A magnetorheological air spring device for vehicles

Abstract

The present invention relates to a magnetorheological air spring device for train vehicles, comprising an upper cover plate, a lower cover plate, a rubber bladder, a coil, a laminated magnetorheological elastomer rubber stack assembly, an additional air chamber, a gas pipeline, and a coil power supply control module. The upper cover plate, the rubber bladder, and the lower cover plate are sequentially connected to form an air spring cavity. The laminated magnetorheological elastomer rubber stack assembly includes a connected magnetorheological elastomer and a rubber stack, the rubber stack being fixed to the lower cover plate, and a set gap being left between the magnetorheological elastomer and the upper cover plate when the vehicle is unloaded. The coil is fixed to the upper cover plate within the air spring cavity and connected to the coil power supply control module. The air spring cavity and the additional air chamber are connected via a pipeline. Compared with the prior art, the present invention can meet the high equivalent stiffness requirements of air springs in railway locomotives and vehicles, and has the advantages of less vertical space restrictions and convenient installation.

Description

Technical Field

[0001] The present invention relates to the field of rail vehicle vibration reduction equipment, and in particular to a magnetorheological air spring device for a vehicle. Background Art

[0002] Train electromechanical braking is a new braking method that uses electricity to directly drive friction between brake shoes and brake discs. This simplifies the existing electro-pneumatic braking system, reduces energy loss and failure rates, and achieves full electrification of the braking system. This braking method also requires the electrification of other pneumatic components on the train to improve train operating efficiency and safety. As a key pneumatic component connecting the car body and bogie, the air spring unit adjusts vertical and horizontal stiffness through inflation and deflation to achieve vertical, horizontal, and torsional deformation between the car body and bogie, thereby ensuring the stability, comfort, and safety of the locomotive.

[0003] Magnetorheological elastomers are intelligent materials with variable stiffness characteristics that work in the pre-yield region of the material. They can automatically change their mechanical properties under the action of an external magnetic field. They are currently used in multi-layer intelligent vibration reduction devices such as vibration isolators.

[0004] After searching, Chinese invention patent application CN102606664A discloses an adaptive spring structure based on magnetorheological technology, which mainly realizes adaptive stiffness adjustment through magnetorheological elastomer rubber airbag, built-in magnetorheological elastic liquid coil, and piston structure.

[0005] However, the air spring of the above design has the following defects:

[0006] 1) The equivalent stiffness of the air spring structure can only meet the requirements of traditional road vehicles and is difficult to meet the high stiffness requirements of railway locomotives;

[0007] 2) Railway rolling stock requires magnetorheological elastomer air springs to achieve high equivalent stiffness within a very limited vertical space, while the vertical space required by the above-mentioned air spring structure is too large;

[0008] 3) The magnetorheological fluid / magnetorheological elastomer air springs of automobile vehicles do not have a rigid structure connected to the upper cover plate and cannot provide the appropriate horizontal stiffness requirements of railway locomotives. Summary of the Invention

[0009] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a magnetorheological air spring device for vehicles, which can meet the high equivalent stiffness requirements of air springs in railway locomotives and vehicles and has little vertical space restriction; in addition, the present invention can directly replace the existing air springs without making major changes to the bogie structure of railway locomotives and vehicles, and is more convenient to install.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] The present invention provides a magnetorheological air spring device for train vehicles, comprising an upper cover plate, a lower cover plate, a rubber bag, a coil, a laminated magnetorheological elastomer rubber stack assembly, an additional air chamber, a gas pipeline, and a coil power supply control module;

[0012] The upper cover plate, the rubber bag and the lower cover plate are connected in sequence to form an air spring cavity;

[0013] The laminated magnetorheological elastomer rubber stack assembly is fixed in the air spring cavity, and the laminated magnetorheological elastomer rubber stack assembly includes a connected magnetorheological elastomer and a rubber stack. The rubber stack is fixed to the lower cover plate, and when the locomotive vehicle is in an unloaded condition, a set gap is left between the magnetorheological elastomer and the upper cover plate. The coil is fixed to the upper cover plate in the air spring cavity, and the axial distance between the coil and the laminated magnetorheological elastomer rubber stack assembly is such that the coil does not contact the laminated magnetorheological elastomer rubber stack assembly under maximum horizontal shear deformation. The coil is connected to the coil power supply control module.

[0014] The air spring cavity is connected to the additional air chamber through a pipeline.

[0015] Preferably, the magnetorheological elastomer comprises a plurality of magnetorheological elastomer sheets and silicon steel sheets that are alternately bonded and connected.

[0016] Preferably, the set gap is 20 mm to 40 mm.

[0017] Preferably, the bottom of the rubber pile is fixed to the lower cover plate by profile connection or bolts.

[0018] Preferably, the magnetorheological elastomer and the rubber pile are bonded together.

[0019] Preferably, a height sensor and an acceleration sensor are provided on the upper cover plate.

[0020] Preferably, the lower cover plate is fixed to the locomotive vehicle suspension through a guide positioning interface.

[0021] Preferably, a throttle hole is provided on the pipeline.

[0022] Preferably, an air inlet and an electrical circuit for supplying power to the coil are provided on the lower cover plate.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1) The equivalent stiffness of the laminated magnetorheological elastomer designed in the present invention can meet the high stiffness requirements of railway locomotives, realize vertical, horizontal and torsional deformation between the car body and the bogie, and provide appropriate stiffness and damping characteristics to ensure the stability, comfort and safety of the locomotive.

[0025] 2) The present invention adopts a structure in which magnetorheological elastomer material and silicon steel sheets are stacked inside the air spring for train vehicles, which can meet the high equivalent stiffness requirements of the air spring under a relatively small height restriction.

[0026] 3) The stacking of the magnetorheological elastomer material and the silicon steel sheet of the present invention can reduce the eddy current heating effect caused by the excitation of the magnetorheological elastomer magnetic coil, and has the advantages of simple structure, easy manufacturing and low price.

[0027] 4) The present invention can directly replace existing air springs without making major changes to the railway vehicle bogie structure, and the designed magnetorheological air spring device has a small number of components, a simple overall structure, and is easy to install.

[0028] 5) The present invention provides a height sensor and an acceleration sensor on the upper cover plate of the air spring, which can cooperate with the power supply control module to achieve more accurate equivalent stiffness control. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of a magnetorheological air spring device for a train vehicle according to the present invention;

[0030] Figure 2 Schematic diagram of the magnetic circuit structure of the laminated magnetorheological elastomer;

[0031] Figure 3 Schematic diagram of the internal composition of the laminated magnetorheological elastomer;

[0032] Figure 4 Schematic diagram of the structure of a magnetorheological air spring device for train vehicles under full load;

[0033] Reference numerals: 1-upper cover, 2-coil, 3-rubber pile, 4-lower cover, 5-laminated magnetorheological elastomer, 51-magnetorheological elastomer sheet, 52-silicon steel sheet, 6-pipeline, 7-additional air chamber, 8-rubber bladder. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0035] Example

[0036] In response to the requirement that the magnetorheological elastomer air spring for railway train vehicles achieves a high equivalent stiffness (350N / mm) in a very limited vertical space (no more than 300mm), this embodiment provides a magnetorheological air spring device for train vehicles, including an upper cover plate 1, a lower cover plate 4, a rubber bag 8, a coil 2, a laminated magnetorheological elastomer rubber pile assembly, an additional air chamber 7, a gas pipeline 6 with a throttle hole, a coil power supply control module and electrical equipment; the upper cover plate 1, the rubber bag 8 and the lower cover plate 4 are connected in sequence to form an air spring cavity; the laminated magnetorheological elastomer rubber pile assembly is fixed in the air spring cavity, and the laminated magnetorheological elastomer rubber pile assembly is fixed in the air spring cavity. The rheological elastomer rubber stack assembly includes a laminated magnetorheological elastomer 5 and a rubber stack 3 that are bonded together. The rubber stack 3 is fixed on the lower cover plate 4, and when the locomotive vehicle is in an unloaded condition, a set gap is left between the laminated magnetorheological elastomer 5 and the upper cover plate 1; the coil 2 is fixed on the upper cover plate 1 in the air spring cavity, and its axial distance from the laminated magnetorheological elastomer rubber stack assembly is sufficient to prevent it from contacting the laminated magnetorheological elastomer rubber stack assembly under maximum horizontal shear deformation; the coil 2 is connected to electrical equipment; an air inlet and an electrical circuit for supplying power to the coil 2 are provided on the lower cover plate 4; the air spring cavity and the additional air chamber 7 are connected through a pipeline 6.

[0037] like Figure 3 As shown, the laminated magnetorheological elastomer 5 includes a plurality of alternately connected magnetorheological elastomer sheets 51 and silicon steel sheets 52. In this embodiment, the magnetorheological elastomer sheets 51 and the silicon steel sheets 52 are glued together, and the silicon steel sheets 52 can also be replaced with other similar materials as appropriate. Figure 2 Schematic diagram of the magnetic circuit structure of the laminated magnetorheological elastomer.

[0038] As another preferred embodiment, the gap between the laminated magnetorheological elastomer 5 and the upper cover plate 1 ranges from 20 mm to 40 mm.

[0039] In this embodiment, the bottom of the rubber pile 3 can be fixed to the lower cover plate 4 by profile connection or bolts, which has high stability and is more convenient to install.

[0040] The upper cover plate 1 is provided with a height sensor and an acceleration sensor, which can cooperate with the power supply control module to achieve more accurate equivalent stiffness control. The lower cover plate 4 is fixed to the locomotive vehicle suspension through a guide positioning interface.

[0041] Next, the working principle of the air spring device in this embodiment is introduced in detail.

[0042] Considering the vertical pressure exerted on the magnetorheological elastomer air spring structure during no-load, rated load, and full-load conditions, as the mass on the spring increases, the upper cover plate 1 contacts the top of the laminated magnetorheological elastomer 5. After contact, in order to maintain the deformation of the laminated magnetorheological elastomer 5 in accordance with the working height of the air spring, that is, to maintain the locomotive vehicle floor surface within a certain height range, the magnetorheological effect is stimulated by energizing the coil, thereby changing the stiffness of the laminated magnetorheological elastomer 5, thereby ensuring that the deformation and stiffness of the variable stiffness magnetorheological elastomer air spring under the current load can maintain the locomotive vehicle floor surface within a certain height range.

[0043] Variable stiffness magnetorheological elastomer air springs can adaptively adjust vertical stiffness according to different working conditions, meeting the performance requirements of locomotives under no-load and fully loaded conditions, and have high application value and development potential.

[0044] Under AW0 working condition, the air spring is in an over-inflated state, and the initial internal pressure is set to: Where F is the load of the air spring under AW0 working condition (N), A is the equivalent area of ​​the air spring (mm), p0 is the atmospheric pressure (Bar), V0 is the volume of the gas in the air spring (L), V a It is the additional air chamber volume (L), and its floor surface is higher than the platform surface by Δz = 10 ~ 20 mm.

[0045] As the load increases, the equivalent stiffness of the gas in the air spring is: Among them, ν gas polytropic index, p z0 V is the internal pressure of the gas in the air spring when the load increases. z0 is the overall height of the air spring at this time, and is compressed until the upper cover plate 1 contacts the upper surface of the laminated magnetorheological elastomer 5 .

[0046] The load of the current variable stiffness magnetorheological elastomer air spring is calculated by the height sensor and acceleration sensor installed on the upper cover 1, and the equivalent stiffness of the current laminated magnetorheological elastomer is obtained according to the strain of the laminated magnetorheological elastomer 5 of the variable stiffness magnetorheological elastomer air spring at this time, satisfying F=(k air +k MRE )Δx, where k air 、k MRE , Δx are the equivalent stiffness of the air spring, the stiffness of the magnetorheological elastomer of the air spring, and the deformation of the magnetorheological elastomer, respectively.

[0047] Coil 2 is energized to generate a magnetic field that causes the equivalent stiffness of the laminated MR elastomer 5 at the measured strain value to meet the calculated equivalent stiffness. This increase in the equivalent stiffness of the laminated MR elastomer 5 maintains the constant operating height of the variable stiffness MR elastomer air spring, thereby maintaining the relative height between the vehicle floor and the platform.

[0048] When the air spring is unloaded (40KN), the stiffness is 215N / mm. When the magnetorheological air spring is fully loaded (140KN), the equivalent stiffness can reach a maximum of 350N / mm as the load increases.

[0049] In this embodiment, the parameters of the magnetorheological elastomer sheets 51 and the silicon steel sheets 52 are adjusted based on the actual needs of the railway locomotive. For example, the parameters can be set as follows: the diameter of the magnetorheological elastomer sheets 51 is 100 mm, the thickness is 2 mm, and there are 10 layers; the diameter of the silicon steel sheets 52 is 100 mm, the thickness is 1 mm, and there are 10 layers. In addition, the number of magnetorheological elastomer sheets 51 and the number of silicon steel sheets 52 are set to 10 and 9, respectively.

[0050] It should be noted that the air gap between the coil 2 and the laminated magnetorheological elastomer 5 should not exceed 5 mm.

[0051] Generally speaking, the overall height of the air spring structure of a railway locomotive is not greater than 300 mm; the upper cover plate 1 and the lower cover plate 4 are both cylindrical cover plates, and the outer diameter is generally not greater than 640 mm.

[0052] It should be noted that, in this article, the equivalent stiffness of the laminated magnetorheological elastomer 5 does not necessarily have to be positive stiffness, and can also be negative stiffness according to the equivalent stiffness result. The result does not affect the specific implementation of the present invention.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A magnetorheological air spring device for train vehicles, characterized in that: It comprises an upper cover plate (1), a lower cover plate (4), a rubber bag (8), a coil (2), a laminated magnetorheological elastomer rubber pile assembly, an additional air chamber (7), a gas pipeline (6), and a coil power supply control module; The upper cover plate (1), the rubber bag (8) and the lower cover plate (4) are sequentially connected to form an air spring cavity; The laminated magnetorheological elastomer rubber pile assembly is fixed in the air spring cavity, and the laminated magnetorheological elastomer rubber pile assembly includes a connected laminated magnetorheological elastomer (5) and a rubber pile (3), the rubber pile (3) is fixed on the lower cover plate (4), and when the locomotive vehicle is in an unloaded working condition, a set gap is left between the laminated magnetorheological elastomer (5) and the upper cover plate (1); the coil (2) is fixed on the upper cover plate (1) in the air spring cavity, and the axial distance between the coil (2) and the laminated magnetorheological elastomer rubber pile assembly satisfies that the coil (2) does not contact the laminated magnetorheological elastomer rubber pile assembly under the condition of maximum horizontal shear deformation; the coil (2) is connected to the coil power supply control module; The air spring cavity is connected to the additional air chamber (7) via a pipeline (6); The laminated magnetorheological elastomer (5) comprises a plurality of alternately connected magnetorheological elastomer sheets (51) and silicon steel sheets (52); The magnetorheological elastomer sheet (51) and the silicon steel sheet (52) are bonded and connected; The laminated magnetorheological elastomer (5) and the rubber pile (3) are bonded together; The set gap is 20 mm to 40 mm.

2. The magnetorheological air spring device for train vehicles according to claim 1, characterized in that: The bottom of the rubber pile (3) is fixed to the lower cover plate (4) through profile connection or bolts.

3. The magnetorheological air spring device for train vehicles according to claim 1, characterized in that: The upper cover plate (1) is provided with a height sensor and an acceleration sensor.

4. The magnetorheological air spring device for train vehicles according to claim 1, characterized in that: The lower cover plate (4) is fixed on the locomotive vehicle suspension via a provided guide positioning interface.

5. The magnetorheological air spring device for train vehicles according to claim 1, characterized in that: A throttle hole is provided on the pipeline (6).

6. The magnetorheological air spring device for train vehicles according to claim 1, characterized in that: An air inlet and an electrical circuit for controlling power supply to the coil (2) are provided on the lower cover plate (4).

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