A passenger car air spring bag skin buckling test device

Abstract

The utility model relates to a kind of passenger car air spring bag skin buckling test device, including the compression component and supporting component of opposite arrangement, and the compression component, supporting component are connected with the upper interface, lower interface of tension testing machine respectively;Compression component includes the compression working component for simulating buckling ring, supporting component includes the supporting working component for simulating the buckling piece, bag skin sample is located above supporting working component, tension testing machine controls compression working component to descend, to compress bag skin sample, the utility model can solve the lack of effective means in prior art to the actual contact stress of buckling process accurately measured, especially cannot realize the real-time monitoring to the evolution process of contact stress with time.

Description

Technical Field

[0001] This utility model belongs to the field of air spring technology, specifically relating to a passenger vehicle air spring bladder compression test device. Background Technology

[0002] With the development of the new energy vehicle industry and the localization of key components, air suspension is being used more and more widely in new energy vehicles. Unlike traditional suspension, air suspension uses air springs as elastic elements. By adjusting the pressure and volume of the compressed air inside, it can actively adjust the vehicle height and significantly improve the ride smoothness and ride comfort.

[0003] Air springs typically operate under high pressure environments ranging from 0.8 MPa to 1.0 MPa, and their sealing performance directly affects the reliability and safety of the system. To ensure long-term stable operation, all connection points of the air spring must possess excellent airtightness and tensile strength. The bladder, as a key pressure-bearing component of the air spring, is usually composed of a composite of rubber and reinforcing cord. Its upper and lower ends are sealed to metal components such as pistons or top seats through a crimping process. The crimping process generally uses a multi-lobed (e.g., 8-lobed or 12-lobed) crimping die to apply uniform radial pressure to the annular crimping component, causing it to undergo plastic shrinkage deformation. This creates an interference fit between the crimping ring, the bladder, and the crimped component, achieving sealing and axial locking. However, since the bladder is mainly composed of rubber, it exhibits significant viscoelasticity and stress relaxation characteristics. Under long-term compression, its internal stress gradually decreases over time, leading to a decrease in contact pressure in the crimping area and weakening the friction between the interfaces. When the frictional force decreases to an insufficient level to resist the axial pull-out force generated by the internal air pressure of the air spring, the bladder skin may experience slight slippage or loosening, ultimately leading to seal failure and gas leakage. Furthermore, because the crimping structure is annularly symmetrical and the crimping process relies on the coordinated action of multiple mold segments, it is difficult to accurately measure the contact stress within the crimping area, and especially difficult to achieve real-time monitoring of the evolution of contact stress over time. Utility Model Content

[0004] To address the shortcomings of existing technologies, a passenger vehicle air spring bladder buckling test device is proposed to solve the problem that existing technologies lack effective means to accurately measure the actual contact stress during the buckling process, and in particular, cannot achieve real-time monitoring of the evolution of contact stress over time.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A passenger vehicle air spring bladder buckling test device includes a compression assembly and a support assembly arranged opposite to each other, wherein the compression assembly and the support assembly are respectively connected to the upper interface and the lower interface of a tensile testing machine; The compression assembly includes a compression working part for simulating a buckling ring, the support assembly includes a support working part for simulating a buckled part, the bladder sample is located above the support working part, and the tensile testing machine controls the compression working part to move downward to compress the bladder sample.

[0006] This technical solution is further configured such that the compression working component is elongated, with its width being the same as the width of the contact surface between the clamping ring and the bladder skin, and its length being the circumference of the bladder skin. to .

[0007] The technical solution is further configured such that the compression assembly also includes a compression guide component, the cross-sectional shape of which is the same as the upper interface shape of the tensile testing machine, and the two are fitted with a clearance.

[0008] The technical solution is further configured such that a compression limiting hole is provided on the compression guide component, and a compression limiting pin is connected between the compression limiting hole and the upper connecting hole at the upper interface.

[0009] The technical solution is further configured such that one end of the compression guide component is connected to the compression working component, and a compression thread section is provided at the connection between the two, and a compression fixing nut adapted to its thread is provided on the compression thread section.

[0010] The technical solution is further configured such that the supporting working component is provided with a groove for placing the cystic membrane sample, and the bottom surface of the groove has raised texture; The width of the groove is the same as the width of the contact surface between the clamped part and the bladder skin, and the length of the groove is greater than the length of the compression working part.

[0011] The technical solution is further configured such that the groove has three sidewalls, and the sidewalls abut against the cystic membrane sample. The technical solution is further configured such that the support assembly also includes a support guide component, the structure of which is the same as that of the compression guide component.

[0012] The technical solution is further configured such that a support threaded section is provided at the junction of the support guide component and the support working component, and a support fixing nut adapted to its thread is provided on the support threaded section.

[0013] The beneficial effects of this utility model are: By designing compression and support components and connecting them to a tensile testing machine, it is possible to measure the change in contact stress of air spring skin in the crimping area of ​​passenger cars over time, thus solving the problem of difficulty in measuring the contact stress in the crimping area of ​​air spring skin in the prior art. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the passenger vehicle air spring bladder buckling test device in an embodiment of this utility model; Figure 2 This is an assembly diagram of the compression component and the support component in an embodiment of this utility model; Figure 3 This is a schematic diagram of the compression component in an embodiment of this utility model; Figure 4 This is a schematic diagram of the support assembly in an embodiment of this utility model.

[0015] In the attached diagram: 100, Compression assembly; 101, Compression working part; 102, Compression guide part; 103, Compression limiting pin; 104, Compression threaded section; 105, Compression fixing nut; 106, Compression limiting hole; 200, Support assembly; 201, Support working part; 202, Support guide part; 203, Support limiting pin; 204, Support threaded section; 205, Support fixing nut; 206, Support limiting hole; 207, Groove; 300, Tensile testing machine; 301, Upper interface; 302, Lower interface; 400, Bladder skin sample. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0017] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0018] According to an embodiment of this utility model, a passenger vehicle air spring bladder buckling test device is provided. Please refer to [link / reference]. Figures 1 to 4 It includes a compression component 100 and a support component 200 arranged opposite to each other, wherein the compression component 100 and the support component 200 are respectively connected to the upper interface 301 and the lower interface 302 of the tensile testing machine 300; The compression assembly 100 includes a compression working part 101 for simulating a buckling ring, the support assembly 200 includes a support working part 201 for simulating a buckled part, the bladder skin sample 400 is located above the support working part 201, and the tensile testing machine 300 controls the compression working part 101 to move downward to compress the bladder skin sample 400.

[0019] By adopting the above technical solution, a spring skin sample 400 is used to replace the entire spring skin for testing. A compression assembly 100 and a support assembly 200 are designed and connected to a tensile testing machine 300. The tensile testing machine 300 controls the compression working component 101 to move downward, so that the compression working component 101 compresses the spring skin sample 400 to the target compression amount (the target compression amount is the compression amount set by the operator). Keeping the compression amount constant, the compression load is recorded by the sensor built into the tensile testing machine, and the timing is synchronized. The relationship between the compression load and time can then be obtained. The compression load is then converted into contact stress, which can equivalently measure the change of contact stress of the air spring spring skin in the crimping area over time, solving the problem of difficulty in measuring the contact stress of the air spring spring skin in the crimping area in the prior art.

[0020] Here, the conversion formula between compressive load and contact stress is as follows: ,in For contact stress, For compressive load, The area of ​​the compressed region of the cystic tissue sample 400.

[0021] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The compression working component 101 is configured as a long strip, the width of which is the same as the width of the contact surface between the clamping ring and the bladder skin, and the length of which is the circumference of the bladder skin. to .

[0022] By adopting the above technical solution, the design of the compression working component 101 enables it to accurately simulate the pressure distribution of the actual clamping ring on the bladder skin, ensuring the accuracy and reliability of the test results.

[0023] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The compression assembly 100 further includes a compression guide component 102, the cross-sectional shape of which is the same as that of the upper interface 301 of the tensile testing machine, and the two are fitted with a clearance fit. This design allows the compression assembly 100 to be stably mounted on the tensile testing machine 300, avoiding displacement or shaking during the test and improving test accuracy.

[0024] Optionally, the upper interface 301 is designed to be circular, and the corresponding compression guide component 102 is designed to be cylindrical, which is embedded inside the upper interface 301, that is, the two are fitted with a clearance to ensure that the concentricity of the compression component 100 and the upper interface 301 of the tensile testing machine meets the requirements.

[0025] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The compression guide component 102 is provided with a compression limiting hole 106, and a compression limiting pin 103 is connected between the compression limiting hole 106 and the upper connecting hole at the upper interface 301.

[0026] By adopting the above technical solution, the setting of the compression limit pin 103 can prevent the compression guide component 102 from rotating or displacing during the test, ensuring that the compression working component 101 always stays in the correct position and applies uniform pressure to the bladder sample 400.

[0027] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 One end of the compression guide component 102 is connected to the compression working component 101, and a compression thread section 104 is provided at the connection between the two. A compression fixing nut 105 adapted to its thread is provided on the compression thread section 104.

[0028] During assembly, the compression limiting pin 103 passes sequentially through the upper connecting hole and the compression limiting hole 106 to restrict the axial movement of the compression assembly 100. Then, the compression fixing nut 105 is rotated until its end face abuts against the edge of the upper interface 301. By applying sufficient tightening torque, the compression fixing nut 105 locks the compression assembly 100 onto the tensile testing machine 300, eliminating any possible risk of slippage. By loosening and tightening the compression fixing nut 105, the entire compression assembly 100 can be quickly installed onto or removed from the tensile testing machine 300. This is very convenient for replacing compression assemblies 100 of different specifications to meet the testing needs of different models of air spring bladders.

[0029] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The supporting working component 201 is provided with a groove 207 for placing the bladder skin sample 400. The bottom surface of the groove 207 has raised patterns. The raised patterns are designed to simulate the shape of components such as the piston and top seat of the air spring assembly (the clamped parts) in the clamping area, thereby more accurately simulating the stress state of the bladder skin in the clamping area. By changing the raised pattern structure, the influence of different raised patterns on the clamping performance can be verified.

[0030] The width of the groove 207 is the same as the width of the contact surface between the clamped part and the bladder skin, and the length of the groove 207 is greater than the length of the compression working component 101. This size design ensures that the bladder skin sample 400 can be completely placed within the groove 207, and that the compression working component 101 can completely cover the test area of ​​the bladder skin sample 400.

[0031] Optionally, the length difference between the groove 207 and the compression working part 101 is 0.2 mm.

[0032] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The groove 207 has three sidewalls that abut against the cystic membrane sample 400. The design of the three sidewalls forms a U-shaped structure, which can effectively prevent the cystic membrane sample 400 from being excessively deformed during testing, more realistically simulating the snapping state of the cystic membrane, and also making it easier for operators to place and remove the cystic membrane sample 400, thus improving testing efficiency. Optionally, the depth of the groove 207 is slightly greater than the thickness of the bladder skin sample 400, and the length of the bladder skin sample 400 is less than the length of the compression working part 101, with the length difference between the two preferably being 0.1 mm.

[0033] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The support assembly 200 further includes a support guide component 202, the structure of which is the same as that of the compression guide component 102.

[0034] Specifically, the cross-sectional shape of the support guide component 202 is the same as that of the lower interface 302 of the tensile testing machine, and the two are clearance-fitted. This design allows the support assembly 200 to be stably installed on the tensile testing machine 300, avoiding displacement or shaking during testing and improving testing accuracy. Optionally, the lower interface 302 is designed to be circular, and correspondingly, the support guide component 202 is designed to be cylindrical, embedded inside the lower interface 302, i.e., clearance-fitted, ensuring that the concentricity of the support assembly 200 and the lower interface 302 meets the requirements. The support guide component 202 is provided with a support limiting hole 206, and a support limiting pin 203 connects the support limiting hole 206 and the lower connecting hole at the lower interface 302. The support limiting pin 203 can prevent the support guide component 202 from rotating or displacing during testing.

[0035] In this embodiment of a passenger vehicle air spring bladder buckling test device, please refer to... Figures 1 to 4 The support guide component 202 and the support working component 201 are provided with a support thread section 204, and a support fixing nut 205 adapted to its thread is provided on the support thread section 204.

[0036] During assembly, the support limiting pin 203 passes sequentially through the lower connecting hole and the support limiting hole 206, restricting the axial movement of the support assembly 200. Then, the support fixing nut 205 is rotated until its end face abuts against the edge of the lower interface 302. By applying sufficient tightening torque, the support fixing nut 205 locks the support assembly 200 onto the tensile testing machine 300, eliminating any possible risk of slippage. By loosening and tightening the support fixing nut 205, the entire support assembly 200 can be quickly installed onto or removed from the tensile testing machine 300. This is very convenient for replacing support assemblies 200 of different specifications to meet the testing requirements of different models of air spring bladders.

[0037] During the test, the air spring sheet sample 400 is placed in the groove 207 of the supporting working component 201. The tensile testing machine 300 is started, and the compression working component 101 is controlled to move downward to compress the air spring sheet sample 400, simulating the actual crimping process. Keeping the compression constant, the sensor of the tensile testing machine 300 records the relationship between the compression load and time. The compression load is then converted into contact stress, which can equivalently measure the change in contact stress of the air spring sheet in the crimping area over time. This testing device has a simple structure and is easy to operate. It can accurately simulate the crimping process of air spring sheets, providing reliable test data for the design and quality control of air springs in passenger vehicles.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0040] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0041] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0042] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A passenger vehicle air spring bladder buckling test device, characterized in that, It includes a compression component and a support component arranged opposite to each other, wherein the compression component and the support component are respectively connected to the upper interface and the lower interface of the tensile testing machine; The compression assembly includes a compression working part for simulating a buckling ring, the support assembly includes a support working part for simulating a buckled part, the bladder sample is located above the support working part, and the tensile testing machine controls the compression working part to move downward to compress the bladder sample.

2. The passenger vehicle air spring bag skin compression test device of claim 1, wherein, The compression working component is configured as a long strip, the width of which is the same as the width of the contact surface between the clamping ring and the bladder skin, and the length of which is the circumference of the bladder skin. to .

3. The passenger vehicle air spring bag skin compression test device of claim 1, wherein, The compression assembly also includes a compression guide component, the cross-sectional shape of which is the same as the upper interface shape of the tensile testing machine, and the two are fitted with a clearance.

4. The passenger vehicle air spring bag skin compression test device of claim 3, wherein, The compression guide component is provided with a compression limiting hole, and a compression limiting pin is connected between the compression limiting hole and the upper connecting hole at the upper interface.

5. The passenger vehicle air spring bag skin compression testing apparatus of claim 3 or 4, wherein, One end of the compression guide component is connected to the compression working component, and a compression thread section is provided at the connection between the two. A compression fixing nut adapted to the thread is provided on the compression thread section.

6. The passenger vehicle air spring bag skin compression testing apparatus of claim 1, wherein, The supporting working component is provided with a groove for placing the cystic membrane sample, and the bottom surface of the groove has raised texture; The width of the groove is the same as the width of the contact surface between the clamped part and the bladder skin, and the length of the groove is greater than the length of the compression working part.

7. The passenger vehicle air spring bladder compression test device according to claim 6, characterized in that, The groove has three sidewalls that abut against the cystic membrane sample.

8. The passenger vehicle air spring bladder buckling test device according to claim 3 or 4, characterized in that, The support assembly further includes a support guide component, the structure of which is the same as that of the compression guide component.

9. The passenger vehicle air spring bag skin compression testing apparatus of claim 8, wherein, A support thread section is provided at the junction of the support guide component and the support working component, and a support fixing nut adapted to its thread is provided on the support thread section.

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