design reduces the difficulty and cost of installation and improves production efficiency. The tight fit between the first cylindrical protrusion 101 and the first cylindrical groove 102 ensures a firm connection between the mandrel 82 and the housing 811, so that the mandrel 82 is not easy to loosen or fall off relative to the housing 811, thereby improving the overall reliability and safety of the seat belt retractor 10. The design of the first rotating structure makes the connection between the mandrel 82 and the housing 811 easy to disassemble. When maintenance or replacement of parts is required, the mandrel 82 can be easily removed for inspection and replacement.

[0120] Continue to refer to Fig.10In some embodiments, the other end of the mandrel 82 is connected to the cover 812 through a second rotating structure, and the second rotating structure includes a second columnar protrusion 103 and a second columnar groove 104 adapted to the second columnar protrusion 103. One of the second columnar protrusion 103 and the second columnar groove 104 is provided on the mandrel 82, and the other of the second columnar protrusion 103 and the second columnar groove 104 is provided on the cover 812. In this way, the design of the second rotating structure enables the mandrel 82 to rotate smoothly in the cover 812. The close fit between the second columnar protrusion 103 and the second columnar groove 104 helps to reduce the shaking or deviation of the mandrel 82 during the rotation process, thereby improving the stability of the rotation. The design of the second rotating structure simplifies the installation process between the mandrel 82 and the cover 812. The connection between the two can be achieved by simply inserting the second columnar protrusion 103 into the second columnar groove 104. This design reduces the difficulty and cost of installation and improves production efficiency. The tight fit between the second columnar protrusion 103 and the second columnar groove 104 ensures a firm connection between the mandrel 82 and the cover 812, so that the mandrel 82 is not easy to loosen or fall off relative to the cover 812, thereby improving the overall reliability and safety of the seat belt retractor 10. The design of the second rotating structure makes the connection between the mandrel 82 and the cover 812 easy to disassemble. When maintenance or replacement of parts is required, the mandrel 82 can be easily removed for inspection and replacement.

[0121] It should be noted that the arrangement of the first columnar protrusion 101 inserted into the first columnar groove 102 and the arrangement of the second columnar protrusion 103 inserted into the second columnar groove 104 can also effectively isolate the internal and external spaces of the seat body 81 to prevent foreign matter from entering the installation cavity 84 or internal grease from flowing out of the installation cavity 84.

[0122] Reference Figure 1 In some embodiments, the seat belt retractor 10 further includes a belt sensing component 106 and a vehicle sensing component 107. The belt sensing component 106 and the vehicle sensing component 107 realize the locking function of the seat belt retractor 10 during normal use, such as locking the seat belt when braking suddenly or the vehicle body tilts too much.

[0123] According to a second aspect of the present disclosure, a seat belt assembly is provided, the seat belt assembly comprising the above-mentioned seat belt retractor 10. The seat belt assembly has all the beneficial effects of the above-mentioned seat belt retractor 10, which will not be described in detail in the present disclosure.

[0124] According to a third aspect of the present disclosure, a vehicle is provided, the vehicle comprising the above-mentioned seat belt assembly, the vehicle having all the beneficial effects of the above-mentioned seat belt assembly, which will not be described in detail in the present disclosure.

[0125] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and the present disclosure does not make any specific limitation on this.

[0126] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0127] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0128] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0129] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A seat belt retractor, characterized in that: include: frame; A pressing and mounting portion is mounted on a first side of the frame, a rotation hole is provided on a side of the pressing and mounting portion facing the frame, a bottom wall of the rotation hole is at least partially provided as a first curved surface, and the first curved surface is bent in a direction away from the frame; A belt reel, the belt reel is used for winding the safety belt, the belt reel comprises a reel and a rotating shaft arranged at one end of the reel, the reel is suitable for being rotatably mounted on the frame around the axis of the rotating shaft, the end of the rotating shaft away from the reel is arranged as a second curved surface, and the second curved surface is curved in a direction away from the reel; The rotating shaft is movably installed in the rotating hole, and the second curved surface is used to abut against the first curved surface, so that the reel is suitable for adjusting to the axis of the rotating shaft and the axis of the rotating hole to be arranged in a colinear manner; Wherein, the pressing and mounting part comprises a pressing body and a first elastic part, the pressing body is mounted on a first side of the frame, and the first elastic part is elastically connected to the pressing body and the reel; The first elastic part comprises a plurality of elastic arms arranged at intervals along the circumference of the rotating hole, one end of the plurality of elastic arms is connected to the pressing body, and the other end of the plurality of elastic arms is elastically abutted against the reel; An annular groove is provided at one end of the reel, and the annular groove is arranged around the circumference of the rotating shaft and is coaxially arranged with the rotating shaft; The other ends of the plurality of elastic arms are elastically abutted against the inner wall of the annular groove; At least part of the side wall of the annular groove is configured as an inclined surface, and the inclined surface is configured to be inclined toward the rotating shaft along the direction from the pressing body to the reel; The other ends of the plurality of elastic arms are elastically in contact with the inclined surface.

2. The seat belt retractor according to claim 1, characterized in that: The first curved surface includes a first spherical surface and / or, The second curved surface includes a second spherical surface.

3. The seat belt retractor according to claim 1 or 2, characterized in that: The pressing and mounting portion is rotatably mounted on the first side of the frame around the axis direction of the rotating hole; The seat belt retractor also includes: A pre-tightening assembly, mounted on the frame, and used to drive the pressing mounting portion to rotate; A transmission assembly is installed on the frame, and the transmission assembly is suitable for being driven by the clamping installation part and driving the reel to rotate.

4. The seat belt retractor according to claim 3, characterized in that: The transmission assembly comprises: An outer gear ring connected to the reel, the outer gear ring being coaxially arranged with the rotating shaft; A roller, movably mounted on the frame, the roller being movable between a first position and a second position, wherein the roller is meshed with the outer gear ring in the first position and the roller is disengaged with the outer gear ring in the second position; The pressing and mounting portion is suitable for driving the roller to move from the second position to the first position, and is used to drive the roller at the first position to rotate.

5. The seat belt retractor according to claim 3, characterized in that: The preload assembly comprises: a cover body, which is disposed on a first side of the frame and connected to the frame, and is used to apply pressure to the pressing and mounting portion toward the first side; The driving part is installed on the cover body, and the driving part is used to drive the pressing and mounting part to rotate.

6. The seat belt retractor according to claim 5, characterized in that: The cover body comprises a pressing plate arranged opposite to the first side, and the pressing plate is provided with a through hole; The clamping mounting portion includes a mounting column and a clamping body which are sequentially connected and arranged along the axial direction of the rotating hole. The axis of the mounting column is colinear with the axis of the rotating hole. The mounting column is rotatably mounted in the through hole. The clamping body and the clamping plate are sequentially arranged along the axial direction of the rotating hole, and the clamping body abuts against the clamping plate.

7. The seat belt retractor according to claim 5, characterized in that: A second elastic portion is also included, wherein the second elastic portion is elastically connected to the pressing mounting portion and the first side of the frame.

8. The seat belt retractor according to claim 7, characterized in that: The pressing and mounting portion comprises: A bushing, wherein the bushing is provided with the rotating hole; The gear part is sleeved on the outer side of the bushing and has an interference fit with the bushing. The gear part is rotatably mounted on the cover body and is suitable for being driven to rotate by the driving part. The gear part elastically abuts against the second elastic part.

9. The seat belt retractor according to claim 8, characterized in that: A third elastic portion is disposed on the outer side of the bushing, and the third elastic portion is used to tightly abut against the inner ring of the gear portion.

10. The seat belt retractor according to claim 1 or 2, characterized in that: The belt reel further comprises a drive shaft disposed at the other end of the reel, wherein the drive shaft is coaxially disposed with the rotating shaft; The seat belt retractor further comprises a coil spring assembly, wherein the coil spring assembly comprises: A seat body, mounted on a second side of the frame, wherein the second side and the first side are arranged opposite to each other along the axial direction of the rotating hole; A core shaft is coaxially arranged with the rotating shaft and rotatably mounted on the seat body around its axis, wherein the core shaft is connected to the driving shaft so that the core shaft is suitable for being driven by the driving shaft to rotate along a first direction; A reed is wound around the core shaft, and one end of the reed is connected to the core shaft. The reed is suitable for driving the core shaft to rotate along a second direction, which is opposite to the first direction.

11. The seat belt retractor according to claim 10, characterized in that: It also includes a locking portion, which is installed on the seat body and is used to lock and fix the core shaft to the seat body.

12. The seat belt retractor according to claim 11, characterized in that: The seat body and the core shaft are both provided with special-shaped holes, and the two special-shaped holes are arranged in opposite positions; The locking portion comprises a locking pin shaft, the locking pin shaft has a locking section, and the locking section is provided with a special-shaped structure adapted to the special-shaped holes, wherein the locking section is suitable for being inserted into the two special-shaped holes.

13. The seat belt retractor according to claim 10, characterized in that: The seat body comprises a shell and a cover, wherein the shell and the cover are buckled together along the axial direction of the rotating shaft to form a mounting cavity; The core shaft is located in the installation cavity, and two ends of the core shaft are rotatably connected to the shell and the cover body respectively.

14. The seat belt retractor according to claim 13, characterized in that: One end of the core shaft is connected to the shell through a first rotating structure, the first rotating structure includes a first columnar protrusion and a first columnar groove matched with the first columnar protrusion, one of the first columnar protrusion and the first columnar groove is arranged on the core shaft, and the other of the first columnar protrusion and the first columnar groove is arranged on the shell; and / or, The other end of the core shaft is connected to the cover body via a second rotating structure, which includes a second columnar protrusion and a second columnar groove matched with the second columnar protrusion, one of the second columnar protrusion and the second columnar groove is arranged on the core shaft, and the other of the second columnar protrusion and the second columnar groove is arranged on the cover body.

15. A seat belt assembly, characterized in that: It comprises the seat belt retractor according to any one of claims 1 to 14.

16. A vehicle, characterized in that: Comprising the seat belt assembly as claimed in claim 15.

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