A pull-rivet rotary snap-on self-tightening joint, exhaust system and vehicle

Abstract

The utility model provides a kind of pull rivet rotary buckle type self-tightening joint, exhaust system and vehicle, it is related to automobile exhaust system technical field, the connecting structure includes connecting female head, connecting male head, rotary connecting component and anti-loose component, first passageway is formed in connecting female head inside, the stretch-in section of connecting male head is set in first passageway, second assembly section has second assembly end face;Rotary connecting component includes tenon and spiral groove, respectively set on first assembly end face and second assembly end face;The first groove body and the second groove body of anti-loose component mutually enclose and form anti-loose groove, and elastic anti-loose piece is set in anti-loose groove.Connecting male head and connecting female head are aligned after relative rotation certain angle, tenon slides into along spiral groove and is locked, realizes the quick disassembly quick installation function without tool, improves assembly efficiency, reduces assembly cost.In the process of rotary locking, elastic anti-loose piece is compressed and generates lasting axial pre-tightening force, ensure the long-term stability of connecting structure in vibration environment.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust system technology, and in particular to a riveted rotary snap-fit ​​self-tightening joint, an exhaust system, and a vehicle. Background Technology

[0002] The riveted rotary snap-fit ​​self-tightening joint between the exhaust manifold and the exhaust pipe is a core connecting component of the automotive exhaust system. Its performance directly determines the sealing, stability, and service life of the exhaust system, thereby affecting engine power output, exhaust emission compliance, and overall vehicle driving safety. During engine operation, this riveted rotary snap-fit ​​self-tightening joint must withstand extreme working conditions for extended periods: on the one hand, engine exhaust temperatures can reach 600-1000℃, and the temperature difference between cold start and warm-up operation is drastic, causing significant thermal expansion and contraction displacement of the connecting components; on the other hand, the high-frequency vibrations during engine operation (idle vibration frequency 50-100Hz) are transmitted to the riveted rotary snap-fit ​​self-tightening joint through the exhaust manifold, while the resonance of the exhaust system itself and the bumps during vehicle driving further exacerbate the stress complexity of the connection area.

[0003] For example, patent CN201420593Y discloses a riveted rotary snap-fit ​​self-tightening joint for an automobile engine exhaust manifold and exhaust pipe. The exhaust manifold and exhaust pipe are connected by a flange. Since the exhaust manifold and exhaust pipe are in a continuously vibrating environment, the preload of the bolts will decrease, and the flange sealing joint is prone to vibration loosening and leakage. Utility Model Content

[0004] In view of this, this utility model proposes a riveted rotary snap-fit ​​self-tightening joint, an exhaust system, and a vehicle, which can solve the problem that existing flange connections in a continuously vibrating environment cause the bolt preload to decrease, and the flange sealing joint to vibrate, loosen, and leak.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a riveting rotary snap-fit ​​self-tightening connector, including a connecting female, a connecting male, a rotary connecting assembly, and an anti-loosening assembly, wherein: The female connector has a first channel inside, and the female connector includes a connecting section and a first assembly section connected to each other. The side of the first assembly section away from the connecting section is a first assembly end face. The male connector includes a connecting extension section and a second assembly section. The extension section is disposed within the first channel, and the second assembly section has a second assembly end face that mates with the first assembly end face. The rotary connection assembly includes a rotary-fitting tenon and a helical groove, one of which, the tenon and the helical groove, is disposed on the first mounting end face, and the other is disposed on the second mounting end face; and The anti-loosening component includes a first groove, a second groove, and an elastic anti-loosening element. The first groove is formed on the first assembly end face, and the second groove is formed on the second assembly end face. The first groove and the second groove enclose each other to form an anti-loosening groove, and the elastic anti-loosening element is disposed in the anti-loosening groove.

[0006] Based on the above technical solutions, preferably, a first mating section is provided between the connecting section and the first assembly section, and a second mating section is provided at the end of the extending section away from the second assembly section. Both the first mating section and the second mating section are cone-shaped structures. The second mating section is located in the first channel and mates with the first mating section.

[0007] More preferably, the two ends of the first mating section are a first mating end and a second mating end, respectively. The first mating end is connected to the connecting section, and the second mating end is connected to the first assembly section. The diameter of the first mating end is smaller than the diameter of the second mating end, and a second channel is provided through the male connector.

[0008] Based on the above technical solutions, preferably, a sealing component is also included. The sealing component includes a third groove, a fourth groove, and a first sealing element. The third groove is formed on the first assembly end face, and the fourth groove is formed on the second assembly end face. The third groove and the fourth groove surround each other to form a sealing groove, and the first sealing element is disposed in the sealing groove.

[0009] Based on the above technical solutions, preferably, a limiting ring block is provided on the extension section, the limiting ring block is located at one end of the extension section near the second assembly section, and a limiting ring groove that cooperates with the limiting ring block is opened on the inner wall surface of the second assembly section.

[0010] Based on the above technical solutions, preferably, the connecting section includes a first assembly section, a deformation section, and a second assembly section connected in sequence. The end of the second assembly section away from the deformation section is connected to the first assembly section. A rivet nut is provided in the first assembly section, and an internal thread is formed on the inner wall of the second assembly section. A rivet bolt is connected in the rivet nut, and the rivet bolt is screwed into the internal thread of the second assembly section to deform the deformation section and fix the connecting female head.

[0011] Based on the above technical solutions, preferably, the outer wall surface of the second assembly section is provided with an assembly wing ring, and a second sealing element is provided on the side of the assembly wing ring away from the connecting male head.

[0012] Based on the above technical solutions, preferably, the thermal deformation of the material of the female connector is less than that of the male connector.

[0013] This utility model also provides an exhaust system, including an engine exhaust manifold section, a three-way catalytic converter, and the aforementioned riveted rotary snap-fit ​​self-tightening connector, wherein the female connector is connected to the cavity of the three-way catalytic converter, and the male connector is connected to the exhaust pipe of the engine exhaust manifold section.

[0014] This utility model also provides a vehicle including the aforementioned exhaust system.

[0015] The riveted rotary snap-fit ​​self-tightening joint, exhaust system, and vehicle of this utility model have the following advantages over the prior art: (1) By aligning the male and female connectors and rotating them relative to each other by a certain angle, the locking tenon slides into the spiral groove and locks in place, thereby achieving rapid connection and separation. This enables tool-free quick disassembly and assembly, significantly improving assembly efficiency and avoiding the reliance on torque wrenches and complex tightening sequences required by traditional bolt connections, thus reducing assembly costs and time. During the rotation locking process, the elastic anti-loosening component is compressed and generates a continuous axial preload, effectively solving the risk of loosening caused by engine and exhaust pipe vibration, ensuring the long-term stability of the riveted rotary snap-fit ​​self-tightening joint under vibration environment, and avoiding the problem of preload decay in traditional bolts. (2) The tapered structure of the first and second mating sections provides a self-guiding function when the male and female connectors are connected. During the cold start stage, the tapered mating surfaces fit tightly to form a sealing barrier, providing redundant sealing capability. Together with the first sealing element, they form a multi-level sealing system, avoiding the risk of overall leakage once the traditional single-point gasket seal fails. Attached Figure Description

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

[0017] Figure 1 This is a cross-sectional view of the riveting rotary snap-fit ​​self-tightening joint of this utility model; Figure 2 This is a schematic diagram of the connecting female head in the riveting rotary snap-fit ​​self-tightening joint of this utility model; Figure 3 This is a cross-sectional view of the connecting female head in the riveting rotary snap-fit ​​self-tightening joint of this utility model; Figure 4 This is a schematic diagram of the male connector in the riveting rotary snap-fit ​​self-tightening joint of this utility model; Figure 5 This is a cross-sectional view of the male connector in the riveting rotary snap-fit ​​self-tightening joint of this utility model; Figure 6 This is a cross-sectional view of the riveting rotary snap-fit ​​self-tightening joint of this utility model and its cooperation with the rivet bolt.

[0018] Figure label: 10. Connecting female head; 11. First channel; 12. Connecting section; 121. First assembly section; 122. Deformation section; 123. Second assembly section; 13. First assembly section; 131. First assembly end face; 14. First mating section; 141. First mating end; 142. Second mating end; 15. Limiting ring groove; 16. Assembly wing ring; 17. Second seal; 18. Internal thread; 20. Connecting male connector; 21. Insertion section; 22. Second assembly section; 221. Second assembly end face; 23. Second mating section; 24. Second channel; 25. Limiting ring block; 30. Rotary connecting assembly; 31. Locking tenon; 32. Spiral groove; 40. Anti-loosening component; 41. First groove; 42. Second groove; 43. Elastic anti-loosening element; 44. Anti-loosening groove; 50. Sealing assembly; 51. Third groove; 52. Fourth groove; 53. First seal; 54. Sealing groove; 60. Rivet nut; 70. Rivet bolt. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 6As shown, this utility model provides a riveting rotary snap-fit ​​self-tightening connector, including a female connector 10, a male connector 20, a rotary connecting assembly 30, and an anti-loosening assembly 40. The female connector 10 has a first channel 11 formed inside. The female connector 10 includes a connecting section 12 and a first assembly section 13 connected together. The side of the first assembly section 13 away from the connecting section 12 is a first assembly end face 131. The male connector 20 includes a connecting extension section 21 and a second assembly section 22. The extension section 21 is disposed within the first channel 11, and the second assembly section 22 has a feature that mates with the first assembly end face 131. The second assembly end face 221; the rotary connection assembly 30 includes a rotatably engaging tenon 31 and a spiral groove 32, one of which is disposed on the first assembly end face 131 and the other is disposed on the second assembly end face 221; the anti-loosening assembly 40 includes a first groove 41, a second groove 42 and an elastic anti-loosening element 43, the first groove 41 is opened on the first assembly end face 131, the second groove 42 is opened on the second assembly end face 221, the first groove 41 and the second groove 42 enclose each other to form an anti-loosening groove 44, and the elastic anti-loosening element 43 is disposed in the anti-loosening groove 44.

[0021] By aligning the male connector 20 and the female connector 10 and rotating them relative to each other by a certain angle, the latch 31 slides into and locks along the spiral groove 32, thereby achieving rapid connection and separation. This enables tool-free quick assembly and disassembly, significantly improving assembly efficiency and avoiding the reliance on torque wrenches and complex tightening sequences inherent in traditional bolt connections, thus reducing assembly costs and time. When the male connector 20 and the female connector 10 are mated, the first groove 41 and the second groove 42 enclose each other to form an anti-loosening groove 44, within which an elastic anti-loosening element 43 is disposed. During the rotational locking process, the elastic anti-loosening element 43 is compressed and generates a continuous axial preload, effectively solving the risk of loosening caused by engine and exhaust pipe vibration. This ensures the long-term stability of the riveted rotary snap-fit ​​self-tightening joint under vibration conditions and avoids the preload decay problem of traditional bolts.

[0022] Currently, traditional rivet-type self-tightening joints use flange sealing joints for connection. However, the tightening process of flange sealing joints is demanding, requiring the use of a torque wrench and step-by-step tightening to the specified torque in a diagonal sequence. Incorrect sequence or torque can lead to uneven stress on the flange, causing leakage. Furthermore, each connection point requires the individual installation and tightening of multiple bolts, which is extremely inconvenient in the confined space of the chassis, significantly reducing production line and maintenance efficiency. In some special applications, such as the connection between the engine and exhaust pipe, the continuous vibration of the engine and exhaust pipe can cause a decrease in bolt preload, leading to loosening. Additionally, under the combined effects of high temperature and vibration, even with anti-loosening gaskets on the bolts, the preload will still decay over time, resulting in insufficient gasket compression and exhaust leakage. At the same time, the sealing of flange sealing joints relies entirely on a single flat or corrugated gasket; once the gasket fails, the entire connection fails. The bolts and nuts of the flange sealing joint will be severely corroded and stuck together after being exposed to high temperature, salt and moisture for a long time, making maintenance and disassembly difficult.

[0023] In this embodiment, the circumferential locking of the female connector 10 and the male connector 20 is achieved by the latch 31 sliding into and locking along the spiral groove 32. Combined with the axial pre-tightening of the elastic anti-loosening member 43, the initial sealing pressure and vibration-damping holding force are provided, thereby effectively solving at least some of the above-mentioned problems.

[0024] Optionally, one of the latch 31 and the spiral groove 32 is disposed on the first assembly end face 131, and the other is disposed on the second assembly end face 221. This includes the latch 31 being disposed on the first assembly end face 131 and the spiral groove 32 being disposed on the second assembly end face 221, or the spiral groove 32 being disposed on the first assembly end face 131 and the latch 31 being disposed on the second assembly end face 221. In this embodiment, the spiral groove 32 is disposed on the first assembly end face 131, and the latch 31 is disposed on the second assembly end face 221.

[0025] Optionally, the elastic anti-loosening component 43 includes spring washers, wave springs, and rubber rings. When the male connector 20 and the female connector are locked together by the rotating connection assembly 30, the elastic anti-loosening component 43 is compressed. The restoring force generated by the compression will continuously act between the first assembly end face 131 and the second assembly end face 221, effectively offsetting the small displacement and preload attenuation trend caused by the long-term vibration of the engine and exhaust pipe.

[0026] In some embodiments, the riveted rotary snap-fit ​​self-tightening joint further includes a sealing assembly 50, which includes a third groove 51, a fourth groove 52, and a first seal 53. The third groove 51 is formed on the first assembly end face 131, and the fourth groove 52 is formed on the second assembly end face 221. The third groove 51 and the fourth groove 52 surround each other to form a sealing groove 54, and the first seal 53 is disposed within the sealing groove 54. The first seal 53 is preferably made of a ceramic sealing ring or other high-temperature elastic material to provide an elastic initial seal during cold starts, ensuring immediate airtightness.

[0027] like Figures 1 to 6 As shown, in some embodiments, a first mating section 14 is provided between the connecting section 12 and the first assembly section 13, and a second mating section 23 is provided at the end of the extending section 21 away from the second assembly section 22. Both the first mating section 14 and the second mating section 23 are conical in shape. The second mating section 23 is disposed within the first channel 11 and mates with the first mating section 14. The conical structure of the first mating section 14 and the second mating section 23 provides a self-guiding function when the male connector 20 is connected to the female connector 10. During the cold start stage, the conical mating surfaces fit tightly to form a sealing barrier, providing redundant sealing capability. Together with the first sealing element 53, they form a multi-stage sealing system, avoiding the risk of overall leakage once the traditional single-point gasket seal fails. This ensures the efficient operation of the emission control system and avoids oxygen sensor signal inaccuracy caused by air leakage.

[0028] Furthermore, to meet assembly requirements and achieve the sealing standard for the mating surfaces, the inner surface roughness of the first mating section 14 of the female connector 10 is required to be less than or equal to 0.8 μm, and the outer surface roughness of the second mating section 23 of the male connector 20 is required to be less than or equal to 0.8 μm. This ensures sealing performance, reduces wear, and guarantees the uniformity of the self-tightening effect.

[0029] Furthermore, the first mating section 14 has a first mating end 141 and a second mating end 142 at its two ends. The first mating end 141 is connected to the connecting section 12, and the second mating end 142 is connected to the first assembly section 13. The diameter of the first mating end 141 is smaller than the diameter of the second mating end 142. A second channel 24 is formed through the male connector 20. The second channel 24 and the first channel 11 of the female connector 10 together form a continuous exhaust channel, ensuring smooth airflow and reducing exhaust back pressure. Moreover, through the conical structure, when airflow passes through, due to the Venturi effect, the airflow accelerates in the conical section to generate negative pressure, further pressing the male connector 20 against the female connector 10 for locking and sealing, forming a self-tightening seal, thus improving the reliability of the connection under dynamic operating conditions.

[0030] The diameter φX of the first end 141 needs to be determined according to the specific pipeline requirements. Specifically, the diameter φX of the first end 141 should match the exhaust requirements of the engine to ensure smooth exhaust and reduce the impact of the riveted rotary snap-fit ​​self-tightening joint on engine power and fuel consumption.

[0031] To ensure the sealing reliability of the male connector 20 and the female connector 10, the diameter R of the second assembly section 22, which mates with the first mating end 141, matches the diameter φX of the first mating end 141. R = φX - s - δ, where s is the wall thickness of the female connector 10, and δ is the tapered correction amount. The tapered correction amount δ is used to precisely control the cold-state assembly stress, hot-state interference fit, and sealing band shape, ensuring the system's self-adaptive function. Specifically, the tapered correction amount δ is the interference fit in the diameter direction, which ensures that when the female connector 10 and the male connector 20 are assembled in a cold state, they will undergo a small amount of elastic deformation due to the interference fit, thereby forming a stable and uniform initial contact stress and sealing band on the tapered surface. Therefore, when determining the tapered correction amount δ, it is necessary to first obtain the minimum interference under cold sealing, the minimum effective interference to ensure hot performance, and the maximum interference to ensure structural safety. By comparing the values ​​of the minimum interference under cold sealing and the minimum effective interference to ensure hot performance, δ should be greater than the maximum value between the two and less than the maximum interference to ensure structural safety, so as to ensure the reliability of working performance and structural assembly.

[0032] Furthermore, the angle between the wall of the first mating section 14 and the central axis of the first channel 11 ranges from 10 degrees to 20 degrees. This allows the first mating section 14 to have a gentle guide slope, ensuring good self-centering and alignment with the second mating section 23, enabling rapid insertion; it also facilitates the self-tightening effect of the Venturi effect. In this embodiment, the angle between the wall of the first mating section 14 and the central axis of the first channel 11 ranges from 15 degrees. It should be noted that the limitations on dimensions, etc., in this embodiment are merely exemplary choices, and a certain range of error is allowed during actual processing and manufacturing.

[0033] like Figures 1 to 6As shown, in some embodiments, a limiting ring block 25 is provided on the extension section 21. The limiting ring block 25 is located at one end of the extension section 21 near the second assembly section 22. The inner wall surface of the second assembly section 22 is provided with a limiting ring groove 15 that cooperates with the limiting ring block 25. When the male connector 20 is inserted into the female connector 10, the limiting ring block 25 engages with the limiting ring groove 15, providing axial limiting to prevent the male connector 20 from being over-inserted or dislodged. At the same time, it enhances the overall integrity of the riveted rotary snap-fit ​​self-tightening joint, reduces relative displacement under vibration, further improves the anti-loosening effect, and ensures the proper assembly and stability of the male connector 20 and the female connector 10.

[0034] In some embodiments, the connecting section 12 includes a first assembly section 121, a deformation section 122, and a second assembly section 123 connected sequentially. The end of the second assembly section 123 away from the deformation section 122 is connected to the first assembly section 123. A rivet nut 60 is provided within the first assembly section 121, and an internal thread 18 is formed on the inner wall of the second assembly section 123. A rivet bolt 70 is connected within the rivet nut 60, and the rivet bolt 70 is screwed into the internal thread 18 of the second assembly section 123, causing the deformation section 122 to deform and thus fixing the connecting female head 10. The riveting fixing method enables rapid installation of the connecting female head 10 without welding or complex tools, simplifying the production process and avoiding the disassembly difficulties caused by corrosion in traditional bolt fixing, achieving maintainability without the risk of rust seizure.

[0035] Optionally, the rivet bolt 70 has a through hole that communicates with the first channel 11 or the second channel 24, thereby achieving stable airflow. It should be noted that the location of the through hole is not limited in this embodiment; it can be located in the middle or side of the rivet bolt 70. When located on the side, two or three through holes can be spaced apart to ensure stable airflow. The specific location can be selected according to the requirements of different application scenarios, such as airflow rate requirements, airflow velocity requirements, or airflow discharge location requirements.

[0036] Optionally, the outer wall of the second assembly section 123 is provided with an assembly wing ring 16, and a second seal 17 is provided on the side of the assembly wing ring 16 away from the male connector 20. The assembly wing ring 16 increases the contact area of ​​the female connector 10 for connection, thereby improving installation stability; while the second seal 17 enhances the sealing performance of the female connector 10 after connection. The second seal 17 may include a ceramic sealing ring or other high-temperature elastic material.

[0037] In some embodiments, the thermal deformation of the material of the female connector 10 is less than that of the male connector 20. Through differentiated thermal expansion design, during the warm-up phase, when the exhaust system temperature rises to the optimal operating range of the three-way catalytic converter, the male connector 20 expands significantly due to greater thermal expansion, while the female connector 10 experiences relatively smaller volume changes. This results in a greater clamping force exerted by the male connector 20 on the tapered mating surface of the female connector 10, achieving a thermal expansion self-tightening effect. Thermal stress compensates for material creep or relaxation at high temperatures, avoiding the risks of traditional bolts being stretched or gaskets being crushed, ensuring the sealing reliability of the riveted rotary snap-fit ​​self-tightening joint under high-temperature conditions. The female connector 10 can be made of a low thermal expansion coefficient alloy, such as high-silicon molybdenum ductile iron, nickel cast iron, 409 ferritic stainless steel, or 439 ferritic stainless steel. The male connector 20, on the other hand, uses a high thermal expansion coefficient material, such as 304 stainless steel, 304L stainless steel, 321 stainless steel, or 316 stainless steel.

[0038] In summary, the riveted rotary snap-fit ​​self-tightening joint provided in this application has the following multiple significant advantages. First, the riveted rotary snap-fit ​​self-tightening joint provides an elastic initial seal through the first sealing element 53, ensuring immediate airtightness during cold starts. Through high-precision conical metal surface mating, a robust metal-to-metal primary sealing barrier is formed. Thermal expansion and Venturi effects further compress the sealing surfaces between the first mating section 14 and the second mating section 23 under operating conditions, achieving a self-tightening seal, thus constructing a redundant multi-stage sealing system. Second, when assembling the female connector 10 and the male connector 20, connection can be completed simply by aligning and rotating at one angle, offering a simple operation and tool-free quick-release and quick-installation function. Simultaneously, the riveting fixing method enables rapid installation of the female connector 10, eliminating the need for welding or complex tools, simplifying the production process, and avoiding the disassembly difficulties caused by corrosion in traditional bolt fixing, achieving maintainability without the risk of rust seizure. By precisely matching the thermal expansion coefficients of the materials of the male connector 20 and the female connector 10, the male connector 20 generates greater clamping force on the tapered mating surface of the female connector 10 during thermal expansion, achieving a tighter fit when the engine is warm. This effectively avoids the risks of bolts being stretched by high temperatures or gaskets being crushed in traditional structures, thus realizing the positive utilization of thermal stress. Simultaneously, the tapered structure between the male connector 20 and the female connector 10 provides excellent self-guiding during the initial connection phase. Ultimately, through the combined effect of all these technological advantages, the efficient operation of the entire engine emission control system is ensured. Reliable sealing eliminates oxygen sensor signal inaccuracies caused by air leakage, thereby guaranteeing precise control of the air-fuel ratio by the engine electronic control unit and ensuring the three-way catalytic converter always operates at its optimal state.

[0039] like Figures 1 to 6As shown above, this application provides a riveted rotary snap-fit ​​self-tightening connector. The female connector 10 is riveted to the cavity of the three-way catalytic converter by riveting bolts 70. The male connector 20 is connected to the exhaust pipe of the engine exhaust manifold section by welding or a quick-connect structure of the same level. Then, the female connector 10 and the male connector 20 are locked by the rotary connection assembly 30. During the rotation locking process, the elastic anti-loosening member 43 is compressed and generates a continuous axial preload. After locking is completed, the male connector 20 and the female connector 10 are sealed by the first sealing member 53.

[0040] In this embodiment, the quick-connect structure uses the same rotary connecting component 30 to connect the male connector 20 to the exhaust pipe, or a similar structure, such as a snap-fit. When the male connector 20 is connected using the rotary connecting component 30, the end of the male connector 20 used to connect to the exhaust pipe is also provided with a riveted rotary snap-fit ​​self-tightening connector for connection, which will not be described in detail here.

[0041] Based on the same concept, such as Figures 1 to 6 As shown, this utility model also provides an exhaust system, including an engine exhaust manifold section, a three-way catalytic converter, and the aforementioned riveted rotary snap-fit ​​self-tightening connector. The female connector 10 is connected to the cavity of the three-way catalytic converter, and the male connector 20 is connected to the exhaust pipe of the engine exhaust manifold section. The female connector 10 is connected to the cavity of the three-way catalytic converter by riveting or welding, while the male connector 20 is connected to the exhaust pipe of the engine exhaust manifold section by welding. In actual assembly, the insertion section 21 of the male connector 20 is aligned with the first channel 11 of the female connector 10 and inserted, and then the male connector 20 is rotated until the locking position of the latch 31 is reached. In the cold state, reliable connection is achieved by relying on the pre-tightening force of the anti-loosening component 40, the elastic seal of the sealing component 50, and the metal seal of the conical surface. In the hot state, the thermal expansion difference of the materials and the Venturi effect of the airflow further enhance the sealing and locking, ensuring that the exhaust system always operates in an optimal airtight environment.

[0042] Based on the same concept, this utility model embodiment also provides a vehicle including the exhaust system described in the above embodiment.

[0043] In the vehicle described in this embodiment, during actual assembly, the male connector 20 is inserted by aligning its extension section 21 with the first channel 11 of the female connector 10, and then rotated until the locking position of the latch 31 is achieved. In a cold state, reliable connection is achieved through the pre-tightening force of the anti-loosening component 40, the elastic seal of the sealing component 50, and the metal seal of the conical surface. In a hot state, the difference in thermal expansion of the materials and the Venturi effect of the airflow further enhance the seal and locking, ensuring that the exhaust system always operates in an optimal airtight environment.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A riveting rotary snap-fit ​​self-tightening joint, characterized in that, Includes a female connector (10), a male connector (20), a swivel connector assembly (30), and an anti-loosening assembly (40), wherein: The connector (10) has a first channel (11) inside. The connector (10) includes a connecting section (12) and a first assembly section (13) connected to each other. The side of the first assembly section (13) away from the connecting section (12) is a first assembly end face (131). The male connector (20) includes a connected insertion section (21) and a second assembly section (22). The insertion section (21) is disposed in the first channel (11), and the second assembly section (22) has a second assembly end face (221) that mates with the first assembly end face (131). The rotary connection assembly (30) includes a rotatable latch (31) and a spiral groove (32), one of the latch (31) and the spiral groove (32) being disposed on the first assembly end face (131) and the other being disposed on the second assembly end face (221); The anti-loosening component (40) includes a first groove (41), a second groove (42), and an elastic anti-loosening element (43). The first groove (41) is opened on the first assembly end face (131), and the second groove (42) is opened on the second assembly end face (221). The first groove (41) and the second groove (42) enclose each other to form an anti-loosening groove (44), and the elastic anti-loosening element (43) is disposed in the anti-loosening groove (44).

2. The riveting rotary snap-fit ​​self-tightening joint as described in claim 1, characterized in that: A first mating section (14) is provided between the connecting section (12) and the first assembly section (13). A second mating section (23) is provided at the end of the extension section (21) away from the second assembly section (22). Both the first mating section (14) and the second mating section (23) are cone-shaped. The second mating section (23) is located in the first channel (11) and mates with the first mating section (14).

3. The riveting rotary snap-fit ​​self-tightening joint as described in claim 2, characterized in that: The first mating section (14) has a first mating end (141) and a second mating end (142) at its two ends. The first mating end (141) is connected to the connecting section (12), and the second mating end (142) is connected to the first assembly section (13). The diameter of the first mating end (141) is smaller than the diameter of the second mating end (142). A second channel (24) is provided through the male connector (20).

4. The riveting rotary snap-fit ​​self-tightening joint as described in claim 1, characterized in that: It also includes a sealing assembly (50), which includes a third groove (51), a fourth groove (52) and a first seal (53). The third groove (51) is formed on the first assembly end face (131), and the fourth groove (52) is formed on the second assembly end face (221). The third groove (51) and the fourth groove (52) surround each other to form a sealing groove (54), and the first seal (53) is disposed in the sealing groove (54).

5. The riveting rotary snap-fit ​​self-tightening joint as described in claim 1, characterized in that: The extension section (21) is provided with a limiting ring block (25), the limiting ring block (25) is located at one end of the extension section (21) near the second assembly section (22), and the inner wall surface of the second assembly section (22) is provided with a limiting ring groove (15) that cooperates with the limiting ring block (25).

6. The riveting rotary snap-fit ​​self-tightening joint as described in claim 1, characterized in that: The connecting section (12) includes a first assembly section (121), a deformation section (122), and a second assembly section (123) connected in sequence. The end of the second assembly section (123) away from the deformation section (122) is connected to the first assembly section (13). A rivet nut (60) is provided in the first assembly section (121). An internal thread (18) is formed on the inner wall of the second assembly section (123). A rivet bolt (70) is connected in the rivet nut (60). The rivet bolt (70) is screwed into the internal thread (18) of the second assembly section (123) to deform the deformation section (122) and fix the connecting head (10).

7. The riveting rotary snap-fit ​​self-tightening joint as described in claim 6, characterized in that: The outer wall of the second assembly section (123) is provided with an assembly wing ring (16), and a second seal (17) is provided on the side of the assembly wing ring (16) away from the connecting male head (20).

8. The riveting rotary snap-fit ​​self-tightening joint as described in any one of claims 1-7, characterized in that: The thermal deformation of the material of the female connector (10) is less than that of the male connector (20).

9. An exhaust system, characterized in that: It includes an engine exhaust manifold section, a three-way catalytic converter, and a riveted rotary snap-fit ​​self-tightening connector as described in any one of claims 1-8, wherein the female connector (10) is connected to the cavity of the three-way catalytic converter, and the male connector (20) is connected to the exhaust pipe of the engine exhaust manifold section.

10. A vehicle, characterized in that: Includes the exhaust system as described in claim 9.

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