A tooling for suspension system fatigue testing

Abstract

The utility model relates to a kind of tool for suspension system fatigue test, including rolling track and support sleeve, the shaft body end of measured suspension system is embedded inside support sleeve, and bearing assembly is arranged between the two, rolling track is placed above test equipment, support sleeve is slidably connected with rolling track, the utility model can solve the comprehensive test of the whole suspension system insufficient to support prior art, resulting in the need for outsourcing test, there is the problem such as high test cost, long development cycle, uncontrollable factors from outside influence, while the technical problem that existing test equipment is difficult to guarantee test precision and safety.

Description

Technical Field

[0001] This utility model belongs to the field of suspension system fatigue testing technology, specifically relating to a tooling for suspension system fatigue testing. Background Technology

[0002] The suspension system is a crucial component of a vehicle, and its performance directly impacts the vehicle's driving stability, comfort, and safety. To ensure the reliability and durability of the suspension system, comprehensive testing and evaluation are necessary. Currently, suspension system fatigue testing is primarily conducted using specialized testing equipment, which typically simulates the suspension system's motion and stress conditions under real-world operating conditions.

[0003] Most existing testing equipment is designed for specific components and cannot meet the comprehensive testing needs for leaf spring fatigue, shaft fatigue, welding table fatigue, etc., making it unsuitable for comprehensive fatigue testing of suspension systems. Companies typically need to purchase dedicated suspension system testing equipment or outsource testing to external organizations, which not only leads to high testing costs but also extends product development cycles. Furthermore, outsourced testing is susceptible to uncontrollable external factors, increasing the uncertainty of test results. In addition, existing testing equipment struggles to simultaneously guarantee testing accuracy and safety, especially when simulating the actual working conditions of suspension systems. It often fails to accurately reflect the stress and motion characteristics at the shaft ends of the suspension system, resulting in discrepancies between test results and actual usage conditions. Utility Model Content

[0004] To address the shortcomings of existing technologies, a new fixture for fatigue testing of suspension systems is proposed. This fixture aims to solve the problems that existing technologies are insufficient to support comprehensive testing of the entire suspension system, leading to the need for outsourcing testing, high testing costs, long development cycles, and susceptibility to uncontrollable external factors. In addition, existing testing equipment has the technical problem of failing to guarantee testing accuracy and safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fixture for fatigue testing of a suspension system includes a rolling track and a support sleeve. The shaft end of the suspension system under test is embedded inside the support sleeve, and a bearing assembly is provided between the two. The rolling track is placed above the testing equipment, and the support sleeve is slidably connected to the rolling track.

[0007] The technical solution is further configured such that a tapered ring is fitted onto the end of the shaft of the suspension system under test, the bearing assembly is disposed inside the support sleeve, the bearing assembly includes two tapered roller bearings, and the tapered ring is embedded in the inner ring of the adjacent tapered roller bearing.

[0008] The technical solution is further configured such that a locking nut is threadedly connected to the end of the shaft of the suspension system under test, the locking nut is located outside the support sleeve, and a first washer is provided between the two.

[0009] The technical solution is further configured such that the locking nut is provided with a locking bolt threadedly connected to it, and the end of the locking bolt abuts against the first washer.

[0010] The technical solution is further configured such that an annular groove is provided on the side of the locking nut away from the support sleeve, and a second washer that engages with the locking bolt is provided inside the annular groove.

[0011] The technical solution is further configured such that the support sleeve is disposed on the support plate, the support plate is provided with a support roller rotatably connected thereto, and the rolling track is provided with a track groove that matches the wheel surface shape of the support roller.

[0012] The technical solution is further configured such that there are two supporting rollers, and the two supporting rollers and the supporting sleeve form a triangular structure.

[0013] The beneficial effects of this utility model are:

[0014] 1. By using the tooling for suspension system fatigue testing, the autonomy of suspension system fatigue testing is realized, no longer affected by uncontrollable external factors, accelerating project development progress, reducing time costs, saving outsourcing testing costs, avoiding various uncertainties brought about by outsourcing testing, and improving testing efficiency.

[0015] 2. The reasonable structure increases the utilization rate of the testing equipment and diversifies the test products. Through the reasonable combination of support sleeves, support plates and support rollers, the tooling can adapt to the testing needs of different types of suspension systems.

[0016] 3. The design of the support sleeve and the rolling track, or the design of the support roller and the rolling track, helps to control the movement of the suspension system under test in a limited space, making the movement trajectory more stable and controllable during the test, and improving the reliability of the test data.

[0017] 4. Locking is achieved by tightening nuts and bolts, which reduces safety risks and avoids potential safety hazards such as loosening or falling off of parts during the testing process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one embodiment of the tooling used for fatigue testing of suspension systems in this utility model.

[0019] Figure 2This is an assembly diagram of the support plate, support sleeve, and support rollers in an embodiment of this utility model;

[0020] Figure 3 This is a disassembly diagram of the support sleeve and bearing assembly in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of another embodiment of the tooling used for fatigue testing of suspension systems in this utility model.

[0022] In the attached diagram: 1. Rolling track; 2. Support plate; 3. Support sleeve; 4. Suspension system under test; 5. Support roller; 6. Track groove; 7. Tapered ring; 8. First tapered roller bearing; 9. Second tapered roller bearing; 10. Locking nut; 11. First washer; 12. Second washer; 13. Locking bolt. Detailed Implementation

[0023] 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.

[0024] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0025] According to an embodiment of this utility model, a fixture for fatigue testing of suspension systems is provided. Please refer to [link / reference]. Figures 3 to 4 The test includes a rolling track 1 and a support sleeve 3. The shaft end of the suspension system 4 under test is embedded inside the support sleeve 3, and a bearing assembly is provided between the two. The rolling track 1 is placed above the test equipment, and the support sleeve 3 is slidably connected to the rolling track 1.

[0026] Specifically, the rolling track 1 is made of high-strength alloy steel, possessing sufficient rigidity and wear resistance to withstand repeated loads generated during long-term fatigue testing. The length of the rolling track 1 is set according to the testing requirements, and its upper surface is precision-machined to ensure the stability of the support plate 2 when sliding on it.

[0027] Specifically, the shaft end of the suspension system 4 under test is embedded inside the support sleeve 3, and a bearing assembly is provided between the shaft end and the support sleeve 3. The bearing assembly ensures that the shaft can rotate freely during the test, reducing friction and improving test accuracy. The bearing assembly uses standard bearings, and the model is selected according to the shaft diameter.

[0028] During use, the end of the shaft of the suspension system 4 under test is embedded inside the support sleeve 3, and relative rotation between the shaft and the support sleeve 3 is achieved through a bearing assembly. The support sleeve 3 is connected to the rolling track 1 via a sliding connection and can slide freely on the rolling track 1. When fatigue testing of the suspension system 4 is performed, an external drive device causes the support sleeve 3 to reciprocate on the rolling track 1, thereby simulating the working state of the suspension system during actual use and testing its fatigue performance and durability. This achieves autonomy in the fatigue testing of the suspension system, eliminating the influence of uncontrollable external factors, accelerating project development, reducing time costs, saving on outsourced testing costs, avoiding various uncertainties brought about by outsourced testing, and improving testing efficiency.

[0029] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 3 to 4 The shaft end of the suspension system 4 under test is fitted with a tapered ring 7, and the bearing assembly is located inside the support sleeve 3. The bearing assembly includes two tapered roller bearings, and the tapered ring 7 is embedded in the inner ring of the adjacent tapered roller bearing.

[0030] Specifically, the tapered ring 7 is made of 40Cr steel, and after quenching and tempering, its hardness reaches HRC35-40. Its inner diameter matches the outer diameter of the shaft end, and the taper angle is 15° to 20°. The tapered ring 7 is fitted onto the shaft end with an interference fit, ensuring no relative movement between them. This evenly distributes the load on the shaft end to the tapered roller bearing, avoiding localized stress concentration and extending the bearing's service life.

[0031] Specifically, the bearing assembly includes a first tapered roller bearing 8 and a second tapered roller bearing 9, the models of which are selected according to the shaft diameter. The first tapered roller bearing 8 and the second tapered roller bearing 9 are installed back-to-back, meaning the large ends of the two bearings face each other and the small ends face outwards. This installation method can simultaneously withstand radial and axial loads, improving the stability and accuracy of the testing system. The inner diameters of the first tapered roller bearing 8 and the second tapered roller bearing 9 match the outer diameter of the shaft end, and their outer diameters match the inner diameter of the support sleeve 3. A tapered ring 7 is embedded in the inner ring of the first tapered roller bearing 8, and the tapered surface of the tapered ring 7 matches the tapered surface of the inner ring of the first tapered roller bearing 8, forming a tight contact between them to ensure a stable and reliable connection between the shaft end and the bearing.

[0032] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 3 to 4 The shaft end of the suspension system 4 under test is provided with a locking nut 10 that is threadedly connected to it. The locking nut 10 is located outside the support sleeve 3, and a first washer 11 is provided between the two.

[0033] Specifically, the end of the shaft is provided with an external thread, the thread specification of which is determined according to the diameter of the shaft. The locking nut 10 is made of 40Cr steel, and after quenching and tempering, its hardness reaches HRC35-40. Its inner diameter matches the external thread at the end of the shaft. The inner surface of the locking nut 10 is machined with an internal thread that matches the external thread at the end of the shaft, and it is connected to the end of the shaft by a threaded connection.

[0034] Specifically, a first washer 11 is provided between the locking nut 10 and the support sleeve 3. The first washer is made of 65Mn spring steel and has a hardness of HRC45-50 after heat treatment. Its inner diameter matches the outer diameter of the shaft end, and its outer diameter is similar to the outer diameter of the locking nut 10. The function of the first washer 11 is to prevent the locking nut 10 from directly contacting the support sleeve 3, avoiding friction and wear between them, and also to provide cushioning and sealing.

[0035] During installation, first, the shaft end is passed through the support sleeve 3 and the bearing assembly. Then, a first washer 11 is placed between the shaft end and the support sleeve 3. Finally, the lock nut 10 is screwed onto the external thread of the shaft end and tightened to the appropriate torque. The function of the lock nut 10 is to fix the relative position between the shaft end and the support sleeve 3, prevent axial movement of the shaft during testing, and ensure the stability and accuracy of the test.

[0036] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 3 to 4 The locking nut 10 is provided with a locking bolt 13 that is threadedly connected to it, and the end of the locking bolt 13 abuts against the first washer 11.

[0037] Specifically, the locking nut 10 has two to four radial through holes on its side, evenly distributed around its circumference. Each through hole has an internal thread. The locking bolt 13 is made of 45# steel, and after heat treatment, its hardness reaches HRC35-40. Its outer diameter matches the internal thread of the through hole on the locking nut 10. The outer surface of the locking bolt 13 is machined with an external thread that matches the internal thread of the through hole in the locking nut 10, and it is connected to the locking nut 10 via a threaded connection.

[0038] Specifically, the end of the locking bolt 13 is either flat or spherical and abuts against the first washer 11. The function of the locking bolt 13 is to prevent the locking nut 10 from loosening due to vibration during the test, and to ensure a stable and reliable connection between the shaft end and the support sleeve 3.

[0039] During installation, first screw the locking nut 10 onto the external thread at the end of the shaft and tighten it to the appropriate torque. Then screw the locking bolt 13 into the through hole on the locking nut 10 until the end of the locking bolt 13 abuts against the first washer 11. This can effectively prevent the locking nut 10 from loosening during the test and improve the reliability and safety of the test system.

[0040] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 3 to 4 The locking nut 10 has an annular groove on the side away from the support sleeve 3, and a second washer 12 that engages with the locking bolt 13 is provided inside the annular groove.

[0041] Specifically, the annular groove is made by turning and its function is to accommodate the second gasket 12 and provide engagement space for the locking bolt 13.

[0042] Specifically, the second washer 12 is made of 65Mn spring steel, and after heat treatment, its hardness reaches HRC45-50. Its inner diameter matches the outer diameter of the shaft end, and its outer diameter is similar to the outer diameter of the annular groove. The second washer 12 is annular in shape, but it has a notch or groove at the position corresponding to the locking bolt 13 to engage with the locking bolt 13, forming a mechanical lock. This engaging structure effectively prevents the locking nut 10 from loosening due to vibration during testing, improving the reliability and safety of the testing system.

[0043] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 1 to 3 The support sleeve 3 is disposed on the support plate 2, and the support plate 2 is provided with a support roller 5 rotatably connected thereto. The rolling track 1 is provided with a track groove 6 that matches the wheel surface shape of the support roller 5.

[0044] Specifically, the support plate 2 is made of aluminum alloy, which has high strength and light weight, making it easy to install and adjust. The area of ​​the support plate 2 is determined according to the size of the suspension system 4 under test. A support sleeve 3 is provided on the support plate 2. The support sleeve 3 is made of 45 steel and has a hardness of HRC40-45 after heat treatment. The inner diameter of the support sleeve 3 is determined according to the diameter of the end of the shaft of the suspension system under test.

[0045] Specifically, the support roller 5 is made of bearing steel, and its hardness reaches HRC58-62 after heat treatment. The support roller 5 is rotatably connected to the support plate 2 via bearings. The bearings are standard deep groove ball bearings, and their models are determined according to the dimensions of the support roller 5. The shaft of the support roller 5 is made of 45# steel, and its hardness reaches HRC35-40 after quenching and tempering. The shaft of the support roller 5 is installed in the inner ring of the bearing by interference fit, and both ends of the shaft are fixed to the support plate 2 by bolts.

[0046] Specifically, the shape of the support roller 5 is designed according to the shape of the track groove 6 on the rolling track 1, usually V-shaped or U-shaped, and the surface hardness reaches HRC60 or higher. The function of the support roller 5 is to support the support plate 2 and enable the support plate 2 to slide smoothly on the rolling track 1.

[0047] Specifically, the track groove 6 is manufactured by milling or wire cutting, and its surface is precision machined to ensure the smoothness of the support roller 5 when it rolls within it. The function of the track groove 6 is to guide the support roller 5 along a predetermined path, ensuring that the movement trajectory of the support plate 2 is stable and controllable.

[0048] During use, the support roller 5 rolls within the track groove 6, and the support plate 2 is connected to the rolling track 1 via the support roller 5, allowing it to slide freely on the rolling track 1. This rational structure increases the utilization rate of the testing equipment and diversifies the tested products. The reasonable coordination of the support sleeve 3, support plate 2, and support roller 5 enables the fixture to adapt to the testing needs of different types of suspension systems. The coordinated design of the support roller 5 and rolling track 1 facilitates control of the movement of the suspended system under test within a limited space, making the motion trajectory more stable and controllable during the test, and improving the reliability of the test data.

[0049] In the fixture used for fatigue testing of the suspension system in this embodiment, please refer to... Figures 1 to 3 There are two support rollers 5, and the two support rollers 5 and the support sleeve 3 form a triangular structure.

[0050] Specifically, the two support rollers 5 are located on both sides of the support plate 2, forming a triangular structure together with the support sleeve 3. That is, the line connecting the center of the two support rollers 5 and the center of the support sleeve 3 forms an equilateral triangle or an isosceles triangle. This triangular structure has good stability and support performance, which can ensure that the support plate 2 will not tilt or shake when it moves on the rolling track 1.

[0051] During use, the support sleeve 3 is assembled with the support plate 2 and the support roller 5 to form a rolling support structure. The first tapered roller bearing 8 and the second tapered roller bearing 9 are assembled into the support sleeve 3. The tapered ring 7 is assembled into the shaft end of the suspension system 4 under test. The assembled support structure is then assembled onto the shaft. The first washer 11, the lock nut 10, and the second washer 12 are then assembled onto the shaft in sequence and locked with the lock bolt 13. The shaft is then placed in the rolling track 1 and connected to the testing equipment to begin testing.

[0052] 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.

[0053] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0054] 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.

[0055] 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.

[0056] 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 fixture for fatigue testing of suspension systems, characterized in that, The test includes a rolling track and a support sleeve. The shaft end of the suspension system under test is embedded inside the support sleeve, and a bearing assembly is provided between the two. The rolling track is placed above the test equipment, and the support sleeve is slidably connected to the rolling track.

2. The fixture for fatigue testing of suspension systems according to claim 1, characterized in that, The shaft end of the suspension system under test is fitted with a tapered ring, and the bearing assembly is disposed inside the support sleeve. The bearing assembly includes two tapered roller bearings, and the tapered ring is embedded in the inner ring of the adjacent tapered roller bearing.

3. The fixture for fatigue testing of suspension systems according to claim 1, characterized in that, The shaft end of the suspension system under test is provided with a locking nut that is threadedly connected to it. The locking nut is located outside the support sleeve, and a first washer is provided between the two.

4. The fixture for fatigue testing of suspension systems according to claim 3, characterized in that, The locking nut is provided with a locking bolt that is threadedly connected to it, and the end of the locking bolt abuts against the first washer.

5. The fixture for fatigue testing of suspension systems according to claim 4, characterized in that, The locking nut has an annular groove on the side away from the support sleeve, and a second washer that engages with the locking bolt is provided inside the annular groove.

6. The fixture for fatigue testing of suspension systems according to claim 1, characterized in that, The support sleeve is disposed on the support plate, the support plate is provided with a support roller rotatably connected thereto, and the rolling track is provided with a track groove that matches the wheel surface shape of the support roller.

7. The fixture for fatigue testing of a suspension system according to claim 6, characterized in that, There are two support rollers, which together with the support sleeve form a triangular structure.

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