Floor vibration damping structure and rail vehicle

Abstract

This invention provides a floor vibration damping structure and a rail vehicle. Multiple through holes are spaced apart along the floor's extension direction in the vibration damping body. Each through hole has a first inner wall and a second inner wall arranged opposite to each other along the expansion and contraction direction of the vibration damping body. The first and second inner walls have a separated state and an abutting state. In the separated state, the vibration damping body provides a first elastic force to the floor. When the vibration damping body is subjected to increased pressure, the first and second inner walls are in the abutting state, and the vibration damping body provides a second elastic force to the floor. By designing the vibration damping body with holes, a high-stiffness elastic body with low stiffness design is achieved, which is beneficial for reducing in-vehicle noise. It also achieves a variable stiffness design; that is, when the hole is compressed, it provides low-stiffness vibration damping support. When subjected to a large external load or passenger jumping impact load, the first and second inner walls are in the abutting state, the hole closes, and high-stiffness support is achieved, preventing excessive floor subsidence that could lead to floor damage. This improves vibration damping efficiency while satisfying lateral support stability.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology for rail vehicles, and more particularly to a floor vibration reduction structure and a rail vehicle. Background Technology

[0002] The interior floor of a rail vehicle is installed on the vehicle body floor using elastic dampers. These elastic dampers reduce the transmission of vehicle body vibrations into the vehicle interior, and generally, the lower the stiffness, the higher the damping efficiency.

[0003] However, traditional rubber vibration dampers, in pursuit of low stiffness design, require the use of rubber elastomers with low stiffness, resulting in low tangential stiffness of the rubber, which cannot meet the lateral stability requirements of vehicles. To achieve different stiffness requirements, rubber vibration dampers need to be formulated with different methods to adjust hardness and stiffness, which is costly. Therefore, there is currently a lack of floor vibration damping devices that can meet the requirements of efficient vibration reduction while ensuring lateral support stability. Summary of the Invention

[0004] This invention provides a floor vibration damping structure and a rail vehicle to solve the defect of insufficient lateral support stability caused by the low stiffness of rubber vibration dampers in the prior art, and to achieve efficient vibration damping of the floor vibration damping structure while improving the lateral support stability of the vibration damper.

[0005] This invention provides a floor vibration damping structure, comprising:

[0006] A vibration damping body is provided with a plurality of through holes spaced apart along the extension direction of the floor, and each through hole has a first inner wall and a second inner wall that are arranged opposite to each other along the extension and contraction direction of the vibration damping body.

[0007] The first inner wall and the second inner wall are in a separated state and an abutting state;

[0008] In the separated state, the vibration damping body provides a first elastic force to the floor;

[0009] In the contact state, the vibration damping body provides a second elastic force to the floor;

[0010] The second elastic force is greater than the first elastic force.

[0011] According to one embodiment of the present invention, along the extension and retraction direction of the vibration damping body, the vibration damping body is provided with multiple rows of first through holes and at least one row of second through holes. Each row of first through holes and each row of second through holes are arranged along the extension direction of the floor. A row of second through holes is provided between each two adjacent rows of first through holes, and each second through hole is staggered with two adjacent first through holes along the extension direction of the floor.

[0012] According to one embodiment of the present invention, along the extension direction of the floor, the length of the second through hole is greater than the distance between two adjacent first through holes.

[0013] According to one embodiment of the present invention, the distance between the first inner wall and the second inner wall is less than the length of the through hole along the floor extension direction.

[0014] According to one embodiment of the present invention, the distance between the first inner wall and the second inner wall gradually decreases from both sides of the through hole toward the center of the through hole.

[0015] According to one embodiment of the present invention, the first inner wall and the second inner wall are arcuate surfaces that convex toward each other.

[0016] According to one embodiment of the present invention, the two side surfaces of the through hole connecting the first inner wall and the second inner wall are arc surfaces.

[0017] According to one embodiment of the present invention, the side surface of the vibration damping body is provided with an opening groove, and the axis of the opening groove is parallel to the axis of the through hole.

[0018] According to one embodiment of the present invention, a first mounting seat is provided at one end of the vibration damping body along its extension direction for connecting the interior floor, and a second mounting seat is provided at the other end of the vibration damping body along its extension direction for connecting the vehicle body floor.

[0019] The present invention also provides a rail vehicle, including an interior floor and a body floor, wherein a floor vibration damping structure as described above is provided between the interior floor and the body floor.

[0020] The floor vibration damping structure and rail vehicle provided by this invention utilize through holes arranged along the floor extension direction in the vibration damping body. These through holes have a first inner wall and a second inner wall arranged opposite to each other along the expansion and contraction direction of the vibration damping body. The first and second inner walls have a separated state and an abutting state. In the separated state, the vibration damping body provides a first elastic force to the floor. When the vibration damping body is subjected to increased pressure, the first and second inner walls abut each other, providing a second elastic force to the floor. By designing the vibration damping body with holes, a high-stiffness elastic body with low stiffness is achieved, which helps reduce in-vehicle noise. It also achieves a variable stiffness design; that is, when the hole is compressed, it provides low-stiffness vibration damping support. When subjected to large external loads or passenger jumping impact loads, the first and second inner walls abut each other, the hole closes, and high-stiffness support is achieved, preventing excessive floor subsidence that could lead to floor damage. This design achieves both low-frequency vibration damping performance and maintains tangential stiffness, improving vibration damping efficiency while satisfying lateral support stability, and effectively adapting to the tangential stiffness requirements of vehicles on curved road sections. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the floor vibration reduction structure provided by the present invention;

[0023] Figure 2 yes Figure 1 Sectional view of AA in the middle;

[0024] Figure 3 This is a top view of the floor vibration reduction structure provided by the present invention;

[0025] Figure 4 This is a schematic diagram of the through hole provided by the present invention.

[0026] Figure label:

[0027] 100, Vibration damping body; 200, Through hole; 210, First inner wall; 220, Second inner wall; 300, Opening groove; 400, First mounting base; 500, Second mounting base; 510, Mounting hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do 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, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0031] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] The following is combined Figures 1-4 Specific embodiments of the present invention are described below:

[0034] This invention provides a floor vibration damping structure, including a vibration damping body 100, which is installed on the vehicle floor. The upper end of the vibration damping body 100 can be fitted with an interior floor, and the vibration damping effect of the vehicle interior floor is achieved through the elastic expansion and contraction of the vibration damping body 100.

[0035] like Figure 1As shown, the vibration damping body 100 has a plurality of through holes 200 penetrating the vibration damping body 100. The plurality of through holes 200 are parallel to each other and are arranged along the extension direction of the floor. The through holes 200 have a first inner wall 210 and a second inner wall 220 arranged opposite to each other along the extension direction of the vibration damping body 100. That is, the through holes 200 are arranged horizontally, the first inner wall 210 is the upper surface of the through hole 200 and the first inner wall 210 is close to the interior floor, and the second inner wall 220 is the lower surface of the through hole 200 and the second inner wall 220 is close to the vehicle floor.

[0036] The vibration damping body 100 is compressed by the interior floor vibration. The compression of the damping body 100 under pressure allows the first inner wall 210 and the second inner wall 220 to be in a separated state and an abutting state. In the separated state, the through hole 200 is open, and the first inner wall 210 and the second inner wall 220 are separated from each other with a gap between them; in the abutting state, the first inner wall 210 and the second inner wall 220 are fitted together and abutted, and the through hole 200 is closed.

[0037] In this embodiment, the interior floor, vehicle body floor, and vibration damping body 100 are typically arranged horizontally. Therefore, the horizontal direction of the vibration damping body 100 is considered as transverse, and the direction of compression and contraction of the vibration damping body 100 is considered as tangential. The through hole 200 on the vibration damping body 100 reduces the stiffness of the vibration damping body 100 in its tangential direction. With reduced stiffness, the vibration damping efficiency of the vibration damping body 100 is improved. Therefore, when the vibration damping body 100 is under pressure, the through hole 200 begins to contract. From the start of contraction of the through hole 200 until it is completely closed, the first inner wall 210 and the second inner wall 220 are both in a separated state. In this state, the interior pressure plate squeezes the vibration damping body 100, and the vibration damping body 100 provides a first elastic force to the interior floor. The first elastic force also increases with the pressure, and the degree of contraction of the through hole 200 changes. During this process, the vibration damping body 100 exhibits low stiffness and high-efficiency vibration damping performance.

[0038] When the pressure on the vibration damping body 100 increases, the through hole 200 contracts until it is completely closed. At this time, the first inner wall 210 and the second inner wall 220 abut against each other, and the through hole 200 no longer provides a buffer space for the vibration damping body 100. The vibration damping contraction of the vibration damping body 100 is entirely carried out by the body of the vibration damping body 100. At this time, the working stiffness of the vibration damping body 100 is supported by the high stiffness of the base material. The vibration damping body 100 provides a second elastic force to the floor. The second elastic force is significantly greater than the first elastic force and can support greater pressure, preventing the interior floor from sinking too much.

[0039] Therefore, this embodiment achieves a high-stiffness elastomer with low stiffness by designing openings in the vibration damping body, which helps reduce in-vehicle noise. It also realizes a variable stiffness design for the vibration damper, namely, high-efficiency vibration damping with low stiffness under normal load, and high-stiffness overload protection under overload, achieving high-stiffness support and avoiding excessive floor subsidence that could lead to floor damage. It achieves both low-frequency vibration damping performance and tangential stiffness without reduction, improving vibration damping efficiency while meeting lateral support stability, and better adapting to the tangential stiffness requirements of vehicles on curved road sections.

[0040] In this embodiment, along the extension and retraction direction of the vibration damping body 100, the vibration damping body 100 is provided with multiple rows of first through holes and at least one row of second through holes. Each row of first through holes and each row of second through holes are arranged along the extension direction of the floor. A row of second through holes is provided between each two adjacent rows of first through holes, and each second through hole is staggered with the two adjacent first through holes along the extension direction of the floor.

[0041] In one embodiment, along the direction of floor extension, the length of the second through hole is greater than the distance between two adjacent first through holes. For example... Figure 1 As shown, the two adjacent through holes 200 at different positions above and below are arranged in an alternating manner. That is, the lower through hole 200 is correspondingly set in the gap between the two adjacent upper through holes 200, and the two ends of the lower through hole 200 extend to the lower ends of the two adjacent upper through holes 200 respectively. Thus, the length of the through hole 200 can be set to be greater than the distance between the two adjacent through holes 200 in the horizontal direction. In this way, it is ensured that the vibration damping body 100 is provided with through holes 200 in any vertical direction, and the overall vibration damping effect of the vibration damping body 100 in its extension and contraction direction is guaranteed.

[0042] like Figure 1 and Figure 4 As shown, in this embodiment, the distance h between the first inner wall 210 and the second inner wall 220 is less than the length of the through hole 200 along the extension direction of the floor, so that the through hole 200 becomes a flat shape. The flat shape of the through hole 200 is conducive to the contraction of the vibration damping body 100 in the tangential direction, while ensuring the lateral support stability of the vibration damping body 100, so as to realize the efficient vibration damping of the floor vibration damping structure while improving the lateral support stability of the vibration damper.

[0043] like Figure 4 As shown, in one embodiment, the distance between the first inner wall 210 and the second inner wall 220 gradually decreases from both sides of the through hole 200 towards the center of the through hole 200. This design, combined with the flat shape of the through hole 200, facilitates the shrinkage and deformation of the through hole 200, thereby improving the low stiffness and high-efficiency vibration damping performance of the damper.

[0044] In one embodiment, the first inner wall 210 and the second inner wall 220 are respectively arc surfaces. When the first inner wall 210 and the second inner wall 220 come into contact, the first inner wall 210 and the second inner wall 220 gradually come into contact and abut from the middle to both sides, and the contact area gradually increases, so as to achieve a smooth transition of the extrusion of the through hole 200.

[0045] like Figure 4 As shown, in one embodiment, the two sides of the through hole 200 connecting the first inner wall 210 and the second inner wall 220 are arc surfaces. The arc surfaces on both sides of the through hole 200 facilitate the deformation of the through hole 200 under pressure and prevent the through hole 200 from cracking and being damaged.

[0046] In one embodiment, the first inner wall 210 and the second inner wall 220 are respectively planes with a length of d2, ensuring that the first inner wall 210 and the second inner wall 220 are completely fitted together, thereby improving the flatness of the closed through hole 200.

[0047] like Figure 4 As shown, the main parameters of the through hole 200 include R - circle radius, d1 - circle distance, d2 - straight line segment length, and h - height. By setting the above parameters, different vibration reduction performances can be achieved.

[0048] like Figure 2 As shown, in this embodiment, multiple through holes 200 are provided along the extension and retraction direction of the damping body 100 to improve the damping strength of the damping body 100; multiple through holes 200 can also be arranged along the extension direction of the floor to achieve a low stiffness damping effect on the entire damping plane of the damper.

[0049] The number, size, and density of the through holes 200 in this embodiment can be adjusted according to actual vibration reduction requirements. Increasing the number, size, and density of the through holes 200 can improve the vibration reduction performance of the damper with low stiffness and high efficiency.

[0050] like Figure 1 As shown, in one embodiment, the side surface of the vibration damping body 100 is provided with an opening groove 300, which is parallel to the axis of the through hole 200. The opening groove 300 has the same function as the through hole 200. The opening groove 300 is provided at the edge of the vibration damping body 100 to prevent the surface of the vibration damping body 100 from deforming when squeezed, reduce the vertical stiffness of the edge of the vibration damping body 100, and improve the vibration damping performance under small loads.

[0051] In this embodiment, the through holes 200 can be arranged periodically to achieve vibration reduction performance in a specific frequency band, or they can be arranged irregularly according to actual needs.

[0052] In one embodiment, a first damping zone and a second damping zone can be provided in the damping body 100. The density of the through holes 200 in the first damping zone and the second damping zone is different, the size of the through holes 200 in the first damping zone and the second damping zone is different, and their number can also be set differently. The first damping zone and the second damping zone have different damping performance.

[0053] Therefore, different opening designs can be made at different locations of the same vibration damping body 100 so that the vibration damping body 100 has different vibration damping areas, thereby improving the different vibration damping requirements of the interior floor.

[0054] like Figure 3 As shown, in one embodiment, the vibration damping body 100 has a first mounting seat 400 at one end along its extension direction for connecting to the interior floor, and a second mounting seat 500 at the other end along its extension direction for connecting to the vehicle floor. Both ends of the second mounting seat 500 extend out of the vibration damping body 100, and these extended portions serve as mounting parts. Their surfaces are provided with mounting holes 510 for bolting to the vehicle floor. The first mounting seat 400 can be bolted to the interior floor or directly overlapped with it.

[0055] In this embodiment, the vibration damping body 100, the first mounting base 400, and the second mounting base 500 can be integrated by means of adhesive bonding, mechanical fixing, or vulcanization.

[0056] In this embodiment, the vibration damping body 100 can be made of polymer material or metal material to improve the vibration damper's adaptability to environments such as high temperature, low temperature, oil stains, and rubber aging, and has higher adaptability to harsh environments and high and low temperature adaptability.

[0057] This invention also provides a rail vehicle, which has an interior floor and a body floor, with a floor vibration damping structure as mentioned in the above embodiments provided between the interior floor and the body floor.

[0058] When the interior floor is under load, the damping body is compressed by 100%, and the through-hole 200 begins to close. Before the through-hole 200 closes, the damper exhibits low stiffness and high-efficiency damping performance. When subjected to excessive load or impact load (such as passenger bouncing), the through-hole 200 closes, and the damper's working stiffness at this time is the high-stiffness support of the base material, preventing excessive floor subsidence that could lead to floor damage. The maximum floor subsidence is approximately h. This achieves a variable stiffness design for the damper: low stiffness for high-efficiency damping under normal loads, and high stiffness for overload protection under overload conditions.

[0059] When designing a vibration damper, the base material (which can be metal or various polymer materials) and elastic modulus can be selected based on the actual working conditions, such as the application environment (e.g., operating temperature, presence of oil stains, etc.) and lateral stiffness requirements. Then, the size, quantity, and arrangement of the 200 through holes are designed, and the parameters are continuously corrected through sample testing to meet the vibration damping design performance requirements of the vibration damping body.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A floor vibration damping structure, characterized in that, include: A vibration damping body is provided with a plurality of through holes spaced apart along the extension direction of the floor, and each through hole has a first inner wall and a second inner wall that are arranged opposite to each other along the extension and contraction direction of the vibration damping body. The first inner wall and the second inner wall are in a separated state and an abutting state; In the separated state, the vibration damping body provides a first elastic force to the floor; In the contact state, the vibration damping body provides a second elastic force to the floor; Wherein, the second elastic force is greater than the first elastic force; Along the extension and retraction direction of the vibration damping body, the vibration damping body is provided with multiple rows of first through holes and at least one row of second through holes. Along the extension direction of the floor, the length of the second through hole is greater than the distance between two adjacent first through holes. The first inner wall and the second inner wall are arc surfaces that convex toward each other. The distance between the first inner wall and the second inner wall gradually decreases from both sides of the through hole toward the center of the through hole.

2. The floor vibration damping structure according to claim 1, characterized in that, Each row of first through holes and each row of second through holes are arranged along the extension direction of the floor. A row of second through holes is provided between each two adjacent rows of first through holes, and each second through hole is staggered from the two adjacent first through holes along the extension direction of the floor.

3. The floor vibration damping structure according to claim 1, characterized in that, The distance between the first inner wall and the second inner wall is less than the length of the through hole along the floor extension direction.

4. The floor vibration damping structure according to claim 1, characterized in that, The two sides of the through hole connecting the first inner wall and the second inner wall are curved surfaces.

5. The floor vibration damping structure according to any one of claims 1-4, characterized in that, The side surface of the vibration damping body is provided with an opening groove, and the axis of the opening groove is parallel to the axis of the through hole.

6. The floor vibration damping structure according to any one of claims 1-4, characterized in that, The vibration damping body has a first mounting seat at one end along its extension direction for connecting the interior floor, and a second mounting seat at the other end along its extension direction for connecting the vehicle floor.

7. A rail vehicle, characterized in that, It includes an interior floor and a vehicle body floor, wherein a floor vibration damping structure as described in any one of claims 1-6 is provided between the interior floor and the vehicle body floor.

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