WO2023220953A1

WO2023220953A1 - Retractor, seat belt device, and apparatus

Info

Publication number: WO2023220953A1
Application number: PCT/CN2022/093461
Authority: WO
Inventors: 张应西; 朱礼任; 曹引维; 袁丽; 吕茂奇; 高磊; 汪长军; 王鹏翔; 陈希正
Original assignee: 浙江吉利控股集团有限公司; 吉利汽车研究院（宁波）有限公司
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2023-11-23

Abstract

A retractor (100), comprising a belt reel (10), a scroll spring (20), a base (30) and a shell cover assembly (40), the base (30) being connected to a frame (200) of a seat belt device (1), the shell cover assembly (40) being connected to the base (30), the shell cover assembly (40) and the base (30) delimiting an accommodation chamber (41), the scroll spring (20) being located in the accommodation chamber (41), the belt reel (10) being used for winding of webbing (300), one end of the belt reel (10) being provided with a winding shaft (11), the center of the base (30) being provided with a first through hole (31), the winding shaft (11) passing through the first through hole (31) and being in clearance fit with the first through hole (31), and of the scroll spring (20), an inner ring end portion being connected to the winding shaft (11) and an outer ring end portion being connected to the shell cover assembly (40). The retractor further comprises damping magnets (50) having a magnetic field, the magnetic field being used for providing a damping force for the belt reel (10), so as to hinder the retraction of the webbing, that is, when the belt reel (10) rotates, the belt reel (10) will cut magnetic induction lines of the magnetic field, so that the magnetic field generates the damping force on the belt reel (10). Also disclosed are a seat belt device having the retractor (100), and an apparatus having the seat belt device. The solution can effectively reduce or avoid collisions between a latch plate and other parts in a vehicle, and avoids the phenomenon that the parts in a vehicle are damaged or abraded by collisions, effectively improving user experience.

Description

A retractor, safety belt device and equipment

Technical field

The present application relates to the technical field of safety belts, and in particular to a retractor, safety belt device and equipment.

Background technique

Seat belts are very important safety parts used on equipment. For example, they are used in vehicles, airplanes, high-altitude operations, and performance performances. Seat belts are used to protect the users (such as drivers, passengers, and high-altitude workers). Safety belts are an important part of the safety of workers. When an accident occurs, seat belts can greatly improve the personal safety of the users.

Taking the application of seat belts in vehicles as an example, the seat belt includes a retractor, a webbing, a lock tongue and a lock buckle. When in use, the webbing can be pulled out of the retractor through the lock tongue and inserted into the socket of the lock buckle. in the slot to achieve safety protection for the driver or passengers. A coil spring is also provided in the retractor, and the coil spring is connected to the webbing. When the webbing is pulled out, the coil spring will elastically tighten under the pull of the webbing, so that the coil spring generates a rewinding force. When the lock tongue comes out of the slot of the lock buckle, the webbing will be retracted into the retractor under the rewinding force of the coil spring, thereby realizing the recovery of the webbing.

However, in the above-mentioned safety belt, when the webbing is retracted under the rewinding force of the coil spring, the speed is relatively high, which can easily cause the lock tongue to collide with other parts in the car, affecting the user experience.

Contents of the invention

In view of the above problems, this application provides a retractor, seat belt device and equipment to solve the problem that in existing seat belts, the webbing has a high speed when being retracted, which easily causes the lock tongue to collide with other structures in the car. Issues affecting user experience.

In order to achieve the above objectives, the embodiments of this application provide the following technical solutions:

A first aspect of this application provides a retractor for use in a safety belt device, including a reel, a coil spring, a base and a cover assembly, the base being used to connect with the frame of the safety belt device, the The shell cover assembly is connected to the base, the base and the shell cover assembly together form an accommodation cavity, and the coil spring is located in the accommodation cavity;

The tape reel is used to wind the webbing in the safety belt device. One end of the tape reel is provided with a reel. A first through hole is opened in the center of the base. The reel passes through the first through hole. The through hole is clearance matched with the first through hole, the inner ring end of the coil spring is connected to the reel, and the outer coil end of the coil spring is connected to the shell cover assembly;

It also includes a damping magnet, the damping magnet has a magnetic field, the magnetic field is used to provide a damping force to the tape reel, and the damping force is used to hinder the retrieval of the webbing.

By arranging a damping magnet in the retractor, the magnetic field of the damping magnet provides a damping force to the reel, so that the damping force hinders the recovery of the webbing. According to Lenz's theorem, it can be seen that the faster the reel rotates (that is, the reel The faster the tape drum cuts the magnetic field lines), the greater the damping force exerted by the magnetic field on the tape drum. In this way, when the lock tongue is just released from the lock buckle, the rewinding force of the coil spring is relatively maximum, which can cause the webbing to obtain a relatively maximum acceleration, so that the recovery speed of the webbing is also rapidly increased (that is, the tape reel has a higher rotation speed), at this time, the magnetic field of the damping magnet can exert a relatively large damping force on the reel, thereby effectively hindering the recovery of the webbing and reducing the recovery speed of the webbing. As the rewinding force of the coil spring decreases, the recovery speed of the webbing also gradually slows down (that is, the rotation speed of the tape drum gradually slows down). At this time, the damping force of the magnetic field on the tape drum also decreases relatively, so that The webbing can be smoothly and slowly retracted into the retractor, which means that the lock tongue moves at a relatively smooth and slow speed throughout the entire process. This can effectively reduce or avoid collisions between the lock tongue and other components in the car, and prevent components in the car from being damaged due to impact. Damage or wear occurs, thereby effectively improving the user experience.

In a possible implementation manner, the damping magnet is provided on the base, and the damping magnet is located on a side of the base facing the tape reel.

In a possible implementation manner, a magnet seat is further included, the magnet seat is located in the accommodation cavity, and the magnet seat is located on a side of the coil spring facing away from the tape reel, and the magnet seat A mounting hole is provided on the base, and the damping magnet is located in the mounting hole;

It also includes a current ring and a coil spring cover located in the accommodation cavity, the coil spring cover is connected to the shell cover assembly, and the coil spring cover is located on the side of the coil spring facing away from the base;

The current loop is connected to the tape reel, and the current loop is located between the coil spring cover and the damping magnet. When the webbing is retracted, the current loop moves toward the direction of the damping magnet. And rotates relative to the damping magnet, and the magnetic field of the damping magnet provides damping force to the tape reel through the current loop.

In a possible implementation, it also includes a connecting member, which includes a connecting shaft and an abutment portion located at one end of the connecting shaft, and the connecting shaft passes through the current ring and the coil spring cover in sequence. and connected to said reel;

The contact portion is in contact with the current ring, the connecting shaft is snap-fitted with the current ring, and the connecting shaft is rotationally connected with the coil spring cover;

When the webbing is retracted, the connecting shaft drives the current ring to rotate and move toward the damping magnet.

In one possible implementation, a limiting groove is provided at one end of the connecting shaft facing away from the abutting portion, and a limiting portion is provided on the outer periphery of the reel that fits with the limiting groove. The position portion is inserted into the limiting groove, a second through hole is opened at the bottom of the limiting groove, and the reel passes through the second through hole and is rotationally connected to the shell cover assembly;

The limiting portion has a first inclined surface, and the limiting groove has a second inclined surface matching the first inclined surface. When the tape reel rotates, the limiting portion passes through the first inclined surface. The cooperation between the inclined surface and the second inclined surface drives the connecting shaft to rotate and pushes the connecting shaft to move along the axis of the tape reel.

In one possible implementation, a through slot is opened in the center of the magnet seat, and the side of the contact portion facing away from the connecting shaft has a protruding elastic body, and the contact portion passes through the The through groove is in contact with the shell cover assembly through the elastic body.

In a possible implementation manner, the shell cover assembly includes a first side wall, a second side wall and a top cover connected in sequence, the first side wall is connected to the base, and the second side wall is located at between the first side wall and the top cover;

The first side wall is arranged around the outer periphery of the coil spring, the second side wall is arranged around the outer periphery of the magnet seat, and the reel is rotationally connected to the top cover.

In one possible implementation, the inner wall of the second side wall has internal threads, and the outer wall of the magnet seat has external threads that cooperate with the internal threads;

The magnet seat and the second side wall are movably connected through the cooperation of the internal thread and the external thread, and the moving direction of the magnet seat is parallel to the axis of the tape reel.

In a possible implementation manner, the number of the damping magnets is multiple, and the plurality of damping magnets are distributed around the axis of the tape reel.

In one possible implementation manner, the N-S poles of two adjacent damping magnets are placed in opposite directions.

A second aspect of this application provides a safety belt device, which at least includes a frame, a webbing, a lock tongue, and any of the above retractors;

The retractor is arranged on the frame, the webbing is wound on the tape reel, and the locking tongue is arranged on the webbing.

A third aspect of the present application provides a device, which at least includes the above-mentioned safety belt device, and the safety belt device is arranged on the device through the frame.

Description of the drawings

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a safety belt device provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a retractor provided by an embodiment of the present application;

Figure 3 is an exploded schematic diagram of a retractor provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of another retractor provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of a current loop provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of a connector provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of a connector provided by the application embodiment from another perspective;

Figure 8 is a schematic structural diagram of a tape reel provided by an embodiment of the present application;

Figure 9 is a schematic structural diagram of a tape reel provided by an embodiment of the present application from another perspective;

Figure 10 is a schematic structural diagram of a connecting piece and a tape reel provided in an embodiment of the present application;

Figure 11 is an enlarged view of area A in Figure 10;

Figure 12 is a schematic structural diagram of a connector provided by an embodiment of the present application from another perspective;

Figure 13 is a schematic structural diagram of the cooperation between a connector and a shell cover assembly provided by an embodiment of the present application;

Figure 14 is an exploded schematic diagram of a shell cover assembly provided by an embodiment of the present application;

Figure 15 is an exploded schematic diagram of the cooperation between the magnet seat and the second side wall provided by the embodiment of the present application;

Figure 16 is a schematic structural diagram of a damping magnet provided by an embodiment of the present application.

Explanation of reference symbols:

1-seat belt device; 100-retractor; 10-tape reel;

11-scroll; 12-limiting part; 121-first slope;

20-coil spring; 30-base; 31-first through hole;

40-shell cover assembly; 41-accommodation cavity; 42-first side wall;

43-second side wall; 431-internal thread; 44-top cover;

50-damping magnet; 60-magnet seat; 61-mounting hole;

62-Through slot; 63-External thread; 70-Current loop;

71-clip hole; 80-coil spring cover; 81-third through hole;

90-Connecting piece; 91-Connecting shaft; 911-Clamping part;

912-limiting groove; 9121-second slope; 913-second through hole;

92-butting part; 921-elastomer; 200-frame;

300-ribbon; 400-lock tongue; 500-guide ring.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

Figure 1 is a schematic structural diagram of a safety belt device provided by an embodiment of the present application.

Embodiments of the present application provide a retractor, a safety belt device including the retractor, and equipment including the safety belt device, where the equipment can be a car, a truck, an airplane, a high-altitude amusement equipment, or a high-altitude working equipment. Any equipment with a safety belt.

Taking the device as a car as an example, the device may include a seat and a safety belt device. As shown in FIG. 1 , the safety belt device 1 may include a retractor 100 , a frame 200 and a webbing 300 , wherein the frame 200 may be used for fixation. The retractor 100 can be fixed on the device through the frame 200 . The retractor 100 can be used to retract the webbing 300 to realize the storage of the webbing 300 .

The safety belt device 1 may also include a lock tongue 400, a lock buckle (not shown in the figure) and a guide ring 500. The guide ring 500 may be disposed on the device, and the webbing 300 may extend from the guide ring 500. The lock tongue 400 can be set on the webbing 300, and the lock buckle can be set on the seat. When the user is sitting on the seat, the user can pull the lock tongue 400 to pull the webbing 300 out of the retractor 100, and pull the webbing 300 out of the retractor 100. The lock tongue 400 is inserted into the slot of the lock buckle, so that the webbing 300 restrains the user to the seat. When an accident occurs, the user can be effectively prevented from being separated from the seat, thereby effectively ensuring the user's personal safety.

Usually when the webbing is pulled out of the retractor, it will pull the coil spring in the retractor to elastically shrink, causing the coil spring to generate a rewinding force. When the lock tongue comes out of the slot of the lock buckle, the webbing will move in the coil spring. It will be retracted into the retractor under the action of rewinding force.

However, as the length of the webbing increases, the elastic tightening amount of the coil spring also becomes larger and larger. When the lock tongue is inserted into the lock buckle, at this time, the elastic tightening amount of the coil spring is relatively large, correspondingly , the rewinding force of the coil spring is also larger. When the lock tongue is disengaged from the lock buckle, the webbing will obtain a higher acceleration under the rewinding force of the coil spring, so that the webbing is retracted into the retractor at a higher acceleration, which also makes the lock tongue have At a higher speed, it is easy for the lock tongue to collide with other parts in the car, causing other parts in the car to be damaged and worn due to the collision of the lock tongue, affecting the aesthetics of the car and reducing the user experience.

Related art provides a safety belt force reduction device. In this solution, the retractor is provided with a force reduction mechanism. The force reduction mechanism includes a force reduction wheel assembly, a drive motor and a control component. The force reduction wheel assembly is It is used to assist in pulling out or retrieving the webbing to control the speed of pulling out and retrieving the webbing, so that the webbing can be pulled out and retracted at a relatively stable speed, thereby preventing the lock tongue from colliding with the interior components of the vehicle.

The driving motor is used to provide power to the force reduction wheel assembly to make the force reduction wheel assembly operate. The control component is used to control the drive motor so that the motor rotates at a preset speed, thereby driving the force reduction wheel assembly to operate, so that the force reduction wheel component can control the pull-out and recovery speed of the webbing at a preset speed.

However, the above-mentioned solution requires the installation of a force-reducing wheel assembly, a driving motor and a control assembly. The structure is complex and the volume is large, causing the retractor to occupy a large space. In addition, the above solution also requires complex control procedures. During the long-term use of the seat belt device, as the application environment changes, for example, the elastic properties of the coil spring change, or the user grasps the webbing when untying it. Holding the lock tongue, slowly releasing the lock tongue, etc. will cause misjudgments in the control program, causing the force reduction mechanism to malfunction and reducing the reliability and stability of the seat belt force reduction device.

Based on the above problems, embodiments of the present application provide a retractor that can retract the webbing into the retractor at a relatively slow and steady speed, thereby effectively reducing or avoiding collisions between the lock tongue and vehicle interior components, and improving user experience.

Figure 2 is a schematic structural diagram of a retractor provided by an embodiment of the present application, and Figure 3 is an exploded schematic diagram of a retractor provided by an embodiment of the present application.

The embodiment of the present application provides a retractor 100, as shown in Figures 2 and 3. The retractor 100 includes a tape reel 10, a coil spring 20, a base 30 and a cover assembly 40, wherein the base 30 is used for It is connected to the frame 200 of the seat belt device 1 so that the retractor 100 can be connected to the device through the frame 200 . For example, the connection between the base 30 and the frame 200 can be realized through clamping, snapping or screw connection, or the connection between the base 30 and the frame 200 can also be realized through other methods.

The shell cover assembly 40 can be connected to the base 30 . For example, the shell cover assembly 40 and the base 30 can be detachably connected by snapping, snapping or threading. This can facilitate the disassembly of the shell cover assembly 40 and thus facilitate Repair and maintenance of retractor 100. Alternatively, the cover assembly 40 can also be connected to the base 30 in other ways.

As shown in FIG. 3 , the shell cover assembly 40 and the base 30 are jointly surrounded by an accommodating cavity 41 , and the coil spring 20 can be located in the accommodating cavity 41 . The outer ring end of the coil spring 20 can be connected to the shell cover assembly 40 To connect, the inner ring end of the coil spring 20 can be connected to the tape reel 10 . Specifically, one end of the tape reel 10 can be provided with a reel 11, a first through hole 31 can be opened in the center of the base 30, the reel 11 can pass through the first through hole 31 and fit with the first through hole 31, and the coil spring The inner ring end of 20 can be connected to the reel 11, so that the reel 10 can drive the coil spring 20 to elastically shrink when it rotates.

Among them, the reel 10 can be used to wind the webbing 300 in the seat belt device 1. When the user needs to fasten the seat belt, the webbing 300 can be pulled out of the retractor 100. At this time, the reel 10 is in the webbing. The coil spring 20 will rotate under the pull of the ribbon 300, and the coil spring 20 will also elastically deform under the driving of the reel 11, so that the coil spring 20 obtains a rewind force. As the length of the ribbon 300 increases, the coil spring 20 retracts. The rolling force will also gradually increase. When the locking tongue 400 on the webbing 300 is unlocked from the lock, the webbing drum 10 will rotate in the opposite direction under the rewinding force of the winding spring 20 , so that the webbing 300 is wound around the webbing drum 10 to complete the recycling of webbing 300.

The retractor 100 may also include a damping magnet 50, wherein the damping magnet 50 has a magnetic field. When the webbing 300 is retracted and the reel 10 is rotated, the reel 10 will cut the magnetic flux lines in the magnetic field, thereby causing the reel 10 to rotate. The reel 10 generates an induced electromotive force. According to Lenz's theorem (that is, the direction of the magnetic field of the induced current (electromotive force) always hinders the change of the magnetic flux causing the induced current (electromotive force)). In other words, the effect of the induced current (electromotive force) always opposes the induced current. (Cause of electromotive force), that is, the magnetic field direction of the induced electromotive force is opposite to the magnetic field direction of the damping magnet 50, so that the magnetic field of the damping magnet 50 can generate a damping force on the tape reel 10, and the damping force can hinder the tape reel 10 Rotate to hinder the retrieval of the webbing 300.

That is to say, in the embodiment of the present application, the damping magnet 50 is provided in the retractor 100, and the magnetic field of the damping magnet 50 provides a damping force to the reel 10, so that the damping force can hinder the recovery of the webbing 300. According to Lenz's theorem, The faster the tape reel 10 rotates (that is, the faster the tape reel 10 cuts the magnetic field lines), the greater the damping force exerted by the magnetic field on the tape reel 10 . When the lock tongue 400 is just released from the lock, the rewinding force of the coil spring 20 is relatively maximum, which can cause the webbing 300 to obtain a relatively maximum acceleration, thereby rapidly increasing the recovery speed of the webbing 300 (that is, the webbing drum 10 has (higher rotation speed), at this time, the magnetic field of the damping magnet 50 can exert a relatively large damping force on the tape reel 10, thereby effectively hindering the recovery of the webbing 300 and reducing the recovery speed of the webbing 300. As the rewinding force of the coil spring 20 decreases until it disappears, the recovery speed of the webbing 300 also gradually slows down (that is, the rotation speed of the tape drum 10 gradually slows down). At this time, the damping force of the magnetic field on the tape drum 10 also decreases. Relatively reduced, so that the webbing 300 can be retracted into the retractor 100 smoothly and slowly, so that the lock tongue 400 moves at a relatively smooth and slow speed throughout the entire process. This can effectively reduce or prevent the lock tongue 400 from colliding with other components in the car, prevent damage or wear of components in the car due to impact, thereby effectively improving user experience.

Compared with the related art in which the force reduction wheel assembly, the drive motor and the control assembly are used to achieve smooth and slow recovery of the webbing, the embodiment of the present application adds a damping magnet 50 to the retractor 100 to achieve the slow and smooth recovery of the webbing 300 without adding a complicated device. The structural components and control program can effectively simplify the overall structure of the retractor 100 and reduce the structural complexity of the retractor 100. In addition, the reliability and stability of the smooth recovery of the webbing 300 can also be improved.

The retractor 100 may be made of a metal material that is not attracted by magnets, such as copper, aluminum, aluminum alloy and other metal materials. In this way, when the retractor 100 rotates within the magnetic field, an induced magnetic field can be generated, so that the damping magnet 50 can provide damping force to the tape reel 10 .

Or, in some examples, the molding material of the tape reel 10 can also be a material that can be absorbed by magnets, such as iron, cobalt, nickel, and alloy materials of the above materials. Specifically, the molding material of the tape reel 10 can be Select settings according to specific scene requirements.

The damping magnet 50 may be a permanent magnet, or the damping magnet 50 may be a soft magnet, an electromagnet, or the like. Specifically, the type of damping magnet 50 can be selected and set according to specific scene requirements.

In a possible implementation manner, as shown in FIG. 3 , the damping magnet 50 can be disposed on the base 30 , and the damping magnet 50 can be located on the side of the base 30 facing the tape reel 10 , so that the distance between the tape reel 10 and the tape reel 10 can be shortened. The distance between the damping magnets 50 enables the tape reel 10 to effectively cut the magnetic flux lines in the magnetic field during rotation, so that the damping magnets 50 can provide damping force to the tape reel 10 .

Placing the damping magnet 50 directly on the base 30 can effectively simplify the overall structure of the retractor 100, reduce the workload of structural design of the retractor 100, and help improve work efficiency and reduce costs.

Figure 4 is a schematic structural diagram of another retractor provided by an embodiment of the present application.

Alternatively, in another possible implementation manner, as shown in FIG. 4 , the retractor 100 may further include a magnet seat 60 , the magnet seat 60 may be located in the accommodating cavity 41 , and the magnet seat 60 may be located on the back of the coil spring 20 To one side of the reel 10. The magnet seat 60 may be provided with a mounting hole 61 , and the damping magnet 50 may be disposed in the mounting hole 61 .

The retractor 100 may further include a current ring 70 and a coil spring cover 80 . Both the current ring 70 and the coil spring cover 80 may be located in the accommodation cavity 41 , wherein the current ring 70 may be located between the coil spring cover 80 and the damping magnet 50 , the current ring 70 can be connected with the tape reel 10, and when the tape reel 10 rotates, the current ring 70 can be driven to rotate together. In addition, the current ring 70 can also be along the axis direction of the tape reel 10 (that is, the x direction in the figure). )move.

When the webbing 300 is retracted, the tape reel 10 is driven by the coil spring 20 to rotate. At this time, the current ring 70 can move along the axis of the tape reel 10 toward the damping magnet 50 to be close to the damping magnet 50 . And the current ring 70 can rotate relative to the damping magnet 50 driven by the tape reel 10, so that the current ring 70 can cut the magnetic flux lines in the magnetic field, so that the damping magnet 50 can provide damping force to the current ring 70, that is, The magnetic field can provide a damping force to the reel 10 through the current loop 70 .

The coil spring cover 80 can be connected to the shell cover assembly 40 , and the coil spring cover 80 can be located on the side of the coil spring 20 facing away from the base 30 . The molding material of the coil spring cover 80 can be an insulating material, such as resin material, etc. The coil spring cover 80 can isolate the current ring 70 and the coil spring 20 to prevent the coil spring cover 80 from electrically contacting the current ring 70 and affecting the current. The damping force of ring 70.

When the webbing 300 is in the early stages of recovery (that is, when the recovery speed of the webbing 300 increases rapidly), the current loop 70 may move toward the damping magnet 50 to approach the magnetic field of the damping magnet 50 . At this time, when the tape reel 10 drives the current ring 70 to rotate, the current ring 70 can cut relatively more magnetic induction lines, so that the magnetic field can provide higher damping force to the current ring 70 to hinder the rotation of the current ring 70 . In this way, the magnetic field can provide damping force to the tape drum 10 through the current ring 70, so that the current ring 70 can drive the tape drum 10 to significantly slow down the rotation speed, so that the webbing 300 can significantly reduce the recovery speed, so that the webbing 300 can be When the starting speed is the highest, a higher damping force can be obtained, thereby effectively reducing the recovery speed of the webbing 300 and improving the slowness and smoothness of the recovery of the webbing 300.

When the recovery of the webbing 300 is coming to an end, the speed of the webbing 300 decreases, and the webbing 300 does not need excessive damping force to hinder its recovery. At this time, the current loop 70 can move toward the reel drum 10 (that is, away from the damping magnet 50). , thereby reducing the damping force of the magnetic field on the current loop 70, so that the webbing 300 can be smoothly recovered into the retractor 100, thereby effectively improving the stability of the recovery of the webbing 300.

The molding material of the current ring 70 may be a metal material that is not attracted by magnets, such as copper, aluminum, aluminum alloy and other metal materials.

Alternatively, in some examples, the molding material of the current ring 70 may also be a material that can be adsorbed by magnets, such as iron, cobalt, nickel, and alloy materials of the above materials. Specifically, the molding material of the current ring 70 may be made according to specific requirements. Scenario requirement selection settings.

In this way, when the current loop 70 moves in the magnetic field, it can generate an induced electromotive force, so that the magnetic field can provide a damping force to the current loop 70 .

It should be understood that the current loop and the tape reel may be made of the same molding material, or they may be different.

FIG. 5 is a schematic structural diagram of a current loop provided by an embodiment of the present application, and FIG. 6 is a schematic structural diagram of a connector provided by an embodiment of the present application.

Continuing to refer to FIG. 4 , the retractor 100 may further include a connecting member 90 , and the connecting member 90 may include a connecting shaft 91 and a contact portion 92 located at one end of the connecting shaft 91 . The connecting shaft 91 can pass through the current ring 70 and the coil spring cover 80 in sequence and be connected to the reel 11 of the tape reel 10 , and the abutment portion 92 can abut against the current ring 70 .

The connecting shaft 91 and the current ring 70 may be connected by a snap-in connection. For example, as shown in FIGS. 5 and 6 , a snap-in hole 71 may be provided on the current ring 70 , and a snap-in hole 71 may be provided on the outer periphery of the connecting shaft 91 . The clamping portion 911 cooperates with the clamping hole 71 , and the connection shaft 91 and the current ring 70 can be connected through the cooperation of the clamping hole 71 and the clamping portion 911 . When the connecting shaft 91 rotates, the current ring 70 can rotate together with the connecting shaft 91 under the cooperation of the clamping hole 71 and the clamping portion 911 .

The connecting shaft 91 and the coil spring cover 80 may be rotatably connected. For example, the coil spring cover 80 may be provided with a third through hole 81 (see FIG. 4 ), and there may be a clearance fit between the connecting shaft 91 and the third through hole 81 , so that the connecting shaft 91 can be relative to the coil spring cover. 80 turns.

Among them, the connecting shaft 91 and the reel 11 can be connected by a snap connection, and there can be a gap fit between the connecting shaft 91 and the reel 11. The reel 11 can drive the connecting shaft 91 to rotate together, and the connecting shaft 91 can also be relative to the reel. 11 moves, wherein the moving direction of the connecting shaft 91 can be parallel to the axis of the tape reel 10 (that is, the x direction in FIG. 4).

When the webbing 300 is retracted and the reel 10 is rotated, the reel 11 can drive the connecting shaft 91 to rotate, and the connecting shaft 91 can move along the axis of the reel 10 . In this way, the current ring 70 can be driven by the connecting shaft 91 to rotate together, and the connecting shaft 91 can also drive the current ring 70 to move toward the damping magnet 50 . This allows the current loop 70 to cut more magnetic induction lines, so that the magnetic field provides greater damping force to the current loop 70 to reduce the rotational speed of the tape reel 10 and slow down the recovery speed of the webbing 300 .

In addition, when the recovery of the webbing 300 is nearing the end, the connecting shaft 91 can drive the current loop 70 to move toward the reel 10 to reduce the damping force of the magnetic field on the current loop 70 so that the webbing 300 can be smoothly recovered into the retractor 100 .

Figure 7 is a schematic structural diagram of a connector provided by an embodiment of the application from another perspective. Figure 8 is a schematic structural diagram of a tape reel provided by an embodiment of the application. Figure 9 is a schematic structural diagram of a tape reel provided by an embodiment of the application. A schematic structural diagram of the tape reel from another perspective. FIG. 10 is a schematic structural diagram of a connector and the tape reel provided in an embodiment of the present application. FIG. 11 is an enlarged view of area A in FIG. 10 .

As shown in Figure 7, the connecting shaft 91 has a limiting groove 912 at one end facing away from the abutment portion 92. As shown in Figures 8 and 9, the outer periphery of the reel 11 has a limiting portion 12 that fits with the limiting groove 912. The limiting portion 12 can be inserted into the limiting groove 912 . A second through hole 913 may be opened at the bottom of the limiting groove 912 , and the reel 11 may pass through the second through hole 913 and be rotationally connected to the shell cover assembly 40 .

There is a first inclined surface 121 on the limiting part 12, and a second inclined surface 9121 matching the first inclined surface 121 is provided in the limiting groove 912. When the tape reel 10 rotates, the limiting part 12 can pass through the first inclined surface 121 and The cooperation of the second inclined surface 9121 drives the connecting shaft 91 to rotate, and can also push the connecting shaft 91 to move along the axis of the tape reel 10 .

Specifically, as shown in FIG. 10 and FIG. 11 , when the tape drum 10 drives the reel 11 to rotate, the limiting portion 12 can exert a thrust F on the connecting shaft 91 at the first inclined surface 121 , and the direction of the thrust F is The normal direction of the first inclined surface 121 . According to the decomposition principle of force, the thrust F can be decomposed into mutually perpendicular F1 and F2, where the direction of F1 can be parallel to the axis of the connecting shaft 91 (that is, the axis direction x of the reel 10 in Figure 11), and the direction of F2 It can be parallel to the radial direction of the connecting shaft 91 . In this way, the force F2 parallel to the radial direction of the connecting shaft 91 can push the connecting shaft 91 to rotate, and the force F1 parallel to the axial direction of the connecting shaft 91 can push the connecting shaft 91 to move along the axis of the tape reel 10 . Thereby, the connecting shaft 91 can drive the current ring 70 to move toward the damping magnet 50 to increase the amount of cutting of the magnetic induction line by the current ring 70 and increase the damping force generated by the magnetic field on the current ring 70, thereby effectively hindering the recovery of the webbing 300 and reducing the tension of the webbing 300. recycling speed.

FIG. 12 is a schematic structural diagram of a connector provided by an embodiment of the present application from another perspective. FIG. 13 is a schematic structural diagram of a connector provided by an embodiment of the present application that cooperates with a shell cover assembly.

Referring to Figures 12 and 13, a through slot 62 can be opened in the center of the magnet seat 60, and a protruding elastic body 921 is provided on the side of the contact portion 92 facing away from the connecting shaft 91. The contact portion 92 can It passes through the through slot 62 and abuts against the shell cover assembly 40 through the elastic body 921 . When the connecting shaft 91 moves toward the damping magnet 50 driven by the limiting portion 12 , the contact portion 92 is driven by the connecting shaft 91 and moves toward the shell cover assembly 40 and abuts against the shell cover assembly 40 . In this way, the elastic body 921 can provide a certain buffering effect on the contact portion 92 , reduce or avoid the rigid impact between the contact portion 92 and the cover assembly 40 , and prevent abnormal noise caused by the rigid impact between the contact portion 92 and the cover assembly 40 .

In addition, the elastic body 921 also helps to return the connecting piece 90. When the webbing 300 completes the recovery, the tape drum 10 stops rotating, and the thrust F of the limiting part 12 on the connecting shaft 91 also disappears accordingly. At this time, the connection The member 90 can move toward the direction of the tape reel 10 under the elastic force of the elastic body 921, so that the current loop 70 can move away from the damping magnet 50, and the connecting member 90 can be restored to its original position, completing the return of the connecting member 90.

Figure 14 is an exploded schematic diagram of a shell cover assembly provided by an embodiment of the present application.

Referring to FIG. 14 , the shell cover assembly 40 may include a first side wall 42 , a second side wall 43 and a top cover 44 that are connected in sequence. The first side wall 42 may be connected to the base 30 , and the second side wall 43 may be connected to the base 30 . is located between the first side wall 42 and the top cover 44 . The first side wall 42 may be surrounding the outer periphery of the coil spring 20 , the second side wall 43 may be surrounding the outer periphery of the magnet seat 60 , and the reel 11 may be rotatably connected to the top cover 44 .

The first side wall 42 , the second side wall 43 and the top cover 44 can be detachably connected. For example, the first side wall 42 , the second side wall 43 and the top cover 44 can be connected by snap-fitting. , buckle connection, thread connection and other methods to achieve detachable connection. This can facilitate the disassembly of the shell cover assembly 40 of the retractor 100. When the retractor 100 fails, it can be more convenient to disassemble the coil spring 20, the magnet seat 60, the current ring 70, etc., and facilitate the maintenance and repair of the retractor 100. Maintenance will help extend the service life of the retractor 100.

FIG. 15 is an exploded schematic diagram of the cooperation between the magnet seat and the second side wall provided by the embodiment of the present application.

Referring to FIG. 15 , in the embodiment of the present application, the second side wall 43 and the magnet seat 60 can be connected in a movable manner, and the moving direction of the magnet seat 60 can be parallel to the axis of the tape reel 10 . For example, the inner wall of the second side wall 43 can be provided with internal threads 431, and the outer wall of the magnet seat 60 can be provided with external threads 63 that match the internal threads 431. The magnet seat 60 and the second side wall 43 can pass through the inner threads 431. The thread 431 cooperates with the external thread 63 to perform a removable connection. By controlling the length of the threaded fit between the magnet seat 60 and the second side wall 43 (that is, the length along the x direction in FIG. 15 ), the position of the magnet seat 60 along the axis of the reel 10 can be controlled, thereby controlling the magnet seat. 60 and the current loop 70.

For different car models, the distance between the guide ring 500 and the retractor 100 in the seat belt device 1 is different. For example, the distance between the guide ring 500 and the retractor 100 in a small car is relatively short, and the corresponding webbing The 300 pull length is also relatively short. In large trucks, the distance between the guide ring 500 and the retractor 100 is relatively large, and the corresponding length of the webbing 300 pulled out from the retractor 100 is also longer, so that the elastic deformation of the coil spring 20 is also larger. The rewinding force of the corresponding coil spring 20 is also larger.

For large trucks, when the webbing 300 is recycled, the recycling speed is relatively high. At this time, the relative position between the magnet seat 60 and the current ring 70 can be controlled to make the magnet seat 60 as close as possible to the current ring 70. That is, the current loop 70 is brought close to the damping magnet 50 so that the current loop 70 can cut more magnetic induction lines when rotating, so that the magnetic field can provide greater damping force to the current loop 70, thereby effectively reducing the recovery speed of the webbing 300. .

For a small car, the distance between the guide ring 500 and the retractor 100 is relatively short, the length of the corresponding webbing 300 pulled out is also relatively short, and the rewinding force of the corresponding coil spring 20 is also relatively small. At this time, the position of the magnet seat 60 can be controlled to appropriately increase the distance between the magnet seat 60 and the current loop 70 , thereby reducing the damping force of the magnetic field on the current loop 70 so that the webbing 300 can be recovered at a more reasonable speed. In this way, the retractor 100 can meet the application requirements of different vehicle models, and the flexibility of the retractor 100 can be effectively improved.

In the embodiment of the present application, as shown in FIG. 16 , the number of damping magnets 50 may be multiple, and the multiple damping magnets 50 may be distributed around the axis of the tape reel 10 , for example, when the damping magnets 50 are disposed on the base 30 , the damping magnet 50 may be disposed around the center of the base 30 . When the damping magnet 50 is disposed on the magnet base 60 , the damping magnet 50 may be disposed around the center of the magnet base 60 . In this way, the magnetic field intensity of the damping magnet 50 can be increased, which is beneficial to improving the damping force of the magnetic field on the tape reel 10 .

Continuing to refer to FIG. 16 , the N-S poles of two adjacent damping magnets 50 can be placed in opposite directions. For example, taking two adjacent damping

magnets

50 a and 50 b as an example, the N pole of the damping magnet 50 a It can be located at an end close to the tape reel 10 , and its S pole can be located at an end far away from the tape reel 10 . The N pole of the damping magnet 50 b may be located at an end far away from the tape reel 10 , and its S pole may be located at an end close to the tape reel 10 . In this way, magnetic flux lines can also be generated between the N-S poles of two adjacent damping magnets 50, which is beneficial to further increasing the intensity of the magnetic field, thereby effectively increasing the damping force of the magnetic field on the reel 10.

Each embodiment or implementation mode in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between various embodiments can be referred to each other.

In the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like is intended to be in conjunction with the description of the embodiments. or examples describe specific features, structures, materials, or characteristics that are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. scope.

Claims

A retractor used in a safety belt device, which is characterized in that it includes a belt reel, a coil spring, a base and a shell cover assembly, the base is used to connect with the frame of the safety belt device, and the shell cover The assembly is connected to the base, the base and the shell cover assembly together form an accommodation cavity, and the coil spring is located in the accommodation cavity;

The tape reel is used to wind the webbing in the safety belt device. One end of the tape reel is provided with a reel. A first through hole is opened in the center of the base. The reel passes through the first through hole. The through hole is clearance matched with the first through hole, the inner ring end of the coil spring is connected to the reel, and the outer coil end of the coil spring is connected to the shell cover assembly;

It also includes a damping magnet, the damping magnet has a magnetic field, the magnetic field is used to provide a damping force to the tape reel, and the damping force is used to hinder the retrieval of the webbing.
The retractor according to claim 1, wherein the damping magnet is disposed on the base, and the damping magnet is located on a side of the base facing the tape reel.
The retractor according to claim 1, further comprising a magnet seat, the magnet seat is located in the accommodation cavity, and the magnet seat is located on the side of the coil spring facing away from the tape reel. On one side, the magnet seat is provided with a mounting hole, and the damping magnet is located in the mounting hole;

It also includes a current ring and a coil spring cover located in the accommodation cavity, the coil spring cover is connected to the shell cover assembly, and the coil spring cover is located on the side of the coil spring facing away from the base;

The current loop is connected to the tape reel, and the current loop is located between the coil spring cover and the damping magnet. When the webbing is retracted, the current loop moves toward the direction of the damping magnet. And rotates relative to the damping magnet, and the magnetic field of the damping magnet provides damping force to the tape reel through the current loop.
The retractor according to claim 3, further comprising a connecting member, the connecting member includes a connecting shaft and an abutment portion located at one end of the connecting shaft, and the connecting shaft passes through the current ring in sequence. and the coil spring cover and connected with the reel;

The contact portion is in contact with the current ring, the connecting shaft is snap-fitted with the current ring, and the connecting shaft is rotationally connected with the coil spring cover;

When the webbing is retracted, the connecting shaft drives the current ring to rotate and move toward the damping magnet.
The retractor according to claim 4, wherein a limiting groove is provided at one end of the connecting shaft facing away from the abutting portion, and a limiting groove is provided on the outer periphery of the reel to fit with the limiting groove. The limiting part is inserted into the limiting groove, and a second through hole is provided at the bottom of the limiting groove. The reel passes through the second through hole and rotates with the shell cover assembly. connect;

The limiting portion has a first inclined surface, and the limiting groove has a second inclined surface matching the first inclined surface. When the tape reel rotates, the limiting portion passes through the first inclined surface. The cooperation between the inclined surface and the second inclined surface drives the connecting shaft to rotate and pushes the connecting shaft to move along the axis of the tape reel.
The retractor according to claim 4 or 5, characterized in that a through groove is opened in the center of the magnet seat, and the side of the contact portion facing away from the connecting shaft has a protruding elastic body. The contact portion passes through the through slot and contacts the shell cover assembly through the elastic body.
The retractor according to any one of claims 3-5, wherein the shell cover assembly includes a first side wall, a second side wall and a top cover connected in sequence, and the first side wall and the The base is connected, and the second side wall is located between the first side wall and the top cover;

The first side wall is arranged around the outer periphery of the coil spring, the second side wall is arranged around the outer periphery of the magnet seat, and the reel is rotationally connected to the top cover.
The retractor according to any one of claims 7, wherein the inner wall of the second side wall has internal threads, and the outer wall of the magnet seat has external threads that cooperate with the internal threads;

The magnet seat and the second side wall are movably connected through the cooperation of the internal thread and the external thread, and the moving direction of the magnet seat is parallel to the axis of the tape reel.
The retractor according to any one of claims 1 to 5, characterized in that the number of the damping magnets is multiple, and the plurality of damping magnets are distributed around the axis of the tape reel.
The retractor according to claim 9, characterized in that the N-S poles of two adjacent damping magnets are placed in opposite directions.
A safety belt device, characterized in that it includes at least a frame, a webbing, a lock tongue and the retractor according to any one of the above claims 1-10;

The retractor is arranged on the frame, the webbing is wound on the tape reel, and the locking tongue is arranged on the webbing.
An equipment, characterized in that it at least includes the safety belt device according to claim 11, and the safety belt device is arranged on the equipment through the frame.