CN114771456B - Safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers - Google Patents
Safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers Download PDFInfo
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- CN114771456B CN114771456B CN202210477149.3A CN202210477149A CN114771456B CN 114771456 B CN114771456 B CN 114771456B CN 202210477149 A CN202210477149 A CN 202210477149A CN 114771456 B CN114771456 B CN 114771456B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/12—Construction of belts or harnesses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Seats For Vehicles (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
A safety belt buffering, energy absorbing and energy consuming device for protecting the collision safety of passengers. The instantaneous high pressure of the safety belt to the human body during collision is buffered and absorbed by utilizing the continuous deformation of the compliant unit cells in the compliant metamaterial, and the compliant metamaterial is formed by connecting a plurality of compliant unit cells with similar basic structures in series. The compliant cell body is divided into a rigid rod and a flexible sheet according to the deformation function. The rigid rod comprises an upper safety belt supporting shaft and two lower safety belt supporting shafts, two stabilizing connecting rods, and the two lower safety belt supporting shafts and the two stabilizing connecting rods 4 form a quadrilateral structure after being assembled. The flexible sheet comprises four deformable sheets with the same structure, and the upper safety belt supporting shafts and the lower safety belt supporting shafts are fixedly connected in a group. The application can effectively and evenly buffer the impact force of the safety belt to the passengers when being applied to the collision safety protection of the automobile passengers; the metamaterial formed by the plurality of unit cells can cope with collision accidents in various different conditions; simple structure, stable performance and low cost.
Description
Technical Field
The application belongs to the technical field of automobile safety, and relates to a safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers.
Background
When an automobile collides, the kinetic energy dissipation of an occupant mainly comprises two parts: part is the energy dissipated by the occupant through deformation of the restraint system and deformation of the vehicle body trim, so-called occupant restraint energy; the other part is the energy that the occupant transmits to the vehicle body through the restraint system and expends during deformation of the front of the vehicle body, so-called crush energy (also called Ride-down energy). The above two ways of energy distribution have a significant impact on occupant injury in the event of a collision. It is generally considered that the improvement of Ride-down efficiency as much as possible can improve occupant response while ensuring other portions and other indexes. The safety belt is used as an important component of the restraint system, and on the premise of meeting the living space, the rigidity of the restraint system mainly comprising the safety belt is reduced as much as possible, so that the Ride-down efficiency is improved, the response of passengers is reduced, and the risk of serious injury to the passengers is reduced.
While providing better restraint protection when the harness system is relatively stiff, it is more likely to cause injury to the human body. Particularly in the case of a high-speed collision, the reaction force of the safety belt to the human body may cause serious injury including fracture and the like. In order to reduce the instantaneous impact force applied to a human body by a safety belt during a car body collision, better collision energy absorption characteristics and better comfort and convenience are always one main idea of design development of the safety belt. The existing devices capable of improving the collision energy absorption characteristics of the safety belt are mainly force-limiting safety belt and air bag type safety belt, and in addition, the energy absorption characteristics such as strength, elongation and the like are required for the safety belt webbing.
The existing safety belt collision energy absorbing device or mode has some defects and shortcomings, and mainly has the following problems:
(1) The protection effect is limited. Taking a force limiting seat belt as an example, it relies on torsion bars in the retractor to provide the degree of cushioning. When the tension of the safety belt reaches a set force limit value, the torsion bar triggers a rotation effect, and the webbing which is released from the torsion bar can be used as buffer. The use of the force limiter can improve the buffering characteristic of the safety belt, so that the safety belt can apply more uniform restraining force to passengers, and the uncomfortable feeling during use is reduced. But the problems are: 1) Such safety belts are greatly affected by a preset force limit value and can only play a protective role after the tension of the safety belt exceeds the value; 2) Such belts do not have the function of energy dissipation, and the absorbed energy is released to act on the occupant again; 3) The force limiting value is too small or too large, and the protection effect is poor.
(2) The structure is complex, the control mode is complex, and the cost is relatively high. The protection effect of the air bag type safety belt is better than that of the common safety belt and the force limiting type safety belt, but the structural complexity and the cost are greatly increased, and the safety belt generally comprises a plurality of elements such as a gas generator, a sensor and the like and is more complicated in control. The technology is limited by cost, is more than a middle-high-end vehicle type, has insufficient popularization degree, and is difficult for common users to install by themselves.
(3) The requirements for the seat belt webbing itself are mainly energy absorption indicators such as strength, elongation, etc., which have been basically standardized and which are different before there is no new development in the energy absorbing webbing material. Notably, for a seat belt webbing of a certain type, its rigidity cannot be dynamically adjusted according to the collision situation, resulting in an unstable cushioning effect. In addition, most of the energy absorbed by the seat belt webbing is not dissipated, but is released again to the occupant, which is prone to multiple injuries.
In summary, an ideal seat belt restraint system should have the following two functional features: 1) The buffer function can be used for uniformly ensuring the pressure of the safety belt on the body of the passenger, reducing the response of the passenger, and mainly reducing the instantaneous acceleration of the passenger; 2) The energy absorption and energy dissipation function can absorb part of the kinetic energy of the passenger caused by collision and fully or partially dissipate the kinetic energy, so that the kinetic energy cannot be reapplied to the passenger.
It is possible to improve the energy absorption characteristics of the seat belt from a structural point of view. Metamaterials possess special properties that are not possessed by natural materials, but which come from artificial special structures. The soft multistable mechanism has unique advantages in the aspect of buffering and energy absorption, and comprises the advantages of simple structure, convenience in manufacturing, remarkable energy absorption effect and the like, and the metamaterial combining the characteristics of the soft mechanism has the advantages of quick response, good energy absorption effect and the like, so that a new thought can be provided for the design of the buffering and energy absorption structure of the safety belt.
Disclosure of Invention
The application provides a safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers. The device utilizes the continuous deformation of the compliant unit cell bodies in the compliant metamaterial to buffer and absorb the instantaneous high pressure of the safety belt to the human body during collision, so that the pressure of the safety belt to the chest and abdomen of the human body is relieved while the effective restraint of the safety belt to the human body is ensured, and the effect of buffering is achieved. The application can absorb the energy generated by collision and dissipate all or part of the energy, namely, the energy absorption and energy consumption functions are achieved.
The rigidity characteristic and the energy absorption threshold of the compliant unit cell can be adjusted by changing the parameters such as the material, the structure and the like of the compliant unit cell. The energy absorption threshold value refers to that when the absorbed energy reaches a certain value, the energy is dissipated, and the structure loses the ability of continuing to absorb energy. Furthermore, the compliant single bodies with different parameters are serially assembled in a certain sequence, so that the metamaterial can be formed, and the whole structure of the metamaterial covers a plurality of rigidity characteristics and energy absorption thresholds, so that the metamaterial can cope with collision of a plurality of different degrees. The application can be additionally arranged on the common automobile safety belt according to the requirements, has the characteristics of modularization, simple structure, convenient disassembly and assembly, high reliability, stable performance and low cost.
In order to realize the application, the technical scheme adopted by the application is as follows:
a safety belt buffering, energy absorbing and energy consuming device for providing protection in a passenger collision scene utilizes continuous deformation of a compliant unit cell in a compliant metamaterial to buffer and absorb instantaneous high pressure of a safety belt to a human body during collision. The compliant metamaterial is formed by serially connecting a plurality of compliant single bodies with similar basic structures according to a certain sequence.
The compliant cell body can be divided into two parts of a rigid rod and a flexible sheet 3 according to the deformation function. The rigid rod comprises an upper safety belt supporting shaft 1 and two lower safety belt supporting shafts 2 which are identical in structure, are parallel to each other and are arranged in a 'delta' shape, namely, the upper safety belt supporting shaft 1 is positioned at the middle upper part of the plane where the two lower safety belt supporting shafts 2 are positioned. The rigid rod also comprises two stable connecting rods 4 with the same structure, through holes for connecting the end parts of the lower safety belt supporting shafts 2 are formed in two ends of each stable connecting rod 4, and the two lower safety belt supporting shafts 2 and the two stable connecting rods 4 form a parallelogram structure after being assembled. The flexible sheets 3 comprise four deformable sheets with the same structure, wherein the deformable sheets are respectively fixed at two ends of the upper safety belt supporting shaft 1 in pairs, the other ends of the four flexible sheets 3 are fixed on the lower safety belt supporting shaft 2, namely, the four flexible sheets 3 are respectively fixedly connected with the upper safety belt supporting shaft 1 and the two lower safety belt supporting shafts 2 in pairs, and thus, the two flexible sheets 3 in the same plane, the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2 form a quadrangle. In addition, from the end view of the rigid rod, a triangular shape is formed between the upper belt support shaft 1, the lower belt support shaft 2, the flexible sheet 3 and the stabilizing connecting rod 4.
Further, the flexible sheet 3 may be linear, broken-line-type or curved, i.e. the flexible sheet 3 may be an angled curved sheet as a thin sheet, which may be notionally straight, broken-line-type or curved from the side.
Further, the number of flexible sheets 3 in each compliant cell may be an even number greater than four, still symmetrically arranged on both sides of the upper belt support shaft 1 according to the logic described above. On the basis of the four flexible sheets, one flexible sheet can be respectively and parallelly added along the normal direction of the original flexible sheet to form an eight-flexible-sheet structure.
Further, the width and length of the flexible sheet 3 are much greater than the thickness thereof, and the difference can be generally up to more than 10 times.
Further, the connection relationship among the upper safety belt supporting shaft 1, the lower safety belt supporting shaft 2 and the flexible sheet 3 of the compliant cell body can be realized through integrated manufacture, and also can be realized through assembly after separate manufacture. The stable connecting rod 4 is manufactured separately and then assembled with the upper and lower belt supporting shafts 1, 2 and the flexible sheet 3 which are manufactured integrally or assembled.
Further, it is contemplated that the deformation process may be accomplished by ensuring that the components are similarly stressed with respect to each other, regardless of the change in shape of the components.
Further, the included angle θ between the flexible sheet 3 and the stabilizing connecting rod 4 and the geometric parameters (length, width and thickness) of the flexible sheet 3 can be used as the adjusting parameters for controlling the cushioning, energy absorption and energy consumption effects of the compliant cell body, namely the adjusting parameters of the stiffness characteristic and the energy absorption threshold. The adjustment of these parameters is done before manufacturing, but not after manufacturing. In addition, the material of the flexible sheet is also one of the parameters that adjust its stiffness characteristics and energy absorption threshold.
Further, each compliant cell has certain deformation energy absorption characteristics (namely stiffness characteristics and energy absorption threshold values) after the regulation parameters are set, and the deformation energy absorption characteristics are single and invariable and can be independently applied. In order to enhance the effects of buffering, energy absorption and energy consumption, the application has the rigidity characteristic and the energy absorption threshold value with wider margin, and the compliant unit cells with different rigidity characteristics and energy absorption threshold values can be connected in series to form a metamaterial containing a plurality of compliant unit cells, so that the application can cope with collision conditions with different degrees. One of the characteristics of the metamaterial is that the deformation energy absorption characteristic of the metamaterial is not only influenced by the performance of each compliant unit cell, but also can be changed due to different arrangement and arrangement of each compliant unit cell. The reasonable arrangement of the stiffness characteristic and the energy absorption threshold of the metamaterial can be realized by respectively setting the parameters of each compliant unit cell and arranging the parameters in series according to a certain sequence. The implementation mode of the series connection is as follows: a lower safety belt supporting shaft 2 is shared between two adjacent compliant unit bodies, and the stabilizing connecting rods 4 of the two compliant unit bodies are connected with the shared lower safety belt supporting shaft 2. Or other connection schemes or integrated fabrication may be employed to achieve this effect.
When the flexible cell body is installed and used, the safety belt is required to be contacted with the surfaces of the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2 at the same time, namely, the safety belt passes through the surfaces of the rigid rods in sequence according to the contact sequence of the lower safety belt supporting shaft 2, the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2, and in the process, the safety belt continuously passes through quadrilateral areas formed by two flexible sheets and the upper safety belt supporting shaft and the lower safety belt supporting shaft respectively. When the belt is pulled under force, the upper belt support shaft 1 is pressed by the belt and then moves along the plane of the two lower belt support shafts 2, and the four flexible sheets 3 deform accordingly. The forces to which the safety belt is subjected can be damped, absorbed and dissipated by deformation of the flexible sheet 3. In the case of the connection of the devices described in the present application, the flexible sheet will rotate, when deformed, the lower belt support shaft 2 connected thereto about the through hole of the latter in contact with the stabilizing bar 4.
When in use, the application is used as an accessory device of the safety belt, and the safety belt can be correctly installed to play a role. Specifically: when there is only one compliant cell, the belt continuously passes through the inside of the two quadrangles formed by the upper and lower belt support shafts 1, 2 and the flexible sheet in the order of contact of the lower belt support shaft 2, the upper belt support shaft 1, and the lower belt support shaft 2, and the belt remains in contact with the surfaces of these rigid rods after installation. When a plurality of compliant cell bodies form a metamaterial, the installation of the safety belt is similar to the process, except that the safety belt continuously passes through the quadrilateral formed by all upper and lower safety belt supporting shafts and the flexible sheet according to the contact sequence of the lower safety belt supporting shaft 2, the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2, and the contact between the safety belt and the surfaces of all rigid rods can be kept after the installation is completed. In general, the application has the advantage that when the safety belt is tensioned by being stressed, the compliant unit cell can maintain good support for the safety belt so as to transmit the stress. When the car collides, the human body rushes forward to cause the instantaneous high tension of the safety belt body, the safety belt is tightened to stress the upper safety belt supporting shaft, and the flexible sheet 3 is driven to deform. The deformation process of the flexible sheet 3 is the process of buffering and absorbing energy. Because the deformation process is irreversible, the absorbed energy is dissipated, thereby avoiding secondary injury to the occupant.
The beneficial effects of the application are as follows:
(1) The application applies the soft unit cell body in the collision safety protection of the automobile passengers, can effectively and evenly bring the impact force of the safety belt to the passengers, and absorbs the kinetic energy of the passengers. And the absorbed energy will be dissipated so that it cannot act on the occupant again.
(2) The single compliant unit cell can cope with limited collision accidents, and after the plurality of compliant unit cell bodies form the metamaterial, the rigidity characteristic and the energy absorption threshold value of a wider margin value can be realized, so that the single compliant unit cell can cope with the collision accidents of various different conditions, and passengers can be better protected.
(3) In addition, the application can be additionally arranged on the common automobile safety belt according to the requirements, has the characteristics of modularization, and has the advantages of simple structure, convenient disassembly and assembly, high reliability, stable performance and low cost.
Drawings
FIG. 1 is a schematic diagram of a compliant unit cell structure in an automotive seat belt buffering, energy absorbing and energy dissipating device according to the present application.
FIG. 2 is a schematic diagram showing the fit of a unit cell of the buffering, energy absorbing and energy dissipating device for an automobile safety belt and the safety belt.
FIG. 3 is a schematic diagram of the deformation of the core unit cell of the buffering, energy absorbing and energy dissipating device of the automobile safety belt according to the present application.
FIG. 4 is a schematic illustration of an embodiment of a compliant cell body employing eight folded flexible sheets in a bumper, energy absorber and energy consumer device for an automotive safety belt according to the present application.
Fig. 5 is a schematic diagram of the structure and composition of the metamaterial in the automobile safety belt buffering, energy absorbing and energy dissipating device.
FIG. 6 is a schematic illustration of a compliant metamaterial embodiment formed of a three compliant unit cell in an automotive seat belt cushioning, energy absorbing, and energy dissipating device in accordance with the present application.
Fig. 7 is a schematic diagram showing a specific installation of the buffering, energy absorbing and energy dissipating device of the automobile safety belt according to the present application.
In the figure, an upper safety belt supporting shaft, a lower safety belt supporting shaft, a flexible sheet, a stable connecting rod, a safety belt D ring, a safety belt buckle, a safety belt anchor point and a buffering and energy absorbing device are respectively arranged on the upper safety belt supporting shaft, the lower safety belt supporting shaft, the flexible sheet, the stable connecting rod, the safety belt D ring, the safety belt buckle, the safety belt anchor point and the buffering and energy absorbing device.
Detailed Description
The following describes specific embodiments of the present application in detail with reference to the technical scheme and the accompanying drawings.
A safety belt buffering, energy absorbing and energy consuming device for providing protection in a collision scene of an occupant, wherein the safety belt buffering, energy absorbing and energy consuming device utilizes continuous deformation of a compliant metamaterial to buffer and absorb instantaneous high pressure of a safety belt to a human body during collision. The compliant metamaterial is formed by serially connecting a plurality of compliant single bodies with similar basic structures according to a certain sequence. The compliant cell body can be divided into two parts of a rigid rod and a flexible sheet 3 according to the deformation function. The rigid rod comprises an upper safety belt supporting shaft 1 and two lower safety belt supporting shafts 2 which are identical in structure, are parallel to each other and are arranged in a 'delta' shape, namely, the upper safety belt supporting shaft 1 is positioned at the middle upper part of the two lower safety belt supporting shafts 2. The rigid rod also comprises two stable connecting rods 4 with the same structure, through holes for connecting the end parts of the lower safety belt supporting shafts 2 are formed in two ends of each stable connecting rod 4, and the two lower safety belt supporting shafts 2 and the two stable connecting rods 4 form a parallelogram structure. The stabilizing connecting rods 4 are respectively located at two ends of the lower seat belt supporting shaft 2 and connect the lower seat belt supporting shafts 2, i.e. two stabilizing connecting rods 4 and two lower seat belt supporting shafts also form a parallelogram. The flexible sheets 3 comprise four deformable sheets with the same structure, wherein the deformable sheets are respectively fixed at two ends of the upper safety belt supporting shaft 1 in pairs, the other ends of the four flexible sheets 3 are fixed on the lower safety belt supporting shaft 2, namely, the upper safety belt supporting shaft 1 is respectively fixedly connected with the two lower safety belt supporting shafts 2 in pairs in the four flexible sheets 3, and thus, the two flexible sheets 3 in the same plane, the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2 form a quadrangle. In addition, from the end view of the rigid rod, a triangular shape is formed among the upper belt support shaft 1, the lower belt support shaft 2, the flexible sheet 3 and the stabilizer link 4.
FIG. 1 is a schematic diagram of a compliant unit cell structure of an automotive seat belt buffering, energy absorbing and energy dissipating device according to the present application. The performance of the compliant unit cell, namely the effects of buffering, energy absorption and energy consumption, is ensured by two parameters of materials and structures. For convenience of description, the compliant structures mentioned by default in the present application are all made of the same material. However, it should be noted that it is also contemplated to reasonably arrange materials of different compliant structures in combination with the regulation of other structural parameters to achieve the adjustment of the overall performance. In the aspect of the structure of the compliant unit cell, the deformation threshold force of the compliant unit cell can be adjusted by changing the included angle parameter theta between the flexible sheet 3 and the stable connecting rod 4, so that the expected deformation performance is obtained.
FIG. 2 is a schematic diagram showing the cooperative installation of a compliant unit cell and a safety belt of an automobile safety belt buffering, energy absorbing and energy dissipating device according to the present application. When the compliant cell body is installed and used, the safety belt is contacted with the surfaces of the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2 at the same time, namely, the safety belt passes through the surfaces of the rigid rods sequentially according to the contact sequence of the lower safety belt supporting shaft 2, the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2. When the belt is pulled under force, the upper belt support shaft 1 is subjected to belt pressure, which produces a tendency to move with the belt, and the four flexible sheets 3 deform accordingly. The forces to which the safety belt is subjected can be damped, absorbed and dissipated by deformation of the flexible sheet 3. In this process, the upper belt support shaft 1 moves toward the lower belt support shaft 2, and the flexible sheet deforms to rotate the lower belt support shaft 2 connected thereto about the through hole in contact with the stabilizer link 4.
FIG. 3 is a schematic diagram of the metamaterial morphology and structure of the buffering, energy absorbing and energy dissipating device of the automobile safety belt according to the present application, which represents a specific embodiment. Specifically, the metamaterial is formed by sequentially connecting a plurality of compliant unit cells with different parameters in series according to the illustrated sequence, and two adjacent compliant unit cells share a lower safety belt supporting shaft 2. The upper and lower belt support shafts 1, 2 and the flexible sheet 3 of each compliant unit cell are all integrally manufactured, while the stabilizing connecting rod 4 is manufactured separately and is involved in assembly through the end through holes thereof. After the manufacture of the compliant unit cell is finished, the parameters are determined to be unable to be modified, but the metamaterial can adjust the overall buffering, energy absorbing and energy consuming effects by reasonably arranging the number of the compliant unit cells with different parameters and the connection sequence among the compliant unit cells. The connection sequence is the sequence of who is adjacent to the compliant unit bodies with different parameters or sharing the lower safety belt supporting shaft.
FIG. 4 is a schematic illustration of an embodiment of a compliant cell body added flexible sheet in an automotive seat belt cushioning, energy absorbing and dissipating device according to the present application, with all flexible sheets being folded sheets. In this embodiment, the upper and lower belt support shafts 1, 2 are still symmetrically arranged with four pairs of eight flexible sheets 3 at the two ends of the logic, which can be understood as the four flexible sheet structures that are obtained by adding four flexible sheets 3 in parallel along the normal direction of the flexible sheets 3 and then making corresponding changes to other connection structures. Thus, two flexible sheets 3 connected with the end part of a certain lower safety belt supporting shaft 2 are parallel, and four flexible sheets are connected with the upper safety belt supporting shaft 1 and the lower safety belt supporting shaft 2 in parallel in an eight shape from the perspective of the certain end part of the safety belt supporting shaft.
FIG. 5 is a schematic diagram of the basic compliant cell body operating deformation in the present application for an automotive seat belt cushioning, energy absorbing and dissipating device. The device relies mainly on the deformation of the flexible sheet 3 to buffer, absorb and dissipate energy. When the belt is pulled under force, the upper belt support shaft 1 is pressed by the belt and then moves along the plane of the two lower belt support shafts, and the four flexible sheets 3 deform accordingly. The forces to which the safety belt is subjected can be damped, absorbed and dissipated by deformation of the flexible sheet 3. As a specific embodiment, the flexible sheet 3 will, when deformed, rotate the lower belt support shaft 2 connected thereto about the through hole of the latter in contact with the stabilizing bar 4.
The above represents the basic compliant cell deformation energy absorption process. In the metamaterial composed of a plurality of compliant unit cells, each compliant unit cell shows different stiffness characteristics and energy absorption thresholds due to different parameters. The threshold is low, so that the energy absorber is easy to deform and can be used as buffering, otherwise, the energy absorber is not easy to deform and can absorb more energy relatively. Thus, the whole system can realize good coping with different collision situations.
Specifically, FIG. 6 represents an embodiment in which three compliant cells are connected in series by a common lower belt support shaft to form a compliant metamaterial. The detailed settings are as follows; 1) Setting all unit cell materials to be 6061 aluminum materials; 2) Setting all lower seat belt supportsThe shaft is a cylindrical rigid rod with the diameter of 20mm and the length of 110mm, and the shafts are spaced 100mm apart from each other; 3) Setting the upper safety belt supporting shaft as a cylindrical rigid rod with the diameter of 20mm and the length of 90 mm; 4) The flexible sheets are set to be thin sheets with the thickness of 1.5mm and the width of 20 mm; 5) Setting the connection between the flexible sheet and the upper and lower safety belt supporting shafts to be completed through integrated manufacturing; 6) The stable connecting rod is set to be a rigid rod with the length of 120mm, the width of 20mm and the thickness of 5mm, and two ends of the stable connecting rod are provided with through holes with the inner diameter of 20mm and are used for being connected with the end parts of two lower safety belt supporting shafts; 7) Setting an included angle theta between the stable connecting rod and the flexible sheet in the compliant unit cell bodies 1, 2 and 3 1 、θ 2 、θ 3 30 °, 50 °, 40 °, respectively. Figure 7 illustrates one particular mating installation of the compliant metamaterial with a seat belt.
The examples described above represent only embodiments of the application and are not to be understood as limiting the scope of the patent of the application, it being pointed out that several variants and modifications may be made by those skilled in the art without departing from the concept of the application, which fall within the scope of protection of the application.
Claims (7)
1. The safety belt buffering, energy absorbing and energy consuming device for protecting the collision safety of passengers is characterized in that the safety belt buffering, energy absorbing and energy consuming device utilizes continuous deformation of a compliant unit cell body in a compliant metamaterial to buffer and absorb instantaneous high pressure of the safety belt to a human body during collision; the compliant metamaterial is formed by serially connecting a plurality of compliant single bodies with similar basic structures according to a certain sequence;
the compliant unit cell body can be divided into a rigid rod and a flexible sheet (3) according to the deformation function; the rigid rod comprises an upper safety belt supporting shaft (1) and two lower safety belt supporting shafts (2) which are identical in structure, are parallel to each other and are arranged in a 'delta' shape; the rigid rod further comprises two stable connecting rods (4) with the same structure, through holes for connecting the ends of the lower safety belt supporting shafts (2) are formed in two ends of each stable connecting rod (4), and the two lower safety belt supporting shafts (2) and the two stable connecting rods (4) form a parallelogram structure after being assembled; the flexible sheets (3) comprise four deformable sheets with the same structure, the upper safety belt supporting shafts (1) are fixedly connected with the lower safety belt supporting shafts (2) in pairs, and the two flexible sheets (3) in the same plane, the upper safety belt supporting shafts (1) and the lower safety belt supporting shafts (2) form a quadrangle; from the end view of the rigid rod, the upper safety belt supporting shaft (1), the lower safety belt supporting shaft (2), the flexible sheet (3) and the stabilizing connecting rod (4) form a triangle;
when the flexible unit cell is installed and used, the safety belt is required to be contacted with the front surfaces of the upper safety belt supporting shaft (1) and the lower safety belt supporting shaft (2) at the same time, and continuously passes through quadrilateral areas formed by the two flexible sheets and the upper safety belt supporting shaft and the lower safety belt supporting shaft respectively; when the safety belt is stressed and pulled tightly, the upper safety belt supporting shaft (1) moves towards the plane where the two lower safety belt supporting shafts (2) are positioned along with the safety belt after being stressed by the safety belt, and the four flexible sheets (3) deform along with the safety belt; the force applied by the safety belt is buffered, absorbed and consumed through the deformation of the flexible sheet (3); the flexible sheet (3) drives the lower safety belt supporting shaft (2) connected with the flexible sheet to rotate by taking the through hole of the lower safety belt supporting shaft, which is contacted with the stabilizing connecting rod (4), as the center.
2. A seat belt cushioning, energy absorbing and dissipating device for occupant crash safety protection as defined in claim 1, wherein compliant cells having different stiffness characteristics and energy absorbing thresholds are connected in series to form a metamaterial comprising a plurality of compliant cells, which is responsive to different degrees of crash conditions.
3. The seat belt buffering, energy absorbing and energy dissipating device for occupant crash safety protection of claim 1, wherein the serial connection is implemented by: a lower safety belt supporting shaft (2) is shared between two adjacent compliant unit bodies, and the stabilizing connecting rods (4) of the two compliant unit bodies are connected with the shared lower safety belt supporting shaft (2); or by integrated manufacturing.
4. A seat belt cushioning, energy absorbing and dissipating device for occupant crash safety protection according to claim 1, characterized in that the width and length of the flexible sheet (3) is greater than its thickness.
5. The seat belt buffering, energy absorbing and energy dissipating device for occupant crash safety protection according to claim 1, characterized in that the upper seat belt support shaft (1), the lower seat belt support shaft (2) and the flexible sheet (3) in the compliant unit cell can be realized by integral manufacturing or by assembling after separate manufacturing.
6. A seat belt cushioning, energy absorbing and dissipating device for occupant crash safety protection according to claim 1, characterized in that the angle between the flexible sheet (3) and the stabilizing connecting rod (4)θ、The material of the flexible sheet and the geometric parameters of the flexible sheet (3) are used as the regulating parameters for controlling the buffering, energy absorption and energy consumption effects of the flexible unit cell, namely the regulating parameters of the rigidity characteristic and the energy absorption threshold.
7. The safety belt buffering, energy absorbing and energy dissipating device for protecting the collision safety of passengers according to claim 1, wherein the number of the flexible sheets (3) in each compliant unit cell is an even number greater than four, and the flexible sheets are symmetrically arranged at two sides of the upper safety belt supporting shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210477149.3A CN114771456B (en) | 2022-05-03 | 2022-05-03 | Safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210477149.3A CN114771456B (en) | 2022-05-03 | 2022-05-03 | Safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114771456A CN114771456A (en) | 2022-07-22 |
| CN114771456B true CN114771456B (en) | 2023-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210477149.3A Active CN114771456B (en) | 2022-05-03 | 2022-05-03 | Safety belt buffering, energy absorbing and energy consuming device for protecting collision safety of passengers |
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| Country | Link |
|---|---|
| CN (1) | CN114771456B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1384010A (en) * | 2001-04-29 | 2002-12-11 | 王武生 | Safety belt with energy-absorbing and controlling functions |
| CN201080169Y (en) * | 2007-08-23 | 2008-07-02 | 比亚迪股份有限公司 | Safety belt for motor vehicle passenger |
| CN204037508U (en) * | 2014-06-23 | 2014-12-24 | 沈阳金杯锦恒汽车安全系统有限公司 | A kind of car belt with energy snubber formula ribbon |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7686339B2 (en) * | 2006-08-30 | 2010-03-30 | Tk Holdings Inc. | Seat belt apparatus |
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2022
- 2022-05-03 CN CN202210477149.3A patent/CN114771456B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1384010A (en) * | 2001-04-29 | 2002-12-11 | 王武生 | Safety belt with energy-absorbing and controlling functions |
| CN201080169Y (en) * | 2007-08-23 | 2008-07-02 | 比亚迪股份有限公司 | Safety belt for motor vehicle passenger |
| CN204037508U (en) * | 2014-06-23 | 2014-12-24 | 沈阳金杯锦恒汽车安全系统有限公司 | A kind of car belt with energy snubber formula ribbon |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114771456A (en) | 2022-07-22 |
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