Webbing force adjustable retractor and webbing force adjustment device

Abstract

The application provides a belt force adjustable retractor, which is characterized in that the belt force adjusting device and the retractor body are designed separately, the belt is connected to the reel of the retractor body after passing through the belt force adjusting device, the belt force adjusting device and the retractor body are designed separately, the structure is simplified, the development difficulty is reduced, the cost is reduced, and the belt force adjusting device can be adapted to different types of retractor bodies. Meanwhile, the application also provides a belt force adjusting device, which comprises a frame, a driving roller shaft and a driven roller shaft rotatably arranged on the frame, a power driving device for driving the driving roller shaft to rotate, and a controller for receiving a vehicle body signal and controlling the power driving device to act according to the vehicle body signal; the controller outputs corresponding control signals to control the power driving device to act according to different working conditions of the vehicle, so as to control the driving roller shaft to act, the driving roller shaft and the driven roller shaft cooperate to realize the rewinding or releasing of the belt, and the belt force is adjusted, thereby realizing the belt force adjusting function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of retractor, and particularly relates to a retractor with adjustable webbing force and a webbing force adjusting device. BACKGROUND

[0002] The retractor is a necessary safety device for a vehicle, which can tightly fasten the occupant to the seat through the webbing when the vehicle collides or brakes in emergency, so as to protect the safety of the occupant.

[0003] With the mandatory installation and popularization of the automatic emergency braking system (AEB) of the vehicle, the occupant in the vehicle is off the seat due to the emergency braking, and the airbag cannot provide effective protection, and even causes serious injury to the occupant. In order to solve the problem, the retractor driven by the motor is usually used at present, for example, the retractor driven by the motor is disclosed in Chinese patents CN113183915A and CN113859170A.

[0004] The retractor driven by the motor integrates the motor driving device in the retractor body, the output end of the motor is connected with the cycloid reducer, the output end of the cycloid reducer is connected with the clutch, and the output end of the clutch is connected with the reel shaft of the retractor. Finally, the torque is transmitted to the reel shaft. The retractor driven by the motor can control the webbing force on the reel shaft by controlling the torque output by the motor according to different working conditions of the vehicle.

[0005] However, the retractor driven by the motor integrates the motor driving module and the retractor body into an integral structure, the structure is very complex, the development difficulty is great, and the cost is high. And the retractor driven by the motor needs to design different structures of the motor driving module to adapt to different types of retractor bodies during development, and the adaptability is poor.

[0006] Therefore, how to provide a retractor with adjustable webbing force and a webbing force adjusting device, so as to simplify the structure, reduce the cost, and improve the adaptability under the premise of being able to adjust the webbing force, has become a technical problem to be solved by the person skilled in the art. SUMMARY

[0007] Therefore, how to provide a retractor with adjustable webbing force and a webbing force adjusting device, so as to simplify the structure, reduce the cost, and improve the adaptability under the premise of being able to adjust the webbing force, has become a technical problem to be solved by the person skilled in the art.

[0008] In order to achieve the above-mentioned purpose, the present application provides a webbing force adjustable retractor, which comprises a retractor body for storing and locking the webbing, and a webbing force adjusting device for assisting the webbing to be retracted or released under predetermined working conditions, the webbing being connected to the reel of the retractor body after passing through the webbing force adjusting device, and the webbing force adjusting device being capable of adjusting the webbing force of the webbing to be retracted or released according to different working conditions of the vehicle.

[0009] Preferably, the webbing force adjustable retractor has:

[0010] a first state of normal driving of the vehicle, in which the webbing force adjusting device does not act, and the webbing can be normally pulled out and retracted;

[0011] a second state of potential risk of the vehicle, in which the webbing force adjusting device repeatedly pulls and vibrates the webbing to remind the driver to take measures, and the webbing force is 20-60 N;

[0012] a third state of emergency braking or steering of the vehicle, in which the webbing force adjusting device retracts the webbing to effectively constrain the upper body of the occupant to prevent excessive forward or lateral leaning, and the webbing force is 100-200 N;

[0013] a fourth state of inevitable collision of the vehicle, in which the webbing force adjusting device retracts the webbing to quickly eliminate the gap between the webbing and adjust the occupant to the best posture, and the webbing force is 100-200 N;

[0014] a fifth state after the vehicle collision, in which the pre-tightening function of the retractor body is started to quickly tighten the webbing to firmly fix the occupant on the seat, and the webbing force is 2000-4000 N.

[0015] Preferably, the webbing force adjusting device comprises a frame, a driving roller shaft and a driven roller shaft rotatably arranged on the frame, a power driving device for driving the driving roller shaft to rotate, and a controller for receiving the vehicle body signal and controlling the power driving device to act according to the vehicle body signal.

[0016] The driving roller shaft and the driven roller shaft are in transmission connection to make the driven roller shaft rotate synchronously with the driving roller shaft.

[0017] The outer peripheral walls of the driving roller shaft and the driven roller shaft are provided with shaft teeth in mesh with each other, and a certain position of the driving roller shaft is designed to be toothless to form a gap, and the gap cooperates with the shaft teeth of the driven roller shaft to form a passage for the webbing to pass through freely.

[0018] Preferably, the frame body of the frame is provided with a mounting hole, and the driving roller shaft is rotatably arranged in the mounting hole.

[0019] The driven roller shaft is rotatably supported on the two supports outside the frame body through the support shafts protruding from both ends thereof.

[0020] Preferably, the support shafts penetrate the driven roller shaft, and the both ends of the driven roller shaft are provided with recessed holes exposing the support shafts so that the both ends of the support shafts form cantilevers.

[0021] The application also provides a belt force adjusting device, comprising a frame, a driving roller shaft and a driven roller shaft rotatably arranged on the frame, a power driving device for driving the driving roller shaft to rotate, and a controller for receiving a vehicle body signal and controlling the power driving device to act according to the vehicle body signal.

[0022] The driving roller shaft and the driven roller shaft are transmissionally connected so that the driven roller shaft rotates synchronously with the driving roller shaft.

[0023] The outer peripheral walls of the driving roller shaft and the driven roller shaft are provided with shaft teeth which are intermeshed, and a certain position of the driving roller shaft is designed with missing teeth to form a gap, which cooperates with the shaft teeth of the driven roller shaft to form a passage for the belt to pass freely.

[0024] Preferably, a transmission gear pair is arranged between the driving roller shaft and the driven roller shaft.

[0025] The transmission gear pair comprises a driving gear fixed to one end of the driving roller shaft, and a driven gear fixed to one end of the driven roller shaft and intermeshed with the driving gear.

[0026] Preferably, the power driving device comprises a motor and a cycloid reducer.

[0027] The output end of the motor is connected with the cycloid reducer, and the output end of the cycloid reducer is connected with the driving roller shaft.

[0028] Preferably, the driving roller shaft is a hollow shaft structure, and the inner hole thereof serves as a containing space for the power driving device.

[0029] The motor and the cycloid reducer are contained in the inner hole of the driving roller shaft and fixed to the frame, and the cycloid wheel of the cycloid reducer is intermeshed with the key teeth on the inner hole wall of the driving roller shaft.

[0030] Preferably, the frame body of the frame is provided with a mounting hole, and the driving roller shaft is rotatably arranged in the mounting hole.

[0031] The driven roller shaft is rotatably supported on the two supports outside the frame body through the support shafts protruding from both ends thereof.

[0032] Preferably, the supporting shaft penetrates the driven roller shaft, and the two ends of the driven roller shaft are provided with recessed holes to expose the supporting shaft, so that the two ends of the supporting shaft form cantilevers.

[0033] Preferably, the diameter of the driving roller shaft is greater than the diameter of the driven roller shaft.

[0034] Preferably, a position sensor is arranged on the driving roller shaft to record the circumferential position of the driving roller shaft and upload to the controller.

[0035] The present application has the following advantages:

[0036] The present application provides a webbing force adjustable retractor, which comprises a retractor body for storing and locking the webbing, and a webbing force adjusting device for assisting the retraction or release of the webbing under a predetermined working condition. The webbing is connected to the reel of the retractor body after passing through the webbing force adjusting device. The webbing force adjusting device can adjust the webbing force of the retraction or release of the webbing according to different working conditions of the vehicle. The webbing force adjustable retractor adopts a split design of the webbing force adjusting device and the retractor body, which simplifies the structure, reduces the development difficulty, reduces the cost, and can adapt to different types of retractor bodies.

[0037] The present application provides a webbing force adjusting device, which comprises a frame, a driving roller shaft and a driven roller shaft rotatably arranged on the frame, a power driving device for driving the driving roller shaft to rotate, and a controller for receiving a vehicle body signal and controlling the power driving device to act according to the vehicle body signal. The controller outputs corresponding control signals to control the power driving device to act according to different working conditions of the vehicle, so as to control the driving roller shaft to act. The driving roller shaft and the driven roller shaft cooperate to realize the retraction or release of the webbing and adjust the webbing force. The structure is simple, and the webbing force adjusting function is realized at low cost. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the application without imposing undue limitation thereon. In the drawings:

[0039] Figure 1 A structural schematic view of the webbing force adjustable retractor provided by the present application;

[0040] Figure 2 A perspective structural schematic view of the webbing force adjusting device provided by the present application;

[0041] Figure 3 A top view of the webbing force adjusting device provided by the present application;

[0042] Figure 4The exploded schematic view of the belt force adjusting device provided by the present application;

[0043] Figure 5 The structural schematic view of the driving roller and the driven roller in the initial state provided by the present application;

[0044] Figure 6 The three-dimensional structural schematic view of the driven roller provided by the present application;

[0045] Figure 7 The sectional view of the driven roller provided by the present application;

[0046] Reference signs

[0047] 100, belt force adjusting device;

[0048] 110, frame; 110-1, frame body; 110-2, support;

[0049] 120, driving roller; 120-1, first shaft tooth; 120-2, notch;

[0050] 130, driven roller; 130-1, second shaft tooth; 130-2, recess;

[0051] 140, power driving device; 140-1, motor; 140-2, cycloid reducer;

[0052] 150, support shaft;

[0053] 160, driving gear;

[0054] 170, driven gear;

[0055] 200, retractor body;

[0056] 300, belt. DETAILED DESCRIPTION

[0057] The core of the present application is to provide a belt force adjustable retractor and a belt force adjusting device, so as to simplify the structure, reduce the cost and improve the adaptability under the premise of being able to adjust the belt force according to different automobile working conditions.

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0059] Embodiment one

[0060] AsFigure 1 as shown, Figure 1 A structure schematic diagram of the belt force adjustable retractor provided by the present application.

[0061] The first embodiment discloses a belt force adjustable retractor, which comprises a retractor body 200 for storing and locking a belt, and a belt force adjusting device 100 for assisting the belt retraction or release under a predetermined working condition, the belt 300 is connected with the reel of the retractor body 200 after passing through the belt force adjusting device 100, and the belt force adjusting device 100 can adjust the belt force of the belt retraction or release according to different working conditions of the vehicle.

[0062] In actual application, the belt force adjusting device 100 receives corresponding working mode instructions from the vehicle CAN bus according to different working conditions of the vehicle, selects the belt retraction or release 300, and adjusts the size of the belt force according to different working conditions of the vehicle.

[0063] For example, in some specific embodiments, the belt force adjustable retractor has:

[0064] The first state of normal driving of the vehicle, wherein the belt force adjusting device 100 does not act, the belt can be normally pulled out and retracted, and the passenger comfort is improved;

[0065] The second state of the vehicle with potential risk (such as deviating from the lane line), wherein the belt force adjusting device 100 repeatedly pulls and vibrates the belt, reminds the driver to take measures, and the belt force is 20-60 N;

[0066] The third state of the vehicle emergency braking or steering (such as automatic avoidance of emergency braking), wherein the belt force adjusting device 100 retracts the belt, effectively restrains the upper body of the passenger, prevents excessive forward or lateral inclination, and the belt force is 100-200 N;

[0067] The fourth state of the vehicle collision being inevitable, wherein the belt force adjusting device 100 retracts the belt, quickly eliminates the belt gap, and adjusts the passenger to the best posture, and the belt force is 100-200 N;

[0068] The fifth state of the vehicle after the collision, wherein the pre-tightening function of the retractor body 200 starts to quickly tighten the belt, and the passenger is firmly fixed on the seat, and the belt force is 2000-4000 N.

[0069] It should be noted that, in the event of a vehicle collision, the action of the webbing force adjustment device 100 occurs before the pre-tensioning of the webbing by the retractor body 200 itself. For example, moment before a collision, the webbing force adjustment device 100 receives a "vehicle collision is inevitable" operating mode from the vehicle's CAN bus. At this time, the webbing force adjustment device 100 quickly rewinds the webbing to eliminate webbing gaps, adjusting the occupant to the optimal posture, with a webbing force of 100-200N. Subsequently, the collision occurs, and the flame generator (MGG) of the retractor body 200 is activated, initiating the pre-tensioning function of the retractor body 200, thereby rapidly pre-tensioning the webbing and firmly securing the occupant to the seat, with a webbing force of approximately 2000-4000N. The structural features and working principle of the webbing force adjustment device 100 will be described in detail in Embodiment 2 below.

[0070] As can be seen from the above technical solution, the adjustable webbing force retractor has a separate structure design for the webbing force adjustment device 100 and the retractor body 200. The webbing force adjustment device 100 is used to adjust the webbing force according to different vehicle operating conditions before a collision, and the retractor body 200 is used to pre-tighten and lock the webbing after a collision. Compared with the background technology, this adjustable webbing force retractor simplifies the structure, reduces development difficulty, and lowers costs due to the separate design of the webbing force adjustment device 100 and the retractor body 200. Furthermore, because the webbing force adjustment device 100 and the retractor body 200 are designed separately, the webbing force adjustment device 100 can be adapted to different types of retractor bodies 200.

[0071] Example 2

[0072] like Figures 2-4 As shown, Figure 2 A three-dimensional structural schematic diagram of the webbing force adjustment device 100 provided by the present invention; Figure 3 A top view of the webbing force adjusting device 100 provided by the present invention; Figure 4 This is an exploded view of the webbing force adjustment device 100 provided by the present invention.

[0073] This embodiment 2 discloses a webbing force adjustment device 100, including: a frame 110, an active roller 120 and a driven roller 130 rotatably arranged on the frame 110, a power drive device 140 for driving the active roller 120 to rotate, and a controller (not shown in the figure) for receiving vehicle body signals and controlling the operation of the power drive device 140 according to the vehicle body signals.

[0074] The driving roller 120 and the driven roller 130 are connected by a transmission, so that the driven roller 130 rotates synchronously with the driving roller 120.

[0075] like Figure 5 As shown, Figure 5The structure schematic diagram of the driving roller shaft and the driven roller shaft in the initial state is provided.

[0076] The outer peripheral wall of the driving roller shaft 120 and the driven roller shaft 130 are provided with the shaft teeth which are engaged with each other, specifically, the first shaft teeth 120-1 are provided on the outer peripheral wall of the driving roller shaft 120, the second shaft teeth 130-1 are provided on the outer peripheral wall of the driven roller shaft 130, and the first shaft teeth 120-1 and the second shaft teeth 130-1 are engaged with each other. And a certain position of the driving roller shaft 120 is designed with missing teeth to form a gap 120-2, and the gap 120-2 cooperates with the first shaft teeth 130-1 of the driven roller shaft 130 to form a channel for the free passing of the belt 300.

[0077] In the actual application process, in the initial state, the belt 300 can smoothly slide through the channel between the gap 120-2 and the second shaft teeth 130-1, without affecting the normal unwinding or rewinding of the belt 300, that is, the belt 300 can be freely unwound or rewound in the normal state without affecting the normal use. In the predetermined working condition, the controller controls the power driving device 140 to drive the driving roller shaft 120 to rotate forward or reverse, the first shaft teeth 120-1 of the driving roller shaft 120 are engaged with the second shaft teeth 130-1 of the driven roller shaft 130, and in this process, the outer profiles of the first shaft teeth 120-1 and the second shaft teeth 130-1 cooperate to clamp the belt 300 and drive the belt 300 to rewind or release. For example, the driving roller shaft 120 rotates forward to rewind the belt, and reverses to release the belt.

[0078] The specific working process of the belt force adjusting device 100 will be described in detail below.

[0079] When the vehicle is in the normal driving working condition, the controller outputs the control signal of the normal driving to control the power driving device 140 to be inactive, and the belt 300 can smoothly slide without affecting the normal unwinding or rewinding of the belt, thereby improving the comfort of the passengers;

[0080] When the vehicle is in the working condition with potential risks (for example, deviating from the lane line), the controller outputs the control signal of the warning mode to control the power driving device 140 to repeatedly rotate forward and reverse, which can realize the repeated pulling and vibrating of the belt 300 to remind the driver to take corresponding measures, and the belt force is 20-60N;

[0081] When the vehicle is in the working condition of emergency braking or steering (for example, automatic avoidance of emergency braking), the controller outputs the control signal of the warning mode and controls the power driving device 140 to tighten the belt, which effectively restricts the upper body of the passenger to prevent excessive forward or lateral inclination, and the belt force is 100-200N;

[0082] When the vehicle is in the situation where the collision is inevitable, the controller outputs the output signal of the collision mode and controls the power driving device 140 to quickly tighten the belt, quickly eliminate the belt gap, and adjust the passenger to the optimal posture, with the belt force being 100-200 N.

[0083] As can be seen from the above description, the belt force adjusting device can select the belt 300 to be rolled back or released according to different working conditions of the vehicle, and adjust the size of the belt force according to different working conditions of the vehicle, with a simple structure and low cost, and the belt force adjusting function is realized.

[0084] As shown in Figure 2 , Figure 3 , in order to further optimize the above technical solution, a transmission gear pair is arranged between the driving roller shaft 120 and the driven roller shaft 130. Specifically, the transmission gear pair includes a driving gear 160 fixed to one end of the driving roller shaft 120, and a driven gear 170 fixed to one end of the driven roller shaft 130 and engaged with the driving gear 160. When the driving roller shaft 160 is actuated in response to the actuation of the power driving device 140, the driven roller shaft 170 can be driven to rotate simultaneously through the transmission gear pair, thereby improving the ability to roll back or release the belt 300.

[0085] As shown in Figure 4 , in some specific embodiments, the power driving device 140 includes a motor 140-1 and a cycloid reducer 140-2. The output end of the motor 140-1 is connected with the cycloid reducer 140-2, and the output end of the cycloid reducer 140-2 is connected with the driving roller shaft 120.

[0086] In actual application, the controller outputs the corresponding control signal to control the motor 140-1 to act, and the driving roller shaft 120 is driven to rotate after the torque is increased by the cycloid reducer.

[0087] In order to further optimize the above technical solution, the driving roller shaft 120 is a hollow shaft structure, and the inner hole thereof serves as the accommodation space of the above-mentioned power driving device 140. The motor 140-1 and the cycloid reducer 140-2 are accommodated in the inner hole of the driving roller shaft 120 and fixed to the frame 110, and the cycloid wheel of the cycloid reducer 140-2 is engaged with the key teeth on the inner hole wall of the driving roller shaft 120. When arranged, the cycloid reducer 140-2 and the motor 140-1 are arranged in sequence along the axial direction of the driving roller shaft 120, and the overall structure is compact and small in volume.

[0088] As shown in Figure 2 , Figure 4 , in some specific embodiments, the frame body 110-1 of the frame 110 is provided with a mounting hole, and the driving roller shaft 120 can be rotatably arranged in the mounting hole. The driven roller shaft 130 is rotatably arranged in the mounting hole through the support shafts 150 (seeFigure 6 、 Figure 7 ) two supports 110-2 rotatably supported on the outer side of the frame body 110-1.

[0089] It should be noted that when the vehicle is involved in a collision accident, the pre-tightening function of the retractor body 200 is activated and the belt 300 is quickly tightened, and the belt force is 2000N-4000N. At this time, under the action of the huge belt force, the driven roller shaft 130 is forced to move away from the driving roller shaft 120, thereby loosening the belt 300, and thus the pre-tightening function of the retractor body 200 itself is not affected after the vehicle is involved in a collision. The movement of the driven roller shaft 130 away from the driving roller shaft 120 is achieved by plastic deformation of the support shaft 150 at both ends of the driven roller shaft 130.

[0090] That is, after the driving roller shaft 120 is rotated to the set position, the belt 300 is clamped and maintained until the flame generator (MGG) is detonated, the belt force on one side increases sharply, the transverse force generated thereby causes the support shaft 150 of the driven roller shaft 130 to plastically deform, so that the driven roller shaft 130 and the driving roller shaft 120 are separated, and the belt 300 is no longer clamped, ensuring that the subsequent pre-tightening function of the retractor body 200 can be smoothly implemented and will not affect the subsequent force limiting function, etc.

[0091] Preferably, in order to improve the plastic deformation effect of the support shaft 150, the support shaft 150 penetrates the driven roller shaft 130, and recessed holes 130-2 exposing the support shaft 150 are provided at both ends of the driven roller shaft 130 to form cantilevered ends at both ends of the support shaft 150, as shown in Figure 7 When the vehicle is involved in a collision, the pre-tightening function of the retractor body 200 is activated, the belt 300 forces the driven roller shaft 130 to move away from the driving roller shaft 120 to loosen the belt 300. In this embodiment, the two ends of the support shaft 150 are designed as cantilevered ends, which are more prone to plastic deformation, to ensure that the belt 300 can be loosened after the pre-tightening function is activated, and the pre-tightening function of the retractor body 200 itself is not affected.

[0092] In some specific embodiments, as shown in Figure 5 , a position sensor is provided on the driving roller shaft 120 to record the circumferential position of the driving roller shaft 120 and upload it to the controller. In actual application, the position sensor marks the initial state of the driving roller shaft 120, and when the function requirement of the belt force adjusting device 100 is completed, the controller finds the initial position of the driving roller shaft 120 through the position sensor and controls the power driving device 140 to return the driving roller shaft 120 to the initial position. In some specific embodiments, in order to save costs, the position sensor can be a Hall sensor.

[0093] In other specific embodiments, the diameter of the drive roller 120 is greater than the diameter of the driven roller 130 to facilitate the spooling or release of the webbing 300.

[0094] It should be noted that each of the embodiments described in the specification is presented in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between embodiments can be mutually referred to.

[0095] It should be understood that if "system", "device", "unit" and / or "module" are used in the present application, it is only a method for distinguishing different components, elements, parts, sections or assemblies of different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

[0096] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, product or device that includes the element.

[0097] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this document is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0098] Hereinafter, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0099] If a flowchart is used in the present application, the flowchart is used to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or subsequent operations do not necessarily be executed in sequence. On the contrary, each step can be processed in reverse order or simultaneously. At the same time, other operations can be added to these processes, or one or more steps of the operation can be removed from these processes.

[0100] The principles and implementations of the present application are described in the specific examples in this article, and the above examples are only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A retractor with adjustable webbing force, characterized in that, The belt force adjustable retractor includes a retractor body for storing and locking the belt, and a belt force adjusting device for assisting the belt to be retracted or released under a predetermined working condition, the belt is connected with a reel of the retractor body after passing through the belt force adjusting device, and the belt force adjusting device can adjust the belt force of the belt to be retracted or released according to different working conditions of the vehicle; The belt force adjustable retractor has: a first state of normal driving of the vehicle, wherein the belt force adjusting device does not act, and the belt can be normally pulled out and retracted; a second state of potential risk of the vehicle, wherein the belt force adjusting device repeatedly pulls and vibrates the belt to remind the driver to take measures; a third state of emergency braking or steering of the vehicle, wherein the belt force adjusting device retracts the belt to effectively restrict the upper body of the occupant and prevent excessive forward or lateral leaning; a fourth state of inevitable collision of the vehicle, wherein the belt force adjusting device retracts the belt to quickly eliminate the gap between the belts and adjust the occupant to the best posture; a fifth state after the vehicle collision, wherein the pre-tightening function of the retractor body is started to quickly tighten the belt and firmly fix the occupant on the seat.

2. The belt force adjustable retractor according to claim 1, wherein: the second state of potential risk of the vehicle, the belt force is 20-60 N; the third state of emergency braking or steering of the vehicle, the belt force is 100-200 N; the fourth state of inevitable collision of the vehicle, the belt force is 100-200 N; the fifth state after the vehicle collision, the belt force is 2000-4000 N.

3. The webbing force adjustable retractor according to claim 1 or 2, characterized by, The belt force adjusting device includes a frame, a driving roller and a driven roller rotatably arranged on the frame, a power driving device for driving the driving roller to rotate, and a controller for receiving a vehicle body signal and controlling the power driving device to act according to the vehicle body signal; The driving roller and the driven roller are transmissionally connected to make the driven roller rotate synchronously with the driving roller; The outer peripheral walls of the driving roller and the driven roller are provided with mutually meshing shaft teeth, and a certain position of the driving roller is designed with a missing tooth to form a gap, and the gap cooperates with the shaft teeth of the driven roller to form a passage for the belt to pass through freely.

4. The webbing force adjustable retractor according to claim 3, wherein The frame body of the frame is provided with a mounting hole, and the driving roller can be rotatably arranged in the mounting hole; The driven roller is rotatably supported on the two supports outside the frame body through support shafts protruding from the two ends of the driven roller.

5. The webbing force adjustable retractor according to claim 4, wherein The support shafts penetrate the driven roller, and the two end portions of the driven roller are provided with recessed holes to expose the support shafts, so that the two ends of the support shafts form cantilevers.

6. A webbing force adjustment device having the webbing force adjustable retractor as claimed in any one of claims 1 to 5, characterized by The belt force adjustable retractor includes a frame, a driving roller and a driven roller rotatably arranged on the frame, a power driving device for driving the driving roller to rotate, and a controller for receiving a vehicle body signal and controlling the power driving device to act according to the vehicle body signal; The driving roller and the driven roller are transmissionally connected to make the driven roller rotate synchronously with the driving roller; The outer peripheral wall of the driving roller and the driven roller are provided with intermeshing shaft teeth, and a certain position of the driving roller is designed with a missing tooth to form a gap, which cooperates with the shaft teeth of the driven roller to form a channel for the free passage of the belt.

7. The webbing force adjustment device according to claim 6, characterized by A transmission gear pair is arranged between the driving roller and the driven roller. The transmission gear pair comprises a driving gear fixed to one end of the driving roller, and a driven gear fixed to one end of the driven roller and engaged with the driving gear.

8. The webbing force adjustment device according to claim 6, characterized by The power driving device comprises a motor and a cycloid reducer. The output end of the motor is connected with the cycloid reducer, and the output end of the cycloid reducer is connected with the driving roller.

9. The webbing force adjustment device according to claim 8, characterized by The driving roller is a hollow shaft structure, and the inner hole serves as a containing space for the power driving device. The motor and the cycloid reducer are contained in the inner hole of the driving roller and fixed to the frame, and the cycloid wheel of the cycloid reducer is engaged with the key teeth on the inner hole wall of the driving roller.

10. The webbing force adjustment device according to claim 6, characterized by The frame body of the frame is provided with a mounting hole, and the driving roller can be rotatably arranged in the mounting hole. The driven roller is rotatably supported on the outer side of the frame body by two supports through support shafts extending from both ends of the driven roller.

11. The webbing force adjustment device according to claim 10, wherein The support shafts penetrate the driven roller, and the two ends of the driven roller are provided with recessed holes to expose the support shafts, so that the two ends of the support shafts form cantilevers.

12. The webbing force adjustment device according to claim 6, characterized by The diameter of the driving roller is greater than that of the driven roller.

13. The webbing force adjustment device according to claim 6, characterized by A position sensor is arranged on the driving roller to record the circumferential position of the driving roller and upload it to the controller.

Images