High static low dynamic damper

Abstract

The embodiment of the application provides a high-static-low-dynamic vibration damper, and belongs to the technical field of vibration dampers. The high-static-low-dynamic vibration damper comprises a body, and the body comprises a spring steel structure which is enclosed by one spring steel sheet and has an isosceles trapezoidal cross section. The high-static-low-dynamic vibration damper has a simple structure, can meet the stiffness requirement of high static stiffness and low dynamic stiffness, and optimizes the damping effect of a train under the no-load or light-load working condition.

Description

Technical Field

[0001] This application relates to the field of vibration damper technology, and more specifically, to a high static and low dynamic vibration damper. Background Technology

[0002] With the continuous increase in the speed of China's high-speed railways, the vibrations and their transmission during train operation are becoming increasingly severe. Effectively reducing vibration transmission during train operation is crucial for improving passenger comfort. Existing high-static-low-dynamic vibration dampers generally use damping rubber, which provides good vibration reduction under heavy load conditions. However, due to the material properties of damping rubber itself, its vibration reduction effect is poor under unloaded or lightly loaded conditions, failing to meet the needs of actual operation. Summary of the Invention

[0003] This application provides a high static stiffness and low dynamic stiffness vibration damper, which can achieve the stiffness requirements of high static stiffness and low dynamic stiffness, and optimize the vibration reduction effect of trains under no-load or light-load conditions.

[0004] The high static and low dynamic vibration damper includes a body, which comprises a spring steel structure formed by a spring steel sheet enclosing an isosceles trapezoidal cross section.

[0005] In this scheme, the vibration damper is constructed by using a spring steel structure with an isosceles trapezoidal cross-section, which is formed by spring steel sheets. The buckling effect of the two trapezoidal walls in the spring steel structure under pressure is utilized. When the force ratio is small, the deformation of the spring steel structure increases very little. When the buckling point (i.e., the turning point of static bearing capacity) is reached, the deformation increment increases, thereby achieving the characteristics of high static and low dynamic, and optimizing the vibration reduction effect of the train under no-load or light-load conditions.

[0006] In some embodiments, the spring steel structure includes a top wall, a bottom wall, and two side walls, with a deformation cavity formed between the top wall, the bottom wall, and the two side walls. The body also includes a load-bearing joint disposed on the top surface of the top wall, which is used to bear external forces and transmit the external forces to the spring steel structure.

[0007] In the above technical solution, a load-bearing joint is provided on the top wall of the spring steel structure, which can play the role of force transmission.

[0008] The two free ends of the spring steel sheet can be fixed by welding or by gluing. The weld or glue joint of the spring steel sheet can be located on the centerline of the bottom wall of the spring steel structure or other positions.

[0009] In some embodiments, the two free ends of the spring steel sheet are welded and fixed, and the weld point of the spring steel sheet is located at the centerline of the bottom wall of the spring steel structure.

[0010] In the above technical solution, by placing the weld points of the two free ends of the spring steel sheet on the centerline of the bottom wall of the spring steel structure, the stress stability of the spring steel structure is improved, and the probability of the spring steel structure tilting is reduced.

[0011] In some embodiments, the angle between the bottom wall and the side wall ranges from 3° to 45°.

[0012] In the above technical solution, by adjusting the inclination angle of the bottom wall and the side wall in the spring steel structure, the point of application of the buckling force of the spring steel structure can be different, and the inclination angle range can be approximately between 3° and 45°, thereby forming a turning point of static bearing capacity and achieving high static stiffness.

[0013] In some embodiments, the body includes a rubber layer disposed on the inner and / or outer side of the spring steel structure.

[0014] In the above technical solution, by providing a rubber layer on the inner and / or outer side of the spring steel structure, the rubber layer not only provides damping for the main body, but also effectively suppresses the resonance of the spring steel sheet.

[0015] In some embodiments, the rubber layer is made of rubber, and the hardness of the rubber ranges from 40 to 70 Shore A.

[0016] In the above technical solution, adjusting the hardness of the rubber layer can be used to change the tilt angle of the spring steel structure. By controlling the hardness range of the rubber to 40-70 Shore A, the spring steel structure can have a lower dynamic stiffness.

[0017] In some embodiments, the number of bodies is set to multiple, and the multiple bodies are distributed at intervals along their length direction and / or width direction.

[0018] In the above technical solution, by connecting two or more bodies in parallel in the vibration damper, the load-bearing capacity of the vibration damper can be improved by the cooperation of multiple bodies, thereby enabling the vibration damper to be applicable to vibration reduction requirements in a wider range of load conditions.

[0019] In some embodiments, the number of bodies is set to multiple, and the multiple bodies are distributed overlappingly along their height direction. The multiple bodies include a bottom body and multiple upper bodies located above the bottom body. Each of the multiple upper bodies has a blocking member in its deformation cavity. The blocking member is used to limit the deformation displacement of the top wall of the upper body to maintain it within a preset range.

[0020] In the above technical solution, by connecting two or more bodies in series, and the thickness of the spring steel sheets in each body can be different, and after the upper body is equipped with a blocking component, the vibration damper can achieve a multi-level quasi-zero stiffness characteristic in the overall load-displacement curve of the structure, and has a wider range of applications.

[0021] In some embodiments, the body further includes a rubber damper located within the deformation cavity of the spring steel structure, the rubber damper being disposed on the bottom wall, and a gap being formed between the top surface of the rubber damper and the top wall of the spring steel structure.

[0022] In the above technical solution, the combination of spring steel structure and rubber vibration damping components can significantly improve the vibration reduction effect of the train under no-load or light-load conditions, thereby improving the stability of train operation and the comfort of passengers.

[0023] In some embodiments, the high static and low dynamic vibration damper further includes a mounting base with a mounting cavity inside, the main body being installed in the mounting cavity, and a clearance hole for the bearing joint to extend from the top of the mounting base, the bearing joint being used to contact the pressure cap under pressure.

[0024] In the above technical solution, the mounting base is used for mounting the main body. The top of the mounting base is provided with a clearance hole for the bearing joint to extend. The clearance hole can limit the bearing joint, so as to constrain the pressure plate and the bearing joint in all degrees of freedom except the vertical direction, and ensure that the spring steel structure of the shock absorber will not overturn.

[0025] The beneficial effects of this solution are as follows: The high static stiffness and low dynamic stiffness of the vibration damper are achieved through a simple structure and modular assembly, reducing manufacturing difficulty. The high static stiffness and low dynamic stiffness vibration damper is also very flexible in practical applications; multiple spring steel structures can be connected in series to achieve multi-level stiffness requirements, or connected in parallel to improve load-bearing capacity. By utilizing the high static stiffness and low dynamic stiffness characteristics of the spring steel structure within the damper, it not only ensures the static load-bearing capacity of high-speed trains from unloaded to lightly loaded conditions but also significantly reduces system stiffness and natural frequency, improving the low-frequency vibration isolation performance of vehicles under low-load operating conditions.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the main body of a high static and low dynamic vibration damper provided in some embodiments of this application;

[0029] Figure 2This application provides structural schematic diagrams of two bodies in parallel configuration as shown in some embodiments.

[0030] Figure 3 This is a schematic diagram of the structure of two bodies in series as provided in some embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of a high static and low dynamic vibration damper provided in some embodiments of this application;

[0032] Figure 5 Stiffness curves of trapezoidal spring steel structures provided in some embodiments of this application;

[0033] Figure 6 The high static and low dynamic vibration damper provided in some embodiments of this application is a vibration isolator stiffness curve diagram of two bodies connected in series;

[0034] Figure 7 The load-displacement curves of the trapezoidal spring steel structure provided in some embodiments of this application show the relationship between the angles of the two sides.

[0035] Figure 8 The load-displacement curves of trapezoidal spring steel structures provided in some embodiments of this application show the relationship between load and displacement and structural thickness.

[0036] Figure 9 A comparison chart of load-displacement curves between the vibration damper provided in this application embodiment and the linear vibration isolator in the prior art.

[0037] Icons: 10-Main body; 11-Spring steel structure; 110-Top wall; 111-Bottom wall; 112-Side wall; 113-Deformation cavity; 12-Bearing joint; 13-Rubber layer; 131-Inner rubber layer; 132-Outer rubber layer; 14-Rubber damping component; 140-Rectangular support seat; 141-Bearing rubber block; 142-Rubber block support; 20-Mounting seat; 21-Base; 22-Top cover; 23-Pressure cover; 30-Upper body; 40-Lowest body; 50-Blocking component; 60-Floating support plate; 100-Damper. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Example

[0044] This application provides a high static and low dynamic vibration damper. Please refer to [link / reference]. Figures 1 to 9 The high static and low dynamic vibration damper 100 includes a body 10, which includes a spring steel structure 11 formed by a spring steel sheet and having an isosceles trapezoidal cross-section.

[0045] In this scheme, the vibration damper 100 is constructed by using a spring steel structure 11 with an isosceles trapezoidal cross-section, which is formed by spring steel sheets. The buckling effect of the two trapezoidal wall plates in the spring steel structure 11 under pressure is utilized. When the force ratio is small, the gradient of the deformation of the spring steel structure 11 is very small. When the buckling point (i.e. the turning point of static bearing capacity) is reached, the deformation increment increases, thereby achieving the characteristics of high static and low dynamic, and optimizing the vibration reduction effect of the train under no-load or light-load conditions.

[0046] Understandably, spring steel sheets, or spring steel, primarily possess good elasticity. Since they operate under dynamic load conditions, the most important requirements for the material used to manufacture springs are high yield strength; no plastic deformation under heavy loads; high fatigue strength; long service life under repeated loads; and sufficient toughness and plasticity to prevent sudden brittle fracture under impact. Figure 5 The stiffness curve of the trapezoidal spring steel structure 11 is shown.

[0047] The spring steel structure 11 can adjust the thickness of the spring steel sheets to adjust the static load-bearing capacity inflection point of the vibration damper 100. The thickness of the spring steel sheets is approximately 0.1-0.3 mm, thereby achieving the adjustment of the static stiffness of the spring steel structure 11. Figure 8 The load-displacement curve of the spring steel structure 11 is illustrated in relation to the structural thickness. Furthermore, the tilt angle of the platform area is altered by adjusting the height of the spring steel structure 11, and the height range is related to the width of the spring steel structure 11, thus giving the spring steel structure 11 a low dynamic stiffness. The dimensions of the spring steel structure 11 are designed differently depending on the installation environment of the vibration damper 100, allowing for flexible selection of the height of the trapezoidal spring steel structure 11. For vibration dampers currently used in high-speed trains, the height of the spring steel structure 11 for sidewall vibration dampers is approximately 7mm, while the height of the spring steel structure 11 for floor vibration dampers is approximately 40mm. For special applications, the height of the spring steel structure 11 can be 500mm. In summary, the height of the spring steel structure 11 is approximately between 7mm and 500mm, and can be selected based on the specific height and width to achieve good high static and low dynamic stiffness characteristics.

[0048] In some embodiments, please refer to Figure 1 The spring steel structure 11 includes a top wall 110, a bottom wall 111, and two side walls 112. A deformation cavity 113 is formed between the top wall 110, the bottom wall 111, and the two side walls 112. The length of the top wall 110 is less than the length of the bottom wall 111. The body 10 also includes a load-bearing joint 12, which is disposed on the top surface of the top wall 110. The load-bearing joint 12 is used to bear external forces and transmit the external forces to the spring steel structure 11. By providing the load-bearing joint 12 on the top wall 110 of the spring steel structure 11, the load-bearing joint 12 can perform the function of force transmission.

[0049] The two free ends of the spring steel sheet can be fixed by welding or by gluing. The weld or gluing point of the spring steel sheet can be located on the centerline of the bottom wall of the spring steel structure 11 or other positions.

[0050] Optionally, the two free ends of the spring steel sheet are welded and fixed, with the weld point located on the centerline of the bottom wall 111 of the spring steel structure 11. By welding and fixing the two free ends of the spring steel sheet, the welded connection has high stability, and the weld point of the spring steel sheet is located on the centerline of the bottom wall 111 of the spring steel structure 11, making the stress stability of the spring steel structure 11 higher and reducing the probability of the spring steel structure 11 tilting.

[0051] In some embodiments, the angle between the bottom wall 111 and the side wall 112 ranges from 3° to 45°. By adjusting the inclination angle between the bottom wall 111 and the side wall 112 in the spring steel structure 11, the point of application of the buckling force in the spring steel structure 11 can be made different, with the inclination angle range approximately between 3° and 45°, thereby forming a static load-bearing capacity inflection point and achieving high static stiffness. Figure 7 The load-displacement curve of spring steel structure 11 is shown as a function of the angle between the two sides (12°-27°).

[0052] In some embodiments, please refer to Figure 1 The body 10 includes a rubber layer 13, which is disposed on the inner and / or outer side of the spring steel structure 11. By providing the rubber layer 13 on the inner and / or outer side of the spring steel structure 11, the rubber layer 13 not only provides damping for the body 10, but also effectively suppresses the resonance of the spring steel sheet.

[0053] Understandably, a rubber layer 13 can be provided on the inner side of the spring steel structure 11, or on the outer side of the spring steel structure 11, or on both the inner and outer sides of the spring steel structure 11, depending on the actual situation. In this embodiment, an inner rubber layer 131 is provided on the inner side of the spring steel structure 11, and an outer rubber layer 132 is also provided on the outer side of the spring steel structure 11. The ratio of the thickness of the rubber layer 13 to the thickness of the spring steel sheet is in the range of 1.5-3 times.

[0054] The rubber layer 13 can be made of rubber or other damping materials.

[0055] For example, the rubber layer 13 is made of rubber, and the hardness of the rubber ranges from 40 to 70 Shore A. Adjusting the hardness of the rubber layer 13 can be used to change the tilt angle of the spring steel structure 11. By controlling the hardness range of the rubber to 40-70 Shore A, the spring steel structure 11 can have a lower dynamic stiffness.

[0056] Specifically, if the rubber's hardness is too high, it may not provide sufficient cushioning and damping when subjected to impact or vibration, thus affecting its ability to absorb vibration and impact. This can lead to stress concentration, damage, or cracking. Excessive hardness also makes the rubber material more rigid and brittle, lacking sufficient tensile and tear resistance, which may also cause the material to easily break or crack under tension or stress. Conversely, a damper 100 with too low hardness may not provide sufficient stiffness and support to effectively isolate vibration and impact, and insufficient hardness may lead to excessive deformation and compression, reducing the vibration isolation effect, and allowing vibration and impact to be transmitted to other parts. In summary, the hardness range of rubber is approximately 40-70 Shore A. For applications like the damper 100, the selection of rubber hardness should consider the requirements for achieving the desired vibration isolation effect. Generally, lower hardness rubber materials usually have better vibration isolation performance and can better buffer vibration and impact. Therefore, softer rubber is mainly used for low-frequency vibration and low-load applications, while harder rubber is suitable for high-frequency vibration and high-load applications. The selection of rubber hardness should be tested and evaluated in conjunction with the actual situation to ensure that the required vibration isolation effect is achieved.

[0057] The vibration damper 100 can have multiple bodies 10, which can be distributed along the length and / or width direction, or overlapped along the height direction, depending on the actual situation.

[0058] For example, the number of bodies 10 is set to multiple, and the multiple bodies 10 are distributed at intervals along their length and / or width directions. By connecting two or more bodies 10 in parallel in the vibration damper 100, the multiple bodies 10 cooperate to improve the load-bearing capacity of the vibration damper 100, thereby enabling the vibration damper 100 to be applicable to vibration damping requirements within a wider range of load conditions. In this embodiment, Figure 2 The diagram illustrates the structure of two bodies 10 connected in parallel.

[0059] For example, the number of bodies 10 is set to multiple, and the multiple bodies 10 are distributed overlappingly along their height direction. The multiple bodies 10 include a bottom body 40 and multiple upper bodies 30 located above the bottom body 40. Each of the deformation cavities 113 of the multiple upper bodies 30 is provided with a blocking member 50. The blocking member 50 is used to limit the deformation displacement of the top wall 110 of the upper body 30 to maintain it within a preset range. A floating support plate 60 can be provided between two adjacent bodies 10. By connecting two or more bodies 10 in series, and the thickness of the spring steel sheet in each body 10 can be different, after the upper body 30 is equipped with the blocking member 50, the vibration damper 100 can achieve a multi-level quasi-zero stiffness characteristic in the overall load-displacement curve of the structure, and has a wider range of applications. In this embodiment, Figure 3The diagram illustrates the structure of two bodies 10 connected in series. Figure 6 The stiffness curves of the two bodies 10 in series are shown.

[0060] In some embodiments, please refer to Figure 4 The main body 10 also includes a rubber damping element 14, which is located within the deformation cavity 113 of the spring steel structure 11. The rubber damping element 14 is disposed on the bottom wall 111, and there is a gap between the top surface of the rubber damping element 14 and the top wall 110 of the spring steel structure 11. By cooperating with the spring steel structure 11 and the rubber damping element 14, the vibration reduction effect of the train under no-load or light-load conditions can be significantly improved, thereby improving the smoothness of train operation and the riding comfort of passengers.

[0061] Specifically, taking the body 10 with rubber damping element 14 as an example when applied to a train, when the train is under no-load and light-load conditions, the spring steel structure 11 in the body 10 is in a low-stiffness compression state and bears the load alone. The damper 100 works near the equilibrium position, with a low natural frequency and high load-bearing capacity, which is beneficial for expanding the vibration isolation frequency range and realizing low-frequency vibration control. When the train load increases, the top wall 110 of the spring steel structure 11 is pressed down to contact the rubber damping element 14. The spring steel structure 11 and the rubber damping element 14 are connected in parallel, and both bear the load together, thereby ensuring that the compression of the spring steel structure 11 does not exceed the limit, and also improving the service life of the rubber layer 13 and spring steel sheet in the spring steel structure 11.

[0062] Among them, such as Figure 4 As shown, the rubber damping component 14 can be sequentially divided into a rectangular support 140, a bearing rubber block 141, and a rubber block support 142 from top to bottom. The rubber block support 142 is in contact with the top surface of the bottom wall 111 of the spring steel structure 11. The top surface of the rectangular support 140 and the top wall 110 of the spring steel structure 11 have a gap, and the value of the gap can be determined according to the actual situation.

[0063] In some embodiments, please refer to Figure 4 The high static and low dynamic vibration damper 100 also includes a mounting base 20, which has a mounting cavity. The main body 10 is installed in the mounting cavity. The top of the mounting base 20 has a clearance hole for the bearing joint 12 to extend out. The bearing joint 12 is used to contact the pressure cap 23. The mounting base 20 is used to install the main body 10. The clearance hole on the top of the mounting base 20 can limit the bearing joint 12 to constrain the pressure cap 23 and the bearing joint 12 in all degrees of freedom except the vertical direction, so as to ensure that the spring steel structure 11 of the vibration damper 100 will not overturn.

[0064] The mounting base 20 includes a base 21 and a top cover 22, with a mounting cavity formed between the top cover 22 and the base 21, and an clearance hole is opened in the top cover 22.

[0065] like Figure 9 As shown, a comparison diagram of the load-displacement curves of the vibration damper 100 in this solution and the linear vibration isolator in the prior art is presented. The new vibration isolator is the high static and low dynamic vibration damper 100 in this application. By comparing the new vibration isolator with the traditional linear vibration isolator, it can be seen that the vibration damper 100 utilizes the high static and low dynamic characteristics of the spring steel structure 11 in the body 10 to not only ensure the static load capacity of the high-speed train from no load to light load, but also significantly reduce the system stiffness and natural frequency, thereby improving the low-frequency vibration isolation performance of the vehicle under low load operating conditions.

[0066] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high static and low dynamic vibration damper, characterized in that, Includes a body, the body comprising a spring steel structure formed by a spring steel sheet enclosing an isosceles trapezoidal cross-section; The spring steel structure includes a top wall, a bottom wall, and two side walls, and a deformation cavity is formed between the top wall, the bottom wall, and the two side walls. The main body also includes a rubber vibration damper, which is located in the deformation cavity of the spring steel structure. The rubber vibration damper is disposed on the bottom wall, and there is a gap between the top surface of the rubber vibration damper and the top wall of the spring steel structure. When the train is in an unloaded or lightly loaded condition, the spring steel structure is in a low-stiffness compression state and bears the load alone. When the load on the train increases, the top wall of the spring steel structure is pressed down to contact the rubber damper. The spring steel structure and the rubber damper are connected in parallel and share the load.

2. The high static low dynamic vibration damper according to claim 1, characterized in that, The main body also includes a load-bearing joint, which is disposed on the top surface of the top wall. The load-bearing joint is used to bear external forces and transmit the external forces to the spring steel structure.

3. The high static low dynamic vibration damper according to claim 2, characterized in that, The two free ends of the spring steel sheet are welded and fixed, and the weld point of the spring steel sheet is located on the centerline of the bottom wall of the spring steel structure.

4. The high static low dynamic vibration damper according to claim 2, characterized in that, The angle between the bottom wall and the side wall ranges from 3° to 45°.

5. The high static and low dynamic vibration damper according to claim 1, characterized in that, The body also includes a rubber layer, which is disposed on the inner and / or outer side of the spring steel structure.

6. The high static and low dynamic vibration damper according to claim 5, characterized in that, The rubber layer is made of rubber, and the hardness of the rubber ranges from 40 to 70 Shore A.

7. The high static low dynamic vibration damper according to any one of claims 1-6, characterized in that, The number of the bodies is set to multiple, and the multiple bodies are distributed at intervals along their length direction and / or width direction.

8. The high static low dynamic vibration damper according to any one of claims 1-6, characterized in that, The number of the main bodies is set to multiple, and the multiple main bodies are distributed overlappingly along their height direction. The multiple main bodies include a bottommost main body and multiple upper main bodies located above the bottommost main body. Each of the multiple upper main bodies is provided with a blocking member in its deformation cavity. The blocking member is used to limit the deformation displacement of the top wall of the upper main body to maintain it within a preset range.

9. The high static low dynamic vibration damper according to claim 1, characterized in that, The vibration damper includes a mounting base with a mounting cavity inside. The main body is mounted in the mounting cavity. The top of the mounting base has a clearance hole for the bearing joint to extend out. The bearing joint is used to contact the pressure cap when pressure is applied.

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