Safety belt control device, safety belt assembly and vehicle

Abstract

The utility model provides a safety belt control device, a safety belt assembly and a vehicle, and the safety belt control device comprises a core shaft which is connected with one end of a safety belt and provides rolling force for the safety belt; the main coil spring assembly is located on one side of the mandrel and connected with the mandrel. The auxiliary coil spring assembly is located on the side, away from the mandrel, of the main coil spring assembly. The switching assembly comprises an auxiliary coil spring assembly locking working condition and an auxiliary coil spring assembly unlocking working condition, under the auxiliary coil spring locking working condition, the switching assembly abuts against the auxiliary coil spring assembly, the main coil spring assembly is disconnected from the auxiliary coil spring assembly, and the main coil spring assembly provides winding force for the safety belt for the mandrel; under the working condition that the auxiliary coil spring assembly is unlocked, abutting connection between the switching assembly and the auxiliary coil spring assembly is relieved, the main coil spring assembly and the auxiliary coil spring assembly are connected and jointly provide winding force for the safety belt for the mandrel, and the safety belt control device achieves dynamic adjustment of the recovery force of the safety belt through cooperative work of the main coil spring assembly, the auxiliary coil spring assembly and the switching assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety belt intelligent control, and in particular to a safety belt control device, a safety belt assembly and a vehicle. BACKGROUND

[0002] As a safety component used most frequently in daily life, a safety belt is generally retracted and released through a coil spring assembly and a retractor. In order to ensure good retraction of the safety belt, a double coil spring assembly is often selected. However, after being mounted in a real vehicle, long-time wearing of the safety belt by an occupant will cause compression to the chest and shoulders of the occupant, thereby reducing the comfort experience of the occupant. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a safety belt control device, a safety belt assembly and a vehicle to solve the problem of occupant discomfort caused by a too-tight safety belt.

[0004] A safety belt control device comprises:

[0005] a mandrel connected to one end of a safety belt and providing a winding force for the safety belt;

[0006] a main coil spring assembly located on one side of the mandrel and connected to the mandrel;

[0007] a secondary coil spring assembly located on the side of the main coil spring assembly away from the mandrel;

[0008] a switching assembly including a locked secondary coil spring assembly working condition and an unlocked secondary coil spring assembly working condition, in the locked secondary coil spring assembly working condition, the switching assembly abuts against the secondary coil spring assembly, the main coil spring assembly is disconnected from the secondary coil spring assembly, and the main coil spring assembly provides the winding force for the mandrel; in the unlocked secondary coil spring assembly working condition, the switching assembly is disconnected from the secondary coil spring assembly, the main coil spring assembly is connected to the secondary coil spring assembly, and the main coil spring assembly and the secondary coil spring assembly jointly provide the winding force for the mandrel.

[0009] Optionally, the main coil spring assembly comprises a main coil spring and a first transmission shaft, a tightening end of the main coil spring is connected to the periphery of the first transmission shaft, the secondary coil spring assembly comprises a secondary coil spring and a second transmission shaft, a tightening end of the secondary coil spring is connected to the periphery of the second transmission shaft, and the first transmission shaft is arranged opposite to the second transmission shaft;

[0010] In the switching assembly locking sub-spring assembly working condition, the first transmission shaft is disconnected from the second transmission shaft, and the main spring assembly provides the winding force to the core shaft through the first transmission shaft; in the switching assembly unlocking sub-spring assembly working condition, the first transmission shaft is connected to the second transmission shaft, and the main spring assembly and the sub-spring assembly jointly provide the winding force to the core shaft through the first transmission shaft and the second transmission shaft.

[0011] Optionally, an electromagnetic clutch is arranged between the first transmission shaft and the second transmission shaft, a driving part of the electromagnetic clutch is arranged at one end of the first transmission shaft, and a driven part of the electromagnetic clutch is arranged at one end of the second transmission shaft.

[0012] Optionally, the switching assembly comprises a ratchet pawl and a driving mechanism connected to each other, the sub-spring assembly further comprises a ratchet wheel connected to the sub-spring, and the driving mechanism drives the ratchet pawl to abut against or be disengaged from the ratchet wheel.

[0013] Optionally, the ratchet pawl comprises a connecting part and a clamping part, one end of the connecting part is connected to an output shaft of the driving mechanism, the other end of the connecting part is connected to the clamping part, and the driving mechanism drives the clamping part to move close to or away from the ratchet wheel through the connecting part, so as to drive the clamping part to abut against or be disengaged from the ratchet wheel.

[0014] Optionally, the safety belt length measuring assembly comprises a permanent magnet ring and a sensor, the permanent magnet ring is sleeved on the periphery of the core shaft, and the sensor is opposite to the position of the permanent magnet ring, so that the sensor measures the extension length of the safety belt according to the number of rotations of the permanent magnet ring on the core shaft, and the sensor is further connected to the switching assembly, so that the switching assembly switches between the locking sub-spring assembly working condition and the unlocking sub-spring assembly working condition according to the extension length of the safety belt.

[0015] Optionally, the main spring comprises a main spring body and a first mounting shell, the main spring body is located in the first mounting shell, the first transmission shaft penetrates through the first mounting shell and is rotationally connected to the first mounting shell, one end of the main spring body is connected to the periphery of the first transmission shaft as a tightening end, and the other end of the main spring body is connected to the first mounting shell; the sub-spring comprises a sub-spring body and a second mounting shell, the sub-spring body is located in the second mounting shell, the second transmission shaft penetrates through the second mounting shell and is rotationally connected to the second mounting shell, one end of the sub-spring body is connected to the periphery of the second transmission shaft as a tightening end, and the other end of the sub-spring body is connected to the second mounting shell.

[0016] Optionally, a housing is further included, the main coil spring assembly and the auxiliary coil spring assembly are located in the housing, the first mounting shell and the second mounting shell are fixedly connected with the housing, and the housing is provided with a limiting hole on a side close to the auxiliary coil spring assembly, and the second transmission shaft penetrates through the limiting hole and is rotationally connected with the limiting hole.

[0017] Based on the same inventive concept, the disclosure further provides a safety belt assembly comprising the safety belt control device and a safety belt, and the safety belt is connected to the safety belt control device.

[0018] Based on the same inventive concept, the disclosure further provides a vehicle comprising the safety belt assembly.

[0019] As can be seen from the above, the safety belt control device provided by the application comprises a mandrel, a main coil spring assembly, an auxiliary coil spring assembly and a switching assembly, the main coil spring assembly is the main power source for safety belt recovery, the auxiliary coil spring assembly serves as a supplement to the main coil spring assembly, the switching assembly controls the main coil spring assembly to work cooperatively with the main coil spring assembly under a specific working condition to provide additional winding force for the safety belt, the switching assembly has two working conditions of locking and unlocking the auxiliary coil spring assembly, under the locking working condition, the switching assembly abuts against the auxiliary coil spring assembly, the main coil spring assembly is disconnected from the auxiliary coil spring assembly, and only the main coil spring assembly provides winding force for the mandrel, so that the winding force of the safety belt can be reduced; under the unlocking working condition, the switching assembly is disconnected from the auxiliary coil spring assembly, the main coil spring assembly and the auxiliary coil spring assembly are connected and jointly provide winding force for the mandrel, so that the winding force of the safety belt is increased. In summary, through the cooperative work of the main coil spring assembly, the auxiliary coil spring assembly and the switching assembly, the safety belt control device realizes dynamic adjustment of the safety belt recovery force, ensures safety performance and significantly improves the comfort of the occupant. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art descriptions. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 The cross-sectional view of the main coil spring assembly and the auxiliary coil spring assembly is shown for the embodiments of the application.

[0022] Figure 2 The schematic view of the permanent magnet ring is shown for the embodiments of the application.

[0023] Reference signs: 01, safety belt; 1, mandrel; 11, support; 2, main spring assembly; 21, main spring; 211, main spring body; 212, first mounting shell; 22, first transmission shaft; 3, auxiliary spring assembly; 31, auxiliary spring; 311, auxiliary spring body; 312, second mounting shell; 32, second transmission shaft; 33, ratchet; 4, switching assembly; 41, pawl; 411, connecting part; 412, engagement part; 42, driving mechanism; 43, return spring; 5, housing; 51, limiting hole; 6, safety belt length measurement assembly; 61, permanent magnet ring; 62, sensor. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present application clearer, the present application is further described in detail below with reference to specific embodiments and with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used in the embodiments of the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like only represent relative positional relationships, which can change when the absolute positions of the described objects change.

[0026] Based on the background, as one of the most critical and frequently used components in vehicle safety systems, the main function of the safety belt is to reduce the risk of collision between the passenger and the hard objects in the vehicle by restraining the movement of the passenger's body when the vehicle collides or brakes suddenly, thereby effectively reducing the degree of injury. In order to realize the automatic winding and unwinding function of the safety belt, the combination design of the spring assembly and the retractor is commonly used in modern vehicles. The spring assembly tightens and recovers the safety belt through elastic force, while the retractor is responsible for controlling the release and locking of the safety belt, ensuring that the passenger can be quickly fixed in an emergency.

[0027] To ensure effective seatbelt retraction and prevent safety hazards caused by slack or jamming, many vehicles employ a dual-coil spring assembly design. By increasing spring force and using redundant design, the dual-coil spring assembly can more effectively retract the seatbelt, maintaining high retraction performance even after multiple uses. However, this design has certain limitations in practical applications. For occupants, the greater retraction force provided by the dual-coil spring assembly may cause the seatbelt to remain tightly pressed against the chest and shoulders for extended periods, increasing pressure and discomfort, especially during long drives or extended journeys, thus reducing occupant comfort.

[0028] Furthermore, as people's demands for vehicle ride comfort continue to increase, seat belt design not only needs to meet basic safety performance but also needs to consider occupant comfort. While traditional double-coil spring assemblies can effectively ensure seat belt retraction, their high tension adjustment range is limited. The tightness of the seat belt may affect the occupant's riding experience, and may even lead some occupants to choose not to wear seat belts at low speeds, thereby increasing potential safety risks.

[0029] Therefore, how to reduce pressure on the occupant's chest and shoulders and improve wearing comfort while ensuring good seat belt retraction has become an important issue in current seat belt design.

[0030] The following is in conjunction with the appendix Figures 1-2 The embodiments of this application will be described in detail below.

[0031] like Figure 1 and Figure 2 As shown, a seatbelt control device includes:

[0032] Mandrel 1, which is connected to one end of seat belt 01 and provides winding force to seat belt 01;

[0033] The main coil spring assembly 2 is located on one side of the mandrel 1 and is connected to the mandrel 1;

[0034] The auxiliary coil spring assembly 3 is located on the side of the main coil spring assembly 2 away from the spindle 1;

[0035] The switching component 4 includes a locked secondary coil spring assembly 3 working condition and an unlocked secondary coil spring assembly 3 working condition. In the locked secondary coil spring assembly 3 working condition, the switching component 4 abuts against the secondary coil spring assembly 3, the main coil spring assembly 2 is disconnected from the secondary coil spring assembly 3, and the main coil spring assembly 2 provides the mandrel 1 with the winding force on the seat belt 01. In the unlocked secondary coil spring assembly 3 working condition, the switching component 4 is disconnected from the secondary coil spring assembly 3, the main coil spring assembly 2 is connected to the secondary coil spring assembly 3, and together they provide the mandrel 1 with the winding force on the seat belt 01.

[0036] Specifically, the core shaft 1 is provided with a support 11 on both sides, which can be connected to the vehicle body structure through fixing bolts to provide stable support for the core shaft 1. The core shaft 1 is rotatably connected to the supports 11 on both sides through bearings or shaft sleeves, so that the core shaft 1 can rotate freely to realize the winding and unwinding function of the safety belt 01. One end of the safety belt 01 is wound around the core shaft 1, and the other end extends to the safety belt buckle or anchor point. The safety belt 01 is wound and unwound by the rotation of the core shaft 1. The core shaft 1 is also provided with a locking mechanism that triggers when the vehicle brakes or collides, preventing the core shaft 1 from continuing to rotate, thereby locking the safety belt 01 to prevent the occupant from moving forward due to inertia. The main spring assembly 2 is fixedly installed on the support 11, and the main spring assembly 2 is located on one side of the core shaft 1 and is directly connected to the core shaft 1, which is the main power source for the safety belt 01 to be retracted. When the safety belt 01 is pulled out, the main spring assembly 2 stores elastic potential energy; when the safety belt 01 is released, the main spring assembly 2 releases potential energy to drive the core shaft 1 to rotate and retract the safety belt 01. The auxiliary spring assembly 3 is located on the side away from the core shaft 1 of the main spring assembly 2, and serves as a supplement to the main spring assembly 2, working together with the main spring assembly 2 under certain working conditions to provide additional winding force for the safety belt 01. The switching assembly 4 is used to control whether the auxiliary spring 31 works together with the main spring assembly 2, which includes two working conditions: locking the auxiliary spring assembly 3 working condition and unlocking the auxiliary spring assembly 3 working condition. In the locking condition, the switching assembly 4 abuts against the auxiliary spring assembly 3 to prevent the auxiliary spring assembly 3 from releasing elastic force. At this time, the main spring assembly 2 is disconnected from the auxiliary spring assembly 3, and only the main spring assembly 2 provides winding force for the core shaft 1. This working condition is suitable for situations where the safety belt 01 has low retraction force requirements to avoid excessive retraction force causing discomfort to the occupant. In the unlocking condition, the switching assembly 4 is disengaged from the auxiliary spring assembly 3, and the main spring assembly 2 is connected to the auxiliary spring assembly 3 to provide winding force for the core shaft 1 together. This working condition is suitable for situations where the safety belt 01 has high retraction force requirements to ensure that the safety belt 01 can be effectively retracted and kept close to the occupant's body in emergency situations.

[0037] In this embodiment, the safety control device includes a spindle 1, a main coil spring assembly 2, a secondary coil spring assembly 3, and a switching assembly 4. The main coil spring assembly 2 is the main power source for the retraction of the seat belt 01. The secondary coil spring assembly 3 serves as a supplement to the main coil spring assembly 2. The switching assembly 4 controls the main coil spring assembly 2 to work in conjunction with it under specific working conditions, providing additional winding force to the seat belt 01. The switching assembly 4 has two working states: locking and unlocking the secondary coil spring assembly 3. In the locked state, the switching assembly 4 abuts against the secondary coil spring assembly 3, and the main coil spring assembly 2 is disconnected from the secondary coil spring assembly 3. Only the main coil spring assembly 2 provides winding force to the spindle 1, which reduces the winding force of the seat belt 01. In the unlocked state, the switching assembly 4 is disconnected from the secondary coil spring assembly 3. The main coil spring assembly 2 and the secondary coil spring assembly 3 are connected and jointly provide winding force to the spindle 1, increasing the winding force of the seat belt 01. In summary, this seat belt control device, through the coordinated operation of the main coil spring assembly 2, the auxiliary coil spring assembly 3, and the switching assembly 4, achieves dynamic adjustment of the seat belt 01 retraction force, significantly improving occupant comfort while ensuring safety performance.

[0038] In some embodiments, such as Figure 1 As shown, the main coil spring assembly 2 includes a main coil spring 21 and a first drive shaft 22. The tightening end of the main coil spring 21 is connected to the periphery of the first drive shaft 22. The auxiliary coil spring assembly 3 includes an auxiliary coil spring 31 and a second drive shaft 32. The tightening end of the auxiliary coil spring 31 is connected to the periphery of the second drive shaft 32. The first drive shaft 22 and the second drive shaft 32 are arranged opposite to each other.

[0039] When the switching component 4 locks the secondary coil spring assembly 3, the first drive shaft 22 is disconnected from the second drive shaft 32, and the main coil spring assembly 2 provides the mandrel 1 with a winding force on the seat belt 01 through the first drive shaft 22; when the switching component 4 unlocks the secondary coil spring assembly 3, the first drive shaft 22 is connected to the second drive shaft 32, and the main coil spring assembly 2 and the secondary coil spring assembly 3 jointly provide the mandrel 1 with a winding force on the seat belt 01 through the first drive shaft 22 and the second drive shaft 32.

[0040] In addition, an electromagnetic clutch is provided between the first drive shaft 22 and the second drive shaft 32, with the driving part located at one end of the first drive shaft 22 and the driven part located at one end of the second drive shaft 32.

[0041] Specifically, the main spring assembly 2 includes a main spring 21 and a first transmission shaft 22. The tightening end of the main spring 21 can be welded on the periphery of the first transmission shaft 22, or can be tightly connected to the periphery of the first transmission shaft 22 through a high-precision riveting process. The riveting positions are uniformly distributed to tightly and firmly connect the tightening end of the main spring 21 to the periphery of the first transmission shaft 22, ensuring that there is no relative sliding between the tightening end of the main spring 21 and the first transmission shaft 22 during long-term use, thereby ensuring the stability of power transmission. The auxiliary spring assembly 3 includes an auxiliary spring 31 and a second transmission shaft 32. The tightening end of the auxiliary spring 31 can also be welded on the periphery of the second transmission shaft 32, or can also be tightly connected to the periphery of the first transmission shaft 22 through a high-precision riveting process, ensuring that there is no relative sliding between the tightening end of the auxiliary spring 31 and the first transmission shaft 22 during long-term use, thereby ensuring the stability of power transmission. The main spring 21 and the auxiliary spring 31 are made of high-strength spring steel material, have excellent elasticity and fatigue resistance, and can maintain stable performance during multiple winding and releasing cycles. In addition, the main spring 21 and the auxiliary spring 31 are provided with a dense reinforcing layer, which not only improves the elastic limit of the main spring 21, but also enhances its fatigue resistance. The first transmission shaft 22 and the second transmission shaft 32 are arranged opposite to each other and connected or disconnected by an electromagnetic clutch. The electromagnetic clutch can realize quick and accurate engagement and separation of the first transmission shaft 22 and the second transmission shaft 32. The driving part of the electromagnetic clutch is arranged at one end of the first transmission shaft 22, and the driven part is arranged at one end of the second transmission shaft 32. When the electromagnetic clutch is powered on, a strong magnetic force is generated between the driving part and the driven part, causing them to tightly combine, thereby realizing the connection of the first transmission shaft 22 and the second transmission shaft 32, so that the main spring assembly 2 and the auxiliary spring assembly 3 work cooperatively. When the electromagnetic clutch is powered off, the magnetic force disappears, the electrical connection between the driving part and the driven part of the electromagnetic clutch is released, the force transmission between the first transmission shaft 22 and the second transmission shaft 32 disappears, and the auxiliary spring assembly 3 stops working, only the main spring assembly 2 provides the winding force for the safety belt 01. In order to further improve the safety of the system, the main spring assembly 2 and the auxiliary spring assembly 3 are respectively provided with overload protection devices. When the winding force exceeds the set safety threshold, the overload protection device will automatically start to release part of the energy of the spring or limit the rotation of the spring, avoiding damage to the spring due to overload, and also protecting the safety of the safety belt 01 and the entire system.

[0042] In the present embodiment, the first transmission shaft 22 and the second transmission shaft 32 are connected or disconnected by an electromagnetic clutch, ensuring smooth switching between the unlocking and locking conditions of the auxiliary spring 31. The connection between the first transmission shaft 22 and the second transmission shaft 32 through the electromagnetic clutch can realize quick and accurate engagement and separation, thereby flexibly switching the working state of the main spring assembly 2 and the auxiliary spring assembly 3 to adapt to different use requirements.

[0043] In some embodiments, as shown in Figure 1 and Figure 2 The switching assembly 4 includes a pawl 41 and a driving mechanism 42 connected thereto, and the secondary spring assembly 3 further includes a ratchet wheel 33 connected with the secondary spring 31, and the driving mechanism 42 drives the pawl 41 to abut or disengage with the ratchet wheel 33.

[0044] In addition, the pawl 41 includes a connecting portion 411 and an engaging portion 412, one end of the connecting portion 411 is connected with the output shaft of the driving mechanism 42, and the other end is connected with the engaging portion 412, and the driving mechanism 42 drives the engaging portion 412 to approach or move away from the ratchet wheel 33 through the connecting portion 411, so as to drive the engaging portion 412 to abut or disengage with the ratchet wheel 33.

[0045] Specifically, the driving mechanism 42 is located on one side of the primary spring assembly 2 and the secondary spring assembly 3, and is connected with the vehicle body structure. The driving mechanism 42 can adopt various modes such as electricity, gas or liquid pressure, and in the present application, the driving mechanism 42 is preferably a hydraulic driving mechanism 42, such as a hydraulic cylinder. The hydraulic cylinder driving mechanism 42 has high torque output, which is convenient for the pawl 41 to lock the ratchet wheel 33. The output shaft can be made of high-strength steel material to drive the pawl 41 to move stably for a long time. The driving mechanism 42 drives the engaging portion 412 of the pawl 41 to approach or move away from the ratchet wheel 33 through the connecting portion 411, so as to accurately control the abutting state of the pawl 41 and the ratchet wheel 33. When it is needed to switch the transmission path, the driving mechanism 42 will receive the corresponding instruction and drive the pawl 41 to move through the output shaft. In the process of the engaging portion 412 approaching the ratchet wheel 33, the engaging portion 412 of the pawl 41 will gradually contact the ratchet teeth of the ratchet wheel 33 until it is completely locked. Conversely, when disengaging, the driving mechanism 42 will drive the pawl 41 to move in the opposite direction, so that the engaging portion 412 gradually moves away from the ratchet wheel 33 until it is completely separated.

[0046] In addition, the switching assembly 4 further comprises a reset spring 43, which can effectively improve the stability and durability of the switching assembly 4. When the reset spring 43 is installed on the output shaft of the driving mechanism 42, one end of the reset spring 43 is connected with the output shaft, and the other end is connected with the connecting part 411 of the pawl 41. At this time, the connecting part 411 is fixedly connected with the clamping part 412. In the process of driving the clamping part 412 to approach the teeth of the ratchet wheel 33 by the driving mechanism 42, the clamping part 412 gradually contacts the teeth. With the rotation of the ratchet wheel 33, the clamping part 412 compresses the reset spring 43 under force, thereby more deeply locking the ratchet wheel 33. In this process, the impact and vibration caused by the collision between the clamping part 412 and the teeth of the ratchet wheel 33 can be easily generated. The reset spring 43 not only can absorb impact energy and reduce vibration, but also can buffer the force between the clamping part 412 and the teeth, reduce wear and tear, and prolong the service life of the two. In another case, the connecting part 411 and the clamping part 412 are connected through a hinge shaft, and the reset spring 43 is installed on the hinge shaft, one end of which abuts against the clamping part 412, and the other end abuts against the connecting part 411. In the process of interaction between the clamping part 412 and the ratchet wheel 33, the reset spring 43 installed on the hinge shaft can also play a buffering role. At the same time, the reset spring 43 can also assist the clamping part 412 to reset more smoothly after completing the locking action, thereby ensuring the smoothness of the operation of the entire switching assembly 4 and further improving the reliability of the safety belt control device. The clamping part 412 and the teeth of the ratchet wheel 33 can be made of high-carbon steel or alloy steel to make the clamping part 412 and the teeth have good wear resistance and high strength to withstand frequent clamping and releasing operations. The clamping part 412 and the teeth can also be heat treated to improve their hardness and fatigue resistance. The contact surface of the clamping part 412 and the teeth of the ratchet wheel 33 can also be treated by surface treatment technologies such as carburizing quenching, nitriding or spraying wear-resistant coating to reduce the wear of the contact surface of the clamping part 412 and the teeth of the ratchet wheel 33, thereby improving the service life of the ratchet wheel 33 and the pawl 41.

[0047] In the embodiment, the driving mechanism 42 directly drives the pawl 41, the transmission path is simple and efficient, energy loss is reduced, the abutment or disabutment of the pawl 41 and the ratchet wheel 33 can be more accurately controlled, the switching assembly 4 responds quickly, and the operation efficiency of the entire mechanical system is improved. The connecting part 411 and the clamping part 412 of the pawl 41 work cooperatively to enhance the stability of the structure. The connecting part 411 stably connects the output shaft of the driving mechanism 42 and the clamping part 412 to ensure reliable power transmission. The clamping part 412 can accurately approach or move away from the ratchet wheel 33 under the driving of the driving mechanism 42 through the connecting part 411 to realize stable locking and unlocking of the ratchet wheel 33, and reduce shaking and deviation in the working process.

[0048] In some embodiments, the main coil spring 21 comprises a main coil spring body 211 and a first mounting shell 212, the main coil spring body 211 is located in the first mounting shell 212, the first transmission shaft 22 penetrates through and is rotationally connected with the first mounting shell 212, one end of the main coil spring body 211 is connected with the periphery of the first transmission shaft 22 as a tightening end, and the other end is connected with the first mounting shell 212; the auxiliary coil spring 31 comprises an auxiliary coil spring body 311 and a second mounting shell 312, the auxiliary coil spring body 311 is located in the second mounting shell 312, the second transmission shaft 32 penetrates through and is rotationally connected with the second mounting shell 312, one end of the auxiliary coil spring body 311 is connected with the periphery of the second transmission shaft 32 as a tightening end, and the other end is connected with the second mounting shell 312.

[0049] In addition, the safety belt control device further comprises a shell 5, the main coil spring assembly 2 and the auxiliary coil spring assembly 3 are located in the shell 5, the first mounting shell 212 and the second mounting shell 312 are fixedly connected with the shell 5, the shell 5 is provided with a limiting hole 51 on the side close to the auxiliary coil spring assembly 3, the second transmission shaft 32 penetrates through and is rotationally connected with the limiting hole 51.

[0050] Specifically, the first mounting shell 212 and the second mounting shell 312 are cylindrical to adapt to the shape of the coil spring, while saving space, so that the seat belt control device structure is compact. The ratchet wheel 33 is installed on one side of the second mounting shell 312, and the center of the ratchet wheel 33 is fixedly connected with the second transmission shaft 32, so that the ratchet wheel 33 controls the transmission of the force of the secondary coil spring body 311 through the second transmission shaft 32. The first mounting shell 212 and the second mounting shell 312 are made of high-strength engineering plastics, such as polyether ether ketone (PEEK), which has a tensile strength of more than 100 MPa and a Rockwell hardness of more than 100 HRM. It can protect the main coil spring 21 and the secondary coil spring 31 from external impact and corrosion, while the density is only about 1.3 g / cm3, which helps to reduce the weight of the seat belt control device. The first transmission shaft 22 and the second transmission shaft 32 can be made of high-strength steel structure. Because the steel structure has high surface hardness, it is not easy to wear and deform, so that the friction surface always maintains good flatness, further reduces the friction coefficient, and can more effectively reduce the friction loss. At the same time, the high-strength steel structure has excellent fatigue resistance and is not prone to fatigue cracks during long-term frequent rotation, greatly improving the durability of the transmission shaft and prolonging its service life, ensuring that the first transmission shaft 22 and the second transmission shaft 32 work stably throughout the service life of the seat belt control device. The housing 5 is used to install and protect the main coil spring assembly 2 and the secondary coil spring assembly 3. The housing 5 is connected with the bracket 11 on one side of the mandrel 1, and the housing 5 is provided with an opening for connecting the ratchet wheel 33 and the pawl 41. The housing 5 can be made of metal materials, such as 7075 aluminum alloy, which has a tensile strength of more than 500 MPa and a yield strength of about 430 MPa. It has excellent protection performance and can effectively resist high-strength impact and extrusion from all directions to ensure the normal operation of the internal secondary coil spring assembly 3 and the main coil spring assembly 2. The housing 5 is provided with a limiting hole 51 near the secondary coil spring 31, and the second transmission shaft 32 penetrates the limiting hole 51 and is rotatably connected through a sliding bearing. The bearing is made of wear-resistant high-molecular materials, which has low friction coefficient and good wear resistance. The limiting hole 51 not only can precisely limit the second transmission shaft 32 to rotate strictly according to the specified track, but also can effectively reduce the shaking of the second transmission shaft 32 during rotation, thereby improving the stability and reliability of the entire seat belt control device.

[0051] In the present embodiment, the first mounting shell 212 is used to install the main coil spring 21, the second mounting shell 312 is used to install the secondary coil spring 31 and the ratchet wheel 33, and the housing 5 is used to install the first mounting shell 212 and the second mounting shell 312 and to protect the main coil spring assembly 2 and the secondary coil spring assembly 3. The housing 5 is provided with a limiting hole 51, which not only can precisely limit the second transmission shaft 32, but also can effectively reduce the shaking of the second transmission shaft 32 during rotation, thereby improving the stability of the second transmission shaft 32.

[0052] In some embodiments, as shown in Figure 1 and Figure 2 The safety belt control device further comprises a safety belt length measuring assembly 6, which comprises a permanent magnet ring 61 and a sensor 62. The permanent magnet ring 61 is sleeved on the outer periphery of the mandrel 1, and the sensor 62 is opposite to the permanent magnet ring 61. The sensor 62 measures the extension length of the safety belt 01 according to the number of rotations of the permanent magnet ring 61 on the mandrel 1. The sensor 62 is also connected to the switching assembly 4, so that the switching assembly 4 switches the working condition of the locking secondary spring assembly 3 and the working condition of the unlocking secondary spring assembly 3 according to the extension length of the safety belt 01.

[0053] Specifically, the permanent magnet ring 61 is provided with a plurality of N-poles and S-poles arranged at intervals, and the sensor 62 is a Hall sensor. When the safety belt 01 is pulled out, the mandrel 1 rotates, driving the permanent magnet ring 61 sleeved on its outer periphery to rotate. Since the permanent magnet ring 61 is provided with a plurality of N-poles and S-poles arranged at intervals, the magnetic field changes constantly with the rotation of the permanent magnet ring 61. The Hall sensor is opposite to the permanent magnet ring 61 and can sense these changes in the magnetic field. Every time an N-pole and an S-pole alternate, the Hall sensor will generate an electrical signal change. By counting these electrical signal changes, the number of rotations of the permanent magnet ring 61 can be accurately calculated. Because there is a fixed proportional relationship between the winding of the mandrel 1 and the safety belt 01, the extension length of the safety belt 01 can be accurately measured according to the number of rotations of the permanent magnet ring 61. According to the extension length of the safety belt 01, the switching assembly 4 switches the working condition of the locking secondary spring assembly 3 and the working condition of the unlocking secondary spring assembly 3. When the safety belt 01 is too long, in order to protect the passenger, the switching assembly 4 switches the working condition of the unlocking secondary spring assembly 3, so that the main spring assembly 2 and the secondary spring assembly 3 together provide a larger winding force to the mandrel 1, so that the safety belt 01 is tighter, avoiding injury to the passenger.

[0054] In this embodiment, through the cooperation of the Hall sensor and the permanent magnet ring 61, high-precision measurement of the extension length of the safety belt 01 can be achieved, providing more accurate data basis for subsequent control operations. The sensor 62 is connected to the switching assembly 4, which switches the working condition of the locking secondary spring assembly 3 and the working condition of the unlocking secondary spring assembly 3 according to the extension length of the safety belt 01. For example, when it is detected that the safety belt 01 is greatly extended, it is judged that an emergency situation may occur, and the locking secondary spring assembly 3 is quickly switched to the working condition, so that the safety belt 01 is quickly locked, preventing the passenger from being injured due to inertia forward thrust; when it is detected that the safety belt 01 is slightly extended, the unlocking secondary spring assembly 3 is kept in the working condition, ensuring the comfort of the passenger.

[0055] Based on the same inventive concept, the disclosure further provides a seat belt assembly comprising the seat belt control device of any one of the above and a seat belt 01 connected to the seat belt control device and having the beneficial effects of the corresponding embodiments of the seat belt control device, which are not repeated here.

[0056] Based on the same inventive concept, the disclosure further provides a vehicle comprising the seat belt assembly of the above and having the beneficial effects of the corresponding embodiments of the seat belt assembly, which are not repeated here.

[0057] The use scenarios of the seat belt control device in the present application are as follows:

[0058] Precondition: The vehicle is connected to KL15 electricity or KL30 electricity, the in-vehicle camera, the seat belt unfastening reminding system, the installation belt control device and the functions of each controller are all working normally. The following is the specific working condition of the seat belt control device in different scenarios:

[0059] Scenario 1: The passenger fastens the seat belt 01 after getting on the vehicle. In the first 30 seconds, the priority is to ensure that the seat belt 01 is retracted to fit the human body and protect the passenger. At this time, the secondary spring assembly 3 is in the unlocked state, and the primary spring assembly 2 and the secondary spring assembly 3 jointly provide the winding force for the mandrel 1. After the 30-second delay ends, the driving mechanism 42 is powered on, the pawl 41 abuts against the ratchet wheel 33, the first transmission shaft 22 is disconnected from the second transmission shaft 32, the secondary spring 31 is in the locked state, and only the primary spring assembly 2 provides the winding force for the mandrel 1, the winding force of the seat belt 01 is reduced, and the comfort of the passenger is improved.

[0060] Scenario 2: The vehicle speed reaches 10 km / h during starting. When the vehicle speed reaches 10 km / h during starting, the driving mechanism 42 receives the vehicle speed signal, the driving mechanism 42 is switched from power-on to power-off state, the pawl 41 is separated from the ratchet wheel 33, the first transmission shaft 22 is connected to the second transmission shaft 32, the primary spring assembly 2 and the secondary spring assembly 3 jointly provide the winding force for the mandrel 1, and the retraction force of the seat belt 01 is increased to ensure that the seat belt 01 closely fits the passenger during starting, and the safety of the passenger is ensured. After 30 seconds, the driving mechanism 42 is powered on again, and the secondary spring assembly 3 is locked to reduce the retraction force.

[0061] Scene 3: The vehicle speed is greater than or equal to 10 km / h and the passenger is abnormally off-site: During the driving process, when the vehicle speed is greater than or equal to 10 km / h, the image detection system is started, the in-vehicle camera monitors the passenger's sitting posture in real time, and whether the passenger is abnormally off-site, such as reaching for objects, is detected through image technology algorithm. By setting the normal sitting posture feature line, when the passenger's sitting posture is detected to be abnormal, the passenger's abnormal off-site signal will be sent. At the same time, if the seat belt length measuring assembly 6 detects that the seat belt 01 is pulled out to a length greater than the preset length, the driving mechanism 42 is switched from power-on to power-off, and the auxiliary coil spring 31 and the main coil spring 21 jointly act, and the recovery force of the seat belt 01 is increased. When the image detects that the passenger is abnormally off-site, the recovery of the passenger, the length of the belt is restored to normal, and the electromagnetic valve is powered on after 30 seconds, the auxiliary coil spring 31 is disconnected, and the recovery force is reduced.

[0062] Scene 4: The passenger unfastens the seat belt 01: When the passenger unfastens the seat belt 01, the seat belt 01 receives the unfastening signal, the driving mechanism 42 is switched from power-on to power-off, the auxiliary coil spring 31 and the main coil spring 21 jointly act, and the recovery force of the seat belt 01 is increased, thereby ensuring that the belt is smoothly recovered.

[0063] Those skilled in the art will understand that the above discussion of any of the embodiments is merely exemplary and is not intended to be limiting of the scope of the present application; the above embodiments or technical features among different embodiments can also be combined, and the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity. The same applies to the following description.

[0064] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present application difficult to understand, the known power / ground connections of integrated circuit chips and other components can or can not be shown in the provided drawings. In addition, the devices can be shown in the form of block diagrams in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present application are to be implemented (i.e. these details should be entirely within the understanding of those skilled in the art). Where specific details (e.g. circuits) are set forth in order to describe an exemplary embodiment of the present application, it will be apparent to those skilled in the art that the embodiments of the present application can be practiced without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0065] Although the present application has been described in conjunction with the specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures can use the embodiments discussed.

[0066] Embodiments of the present application are intended to cover any and all such substitutions, modifications, and variations. Accordingly, any one of the above-described embodiments of the present application can be replaced by any other disclosed embodiments of the present application, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can be substituted for any other disclosed series, and the entirety of any disclosed series can

Claims

1. A seat belt control device characterized by comprising: The application relates to a safety belt winding device, which comprises the following components: a mandrel (1) connected with one end of a safety belt (01) and providing winding force for the safety belt (01); a main winding spring assembly (2) located on one side of the mandrel (1) and connected with the mandrel (1); a secondary winding spring assembly (3) located on the side, away from the mandrel (1), of the main winding spring assembly (2); and a switching assembly (4) comprising a locking secondary winding spring assembly (3) working condition and an unlocking secondary winding spring assembly (3) working condition, wherein, in the locking secondary winding spring assembly (3) working condition, the switching assembly (4) is in abutment with the secondary winding spring assembly (3), the main winding spring assembly (2) is disconnected with the secondary winding spring assembly (3), and the main winding spring assembly (2) provides winding force for the mandrel (1) to the safety belt (01); and in the unlocking secondary winding spring assembly (3) working condition, the switching assembly (4) is out of abutment with the secondary winding spring assembly (3), the main winding spring assembly (2) is connected with the secondary winding spring assembly (3), and the main winding spring assembly (2) and the secondary winding spring assembly (3) jointly provide winding force for the mandrel (1) to the safety belt (01). The main winding spring assembly (2) comprises a main winding spring (21) and a first transmission shaft (22), the tightening end of the main winding spring (21) is connected to the periphery of the first transmission shaft (22), the secondary winding spring assembly (3) comprises a secondary winding spring (31) and a second transmission shaft (32), the tightening end of the secondary winding spring (31) is connected to the periphery of the second transmission shaft (32), and the first transmission shaft (22) is oppositely arranged with the second transmission shaft (32). In the locking secondary winding spring assembly (3) working condition of the switching assembly (4), the first transmission shaft (22) is disconnected with the second transmission shaft (32), the main winding spring assembly (2) provides winding force for the mandrel (1) to the safety belt (01) through the first transmission shaft (22); and in the unlocking secondary winding spring assembly (3) working condition of the switching assembly (4), the first transmission shaft (22) is connected with the second transmission shaft (32), the main winding spring assembly (2) and the secondary winding spring assembly (3) jointly provide winding force for the mandrel (1) to the safety belt (01) through the first transmission shaft (22) and the second transmission shaft (32). An electromagnetic clutch is arranged between the first transmission shaft (22) and the second transmission shaft (32), the driving part of the electromagnetic clutch is arranged at one end of the first transmission shaft (22), and the driven part of the electromagnetic clutch is arranged at one end of the second transmission shaft (32). The switching assembly (4) comprises a ratchet pawl (41) and a driving mechanism (42) connected with each other, the secondary winding spring assembly (3) further comprises a ratchet wheel (33) connected with the secondary winding spring (31), and the driving mechanism (42) drives the ratchet pawl (41) to abut against or be out of abutment with the ratchet wheel (33).

2. A safety belt control device according to claim 1, characterized in that ​ ​ 3. A safety belt control device according to claim 2, characterized in that ​ 4. A seat belt control device according to claim 2, wherein ​ 5. A safety belt control device according to claim 4, characterized in that The pawl (41) comprises a connecting part (411) and an engaging part (412), one end of the connecting part (411) is connected with the output shaft of the driving mechanism (42), the other end is connected with the engaging part (412), the driving mechanism (42) drives the engaging part (412) to move close to or away from the ratchet wheel (33) through the connecting part (411), so as to drive the engaging part (412) to abut or disengage with the ratchet wheel (33).

6. The seat belt control device of claim 1, wherein Further comprising a safety belt length measuring assembly (6), the safety belt length measuring assembly (6) comprises a permanent magnet ring (61) and a sensor (62), the permanent magnet ring (61) is sleeved on the periphery of the mandrel (1), the sensor (62) is opposite to the position of the permanent magnet ring (61), so that the sensor (62) measures the extension length of the safety belt (01) according to the number of rotations of the permanent magnet ring (61) on the mandrel (1), and the sensor (62) is connected with the switching assembly (4), so that the switching assembly (4) switches the working conditions of the locking auxiliary coil spring assembly (3) and the unlocking auxiliary coil spring assembly (3) according to the extension length of the safety belt (01).

7. A seat belt control device according to claim 2, wherein The main coil spring (21) comprises a main coil spring body (211) and a first mounting shell (212), the main coil spring body (211) is located in the first mounting shell (212), the first transmission shaft (22) penetrates through the first mounting shell (212) and is rotationally connected with the first mounting shell (212), one end of the main coil spring body (211) is connected with the periphery of the first transmission shaft (22) as a tightening end, and the other end is connected with the first mounting shell (212); the auxiliary coil spring (31) comprises an auxiliary coil spring body (311) and a second mounting shell (312), the auxiliary coil spring body (311) is located in the second mounting shell (312), the second transmission shaft (32) penetrates through the second mounting shell (312) and is rotationally connected with the second mounting shell (312), one end of the auxiliary coil spring body (311) is connected with the periphery of the second transmission shaft (32) as a tightening end, and the other end is connected with the second mounting shell (312).

8. A seat belt control device according to claim 7, wherein Further comprising a housing (5), the main coil spring assembly (2) and the auxiliary coil spring assembly (3) are located in the housing (5), the first mounting shell (212) and the second mounting shell (312) are fixedly connected with the housing (5), the housing (5) is provided with a limiting hole (51) on the side close to the auxiliary coil spring assembly (3), and the second transmission shaft (32) penetrates through the limiting hole (51) and is rotationally connected with the limiting hole (51).

9. A seat belt assembly characterized by, The safety belt control device and the safety belt (01) according to any one of claims 1-8 are included.

10. A vehicle characterized by comprising: The safety belt assembly according to claim 9 is included.

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