A connection structure for exhaust pipe docking

Abstract

The utility model relates to a kind of connecting structure for exhaust pipeline butt joint including male pipe, female pipe, hoop body, bolt and nut, the right end of male pipe is aligned female pipe left end and is pushed into to complete sleeve connection, hoop body is annular structure, then hoop body is covered in female pipe left end and covers the connecting place of male pipe and female pipe, the through hole of two connecting parts is aligned, then the stem of bolt is passed through two connecting parts, stem end is threaded section, the front end of threaded section is toothed cylindrical section, toothed cylindrical section outer surface is formed with the tooth that extends axially and is distributed in the circumferential direction around stem, the tooth that extends axially on stem is contacted with the inner wall of through hole, toothed cylindrical section and the through hole of connecting part form the circumferential locking of toothed friction, reduce the circumferential micro-motion of bolt relative to connecting part in vibration environment, improve the anti-loose reliability of nut in long-term vibration working condition, further guarantee the compression force of hoop body to the connecting place of male pipe and female pipe, avoid the pipeline leakage risk caused by bolt loosening.

Description

Technical Field

[0001] This utility model relates to the field of exhaust pipe docking technology, and in particular to a connection structure for exhaust pipe docking. Background Technology

[0002] Existing exhaust pipe connection technologies often employ a structure where male and female pipes are joined and secured with a clamp. The clamp consists of a main body and two connecting parts. After a bolt passes through the through holes of the two connecting parts, a nut is threadedly connected to the bolt. The head of the nut is pressed tightly against the head of the bolt, thus securing the male and female pipes together with the clamp body. Under vibration conditions such as those caused by an engine, gaps exist between the bolt and the through hole. Due to continuous vibration, the bolt is prone to circumferential micro-movement, and the threaded connection between the bolt and the nut gradually loosens, causing the pipe connection seal to fail.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a connection structure for connecting exhaust pipes, which solves the problem that gaps exist between bolts and through holes, and that continuous vibration can easily cause circumferential micro-movements in the bolts, leading to the gradual loosening of the threaded connection between the bolts and nuts and resulting in the failure of the pipe connection seal.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A connection structure for connecting exhaust pipes, characterized in that it comprises:

[0007] Public administration;

[0008] The female tube, with its left end fitted onto the right end of the male tube;

[0009] The clamp body is a ring structure. The clamp body is sleeved on the left end of the female tube and clamps the male tube and the female tube. An opening is opened at the upper end of the clamp body. Connecting parts extending toward the upper end of the clamp body are formed at both ends corresponding to the opening. The connecting parts are provided with through holes.

[0010] A bolt, comprising a head and a shank, the shank being connected to the head, the end of the shank being a threaded section, the front end of the threaded section being a toothed cylindrical section, the outer surface of the toothed cylindrical section being formed with axially extending teeth continuously distributed around the shank in a circumferential direction; the shank passing through two through holes;

[0011] Nut, which is threadedly connected to the threaded section.

[0012] A further technical solution is that the front end of the toothed cylindrical segment is a smooth cylindrical segment, the front end of the smooth cylindrical segment is connected to the head, and the outer surface of the smooth cylindrical segment is a smooth cylindrical surface.

[0013] A further technical solution is that the bolt is also provided with a first locking member, which is located in the middle of the two connecting parts and fits the inner shape of the connecting parts, and the rod can pass through the first locking member.

[0014] A further technical solution is that the bolt is also provided with a second locking member, the second locking member is located on the outside of the connecting part near the end of the nut, the second locking member fits the shape of the outside of the connecting part, the rod can pass through the second locking member, the end of the nut near the connecting part abuts against and presses against the second locking member, and the second locking member abuts against and presses against the connecting part.

[0015] A further technical solution is that the bolt is also provided with a washer, which is located between the nut and the second locking member.

[0016] A further technical solution is that the connecting part is an arc-shaped double-layer structure, the connecting part includes a first arc segment, a connecting segment and a second arc segment, the first arc segment is recessed towards the opening direction, the lower end of the first arc segment is connected to the clamp body, the second arc segment is recessed towards the opening direction, the second arc segment fits into the first arc segment, and the upper ends of the first arc segment and the upper ends of the second arc segment are respectively connected to the two sides of the connecting segment.

[0017] A further technical solution is that the left end of the female tube is provided with a snap-fit ​​groove, and the right end of the male tube is provided with a protrusion that matches the snap-fit ​​groove; the left end of the female tube is sleeved on the right end of the male tube, and the protrusion is snapped into the snap-fit ​​groove.

[0018] A further technical solution is that several slots are also provided on the left side of the mother tube.

[0019] The beneficial effects of this utility model embodiment are as follows:

[0020] (i) A connection structure for connecting exhaust pipes includes a male pipe, a female pipe, a clamp body, a bolt, and a nut. The right end of the male pipe is aligned with the left end of the female pipe and pushed in to complete the connection. The clamp body has a ring structure. The clamp body is then fitted onto the left end of the female pipe, covering the connection between the male and female pipes, so that the through holes of the two connection parts are aligned. Then, the shank of the bolt passes through the two connection parts. The end of the shank is a threaded section, and the front end of the threaded section is a toothed cylindrical section. The outer surface of the toothed cylindrical section has axially extending teeth that are continuously distributed around the shank in a circumferential direction. After tightening, the axially extending teeth on the shank contact the inner wall of the through hole. The toothed cylindrical section and the through hole of the connection part form a toothed friction circumferential locking, which reduces the circumferential micro-movement of the bolt relative to the connection part under vibration environment, improves the anti-loosening reliability of the nut under long-term vibration conditions, and thus ensures the clamping force of the clamp body on the connection between the male and female pipes, avoids the risk of pipe leakage caused by bolt loosening, and maintains the stable sealing pressure of the pipe connection.

[0021] (ii) Furthermore, the front end of the toothed cylindrical segment is a smooth cylindrical segment, and the front end of the smooth cylindrical segment is connected to the head. The outer surface of the smooth cylindrical segment is a smooth cylindrical surface. Its smooth cylindrical surface provides low-friction axial guidance for the bolt to pass through the through hole of the clamp connection, ensuring that the toothed cylindrical segment is accurately positioned to the target area.

[0022] (iii) Furthermore, the left end of the female pipe is provided with a snap-fit ​​groove, and the right end of the male pipe is provided with a protrusion that matches the snap-fit ​​groove. The left end of the female pipe is fitted onto the right end of the male pipe, and the protrusion is snapped into the snap-fit ​​groove. Before the clamp body is pressed, the relative displacement of the male and female pipes is pre-constrained, which speeds up the installation process of the male and female pipes and improves the efficiency of exhaust pipe connection.

[0023] (iv) Furthermore, several slots are provided on the left side of the main pipe. These slots provide circumferential elastic deformation space for the main pipe, so that the clamping compression pressure is evenly applied to the wall of the main pipe, avoiding damage to the main pipe caused by local stress concentration. Attached Figure Description

[0024] Figure 1 This is an isometric view of a connection structure for an automotive exhaust pipe according to the present invention.

[0025] Figure 2 This is a side view of the connection structure of an automobile exhaust pipe according to the present invention.

[0026] Figure 3 This is an isometric view of the bolts in the connection structure of an automobile exhaust pipe according to this utility model.

[0027] Figure 4 This is an isometric view of the pipe connection structure in an automobile exhaust pipe according to the present invention.

[0028] In the picture:

[0029] 100. Male pipe; 101. Protrusion; 200. Female pipe; 201. Snap-fit ​​groove; 202. Slot; 300. Clamp body; 310. Opening; 320. Connecting part; 321. Through hole; 322. First arc-shaped segment; 323. Connecting segment; 324. Second arc-shaped segment; 400. Bolt; 410. Head; 420. Rod part; 421. Threaded segment; 422. Toothed cylindrical segment; 423. Smooth cylindrical segment; 500. Nut; 600. First locking element; 700. Second locking element; 800. Washer. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0031] Currently, the design of chassis systems for new energy vehicles equipped with two power systems occupies most of the chassis space, limiting the design space for other chassis components. The traditional exhaust pipe connection method generally uses flanges welded to the ends of the exhaust pipes to align the two heavy flanges and connect them with several bolts and nuts. The installation under the traditional process makes the product heavier, and the flanges used for docking according to the chassis system design occupy even more space. At the same time, the installation efficiency is low due to the fixed connection by bolts and nuts. Based on this, the inventors of this application provide the following embodiments.

[0032] Example:

[0033] Figure 1 This is an isometric view of a connection structure for an automotive exhaust pipe according to the present invention. Figure 2 This is a side view schematic diagram of the connection structure of an automotive exhaust pipe according to this utility model. Figures 1-2As shown, a connection structure for connecting exhaust pipes includes a male pipe 100, a female pipe 200, a clamp body 300, a bolt 400, and a nut 500. The left end of the female pipe 200 is fitted onto the right end of the male pipe 100. The clamp body 300 has a ring structure, fitting onto the left end of the female pipe 200 and clamping the male pipe 100 and the female pipe 200. An opening 310 is provided at the upper end of the clamp body 300, and connecting portions 320 extending towards the upper end of the clamp body 300 are formed at both ends corresponding to the opening 310. The connecting portions 320 have through holes 321. For example, the connecting part 320 has an arc-shaped double-layer structure. The connecting part 320 includes a first arc-shaped segment 322, a connecting segment 323 and a second arc-shaped segment 324. The first arc-shaped segment 322 is recessed in the direction of the opening 310. The lower end of the first arc-shaped segment 322 is connected to the clamp body 300. The second arc-shaped segment 324 is recessed in the direction of the opening 310. The second arc-shaped segment 324 fits against the first arc-shaped segment 322. The upper ends of the first arc-shaped segment 322 and the upper ends of the second arc-shaped segment 324 are respectively connected to the two sides of the connecting segment 323.

[0034] Figure 3 This is an isometric view of the bolts in the connection structure of an automotive exhaust pipe according to this utility model. Figure 3 As shown, the bolt 400 includes a head 410 and a shank 420, which are connected to the head 410. The end of the shank 420 is a threaded section 421, and the front end of the threaded section 421 is a toothed cylindrical section 422. The outer surface of the toothed cylindrical section 422 has axially extending teeth continuously distributed around the shank 420. The shank 420 passes through two through holes 321, and the nut 500 is threadedly connected to the threaded section 421. Exemplarily, the side of the head 410 near the connecting portion 320 conforms to the outer shape of the connecting portion 320, and the longitudinal section of the side of the head 410 away from the connecting portion 320 has a rectangular structure with rounded corners.

[0035] like Figure 3 As shown, further, the front end of the toothed cylindrical segment 422 is a smooth cylindrical segment 423, and the front end of the smooth cylindrical segment 423 is connected to the head 410. The outer surface of the smooth cylindrical segment 423 is a smooth cylindrical surface. Its smooth cylindrical surface provides low-friction axial guidance for the bolt 400 to pass through the through hole 321 of the clamp connection part 320, ensuring that the toothed cylindrical segment 422 is accurately positioned to the target area.

[0036] like Figures 1-2As shown, the bolt 400 is further provided with a first locking member 600. The first locking member 600 is located in the middle of the two connecting parts 320 and fits the inner shape of the connecting parts 320. The rod part 420 can pass through the first locking member 600. The first locking member 600 fits the inner side of the two connecting parts 320 to maintain the coaxiality of the two through holes 321. When the clamp body 300 is locked, part of the toothed cylindrical section 422 is located inside the first locking member 600. The toothed cylindrical section 422 and the first locking member 600 also form a toothed friction circumferential lock, which avoids radial loosening of the connection structure under vibration conditions and improves the anti-loosening reliability of the connection structure.

[0037] like Figures 1-2 As shown, the bolt 400 further includes a second locking member 700, located on the outer side of the connecting portion 320 near the end of the nut 500. The second locking member 700 fits snugly against the outer side of the connecting portion 320, and the rod portion 420 can pass through it. The end of the nut 500 near the connecting portion 320 abuts against and presses against the second locking member 700, which in turn presses against and presses against the connecting portion 320. For example, the bolt 400 also includes a washer 800, positioned between the nut 500 and the second locking member 700. The second locking member converts the locking force of the nut 500 into uniform radial pressure by fitting against the curved surface of the outer side of the connecting portion 320. The washer 800 prevents plastic deformation of the second locking member 700 by dispersing the pressure of the nut 500, thus avoiding damage to the connecting portion 320 during the rotation and compression process of the nut 500.

[0038] Figure 4 This is an isometric view of the pipe connection structure in an automotive exhaust pipe according to this utility model. Figure 4 As shown, the left end of the female pipe 200 is provided with a snap-fit ​​groove 201, and the right end of the male pipe 100 is provided with a protrusion 101 that matches the snap-fit ​​groove 201. The left end of the female pipe 200 is fitted onto the right end of the male pipe 100, and the protrusion 101 is snapped into the snap-fit ​​groove 201. Before the clamp body 300 is pressed, the relative displacement of the male and female pipes 200 is pre-constrained, which speeds up the installation process of the male pipe 100 and the female pipe 200 and improves the efficiency of exhaust pipe docking.

[0039] like Figure 4 As shown, furthermore, several slots 202 are provided on the left side of the main tube 200. The slots 202 provide circumferential elastic deformation space for the main tube 200, so that the clamping compression pressure is evenly applied to the wall of the main tube 200, avoiding damage to the main tube 200 caused by local stress concentration.

[0040] In operation, this embodiment is as follows:

[0041] During assembly, first align the protrusion 101 on the right end of the male pipe 100 with the snap-fit ​​groove 201 on the left end of the female pipe 200 and push it in to complete the connection. Then, fit the clamp body 300 onto the left end of the female pipe 200, covering the connection between the male pipe 100 and the female pipe 200, aligning the through holes 321 of the two connecting parts 320. Next, pass the shank 420 of the bolt 400 through the through hole 321 of the left connecting part 320, the first locking member 600, and the through hole of the right connecting part 320 in sequence. 321. The second locking member 700 and the washer 800 are tightened, and the nut 500 is tightened. The nut 500 applies axial pressure to the second locking member 700 through the washer 800. The head 410 applies axial pressure to the left connecting part 320, pushing the two connecting parts 320 to produce elastic deformation. At the same time, the slot 202 on the mother tube 200 provides radial deformation space for the mother tube 200, so that the clamp body 300 uniformly contracts and presses the male tube 100 and the mother tube 200.

[0042] In this embodiment, the axially extending teeth on the rod 420 contact the inner wall of the through hole 321, and the toothed cylindrical section 422 forms a circumferential locking of toothed friction with the through hole 321 of the connecting part 320. This reduces the circumferential micro-movement of the bolt 400 relative to the connecting part 320 under vibration conditions, improves the anti-loosening reliability of the nut 500 under long-term vibration conditions, and thus ensures the clamping force of the clamp body 300 on the connection between the male pipe 100 and the female pipe 200, avoids the risk of pipeline leakage caused by the loosening of the bolt 400, and maintains the stable sealing pressure of the pipeline connection.

[0043] Compared to the traditional flange connection process, the connection structure in this embodiment features a more compact clamp design, saving more space in the vehicle chassis. The clamp is also lighter, improving the overall lightweighting of the exhaust system. Finally, the clamp design is less expensive than the flange process, saving on pipe connection costs.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A connection structure for connecting exhaust pipes, characterized in that, include: Public Administration (100); The left end of the female tube (200) is fitted onto the right end of the male tube (100); The clamp body (300) is a ring structure. The clamp body (300) is sleeved on the left end of the female tube (200) and clamps the male tube (100) and the female tube (200). An opening (310) is opened at the upper end of the clamp body (300). A connecting part (320) extending toward the upper end of the clamp body (300) is formed at both ends of the clamp body (300) corresponding to the opening (310). A through hole (321) is opened in the connecting part (320). A bolt (400) includes a head (410) and a shank (420), the shank (420) being connected to the head (410), the end of the shank (420) being a threaded section (421), the front end of the threaded section (421) being a toothed cylindrical section (422), the outer surface of the toothed cylindrical section (422) being formed with axially extending teeth continuously distributed around the shank (420); the shank (420) passing through two through holes (321). Nut (500), which is threadedly connected to the threaded segment (421).

2. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: The front end of the toothed cylindrical segment (422) is a smooth cylindrical segment (423), the front end of the smooth cylindrical segment (423) is connected to the head (410), and the outer surface of the smooth cylindrical segment (423) is a smooth cylindrical surface.

3. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: The bolt (400) is also provided with a first locking member (600), which is located in the middle of the two connecting parts (320) and fits the inner shape of the connecting part (320). The rod (420) can pass through the first locking member (600).

4. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: The bolt (400) is also provided with a second locking member (700), which is located on the outside of the connecting part (320) near the end of the nut (500). The second locking member (700) fits the shape of the outside of the connecting part (320). The rod (420) can pass through the second locking member (700). The end of the nut (500) near the connecting part (320) abuts against and presses against the second locking member (700), and the second locking member (700) abuts against and presses against the connecting part (320).

5. The connection structure for connecting exhaust pipes according to claim 4, characterized in that: The bolt (400) is also provided with a washer (800), which is located between the nut (500) and the second locking member (700).

6. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: The connecting part (320) is an arc-shaped double-layer structure. The connecting part (320) includes a first arc-shaped segment (322), a connecting segment (323) and a second arc-shaped segment (324). The first arc-shaped segment (322) is recessed towards the opening (310). The lower end of the first arc-shaped segment (322) is connected to the clamp body (300). The second arc-shaped segment (324) is recessed towards the opening (310). The second arc-shaped segment (324) fits against the first arc-shaped segment (322). The upper end of the first arc-shaped segment (322) and the upper end of the second arc-shaped segment (324) are respectively connected to the two sides of the connecting segment (323).

7. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: The left end of the female tube (200) is provided with a snap-fit ​​groove (201), and the right end of the male tube (100) is provided with a protrusion (101) that matches the snap-fit ​​groove (201); the left end of the female tube (200) is sleeved on the right end of the male tube (100), and the protrusion (101) is snapped into the snap-fit ​​groove (201).

8. The connection structure for connecting exhaust pipes according to claim 1, characterized in that: Several slots (202) are also provided on the left side of the mother tube (200).

Images