Safety belt retractor and car seat

Abstract

The present application provides a seatbelt retractor and a car seat. The seatbelt retractor includes a cam plate assembly, a transmission assembly, and a locking swing assembly. The cam plate assembly is disposed on a first end surface of a mechanical plate, the first end surface of the mechanical plate being the end surface of the mechanical plate facing the locking cover. The transmission assembly is connected between a spindle and the cam plate assembly, and driven by the spindle, the transmission assembly drives the cam plate assembly to rotate. During rotation, the cam plate assembly forms an abutment position and a disengagement position relative to the locking swing assembly. The locking swing assembly is movably disposed within a notch in an edge of the mechanical plate. In the relative abutment position, it swings into abutment with the cam plate assembly, separating the locking swing assembly from the ratchet assembly to enter an unlocked state. In this unlocked state, the webbing can be rewound and withdrawn. In the relative disengagement position, it swings into abutment with the cam plate assembly, contacting the locking swing assembly with the ratchet assembly to enter a locked state. In this locked state, the webbing can be rewound and withdrawn.

Description

Technical Field

[0001] The present application relates to the field of automobile safety technology, and in particular to a seat belt retractor and also to an automobile seat. Background Art

[0002] With the continuous improvement of people's living standards, cars have become an indispensable means of transportation, and people's demand for car comfort is also increasing. Among them, seats are a key component of the car safety system. Because children are much smaller than adults, ordinary car seat belts are not effective in protecting children in car seats. Inappropriate wearing can even cause injury to children. Moreover, children are more active than adults. Without effective child protection measures, children are easily endangered in accidents such as collisions while riding in cars.

[0003] Therefore, the seat belt retractor is required to not only protect adults, but also effectively protect children. When the car collides, the children are well fixed on the seat to minimize the harm to the children. Summary of the Invention

[0004] This application provides a seatbelt retractor that solves the existing problem of effectively securing a child seat while also enabling flexible switching between a child protection function and a lock-off function, enabling adults and children to share a seatbelt. This solves the problem that conventional emergency locking seatbelts cannot be installed on reversible seats. This application also provides a car seat using the seatbelt retractor.

[0005] The present application provides a seat belt retractor, comprising a retractor body provided on a car seat, a mechanical plate, a core shaft and a locking cover provided on the retractor body, a ratchet assembly provided on the inner side of the mechanical plate, a vehicle sensing assembly provided in a vehicle sensing accommodation structure of the mechanical plate, and a counterweight connected to the vehicle sensing assembly, and further comprising: a cam plate assembly, a transmission assembly and a locking swing assembly;

[0006] The cam plate assembly is provided on the first end surface of the mechanical plate; the first end surface of the mechanical plate is the end surface of the mechanical plate facing the locking cover;

[0007] The transmission assembly is connected between the core shaft and the cam plate assembly, so that the core shaft drives the cam plate assembly to rotate through the transmission assembly, and the cam plate assembly forms an abutment position and a separation position relative to the locking swing assembly during the rotation process;

[0008] The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate, and is swung relative to the abutting position to abut against the cam disc assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state, and in the unlocked state, the webbing can be rewound and pulled out; it is swung relative to the separation position to separate from the cam disc assembly, so that the locking swing assembly contacts the ratchet assembly to be in a locked state, and in the locked state, the webbing can be rewound and cannot be pulled out.

[0009] Optionally, the cam plate assembly includes a driving cam plate and a follower cam plate;

[0010] The follower cam disc is mounted on a limit support ring provided on the first end surface of the mechanical plate and is rotatable relative to the limit support ring; an abutment portion is provided on the outer periphery of the follower cam disc to form an abutment position relative to the locking swing assembly during rotation, and the locking swing assembly abuts against the abutment portion at the abutment position;

[0011] The driving cam disc is mounted on the follower cam disc and is connected to the transmission assembly so as to rotate under the drive of the transmission assembly and to lift the locking swing assembly during rotation to separate the locking swing assembly from the abutment portion; at the same time, the driving cam disc drives the follower cam disc to rotate so as to form a separated position relative to the locking swing assembly during the rotation of the follower cam disc.

[0012] Optionally, the follower cam plate includes an integrally formed connection support ring, a cam surface, a limit connection groove, a switching block and an abutment notch;

[0013] The connecting support ring is sleeved on the limiting support ring and can rotate relative to the limiting support ring;

[0014] The cam surface is arranged on a partial outer periphery of the connecting support ring;

[0015] The abutment notch is provided at the end portion of the outer peripheral edge of the cam surface; the abutment notch is the abutment portion of the follower cam disc;

[0016] The limiting connection groove is recessed on the radial end surface of the connection support ring;

[0017] The switching block is arranged in the limiting connection groove.

[0018] Optionally, the driving cam plate includes an integrally formed support ring body, a connecting gear ring, a first cam surface, a second cam surface, and a boss connecting surface;

[0019] The connecting gear ring is protruding from the first radial end surface of the supporting ring body, the connecting gear ring has a rack provided on the inner ring, and the transmission assembly is connected to the rack of the connecting gear ring;

[0020] The first cam surface is arranged on a partial outer periphery of the supporting ring body;

[0021] The second cam surface is provided at an end portion of a partial outer circumference of the first cam surface, and the second cam surface forms a slope surface relative to the first cam surface on both sides of the support ring body in the circumferential direction; in the radial direction, the second cam surface protrudes beyond the cam surface of the follower cam plate, and the second cam surface can lift the locking swing assembly when the driving cam plate rotates;

[0022] The boss connection surface is protrudingly provided on the second radial end surface of the support ring body, and the boss connection surface is distributed around one-third of the support ring body, and has a locking end and an unlocking end; the boss connection surface is clamped in the limiting connection groove; the second radial end surface faces the follower cam disc;

[0023] When the webbing is pulled out, the transmission assembly drives the driving cam disc to rotate clockwise by a first angle, and the second cam surface lifts the locking swing assembly. At the same time, the locking end of the boss connecting surface contacts the switching block to drive the cam surface of the follower cam disc to separate from the locking swing assembly, so that the locking swing assembly contacts the ratchet assembly to enter a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.

[0024] When the webbing is rewound, the transmission assembly drives the driving cam disc to rotate counterclockwise to a second angle, and the second cam surface lifts the locking swing assembly. At the same time, the unlocking end of the boss connecting surface contacts the switching block to drive the cam surface of the follower cam disc to contact the locking swing assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out.

[0025] Optionally, the driving cam plate further comprises a spring structure, which is arranged on the outer periphery of the supporting ring body and is used to suppress the follower cam plate to prevent abnormal noise.

[0026] Optionally, the locking swing assembly includes: a support column, a control rod, a torsion spring and a limiting structure;

[0027] The support column is arranged on the periphery of the mechanical plate in a direction perpendicular to the first end surface of the mechanical plate;

[0028] The control rod is movably connected to the support column;

[0029] The limiting structure is provided on the control rod and the mechanical plate;

[0030] The torsion spring is connected to the limiting structure and can provide a reset torque to the control rod, so that the control rod abuts against the abutting portion of the follower cam disc and contacts the ratchet assembly under the driving of the reset torque.

[0031] Optionally, the control rod comprises: a connecting body, an abutting arm, a lifting arm and a connecting hole;

[0032] The connecting hole is provided on the connecting body, and the hole direction of the connecting hole is provided in a direction perpendicular to the first end surface of the mechanical plate; the supporting column is sleeved in the connecting hole;

[0033] The abutment arms are integrally formed with the connecting body, and when the connecting body is sleeved onto the support column through the connecting hole, the abutment arms are distributed along the circumference of the mechanical plate; the protrusions on the abutment arms can engage with the abutment notches on the outer circumference of the cam surface;

[0034] The lifting arm is connected to the abutting arm along a direction perpendicular to the first end surface of the mechanical plate; and the lifting arm can contact the second cam surface.

[0035] Optionally, the limiting structure includes: a limiting groove, a first limiting block, a second limiting block and a limiting hole;

[0036] The limiting groove is provided on the circumferential end surface of the connecting body, and the main body of the torsion spring is sleeved in the limiting groove;

[0037] The first limiting block is provided on the lifting arm, and the first end of the torsion spring abuts between the abutting arm and the first limiting block;

[0038] The second limiting block is arranged on the periphery of the mechanical plate, and the limiting hole is arranged on the second limiting block; the second end of the torsion spring is inserted into the limiting hole of the second limiting block.

[0039] Optionally, the transmission assembly includes a first connecting gear shaft, a support pillow block and a second connecting gear shaft;

[0040] The first connecting gear shaft is connected to the connecting end of the core shaft and is located on the first end surface of the mechanical plate;

[0041] The support pillow is arranged on the first end surface of the mechanical plate and is located on the side of the center of the mechanical plate;

[0042] The second connecting gear shaft is movably arranged on the support shaft platform, and the second connecting gear shaft includes a first-stage gear shaft and a second-stage gear shaft. The first-stage gear shaft is meshed with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft is meshed with the rack of the connecting gear ring.

[0043] The present application also provides a car seat, which includes any one of the above-mentioned seat belt retractors.

[0044] Compared with the prior art, this application has the following advantages:

[0045] The present application provides a seat belt retractor, comprising a retractor body mounted on a vehicle seat, a mechanical plate, a spindle, and a locking cover mounted on the retractor body, a ratchet assembly mounted on the inner side of the mechanical plate, a vehicle sensing assembly mounted in a vehicle sensing housing structure of the mechanical plate, and a counterweight connected to the vehicle sensing assembly, and further comprising: a cam plate assembly, a transmission assembly, and a locking swing assembly. The cam plate assembly is mounted on a first end face of the mechanical plate, the first end face of the mechanical plate being the end face of the mechanical plate facing the locking cover. The transmission assembly is connected between the spindle and the cam plate assembly, so that the transmission assembly drives the cam plate assembly to rotate under the drive of the spindle. During rotation, the cam plate assembly forms an abutment position and a separation position relative to the locking swing assembly. The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate, and is swung relative to the abutting position to abut against the cam disc assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state, and in the unlocked state, the webbing can be rewound and pulled out; it is swung relative to the separation position to separate from the cam disc assembly, so that the locking swing assembly contacts the ratchet assembly to be in a locked state, and in the locked state, the webbing can be rewound and cannot be pulled out.

[0046] The seat belt retractor provided in the present application has a compact structure and a reasonable design. It can be conveniently connected to an external child protection locking mechanism without changing the original seat belt structure, that is, a child protection locking mechanism function is added to an ordinary emergency locking seat belt, which not only saves modification costs but also effectively fixes the child seat, thereby protecting the safety of children in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application.

[0048] Figure 2 It is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of the present application.

[0049] Figure 3 It is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of the present application.

[0050] Figure 4 This is an exploded view of a seat belt retractor provided in an embodiment of the present application.

[0051] Figure 5 It is a three-dimensional diagram of the follower cam plate provided in an embodiment of the present application.

[0052] Figure 6 It is a cross-sectional view of the follower cam plate provided in an embodiment of the present application.

[0053] Figure 7 It is a three-dimensional diagram of the driving cam plate provided in an embodiment of the present application.

[0054] Figure 8 This is a schematic structural diagram of the driving cam plate provided in an embodiment of the present application in another direction.

[0055] Figure 9 It is a cross-sectional view of the driving cam plate provided in an embodiment of the present application.

[0056] Figure 10 Schematic diagram of the structure of the control rod provided in the embodiment of the present application.

[0057] Figure 11 It is a schematic diagram of the locking state of the locking member and the convex gear provided in an embodiment of the present application.

[0058] Figure 12 This is a schematic diagram of the unlocked state of the locking member and the convex gear provided in an embodiment of the present application.

[0059] Figure 13 This is a schematic diagram of the state in which the convex gear plate provided in an embodiment of the present application abuts against the swing arm.

[0060] Figure 14 It is a structural diagram of the vehicle sensing component provided in an embodiment of the present application.

[0061] Figure 15 It is a schematic structural diagram of the locking member provided in an embodiment of the present application.

[0062] Figure 16 This is a structural diagram of the transmission assembly and locking member provided in an embodiment of the present application installed on a mechanical plate.

[0063] Figure 17 It is a structural schematic diagram of the mechanical plate provided in an embodiment of the present application.

[0064] Reference numerals:

[0065] Retractor body 100, spindle 101, locking cover 102, mechanical plate 103, vehicle sensor accommodating structure 104, ratchet assembly 105, vehicle sensor assembly 106, vehicle sensor fixing seat 107, vehicle sensor body 108, vehicle sensor arm 109, convex gear 110, counterweight 111, vehicle sensor ball 112, position limiting support structure 113, position limiting support ring 114, position limiting body 115, anti-interference protrusion 116, protrusion 117, foot-picking structure 118, position limiting block 119, transmission assembly 1, first connecting gear shaft 11, support shaft platform 12, second connecting gear shaft 13, cam plate assembly 2, follower cam plate 3, connecting support ring 31, convex Wheel surface 32, limiting connecting groove 33, switching block 34, abutting notch 35, driving cam plate 4, support ring main body 40, connecting gear ring 41, first cam surface 42, second cam surface 43, boss connecting surface 44, locking end 441, unlocking end 442, spring structure 45, locking swing assembly 5, support column 51, control rod 52, connecting body 521, abutting arm 522, lifting arm 523, connecting hole 524, torsion spring 53, limiting structure 54, first limiting block 541, locking member 6, connecting ring 61, connecting arm 62, vertical arm 621, horizontal arm 622, swing arm 7, abutting claw arm 71, locking arm 72. DETAILED DESCRIPTION

[0066] The following description sets forth many specific details to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present application. Therefore, the present application is not limited to the specific implementations disclosed below.

[0067] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0069] In the related art, since children's bodies are much smaller than adults, ordinary car seat belts cannot effectively protect children in car seats, and may even cause injuries to children due to improper wearing. Moreover, children are more active than adults. If there is no effective measure to protect children, children are likely to be in danger if a collision or other accident occurs while riding in a car.

[0070] In light of this, the present application provides a seat belt retractor, comprising a retractor body disposed on a car seat, a mechanical plate, a core shaft, and a locking cover disposed on the retractor body, a ratchet assembly disposed on the inner side of the mechanical plate, a vehicle sensing assembly disposed in a vehicle sensing accommodation structure of the mechanical plate, and a counterweight connected to the vehicle sensing assembly, and further comprising: a cam plate assembly, a transmission assembly, and a locking swing assembly. The cam plate assembly is disposed on a first end face of the mechanical plate, and the first end face of the mechanical plate is the end face of the mechanical plate facing the locking cover. The transmission assembly is connected between the core shaft and the cam plate assembly, so that the convex tooth plate assembly is driven by the core shaft to rotate through the transmission assembly, and the convex tooth plate assembly forms an abutment position and a separation position relative to the locking swing assembly during rotation. The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate, and is swung relative to the abutting position to abut against the cam disc assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state, and in the unlocked state, the webbing can be rewound and pulled out; it is swung relative to the separation position to separate from the cam disc assembly, so that the locking swing assembly contacts the ratchet assembly to be in a locked state, and in the locked state, the webbing can be rewound and cannot be pulled out.

[0071] It can be understood that the seat belt retractor provided in the present application has a compact structure and a reasonable design. Without changing the original seat belt structure, it can be conveniently connected to an external child protection locking mechanism, that is, a child protection locking mechanism function is added to an ordinary emergency locking seat belt, which not only saves modification costs, but also effectively fixes the child seat, thereby protecting the safety of children in the car.

[0072] Next, the seat belt retractor provided by the present application will be described in detail with reference to the accompanying drawings. Figure 1 This is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application. Figure 2 It is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of the present application. Figure 3 It is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of the present application. Figure 4 This is an exploded view of a seat belt retractor provided in an embodiment of the present application. Figure 5 It is a three-dimensional diagram of the follower cam plate provided in an embodiment of the present application. Figure 6 It is a cross-sectional view of the follower cam plate provided in an embodiment of the present application. Figure 7 It is a three-dimensional diagram of the driving cam plate provided in an embodiment of the present application. Figure 8 This is a schematic structural diagram of the driving cam plate provided in an embodiment of the present application in another direction. Figure 9 It is a cross-sectional view of the driving cam plate provided in an embodiment of the present application. Figure 10 Schematic diagram of the structure of the control rod provided in the embodiment of the present application. Figure 11 It is a schematic diagram of the locking state of the locking member and the convex gear provided in an embodiment of the present application. Figure 12 This is a schematic diagram of the unlocked state of the locking member and the convex gear provided in an embodiment of the present application. Figure 13 This is a schematic diagram of the state in which the convex gear plate provided in an embodiment of the present application abuts against the swing arm. Figure 14 It is a structural diagram of the vehicle sensing component provided in an embodiment of the present application. Figure 15 It is a schematic structural diagram of the locking member provided in an embodiment of the present application. Figure 16 This is a structural diagram of the transmission assembly and locking member provided in an embodiment of the present application installed on a mechanical plate. Figure 17 It is a structural schematic diagram of the mechanical plate provided in an embodiment of the present application.

[0073] like Figures 1 to 17 As shown, the present application provides a seat belt retractor, which includes: a retractor body 100 provided on a car seat and a mechanical plate 103, a core shaft 101 and a locking cover 102 provided on the retractor body 100. The retractor body 100 includes a bracket assembly, a preload wheel, a torsion bar, a shaft head and a locking block assembly. The core shaft 101 is installed on the bracket assembly, the preload wheel is connected to one end of the core shaft 101, the torsion bar is provided inside the preload wheel, the shaft head is connected to the torsion bar, and the locking block assembly is connected to the shaft head. The seat belt retractor also includes a ratchet assembly 105 provided on the inner side of the mechanical plate 103. The mechanical plate 103 encapsulates the locking block assembly and the ratchet assembly 105 on the first side of the mechanical plate 103 relative to the bracket assembly, that is, on the inner side of the mechanical plate 103. The locking cover 102 encapsulates the mechanical plate 103 and is connected to the first side of the bracket assembly. The mechanical plate 103 also includes a vehicle sensor assembly 106 disposed within the vehicle sensor housing structure 104 and a counterweight 111 connected to the vehicle sensor assembly 106. The vehicle sensor assembly 106 includes a vehicle sensor mounting base 107, a vehicle sensor body 108, a vehicle sensor arm 109, a vehicle sensor ball 112, and a convex gear 110. The vehicle sensor mounting base 107 is mounted within the vehicle sensor housing structure 104, the vehicle sensor body 108 is mounted within the vehicle sensor mounting base 107, and the vehicle sensor ball 112 is housed within the vehicle sensor body 108. The vehicle sensor ball 112 is capable of driving the vehicle sensor arm 109. The convex gear 110 is connected to the vehicle sensor body 108 and rotates synchronously with the vehicle sensor body 108. The counterweight 111 is connected to the vehicle sensor body 108 so that the weight of the counterweight 111 drives the rotation of the vehicle sensor mounting base 107.

[0074] In this embodiment, the seatbelt retractor further includes a cam plate assembly 2, a transmission assembly 1, and a locking swing assembly 5. The cam plate assembly 2 is disposed on a first end surface of the mechanical plate 103, which faces the locking cover 102. The transmission assembly 1 is connected between the spindle 101 and the cam plate assembly 2. Driven by the spindle 101, the transmission assembly 1 drives the cam plate assembly to rotate. During rotation, the cam plate assembly forms an abutment position and a disengagement position relative to the locking swing assembly 5. The locking swing assembly 5 is movably disposed within a notch on the edge of the mechanical plate 103. When in the abutment position, it swings into contact with the cam plate assembly 2, disengaging the locking swing assembly 5 from the ratchet assembly 105 to enter an unlocked state. In this unlocked state, the webbing can be rewound and withdrawn. When in the relative separation position, it swings to separate from the cam plate assembly 2, so that the locking swing assembly 5 contacts the ratchet assembly 105 to be in a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.

[0075] The specific structure and connection relationship of each of the above components will be further described below.

[0076] Specifically, in this embodiment, the transmission assembly 1 includes a first connecting gear shaft 11, a support shaft platform 12 and a second connecting gear shaft 13. The first connecting gear shaft 11 is connected to the connecting end of the core shaft 101 and is located on the first end face of the mechanical plate 103. In one example, the first connecting gear shaft 11 includes a first connecting hole, a connecting column, a gear shaft and a circumferential groove. The connecting column and the gear shaft are coaxially integrated, and the connecting column is located on the side close to the mechanical plate. The circumferential groove is provided on the circumferential end face of the connecting column. The first connecting hole passes through the connecting column and the gear shaft. The connecting end of the core shaft 101 is connected to the first connecting hole to drive the first connecting gear shaft 11 to rotate synchronously. The support shaft platform 12 is provided on the first end face of the mechanical plate 103 and is located on the side of the center of the mechanical plate 103. The second connecting gear shaft 13 is movably mounted on the support shaft platform 12. The second connecting gear shaft 13 includes a second connecting hole 524 and a first-stage gear shaft and a second-stage gear shaft that are coaxially integrated. The second-stage gear shaft is located on the side close to the mechanical plate, and the second connecting hole 524 passes through the first-stage gear shaft and the second-stage gear shaft. The diameter of the first-stage gear shaft is larger than the diameter of the second-stage gear shaft. The support column 51 of the support shaft platform 12 is connected to the second connecting hole 524, so that the second connecting gear shaft 13 can rotate around the support column 51 of the support shaft platform 12 through the second connecting hole 524. The gear shafts of the first-stage gear shaft and the first connecting gear shaft 11 are on the same radial plane. The first-stage gear shaft is meshed with the gear shaft of the first connecting gear shaft 11, and the second-stage gear shaft is meshed with the rack of the connecting gear ring 41.

[0077] In this embodiment, a limiting support structure 113 is further provided, wherein the limiting support structure 113 is provided on the first end face of the mechanical plate 103, and the first end face of the mechanical plate 103 is the end face of the mechanical plate 103 facing the locking cover 102. Specifically, the limiting support structure 113 includes: a limiting support ring 114 and a limiting body 115. The limiting support ring 114 is provided on the first end face of the mechanical plate 103 around the center of the mechanical plate 103, and the limiting support ring 114 is circular. The limiting body 115 is provided on the first end face of the mechanical plate 103 and is located on the outside of the limiting support ring 114. In one example, a portion of the limiting body 115 is provided in an arc shape. The cam disc assembly 2 is slidably connected to the limiting support ring 114 and is confined between the limiting support ring 114 and the limiting body 115.

[0078] In this embodiment, the position-limiting support structure 113 further includes an anti-interference protrusion 116, which is disposed on the first end surface of the mechanical plate 103. The anti-interference protrusion 116 has a height greater than the height of the protrusions of the position-limiting support ring 114, the position-limiting body 115, and the transmission assembly 1 disposed on the first end surface of the mechanical plate 103. The anti-interference protrusion 116 is used to prevent the locking cover 102 from pressing down and interfering with the transmission assembly 1, the cam plate assembly 2, and the locking member 6. In one example, the anti-interference protrusion 116 includes an irregular arc-shaped body, a recessed portion, and a raised portion 117, which are integrally formed. The irregular arc-shaped body is disposed between the first connecting gear shaft 11 and the support shaft platform 12, and the recessed portion is located in the middle of the irregular arc-shaped body. The first-stage gear shaft can cover the recessed portion. The raised portion 117 is located at the end positions of both ends of the irregular arc body, and the raised portion 117 has a higher raised height than the raised height of the limiting support ring 114 , the limiting body 115 and the first end surface of the transmission assembly 1 located on the mechanical plate 103 .

[0079] In this embodiment, the position-limiting support structure 113 further includes a foot-picking structure 118. There are at least two foot-picking structures 118, and at least two foot-picking structures 118 are spaced apart and arranged on the position-limiting support ring 114. The foot-picking structures 118 are pressed against the cam plate assembly 2 to prevent loosening, limit position, and reduce vibration and abnormal noise.

[0080] The cam plate assembly 2 is slidably connected to the limiting support structure 113. Specifically, the cam plate assembly 2 is slidably connected to the limiting support ring 114. In this embodiment, the cam plate assembly 2 includes a driving cam plate 4 and a follower cam plate 3. The follower cam plate 3 is mounted on the limiting support ring 114 provided on the first end surface of the mechanical plate 103 and is rotatable relative to the limiting support ring 114. The follower cam plate 3 is provided with an abutment portion along its outer periphery to form an abutment position relative to the locking swing assembly 5 during rotation. The locking swing assembly 5 abuts against the abutment portion at this position. The driving cam plate 4 is mounted on the follower cam plate 3 and is connected to the second-stage gear shaft of the transmission assembly 1. Driven by the second-stage gear shaft of the transmission assembly 1, the driving cam plate 4 can rotate and lift the locking swing assembly 5, separating it from the abutment portion. Simultaneously, the driving cam plate 4 drives the follower cam plate 3 to rotate, forming a separation position relative to the locking swing assembly 5 during rotation.

[0081] Furthermore, in this embodiment, the follower cam plate 3 includes an integrally formed connecting support ring 31, a cam surface 32, a position-limiting connecting groove 33, a switching block 34, and an abutment notch 35. The connecting support ring 31 has a morphology and structure compatible with the position-limiting support ring 114. Specifically, the diameter of the connecting support ring 31 is larger than the diameter of the position-limiting support ring 114, so that the connecting support ring 31 fits over the outer circumferential end surface of the position-limiting support ring 114 and can rotate relative to the position-limiting support ring 114. The cam surface 32 is provided on a portion of the outer circumference of the connecting support ring 31, approximately one-third of the outer circumference of the connecting support ring 31. The cam surface 32 is provided on the outer circumference of the one-third of the outer circumference of the connecting support ring 31. The abutment notch 35 is provided at an end of the outer circumference of the cam surface 32, specifically at the left end of the outer circumference of the cam surface 32. In one example, the abutment notch 35 is recessed in the outer peripheral end face of the cam surface 32, and the number of the abutment notches 35 is three, and they are distributed along the outer peripheral surface of the cam surface 32. The abutment notch 35 is the abutment portion of the follower cam disc 3. The limiting connection groove 33 is recessed in the radial end face of the connecting support ring 31. The radial end face of the connecting support ring 31 faces away from the first end face of the machine. In this embodiment, the radial cross-section of the limiting connection groove 33 is annular and is recessed close to the inner side of the connecting support ring 31. The switching block 34 is set in the limiting connection groove 33. In one example, there is one switching block 34, and the height of the protrusion of the switching block 34 protruding from the limiting connection groove 33 is flush with the radial end face of the connecting support ring 31.

[0082] The driving cam plate 4 is connected to the follower cam plate 3. In this embodiment, the driving cam plate 4 includes an integrally formed support ring body 40, a connecting gear ring, a first cam surface 42, a second cam surface 43, and a boss connecting surface 44. The connecting gear ring protrudes from the first radial end surface of the support ring body 40. The connecting gear ring is generally annular and has a rack located within its inner circumference. The transmission assembly 1 engages with the rack of the connecting gear ring to drive the connecting gear ring to rotate. The first cam surface 42 is provided on a portion of the outer circumference of the support ring body 40. In one embodiment, the portion of the outer circumference of the support ring body 40 is approximately one-third of the outer circumference of the support ring body 40. The second cam surface 43 is provided at the end of the portion of the outer circumference of the first cam surface 42. The second cam surface 43 forms a sloped surface relative to the first cam surface 42 on both sides of the circumferential direction of the support ring body 40. That is, the second cam surface 43 has a first sloped surface and a second sloped surface relative to the first cam surface 42. In one embodiment, the second cam surface 43 protrudes radially beyond the cam surface 32 of the follower cam disc 3, allowing the second cam surface 43 to lift the locking swing assembly 5 when the cam disc 4 is driven to rotate. A boss connection surface 44 protrudes from the second radial end surface of the support ring body 40. In one embodiment, the boss connection surface 44 circumscribes one-third of the support ring body 40, with the two ends of the boss connection surface 44 being a locking end 441 and an unlocking end 442. The boss connection surface 44 has a shape that matches the limiting connection groove 33, allowing it to be snap-fitted into and rotated within the limiting connection groove 33. The second radial end surface faces the follower cam disc 3.

[0083] Based on the structure of the driving cam plate 4, when the webbing is pulled out, the transmission assembly 1 drives the driving cam plate 4 to rotate clockwise by a first angle, and the second cam surface 43 lifts the locking swing assembly 5. At the same time, the locking end 441 of the boss connecting surface 44 contacts (the first side of) the switching block 34, driving the follower cam plate 3 to rotate clockwise through the switching block 34. The cam surface 32 of the follower cam plate 3 rotates and separates from the locking swing assembly 5, causing the locking swing assembly 5 to contact the ratchet assembly 105 and enter a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.

[0084] When the webbing is rewound, the transmission assembly 1 drives the driving cam plate 4 to rotate counterclockwise by a second angle. The second cam surface 43 lifts the locking swing assembly 5. At the same time, the unlocking end 442 of the boss connecting surface 44 contacts (the second side of) the switching block 34, driving the follower cam plate 3 to rotate counterclockwise. The cam surface 32 of the follower cam plate 3 contacts the locking swing assembly 5, separating the locking swing assembly 5 from the ratchet assembly 105 and placing it in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out.

[0085] In this embodiment, the driving cam plate 4 further includes a spring structure 45 disposed on the outer periphery of the support ring body 40 to suppress the follower cam plate 3 and prevent abnormal noise. In one example, two spring structures 45 are provided, and the two spring structures 45 are symmetrically arranged relative to the center of the driving cam plate 4. Of course, in other examples, one or more spring structures 45 may be provided.

[0086] The locking swing assembly 5 is in contact with or separated from the cam plate assembly 2. Specifically, in this embodiment, the locking swing assembly 5 includes: a support column 51, a control rod 52, a torsion spring 53 and a limiting structure 54, wherein the support column 51 is arranged on the periphery of the mechanical plate 103 in a direction perpendicular to the first end face of the mechanical plate 103, and the support column 51 is cylindrical. The control rod 52 is movably connected to the support column 51 and can swing at the notch position on the periphery of the mechanical plate 103. The limiting structure 54 is provided on the control rod 52 and the mechanical plate 103. The torsion spring 53 is connected to the limiting structure 54 and can provide a reset torque to the control rod 52, so that it abuts against the abutment portion of the follower cam plate 3 and contacts the ratchet assembly 105 under the drive of the reset torque.

[0087] Furthermore, in this embodiment, the control lever 52 includes a connecting body 521, an abutting arm 522, a lifting arm 523, and a connecting hole 524. The connecting hole 524 is provided on the connecting body 521 and is oriented perpendicularly to the first end surface of the mechanical plate 103. The support column 51 is inserted into the connecting hole 524, allowing the connecting body 521 to rotate relative to the support column 51. The abutting arm 522 is integrally formed with the connecting body 521. When the connecting body 521 is inserted into the support column 51 through the connecting hole 524, the abutting arm 522 is distributed along the circumference of the mechanical plate 103. The end surface of the abutting arm 522 facing the cam surface 32 of the follower cam plate 3 is provided with a protrusion. The structure and number of the protrusions match the structure of the abutting notches 35 on the outer periphery of the cam surface 32. The protrusions on the abutting arm 522 can engage with the abutting notches 35 on the outer periphery of the cam surface 32. The lifting arm 523 is connected to the abutting arm 522 in a direction perpendicular to the first end surface of the mechanical plate 103 . In one example, the lifting arm 523 and the abutting arm 522 are integrally formed. The lifting arm 523 can contact the second cam surface 43 .

[0088] Correspondingly, when the webbing is pulled out, the second-stage gear shaft of the transmission assembly 1 is meshed with the rack of the connecting gear ring of the driving cam disc 4. After the transmission assembly 1 drives the driving cam disc 4 to rotate clockwise by a first angle, the second cam surface 43 lifts the lifting arm 523 of the control rod 52, and the lifting arm 523 drives the abutment arm 522 to lift, so that the protrusion on the abutment arm 522 is separated from the abutment notch 35 on the outer peripheral edge of the cam surface 32 in the radial direction. At the same time, the locking end 441 of the boss connecting surface 44 contacts (the first side of) the switching block 34, driving the follower cam plate 3 to rotate clockwise via the switching block 34. This causes the cam surface 32 of the follower cam plate 3 to separate from the abutting arm 522 of the control lever 52 as it rotates clockwise in the circumferential direction of the cam surface 32. The abutting arm 522 of the control lever 52 loses its support from the cam surface 32 of the follower cam plate 3, causing the abutting arm 522 of the control lever 52 to contact the ratchet assembly 105 and enter a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.

[0089] When the webbing is rewound, the second-stage gear shaft of the transmission assembly 1 meshes with the rack of the connecting gear ring of the driving cam plate 4. After the transmission assembly 1 drives the driving cam plate 4 to rotate counterclockwise by a second angle, the second cam surface 43 lifts the lifting arm 523 of the control lever 52. The lifting arm 523 drives the abutting arm 522 to rise, causing the protrusion on the abutting arm 522 to separate radially from the abutting notch 35 on the outer circumference of the cam surface 32. At the same time, the unlocking end 442 of the boss connecting surface 44 contacts (the second side of) the switching block 34, driving the follower cam plate 3 to rotate counterclockwise. As the cam surface 32 of the follower cam plate 3 rotates counterclockwise along the circumference of the cam surface 32, it contacts the abutting arm 522 of the control lever 52. The abutting arm 522 of the control lever 52 is supported by the cam surface 32 of the follower cam plate 3, separating the abutting arm 522 of the control lever 52 from the ratchet assembly 105 and entering the unlocked state. And when unlocked, the webbing can be rolled back and pulled out.

[0090] Furthermore, in this embodiment, the limiting structure 54 includes a limiting groove, a first limiting block 541, a second limiting block, and a limiting hole. The limiting groove is provided on the circumferential end surface of the connecting body 521, and the main body of the torsion spring 53 is inserted into the limiting groove. The first limiting block 541 is provided on the lifting arm 523, and the first end of the torsion spring 53 abuts between the abutting arm 522 and the first limiting block 541. The second limiting block is provided on the circumference of the mechanical plate 103, and the limiting hole is provided on the second limiting block. The second end of the torsion spring 53 is inserted into the limiting hole of the second limiting block.

[0091] In this embodiment, a locking member 6 is further included, the connection end of which is connected to the transmission assembly 1. In this embodiment, the locking member 6 includes a locking wire rod, that is, the locking wire rod is composed of a single locking wire rod. The locking wire rod includes an integrally formed annular connecting ring 61 and an L-shaped connecting arm 62. The annular connecting ring 61 serves as the connection end of the locking member 6, and the L-shaped connecting arm 62 serves as the locking end 441 of the locking member 6. The annular connecting ring 61 is fittedly connected to the first connecting gear shaft 11 so as to rotate synchronously with the first connecting gear shaft 11. Specifically, the shape of the annular connecting ring 61 is adapted to the circumferential groove on the first connecting gear shaft 11. The adaption of the shape of the connecting ring 61 to the circumferential groove on the first connecting gear shaft 11 means that the connecting ring 61 can be nested in the circumferential groove, so that the connecting ring 61 can rotate synchronously with the first connecting gear shaft 11 through the circumferential groove. In addition, the nesting arrangement of the connecting ring 61 and the circumferential groove is not fixed, but rather the connecting ring 61 and the circumferential groove can move relative to each other under the action of an external force. The L-shaped connecting arm 62 is arranged relative to the convex gear 110 and can contact or separate from the convex gear 110. Specifically, the L-shaped connecting arm 62 includes a vertical arm 621 and a horizontal arm 622, wherein the vertical arm 621 is distributed along the line connecting the first connecting gear shaft 11 and the convex gear 110, and the horizontal arm 622 is perpendicular to the vertical arm 621, and the distribution direction of the horizontal arm 622 is perpendicular to the rotation direction of the convex gear 110, so that the horizontal arm 622 can be engaged with the rack of the convex gear 110.

[0092] In this embodiment, in order to limit the swing position of the connecting arm 62, a limit stopper 119 is further included. The limit stopper 119 is provided on the mechanical plate 103 and is located on the line connecting the first connecting gear shaft 11 and the convex gear 110. Specifically, in one example, two limit stops 119 are provided, and the two limit stops 119 are distributed along the circumference of the mechanical plate 103, and the locking wire rod is limited in the limit gap between the two limit stops 119. Further, in the accompanying drawings, Figure 10 、 Figure 11 In the figure, the limit stop 119 on the left is referred to as the first limit stop 119, and the limit stop 119 on the right is referred to as the second limit stop 119. The clearance between the first limit stop 119 and the second limit stop 119 represents the swing range of the connecting arm 62 of the locking wire rod. When the transmission assembly 1 rotates in the first direction, the connecting arm 62 of the locking wire rod swings to the first limit stop 119, and the connecting arm 62 separates from the convex gear 110 of the vehicle sensing assembly 106. When the transmission assembly 1 rotates in the second direction, the connecting arm 62 of the locking wire rod swings to the second limit stop 119, and the connecting arm 62 contacts the convex gear 110 of the vehicle sensing assembly 106.

[0093] It should be noted that when the transmission assembly 1 drives the locking wire rod to rotate in the first direction or the second direction respectively, even if the locking wire rod is limited by the two limit blocks 119, the connecting end of the locking wire rod (connecting ring 61) and the circumferential groove can undergo relative movement under the driving force of the transmission assembly 1 when they are nested.

[0094] In one scenario, a seatbelt retractor is mounted on the backrest of a car seat. When the car seat backrest is adjusted, the transmission assembly 1 drives the locking member 6 to separate from the convex gear 110, thereby disengaging from the convex gear 110. When the seatbelt retractor swings with the backrest, the vehicle sensor assembly 106 rotates under the action of the counterweight, allowing the webbing to be pulled out and rewound normally without becoming locked or tightened midway. When the car seat backrest stops adjusting, the locking member 6 contacts the convex gear 110, locking with the convex gear 110 and securing the vehicle sensor assembly 106. At this time, the webbing can be pulled out and rewound normally for a certain distance. At the same time, the vehicle sensor assembly 106, under the inertial force of the vehicle sensor ball 112, can drive the vehicle sensor arm 109, causing the vehicle sensor arm 109 to lock with the ratchet assembly 105, thereby meeting the locking performance requirements.

[0095] In this embodiment, a swing arm 7 is also included. Specifically, the driving cam plate 4 of the cam plate assembly 2 is slidably connected to the limiting support structure 113 and, when rotated to a first position, presses against the swing arm 7, causing the swing arm 7 to separate from the ratchet assembly 105 and enter an unlocked state. Furthermore, when rotated to a second position, the swing arm 7 is released, causing the swing arm 7 to contact the ratchet assembly 105 and enter a locked state. The transmission assembly 1 is connected between the core shaft 101 and the convex gear 110, so that the core shaft 101 drives the convex gear 110 to rotate through the transmission assembly 1. The connecting end of the locking member 6 is connected to the transmission assembly 1, and the locking end 441 of the locking member 6 is disposed opposite the convex gear 110 of the vehicle sensing assembly 106. When the transmission assembly 1 rotates in the first direction, the locking end 441 of the locking member 6 is driven to separate from the convex gear 110 of the vehicle sensing assembly 106, thereby unlocking the vehicle sensing assembly 106. When the transmission assembly 1 rotates in the second direction, the locking end 441 of the locking member 6 is driven to contact the convex gear 110 of the vehicle sensing assembly 106, so that the vehicle sensing assembly 106 is in a locked state, and the webbing can be pulled out or rewound at the rotation angle of the car seat.

[0096] The convex gear 110 rotates to the corresponding first and second positions, disengaging the swing arm 7 from the ratchet assembly 105 to unlock the seat, and engaging the ratchet assembly 105 to lock the seat. When the convex gear 110 rotates to the first position, it presses against the swing arm 7, disabling the sensing ball 112 of the sensing assembly 106. Even after the car seat back is folded down, the retractor can pull the webbing a certain distance before the sensing function comes into play, thereby satisfying the folding function without affecting the various functions of the retractor. In addition, when the transmission assembly 1 rotates in the first direction, the locking member 6 drives the locking end 441 of the locking member 6 to separate from the convex gear 110 of the vehicle sensing assembly 106, so that the vehicle sensing assembly 106 is in an unlocked state; when the transmission assembly 1 rotates in the second direction, the locking end 441 of the locking member 6 is driven to contact the convex gear 110 of the vehicle sensing assembly 106, so that the vehicle sensing assembly 106 is in a locked state, thereby achieving the goal that the seat will not be locked during large-angle adjustment, so that the webbing can be pulled out or retracted normally, thereby ensuring the safety of the passengers.

[0097] The swing arm 7 is movably mounted on the mechanical plate 103 and located to the side of the vehicle sensor housing structure 104. It is driven by the vehicle sensor arm 109 of the vehicle sensor assembly 106 to rotate. The swing arm 7 includes an abutting claw arm 71 and a locking arm 72. The abutting claw arm 71 and the locking arm 72 are respectively positioned toward the convex gear 110. The abutting claw arm 71 can abut against the limiting protrusion, while the locking arm 72 abuts against the wheel assembly. When the webbing is not restraining the person, the webbing does not drive the core shaft 101 to rotate. The limiting protrusion contacts the abutting claw arm 71 of the swing arm 7 to inhibit the swing arm 7 from swinging. At the same time, the counterweight 111 drives the vehicle sensor assembly 106 to rotate through its own gravity, ensuring that the vehicle sensor ball 112 of the vehicle sensor assembly 106 remains horizontal when the retractor body 100 rotates with the car seat, allowing the webbing to be pulled out or rewound at the rotation angle of the car seat. When the webbing is used to restrain the human body, the webbing drives the core shaft 101 to rotate, and the limiting protrusion to rotate to form a swing space relative to the swing arm 7. At the same time, when the vehicle sensing assembly 106 is locked, the vehicle sensing ball 112 has an inertial force and swings through the inertial force, driving the swing arm 7 to swing in the swing space and contact the ratchet assembly 105 to enter the locked state.

[0098] This embodiment enables the joint use of an adult automatic locking retractor and a child emergency locking retractor, making it easier for children and adults to share seat belts and solving the problem that ordinary emergency locking seat belts cannot be installed on flip-up seats.

[0099] The present application provides a seat belt retractor, comprising

[0100] The seat belt retractor provided in this application,

[0101] The present application also provides a car seat, which includes the above-mentioned seat belt retractor. The specific description of the seat belt retractor can be found in the description of the above-mentioned embodiment, and will not be repeated here.

[0102] It should be noted that although several structures, components, or units for realizing related functions are mentioned in the above detailed description, such division is not mandatory. In fact, depending on the specific implementation of the application, the features and functions of two or more structures, components, or units described above can be embodied in one structure, component, or unit. Conversely, the features and functions of one structure, component, or unit described above can be further divided into multiple components, structures, or units for embodiment.

[0103] Furthermore, although the components of the assembly or device of the present application and the arrangement of the components are depicted in a particular order in the drawings, this does not require or imply that the assembly or device must be designed in accordance with the particular components or arrangement of the components, or that all of the components shown must be included to achieve the desired results. Additionally or alternatively, certain components may be omitted, multiple components may be combined into one component to achieve corresponding functions, and / or one component may be decomposed into multiple components to achieve corresponding functions, etc.

[0104] Although the present application is disclosed as above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A seat belt retractor, comprising a retractor body mounted on a car seat, a mechanical plate, a spindle, and a locking cover mounted on the retractor body, a ratchet assembly mounted on the inner side of the mechanical plate, a vehicle sensor assembly mounted in a vehicle sensor housing structure of the mechanical plate, and a counterweight connected to the vehicle sensor assembly, characterized in that: include: Cam plate assembly, transmission assembly and locking swing assembly; The cam plate assembly is provided on the first end surface of the mechanical plate; the first end surface of the mechanical plate is the end surface of the mechanical plate facing the locking cover; The transmission assembly is connected between the core shaft and the cam disc assembly, so that the core shaft drives the cam disc assembly to rotate through the transmission assembly, and the cam disc assembly forms an abutting position and a separation position relative to the locking swing assembly during the rotation process; The locking swing assembly is movably arranged at a notch position of the edge of the mechanical plate, and is swung relative to the abutting position to abut against the cam disc assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state, in which the webbing can be rewound and pulled out; when relative to the separated position, it is swung to separate from the cam disc assembly, so that the locking swing assembly contacts the ratchet assembly to be in a locked state, and in the locked state, the webbing can be rewound and cannot be pulled out; The cam plate assembly includes a driving cam plate and a follower cam plate; The follower cam disc is mounted on a limit support ring provided on the first end surface of the mechanical plate and is rotatable relative to the limit support ring; an abutment portion is provided on the outer periphery of the follower cam disc to form an abutment position relative to the locking swing assembly during rotation, and the locking swing assembly abuts against the abutment portion at the abutment position; The driving cam disc is mounted on the follower cam disc and is connected to the transmission assembly so as to rotate under the drive of the transmission assembly and to lift the locking swing assembly during rotation to separate the locking swing assembly from the abutment portion; at the same time, the driving cam disc drives the follower cam disc to rotate so as to form a separated position relative to the locking swing assembly during the rotation of the follower cam disc.

2. The seat belt retractor according to claim 1, characterized in that: The follower cam plate includes an integrally formed connection support ring, a cam surface, a limit connection groove, a switching block and an abutment notch; The connecting support ring is sleeved on the limiting support ring and can rotate relative to the limiting support ring; The cam surface is arranged on a partial outer periphery of the connecting support ring; The abutment notch is provided at the end portion of the outer peripheral edge of the cam surface; the abutment notch is the abutment portion of the follower cam disc; The limiting connection groove is recessed on the radial end surface of the connection support ring; The switching block is arranged in the limiting connection groove.

3. The seat belt retractor according to claim 2, characterized in that: The driving cam plate includes an integrally formed support ring body, a connecting gear ring, a first cam surface, a second cam surface, and a boss connecting surface; The connecting gear ring is protruding from the first radial end surface of the supporting ring body, the connecting gear ring has a rack provided on the inner ring, and the transmission assembly is connected to the rack of the connecting gear ring; The first cam surface is arranged on a partial outer periphery of the supporting ring body; The second cam surface is provided at an end portion of a partial outer circumference of the first cam surface, and the second cam surface forms a slope surface relative to the first cam surface on both sides of the support ring body in the circumferential direction; in the radial direction, the second cam surface protrudes beyond the cam surface of the follower cam plate, and the second cam surface can lift the locking swing assembly when the driving cam plate rotates; The boss connection surface is protrudingly provided on the second radial end surface of the support ring body, and the boss connection surface is distributed around one-third of the support ring body, and has a locking end and an unlocking end; the boss connection surface is clamped in the limiting connection groove; the second radial end surface faces the follower cam disc; When the webbing is pulled out, the transmission assembly drives the driving cam disc to rotate clockwise by a first angle, and the second cam surface lifts the locking swing assembly. At the same time, the locking end of the boss connecting surface contacts the switching block to drive the cam surface of the follower cam disc to separate from the locking swing assembly, so that the locking swing assembly contacts the ratchet assembly to enter a locked state. In the locked state, the webbing can be rewound but cannot be pulled out. When the webbing is rewound, the transmission assembly drives the driving cam disc to rotate counterclockwise to a second angle, and the second cam surface lifts the locking swing assembly. At the same time, the unlocking end of the boss connecting surface contacts the switching block to drive the cam surface of the follower cam disc to contact the locking swing assembly, so that the locking swing assembly is separated from the ratchet assembly to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out.

4. The seat belt retractor according to claim 3, characterized in that: The driving cam disc further comprises a spring structure, which is arranged on the outer periphery of the supporting ring body and is used to suppress the follower cam disc to prevent abnormal noise.

5. The seat belt retractor according to claim 3, characterized in that: The locking swing assembly includes: a support column, a control rod, a torsion spring and a limiting structure; The support column is arranged on the periphery of the mechanical plate in a direction perpendicular to the first end surface of the mechanical plate; The control rod is movably connected to the support column; The limiting structure is provided on the control rod and the mechanical plate; The torsion spring is connected to the limiting structure and can provide a reset torque to the control rod, so that the control rod abuts against the abutting portion of the follower cam disc and contacts the ratchet assembly under the driving of the reset torque.

6. The seat belt retractor according to claim 5, characterized in that: The control rod comprises: a connecting body, an abutting arm, a lifting arm and a connecting hole; The connecting hole is provided on the connecting body, and the hole direction of the connecting hole is provided in a direction perpendicular to the first end surface of the mechanical plate; the supporting column is sleeved in the connecting hole; The abutment arms are integrally formed with the connecting body, and when the connecting body is sleeved onto the support column through the connecting hole, the abutment arms are distributed along the circumference of the mechanical plate; the protrusions on the abutment arms can engage with the abutment notches on the outer circumference of the cam surface; The lifting arm is connected to the abutting arm along a direction perpendicular to the first end surface of the mechanical plate; and the lifting arm can contact the second cam surface.

7. The seat belt retractor according to claim 6, characterized in that: The limiting structure includes: a limiting groove, a first limiting block, a second limiting block and a limiting hole; The limiting groove is provided on the circumferential end surface of the connecting body, and the main body of the torsion spring is sleeved in the limiting groove; The first limiting block is provided on the lifting arm, and the first end of the torsion spring abuts between the abutting arm and the first limiting block; The second limiting block is arranged on the periphery of the mechanical plate, and the limiting hole is arranged on the second limiting block; the second end of the torsion spring is inserted into the limiting hole of the second limiting block.

8. The seat belt retractor according to claim 3, characterized in that: The transmission assembly includes a first connecting gear shaft, a support pillow block and a second connecting gear shaft; The first connecting gear shaft is connected to the connecting end of the core shaft and is located on the first end surface of the mechanical plate; The support pillow is arranged on the first end surface of the mechanical plate and is located on the side of the center of the mechanical plate; The second connecting gear shaft is movably arranged on the support shaft platform, and the second connecting gear shaft includes a first-stage gear shaft and a second-stage gear shaft. The first-stage gear shaft is meshed with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft is meshed with the rack of the connecting gear ring.

9. A car seat, characterized in that: The invention comprises a seat belt retractor according to any one of claims 1 to 8.

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