Seat backrest magneto-rheological damper

Abstract

The utility model discloses a magnetorheological damper for a seat backrest. The seat back magneto-rheological damper comprises at least one magneto-rheological damper mounted in operable connection with a seat back, and the magneto-rheological damper is configured to provide vibration damping or buffering for the seat back; the at least one sensor and the at least one magneto-rheological damper are installed in a matched mode, and the sensor is configured to be used for collecting or monitoring data related to vibration or shaking of the seat backrest; wherein the at least one magneto-rheological damper comprises at least one of a magneto-rheological rotary damper and a piston type magneto-rheological damper.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetorheological devices, systems and their applications, and particularly relates to a magnetorheological shock absorber for a seat back and its application in shock absorption or buffering of a seat back. Background Art

[0002] Magnetorheological technology and equipment are in a period of large-scale growth in technology and application globally and in China. In the fields of military and civilian vehicles, construction machinery, engineering vehicles, industrial processing and equipment shock absorption, etc., magnetorheological dampers using magnetorheological fluid as the working medium are increasingly being used to achieve technical effects such as shock absorption, damping, and buffering.

[0003] With the development of technology and the improvement of people's living standards, means of transportation such as cars have gradually become an indispensable part of people's daily lives. In means of transportation or working equipment such as military and civilian vehicles, engineering vehicles, operating equipment with seats, trucks, construction machinery, ships, airplanes, special vehicles, etc., the comfort of their seats is one of the important factors affecting the user experience of users including passengers and operators.

[0004] The shock absorption system of the seat is a key factor affecting seat comfort and long-term user friendliness. Traditionally, rubber spring shock-absorbing seats can be used. Such a seat shock absorption system usually uses mechanical elements / components such as springs and other types of dampers to absorb and consume vibration energy through mechanical deformation, thereby reducing the impact of vibration on passengers. However, there are some problems with this traditional shock absorption system. For example, the damping force cannot be adjusted in real time and cannot meet the needs of different passengers or operators; among the defects of existing seat back shock absorbers, it is also manifested that the damping force for shock absorption cannot be effectively and accurately controlled, and the shock absorption damping force range is relatively narrow; these problems and defects will lead to certain limitations in the shock absorption effect of the seat back and cannot meet the needs under different working conditions and different vibration frequencies.

[0005] In addition, in existing seat back vibration damping technical solutions, there is also an obvious limitation, that is, these solutions can only effectively damp vibrations within a specific range of vibration frequencies. This means that when the vibration frequency of the seat back changes significantly, the existing damping equipment and technologies designed for this specific working condition (specific vibration frequency range) cannot provide corresponding or real-time adjustment according to the change in vibration frequency, and thus can no longer provide satisfactory damping effects. Specifically, these technical solutions are often optimized for a certain specific frequency range during design. Therefore, when facing vibration frequencies outside this range, the damping effect will be greatly reduced. This not only affects the comfort of passengers / operators during riding, but may also have potential negative impacts on their health, especially when riding for a long time under harsh working conditions. Therefore, it is particularly important to develop a seat back vibration damping technology that can adapt to a wider range of vibration frequencies.

[0006] To solve these problems, magnetorheological dampers have emerged and can be used as magnetorheological shock absorbers. Magnetorheological dampers have a wide range of damping force adjustment capabilities and can be flexibly adjusted according to different working conditions and vibration frequencies, so as to achieve the best damping effect. Through a large range of attenuation, magnetorheological dampers can significantly reduce / buffer the vibrations of the seat back under various working conditions and improve the comfort and safety of riding. Magnetorheological fluid is an intelligent material, and its rheological properties can change significantly under the action of an external magnetic field. By controlling the magnetic field intensity, the viscosity and stiffness of the magnetorheological fluid can be adjusted in real time, thereby changing the damping characteristics of the damper. This kind of magnetorheological shock absorber has the advantages of fast response speed and adjustable damping force, and can effectively improve the comfort of the seat.

[0007] The information included in this background art section of the present utility model specification, including any references cited herein and any of their descriptions or discussions, is included only for the purpose of technical reference and is not considered to be the subject matter limiting the scope of the present utility model. Summary of the Utility Model

[0008] In view of the above and other more ideas, the present utility model is proposed.

[0009] One of the objectives of the present utility model is to propose a novel seat back magnetorheological damper, which can be applied to a seat back and is used to provide more effective real-time adjustable active seat back vibration damping. It can, in an active vibration damping control manner, adjust in real time the magnitude and amplitude of the front-to-back inclination angle (or pitching angle) of the seat back according to the vibration / impact experienced by the seat, so as to achieve better buffering and vibration damping purposes and effects. Specifically, when the seat is subjected to vibration or impact, the seat back will experience a series of changes during the vibration or impact process, which involve changes in the angle of the seat back and changes in the vibration / (front-to-back) swaying frequency. During the vibration or impact process of the seat back, the inclination angle (relative to the seat cushion) will change accordingly, and at the same time, the frequency of vibration / swaying will also change. In order to improve the stability and comfort of the seat during the vibration process, the seat back magnetorheological damper of the present utility model actively and real-time adjusts the damping force of the magnetorheological damper through active vibration damping / buffering control technology, so as to effectively suppress or partially absorb / counteract the angle and frequency changes of the seat back vibration / swaying.

[0010] More specifically, according to one aspect of the present utility model, there is provided a seat back magnetorheological damper, which includes: at least one magnetorheological damper installed to be operably connected to the seat back and configured to provide vibration damping or buffering for the seat back; and at least one sensor installed in cooperation with the at least one magnetorheological damper and configured to collect or monitor data related to the vibration or swaying of the seat back; wherein, the at least one magnetorheological damper includes at least one of a magnetorheological rotary damper and a piston-type magnetorheological damper.

[0011] According to an embodiment, the at least one magnetorheological damper includes two magnetorheological rotary dampers, wherein each magnetorheological rotary damper includes: a connecting swing arm, one end of which is operably connected to the rotating shaft of the magnetorheological rotary damper and can swing as it rotates; and a connecting slider, which is pivotally installed at or near the opposite end of the connecting swing arm.

[0012] According to an embodiment, the seat back magnetorheological damper further includes a connecting chute integrally integrated or fixed as a separate component on the seat back, wherein the connecting slider is slidably connected in the connecting chute, and the sliding movement of the connecting slider in the connecting chute will cause a change in the distance between the seat back and the magnetorheological damper.

[0013] According to an embodiment, the two magnetorheological rotary dampers are installed side by side on a fixed bracket.

[0014] According to an embodiment, the seat back magnetorheological damper is fixed to the mounting position by a damper mounting bracket.

[0015] According to one embodiment, the mounting portion is a seat cushion, a seat base or a seat mounting bracket matched with the seat back.

[0016] According to an embodiment, the at least one sensor includes a first sensor fixed to the seat back, and a second sensor fixed together with the at least one magnetorheological damper.

[0017] According to an embodiment, the first sensor is selected from one of an acceleration sensor, a displacement sensor, and an angle sensor; and the second sensor is selected from one of an acceleration sensor, a displacement sensor, and an angle sensor.

[0018] According to one embodiment, the seat back magnetorheological damper also includes a control system, which is configured to collect and process signals from the sensor, and calculate, judge and output an excitation current to the seat back magnetorheological damper through an algorithm to adjust the damping of the magnetorheological damper in real time to perform active vibration reduction control of the seat back.

[0019] According to one embodiment, the control system includes: a central processing unit or a micro control unit, which is configured to calculate and regulate the size of the output current through an algorithm; a signal processing circuit, which is configured to process the signal or data from the sensor and transmit it to the central processing unit or the micro control unit; an isolation circuit, which is configured to provide protection for the central processing unit or the micro control unit; and a feedback loop, which is configured to provide closed-loop control of the output current.

[0020] According to an embodiment, the magnetorheological rotation damper is an automatically resettable magnetorheological rotation damper.

[0021] According to an embodiment, a magnetorheological rotary damper includes a magnetorheological rotary mechanism and a reset assembly; the magnetorheological rotary mechanism includes a rotary shaft, rotary vanes, and a magnetorheological assembly; one end of the rotary shaft is an external connection end and is arranged outside the magnetorheological assembly, while the other end is an insertion end and penetrates through the magnetorheological assembly; a receiving cavity is arranged inside the magnetorheological assembly; magnetorheological fluid is filled in the receiving cavity; the rotary vanes are arranged inside the receiving cavity and are connected to the rotary shaft; excitation coils are circumferentially arranged on the inner wall of the receiving cavity; the excitation coils are connected to an external power supply through wires; a liquid passing gap is arranged between the rotary vanes and the excitation coils; a keyway is arranged on the axial side surface of the rotary shaft, one end of the keyway communicates with the end of the external connection end of the rotary shaft, and the other end is a closed end; a first installation groove is arranged on the keyway and is close to the closed end; an arc-shaped limiting groove and an arc-shaped limiting platform are arranged on the circumferential side surface of the rotary shaft close to the closed end of the keyway; both ends of the limiting groove are connected to both ends of the limiting platform to form a circumferential structure; the top surface of the limiting platform is not higher than the side surface of the rotary shaft; a sliding groove communicating with the limiting groove is arranged on the axial side surface of the rotary shaft; the end of the sliding groove far from the limiting groove communicates with the end of the external connection end of the rotary shaft; the reset assembly includes a fixed disk, an elastic member, and a limiting disk; the fixed disk is an annular disk, and a second installation groove is arranged on its inner wall surface; the fixed disk is detachably connected to the magnetorheological assembly; the elastic member is a circumferential structure and is arranged between the rotary shaft and the fixed disk; one end of the elastic member is connected to the first installation groove on the rotary shaft, and the other end is connected to the second installation groove on the fixed disk; the limiting disk is an annular disk, and a convex platform adapted to the sliding groove is arranged on its inner wall surface; the limiting disk is arranged in the limiting groove and is located between the fixed disk and the magnetorheological assembly and is detachably connected to both of them.

[0022] According to an embodiment, the magnetorheological rotary damper capable of automatic reset further includes an angle sensor and a main control unit; the angle sensor is arranged opposite to the insertion end of the rotary shaft; the angle sensor is connected to the main control unit through a data line.

[0023] According to an embodiment, the magnetorheological rotary damper capable of automatic reset further includes a lower cover; the lower cover is arranged on one side of the magnetorheological assembly close to the insertion end of the rotary shaft and encloses a first installation cavity with the magnetorheological assembly; the angle sensor is arranged in the first installation cavity and is connected to the lower cover.

[0024] According to an embodiment, the magnetorheological rotary damper capable of automatic reset further includes an upper cover; the upper cover is arranged on one side of the magnetorheological assembly close to the external connection end of the rotary shaft and encloses a second installation cavity with the magnetorheological assembly; an installation through hole is arranged on the upper cover; the external connection end of the rotary shaft penetrates through the installation through hole and is arranged outside the upper cover; the reset assembly is arranged in the second installation cavity.

[0025] According to an embodiment, the magnetorheological component includes an upper magnetic conductive end cover and a lower magnetic conductive end cover. The upper magnetic conductive end cover is disposed on the lower magnetic conductive end cover, and a receiving cavity is formed therebetween; a first mounting hole is provided on the upper magnetic conductive end cover; a second mounting hole is provided on the lower magnetic conductive end cover; an insertion end of a rotating shaft penetrates through the first mounting hole and the second mounting hole; the magnetorheological component further includes an upper magnetic isolation end cover and a lower magnetic isolation end cover; the upper magnetic isolation end cover is connected to the upper magnetic conductive end cover; the lower magnetic isolation end cover is connected to the lower magnetic conductive end cover; a third mounting hole is provided on the upper magnetic isolation end cover; a fourth mounting hole is provided on the lower magnetic isolation end cover; an insertion end of the rotating shaft penetrates through the third mounting hole and the fourth mounting hole.

[0026] According to an embodiment, the magnetorheological component further includes a first oil seal and a second oil seal; the first oil seal is circumferentially disposed on the inner wall of the first mounting hole and is in fit with the rotating shaft; the second oil seal is circumferentially disposed on the inner wall of the second mounting hole and is in fit with the rotating shaft; the magnetorheological component further includes a sealing ring; the sealing ring is disposed at the connection position between the upper magnetic conductive end cover and the lower magnetic conductive end cover.

[0027] According to an embodiment, the magnetorheological component further includes a first bearing and a second bearing; the first bearing is circumferentially disposed on the inner wall of the third mounting hole and is in contact with the rotating shaft; the second bearing is circumferentially disposed on the inner wall of the fourth mounting hole and is in contact with the rotating shaft; the magnetorheological component further includes a first snap ring and a second snap ring; a first clamping groove is provided at one end of the third mounting hole away from the upper magnetic conductive end cover; the first snap ring is disposed in the first clamping groove and is in fit with the first bearing; a second clamping groove is provided at one end of the fourth mounting hole away from the lower magnetic conductive end cover; the second snap ring is disposed in the second clamping groove and is in fit with the second bearing.

[0028] According to an embodiment, both the third mounting hole and the fourth mounting hole are stepped holes; a first step is provided at one end of the third mounting hole close to the upper magnetic conductive end cover; the first step is in fit with one end of the first bearing away from the first snap ring; a second step is provided at one end of the fourth mounting hole close to the lower magnetic conductive end cover; the second step is in fit with one end of the second bearing away from the second snap ring; a first circumferential protrusion is provided on the shaft section of the rotating shaft in contact with the first step; the first circumferential protrusion and the first step form a combined step and are in fit with one end of the first bearing away from the first snap ring; a second circumferential protrusion is provided on the shaft section of the rotating shaft in contact with the second step; the second circumferential protrusion and the second step form a combined step and are in fit with one end of the second bearing away from the second snap ring; the first circumferential protrusion and the second circumferential protrusion are integrally formed on the rotating shaft.

[0029] According to an embodiment, the elastic member includes any one of a clockwork spring and a torsion spring.

[0030] According to another aspect of the present utility model, there is also disclosed an application or use of a seat back magnetorheological shock absorber equipped with a magnetorheological damper and a sensor in the shock absorption or buffering of a seat back, wherein the seat back is a part of a seat installed in an automobile, a ship, an airplane, an engineering vehicle, a cab of a rail transit vehicle, a cab of a construction machinery, or an operation room of an industrial processing equipment.

[0031] According to an embodiment, the seat back magnetorheological shock absorber is the seat back magnetorheological shock absorber as described above.

[0032] Compared with the existing technology, the beneficial effects achievable according to one or more embodiments of the technical solution and inventive concept of the present utility model are as follows:

[0033] The present utility model applies magnetorheological technology to the field of seat back shock absorption, and for the first time realizes active shock absorption control of the seat back in a convenient, simply equipped and miniaturized manner. By introducing the magnetorheological damper, it becomes possible to effectively and real-time buffer control and adjust the vibration of the seat back, improving the riding comfort of passengers.

[0034] The present utility model proposes a magnetorheological control system applied to seat back shock absorption. The control system can adopt an intelligent control algorithm, and can automatically and actively adjust the damping parameters according to factors such as the weight of passengers and seat usage habits, so as to achieve the best shock absorption effect and meet the needs of different passengers and application scenarios.

[0035] The magnetorheological control system of the present utility model can adopt a closed-loop control method. It collects vibration information through sensors, then calculates and outputs a control current through a controller to drive the flow of magnetorheological fluid, realizing real-time adjustment of the damping force and improving the control accuracy and response speed.

[0036] The magnetorheological control system of the present utility model has an adaptive function, and can real-time adjust the damping parameters according to the dynamic changes of passengers and / or application scenarios, providing a more personalized shock absorption experience and further improving the riding comfort of passengers.

[0037] More embodiments of the present utility model can also achieve other beneficial technical effects not listed one by one. Some of these other technical effects may be described hereinafter, and are predictable and understandable by those skilled in the art after reading the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] By referring to the following description in conjunction with the drawings, these features and advantages of these embodiments and other features and advantages and the manner of achieving them will become more apparent, and the embodiments of the present utility model can be better understood. In the drawings:

[0039] Figure 1 is applicable to Figures 2-3 a schematic cross-sectional structure diagram of an automatically resettable magnetorheological rotary damper of the seat-back magnetorheological damper shown in

[0040] Figure 2 a schematic diagram of the structure and installation configuration of a seat-back magnetorheological damper installed on a seat-back according to the first embodiment of the present utility model.

[0041] Figure 3 is Figure 2 a separately enlarged schematic diagram of the seat-back magnetorheological damper shown in Figure 2 schematically showing the main structure of the seat-back magnetorheological damper shown in

[0042] Figure 4 is applicable to Figures 2-3 a schematic block diagram of the control logic of a control system of the seat-back magnetorheological damper shown in

[0043] Figure 5 is applicable to Figures 2-3 a schematic diagram of a control flow of a control system of the seat-back magnetorheological damper shown in Detailed implementation manners

[0044] In the following descriptions of the drawings and the detailed implementation manners, details of one or more embodiments of the present utility model will be elaborated. From these descriptions, the drawings, and the claims, other features, objectives, and advantages of the present utility model can be clearly understood.

[0045] It should be understood that the embodiments illustrated and described are not limited to the details of the structure and arrangement of the components set forth in the following descriptions or illustrated in the drawings. The illustrated embodiments can be other embodiments and can be implemented or executed in various ways. Each example is provided by way of explanation rather than limitation of the disclosed embodiments. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present utility model without departing from the scope or essence of the disclosure of the present utility model. For example, features illustrated or described as part of one embodiment can be used with another embodiment to still produce additional embodiments. Therefore, the disclosure of the present utility model covers such modifications and variations that fall within the scope of the appended claims and their equivalent elements.

[0046] Similarly, it can be understood that the phrases and terms used herein are for the purpose of description and should not be considered restrictive. The use of "including", "comprising", or "having" herein is intended to open-endedly include the items listed thereafter, their equivalents, and additional items.

[0047] The present invention will be described in more detail below with reference to specific embodiments of the present invention.

[0048] Magnetorheological rotary damper for the seat back magnetorheological shock absorber of the present utility model

[0049] An embodiment of the magnetorheological rotary damper of the seat back magnetorheological shock absorber applicable to the present invention can be seen in the "Magnetorheological Rotary Damper and Application Method" of the invention patent application with the application number 2024110978762 submitted by the same applicant on August 12, 2024. The entire content of this invention patent application is incorporated into this application by reference as if it were described in this application.

[0050] Specifically, as Figure 1 shown, Figure 1 is the sectional structure schematic diagram of the embodiment of the magnetorheological rotary damper with automatic reset that can be used in the Figures 2-3 shown seat back magnetorheological shock absorber of the present invention.

[0051] As Figure 1 schematically shown, there is shown a magnetorheological rotary damper with automatic reset that can be used in the Figures 2-3 shown seat back magnetorheological shock absorber (i.e., the magnetorheological rotary damper labeled 31 as described hereinafter). It may include a magnetorheological rotary mechanism and a reset assembly. The magnetorheological rotary mechanism may include a rotary shaft 1 (which may be a magnetic isolation material, for example), a rotary vane 2 (which may be a magnetic conductive material, for example), and a magnetorheological assembly; one end of the rotary shaft 1 is an external connection end and is arranged outside the magnetorheological assembly, while the other end is an insertion end and penetrates through the magnetorheological assembly; a receiving cavity is arranged inside the magnetorheological assembly; magnetorheological fluid is filled in the receiving cavity; the rotary vane 2 is arranged in the receiving cavity and is connected to the rotary shaft 1; an excitation coil 3 is circumferentially arranged on the inner wall of the receiving cavity; the excitation coil 3 is connected to an external power supply through a wire; a fluid passing gap is arranged between the rotary vane 2 and the excitation coil 3;

[0052] As Figure 1As shown, the reset component may include a fixed disk 4, an elastic member 5 (specifically a clockwork spring 5, which may include a body, an inner flat portion and an outer flat portion connected to the body), and a limit disk 6; the fixed disk 4 is an annular disk, and a second installation groove may be provided on its inner wall surface; the fixed disk 4 is detachably connected to the magnetorheological component (such as bolt connection); the elastic member is a circumferential structure and is arranged between the rotating shaft 1 and the fixed disk 4; one end of the elastic member (specifically the inner flat portion) is connected to the first installation groove on the rotating shaft 1, and the other end (specifically the outer flat portion) is connected to the second installation groove on the fixed disk 4; the limit disk 6 is an annular disk, and a boss adapted to the sliding groove is provided on its inner wall surface, and the limit disk 6 slides along the sliding groove to the limit groove through the boss; the limit disk 6 is located between the fixed disk 4 and the magnetorheological component and is detachably connected to both (such as bolt connection). When the rotating shaft 1 rotates until the limit table contacts the boss, the rotating shaft 1 stops rotating; the elastic member is in a stretched state; during reset, the elastic member in the stretched state has a resilience force to drive the rotating shaft 1 to reset.

[0053] The magnetorheological rotary damper capable of automatic reset may further include an angle sensor 7 and a main controller (not shown in the figure); the angle sensor 7 is arranged opposite to the inserted end of the rotating shaft 1; the angle sensor 7 is connected to the main controller through a data line.

[0054] The magnetorheological rotary damper capable of automatic reset may further include a lower end cover 8; the lower end cover 8 is arranged on one side of the magnetorheological component close to the inserted end of the rotating shaft 1 and encloses a first installation cavity with the magnetorheological component; the angle sensor 7 is arranged in the first installation cavity and is connected to the lower end cover 8.

[0055] The magnetorheological rotary damper capable of automatic reset may further include an upper end cover 9, the upper end cover 9 is arranged on one side of the magnetorheological component close to the external connection end of the rotating shaft 1 and encloses a second installation cavity with the magnetorheological component; an installation through hole is provided on the upper end cover 9; the external connection end of the rotating shaft 1 passes through the installation through hole and is arranged outside the upper end cover 9; the reset component is arranged in the second installation cavity.

[0056] The magnetorheological component may include an upper magnetic conductive end cover 10 (for example, it may be a magnetic conductive material) and a lower magnetic conductive end cover 11 (for example, it may be a magnetic conductive material), the upper magnetic conductive end cover 10 is arranged on the lower magnetic conductive end cover 11, and a receiving cavity is formed between the two; a first installation hole is provided on the upper magnetic conductive end cover 10; a second installation hole is provided on the lower magnetic conductive end cover 11; the inserted end of the rotating shaft 1 passes through the first installation hole and the second installation hole and is arranged.

[0057] The magnetorheological assembly may further include an upper magnetic isolation end cap 12 (made of magnetic isolation material) and an upper magnetic isolation end cap 13 (made of magnetic isolation material); the upper magnetic isolation end cap 12 is connected to the upper magnetic conduction end cap 10; the upper magnetic isolation end cap 13 is connected to the lower magnetic conduction end cap 11; a third mounting hole is provided on the upper magnetic isolation end cap 12; a fourth mounting hole is provided on the upper magnetic isolation end cap 13; the insertion end of the rotating shaft 1 penetrates through the third mounting hole and the fourth mounting hole.

[0058] The magnetorheological assembly may further include a first oil seal 14 and a second oil seal 15; the first oil seal 14 is circumferentially arranged on the inner wall of the first mounting hole and is in fit with the rotating shaft 1 to prevent the magnetorheological fluid from flowing out; the second oil seal 15 is circumferentially arranged on the inner wall of the second mounting hole and is in fit with the rotating shaft 1 to prevent the magnetorheological fluid from flowing out.

[0059] The magnetorheological assembly may further include a sealing ring 16; the sealing ring 16 is arranged at the connection position between the upper magnetic conduction end cap 10 and the lower magnetic conduction end cap 11 to prevent the magnetorheological fluid from flowing out.

[0060] The magnetorheological assembly may further include a first bearing 17 and a second bearing 18; the first bearing 17 is circumferentially arranged on the inner wall of the third mounting hole and is in contact with the rotating shaft 1; the second bearing 18 is circumferentially arranged on the inner wall of the fourth mounting hole and is in contact with the rotating shaft 1.

[0061] The magnetorheological assembly may further include a first snap ring 19 and a second snap ring 20; a first clamping groove is provided at one end of the third mounting hole far from the upper magnetic conduction end cap 10; the first snap ring 19 is arranged in the first clamping groove and is in fit with the first bearing 17; a second clamping groove is provided at one end of the fourth mounting hole far from the lower magnetic conduction end cap 11; the second snap ring 20 is arranged in the second clamping groove and is in fit with the second bearing 18.

[0062] Both the above-mentioned third mounting hole and the fourth mounting hole may be stepped holes; a first step is provided at one end of the third mounting hole close to the upper magnetic conduction end cap 10; the first step is in fit with one end of the first bearing 17 far from the first snap ring 19 to facilitate the positioning of the first bearing 17; a second step is provided at one end of the fourth mounting hole close to the lower magnetic conduction end cap 11; the second step is in fit with one end of the second bearing 18 far from the second snap ring 20 to facilitate the positioning of the second bearing 18.

[0063] A first circumferential protrusion may be provided on the shaft section of the rotating shaft 1 in contact with the first step; the first circumferential protrusion and the first step form a combined step and are in fit with one end of the first bearing 17 far from the first snap ring 19 to improve the positioning effect on the first bearing 17.

[0064] A second circumferential protrusion may be provided on the shaft section of the rotating shaft 1 in contact with the second step; the second circumferential protrusion and the second step form a combined step, and are arranged in contact with one end of the second bearing 18 away from the second snap spring 20, improving the limiting effect on the second bearing 18. The first circumferential protrusion and the second circumferential protrusion may be integrally formed on the rotating shaft 1.

[0065] For example, an example of the operation of a magnetorheological rotary damper that can be automatically reset may include the following steps: Step S1, fixedly connecting the magnetorheological component to an external device using a connecting member (such as a bolt); connecting the device or its components or connecting components to be vibration-damped in the external device to the rotating shaft 1 through a key shaft inserted into, for example, a keyway on the rotating shaft 1; Step S2, when the device to be vibration-damped vibrates under an external force, the device or its components or connecting components drive the rotating shaft 1 to rotate, and the angular velocity sensor 7 monitors the rotational angular velocity of the rotating shaft 1 in real time; the main control unit adjusts and controls the magnitude of the current flowing into the excitation coil 3 based on the rotational angular velocity information collected by the angular velocity sensor 7, that is, by changing the magnitude of the excitation current to change the viscosity and stiffness of the magnetic fluid and thereby correspondingly change the rotational damping force, achieving a vibration damping or buffering effect on the device to be vibration-damped. Among them, for example, in the damping vibration reduction operation, when the rotating shaft 1 rotates to, for example, the limiting platform in contact with the convex platform, the rotating shaft 1 stops rotating, and the damping force is constantly applied as a fixed value; the elastic member is in a stretched state; Step S3, at the end of the damping vibration reduction operation, the main control unit stops passing current into the excitation coil 3; the elastic member in the stretched state provides a restoring force to drive the rotating shaft 1 to reset.

[0066] Piston-type magnetorheological damper for the seat back magnetorheological shock absorber of the present utility model

[0067] The magnetorheological damper that can be used in the seat back magnetorheological damper of the present invention can also be a piston-type magnetorheological damper. An embodiment of the piston-type magnetorheological damper can be seen in the adjustable magnetorheological damper described in the utility model patent "Sitting Posture Trainer with Magnetorheological Adjustable Damping" with the application date of July 20, 2020 and the patent number of ZL 202021430248.9 owned by the same applicant. The content related to the adjustable magnetorheological damper in this utility model patent is incorporated into this application by reference as if it were described in this application.

[0068] First embodiment of the seat back magnetorheological shock absorber

[0069] Figure 2 It is a schematic diagram of the structure and installation configuration of the seat back magnetorheological damper installed on the seat back according to the first embodiment of the present invention. It can adopt, for example, but not limited to Figure 1 the magnetorheological rotary damper shown (that is, the magnetorheological rotary damper 31 described below) as one of its main working components. Figure 3 is Figure 2An enlarged schematic view of the seat back magnetorheological shock absorber shown, schematically showing Figure 2 the main structure of the seat back magnetorheological shock absorber shown.

[0070] As Figures 1-3 schematically shown, the seat back magnetorheological shock absorber 21 (specifically, the magnetorheological damper) according to the first embodiment of the present invention can be fixed to the installation site (such as the seat cushion or the base bracket of the seat, etc.) through, for example, the shock absorber mounting bracket 25 and operably connected to the back surface of the seat back 22 (i.e., the other side opposite to the side in contact with the back of the occupant) to provide shock absorption or buffering for it. Specifically, the seat back 22 is arranged to be pivotable relative to the seat cushion (i.e., pivotable forward and backward relative to the seat cushion), and the magnetorheological shock absorber 21 provides real-time, variable amplitude and frequency displacements in the opposite direction to, for example, the vibration or forward and backward swaying of the seat or the seat cushion, so as to at least partially suppress or cancel the vibration or forward and backward tilting movement of the seat or the seat cushion, thereby achieving the purpose of suppressing and buffering the vibration or forward and backward tilting movement of the seat back 22 in real time, as detailed below.

[0071] The seat back magnetorheological damper 21 may include two parallel magnetorheological rotary dampers mounted on a fixed bracket 32 ​​as damping adjustment actuators, such as two magnetorheological rotary dampers 31 as described above. Each magnetorheological rotary damper 31 is provided with a connecting swing arm 33, one end of which is operably connected (e.g., fixedly connected) to the rotating shaft 1 and can swing with its rotational movement, and a connecting slider 34 pivotally mounted (e.g., connected by a pin) at the other end of the connecting swing arm 33 or in the vicinity thereof. The connecting slider 34 is slidably connected to a connecting slide groove 35, for example, fixed to the seat back 22 or integrated with it or as a part thereof, for example, it can slide smoothly when it is stuck in the connecting slide groove 35. When the seat back 22 vibrates or tilts forward and backward, the connecting swing arm 33 drives the rotating shaft 1 to generate corresponding rotational movement. Since the magnetorheological fluid inside the magnetorheological rotational damper 31 can instantaneously change its rheological characteristics by controlling the magnetic field (specifically, for example, the excitation current), thereby causing an instantaneous change in the rotational damping force, the rotational damping force of the magnetorheological rotational damper 31 can be conveniently adjusted by electronic control, and then the direction, amplitude and frequency of the swing of the connecting swing arm 33 can be adjusted in real time and instantaneously to provide a real-time, variable amplitude and frequency suppression or offset displacement in the opposite direction of the vibration or fore-and-aft tilting movement of the seat or seat cushion, thereby adjusting the amplitude and frequency of the vibration or fore-and-aft tilting movement of the seat back 22, so as to achieve the purpose of real-time suppression and buffering of the vibration or fore-and-aft tilting movement of the seat back 22, thereby improving the riding comfort of the passengers, and even in situations such as uneven road surface, strong winds and waves when sailing on a ship, large-scale bumps and pitching of vehicles and ships, and significant fore-and-aft tilting of the seat, it can effectively and real-time provide effective buffering effect.

[0072] In order to accurately control the damping force, the seat back magnetorheological damper 21 may also include a control system, which uses sensors, such as but not limited to sensors 23, 24 (such as but not limited to gyroscopes, travel sensors, angle sensors) installed together with the seat back magnetorheological damper 21 and operably connected directly or indirectly thereto, to collect and monitor the vibration state (including forward and backward tilting movement) and related parameters (such as but not limited to angular velocity, tilt angle, displacement, etc.) of the seat back in real time, and make corresponding processing and control (the specific control logic can refer to the control system described below). Among them, Figure 1 As shown, the sensor 23 can be fixed on the seat back magnetorheological damper 21 or its damper mounting bracket 25, and the sensor 24 can be fixed on the back of the seat back 22. The sensors can be used to collect data such as but not limited to acceleration, displacement, vibration amplitude, frequency, etc.

[0073] The control system can also be configured to transmit a control signal to the magnetorheological rotary damper, for example, by changing the excitation current to drive the internal electromagnetic coil to generate a corresponding controllably variable magnetic field. The change in the magnetic field strength can cause an adjustable change in the viscosity and stiffness of the magnetorheological fluid (and thus the rotational damping), thereby correspondingly changing and adjusting the damping characteristics of the damper. In this way, the vibration of the seat back can be suppressed and buffered in real time and effectively, thereby improving the comfort of the occupants (such as drivers, pilots, passengers, operators, etc.).

[0074] In addition, the entire seat back magnetorheological shock absorber 21 can also be configured to have an adaptive function. Among them, its control system is configured to be able to automatically adjust the damping parameters according to factors such as the weight of the occupants and the seat usage habits, etc., in order to achieve the best shock absorption and buffering effects. This intelligent design makes the seat back magnetorheological shock absorber 21 more user-friendly and can meet the needs of different passengers and different application scenarios.

[0075] In short, by introducing the cooperation of the magnetorheological rotary damper and the intelligent control system, the seat back magnetorheological shock absorber 21 can achieve effective and real-time shock absorption control and buffering effects, thereby providing a more comfortable, safe and longer-lasting riding experience for the occupants.

[0076] The following combines the attached Figures 4-5 to further describe the control system of the seat back magnetorheological shock absorber.

[0077] Figure 4 is applicable to Figures 2-3 The schematic block diagram of the control logic of the control system of the seat back magnetorheological shock absorber 21 shown.

[0078] As Figure 4 shown, the control system of the seat back magnetorheological shock absorber 21 can include a controller with a central processing unit CPU or a micro control unit MCU, and several sensors. The sensors transmit the collected and detected relevant signals to the signal processing circuit of the controller to perform operations such as filtering on the signals, and process the signals into signals that meet the input specifications of the controller. The controller is configured to efficiently collect and process the input signals, and can calculate the signals from the sensors through, for example, algorithms, and can control the current output through, for example (but not limited to), pulse width modulation (PWM) control method. By adjusting the width of the pulse signal, PWM can accurately control the magnitude and stability of the current output to, for example, at least one magnetorheological rotary damper 31, as Figure 4As shown. In addition, an isolation circuit (such as an optocoupler isolation circuit) can be set up to protect the controller, and a feedback loop can also be set up so that the output current can be controlled in a closed loop using hardware. The controller can adopt, for example, PWM control (pulse width modulation, an analog control method) to ensure that the current is output according to the algorithm instructions, such as Figure 4 as shown.

[0079] The above control system can be configured with an acceleration sensor, or a displacement sensor, or two acceleration sensors / gyroscopes (such as the above sensors 23, 24), or a combination of an acceleration and a displacement sensor (such as the above sensors 23 and 24).

[0080] In terms of intelligent control, the above control system can automatically adjust the damping parameters according to factors such as the weight of the passenger and the seat usage habits, so as to achieve the best vibration damping effect and meet the needs of different passengers.

[0081] In terms of real-time dynamic control, the above control system can use, for example, the skyhook algorithm model to calculate and achieve dynamic control according to the information dynamically collected and transmitted by the sensors, improving the accuracy and stability of the control. Through this automatically resetable magnetorheological rotary damper, effective control of the vibration of the seat back can be achieved, providing a more comfortable and safe riding experience for passengers.

[0082] According to an example, the CPU or microcontrol unit MCU of the controller can calculate using, for example, the skyhook algorithm model according to information such as real-time dynamic sensing signals (such as parameters) from the sensors, realize real-time regulation of the magnetorheological rotation damping, and finally realize real-time and dynamic suppression / buffering control of the vibration of the seat back. For example, the basic formula and principle of the skyhook algorithm are as follows:

[0083] If V2(V2 - V1) ≥ 0, then F = f(I)

[0084] If V2(V2 - V1) < 0, then F = 0.

[0085] Where I is the current, V2 is the displacement speed of the seat back (such as the seat back 22), and V1 is the displacement speed of the shock absorber mounting bracket (such as the shock absorber mounting bracket 25). It should be noted that the two speed values of V1 and V2 are not directly measured, but are the results obtained by the controller calculating the sensor signals using an algorithm. When the calculated V2 value is less than V1, it indicates that the controller is in the 0 current output state, that is, the magnetorheological damper is in its initial damping force mode. On the contrary, if the calculated V2 value is greater than or equal to V1, the controller will adjust the magnitude of the output current I according to the difference between V2 and V1. This adjustment can be functional, and then the damping force F of the magnetorheological damper is adjusted and controlled accordingly with the change of the current I.

[0086] Combined with the foregoing description and Figures 4-5 , an exemplary control process of the controller of the control system of the seat back magnetorheological shock absorber 21 is further described.

[0087] Figure 5 is applicable to Figures 2-3 a schematic diagram of a control process of the control system of the seat back magnetorheological shock absorber 21 shown. As Figure 5 shown, when the seat back magnetorheological shock absorber 21 of the present embodiment works, sensors (such as sensors 23, 24) collect relevant data and transmit the collected data to the signal processing circuit of the controller in the form of input signals. The signal processing circuit can perform operations such as filtering on the signals, process the signals into signals that conform to the input specifications of the controller, and transmit them to the central processor (or MCU) of the controller. The central processor (or MCU) calculates and judges the magnitude of the output current value through a control algorithm, and can conveniently and real-time regulate the output (excitation) current through, for example, PWM (pulse width modulation) combined with, for example, a bridge drive circuit, and then real-time regulate and change the magnetic field applied to the magnetorheological damper 31, and further regulate the change of the rotational damping; among them, the sampling resistor can feedback the output current, making it possible to perform closed-loop control on the output current.

[0088] Moreover, due to the inherent characteristics of the magnetorheological technology, in the design of the magnetorheological rotary damper of the seat back magnetorheological shock absorber 21 of the present invention, the rotational damping force magnitude and damping curve of the magnetorheological rotary damper can be controlled and adjusted in an accurate, instantaneous and quantifiable electro-control manner to provide various electro-adjustable and electro-controlled characteristics such as damping, buffering, shock absorption, etc.; the regulation of the rotational damping force magnitude and damping curve can be accurate and real-time, and can provide an extremely fast response, such as in milliseconds.

[0089] Second embodiment of the seat back magnetorheological shock absorber

[0090] Instead of the magnetorheological rotary damper 31 in the first embodiment, the seat back magnetorheological shock absorber of this second embodiment is configured with a piston-type magnetorheological damper, such as the piston-type magnetorheological damper described above, and a corresponding control system. Since the magnetorheological fluid inside the piston-type magnetorheological damper can instantaneously change its rheological properties through the control of the magnetic field, resulting in an instantaneous change in the damping force, it is thus possible to conveniently adjust the magnitude of the damping force of the piston-type magnetorheological damper through electric control. Furthermore, the piston movement can be adjusted in real time and instantaneously to control or at least partially counteract the vibration or forward and backward tilting movement of the seat back 22 in the opposite direction, thereby achieving the purpose of suppressing and buffering the vibration or forward and backward tilting movement of the seat back 22 in real time, and further improving the riding comfort of the passenger. By configuring a corresponding control system, the above basic utility model concept and corresponding technical effects of this second embodiment can be realized.

[0091] Compared with the prior art, according to one or more embodiments and concepts of the technical solution of the present utility model, the main technical problems solved are as follows:

[0092] 1. Solved the problem that the traditional seat shock absorption system cannot actively control shock absorption / buffering and cannot adjust the damping force in real time. By collecting the vibration amplitude and frequency through sensors, the controller controls the magnitude of the input current of the magnetorheological damper, thereby adjusting the damping torque of the damper in real time, and improving the response speed and comfort of the seat shock absorption.

[0093] 2. Solved the problem that the traditional seat shock absorption system cannot meet the needs of different passengers. By introducing an intelligent control unit, the controller can automatically adjust the damping parameters according to factors such as the weight of the passenger and the seat usage habits, so as to achieve the best shock absorption effect and meet the needs of different passengers.

[0094] 3. Solved the problems existing in the control method of the existing magnetorheological shock absorber. This technical solution adopts a closed-loop control method, and the output current is closed-loop controlled by hardware to ensure that the current is output according to the algorithm instructions, improving the control accuracy and stability, and realizing the precise control of vibration.

[0095] Due to the advancement of this technical solution, it can be widely applied in application fields such as automobiles, ships, aerospace, engineering vehicles, and rail transit.

[0096] In the field of transportation such as automobiles and ships, with the continuous improvement of people's requirements for riding comfort, the application of magnetorheological technology in the field of seat back vibration damping has broad prospects. Through the introduction of magnetorheological dampers and the cooperation of intelligent control units, the seat vibration damping system can effectively control vibrations, providing a more comfortable and safe riding experience for passengers. In addition, due to the advantages of magnetorheological dampers such as fast response speed and adjustable damping force, they can adapt to different road, water area, climate conditions and driving modes, further improving the comfort and safety of riding in automobiles and ships.

[0097] In addition, the present utility model has applicable application scenarios in the fields of aviation, aerospace, rail transit, engineering vehicles, working vehicles, etc., improving the comfort and safety of passengers and enhancing the usage experience.

[0098] Generally speaking, the application of magnetorheological technology in the field of seat back vibration damping has broad prospects, with a large market demand, and is expected to become the mainstream technology of future seat vibration damping systems.

[0099] The foregoing description of several embodiments of the present utility model has been presented for purposes of illustration. The foregoing description is not intended to be exhaustive nor to limit the present utility model to the precise steps and / or forms disclosed. Obviously, many modifications and variations are possible in light of the above teachings. The scope of the present utility model and all equivalents are intended to be defined by the appended claims.

Claims

1. A magnetorheological damper for a seat back, characterized in that: The seat back magnetorheological damper comprises: at least one magnetorheological damper mounted in operative connection with the seat back and configured to provide vibration reduction or cushioning for the seat back; and at least one sensor mounted in conjunction with the at least one magnetorheological damper and configured to collect or monitor data related to vibration or shaking of the seat back; Wherein, the at least one magnetorheological damper comprises two magnetorheological rotation dampers, each of the magnetorheological rotation dampers comprises: a connecting swing arm, one end of which is operably connected to the rotation axis of the magnetorheological rotation damper and can swing with the rotation of the magnetorheological rotation damper; and a connecting slider, which is pivotally mounted at or near the other end opposite to the connecting swing arm; and Among them, the seat back magnetorheological damper also includes a connecting slide groove that is integrally integrated in or fixed on the seat back as a separate component, wherein the connecting slider is slidably connected in the connecting slide groove, whereby the sliding movement of the connecting slider in the connecting slide groove will cause the distance of the seat back relative to the magnetorheological damper to change.

2. The magnetorheological damper for the seat back according to claim 1, characterized in that: The two magnetorheological rotation dampers are arranged in parallel and installed on a fixed bracket.

3. The magnetorheological damper for seat back according to any one of claims 1 to 2, characterized in that: The seat back magnetorheological damper is fixed at the installation position through a damper installation bracket.

4. The magnetorheological damper for the seat back according to claim 3, characterized in that: The installation part is a seat cushion, a seat base or a seat installation bracket matched with the seat back.

5. The magnetorheological damper for a seat back according to any one of claims 1 to 3, characterized in that: The at least one sensor includes a first sensor fixed to the seat back, and a second sensor fixed together with the at least one magnetorheological damper.

6. The magnetorheological damper for the seat back according to claim 5, characterized in that: The first sensor is selected from one of an acceleration sensor, a displacement sensor, and an angle sensor; and the second sensor is selected from one of an acceleration sensor, a displacement sensor, and an angle sensor.

7. The magnetorheological damper for a seat back according to any one of claims 1 to 3, characterized in that: The seat back magnetorheological damper also includes a control system, which is configured to collect and process signals from the sensor, and calculate, judge and output an excitation current to the seat back magnetorheological damper through an algorithm to adjust the damping of the magnetorheological damper in real time to perform active vibration reduction control of the seat back.

8. The magnetorheological damper for the seat back according to claim 7, characterized in that: The control system comprises: A central processing unit or micro control unit configured to calculate and regulate the magnitude of the output current through an algorithm; A signal processing circuit configured to process the signal or data from the sensor and transmit it to the central processor or micro control unit; an isolation circuit configured to provide protection for the central processing unit or micro control unit; and A feedback loop is configured to provide closed-loop control of the output current.

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