Front-end anti-locking device, safety belt retractor and automobile seat

Abstract

The utility model provides a front-end anti-locking device, a safety belt retractor and an automobile seat. The front-end anti-locking device comprises a limiting supporting structure, a convex gear disc and a swing arm. The limiting supporting structure is arranged on the first end face of the mechanical plate. The first end face of the mechanical plate is the end face, facing the locking cover cap, of the mechanical plate. The swing arm is movably arranged on the mechanical plate and located on the side of the vehicle sensing containing structure and can be driven by a vehicle sensing arm of the vehicle sensing assembly to rotate. The convex gear disc is connected to the limiting supporting structure in a sliding mode and abuts against the swing arm when rotating to the first position, so that the swing arm is separated from the ratchet wheel assembly to be in an unlocking state. And when rotating to the second position, the swing arm is released, so that the swing arm is in contact with the ratchet wheel assembly to be in a locking state.

Description

Technical Field

[0001] The present application relates to the field of automobile safety technology, and in particular to a front-end anti-locking device, as well as a seat belt retractor and a car seat. Background Art

[0002] With the continuous improvement of people's living standards, cars have become an indispensable means of transportation, and people's demand for car comfort is also increasing. Seats are a key component of the vehicle's safety system. Currently, some vehicle seats feature zero-gravity seating, wide-angle adjustment, and even full reclining. However, existing zero-gravity seats are prone to locking their seatbelt retractors during wide-angle adjustment, making it difficult to extend or retract the seatbelt, impacting passenger safety.

[0003] Therefore, there is an urgent need for a seat belt retractor that can prevent the seat belt retractor from being directly locked during a large-angle seat adjustment process, causing the webbing to be difficult to pull out or directly stuck. Utility Model Content

[0004] This application provides a front-end anti-locking device to address the prior art technical problem of preventing the seatbelt retractor from locking during wide-angle seat adjustment, which can lead to difficulty in pulling out the webbing or causing it to become stuck. This application also provides a seatbelt retractor utilizing the front-end anti-locking device. This application also provides a vehicle seat utilizing the seatbelt retractor.

[0005] The present application provides a front-end anti-locking device installed on a seat belt retractor, wherein the seat belt retractor includes a retractor body provided on a car seat, a mechanical plate provided on the retractor body, a core shaft and a locking cover, a ratchet assembly provided on the inner side of the mechanical plate, a vehicle sensing assembly provided in a vehicle sensing accommodation structure of the mechanical plate, and a drive connection assembly connected to the core shaft, and further includes: a position limiting support structure, a convex gear plate and a swing arm;

[0006] The position-limiting support structure is provided on the first end surface of the mechanical plate; the first end surface of the mechanical plate is the end surface of the mechanical plate facing the locking cover;

[0007] The swing arm is movably arranged on the mechanical plate and is located on the side of the vehicle sensing accommodating structure, and can be rotated under the driving of the vehicle sensing arm of the vehicle sensing assembly;

[0008] The convex gear plate is slidably connected to the limiting support structure, and when rotated to a first position, presses against the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when rotated to a second position, releases the swing arm, so that the swing arm contacts the ratchet assembly to be in a locked state.

[0009] Optionally, the position-limiting support structure includes: a support position-limiting ring and a position-limiting body;

[0010] The support limiting ring surrounds the center of the mechanical plate and is arranged on the first end surface of the mechanical plate;

[0011] The limiting body is arranged on the first end surface of the mechanical plate and is located outside the supporting limiting ring;

[0012] The convex gear plate is slidably connected to the support limiting ring and is confined between the support limiting ring and the limiting body.

[0013] Optionally, the limiting support structure also includes: an anti-interference protrusion, which is arranged on the first end surface of the mechanical plate, and the protrusion height of the anti-interference protrusion is higher than the protrusion heights of the support limiting ring, the limiting body and the drive connection assembly respectively arranged on the first end surface of the mechanical plate; the anti-interference protrusion is used to prevent the locking cover from pressing down on the drive connection assembly and the convex gear plate.

[0014] Optionally, the limiting support structure further includes a foot-picking structure, and at least two of the foot-picking structures are provided, and at least two of the foot-picking structures are spaced apart and arranged on the support limiting ring.

[0015] Optionally, the convex gear plate includes a ring-shaped body, a connecting groove, a limiting protrusion and a gear ring;

[0016] The connecting slide groove is provided on one side of the ring-shaped body facing the first end surface of the mechanical plate, and the connecting slide groove is in sliding connection with the support limiting ring;

[0017] The limiting protrusion is provided on the outer peripheral side of the ring-shaped body, and the limiting protrusion is provided on the outer peripheral side of the ring-shaped body in the radial direction of the ring-shaped body; when the ring-shaped body rotates to the first position, the limiting protrusion presses the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when the ring-shaped body rotates to the second position, the swing arm is released, so that the swing arm contacts the ratchet assembly to be in a locked state;

[0018] The gear ring is arranged on the inner circumference side of the ring-shaped main body, and the rack of the gear ring is meshed and connected with the second-stage gear shaft of the second connecting gear shaft.

[0019] Optionally, the swing arm includes an abutment arm and a locking arm;

[0020] When the webbing is not restraining the human body, the webbing does not drive the core shaft to rotate, and the limiting protrusion contacts the abutting arm of the swing arm to inhibit the swing arm from swinging; at the same time, the counterweight drives the vehicle sensing component to rotate by its own gravity, so that the vehicle sensing ball of the vehicle sensing component is always in a horizontal position when the retractor body rotates with the car seat, and the webbing can be pulled out or rewound at the rotation angle of the car seat;

[0021] When the webbing restrains the human body, the webbing drives the core shaft to rotate, and drives the limiting protrusion to rotate to form a swingable space relative to the swing arm; at the same time, the vehicle sensing component has an inertial force when locked and swings through the inertial force, so as to drive the swing arm to swing in the swing space to contact the ratchet assembly to be in a locked state.

[0022] Optionally, it further includes a support pillow block; 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 support pillow block is used to support the drive connection assembly.

[0023] Optionally, a limit block is further included, wherein the limit block is arranged on the mechanical plate, two limit blocks are arranged, and the two limit blocks are distributed along the circumference of the mechanical plate, and a limit gap is formed between the two limit blocks.

[0024] The present application also provides a seat belt retractor, which includes the front end anti-locking device described above.

[0025] The present application also provides a car seat, which includes the above-mentioned seat belt retractor.

[0026] Compared with the prior art, this application has the following advantages:

[0027] The present application provides a front-end anti-locking device installed on a seat belt retractor, wherein the seat belt retractor includes a retractor body provided on a car seat, a mechanical plate provided on the retractor body, a core shaft and a locking cover, a ratchet assembly provided on the inner side of the mechanical plate, a vehicle sensing assembly provided in a vehicle sensing accommodation structure of the mechanical plate, and a drive connection assembly connected to the core shaft, and further includes: a position limiting support structure, a convex gear plate and a swing arm; the position limiting support structure is provided 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 swing arm is movably provided on the mechanical plate and is located on the side of the vehicle sensing accommodation structure, and can be rotated by the vehicle sensing arm of the vehicle sensing assembly. The convex gear plate is slidably connected to the position limiting support structure, and when rotated to the first position, presses the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when rotated to the second position, the swing arm is released, so that the swing arm contacts the ratchet assembly to be in a locked state.

[0028] The front-end anti-locking device provided by the present application rotates the convex gear plate to corresponding first and second positions, thereby separating the swing arm from the ratchet assembly to unlock the device and engaging the ratchet assembly to lock the device. When the convex gear plate is rotated to the first position, it presses against the swing arm, disabling the vehicle sensing ball of the vehicle sensing assembly. Even after the car seat back is folded down, the retractor can pull the webbing a certain distance before the vehicle sensing function comes into play, thereby satisfying the folding function without affecting the various functions of the retractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the front-end anti-locking device provided in an embodiment of the present application.

[0030] Figure 2 It is a structural schematic diagram of the convex gear plate provided in an embodiment of the present application.

[0031] Figure 3 This is a structural diagram of the drive connection assembly and the locking member provided in an embodiment of the present application installed on a mechanical plate.

[0032] Figure 4 This is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] Retractor body 1, core shaft 11, locking cover 12, mechanical plate 2, vehicle sensing accommodating structure 21, limiting support structure 3, support limiting ring 31, limiting body 32, anti-interference protrusion 33, protrusion 331, foot-picking structure 34, convex gear plate 4, ring-shaped main body 41, limiting protrusion 42, gear ring 43, support shaft platform 5, locking part 6, limiting block 7, drive connection assembly 8. DETAILED DESCRIPTION

[0035] The following description sets forth many specific details to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present application. Therefore, the present application is not limited to the specific implementations disclosed below.

[0036] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In related technology, some vehicle seats feature zero-gravity seating, wide-angle adjustment, and even full reclining. However, during wide-angle adjustment, the seatbelt retractors of existing zero-gravity seats are prone to locking, making it difficult to pull out or retract the webbing, impacting passenger comfort and safety.

[0039] In light of this, the present application provides a front-end anti-locking device installed on a seat belt retractor, the seat belt retractor comprising a retractor body mounted on a car seat, a mechanical plate mounted on the retractor body, a spindle and a locking cover, a ratchet assembly mounted on the inner side of the mechanical plate, a vehicle sensing assembly mounted in a vehicle sensing accommodation structure of the mechanical plate, and a drive connection assembly connected to the spindle, further comprising: a position limiting support structure, a convex gear plate and a swing arm; the position limiting support structure is mounted on a 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 swing arm is movably mounted on the mechanical plate and is located on the side of the vehicle sensing accommodation structure, and can rotate under the drive of the vehicle sensing arm of the vehicle sensing assembly. The convex gear plate is slidably connected to the position limiting support structure and, when rotated to a first position, presses against the swing arm, separating the swing arm from the ratchet assembly to be in an unlocked state; and, when rotated to a second position, releases the swing arm, causing the swing arm to contact the ratchet assembly to be in a locked state.

[0040] The front-end anti-locking device provided by the present application rotates the convex gear plate to corresponding first and second positions, thereby separating the swing arm from the ratchet assembly to unlock the device and engaging the ratchet assembly to lock the device. When the convex gear plate is rotated to the first position, it presses against the swing arm, disabling the vehicle sensing ball of the vehicle sensing assembly. Even after the car seat back is folded down, the retractor can pull the webbing a certain distance before the vehicle sensing function comes into play, thereby satisfying the folding function without affecting the various functions of the retractor.

[0041] Next, the front-end anti-locking device 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 the front-end anti-locking device provided in an embodiment of the present application. Figure 2 It is a structural schematic diagram of the convex gear plate provided in an embodiment of the present application. Figure 3 This is a structural diagram of the drive connection assembly and the locking member provided in an embodiment of the present application installed on a mechanical plate. Figure 4This is a structural schematic diagram of a seat belt retractor provided in an embodiment of the present application.

[0042] like Figures 1 to 4 As shown, the present application provides a front-end anti-locking device, which includes: a retractor body 1 provided on a car seat, a mechanical plate 2 provided on the retractor body 1, and a locking cover 12. The retractor body 1 includes a bracket assembly, a core shaft 11, a preload wheel, a torsion bar, a shaft head, a locking block assembly, and a ratchet assembly. The core shaft 11 is mounted on the bracket assembly, the preload wheel is connected to one end of the core shaft 11, the torsion bar is provided inside the preload wheel, the shaft head is connected to the torsion bar, and the locking block assembly is connected to the shaft head. The mechanical plate 2 encapsulates the locking block assembly and the ratchet assembly on the first side of the mechanical plate 2 relative to the bracket assembly. The locking cover 12 encapsulates the mechanical plate 2 and is connected to the first side of the bracket assembly. The system further includes a vehicle sensor assembly disposed within the vehicle sensor housing structure 21 of the mechanical plate 2 and a counterweight connected to the vehicle sensor assembly. The vehicle sensor assembly comprises a vehicle sensor mounting seat, a vehicle sensor body, a vehicle sensor arm, a vehicle sensor ball, and a convex gear. The vehicle sensor mounting seat is mounted within the vehicle sensor housing structure 21, the vehicle sensor body is mounted within the mounting seat, and the vehicle sensor ball is housed within the vehicle sensor body, which drives the vehicle sensor arm. The convex gear is connected to the vehicle sensor body and rotates synchronously with the vehicle sensor body. The counterweight is connected to the vehicle sensor body so that the counterweight's own weight drives the vehicle sensor mounting seat to rotate. A drive connection assembly 8 connected to the core shaft 11 is also included.

[0043] In this embodiment, the seat belt retractor further includes a limiting support structure 3, a convex gear plate 4, and a swing arm. The limiting support structure 3 is provided on the first end face of the mechanical plate 2, and the first end face of the mechanical plate 2 is the end face of the mechanical plate 2 facing the locking cover 12. The swing arm is movably provided on the mechanical plate 2 and is located on the side of the vehicle sensing accommodating structure 21, and can be rotated by the vehicle sensing arm of the vehicle sensing assembly. The convex gear plate 4 is slidably connected to the limiting support structure 3, and when rotated to the first position, presses against the swing arm, separating the swing arm from the ratchet assembly to be in an unlocked state, and releases the swing arm when rotated to the second position, causing the swing arm to contact the ratchet assembly to be in a locked state.

[0044] The specific structure and connection relationship of each of the above components will be further described below.

[0045] Specifically, in the present embodiment, the limiting support structure 3 is provided on the first end face of the mechanical plate 2, and the first end face of the mechanical plate 2 is the end face of the mechanical plate 2 facing the locking cover 12. Specifically, in the present embodiment, the limiting support structure 3 includes: a support limiting ring 31 and a limiting body 32. Among them, the support limiting ring 31 is provided on the first end face of the mechanical plate 2 around the center of the mechanical plate 2. The support limiting ring 31 is circular. The limiting body 32 is provided on the first end face of the mechanical plate 2 and is located on the outside of the support limiting ring 31. In one example, a portion of the limiting body 32 is provided in an arc shape. The convex gear plate 4 is slidably connected to the support limiting ring 31 and is confined between the support limiting ring 31 and the limiting body 32.

[0046] In this embodiment, the position-limiting support structure 3 further includes an anti-interference protrusion 33 disposed on the first end surface of the mechanical plate 2. The anti-interference protrusion 33 is higher than the protrusions of the support and limiting ring 31, the limiting body 32, and the drive connection assembly 8 disposed on the first end surface of the mechanical plate 2. The anti-interference protrusion 33 is used to prevent the locking cover 12 from pressing down and interfering with the drive connection assembly 8, the convex gear plate 4, and the locking member 6. In one example, the anti-interference protrusion 33 comprises an integrally formed irregular arc-shaped body, a recessed portion, and a raised portion 331. The irregular arc-shaped body is disposed between the first connecting gear shaft and the support pillow block 5. The recessed portion is located in the middle of the irregular arc-shaped body, and the first-stage gear shaft can cover the recessed portion. The raised portions 331 are located at the ends of the irregular arc-shaped body and are higher than the protrusions of the support and limiting ring 31, the limiting body 32, and the drive connection assembly 8 disposed on the first end surface of the mechanical plate 2.

[0047] In this embodiment, the position-limiting support structure 3 further includes a claw structure 34, of which at least two are provided, and at least two claw structures 34 are spaced apart and arranged on the support limit ring 31. The claw structures 34 are pressed against the convex gear plate 4 to prevent loosening and limit the position, while also reducing vibration and abnormal noise.

[0048] The convex gear plate 4 is slidably connected to the limiting support structure 3. Specifically, in this embodiment, the convex gear plate 4 includes a ring-shaped body 41, a connecting groove, a limiting protrusion 42, and a gear ring 43. The connecting groove is provided on the side of the ring-shaped body 41 facing the first end surface of the mechanical plate 2. The limiting protrusion 42 is provided on the outer circumference of the ring-shaped body 41, and the limiting protrusion 42 is provided in the radial direction of the ring-shaped body 41 and protrudes from the outer circumference of the ring-shaped body 41. When the ring-shaped body 41 rotates to the first position, the limiting protrusion 42 presses against the swing arm, separating the swing arm from the ratchet assembly and entering an unlocked state. Furthermore, when the ring-shaped body 41 rotates to the second position, the limiting protrusion 42 releases the swing arm, causing the swing arm to contact the ratchet assembly and enter a locked state. The gear ring 43 is provided on the inner circumference of the ring-shaped body 41, and the rack of the gear ring 43 meshes with the second-stage gear shaft of the second connecting gear shaft.

[0049] The swing arm is movably mounted on the mechanical plate 2 and is located on the side of the vehicle sensing housing structure 21. It can rotate under the influence of the vehicle sensing arm of the vehicle sensing assembly. The swing arm includes an abutting arm and a locking arm. The abutting arm and the locking arm are respectively arranged toward the convex gear plate 4. The abutting arm can abut against the limiting protrusion 42, and the locking arm abuts against the wheel assembly. When the webbing is not restraining the human body, the webbing does not drive the core shaft 11 to rotate, and the limiting protrusion 42 contacts the abutting arm of the swing arm to inhibit the swing arm from swinging. At the same time, the counterweight drives the vehicle sensing assembly to rotate through its own gravity, so that the vehicle sensing ball of the vehicle sensing assembly is always in a horizontal position when the retractor body 1 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 is restraining the human body, the webbing drives the core shaft 11 to rotate and drives the limiting protrusion 42 to rotate to form a swingable space relative to the swing arm. At the same time, the vehicle sensing ball has an inertial force when the vehicle sensing assembly is locked and swings through the inertial force to drive the swing arm to swing in the swing space to contact the ratchet assembly to be in a locked state.

[0050] In this embodiment, a limit stopper 7 is further included, and the limit stopper 7 is provided on the mechanical plate 2. Specifically, in one example, two limit stops 7 are provided, and the two limit stops 7 are distributed along the circumference of the mechanical plate 2. Figure 1 In the figure, the limit stop 7 on the left is called the first limit stop 7, and the limit stop 7 on the right is called the second limit stop 7. The limit gap between the first limit stop 7 and the second limit stop 7 represents the swing range of the connecting arm of the locking member 6. When the connecting assembly 8 is driven to rotate in the first direction and the connecting arm of the locking wire rod swings to the first limit stop 7, the connecting arm disengages from the convex gear of the vehicle sensing assembly. When the connecting assembly 8 is driven to rotate in the second direction and the connecting arm of the locking wire rod swings to the second limit stop 7, the connecting arm contacts the convex gear of the vehicle sensing assembly.

[0051] In this embodiment, a support block 5 is further included. The support block 5 is disposed on the first end surface of the mechanical plate 2 and is located on the side of the center of the mechanical plate 2. The support block 5 is used to support the drive connection assembly 8.

[0052] The present application provides a front-end anti-locking device installed on a seat belt retractor. The seat belt retractor includes a retractor body 1 provided on a car seat, a mechanical plate 2 provided on the retractor body 1, a core shaft 11 and a locking cover 12, a ratchet assembly provided on the inner side of the mechanical plate 2, a vehicle sensing assembly provided in a vehicle sensing accommodation structure 21 of the mechanical plate 2, and a drive connection assembly 8 connected to the core shaft 11. The device also includes: a position limiting support structure 3, a convex gear plate 4, and a swing arm; the position limiting support structure 3 is provided on a first end face of the mechanical plate 2; the first end face of the mechanical plate 2 is the end face of the mechanical plate 2 facing the locking cover 12. The swing arm is movably provided on the mechanical plate 2 and is located on the side of the vehicle sensing accommodation structure 21, and can rotate under the drive of the vehicle sensing arm of the vehicle sensing assembly. The convex gear plate 4 is slidably connected to the limiting support structure 3, and when it is rotated to the first position, it presses the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when it is rotated to the second position, it releases the swing arm, so that the swing arm contacts the ratchet assembly to be in a locked state.

[0053] The front-end anti-locking device provided herein is configured to rotate the convex gear plate 4 to corresponding first and second positions, thereby disengaging the swing arm from the ratchet assembly for an unlocked state and engaging the ratchet assembly for a locked state. When the convex gear plate 4 is rotated to the first position, it presses against the swing arm, disabling the vehicle sensing ball of the vehicle sensing assembly. Even after the car seat back is folded down, the retractor can pull the webbing a certain distance before the vehicle sensing function takes effect, thereby satisfying the folding function without affecting the various functions of the retractor.

[0054] The present application also provides a seat belt retractor, which includes the above-mentioned front end anti-locking device. The specific description of the front end anti-locking device can be found in the description of the above-mentioned embodiment, and will not be repeated here.

[0055] The present application also provides a car seat, which includes the above-mentioned seat belt retractor.

[0056] It should be noted that although several structures, components, or units for realizing related functions are mentioned in the above detailed description, such division is not mandatory. In fact, depending on the specific implementation of the application, the features and functions of two or more structures, components, or units described above can be embodied in one structure, component, or unit. Conversely, the features and functions of one structure, component, or unit described above can be further divided into multiple components, structures, or units for embodiment.

[0057] Furthermore, although the components of the assembly or device of the present application and the arrangement of the components are depicted in a particular order in the drawings, this does not require or imply that the assembly or device must be designed in accordance with the particular components or arrangement of the components, or that all of the components shown must be included to achieve the desired results. Additionally or alternatively, certain components may be omitted, multiple components may be combined into one component to achieve corresponding functions, and / or one component may be decomposed into multiple components to achieve corresponding functions, etc.

[0058] Although the present application is disclosed as above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A front-end anti-locking device installed on a seat belt retractor, the seat belt retractor comprising a retractor body mounted on a car seat, a mechanical plate mounted on the retractor body, a core shaft and a locking cover, a ratchet assembly mounted on the inner side of the mechanical plate, a vehicle sensing assembly mounted in a vehicle sensing accommodation structure of the mechanical plate, and a drive connection assembly connected to the core shaft, characterized in that: Also includes: Limit support structure, convex gear plate and swing arm; The position-limiting support structure is provided on the first end surface of the mechanical plate; the first end surface of the mechanical plate is the end surface of the mechanical plate facing the locking cover; The swing arm is movably arranged on the mechanical plate and is located on the side of the vehicle sensing accommodating structure, and can be rotated under the driving of the vehicle sensing arm of the vehicle sensing assembly; The convex gear plate is slidably connected to the limiting support structure, and when rotated to a first position, presses against the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when rotated to a second position, releases the swing arm, so that the swing arm contacts the ratchet assembly to be in a locked state.

2. The front end anti-locking device according to claim 1, characterized in that: The limiting support structure includes: a supporting limiting ring and a limiting body; The support limiting ring surrounds the center of the mechanical plate and is arranged on the first end surface of the mechanical plate; The limiting body is arranged on the first end surface of the mechanical plate and is located outside the supporting limiting ring; The convex gear plate is slidably connected to the support limiting ring and is confined between the support limiting ring and the limiting body.

3. The front end anti-locking device according to claim 2, characterized in that: The limiting support structure also includes: an anti-interference protrusion, which is arranged on the first end surface of the mechanical plate, and the protrusion height of the anti-interference protrusion is higher than the protrusion height of the support limiting ring, the limiting body and the drive connection assembly respectively arranged on the first end surface of the mechanical plate; the anti-interference protrusion is used to prevent the locking cover from pressing down on the drive connection assembly and the convex gear plate.

4. The front end anti-locking device according to claim 2, characterized in that: The position-limiting support structure further includes a foot-picking structure, and at least two of the foot-picking structures are provided, and at least two of the foot-picking structures are spaced apart and arranged on the support position-limiting ring.

5. The front end anti-locking device according to claim 2, characterized in that: The convex gear plate includes a ring-shaped main body, a connecting groove, a limiting protrusion and a gear ring; The connecting slide groove is provided on one side of the ring-shaped body facing the first end surface of the mechanical plate, and the connecting slide groove is in sliding connection with the support limiting ring; The limiting protrusion is provided on the outer peripheral side of the ring-shaped body, and the limiting protrusion is provided on the outer peripheral side of the ring-shaped body in the radial direction of the ring-shaped body; when the ring-shaped body rotates to the first position, the limiting protrusion presses the swing arm, so that the swing arm is separated from the ratchet assembly to be in an unlocked state; and when the ring-shaped body rotates to the second position, the swing arm is released, so that the swing arm contacts the ratchet assembly to be in a locked state; The gear ring is arranged on the inner circumference side of the ring-shaped main body, and the rack of the gear ring is meshed and connected with the second-stage gear shaft of the second connecting gear shaft.

6. The front end anti-locking device according to claim 5, characterized in that: The swing arm includes an abutment arm and a locking arm; When the webbing is not restraining the human body, the webbing does not drive the core shaft to rotate, and the limiting protrusion contacts the abutting arm of the swing arm to inhibit the swing arm from swinging; at the same time, the counterweight drives the vehicle sensing component to rotate by its own gravity, so that the vehicle sensing ball of the vehicle sensing component is always in a horizontal position when the retractor body 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 to rotate, and drives the limiting protrusion to rotate to form a swingable space relative to the swing arm; at the same time, the vehicle sensing component has an inertial force when locked and swings through the inertial force, so as to drive the swing arm to swing in the swing space to contact the ratchet assembly to be in a locked state.

7. The front end anti-locking device according to claim 1, characterized in that: It also includes a support pillow block; 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 support pillow block is used to support the drive connection assembly.

8. The front end anti-locking device according to claim 1, characterized in that: It also includes a limit block, which is arranged on the mechanical plate. There are two limit blocks, and the two limit blocks are distributed along the circumference of the mechanical plate, and a limit gap is formed between the two limit blocks.

9. A seat belt retractor, characterized in that: It comprises a front end anti-locking device as described in any one of claims 1 to 8.

10. A car seat, characterized in that: The invention comprises the seat belt retractor as claimed in claim 9.

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