Safety belt retractor and automobile seat

Abstract

The invention provides a safety belt retractor and an automobile seat. The safety belt retractor comprises a cam disc assembly, a transmission assembly and a locking swing assembly. The cam disc assembly is arranged on the first end face of the mechanical plate, and the first end face of the mechanical plate is the end face, facing the locking cover cap, of the mechanical plate. The transmission assembly is connected between the mandrel and the cam disc assembly so as to drive the convex fluted disc assembly to rotate through the transmission assembly under driving of the mandrel, and the convex fluted disc assembly forms an abutting position and a separation position relative to the locking swing assembly in the rotating process. The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate and swings at the relative abutting position to abut against the cam disc assembly, so that the locking swing assembly is separated from the ratchet wheel assembly to be in an unlocking state, and in the unlocking state, the braid can be rewound and pulled out; the locking swing assembly swings to be separated from the cam disc assembly when located at the relative separation position, so that the locking swing assembly makes contact with the ratchet wheel assembly to be in a locking state, and in the locking state, the braid can be rewound and cannot be pulled out.

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 one of the indispensable means of transportation for people to travel, and people's requirements for the comfort of cars are getting higher and higher. Among them, seats are one of the important components of the car safety system. Since children's bodies are much smaller than adults, ordinary car seat belts cannot effectively protect children in car seats, and 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, if a collision or other accidents occur while children are riding in a car, children are prone to danger.

[0003] Therefore, the seat belt retractor is required to not only protect adults, but also effectively protect children. When a car collides, the children should be well fixed in the seat to minimize the harm to the children. Summary of the invention

[0004] The present application provides a seat belt retractor to solve the problem in the prior art that, while effectively fixing a child seat, the child protection function and the lock cancellation function can be freely switched to achieve the function of using a seat belt for adults and children, and solve the problem that ordinary emergency locking seat belts cannot be installed on flippable seats. The present application also provides a car seat using the seat belt retractor.

[0005] The present application provides a safety belt retractor, comprising a retractor body arranged on a car seat, a mechanical plate, a spindle and a locking cover arranged on the retractor body, a ratchet assembly arranged on the inner side of the mechanical plate, a vehicle sensing assembly arranged 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 arranged 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 convex tooth plate assembly to rotate through the transmission assembly, and the convex tooth plate assembly forms an abutting 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 to abut against the cam disc assembly when relative to the abutting position, 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 to separate from the cam disc assembly when relative to the separation position, 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 comprises a driving cam plate and a follower cam plate;

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

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

[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 arranged at the end of the outer peripheral edge of the cam surface; the abutment notch is the abutment portion of the follower cam plate;

[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 comprises an integrally formed supporting 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 protrudingly arranged on the first radial end surface of the supporting ring body, the connecting gear ring has a rack arranged 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 arranged at the end of the 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 circumferential direction of the support ring body; in the radial direction, the second cam surface protrudes from the cam surface of the follower cam disc, and the second cam surface can lift the locking swing assembly when the driving cam disc rotates;

[0022] The boss connection surface is protrudingly arranged on the second radial end surface of the support ring body, 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 limit connection groove; the second radial end surface faces the follower cam disc;

[0023] When the webbing is pulled out, after the transmission assembly drives the driving cam disc to rotate clockwise by a first angle, the second cam surface lifts up the locking swing assembly, and 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 be in a locked state. In the locked state, the webbing can be retracted but cannot be pulled out;

[0024] When the webbing is rewound, after the transmission assembly drives the driving cam disc to rotate counterclockwise to a second angle, the second cam surface lifts the locking swing assembly, and 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 plate 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 comprises: 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 board along a direction perpendicular to the first end surface of the mechanical board;

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

[0029] The limiting structure is arranged 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 drive 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 connection hole is arranged on the connection body, and the hole direction of the connection hole is arranged in a direction perpendicular to the first end surface of the mechanical plate; the support column is sleeved in the connection hole;

[0033] The abutment arm is integrally formed with the connection body, and when the connection body is sleeved on the support column through the connection hole, the abutment arm is distributed along the circumference of the mechanical plate; the convex body on the abutment arm can be engaged with the abutment notch 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 comprises: 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 body of the torsion spring is sleeved in the limiting groove;

[0037] The first limit block is arranged on the lifting arm, and the first end of the torsion spring abuts between the abutting arm and the first limit 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 block 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 supporting 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 meshingly connected with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft is meshingly connected with the rack of the connecting gear ring.

[0043] The present application also provides a car seat, which comprises 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 arranged on a car seat, a mechanical plate, a spindle and a locking cover arranged on the retractor body, a ratchet assembly arranged on the inner side of the mechanical plate, a vehicle sensing assembly arranged in a vehicle sensing accommodating structure of the mechanical plate and a counterweight connected to the vehicle sensing assembly, and also comprising: a cam plate assembly, a transmission assembly and a locking swing assembly. The cam plate assembly is arranged on the 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 spindle and the cam plate assembly, so that the convex tooth plate assembly is driven to rotate through the transmission assembly under the drive of the spindle, and the convex tooth plate assembly forms an abutment position and a separation position relative to the locking swing assembly during the rotation process. The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate, and is swung to abut against the cam disc assembly when relative to the abutting position, 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 to separate from the cam disc assembly when relative to the separation position, 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 It is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application.

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

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

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

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

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

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

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

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

[0056] Fig.10 It is a schematic diagram of the structure of the control rod provided in the embodiment of the present application.

[0057] Fig.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] Fig.12 It is a schematic diagram of the unlocked state of the locking member and the convex gear provided in the embodiment of the present application.

[0059] Fig.13 It is a schematic diagram of the state where the convex gear plate provided in the embodiment of the present application abuts against the swing arm.

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

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

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

[0063] Fig.17 It is a schematic diagram of the structure of the mechanical plate provided in the embodiment of the present application.

[0064] Reference numerals:

[0065] Retractor body 100, spindle 101, locking cover 102, mechanical plate 103, vehicle sensing accommodating structure 104, ratchet assembly 105, vehicle sensing assembly 106, vehicle sensing fixing seat 107, vehicle sensing body 108, vehicle sensing arm 109, convex gear 110, counterweight 111, vehicle sensing ball 112, limiting support structure 113, limiting support ring 114, limiting body 115, anti-interference protrusion 116, protrusion 117, foot-picking structure 118, 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, supporting ring 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, supporting 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] Many specific details are described in the following description to facilitate a full 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 connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0067] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and 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 harm to children due to improper wearing. In addition, children are more active than adults. If there is no effective measure to protect children, children are prone to danger if a collision or other accidents occur while riding in a car.

[0070] Based on this, the present application provides a seat belt retractor, including a retractor body arranged on a car seat, a mechanical plate, a spindle and a locking cover arranged on the retractor body, a ratchet assembly arranged on the inner side of the mechanical plate, a vehicle sensing assembly arranged in a vehicle sensing accommodating structure of the mechanical plate and a counterweight connected to the vehicle sensing assembly, and also includes: a cam plate assembly, a transmission assembly and a locking swing assembly. Among them, the cam plate assembly is arranged on the 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 spindle and the cam plate assembly, so that the convex tooth plate assembly is driven to rotate through the transmission assembly under the drive of the spindle, and the convex tooth plate assembly forms an abutment position and a separation position relative to the locking swing assembly during the rotation process. The locking swing assembly is movably arranged at the notch position of the edge of the mechanical plate, and is swung to abut against the cam disc assembly when relative to the abutting position, 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 to separate from the cam disc assembly when relative to the separation position, 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 It is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application. Figure 2 It is a schematic structural diagram of some components of the seat belt retractor provided in an embodiment of the present application. Figure 3 It is a schematic structural diagram of some components of the seat belt retractor provided in an embodiment of the present application. Figure 4 It is an exploded view of a seat belt retractor provided in an embodiment of the present application. Figure 5 It is a stereoscopic diagram of the follower cam plate provided in the embodiment of the present application. Figure 6 It is a cross-sectional view of the follower cam plate provided in the embodiment of the present application. Figure 7 It is a stereoscopic diagram of the driving cam plate provided in the embodiment of the present application. Figure 8 It is a schematic diagram of the structure of the driving cam plate provided in an embodiment of the present application in another direction. Fig. 9 It is a cross-sectional view of the driving cam plate provided in an embodiment of the present application. Fig.10 It is a schematic diagram of the structure of the control rod provided in the embodiment of the present application. Fig.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. Fig.12 It is a schematic diagram of the unlocked state of the locking member and the convex gear provided in the embodiment of the present application. Fig.13 It is a schematic diagram of the state where the convex gear plate provided in the embodiment of the present application abuts against the swing arm. Fig.14 It is a schematic diagram of the structure of the vehicle sensing component provided in an embodiment of the present application. Fig.15 It is a schematic diagram of the structure of the locking member provided in an embodiment of the present application. Fig.16 It is a structural schematic diagram of the transmission assembly and the locking member provided in the embodiment of the present application installed on the mechanical plate. Fig.17 It is a schematic diagram of the structure of the mechanical plate provided in the 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 arranged on a car seat and a mechanical plate 103, a spindle 101 and a locking cover 102 arranged 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 spindle 101 is installed on the bracket assembly, the preload wheel is connected to one end of the spindle 101, the torsion bar is arranged inside the preload wheel, the shaft head is connected to the torsion bar, and the locking block assembly is connected to the shaft head. It also includes a ratchet assembly 105 arranged 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, 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. It also includes a vehicle sensing component 106 disposed in the vehicle sensing accommodation structure 104 of the mechanical plate 103 and a counterweight 111 connected to the vehicle sensing component 106, wherein the vehicle sensing component 106 includes a vehicle sensing fixed seat 107, a vehicle sensing body 108, a vehicle sensing arm 109, a vehicle sensing ball 112 and a convex gear 110, the vehicle sensing fixed seat 107 is installed in the vehicle sensing accommodation structure 104, the vehicle sensing body 108 is installed in the vehicle sensing fixed seat 107, the vehicle sensing ball 112 is accommodated in the vehicle sensing body 108, and the vehicle sensing ball 112 can drive the vehicle sensing arm 109. The convex gear 110 is connected to the vehicle sensing body 108 and rotates synchronously with the vehicle sensing body 108. The counterweight 111 is connected to the vehicle sensing body 108 to drive the vehicle sensing fixed seat 107 to rotate through the self-gravity of the counterweight 111.

[0074] In this embodiment, the seat belt retractor further comprises a cam plate assembly 2, a transmission assembly 1 and a locking swing assembly 5, wherein the cam plate assembly 2 is arranged on the first end surface of the mechanical plate 103, and the first end surface of the mechanical plate 103 is the end surface of the mechanical plate 103 facing the locking cover 102. The transmission assembly 1 is connected between the spindle 101 and the cam plate assembly 2, so that the convex tooth plate assembly is driven by the spindle 101 to rotate through the transmission assembly 1, and the convex tooth plate assembly forms an abutting position and a separation position relative to the locking swing assembly 5 during the rotation process. The locking swing assembly 5 is movably arranged at the notch position of the edge of the mechanical plate 103, and is swung to abut against the cam plate assembly 2 when in the relative abutting position, so that the locking swing assembly 5 is separated from the ratchet assembly 105 to be in an unlocked state, and in the unlocked state, the webbing can be rewound and pulled out. 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, and in the locked state, the webbing can be rewound but cannot be pulled out.

[0075] The specific structure and connection relationship of the above-mentioned components will be further described as follows.

[0076] Specifically, in the present embodiment, the transmission assembly 1 includes a first connecting gear shaft 11, a support shaft platform 12 and a second connecting gear shaft 13. Among them, 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 integrally formed, and the connecting column is located on the side close to the mechanical plate, and the circumferential groove is arranged 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 arranged 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 arranged 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 integrally formed. The second-stage gear shaft is located on the side close to the mechanical version, 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 greater 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 rotates 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 diameter plane, the first-stage gear shaft is meshedly connected with the gear shaft of the first connecting gear shaft 11, and the second-stage gear shaft is meshedly connected with the rack of the connecting gear ring 41.

[0077] In the present 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 limited 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, and the protrusion height of the anti-interference protrusion 116 is higher than the protrusion height 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 protruding portion 117 that are integrally formed, wherein the irregular arc-shaped body is disposed between the first connecting gear shaft 11 and the support shaft platform 12, the recessed portion is located in the middle of the irregular arc-shaped body, and the first-stage gear shaft can be covered in 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 raised height higher than the raised height of the limiting support ring 114 , the limiting body 115 and the first end surface of the transmission assembly 1 disposed on the mechanical plate 103 .

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

[0080] The cam disc assembly 2 is slidably connected to the limiting support structure 113, and specifically, the cam disc assembly 2 is slidably connected to the limiting support ring 114. In this embodiment, the cam disc assembly 2 includes a driving cam disc 4 and a follower cam disc 3. The follower cam disc 3 is mounted on the limiting support ring 114 provided on the first end surface of the mechanical plate 103, and can rotate relative to the limiting support ring 114. An abutment portion is provided on the outer peripheral edge of the follower cam disc 3 to form an abutment position relative to the locking swing assembly 5 during the rotation process, and the locking swing assembly 5 abuts against the abutment portion at the abutment position. The driving cam disc 4 is mounted on the follower cam disc 3 and connected to the second-stage gear shaft of the transmission assembly 1 to rotate under the drive of the second-stage gear shaft of the transmission assembly 1, and can lift the locking swing assembly 5 during the rotation to separate the locking swing assembly 5 from the abutment portion. At the same time, the driving cam disc 4 drives the follower cam disc 3 to rotate, so as to form a separation position relative to the locking swing assembly 5 during the rotation process of the follower cam disc 3.

[0081] Further, in the present embodiment, the follower cam disc 3 includes an integrally formed connection support ring 31, a cam surface 32, a position limiting connection groove 33, a switching block 34 and an abutment notch 35; wherein the connection support ring 31 has a morphological structure adapted to the position limiting support ring 114, specifically, the diameter of the connection support ring 31 is larger than the diameter of the position limiting support ring 114, so that the connection support ring 31 is sleeved on 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 arranged on a partial outer circumference of the connection support ring 31, and the partial outer circumference of the connection support ring 31 is approximately one-third of the outer circumference of the connection support ring 31, and the cam surface 32 is arranged at the outer circumference of one-third of the connection support ring 31. The abutment notch 35 is arranged at the end of the outer circumference of the cam surface 32, and specifically, at the end on the left side of the outer circumference of the cam surface 32. In one example, the abutment notch 35 is recessed in the outer peripheral end surface 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 surface of the connecting support ring 31. The radial end surface of the connecting support ring 31 is away from the first end surface 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 arranged in the limiting connection groove 33. In one example, the switching block 34 is set to one, and the protruding height of the switching block 34 protruding from the limiting connection groove 33 is flush with the radial end surface of the connecting support ring 31.

[0082] The driving cam disc 4 is connected to the follower cam disc 3. In this embodiment, the driving cam disc 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 is protruding from the first radial end surface of the support ring body 40, and the connecting gear ring is in an annular shape as a whole. The connecting gear ring has a rack arranged on the inner ring, and the transmission assembly 1 is meshed and connected with the rack of the connecting gear ring to drive the connecting gear ring to rotate. The first cam surface 42 is arranged on the partial outer periphery of the support ring body 40, wherein in one example, the partial outer periphery of the support ring body 40 is the outer periphery of one-third of the support ring body 40. The second cam surface 43 is arranged at the end of the partial outer periphery of the first cam surface 42, and the second cam surface 43 forms a slope 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 is provided with a first slope surface and a second slope surface relative to the first cam surface 42. In one example, in the radial direction, the second cam surface 43 is arranged to protrude from the cam surface 32 of the follower cam disc 3, so that the second cam surface 43 can lift up the locking swing assembly 5 when the cam disc 4 is driven to rotate. The boss connection surface 44 is protrudingly arranged on the second radial end surface of the support ring body 40. In one example, the boss connection surface 44 is distributed around one-third of the support ring body 40, and the two ends of the boss connection surface 44 are a locking end 441 and an unlocking end 442. The boss connection surface 44 has a shape that is compatible with the limiting connection groove 33, so that the boss connection surface 44 can be clamped in the limiting connection groove 33 and can rotate in 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 disc 4, when the webbing is pulled out, the transmission assembly 1 drives the driving cam disc 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 connection surface 44 contacts the switching block 34 (the first side), so as to drive the follower cam disc 3 to rotate clockwise through the switching block 34, and the cam surface 32 of the follower cam disc 3 rotates and separates from the locking swing assembly 5, 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 and cannot be pulled out.

[0084] When the webbing is rewound, the transmission assembly 1 drives the driving cam disc 4 to rotate counterclockwise by a second angle, and 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) switching block 34 to drive the follower cam disc 3 to rotate counterclockwise, and the cam surface 32 of the follower cam disc 3 contacts the locking swing assembly 5, so that the locking swing assembly 5 is separated from the ratchet assembly 105 to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out.

[0085] In this embodiment, the driving cam disc 4 further includes a spring structure 45, which is arranged on the outer periphery of the supporting ring body 40 and is used to suppress the follower cam disc 3 to 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 disc 4. Of course, in other examples, the spring structure 45 can be provided as one or more than two.

[0086] The locking swing assembly 5 is in contact with or separated from the cam plate assembly 2. Specifically, in the present embodiment, the locking swing assembly 5 comprises: 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 surface 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 arranged 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 can abut against the abutting portion of the follower cam plate 3 under the drive of the reset torque, and contact with the ratchet assembly 105.

[0087] Further, in this embodiment, the control rod 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 the hole of the connecting hole 524 is provided in a direction perpendicular to the first end surface of the mechanical plate 103. The support column 51 is sleeved in the connecting hole 524, so that the connecting body 521 rotates by relying on the support column 51. The abutting arm 522 is integrally formed with the connecting body 521, and when the connecting body 521 is sleeved on the support column 51 through the connecting hole 524, the abutting arm 522 is distributed along the circumference direction of the mechanical plate 103. The end surface of the abutting arm 522 facing the cam surface 32 of the follower cam disc 3 is provided with a convex body, and the structural form and number of the convex body are adapted to the structural form of the abutting notch 35 on the outer circumference of the cam surface 32, and the convex body on the abutting arm 522 can be engaged with the abutting notch 35 on the outer circumference 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 plate 4. After the transmission assembly 1 drives the driving cam plate 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 connection surface 44 contacts the switching block 34 (the first side) to drive the follower cam disc 3 to rotate clockwise through the switching block 34, so that the cam surface 32 of the follower cam disc 3 rotates clockwise in the circumferential direction of the cam surface 32 and separates from the abutment arm 522 of the control rod 52, and the abutment arm 522 of the control rod 52 loses the support of the cam surface 32 of the follower cam disc 3, so that the abutment arm 522 of the control rod 52 contacts the ratchet assembly 105 to be in a locked state. In the locked state, the webbing can be rolled back and cannot be pulled out.

[0089] When the webbing is rewound, 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 counterclockwise by a second angle, the second cam surface 43 lifts the lifting arm 523 of the control rod 52, and the lifting arm 523 drives the abutting arm 522 to lift, so that the convex body on the abutting arm 522 is separated from the abutting notch 35 of the outer peripheral edge of the cam surface 32 in the radial direction. At the same time, the unlocking end 442 of the boss connecting surface 44 contacts the switching block 34 (the second side) to drive the follower cam disc 3 to rotate counterclockwise, and the cam surface 32 of the follower cam disc 3 rotates counterclockwise in the peripheral direction of the cam surface 32 and contacts the abutting arm 522 of the control rod 52, and the abutting arm 522 of the control rod 52 is supported by the cam surface 32 of the follower cam disc 3, so that the abutting arm 522 of the control rod 52 is separated from the ratchet assembly 105 to be in an unlocked state. And when in the unlocked state, 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 body of the torsion spring 53 is sleeved in 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 also included, and the connecting end of the locking member 6 is connected to the transmission assembly 1. In this embodiment, the locking member 6 includes a locking steel wire rod, that is, the locking steel wire rod is composed of a locking steel wire rod. Among them, the locking steel wire rod includes an integrally formed ring-shaped connecting ring 61 and an L-shaped connecting arm 62. The ring-shaped connecting ring 61 is the connecting end of the locking member 6, and the L-shaped connecting arm 62 is the locking end 441 of the locking member 6. The ring-shaped connecting ring 61 is fittedly connected to the first connecting gear shaft 11 to rotate synchronously with the first connecting gear shaft 11. Specifically, the ring shape of the ring-shaped connecting ring 61 is adapted to the circumferential groove on the first connecting gear shaft 11. The ring shape of the connecting ring 61 is adapted to the circumferential groove on the first connecting gear shaft 11, which 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 mode of the connecting ring 61 and the circumferential groove is not fixed, but the connecting ring 61 and the circumferential groove can move relative to each other under the action of external force when they are nested. The L-shaped connecting arm 62 is arranged opposite 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 between the first connecting gear shaft 11 and the convex gear 110, 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 arranged on the mechanical plate 103 and is located on the line between the first connecting gear shaft 11 and the convex gear 110. Specifically, in one example, two limit stops 119 are arranged, and the two limit stops 119 are distributed along the circumference of the mechanical plate 103, and the locking wire rod is limited between the limit gaps between the two limit stops 119. Further, in the accompanying drawings, Fig.10 , Fig.11 In the figure, the limit stopper 119 on the left is called the first limit stopper 119, and the limit stopper 119 on the right is called the second limit stopper 119. The limit gap between the first limit stopper 119 and the second limit stopper 119 is the swing range of the connecting arm 62 of the locking wire rod. When the transmission assembly 1 rotates in the first direction and drives the connecting arm 62 of the locking wire rod to swing to the first limit stopper 119, the connecting arm 62 is separated from the convex gear 110 of the vehicle sensing assembly 106. When the transmission assembly 1 rotates in the second direction and drives the connecting arm 62 of the locking wire rod to swing to the second limit stopper 119, 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 (connecting ring 61) of the locking wire rod 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, the seat belt retractor is installed on the backrest of the car seat. When the backrest of the car seat starts to adjust, the transmission component 1 will drive the locking member 6 to separate from the convex gear 110 to disengage from the convex gear 110. When the seat belt retractor swings with the backrest, the vehicle sensing component 106 rotates under the action of the counterweight, and the webbing can be pulled out and rewound normally, and there will be no locking and tensioning state in the middle. When the backrest of the car seat stops adjusting, the locking member 6 contacts the convex gear 110 to lock with the convex gear 110 to fix the vehicle sensing component 106. At this time, the webbing can still be pulled out and rewound normally for a distance. At the same time, the vehicle sensing component 106 can drive the vehicle sensing arm 109 under the inertial force of the vehicle sensing ball 112, so that the vehicle sensing arm 109 is locked with the ratchet component 105, thereby meeting the locking performance requirements.

[0095] In this embodiment, a swing arm 7 is also included. Specifically, the driving cam disc 4 of the cam disc assembly 2 is slidably connected to the limiting support structure 113, and when it rotates to the first position, it presses the swing arm 7, so that the swing arm 7 is separated from the ratchet assembly 105 to be in an unlocked state. And when it rotates to the second position, the swing arm 7 is released, so that the swing arm 7 contacts with the ratchet assembly 105 to be in a locked state. The transmission assembly 1 is connected between the spindle 101 and the convex gear 110 disk, so that the convex gear 110 disk is driven by the spindle 101 through the transmission assembly 1 to rotate. 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 arranged opposite to the convex gear 110 of the vehicle sensing assembly 106, so that 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, 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, and the webbing can be pulled out or rewound at the rotation angle of the car seat.

[0096] The convex gear 110 is rotated to the corresponding first position and second position, so that the swing arm 7 is separated from the ratchet assembly 105 to be in an unlocked state, and is in contact with the ratchet assembly 105 to be in a locked state. When the convex gear 110 is rotated to the first position, it presses the swing arm 7, and the vehicle sensing ball 112 of the vehicle sensing assembly 106 does not work. Even after the car seat back is folded down, the retractor can pull the webbing out a certain distance before the vehicle sensing works, thereby satisfying the folding function without affecting the various functions of the retractor. In addition, when the transmission assembly 1 rotates in a 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 a 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 a large-angle adjustment process, 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 arranged on the mechanical plate 103 and is located on the side of the vehicle sensing accommodating structure 104, and can be rotated under the drive of the vehicle sensing arm 109 of the vehicle sensing assembly 106. 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 arranged toward the convex gear 110 disk, the abutting claw arm 71 can abut against the limiting protrusion, and the locking arm 72 abuts against the machine wheel assembly. When the webbing does not bind the human body, the webbing does not drive the core shaft 101 to rotate, and 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 sensing assembly 106 to rotate by its own gravity, so that the vehicle sensing ball 112 of the vehicle sensing assembly 106 is always in a horizontal position when the retractor body 100 rotates with the car seat, and the webbing can be pulled out or rewound at the rotation angle of the car seat. When the webbing restrains the human body, the webbing drives the core shaft 101 to rotate, and drives the limiting protrusion to rotate to form a swingable space relative to the swing arm 7. At the same time, the vehicle sensing ball 112 has an inertia force when the vehicle sensing component 106 is locked, and swings through the inertia force to drive the swing arm 7 to swing in the swing space to contact with the ratchet component 105 to be in a locked state.

[0098] This embodiment can realize the common use of the adult automatic locking retractor and the child emergency locking retractor, which is convenient for children and adults to share the safety belt and solves the problem that the ordinary emergency locking safety belt cannot be installed on the flip-over seat.

[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, according to the specific implementation of the present application, the features and functions of two or more structures, components or units described above can be concretized 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 to be concretized.

[0103] In addition, although the components and the installation methods of the components or devices in the present application are described in a specific order in the drawings, this does not require or imply that the components or devices must be designed according to the specific components or the installation methods of the components, or that all the components shown must be included to achieve the desired results. Additionally or alternatively, some components can be omitted, multiple components can be combined into one component to achieve corresponding functions, and / or one component can be decomposed into multiple components to achieve corresponding functions, etc.

[0104] Although the present application is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present application. Any technical personnel in this field 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 arranged on a car seat, a mechanical plate, a spindle and a locking cover arranged on the retractor body, a ratchet assembly arranged on the inner side of the mechanical plate, a vehicle sensing assembly arranged in a vehicle sensing accommodating structure of the mechanical plate and a counterweight connected to the vehicle sensing assembly, characterized in that: include: Cam plate assembly, transmission assembly and locking swing assembly; The cam plate assembly is arranged 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 plate assembly, so that the core shaft drives the convex tooth plate assembly to rotate through the transmission assembly, and the convex tooth plate 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 the notch position of the edge of the mechanical plate, and is swung to abut against the cam disc assembly when relative to the abutting position, 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 to separate from the cam disc assembly when relative to the separation position, 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.

2. The seat belt retractor according to claim 1, characterized in that: The cam plate assembly comprises a driving cam plate and a follower cam plate; The follower cam disc is sleeved on a limit support ring provided on the first end surface of the mechanical plate and can rotate relative to the limit support ring; an abutment portion is provided on the outer circumference of the follower cam disc to form an abutment position relative to the locking swing assembly during the rotation process, and the locking swing assembly abuts against the abutment portion at the abutment position; The driving cam plate is mounted on the follower cam plate and is connected to the transmission assembly so as to rotate under the drive of the transmission assembly and to lift up the locking swing assembly during rotation to separate the locking swing assembly from the abutment portion; at the same time, the driving cam plate drives the follower cam plate to rotate so as to form a separation position relative to the locking swing assembly during the rotation of the follower cam plate.

3. The seat belt retractor according to claim 2, characterized in that: The follower cam plate comprises 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 arranged at the end 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.

4. The seat belt retractor according to claim 3, characterized in that: The driving cam plate comprises an integrally formed supporting ring body, a connecting gear ring, a first cam surface, a second cam surface, and a boss connecting surface; The connecting gear ring is protrudingly arranged on the first radial end surface of the supporting ring body, the connecting gear ring has a rack arranged 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 arranged at the end of the 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 circumferential direction of the support ring body; in the radial direction, the second cam surface protrudes from the cam surface of the follower cam disc, and the second cam surface can lift the locking swing assembly when the driving cam disc rotates; The boss connection surface is protrudingly arranged on the second radial end surface of the support ring body, 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 limit connection groove; the second radial end surface faces the follower cam disc; When the webbing is pulled out, after the transmission assembly drives the driving cam disc to rotate clockwise by a first angle, the second cam surface lifts up the locking swing assembly, and 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 be in a locked state. In the locked state, the webbing can be retracted but cannot be pulled out; When the webbing is rewound, after the transmission assembly drives the driving cam disc to rotate counterclockwise to a second angle, the second cam surface lifts the locking swing assembly, and 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.

5. The seat belt retractor according to claim 4, characterized in that: The driving cam plate also includes a spring sheet 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.

6. The seat belt retractor according to claim 4, characterized in that: The locking swing assembly comprises: a support column, a control rod, a torsion spring and a limiting structure; The support column is arranged on the periphery of the mechanical board along a direction perpendicular to the first end surface of the mechanical board; The control rod is movably connected to the support column; The limiting structure is arranged 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 drive of the reset torque.

7. The seat belt retractor according to claim 6, characterized in that: The control rod comprises: a connecting body, an abutting arm, a lifting arm and a connecting hole; The connection hole is arranged on the connection body, and the hole direction of the connection hole is arranged in a direction perpendicular to the first end surface of the mechanical plate; the support column is sleeved in the connection hole; The abutment arm is integrally formed with the connection body, and when the connection body is sleeved on the support column through the connection hole, the abutment arm is distributed along the circumference of the mechanical plate; the convex body on the abutment arm can be engaged with the abutment notch 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.

8. The seat belt retractor according to claim 7, characterized in that: The limiting structure comprises: 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 body of the torsion spring is sleeved in the limiting groove; The first limit block is arranged on the lifting arm, and the first end of the torsion spring abuts between the abutting arm and the first limit 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.

9. The seat belt retractor according to claim 4, 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 block 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 supporting 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 meshingly connected with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft is meshingly connected with the rack of the connecting gear ring.

10. A car seat, characterized in that: It comprises a seat belt retractor as claimed in any one of claims 1 to 9.

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