A device for eccentric bolt riveting strength detection

Abstract

This utility model discloses a device for testing the riveting strength of eccentric bolts, including a universal testing machine, a base, and a sleeve. The base is placed on the testing platform of the universal testing machine. The base has a threaded hole at its central axis for screwing in the shank of the eccentric bolt. The sleeve has a through hole for the head of the eccentric bolt to pass through. A gap is left between the inner wall of the through hole and the outer wall of the head of the eccentric bolt. After the sleeve passes through the head of the eccentric bolt, it contacts the washer of the eccentric bolt and applies vertical pressure to the washer of the eccentric bolt under the action of the loading head of the universal testing machine. The advantages are that it can quickly and accurately measure the riveting strength of bolts, is easy to operate, and provides reliable test data.

Description

Technical Field

[0001] This utility model relates to the field of bolt testing technology, and in particular to a device for testing the riveting strength of eccentric bolts. Background Technology

[0002] The eccentric bolt in an automotive suspension system is a core component for chassis tuning, used to precisely adjust wheel alignment parameters (such as camber and toe). Thanks to its eccentric design, it allows for fine-tuning of the control arm or steering knuckle mounting position within a range of ±2° to 5°, compensating for manufacturing tolerances and component deformation, and optimizing tire contact performance and steering response. Compared to traditional fixing bolts, its non-disassembly adjustment design increases assembly efficiency by over 40%, while reducing production line downtime caused by repeated disassembly and assembly by approximately 30%, and reducing tool and component wear.

[0003] As a key connecting component in the automotive suspension system, eccentric bolts are generally composed of hexagonal head bolts and eccentric washers. Based on the current application status in the automotive industry, the processing of eccentric bolts mainly utilizes the interference fit in the product structure to achieve the combination of hexagonal head bolts and eccentric washers. However, if the two are not riveted securely, the washers may loosen during service, potentially leading to misalignment, uneven tire wear, and breakage risks, and even affecting driving safety.

[0004] However, there is currently a lack of specialized equipment on the market for testing the riveting strength of washers in eccentric bolts. Traditional testing methods usually involve manually pulling or striking the bolt washers. This method is highly subjective, the test results are difficult to quantify, and the results are easily affected by human factors. It cannot provide accurate technical parameters for product quality control, cannot meet the requirements for testing speed and accuracy in mass production, and cannot provide reliable assurance for product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a device for testing the riveting strength of eccentric bolts, which can quickly and accurately measure the riveting strength of bolts, is easy to operate, and provides reliable test data.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for testing the riveting strength of eccentric bolts, comprising a universal testing machine, a base, and a sleeve. The base is placed on the testing platform of the universal testing machine. The base has a threaded hole at its central axis for screwing in the shank of the eccentric bolt. The sleeve has a through hole for the head of the eccentric bolt to pass through. A gap is left between the inner wall of the through hole and the outer wall of the head of the eccentric bolt. After the sleeve passes through the head of the eccentric bolt, it contacts the washer of the eccentric bolt and applies vertical pressure to the washer of the eccentric bolt under the action of the loading head of the universal testing machine.

[0007] Preferably, the through hole is a hexagonal through hole, and its distance between opposite sides is 1-2 mm larger than the distance between opposite sides of the bolt head.

[0008] Preferably, the threaded hole is a non-through hole, and its depth is at least twice the diameter of the shank of the eccentric bolt.

[0009] Preferably, both the base and the sleeve are made of 42CrMo material and are heat-treated to a hardness in the range of 45HRC-49HRC.

[0010] Preferably, the base includes a lower frustum and an upper cylinder, the bottom diameter of the frustum is larger than the top diameter, the diameter of the cylinder is the same as the top diameter of the frustum, and the threaded hole is located on the central axis of the cylinder.

[0011] Preferably, the height of the cylinder is less than the length of the threaded section of the eccentric bolt shank, and the height is 15% to 60% of the length of the threaded section of the eccentric bolt shank.

[0012] Preferably, the base has at least two positioning holes at its bottom, which cooperate with the corresponding positioning pins on the universal testing machine's testing platform.

[0013] Preferably, the universal testing machine has a detachable pressure head connected to its loading head, the lower surface of which is used to contact the upper end face of the sleeve.

[0014] Compared with the prior art, the advantages of this utility model are as follows: During operation, the eccentric bolt is first screwed into the threaded hole at the center shaft of the base, and then the sleeve is placed on the hexagonal head of the eccentric bolt. Since an appropriate gap is reserved between the inner wall of the through hole of the sleeve and the outer wall of the bolt head, the sleeve can pass smoothly through the bolt head until it contacts the eccentric washer. When the loading head of the universal testing machine applies vertical pressure downward, this pressure is directly transmitted to the washer of the eccentric bolt through the sleeve. The pressure is gradually increased until the washer separates from the hexagonal head of the bolt. The maximum pressure value recorded at this time is the riveting strength of the washer of the eccentric bolt.

[0015] This device has a simple structure and is easy to operate. It obtains accurate and reliable data through standardized testing methods, which can effectively evaluate the quality of eccentric bolt gasket riveting, provide a scientific basis for product quality control, and effectively prevent safety hazards caused by gasket loosening. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention under test conditions;

[0018] Figure 2 This is a three-dimensional structural diagram of the universal testing machine in this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the base, sleeve, and eccentric bolt in this utility model.

[0020] Figure 4 In this utility model Figure 3 A sectional view;

[0021] In the diagram, 1. Base; 2. Sleeve; 3. Universal testing machine; 4. Test platform; 5. Threaded hole; 6. Rod of eccentric bolt; 7. Through hole; 8. Head of eccentric bolt; 9. Washer of eccentric bolt; 10. Loading head; 11. Frustum; 12. Cylinder; 13. Locating hole; 14. Locating pin; 15. Pressure head. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Example 1: As shown in the figure, a device for testing the riveting strength of eccentric bolts includes a universal testing machine 3, a base 1, and a sleeve 2. The base 1 is placed on the testing platform 4 of the universal testing machine 3. The base 1 has a threaded hole 5 at its central axis position for screwing in the shank 6 of the eccentric bolt. The sleeve 2 has a through hole 7 for the head 8 of the eccentric bolt to pass through. There is a gap between the inner wall of the through hole 7 and the outer wall of the head 8 of the eccentric bolt. After the sleeve 2 passes through the head 8 of the eccentric bolt, it contacts the washer 9 of the eccentric bolt and applies vertical pressure to the washer of the eccentric bolt under the action of the loading head 10 of the universal testing machine 3.

[0024] Example 2: As shown in the figure, unlike Example 1, the through hole 7 of the sleeve 2 is a hexagonal through hole 7, and its distance between opposite sides is 1-2mm larger than the distance between opposite sides of the bolt head.

[0025] With this structural design, sleeve 2 can be smoothly fitted into the hexagonal head of the eccentric bolt without jamming or interference, ensuring a clear and direct force transmission path during testing. When sleeve 2 moves downward under the pressure of universal testing machine 3, due to the appropriate gap between through hole 7 and bolt head, sleeve 2 can completely pass through bolt head and directly contact eccentric washer, thereby applying pressure to the connection interface between washer and bolt head.

[0026] This design avoids force dispersion or deflection during the testing process, ensuring the accuracy and consistency of test data. It also simplifies the operation process, allowing testers to easily complete the test without the need for complex alignment work between the sleeve 2 and the bolt head.

[0027] In this embodiment, the threaded hole 5 is a non-through hole 7, and its depth is at least twice the diameter of the shank 6 of the eccentric bolt.

[0028] In the above structure, the non-through design provides a stable support base 1 for the bolt, avoiding the instability caused by the bolt shank passing through the base 1. The depth of the threaded hole 5 is more than twice the diameter of the bolt shank, ensuring sufficient thread engagement length so that the bolt and the base 1 form a firm connection and will not loosen or deform under the pressure during the test.

[0029] This depth design also increases the contact area of ​​the threads, improving the stability and load-bearing capacity of the entire testing device, while avoiding the risk of thread damage due to insufficient thread engagement. Through this structural design, the testing device can accurately concentrate vertical pressure on the connection surface between the eccentric washer and the bolt head, unaffected by interference from the threaded connection, thus obtaining more accurate and reliable riveting strength test data.

[0030] In this embodiment, both the base 1 and the sleeve 2 are made of 42CrMo material and are heat-treated to a hardness of 45HRC-49HRC.

[0031] 42CrMo is a typical medium-carbon alloy structural steel with excellent mechanical properties, including high strength, good toughness and wear resistance. After heat treatment to reach the specified hardness range, these components achieve an ideal balance of mechanical properties, with sufficient hardness to resist the pressure and wear during the eccentric bolt test, while retaining the necessary toughness to avoid brittle fracture.

[0032] This combination of materials and heat treatment processes ensures that the device maintains stable geometric dimensions and performance during long-term use, without deforming or being damaged due to repeated testing. It can also withstand the large testing force applied by the universal testing machine 3, ensuring the accuracy and consistency of the test results and providing a reliable hardware foundation for evaluating the riveting strength of the eccentric bolt gasket 9.

[0033] Example 3: As shown in the figure, unlike Example 2, the base 1 includes a lower frustum 11 and an upper cylinder 12. The bottom diameter of the frustum 11 is larger than the top diameter, and the diameter of the cylinder 12 is the same as the top diameter of the frustum 11. The threaded hole 5 is located on the central axis of the cylinder 12.

[0034] The bottom diameter of the frustum 11 is larger than its top diameter, forming a stable base that gradually narrows upwards. This structure significantly increases the contact area between the base 1 and the testing platform 4 of the universal testing machine 3, providing greater stability and support, and effectively preventing tilting or swaying that may occur during testing. The upper cylinder 12 has the same top diameter as the frustum 11, forming a smooth transition and avoiding stress concentration. At the same time, it provides sufficient material thickness for the threaded hole 5. The threaded hole 5 is located on the central axis of the cylinder 12, ensuring coaxiality and perpendicularity when the eccentric bolt is installed, and ensuring that the test force is uniformly transmitted along the bolt axis without generating eccentric loads.

[0035] In this embodiment, the height of the cylinder 12 is less than the length of the threaded section of the shank 6 of the eccentric bolt, and the height is 15% to 60% of the length of the threaded section of the shank 6 of the eccentric bolt.

[0036] This height design ensures that the bolt can be fully screwed into the base 1 without being too deep in the threaded hole 5, resulting in insufficient bolt engagement, or too shallow a thread engagement. The lower limit of 15% guarantees the minimum necessary thread engagement length, providing basic connection strength; while the upper limit of 60% avoids excessive thread engagement, saving material on the base 1 and facilitating quick installation and removal of the tested bolts by operators.

[0037] This design maintains an appropriate gap between the washer of the eccentric bolt and the upper surface of the base 1, ensuring that the washer will not contact the base 1 during testing. This concentrates the applied pressure entirely on the riveting interface between the washer and the bolt head, eliminating external interference factors and improving the accuracy and reliability of the test data.

[0038] In this embodiment, the bottom of the base 1 is provided with at least two positioning holes 13, which cooperate with the corresponding positioning pins 14 on the testing platform 4 of the universal testing machine 3.

[0039] With the cooperation of positioning hole 13 and positioning pin 14, base 1 can be quickly and accurately fixed on test platform 4 to prevent translation or rotation displacement caused by external force during the test. This cooperation method is more reliable than relying solely on the friction force of base 1's own weight. Especially when testing high-strength riveting, it can effectively resist the horizontal component force generated by large test force.

[0040] The setting of at least two positioning holes 13 forms a multi-point constraint, which further enhances the positional stability and anti-rotation capability of the base 1. In addition, this positioning method also ensures that the test device can always maintain the same position and attitude when used repeatedly, improving the consistency and comparability of test results.

[0041] In this embodiment, a pressure head 15 is detachably connected to the loading head 10 of the universal testing machine 3, and the lower surface of the pressure head 15 is in contact with the upper end face of the sleeve 2.

[0042] The detachable connection allows the pressure head 15 to be flexibly replaced according to different specifications of sleeve 2 or testing requirements, greatly improving the adaptability and versatility of the device. As a transition element between the loading head 10 and sleeve 2 of the universal testing machine 3, the pressure head 15 can evenly distribute the loading force, avoid stress concentration that may be caused by direct contact between the loading head 10 and sleeve 2, and ensure the accurate transmission of pressure in the vertical direction.

[0043] Furthermore, when the lower surface of the pressure head 15 contacts the upper surface of the sleeve 2, a stable surface contact state is formed, which reduces the instability factors that may be caused by point contact or line contact, and improves the uniformity of force transmission during the test. This structural design also facilitates the observation and adjustment of the test process. Operators can clearly see the contact state between the sleeve 2 and the gasket, and promptly detect and correct any possible deviations, further ensuring the accuracy and reliability of the test results.

[0044] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A device for testing the strength of eccentric bolt riveting, comprising a universal testing machine, characterized in that: It also includes a base and a sleeve. The base is placed on the test platform of the universal testing machine. The base has a threaded hole at its central axis for screwing in the shank of the eccentric bolt. The sleeve has a through hole for the head of the eccentric bolt to pass through. There is a gap between the inner wall of the through hole and the outer wall of the head of the eccentric bolt. After the sleeve passes through the head of the eccentric bolt, it contacts the washer of the eccentric bolt and applies vertical pressure to the washer of the eccentric bolt under the action of the loading head of the universal testing machine.

2. The device for detecting the riveting strength of eccentric bolts according to claim 1, characterized in that: The through hole is a hexagonal through hole, and its distance between opposite sides is 1-2 mm larger than the distance between opposite sides of the bolt head.

3. The device for detecting the strength of eccentric bolt riveting according to claim 1, characterized in that: The threaded hole is a non-through hole, and its depth is at least twice the diameter of the shank of the eccentric bolt.

4. The device for detecting the strength of eccentric bolt riveting according to claim 1, characterized in that: Both the base and the sleeve are made of 42CrMo material and have undergone heat treatment, with their hardness ranging from 45HRC to 49HRC.

5. The device for detecting the riveting strength of eccentric bolts according to claim 1, characterized in that: The base includes a lower frustum and an upper cylinder. The bottom diameter of the frustum is larger than the top diameter, and the diameter of the cylinder is the same as the top diameter of the frustum. The threaded hole is located on the central axis of the cylinder.

6. The device for detecting the riveting strength of eccentric bolts according to claim 5, characterized in that: The height of the cylinder is less than the length of the threaded section of the eccentric bolt shank, and the height is 15% to 60% of the length of the threaded section of the eccentric bolt shank.

7. The device for detecting the strength of eccentric bolt riveting according to claim 5, characterized in that: The base has at least two positioning holes at its bottom, which cooperate with the corresponding positioning pins on the universal testing machine's testing platform.

8. The device for detecting the strength of eccentric bolt riveting according to claim 1, characterized in that: The universal testing machine has a detachable pressure head on its loading head, and the lower surface of the pressure head is used to contact the upper end face of the sleeve.

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