Safety belt retractor and automobile seat
By designing the cam disc assembly and locking swing assembly of the seat belt retractor, a child protection locking function is added to the ordinary seat belt, which solves the problem of insufficient child seat belt protection in the existing technology and achieves effective fixation in the event of a car collision.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG SONGYUAN AUTOMOTIVE SAFETY SYST CO LTD
- Filing Date
- 2025-01-10
- Publication Date
- 2026-07-09
AI Technical Summary
Existing car seat belts are ineffective in protecting children, especially in the event of a collision, and can easily cause injury to children. Furthermore, ordinary emergency locking seat belts cannot be used with flip-up seats.
A seatbelt retractor was designed, including a cam disk assembly, a transmission assembly, and a locking swing assembly. By forming abutment and separation positions during the rotation of the cam disk assembly, the child safety locking function can be switched. Combined with a ratchet assembly, the locking and unlocking states of the webbing can be switched.
Without altering the original seatbelt structure, a child safety locking mechanism was added to effectively secure the child seat, reduce injuries during collisions, and save on modification costs.
Smart Images
Figure CN2025071929_09072026_PF_FP_ABST
Abstract
Description
A seatbelt retractor and a car seat
[0001] This application claims priority to Chinese Patent Application No. 202411975360.3, filed on December 30, 2024, entitled "A Seatbelt Retractor and a Car Seat", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of automotive safety technology, specifically to a seat belt retractor and a car seat. Background Technology
[0003] As people's living standards continue to improve, cars have become an indispensable means of transportation, and people's demands for car comfort are also increasing. Among these, car seats are a crucial component of the car safety system. Because children are much smaller than adults, ordinary car seat belts are not effective in protecting them, and improper use can even cause injury. Furthermore, children are more active than adults, and without effective child protection measures, they are more vulnerable to danger in the event of a collision or other accident.
[0004] Therefore, seat belt retractors are required to protect not only adults but also children, securing children securely in their seats during a car collision to minimize injury. Summary of the Invention
[0005] This application provides a seatbelt retractor to solve the problem in the prior art that, while effectively securing a child seat, it also allows for free switching between child protection and locking / unlocking functions, enabling adults and children to share seatbelts. This addresses the issue that ordinary emergency locking seatbelts cannot be used with flip-up seats. This application also provides a car seat using the aforementioned seatbelt retractor.
[0006] This application provides a seat belt retractor, including a retractor body disposed on a car seat, a mechanical plate disposed on the retractor body, a spindle and a locking cover, a ratchet assembly disposed on the inner side of the mechanical plate, a vehicle sensing assembly disposed in a vehicle sensing housing structure of the mechanical plate and a counterweight connected to the vehicle sensing assembly, and further including: a cam plate assembly, a transmission assembly and a locking swing assembly.
[0007] The cam disk assembly is disposed on the first end face of the mechanical plate; the first end face of the mechanical plate is the end face of the mechanical plate facing the locking cover;
[0008] The transmission assembly is connected between the spindle and the cam disk assembly, so that the cam disk assembly is driven to rotate by the spindle through the transmission assembly. During the rotation, the cam disk assembly forms an abutment position and a separation position relative to the locking swing assembly.
[0009] The locking swing assembly is movably disposed at the notch position on the edge of the mechanical plate, and is swung to abut against the cam disk assembly when in the abutment position, thereby separating the locking swing assembly from the ratchet assembly to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out. When in the separated position, it swings to separate from the cam disk assembly, thereby contacting the ratchet assembly to be in a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.
[0010] Optionally, the cam disk assembly includes a drive cam disk and a follower cam disk;
[0011] The follower cam disk is mounted on a limiting support ring located on the first end face of the mechanical plate and can rotate relative to the limiting support ring; the outer periphery of the follower cam disk is provided with an abutment portion 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.
[0012] The drive cam disk is mounted on the follower cam disk and connected to the transmission assembly, so as to rotate under the drive of the transmission assembly. When rotating, it can lift the locking swing assembly to separate the locking swing assembly from the abutting part. At the same time, the drive cam disk drives the follower cam disk to rotate, so as to form a separated position relative to the locking swing assembly during the rotation of the follower cam disk.
[0013] Optionally, the follower cam disk includes an integrally formed connecting support ring, a cam surface, a limiting connecting groove, a switching block, and an abutment notch;
[0014] The connecting support ring is fitted onto the limiting support ring and can rotate relative to the limiting support ring;
[0015] The cam surface is disposed on a local outer periphery of the connecting support ring;
[0016] The abutment notch is provided at the end of the outer periphery of the cam surface; the abutment notch is the abutment part of the follower cam disk;
[0017] The limiting connecting groove is recessed on the radial end face of the connecting support ring;
[0018] The switching stop is disposed in the limiting connection groove.
[0019] Optionally, the drive cam disk includes an integrally formed support ring body, a connecting gear ring, a first cam surface, a second cam surface, and a boss connecting surface;
[0020] The connecting gear ring protrudes from the first radial end face of the support ring body, and the connecting gear ring has a rack on the inner ring. The transmission component is connected to the rack of the connecting gear ring.
[0021] The first cam surface is disposed on a partial outer periphery of the support ring body;
[0022] The second cam surface is disposed at the end of a partial outer periphery of the first cam surface, and the second cam surface forms a ramp 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 from the cam surface of the follower cam disk, and the second cam surface can lift the locking swing assembly when the drive cam disk rotates;
[0023] The boss connecting surface protrudes from the second radial end face of the support ring body, and the boss connecting surface is distributed around one-third of the support ring body, having a locking end and an unlocking end; the boss connecting surface is engaged in the limiting connecting groove; the second radial end face faces the follower cam disk;
[0024] When the webbing is pulled out, the transmission assembly drives the drive cam disk 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, so as to drive the cam surface of the follower cam disk 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 rolled back and cannot be pulled out.
[0025] When the webbing is rewinding, the transmission assembly drives the drive cam disk to rotate counterclockwise by a second angle. The second cam surface then lifts the locking swing assembly. At the same time, the unlocking end of the boss connecting surface contacts the switching block, thereby driving the cam surface of the follower cam disk to contact the locking swing assembly. This causes the locking swing assembly to separate from the ratchet assembly and be in an unlocked state. In the unlocked state, the webbing can be rewinded and pulled out.
[0026] Optionally, the drive cam disk further includes a spring sheet structure, which is disposed on the outer periphery of the support ring body to press down the follower cam disk and prevent abnormal noise.
[0027] Optionally, the locking swing assembly includes: a support column, a control rod, a torsion spring, and a limiting structure;
[0028] The support column is arranged along the periphery of the mechanical plate in a direction perpendicular to the first end face of the mechanical plate;
[0029] The control lever is movably connected to the support column;
[0030] The limiting structure is provided on the control rod and the mechanical plate;
[0031] The torsion spring is connected to the limiting structure and can provide a reset torque to the control lever so that it abuts against the abutment portion of the follower cam disk and contacts the ratchet assembly under the drive of the reset torque.
[0032] Optionally, the control lever includes: a connecting body, an abutting arm, a lifting arm, and a connecting hole;
[0033] The connecting hole is provided on the connecting body, and the hole of the connecting hole is arranged in a direction perpendicular to the first end face of the mechanical plate; the support column is fitted into the connecting hole;
[0034] The abutting arm is integrally formed with the connecting body, and when the connecting body is fitted onto the support column through the connecting hole, the abutting arm is distributed along the circumferential direction of the mechanical plate; the protrusion on the abutting arm can engage with the abutting notch on the outer periphery of the cam surface;
[0035] The lifting arm is connected to the abutting arm in a direction perpendicular to the first end face of the mechanical plate; the lifting arm can contact the second cam surface.
[0036] Optionally, the limiting structure includes: a limiting groove, a first limiting block, a second limiting block, and a limiting hole;
[0037] The limiting groove is provided on the circumferential end face of the connecting body, and the main body of the torsion spring is fitted in the limiting groove;
[0038] The first limiting block is disposed on the lifting arm, and the first end of the torsion spring abuts between the abutting arm and the first limiting block;
[0039] The second limiting block is disposed around the periphery of the mechanical plate, and the limiting hole is disposed on the second limiting block; the second end of the torsion spring is inserted into the limiting hole of the second limiting block.
[0040] Optionally, the transmission assembly includes a first connecting gear shaft, a support shaft platform, and a second connecting gear shaft;
[0041] The first connecting gear shaft is connected to the connecting end of the mandrel and is located on the first end face of the mechanical plate;
[0042] The support shaft platform is disposed on the first end face of the machine plate and is located on the side of the center of the machine plate;
[0043] The second connecting gear shaft is movably mounted on the support shaft platform. The second connecting gear shaft includes a first-stage gear shaft and a second-stage gear shaft. The first-stage gear shaft meshes with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft meshes with the rack of the connecting gear ring.
[0044] This application also provides a car seat, the car seat including the seat belt retractor of any of the above.
[0045] Compared with the prior art, this application has the following advantages:
[0046] This application provides a seatbelt retractor, including a retractor body disposed on a car seat, a mechanical plate disposed on the retractor body, a spindle and a locking cover, a ratchet assembly disposed inside the mechanical plate, a vehicle sensing component disposed in a vehicle sensing housing structure of the mechanical plate, and a counterweight connected to the vehicle sensing component. It also includes a cam disc assembly, a transmission assembly, and a locking swing assembly. The cam disc assembly is disposed on a first end face of the mechanical plate, which faces the locking cover. The transmission assembly connects the spindle and the cam disc assembly, so that the cam disc assembly rotates under the drive of the spindle. During rotation, the cam disc assembly forms an abutment position and a disengagement position relative to the locking swing assembly. The locking swing assembly is movably disposed at the notch position on the edge of the mechanical plate, and is swung to abut against the cam disk assembly when in the abutment position, thereby separating the locking swing assembly from the ratchet assembly to be in an unlocked state, in which the webbing can be rewound and pulled out; when in the separated position, it swings to separate from the cam disk assembly, thereby contacting the ratchet assembly to be in a locked state, and in which the webbing can be rewound and cannot be pulled out.
[0047] The seat belt retractor provided in this application has a compact structure and reasonable design. It can easily connect to an external child safety locking mechanism without changing the original seat belt structure. That is, it adds the function of a child safety locking mechanism to a regular 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. Attached Figure Description
[0048] Figure 1 is a structural schematic diagram of a seat belt retractor provided in an embodiment of this application.
[0049] Figure 2 is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of this application.
[0050] Figure 3 is a structural schematic diagram of some components of the seat belt retractor provided in an embodiment of this application.
[0051] Figure 4 is an exploded view of a seatbelt retractor provided in an embodiment of this application.
[0052] Figure 5 is a perspective view of the follower cam disk provided in the embodiment of this application.
[0053] Figure 6 is a cross-sectional view of the follower cam disk provided in an embodiment of this application.
[0054] Figure 7 is a perspective view of the drive cam disk provided in an embodiment of this application.
[0055] Figure 8 is a schematic diagram of the drive cam disk provided in an embodiment of this application in another direction.
[0056] Figure 9 is a cross-sectional view of the drive cam disk provided in an embodiment of this application.
[0057] Figure 10 is a schematic diagram of the control lever provided in an embodiment of this application.
[0058] Figure 11 is a schematic diagram of the locking state of the locking member and the convex gear provided in the embodiment of this application.
[0059] Figure 12 is a schematic diagram of the state in which the locking member and the convex gear are unlocked according to the embodiment of this application.
[0060] Figure 13 is a schematic diagram of the state in which the convex gear disk and the swing arm abut against each other according to an embodiment of this application.
[0061] Figure 14 is a structural schematic diagram of the vehicle sensing component provided in an embodiment of this application.
[0062] Figure 15 is a structural schematic diagram of the locking member provided in an embodiment of this application.
[0063] Figure 16 is a schematic diagram of the transmission assembly and locking element provided in the embodiment of this application installed on the mechanical plate.
[0064] Figure 17 is a schematic diagram of the structure of the mechanical plate provided in the embodiment of this application.
[0065] Reference numerals: Retractor body 100, spindle 101, locking cover 102, mechanical plate 103, vehicle sensor housing structure 104, ratchet assembly 105, vehicle sensor assembly 106, vehicle sensor mounting base 107, vehicle sensor body 108, vehicle sensor arm 109, convex gear 110, counterweight 111, vehicle sensor ball 112, limiting support structure 113, limiting support ring 114, limiting body 115, anti-interference protrusion 116, protrusion 117, foot clip structure 118, limiting stop block 119, transmission assembly 1, first connecting gear shaft 11, support shaft 12, second connecting gear shaft 13, cam disc assembly 2, follower cam disc 3, connecting support ring 31, convex gear Wheel surface 32, limiting connecting groove 33, switching block 34, abutting notch 35, driving cam disc 4, support 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 sheet 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 part 6, connecting ring 61, connecting arm 62, vertical arm 621, horizontal arm 622, swing arm 7, abutting claw arm 71, locking arm 72. Detailed Implementation
[0066] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.
[0067] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0069] In related technologies, because children's bodies are much smaller than adults, ordinary car seat belts cannot effectively protect children in car seats, and improper wearing can even cause injury to children. Moreover, children are more active than adults, and without an effective measure to protect children, children are easily endangered in the event of a collision or other accident while riding in a car.
[0070] Accordingly, this application provides a seatbelt retractor, including a retractor body disposed on a car seat, a mechanical plate disposed on the retractor body, a spindle and a locking cover, a ratchet assembly disposed inside the mechanical plate, a vehicle sensing component disposed in a vehicle sensing housing structure of the mechanical plate, and a counterweight connected to the vehicle sensing component, and further including: a cam disc assembly, a transmission assembly, and a locking swing assembly. The cam disc assembly is disposed on a first end face of the mechanical plate, which is the end face of the mechanical plate facing the locking cover. The transmission assembly connects the spindle and the cam disc assembly, so that the cam disc assembly is driven to rotate under the drive of the spindle, and the cam disc assembly forms an abutment position and a disengagement position relative to the locking swing assembly during rotation. The locking swing assembly is movably disposed at the notch position on the edge of the mechanical plate, and is swung to abut against the cam disk assembly when in the abutment position, thereby separating the locking swing assembly from the ratchet assembly to be in an unlocked state, in which the webbing can be rewound and pulled out; when in the separated position, it swings to separate from the cam disk assembly, thereby contacting the ratchet assembly to be in a locked state, and in which the webbing can be rewound and cannot be pulled out.
[0071] It can be understood that the seat belt retractor provided in this application has a compact structure and reasonable design. Without changing the original seat belt structure, it can easily connect to an external child safety locking mechanism. That is, it adds the function of a child safety locking mechanism 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] The seatbelt retractor provided in this application will now be described in detail with reference to the accompanying drawings. Figure 1 is a structural schematic diagram of a seatbelt retractor according to an embodiment of this application. Figure 2 is a structural schematic diagram of some components of the seatbelt retractor according to an embodiment of this application. Figure 3 is a structural schematic diagram of some components of the seatbelt retractor according to an embodiment of this application. Figure 4 is an exploded view of a seatbelt retractor according to an embodiment of this application. Figure 5 is a perspective view of a follower cam disc according to an embodiment of this application. Figure 6 is a cross-sectional view of a follower cam disc according to an embodiment of this application. Figure 7 is a perspective view of a drive cam disc according to an embodiment of this application. Figure 8 is a structural schematic diagram of a drive cam disc according to an embodiment of this application from another direction. Figure 9 is a cross-sectional view of a drive cam disc according to an embodiment of this application. Figure 10 is a structural schematic diagram of a control lever according to an embodiment of this application. Figure 11 is a schematic diagram of the locking state of the locking member and the convex gear according to an embodiment of this application. Figure 12 is a schematic diagram of the unlocked state of the locking member and the convex gear according to an embodiment of this application. Figure 13 is a schematic diagram of the state of the convex gear disc abutting against the swing arm according to an embodiment of this application. Figure 14 is a structural schematic diagram of a vehicle sensing component according to an embodiment of this application. Figure 15 is a structural schematic diagram of the locking member provided in an embodiment of this application. Figure 16 is a structural schematic diagram of the transmission assembly and locking member provided in an embodiment of this application mounted on a mechanical plate. Figure 17 is a structural schematic diagram of the mechanical plate provided in an embodiment of this application.
[0073] As shown in Figures 1 to 17, this application provides a seat belt retractor, which includes: a retractor body 100 disposed on a car seat, and a mechanical plate 103, a spindle 101, and a locking cover 102 disposed on the retractor body 100. The retractor body 100 includes a bracket assembly, a preload wheel, a torsion bar, a shaft end, and a locking block assembly. The spindle 101 is mounted on the bracket assembly, the preload wheel is connected to one end of the spindle 101, the torsion bar is disposed inside the preload wheel, the shaft end is connected to the torsion bar, and the locking block assembly is connected to the shaft end. It also includes a ratchet assembly 105 disposed inside the mechanical plate 103. The mechanical plate 103 encapsulates the locking block assembly and the ratchet assembly 105 on a first side of the mechanical plate 103 relative to the bracket assembly, i.e., 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 housing structure 104 of the mechanical plate 103 and a counterweight 111 connected to the vehicle sensing component 106. The vehicle sensing component 106 includes a vehicle sensing mounting base 107, a vehicle sensing body 108, a vehicle sensing arm 109, a vehicle sensing ball 112, and a convex gear 110. The vehicle sensing mounting base 107 is installed in the vehicle sensing housing structure 104, the vehicle sensing body 108 is installed in the vehicle sensing mounting base 107, and the vehicle sensing ball 112 is housed in the vehicle sensing body 108, driving the vehicle sensing arm 109. The convex gear 110 is connected to the vehicle sensing body 108 and rotates synchronously with it. The counterweight 111 is connected to the vehicle sensing body 108 so that its own weight drives the vehicle sensing mounting base 107 to rotate.
[0074] In this embodiment, the seatbelt retractor further includes a cam disc assembly 2, a transmission assembly 1, and a locking swing assembly 5. The cam disc assembly 2 is located on the first end face of the mechanical plate 103, which faces the locking cover 102. The transmission assembly 1 connects the spindle 101 and the cam disc assembly 2, driving the toothed disc assembly to rotate under the influence of the spindle 101. During rotation, the toothed disc assembly forms an abutment position and a separation position relative to the locking swing assembly 5. The locking swing assembly 5 is movably positioned at a notch on the edge of the mechanical plate 103 and swings to abut against the cam disc assembly 2 in the abutment position, separating the locking swing assembly 5 from the ratchet assembly 105 to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out. When in a relatively separated position, it swings to separate from the cam disk 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 rolled back and 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 spindle 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 post, a gear shaft, and a circumferential groove. The connecting post and the gear shaft are coaxially integrally formed, with the connecting post located on the side closer to the mechanical plate. The circumferential groove is located on the circumferential end face of the connecting post. The first connecting hole passes through the connecting post and the gear shaft. The connecting end of the spindle 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 located on the first end face of the mechanical plate 103 and is situated 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 coaxially and integrally formed. The second-stage gear shaft is located on the side closer to the mechanical plate. The second connecting hole 524 passes through both the first-stage and second-stage gear shafts. The diameter of the first-stage gear shaft is larger than that of the second-stage gear shaft. The support column 51 of the support shaft platform 12 is connected to the second connecting hole 524, allowing the second connecting gear shaft 13 to 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 meshes with the gear shaft of the first connecting gear shaft 11, and the second-stage gear shaft meshes with the rack of the connecting gear ring 41.
[0077] In this embodiment, a limiting support structure 113 is also provided, wherein the limiting support structure 113 is disposed 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 disposed around the center of the mechanical plate 103 on the first end face of the mechanical plate 103, and the limiting support ring 114 is circular. The limiting body 115 is disposed on the first end face of the mechanical plate 103 and is located outside the limiting support ring 114. In one example, a portion of the limiting body 115 is set as an arc. The cam disk 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 limiting support structure 113 further includes an anti-interference protrusion 116. The anti-interference protrusion 116 is disposed on the first end face of the mechanical plate 103, and the protrusion height of the anti-interference protrusion 116 is higher than the protrusion height of the limiting support ring 114, the limiting body 115, and the transmission assembly 1 disposed on the first end face 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 disk assembly 2, and the locking member 6. In one example, the anti-interference protrusion 116 includes an integrally formed irregular arc-shaped body, a recess, and a protrusion 117. The irregular arc-shaped body is disposed between the first connecting gear shaft 11 and the support shaft platform 12, and the recess is located in the middle of the irregular arc-shaped body. The first-stage gear shaft can cover the recess. The protrusion 117 is located at the ends of both ends of the irregular arc-shaped body, and the protrusion height of the protrusion 117 is higher than the protrusion height of the limiting support ring 114, the limiting body 115 and the transmission assembly 1 on the first end face of the mechanical plate 103.
[0079] In this embodiment, the limiting support structure 113 further includes a latching structure 118. At least two latching structures 118 are provided, and these two latching structures 118 are spaced apart on the limiting support ring 114. The latching structures 118 are pressed against the cam disk assembly 2, preventing loosening and providing a limiting function, while also reducing vibration and abnormal noise.
[0080] The cam disk assembly 2 is slidably connected to the limiting support structure 113, specifically, the cam disk assembly 2 is slidably connected to the limiting support ring 114. In this embodiment, the cam disk assembly 2 includes a driving cam disk 4 and a follower cam disk 3. The follower cam disk 3 is fitted onto the limiting support ring 114 located on the first end face of the mechanical plate 103 and can rotate relative to the limiting support ring 114. The outer periphery of the follower cam disk 3 is provided with an abutment portion to form an abutment position relative to the locking swing assembly 5 during rotation, and the locking swing assembly 5 abuts against the abutment portion at the abutment position. The driving cam disk 4 is fitted onto the follower cam disk 3 and is connected to the second stage gear shaft of the transmission assembly 1, so as 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 rotation to separate the locking swing assembly 5 from the abutment portion. At the same time, the driving cam disk 4 drives the follower cam disk 3 to rotate, so as to form a separation position relative to the locking swing assembly 5 during the rotation of the follower cam disk 3.
[0081] Furthermore, in this embodiment, the follower cam disk 3 includes an integrally formed connecting support ring 31, a cam surface 32, a limiting connecting groove 33, a switching stop 34, and an abutment notch 35. The connecting support ring 31 has a shape and structure adapted to the limiting support ring 114. Specifically, the diameter of the connecting support ring 31 is larger than the diameter of the limiting support ring 114, so that the connecting support ring 31 fits onto the outer circumferential end face of the limiting support ring 114 and can rotate relative to the limiting support ring 114. The cam surface 32 is disposed on a partial outer periphery of the connecting support ring 31, which is approximately one-third of the outer periphery of the connecting support ring 31. The abutment notch 35 is disposed at the end of the outer periphery of the cam surface 32, specifically at the left end of the outer periphery of the cam surface 32. In one example, three abutment notches 35 are recessed on the outer peripheral end face of the cam surface 32 and are distributed along the outer peripheral surface of the cam surface 32. The abutment notches 35 are the abutment portions of the follower cam disk 3. A limiting connecting groove 33 is recessed on the radial end face of the connecting support ring 31. The radial end face of the connecting support ring 31 is away from the first end face of the machine. In this embodiment, the radial cross-section of the limiting connecting groove 33 is annular and recessed close to the inner side of the connecting support ring 31. A switching block 34 is disposed in the limiting connecting groove 33. In one example, there is one switching block 34, and the protrusion height of the switching block 34 from the limiting connecting groove 33 is flush with the radial end face of the connecting support ring 31.
[0082] The driving cam disk 4 is connected to the follower cam disk 3. In this embodiment, the driving cam disk 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 face of the support ring body 40. The connecting gear ring is circular in shape and has a rack on its inner ring. The transmission assembly 1 meshes with the rack of the connecting gear ring to drive the connecting gear ring to rotate. The first cam surface 42 is located on a partial outer periphery of the support ring body 40. In one example, the partial outer periphery of the support ring body 40 is one-third of the outer periphery of the support ring body 40. The second cam surface 43 is located at the end of the partial outer periphery of the first cam surface 42, and the second cam surface 43 forms a ramp surface relative to the first cam surface 42 on both sides of the support ring body 40 in the circumferential direction. That is, the second cam surface 43 has a first ramp surface and a second ramp surface relative to the first cam surface 42. In one example, in the radial direction, the second cam surface 43 protrudes from the cam surface 32 of the follower cam disk 3, so that the second cam surface 43 can lift the locking swing assembly 5 when the cam disk 4 is driven to rotate. A boss connecting surface 44 protrudes from the second radial end face of the support ring body 40. In one example, the boss connecting surface 44 surrounds one-third of the support ring body 40, and its two ends are a locking end 441 and an unlocking end 442. The boss connecting surface 44 has a shape adapted to the limiting connecting groove 33, so that the boss connecting surface 44 can be engaged in the limiting connecting groove 33 and can rotate within the limiting connecting groove 33. The second radial end face faces the follower cam disk 3.
[0083] Based on the structure of the drive cam disk 4, when the webbing is pulled out, the transmission component 1 drives the drive cam disk 4 to rotate clockwise by a first angle. The second cam surface 43 then lifts the locking swing component 5. Simultaneously, the locking end 441 of the boss connecting surface 44 contacts the switching block 34 (first side), causing the follower cam disk 3 to rotate clockwise via the switching block 34. The cam surface 32 of the follower cam disk 3 rotates and separates from the locking swing component 5, causing the locking swing component 5 to contact the ratchet assembly 105 and be in a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.
[0084] When the webbing is rewinding, the transmission assembly 1 drives the drive cam disk 4 to rotate counterclockwise by a second angle. The second cam surface 43 then lifts the locking swing assembly 5. Simultaneously, the unlocking end 442 of the boss connecting surface 44 contacts the switching stop 34 (the second side), causing the follower cam disk 3 to rotate counterclockwise. The cam surface 32 of the follower cam disk 3 then contacts the locking swing assembly 5, separating the locking swing assembly 5 from the ratchet assembly 105 to be in the unlocked state. In the unlocked state, the webbing can be rewinded and pulled out.
[0085] In this embodiment, the drive cam disk 4 further includes a spring structure 45, which is disposed on the outer periphery of the support ring body 40 and is used to press down the follower cam disk 3 to prevent abnormal noise. In one example, two spring structures 45 are provided, and the two spring structures 45 are symmetrically arranged with respect to the center of the drive cam disk 4. Of course, in other examples, one or more spring structures 45 can be provided.
[0086] The locking swing assembly 5 abuts against or separates from the cam disk 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. The support column 51 is arranged along 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 a 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 abuts against the abutment part of the follower cam disk 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 disposed on the connecting body 521, and the hole of the connecting hole 524 is oriented along the first end face of the vertical mechanical plate 103. A support column 51 is fitted 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, and when the connecting body 521 is fitted onto the support column 51 through the connecting hole 524, the abutting arm 522 is distributed along the circumferential direction of the mechanical plate 103. The abutting arm 522 has a protrusion on its end face facing the cam surface 32 of the follower cam disk 3. The structure and number of this protrusion are adapted to the structure of the abutting notch 35 on the outer periphery of the cam surface 32, and the protrusion on the abutting arm 522 can engage with the abutting notch 35 on the outer periphery of the cam surface 32. The lifting arm 523 is connected to the abutment arm 522 along the direction of the first end face of the vertical mechanical plate 103. In one example, the lifting arm 523 and the abutment 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 component 1 meshes with the rack of the connecting gear ring of the drive cam disk 4. After the transmission component 1 drives the drive cam disk 4 to rotate clockwise by a first angle, the second cam surface 43 lifts the lifting arm 523 of the control rod 52. The lifting arm 523 drives the abutment arm 522 to rise, so that the protrusion on the abutment arm 522 separates from the abutment notch 35 on the outer periphery of the cam surface 32 in the radial direction. Simultaneously, the locking end 441 of the boss connecting surface 44 contacts the switching block 34 (first side), so that the switching block 34 drives the follower cam disk 3 to rotate clockwise, causing the cam surface 32 of the follower cam disk 3 to separate from the abutment arm 522 of the control lever 52 when rotating clockwise in the circumferential direction of the cam surface 32. The abutment arm 522 of the control lever 52 loses the support of the cam surface 32 of the follower cam disk 3, so that the abutment arm 522 of the control lever 52 contacts the ratchet assembly 105 to be in a locked state. In the locked state, the webbing can be rolled back but cannot be pulled out.
[0089] When the webbing is rewinding, the second-stage gear shaft of the transmission assembly 1 meshes with the rack of the connecting gear ring of the drive cam disk 4. After the transmission assembly 1 drives the drive cam disk 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 abutment arm 522 to rise, so that the protrusion on the abutment arm 522 separates from the abutment notch 35 on the outer periphery 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 (second side) to drive the follower cam disk 3 to rotate counterclockwise. When the cam surface 32 of the follower cam disk 3 rotates counterclockwise in the circumferential direction of the cam surface 32, it contacts the abutment arm 522 of the control lever 52. The abutment arm 522 of the control lever 52 is supported by the cam surface 32 of the follower cam disk 3, so that the abutment arm 522 of the control lever 52 separates from the ratchet assembly 105 and is in the unlocked state. Furthermore, 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 located on the circumferential end face of the connecting body 521, and the main body of the torsion spring 53 is fitted into the limiting groove. The first limiting block 541 is disposed on the lifting arm 523, and the first end of the torsion spring 53 abuts against the abutting arm 522 and the first limiting block 541. The second limiting block is disposed on the periphery of the mechanical plate 103, and the limiting hole is disposed 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. 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 single locking steel wire rod. The locking steel wire rod includes an integrally formed circular connecting ring 61 and an L-shaped connecting arm 62. The circular 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 circular connecting ring 61 is fitted and connected to the first connecting gear shaft 11 to rotate synchronously with the first connecting gear shaft 11. Specifically, the shape of the circular connecting ring 61 is adapted to the circumferential groove on the first connecting gear shaft 11. The adaptation of the circular 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. Furthermore, the nesting method between the connecting ring 61 and the circumferential groove is not fixed; rather, the connecting ring 61 and the circumferential groove can move relative to each other under the action of external force. 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. The vertical arm 621 is distributed along the line connecting 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 engage with the rack of the convex gear 110.
[0092] In this embodiment, to limit the swing position of the connecting arm 62, a limiting block 119 is also included. The limiting block 119 is disposed on the mechanical plate 103 and located on the line connecting the first connecting gear shaft 11 and the convex gear 110. Specifically, in one example, two limiting blocks 119 are provided, and the two limiting blocks 119 are distributed circumferentially along the mechanical plate 103, limiting the locking wire rod within the limiting gap between the two limiting blocks 119. Furthermore, in Figures 10 and 11, the limiting block 119 located on the left is referred to as the first limiting block 119, and the limiting block 119 located on the right is referred to as the second limiting block 119. The limiting gap between the first limiting block 119 and the second limiting block 119 is the swing range of the connecting arm 62 that locks the wire rod. When the transmission assembly 1 rotates in the first direction, it causes the connecting arm 62 of the locking wire rod to swing to the first limit stop 119, at which point 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, it causes the connecting arm 62 of the locking wire rod to swing to the second limit stop 119, at which point 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 or 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 move relative to each other under the driving force of the transmission assembly 1.
[0094] In one scenario, the seatbelt retractor is installed on the back of a car seat. When the car seat backrest is adjusted, the transmission assembly 1 drives the locking member 6 to disengage from the convex gear 110. As the seatbelt retractor swings with the backrest, the vehicle sensing assembly 106 rotates under the action of the counterweight, allowing the webbing to be pulled out and retracted normally without locking or tightening. When the car seat backrest stops adjusting, the locking member 6 contacts the convex gear 110 to lock it, fixing the vehicle sensing assembly 106. At this time, the webbing can still be pulled out and retracted a certain distance normally. Simultaneously, under the inertial force of the vehicle sensing ball 112, the vehicle sensing assembly 106 can drive the vehicle sensing arm 109, causing the vehicle sensing arm 109 to lock with the ratchet assembly 105, thus meeting the locking performance requirements.
[0095] In this embodiment, a swing arm 7 is also included. Specifically, the drive cam disk 4 of the cam disk assembly 2 slides on the limiting support structure 113 and presses against the swing arm 7 when rotated to the first position, causing the swing arm 7 to separate from the ratchet assembly 105 to be in an unlocked state. And when rotated to the second position, the swing arm 7 is released, causing the swing arm 7 to contact 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 to rotate by the spindle 101 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 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, it causes the locking end 441 of the locking member 6 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 rolled back under the rotation angle of the car seat.
[0096] The convex gear 110 rotates to the corresponding first and second positions, causing the swing arm 7 to separate from the ratchet assembly 105 to be in an unlocked state, and to contact the ratchet assembly 105 to be in a locked state. When the convex gear 110 rotates to the first position, it presses against the swing arm 7, and the vehicle sensing ball 112 of the vehicle sensing assembly 106 is inactive. Even after the car seat back is folded down, the retractor can pull the webbing a certain distance before the vehicle sensing function activates, thus fulfilling the folding function without affecting the retractor's other functions. In addition, 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 the 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 the locked state. This ensures that the seat will not lock during large-angle adjustment, allowing the webbing to be pulled out or retracted normally, thereby ensuring passenger safety.
[0097] The swing arm 7 is movably mounted on the mechanical plate 103 and located on the side of the vehicle sensing housing structure 104. It can rotate 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 positioned towards the convex gear 110 disc. The abutting claw arm 71 can abut against the limiting protrusion, and the locking arm 72 abuts against the wheel assembly. When the webbing is not restraining the human body, the webbing does not drive the spindle 101 to rotate. The limiting protrusion contacts the abutting claw arm 71 of the swing arm 7 to suppress the swing arm 7 from swinging. At the same time, the counterweight 111 drives the vehicle sensing assembly 106 to rotate by its own weight, 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 so that the webbing can be pulled out or rolled back under the rotation angle of the car seat. When the webbing binds the human body, the webbing drives the spindle 101 to rotate, and drives the limiting protrusion to rotate so as to form a swingable space relative to the swing arm 7. At the same time, the vehicle sensing ball 112 has inertial force when the vehicle sensing component 106 is locked, and swings through the inertial force to drive the swing arm 7 to swing in the swing space to contact the ratchet component 105 to be in a locked state.
[0098] This embodiment enables the combined use of an adult automatic locking retractor and a child emergency locking retractor, facilitating the sharing of seat belts between children and adults, and solving the problem that ordinary emergency locking seat belts cannot be installed on flip-up seats.
[0099] This application also provides a car seat, which includes the above-described seat belt retractor. For a detailed description of the seat belt retractor, please refer to the description of the above embodiments, which will not be repeated here.
[0100] It should be noted that although several structures, components, or units for implementing the relevant functions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the specific embodiments of this 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 and embodied by multiple components, structures, or units.
[0101] Furthermore, although the various components of the components or apparatus in this application and the mounting arrangements between them are described in a specific order in the accompanying drawings, this does not require or imply that the components or apparatus must be designed according to that specific component or mounting arrangement, or that all the components shown must be included to achieve the desired result. Additional or alternative components may be omitted, multiple components may be combined into one component to achieve the corresponding function, and / or a component may be decomposed into multiple components to achieve the corresponding function, etc.
[0102] Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.
Claims
1. A seatbelt retractor, comprising a retractor body disposed on a car seat, a mechanical plate disposed on the retractor body, a spindle and a locking cover, a ratchet assembly disposed inside the mechanical plate, a vehicle sensing component disposed in a vehicle sensing housing structure of the mechanical plate, and a counterweight connected to the vehicle sensing component, characterized in that, include: Cam plate assembly, transmission assembly and locking swing assembly; The cam disk assembly is disposed on the first end face of the mechanical plate; 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 disk assembly, so that the cam disk assembly is driven to rotate by the spindle through the transmission assembly. During the rotation, the cam disk assembly forms an abutment position and a separation position relative to the locking swing assembly. The locking swing assembly is movably disposed at the notch position on the edge of the mechanical plate, and is swung to abut against the cam disk assembly when in the abutment position, thereby separating the locking swing assembly from the ratchet assembly to be in an unlocked state. In the unlocked state, the webbing can be rewound and pulled out. When in the separated position, it swings to separate from the cam disk assembly, thereby contacting the ratchet assembly to be in a locked state. In the locked state, the webbing can be rewound but cannot be pulled out.
2. The seatbelt retractor according to claim 1, characterized in that, The cam disk assembly includes a drive cam disk and a follower cam disk; The follower cam disk is mounted on a limiting support ring located on the first end face of the mechanical plate and can rotate relative to the limiting support ring; the outer periphery of the follower cam disk is provided with an abutment portion 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 drive cam disk is mounted on the follower cam disk and connected to the transmission assembly, so as to rotate under the drive of the transmission assembly. When rotating, it can lift the locking swing assembly to separate the locking swing assembly from the abutting part. At the same time, the drive cam disk drives the follower cam disk to rotate, so as to form a separated position relative to the locking swing assembly during the rotation of the follower cam disk.
3. The seatbelt retractor according to claim 2, characterized in that, The follower cam disk includes an integrally formed connecting support ring, cam surface, limiting connecting groove, switching block and abutment notch; The connecting support ring is fitted onto the limiting support ring and can rotate relative to the limiting support ring; The cam surface is disposed on a local outer periphery of the connecting support ring; The abutment notch is provided at the end of the outer periphery of the cam surface; the abutment notch is the abutment part of the follower cam disk; The limiting connecting groove is recessed on the radial end face of the connecting support ring; The switching stop is disposed in the limiting connection groove.
4. The seatbelt retractor according to claim 3, characterized in that, The drive cam disk 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 protrudes from the first radial end face of the support ring body, and the connecting gear ring has a rack on the inner ring. The transmission component is connected to the rack of the connecting gear ring. The first cam surface is disposed on a partial outer periphery of the support ring body; The second cam surface is disposed at the end of a partial outer periphery of the first cam surface, and the second cam surface forms a ramp 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 from the cam surface of the follower cam disk, and the second cam surface can lift the locking swing assembly when the drive cam disk rotates; The boss connecting surface protrudes from the second radial end face of the support ring body, and the boss connecting surface is distributed around one-third of the support ring body, having a locking end and an unlocking end; the boss connecting surface is engaged in the limiting connecting groove; the second radial end face faces the follower cam disk; When the webbing is pulled out, the transmission assembly drives the drive cam disk 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, so as to drive the cam surface of the follower cam disk 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 rolled back and cannot be pulled out. When the webbing is rewinding, the transmission assembly drives the drive cam disk to rotate counterclockwise by a second angle. The second cam surface then lifts the locking swing assembly. At the same time, the unlocking end of the boss connecting surface contacts the switching block, thereby driving the cam surface of the follower cam disk to contact the locking swing assembly. This causes the locking swing assembly to separate from the ratchet assembly and be in an unlocked state. In the unlocked state, the webbing can be rewinded and pulled out.
5. The seatbelt retractor according to claim 4, characterized in that, The drive cam disk also includes a spring sheet structure, which is disposed on the outer periphery of the support ring body and is used to press the follower cam disk to prevent abnormal noise.
6. The seatbelt retractor according to claim 4, 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 along the periphery of the mechanical plate in a direction perpendicular to the first end face of the mechanical plate; The control lever 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 lever so that it abuts against the abutment portion of the follower cam disk and contacts the ratchet assembly under the drive of the reset torque.
7. The seatbelt retractor according to claim 6, characterized in that, The control rod includes: 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 of the connecting hole is arranged in a direction perpendicular to the first end face of the mechanical plate; the support column is fitted into the connecting hole; The abutting arm is integrally formed with the connecting body, and when the connecting body is fitted onto the support column through the connecting hole, the abutting arm is distributed along the circumferential direction of the mechanical plate; the protrusion on the abutting arm can engage with the abutting notch on the outer periphery of the cam surface; The lifting arm is connected to the abutment arm in a direction perpendicular to the first end face of the mechanical plate; the lifting arm can contact the second cam surface.
8. The seatbelt retractor according to claim 7, 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 face of the connecting body, and the main body of the torsion spring is fitted in the limiting groove; The first limiting block is disposed 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 disposed around the periphery of the mechanical plate, and the limiting hole is disposed 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 seatbelt retractor according to claim 4, characterized in that, The transmission assembly includes a first connecting gear shaft, a support shaft platform, and a second connecting gear shaft. The first connecting gear shaft is connected to the connecting end of the mandrel and is located on the first end face of the mechanical plate; The support shaft platform is disposed on the first end face of the machine plate and is located on the side of the center of the machine plate; The second connecting gear shaft is movably mounted on the support shaft platform. The second connecting gear shaft includes a first-stage gear shaft and a second-stage gear shaft. The first-stage gear shaft meshes with the gear shaft of the first connecting gear shaft, and the second-stage gear shaft meshes with the rack of the connecting gear ring.
10. A car seat, characterized in that, Includes the seatbelt retractor as described in any one of claims 1-9.