Safety belt retractor, safety belt assembly and vehicle

Abstract

The utility model provides a safety belt retractor, a safety belt assembly and a vehicle. The safety belt retractor comprises a brake shaft, a force limiting component and a shaft sleeve, the force limiting component and the brake shaft are arranged in the axial direction of the brake shaft, the shaft sleeve sleeves the end, close to the force limiting component, of the brake shaft, and the shaft sleeve can be in transmission connection with the brake shaft. The shaft sleeve sleeves the end, close to the brake shaft, of the force limiting component and can be in transmission connection with the force limiting component. The force limiting component and the brake shaft do not have an overlapped part or even have a gap in the axial direction of the brake shaft, so that the lengths of the force limiting component and the brake shaft can be shortened; force transmission is achieved through the shaft sleeve, the requirement for machining precision is lowered, and the relative position between the force limiting component and the brake shaft is more flexible; and assembly is facilitated, meanwhile, the precision requirement for the brake shaft and the force limiting component is lowered, and the manufacturing difficulty and cost are remarkably reduced.

Description

Technical Field

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

[0002] The seat belt retractor includes a two-section belt shaft consisting of a core shaft and a brake shaft, and a force-limiting member connected between the core shaft and the brake shaft. The webbing for restraining the occupant is fixed on the core shaft. When the seat belt retractor is locked by a locking device and is in a locked state, the webbing can drive the core shaft to rotate under a force exceeding the limit of the force-limiting member, so that the webbing is pulled out a certain distance. At present, the core shaft and the brake shaft of the two-section belt shaft usually have one end overlapping in the axial direction of the core shaft, and the force-limiting member needs to be fixedly connected to the core shaft to transmit torque, which makes the axial dimensions of the brake shaft and the force-limiting member large. In order to ensure the assembly effect, the precision requirements for the brake shaft and the force-limiting mechanism are high, resulting in great production difficulty and high cost. Utility Model Content

[0003] The present application provides a seat belt retractor, a seat belt assembly and a vehicle that are conducive to reducing the difficulty of processing a brake shaft and a limiting component.

[0004] In a first aspect, an embodiment of the present application provides a seat belt retractor, which includes a brake shaft, a force limiting member and a shaft sleeve, wherein the force limiting member and the brake shaft are arranged along the axial direction of the brake shaft, the shaft sleeve is sleeved outside one end of the brake shaft close to the force limiting member, and the shaft sleeve can be transmission-connected to the brake shaft; the shaft sleeve is sleeved outside one end of the force limiting member close to the brake shaft, and the shaft sleeve can be transmission-connected to the force limiting member.

[0005] According to the first aspect, in a possible implementation, the seat belt retractor further includes a core shaft, the core shaft is sleeved outside the force limiting member and is drivingly connected to an end of the force limiting member away from the brake shaft, and the core shaft is used for winding the webbing.

[0006] According to the first aspect, in a possible implementation, there is a gap between the core shaft and the sleeve along the axial direction of the brake shaft, so that when the brake shaft is in a locked state, the webbing can drive the core shaft to rotate.

[0007] According to the first aspect, in a possible implementation, the seat belt retractor also includes a driving wheel, and the driving wheel is arranged outside the sleeve; when the brake shaft is in an unlocked state, the driving wheel drives the sleeve to rotate, so that the sleeve drives the brake shaft and the force limiting member to rotate, and drives the core shaft to rotate through the force limiting member.

[0008] According to the first aspect, in a possible implementation, the sleeve includes a first-step shaft and a second-step shaft connected to each other, the drive wheel sleeve is arranged outside the first-step shaft, and one end of the second-step shaft connected to the first-step shaft forms a step surface, and the step surface is limited and stopped at the drive wheel.

[0009] According to the first aspect, in a possible implementation, a gap is provided between the core shaft and the second-step shaft along the axial direction of the brake shaft, so that when the brake shaft is in a locked state, the webbing can drive the core shaft to rotate.

[0010] According to the first aspect, in a possible implementation, a receiving groove is opened at one end of the core shaft, the second-step shaft is received in the receiving groove, and there is a gap between the end surface of the second-step shaft and the groove wall of the receiving groove along the axial direction of the brake shaft.

[0011] According to the first aspect, in a possible implementation manner, the seat belt retractor further includes a friction plate, and the friction plate is arranged between an outer side wall of the second-step shaft and a groove wall of the accommodating groove.

[0012] According to the first aspect, in a possible implementation manner, a thickness of the first-step shaft along the axial direction is smaller than a thickness of the driving wheel along the axial direction.

[0013] According to the first aspect, in a possible implementation manner, the first-order shaft is spline-connected to the driving wheel.

[0014] According to the first aspect, in a possible implementation, the seat belt retractor also includes a mounting bracket, the mounting bracket includes a first support assembly and a second support assembly, the end of the core shaft away from the sleeve is rotatably connected to the first support assembly, and the end of the brake shaft away from the sleeve is rotatably connected to the second support assembly; the core shaft is at least partially located between the two support assemblies, and the portion of the core shaft located between the two support assemblies is wound with a webbing.

[0015] According to the first aspect, in a possible implementation, a first center hole and a second center hole are formed at both ends of the sleeve respectively; one end of the force-limiting member extends into the first center hole and has an interference fit with the sleeve; the brake shaft is convexly provided with a connecting portion, which extends into the second center hole and has an interference fit with the sleeve.

[0016] According to the first aspect, in a possible implementation manner, a length of the second center hole along the axial direction is greater than a length of the connecting portion along the axial direction.

[0017] According to the first aspect, in a possible implementation manner, the first center hole is connected to the second center hole along the axial direction of the brake shaft.

[0018] According to the first aspect, in a possible implementation, a first center hole and a second center hole are formed at both ends of the sleeve respectively; one end of the force limiting member extends into the first center hole and is spline-connected to the sleeve; the brake shaft is convexly provided with a connecting portion, which extends into the second center hole and is spline-connected to the sleeve.

[0019] In a second aspect, an embodiment of the present application further provides a seat belt assembly, the seat belt assembly comprising a webbing and the seat belt retractor described in the first aspect, the webbing being at least partially connected to the core shaft.

[0020] In a third aspect, an embodiment of the present application further provides a vehicle, comprising the seat belt assembly described in the second aspect.

[0021] The seat belt retractor, seat belt assembly and vehicle provided by the present application, the force limiting component and brake shaft of the seat belt retractor are both connected to the shaft sleeve, that is, the force limiting component and the brake shaft have no overlapping part along the axial direction of the brake shaft and there may even be a gap; the above structure can shorten the length of the force limiting component and the brake shaft, realize the force transmission by the shaft sleeve, reduce the processing accuracy requirement, make the relative position between the force limiting component and the brake shaft more flexible, facilitate assembly, and reduce the accuracy requirement of the brake shaft and the force limiting component themselves, which significantly reduces the manufacturing difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of a seat belt assembly provided in one embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of a seat belt retractor provided in one embodiment of the present application.

[0025] Figure 3 yes Figure 2 Illustration of the seat belt retractor with the mounting bracket removed.

[0026] Figure 4 yes Figure 3 An enlarged schematic diagram of a local area A.

[0027] Figure 5 yes Figure 2 A three-dimensional schematic diagram of a seat belt retractor shaft sleeve from one perspective is shown.

[0028] Figure 6 yes Figure 2 A perspective schematic diagram of the shaft sleeve of the seat belt retractor shown in another perspective.

[0029] Description of reference numerals:

[0030] 1000-seat belt assembly; 100-seat belt retractor; 10-mounting bracket; 11-support assembly; 111-leg; 112-housing; 121-accommodating chamber; 20-core shaft; 21-hollow portion; 23-accommodating groove; 25-first pivoting portion; 30-brake shaft; 31-connecting portion; 33-stop edge; 35-second pivoting portion; 40-force-limiting member; 41-first end; 43-deformation portion; 45-second end; 50-sleeve; 51-first step shaft; 52-second step shaft; 54-first center hole; 55-second center hole; 57-step surface; 60-driving wheel; 70-driving assembly; 71-guide tube; 73-mass body; 81-friction plate; 101-webbing. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0034] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] The present application provides a vehicle, including a seat belt assembly, which is used to restrain passengers and improve the safety of the vehicle during driving.

[0036] See also Figure 1The present application provides a seat belt assembly 1000, including a seat belt retractor 100 and a webbing 101. The seat belt retractor 100 is used to retract and release the webbing 101, and when the vehicle encounters an accident such as an emergency stop or rollover, the seat belt retractor 100 can prevent the webbing 101 from being pulled out too long, thereby restraining the occupant on the seat of the vehicle, making the vehicle safer to drive.

[0037] See also Figure 2 and Figure 3 The present application provides a seat belt retractor 100, comprising a mounting bracket 10, a spindle 20, a brake shaft 30, a force-limiting member 40, a sleeve 50, a driving wheel 60 and a driving assembly 70; the spindle 20 and the brake shaft 30 are rotatably mounted on the mounting bracket 10, the force-limiting member 40 has a first end and a second end, the force-limiting member 40 is arranged in the spindle 20 and is arranged with the brake shaft 30 along a first direction X, and the first direction X is the axial direction of the brake shaft 30; the first end of the force-limiting member 40 is arranged close to the brake shaft 30, and the second end of the force-limiting member 40 is transmission-connected with the spindle 20; the sleeve 50 is sleeved on the first end of the force-limiting member 40 and the brake shaft 30, and the driving wheel 60 is sleeved on the sleeve 50.

[0038] The seat belt retractor 100 is used in Figure 1 In the safety belt assembly 1000 shown, the brake shaft 30 has a locked state and an unlocked state. The locking scheme of the brake shaft 30 can be achieved by using the ratchet and locking pawl, gear, pin and socket commonly used in the art to achieve locking, which will not be described in detail in this application.

[0039] When the brake shaft 30 is in the unlocked state, since both the core shaft 20 and the brake shaft 30 can rotate relative to the mounting bracket 10, the force borne by the force-limiting member 40 will not exceed the force limited by the force-limiting member 40. At this time, the force-limiting member 40 can be regarded as a rigid component, and the core shaft 20 is connected to the sleeve 50 through the force-limiting member 40, and the sleeve 50 is connected to the brake shaft 30. The driving assembly 70 drives the driving wheel 60 to rotate, and the driving wheel 60 drives the brake shaft 30 to rotate through the sleeve 50, and the sleeve 50 drives the core shaft 20 to rotate synchronously through the force-limiting member 40 so that the core shaft 20 winds and tightens the webbing 101; or the occupant pulls the webbing 101, the webbing 101 drives the core shaft 20 to rotate, and the core shaft 20 drives the brake shaft 30 to rotate through the force-limiting member 40 and the sleeve 50, so that the webbing 101 is pulled out of one end to a distance suitable for restraining occupants of different body shapes.

[0040] When the brake shaft 30 is in a locked state, the brake shaft 30, the first end of the force-limiting member 40, the shaft sleeve 50 and the driving wheel 60 are all stationary relative to the mounting bracket 10; when the force exerted by the webbing 101 on the core shaft 20 exceeds the limited force of the force-limiting member 40, the force-limiting member 40 is deformed, and the webbing 101 can pull the core shaft 20 to rotate a certain angle, so that the webbing 101 extends a certain distance, thereby preventing the webbing 101 from exerting excessive restraint on the occupant and causing harm to the occupant.

[0041] In this embodiment, the force-limiting member 40 and the brake shaft 30 are both connected to the shaft sleeve 50, that is, the force-limiting member 40 and the brake shaft 30 do not have overlapping parts along the first direction X, and there may even be a gap. When the specifications of the webbing 101 used in the seat belt retractor 100 remain unchanged, the above structure can shorten the length (axial length) of the brake shaft 30 and the force-limiting member 40 along the first direction X, making the overall layout of the seat belt retractor 100 compact and small in size. In addition, the brake shaft 30 and the force-limiting member 40 do not overlap in the first direction X, and the force is transmitted through the shaft sleeve 50, so that the relative position between the two is more flexible, which is convenient for assembly and reduces the precision requirements of the brake shaft 30 and the force-limiting member 40 themselves, significantly reducing the manufacturing difficulty and cost.

[0042] The bushing 50 supports the limiting core shaft 20 along the radial direction of the brake shaft 30, and there is a gap between the bushing 50 and the core shaft 20 along the first direction X. In this embodiment, the brake shaft 30, the force limiting member 40, the driving wheel 60 and the core shaft 20 are connected through the bushing 50, so as to avoid integrating too many functions and connection structures on the brake shaft 30, simplify the structure of the core shaft 20, and make the functions of each component unified, thereby further reducing the manufacturing difficulty and cost of each component.

[0043] In some embodiments, see Figure 2 and Figure 3 The mandrel 20 has a hollow portion 21, and one end of the mandrel 20 close to the brake shaft 30 forms an opening connected to the hollow portion 21. The force-limiting member 40 extends into the hollow portion 21 from the opening, and the second end of the force-limiting member 40 is fixedly connected to the inner wall of the hollow portion 21 to achieve torque transmission between the second end and the mandrel 20, for example, a key connection, interference fit, pin connection, etc. can be used; the first end of the force-limiting member 40 extends out from the opening. The end of the mandrel 20 away from the brake shaft 30 forms a first pivoting portion 25, and the first pivoting portion 25 is rotatably connected to the mounting bracket 10.

[0044] A receiving groove 23 is provided at one end of the core shaft 20 close to the brake shaft 30, which can reduce the weight of the core shaft 20 and save materials. The wall surface of the receiving groove 23 facing the brake shaft 30 is the bottom wall, and the other wall surfaces are the side walls. Part of the structure of the sleeve 50 is accommodated in the receiving groove 23, and the sleeve 50 supports the side wall of the receiving groove 23 along the radial direction of the brake shaft 30, and there is a gap between the end surface of the sleeve 50 and the bottom wall of the receiving groove 23. Therefore, the brake shaft 30 is in a locked state, reducing or even eliminating the friction between the bottom surface of the receiving groove 23 and the end surface of the sleeve 50 when the core shaft 20 rotates under the pull of the webbing 101.

[0045] In some embodiments, see Figure 2 and Figure 3 The brake shaft 30 includes a connecting portion 31, a stop edge 33, and a second pivoting portion 35 that are sequentially connected along a first direction X; the connecting portion 31 penetrates into the interior of the sleeve 50 and is transmission-connected to the sleeve 50, for example, a key connection, an interference fit, a pin connection, etc. can be adopted. The second pivoting portion 35 is rotationally connected to the mounting bracket 10. The stop edge 33 protrudes from the connecting portion 31 along the first direction X, and the stop edge 33 cooperates with the end surface of the core shaft 20 facing the brake shaft 30 to limit the axial position of the driving wheel 60, so as to avoid axial movement during the process of the driving wheel 60 driving the sleeve 50 to rotate, thereby ensuring the smoothness and stability of the webbing 101 during the retraction and release process.

[0046] In some embodiments, see Figure 2 and Figure 3 The force-limiting member 40 includes a first end 41, a deformation portion 43, and a second end 45 connected in sequence along the first direction X. The cross-sectional area of ​​the deformation portion 43 is smaller than the cross-sectional area of ​​the first connection portion 31 and the cross-sectional area of ​​the second connection portion 31, that is, the first end 41 and the second end 45 protrude from the deformation portion 43 in the radial direction of the brake shaft 30 to prevent the deformation portion 43 from contacting the inner wall of the hollow portion 21 when deforming.

[0047] The force-limiting member 40 undergoes plastic deformation under the force of the core shaft 20 , that is, the force-limiting member 40 cannot be restored after deformation, and a new force-limiting member 40 or the entire seat belt retractor 100 needs to be replaced to avoid safety hazards caused by repeated use of the force-limiting member 40 .

[0048] In some embodiments, see Figure 2 and Figure 3The mounting bracket 10 includes two support assemblies 11. For the convenience of description, the two support assemblies 11 are respectively a first support assembly and a second support assembly. The end of the core shaft 20 away from the sleeve 50 is rotatably connected to the first support assembly, and the end of the brake shaft 30 away from the sleeve 50 is rotatably connected to the second support assembly. The core shaft 20 is at least partially located between the two support assemblies 11, and the portion of the core shaft 20 located between the two support assemblies 11 is wound with the webbing 101. Specifically, the first pivoting portion 25 on the core shaft 20 is rotatably connected to the first support assembly, and the second pivoting portion 35 on the brake shaft 30 is connected to the second support assembly. When the brake shaft 30 is in an unlocked state, the core shaft 20, the brake shaft 30, the force limiting member 40 and the sleeve 50 can be regarded as a whole, and the two ends of the whole are respectively rotatably connected to the first support assembly and the second support assembly, so that the driving wheel 60 drives the whole to rotate to achieve the retraction of the webbing 101.

[0049] The second support assembly includes a support leg 111 and a housing 112, a receiving cavity 121 is formed between the support leg 111 and the housing 112, and a through hole communicating with the receiving cavity 121 is provided on the support leg 111; the core shaft 20 passes through the through hole, the driving wheel 60 is received in the receiving cavity 121, and the brake shaft 30 is rotatably connected to the housing 112. The receiving cavity 121 protects the internal transmission structure (driving wheel 60, shaft sleeve 50 and brake shaft 30), and at the same time, the two support assemblies 11 limit the axial position of the webbing 101 to prevent the webbing 101 from axially moving to the transmission structure.

[0050] Similar to the second support assembly, the first support assembly also includes a leg 111 and a housing 112, and a receiving cavity 121 is formed between the leg 111 and the housing 112. The receiving cavity 121 of the second support assembly is used to accommodate the first pivoting portion 25 of the core shaft 20. The two ends of the core shaft 20 pass through the legs 111 of the first support assembly and the legs 111 of the second support assembly respectively, defining a portion for winding the webbing 101. In addition, the housing 112 of the first support assembly is provided with a mounting position, which cooperates with the first pivoting portion 25 of the core shaft 20. The core shaft 20 and the mounting position are elastically connected along the first direction X. When the force of the webbing 101 on the core shaft 20 has a component force along the first direction X, or when the force limiting member 40 is deformed, the core shaft 20 can be pushed to move a distance along the first direction X to avoid the core shaft 20 from getting stuck, which is conducive to the rotation of the core shaft 20.

[0051] In some embodiments, see Figure 2 and Figure 3The driving component 70 includes a guide tube 71, a gas generator (not shown) and a mass body 73. One end of the guide tube 71 is connected to the gas generator, and the other end of the guide tube 71 extends into the accommodating cavity 121 and is arranged toward the driving wheel 60. The mass body 73 is arranged in the guide tube 71. When the gas generator is activated, a large amount of gas is released. The gas is filled into the guide tube 71 to drive the mass body 73 to move in the guide tube 71. The mass body 73 leaves the guide tube 71 and pushes the driving wheel 60. The driving wheel 60 drives the rotating mechanism to rotate, thereby realizing the action of winding the webbing 101.

[0052] See also Figures 4 to 6 Two step shafts of different sizes (a first step shaft 51 and a second step shaft 52) ​​are arranged on the outer side of the sleeve 50, and two inner holes of different sizes (a first middle hole 54 and a second middle hole 55) are arranged on the inner side of the sleeve 50.

[0053] The first step shaft 51 is sleeved with a driving wheel 60, and a step surface 57 is formed on the side where the second step shaft 52 is connected to the first step shaft 51. The step surface 57 is limited and stopped by the driving wheel 60, thereby determining the installation position of the driving wheel 60. The other side of the driving wheel 60 along the first direction X is limited by the brake member stop edge 33. The second step shaft 52 is received in the receiving groove 23 of the mandrel 20, and the second step shaft 52 radially supports the mandrel 20, and one end of the mandrel 20 facing the brake shaft 30 is in close contact with the driving wheel 60, so that the entire axial dimension chain of the seat belt retractor 100 is closed, so that the finished product of the seat belt retractor 100 has high consistency after assembly.

[0054] The thickness of the first-step shaft 51 along the first direction X is less than the length of the driving wheel 60 along the first direction X. Thus, after the brake shaft 30, the shaft sleeve 50 and the driving wheel 60 are assembled, only a force needs to be applied along the first direction X to achieve the effect that the step surface 57 and the stop edge 33 limit and stop the driving wheel 60 along the first direction X; and there is no need to specially design the structure of the stop edge 33, which facilitates the processing of the brake shaft 30. If the thickness of the first-step shaft 51 along the first direction X is greater than or equal to the length of the driving wheel 60 along the first direction X, a protruding structure needs to be provided on the side of the stop edge 33 facing the mandrel 20 to limit and stop the driving wheel 60.

[0055] The thickness of the second-step shaft 52 along the first direction X is smaller than the depth of the accommodating groove 23 along the first direction X, thereby forming a gap between the end face of the second-step shaft 52 and the bottom wall of the accommodating groove 23. This reduces the friction force on the core shaft 20 and the axial dimension of the sleeve 50, thereby reducing the length of the axial processing dimension of the sleeve 50, reducing the material usage of the sleeve 50, and reducing the material cost and the processing cost of the outside of the sleeve 50.

[0056] In order to reduce the friction loss between the core shaft 20 and the sleeve 50, a friction plate 81 may be provided between the outer side wall of the second-stage shaft 52 and the side wall of the receiving groove 23, and the friction plate 81 may be replaced on time to prevent aging.

[0057] Since the motion states of the driving wheel 60, the shaft sleeve 50 and the brake shaft 30 are always consistent, when assembling the seat belt retractor 100, the driving wheel 60, the shaft sleeve 50 and the brake shaft 30 can be first fixedly connected together to form a whole, and then other parts can be assembled.

[0058] In the first example, the first end of the force-limiting member 40 extends into the first center hole 54 and has an interference fit with the sleeve 50. The brake shaft 30 is provided with a protruding connecting portion 31, which extends into the second center hole 55 and has an interference fit with the sleeve 50. The sleeve 50 drives the force-limiting member 40 and the driving wheel 60 to rotate by the interference fit.

[0059] In the second example, the first end of the force-limiting member 40 extends into the first center hole 54 and is spline-connected to the sleeve 50. The brake shaft 30 is provided with a protruding connecting portion 31, which extends into the second center hole 55 and is spline-connected to the sleeve 50. The sleeve 50 drives the force-limiting member 40 and the driving wheel 60 to rotate by an interference fit.

[0060] That is, the portion (second end 45) where the force-limiting member 40 is connected to the first center hole 54 and the connecting portion 31 both form a spline structure, the first center hole 54 forms a keyway that matches the spline structure of the force-limiting member 40, and the second center hole 55 forms a keyway that matches the spline structure of the connecting portion 31. The spline connection can stably transmit torque, and at the same time, both the force-limiting member 40 and the brake wheel are interference-fitted with the sleeve 50, which can prevent the sleeve 50 from driving the force-limiting member 40 and the connecting portion 31. In other embodiments, the force-limiting member 40, the brake shaft 30 and the sleeve 50 can also be matched with a keyway, or a polygonal shaft can be used to transmit torque.

[0061] The length of the second middle hole 55 along the first direction X is greater than the length of the connecting portion 31 along the first direction X, which can avoid the situation that the stop edge 33 cannot fit the end of the sleeve 50 after the connecting portion 31 of the brake shaft 30 is inserted in place, and ensures that the stop edge 33 first contacts the driving wheel 60, so that the stop edge 33 and the second-stage shaft 52 cooperate to limit the driving wheel 60. In addition, the length of the connecting portion 31 is relatively short, which can reduce the material of the brake shaft 30, reduce the weight of the brake shaft 30, and also reduce the processing time of the brake shaft 30 in the first direction X, and reduce the processing cost.

[0062] The first center hole 54 and the second center hole 55 can be connected along the first direction X. Since the connecting portion 31 of the brake shaft 30 is not inserted into the bottom of the second center hole 55, after the force limiting member 40 is inserted into the first center hole 54, there is a gap between the force limiting member 40 and the brake shaft 30 along the first direction X. Therefore, without affecting the assembly and transmission of other parts, the axial size of the sleeve 50 is reduced, thereby reducing the material of the sleeve 50 and reducing the weight of the sleeve 50. At the same time, it can also reduce the axial processing time of the sleeve 50 and reduce the processing cost.

[0063] It can be understood that the connection between the first-step shaft 51 and the second-step shaft 52 and the connection between the first center hole 54 and the second center hole 55 can be staggered; that is, the first center hole 54 and the second center hole 55 both participate in the transmission, while no transmission is performed between the second-step shaft 52 and the core shaft 20. The length of the first center hole 54 can be greater than the length of the first-step shaft 51, thereby controlling the overall length of the sleeve 50.

[0064] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0065] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A seat belt retractor, characterized in that: The seat belt retractor includes a brake shaft, a force-limiting component and a shaft sleeve. The force-limiting component and the brake shaft are arranged along the axial direction of the brake shaft. The shaft sleeve is sleeved outside one end of the brake shaft close to the force-limiting component, and the shaft sleeve can be transmission-connected to the brake shaft; the shaft sleeve is sleeved outside one end of the force-limiting component close to the brake shaft, and the shaft sleeve can be transmission-connected to the force-limiting component.

2. The seat belt retractor according to claim 1, characterized in that: The seat belt retractor further comprises a core shaft, which is sleeved outside the force-limiting component and drivingly connected to one end of the force-limiting component away from the brake shaft, and the core shaft is used for winding the webbing.

3. The seat belt retractor according to claim 2, characterized in that: There is a gap between the core shaft and the sleeve along the axial direction of the brake shaft, so that when the brake shaft is in a locked state, the webbing can drive the core shaft to rotate.

4. The seat belt retractor according to claim 2, characterized in that: The seat belt retractor also includes a driving wheel, which is sleeved outside the shaft sleeve; when the brake shaft is in an unlocked state, the driving wheel drives the shaft sleeve to rotate, so that the shaft sleeve drives the brake shaft and the force-limiting component to rotate, and drives the core shaft to rotate through the force-limiting component.

5. The seat belt retractor according to claim 4, characterized in that: The shaft sleeve includes a first-step shaft and a second-step shaft connected to each other, the driving wheel sleeve is arranged outside the first-step shaft, and one end of the second-step shaft connected to the first-step shaft forms a step surface, and the step surface is limited and stopped by the driving wheel.

6. The seat belt retractor according to claim 5, characterized in that: A gap is provided between the core shaft and the second-stage shaft along the axial direction of the brake shaft, so that when the brake shaft is in a locked state, the webbing can drive the core shaft to rotate.

7. The seat belt retractor according to claim 6, characterized in that: One end of the core shaft is provided with a receiving groove, the second-step shaft is received in the receiving groove, and a gap is provided between the end surface of the second-step shaft and the groove wall of the receiving groove along the axial direction of the brake shaft.

8. The seat belt retractor according to claim 7, characterized in that: The seat belt retractor further comprises a friction plate, and the friction plate is arranged between the outer side wall of the second-stage shaft and the groove wall of the accommodating groove.

9. The seat belt retractor according to claim 5, characterized in that: The thickness of the first-order shaft along the axial direction is smaller than the thickness of the driving wheel along the axial direction.

10. The seat belt retractor according to claim 5, characterized in that: The first-order shaft is spline-connected to the driving wheel.

11. The seat belt retractor according to claim 2, characterized in that: The seat belt retractor also includes a mounting bracket, which includes a first support assembly and a second support assembly. One end of the core shaft away from the sleeve is rotatably connected to the first support assembly, and one end of the brake shaft away from the sleeve is rotatably connected to the second support assembly; the core shaft is at least partially located between the two support assemblies, and the part of the core shaft located between the two support assemblies is wound with a webbing.

12. The seat belt retractor according to claim 1, characterized in that: The two ends of the sleeve respectively form a first center hole and a second center hole; one end of the force-limiting member extends into the first center hole and has an interference fit with the sleeve; the brake shaft is convexly provided with a connecting portion, which extends into the second center hole and has an interference fit with the sleeve.

13. The seat belt retractor according to claim 12, characterized in that: A length of the second central hole along the axial direction is greater than a length of the connecting portion along the axial direction.

14. The seat belt retractor according to claim 12, characterized in that: The first center hole is communicated with the second center hole along the axial direction of the brake shaft.

15. The seat belt retractor according to claim 1, characterized in that: The two ends of the sleeve respectively form a first center hole and a second center hole; one end of the force-limiting member extends into the first center hole and is spline-connected with the sleeve; the brake shaft is convexly provided with a connecting portion, which extends into the second center hole and is spline-connected with the sleeve.

16. A seat belt assembly, characterized in that: The seat belt assembly comprises a webbing and a seat belt retractor according to any one of claims 1 to 15, wherein the webbing is at least partially connected to the core shaft.

17. A vehicle, characterized in that: The vehicle includes the seat belt assembly according to claim 16.

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