A connection structure for an air filter outlet pipe

Abstract

This invention provides a connection structure for an air filter outlet pipe, belonging to the field of motorcycle technology. It solves the problem of loosening or detachment of existing air filter outlet pipes. The connection structure includes a buffer sleeve made of elastic material with a snap-fit ​​section. The buffer sleeve is inserted into the mounting port of the air filter housing, and the outer wall of the snap-fit ​​section is snapped and fixed to the edge of the mounting port. One end of the buffer sleeve is located outside the air filter housing and is inserted into and fixedly connected to the air inlet end of the outlet pipe. An inner support sleeve is fixedly installed inside the buffer sleeve, and the outer wall of the inner support sleeve abuts against the inner wall of the snap-fit ​​section. A buffer gap exists between the end of the inner support sleeve near the outlet pipe and the air inlet end of the outlet pipe. This invention not only effectively prevents the outlet pipe from loosening or detaching but also has the advantage of low improvement cost, making it suitable for widespread use.

Description

Technical Field

[0001] This invention belongs to the field of motorcycle technology and relates to a connection structure for an air filter outlet pipe. Background Technology

[0002] An air filter is a device that filters impurities from the air using a filter element, and it is generally used in the filtration system of an engine. When the engine is working, it needs to absorb air filtered by the air filter, so the condition of the air filter is related to the lifespan of the engine.

[0003] A conventional air filter has a structure similar to that of a motorcycle air filter disclosed in patent literature (application number: 200710078671.X). This air filter comprises components such as an air filter housing, an air filter cover, an air filter element, an intake pipe, an exhaust pipe, an intake connector, and clamps. An exhaust port is formed on the wall of the air filter housing. The edge of the exhaust port wall is inserted into an annular groove on the outer wall of the exhaust pipe's intake end and fixed by adhesive. The exhaust end of the exhaust pipe is connected to the engine during use. This air filter has the following drawbacks: motorcycle air filters are typically fixed to the frame, with the air filter fixed relative to the frame. However, some motorcycles, in order to improve overall riding comfort, use a soft-connection suspension for the engine, allowing the engine to move slightly back and forth at high or low speeds. This soft-connection suspension absorbs engine vibration, thereby improving overall riding comfort. However, in this air filter, the air filter is fixed relative to the frame while the engine can move to a certain extent relative to the frame. As a result, when the engine drops or vibrates, the stress on the exhaust pipe cannot be released and is concentrated at the glued joint, which can cause the exhaust pipe to loosen or even fall off, thus greatly affecting the mechanical stability of the motorcycle. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a connection structure for the air filter outlet pipe. This invention solves the problem that the air filter outlet pipe is prone to loosening or falling off.

[0005] The objective of this invention can be achieved through the following technical solution: a connection structure for an air filter outlet pipe, the air filter including an outlet pipe and an air filter housing with an installation port, the connection structure including a buffer sleeve with a snap-fit ​​section and made of elastic material, the buffer sleeve being inserted into the installation port and the outer wall of the snap-fit ​​section being snap-fitted and fixed to the edge of the installation port, one end of the buffer sleeve being located outside the air filter housing and being inserted into and fixedly connected to the air inlet end of the outlet pipe, an inner support sleeve being fixedly provided inside the buffer sleeve, the outer wall of the inner support sleeve abutting against the inner wall of the snap-fit ​​section, and a buffer gap being provided between the end of the inner support sleeve near the outlet pipe and the air inlet end of the outlet pipe.

[0006] A buffer sleeve is fixedly installed inside the mounting opening of the air filter housing. One end of the buffer sleeve is inserted into the air inlet end of the exhaust pipe to form a fixed connection. This allows the exhaust pipe to be connected to the air filter housing via the buffer sleeve, rather than being directly fixed to the air filter housing as in conventional techniques. Because the buffer sleeve is elastic, even if the exhaust pipe shifts relative to the air filter housing when the engine drops or vibrates, the buffer sleeve's adaptive deformation provides cushioning and shock absorption. This prevents the connection between the air filter housing and the buffer sleeve, as well as the connection between the exhaust pipe and the buffer sleeve, from being subjected to rigid pulling, ensuring the stability of the exhaust pipe installation and effectively preventing loosening or even detachment of the exhaust pipe.

[0007] Furthermore, by fixing an inner support sleeve inside the buffer sleeve to support it, radial shrinkage of the buffer sleeve can be prevented, ensuring that the outer wall of the snap-fit ​​section of the buffer sleeve can be firmly snapped and fixed to the edge of the mounting opening, thus preventing the buffer sleeve from loosening or falling off. Simultaneously, because there is a buffer gap between the end of the inner support sleeve near the exhaust pipe and the intake end of the exhaust pipe, the exhaust pipe can undergo not only axial but also radial displacement relative to the air filter housing when the engine drops or vibrates. This avoids rigid pulling on the connection of the exhaust pipe, further improving the stability of the exhaust pipe installation connection.

[0008] In the aforementioned air filter outlet pipe connection structure, the buffer sleeve has one end located outside the air filter housing as its outer end and the other end as its inner end. An integrally formed collapsible section is formed between the outer end of the buffer sleeve and the snap-fit ​​section. The outer wall of the collapsible section protrudes radially outward along the buffer sleeve, while the inner wall forms a depression. This collapsible section's convex-concave structure allows it to deform promptly and effectively during engine drops or vibrations, thus preventing rigid pulling on the outlet pipe connection and further improving the stability of the outlet pipe installation connection.

[0009] In the aforementioned air filter outlet pipe connection structure, the outer wall of the snap-fit ​​section has a circumferentially arranged annular groove, and the edge of the mounting port is embedded in the annular groove. This design facilitates the snap-fit ​​fixing of the buffer sleeve, making its installation convenient. Simultaneously, since an inner support sleeve is also fixedly installed inside the buffer sleeve, this inner support sleeve prevents radial shrinkage of the buffer sleeve, ensuring that the edge of the mounting port remains stably embedded in the annular groove, thus resulting in high installation stability of the buffer sleeve. Therefore, this invention, through the design of the inner support sleeve and the annular groove, achieves a dual guarantee of buffer sleeve installation convenience and stability.

[0010] In the aforementioned air filter outlet pipe connection structure, the inner wall of the snap-fit ​​section has a circumferentially arranged annular protrusion. This annular protrusion and the annular groove are radially opposite to each other on the buffer sleeve. The outer wall of the inner support sleeve has a circumferentially arranged annular positioning groove, and the annular protrusion is embedded in the annular positioning groove. By embedding the annular protrusion on the inner wall of the snap-fit ​​section into the annular positioning groove, the connection and fixation between the inner support sleeve and the buffer sleeve are achieved. The buffer sleeve is made of an elastic material, thus it can deform. Since the annular protrusion and the annular groove are radially opposite to each other on the buffer sleeve, the edge of the mounting opening also forms a radially opposite arrangement. The edge of the mounting opening provides support, ensuring that the annular protrusion of the buffer sleeve does not deform radially outward. This ensures that the annular protrusion is always stably embedded in the annular positioning groove, guaranteeing good connection stability between the inner support sleeve and the buffer sleeve.

[0011] In the aforementioned air filter outlet pipe connection structure, the end of the inner support sleeve closest to the outlet pipe is the outer end of the inner support sleeve, and the other end is the inner end of the inner support sleeve. The outlet pipe has an inner hole arranged along its axial direction. The outer end of the inner support sleeve extends into the inner hole from the air inlet end of the outlet pipe. The diameter of the air inlet end port is larger than the outer diameter of the outer end of the inner support sleeve, and a buffer gap is formed between the inner wall of the outlet pipe and the outer wall of the inner support sleeve. The outer end of the inner support sleeve extending into the inner hole from the air inlet end of the outlet pipe prevents a large amount of gas from entering the space between the inner support sleeve and the buffer sleeve, allowing the gas to smoothly enter the outlet pipe through the buffer sleeve, improving the exhaust efficiency of the air filter, and thus improving the performance of the air filter. Based on this, since the diameter of the intake port is larger than the outer diameter of the outer end of the inner support sleeve, a buffer gap is formed between the inner wall of the exhaust pipe and the outer wall of the inner support sleeve. In this way, when the engine drops or vibrates, the exhaust pipe can adjust its displacement relative to the inner support sleeve, thereby avoiding hard pulling on the exhaust pipe connection and improving the stability of the exhaust pipe installation connection.

[0012] In the aforementioned air filter outlet pipe connection structure, the inner bore has a flared section whose diameter gradually decreases from the air inlet end of the outlet pipe to the middle of the outlet pipe, and the outer end of the inner support sleeve extends into this flared section. The inner wall of the flared section is flared, which facilitates the smooth entry of gas from the inner support sleeve into the outlet pipe, thereby improving the exhaust efficiency and performance of the air filter.

[0013] In the aforementioned air filter outlet pipe connection structure, the outer wall of the inner support sleeve has a circumferentially arranged annular rib. The side of the annular rib facing away from the outlet pipe abuts against the annular protrusion. The minimum diameter of the flared section is smaller than the outer diameter of the outer end of the inner support sleeve. When the outlet pipe moves towards the mounting port until the inner wall of the flared section abuts against the inner support sleeve, there is a gap between the end face of the inlet end of the outlet pipe and the annular rib. Because the minimum diameter of the flared section is smaller than the outer diameter of the outer end of the inner support sleeve, when the engine vibrates, causing the outlet pipe to move towards the mounting port, after moving a certain distance, the inner wall of the flared section will abut against the inner support sleeve, thereby limiting the travel distance of the outlet pipe towards the mounting port. This ensures that there is always a gap between the end face of the inlet end of the outlet pipe and the annular rib, preventing the outlet pipe from frequently impacting the connection between the buffer sleeve and the air filter housing, ensuring good connection stability between the buffer sleeve and the air filter housing, and further preventing the outlet pipe from falling off.

[0014] In the aforementioned air filter outlet pipe connection structure, the opening edge of the inner end of the buffer sleeve is turned outward to form an arc-shaped flange arranged circumferentially around the buffer sleeve. The inner wall of the buffer sleeve also has an annular snap-fit ​​groove adjacent to the arc-shaped flange, and the outer wall of the inner support sleeve has an annular snap-fit ​​part arranged circumferentially, which is embedded in the annular snap-fit ​​groove. The arc-shaped flange design increases the opening size of the inner end of the buffer sleeve, increases the exhaust volume, and allows gas to flow smoothly over the arc-shaped surface of the arc-shaped flange, enabling the gas to smoothly enter the outlet pipe, thus improving the exhaust efficiency and performance of the air filter. By setting an annular snap-fit ​​groove adjacent to the arc-shaped flange, and embedding the annular snap-fit ​​part in the annular snap-fit ​​groove, the connection stability between the inner support sleeve and the buffer sleeve can be further improved.

[0015] In the aforementioned air filter outlet pipe connection structure, the outer wall of the air inlet end of the outlet pipe has a circumferentially arranged positioning groove, and the inner wall of the buffer sleeve has a circumferentially arranged positioning protrusion. A clamp is fitted onto the outer wall of the buffer sleeve to press and fix the positioning protrusion within the positioning groove. This structure, by using the clamp to press and fix the positioning protrusion within the positioning groove, ensures good connection stability between the outlet pipe and the buffer sleeve, preventing the outlet pipe from detaching from the buffer sleeve.

[0016] In the aforementioned air filter outlet pipe connection structure, the inner support sleeve is made of metal or plastic, the buffer sleeve is made of rubber, the buffer sleeve has a circular cross-section, and the longitudinal section of the collapse section is V-shaped or U-shaped. Preferably, the inner support sleeve is made of plastic. The circular cross-section of the buffer sleeve not only facilitates its manufacturing but also makes it easy to match and connect with the installation port and the outlet pipe. The V-shaped or U-shaped longitudinal section of the collapse section allows stress to concentrate at the peak of the V-shape or U-shape when the collapse section is subjected to external force, thus ensuring that the collapse section can deform in a timely and effective manner, thereby avoiding rigid tension on the outlet pipe connection and further improving the stability of the outlet pipe installation connection.

[0017] Compared with existing technologies, the connection structure of the air filter outlet pipe has the following advantages:

[0018] 1. This invention achieves a flexible connection between the exhaust pipe and the air filter housing by setting a buffer sleeve. This allows the exhaust pipe to shift relative to the air filter housing when the engine drops or vibrates, as the buffer sleeve can adapt to deformation and thus play a role in buffering and shock absorption. This prevents the connection between the air filter housing and the buffer sleeve, as well as the connection between the exhaust pipe and the buffer sleeve, from being subjected to hard pulling, effectively avoiding the exhaust pipe from becoming loose or even falling off.

[0019] 2. An inner support sleeve is fixed inside the buffer sleeve. The inner support sleeve supports the buffer sleeve and can prevent the buffer sleeve from shrinking radially. This ensures that the outer wall of the snap-fit ​​section of the buffer sleeve can be firmly snapped and fixed to the edge of the installation port, thereby preventing the buffer sleeve from loosening or falling off.

[0020] 3. The improvements of this invention can not only effectively prevent the air outlet tube from becoming loose or falling off, but also have the advantage of low improvement cost, so it is suitable for widespread use. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the present invention.

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 This is a partial structural diagram of the present invention.

[0024] Figure 4 This is a schematic diagram of the buffer sleeve.

[0025] Figure 5 This is a schematic diagram of the inner support sleeve.

[0026] In the diagram, 1. Air outlet pipe; 11. Air inlet end; 12. Inner hole; 121. Flared section; 13. Positioning groove; 2. Air filter housing; 21. Mounting port; 3. Buffer sleeve; 31. Snap-fit ​​section; 32. Collapse section; 33. Annular snap-fit ​​groove; 34. Annular protrusion; 35. Arc-shaped flange; 36. Annular snap-fit ​​groove; 37. Positioning protrusion; 4. Inner support sleeve; 41. Annular positioning groove; 42. Annular rib; 43. Annular snap-fit ​​part; 5. Buffer gap; 6. Clamp. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, in the connection structure of the air filter outlet pipe 1, the air filter includes an outlet pipe 1 and an air filter housing 2 with an installation port 21. This connection structure includes a buffer sleeve 3 made of elastic material and having a snap-fit ​​section 31. The buffer sleeve 3 is inserted into the installation port 21, and the outer wall of the snap-fit ​​section 31 is snapped and fixed to the edge of the installation port 21. One end of the buffer sleeve 3 is located outside the air filter housing 2 and is inserted into and fixedly connected to the air inlet end 11 of the outlet pipe 1. An inner support sleeve 4 is fixedly installed inside the buffer sleeve 3. The outer wall of the inner support sleeve 4 abuts against the inner wall of the snap-fit ​​section 31. A buffer gap 5 exists between the end of the inner support sleeve 4 near the outlet pipe 1 and the air inlet end 11 of the outlet pipe 1. The inner support sleeve 4 is made of plastic material, but it can also be made of metal. The buffer sleeve 3 is made of rubber material.

[0029] like Figure 2 and Figure 4 As shown, the buffer sleeve 3 has one end outside the air filter housing 2 as its outer end and the other end as its inner end. A collapsible section 32 is integrally formed between the outer end of the buffer sleeve 3 and the snap-fit ​​section 31. The outer wall of the collapsible section 32 protrudes radially outward along the buffer sleeve 3, while the inner wall forms a depression. The cross-section of the buffer sleeve 3 is circular, and the longitudinal section of the collapsible section 32 is V-shaped, or it could be U-shaped. The collapsible section 32 adopts a convex-concave structure, allowing it to deform promptly and effectively when the engine drops or vibrates, thus avoiding rigid pulling on the connection of the exhaust pipe 1 and further improving the stability of the exhaust pipe 1 installation connection. The outer wall of the snap-fit ​​section 31 has an annular groove 33 arranged circumferentially, and the edge of the mounting opening 21 is embedded in the annular groove 33. The inner wall of the snap-fit ​​section 31 has an annular protrusion 34 arranged circumferentially. The annular protrusion 34 and the annular groove 33 are arranged opposite each other radially to the buffer sleeve 3, and are engaged. Figure 5As shown, the outer wall of the inner support sleeve 4 has an annular positioning groove 41 arranged circumferentially, and the annular protrusion 34 is embedded in the annular positioning groove 41.

[0030] like Figure 2 As shown, in the connection structure of the air filter outlet pipe 1 described above, one end of the inner support sleeve 4 near the outlet pipe 1 is the outer end of the inner support sleeve 4, and the other end is the inner end of the inner support sleeve 4. The outlet pipe 1 has an inner hole 12 arranged along its axial direction. The outer end of the inner support sleeve 4 extends into the inner hole 12 from the air inlet end 11 of the outlet pipe 1. The diameter of the air inlet end 11 port is larger than the outer diameter of the outer end of the inner support sleeve 4, and a buffer gap 5 is formed between the inner wall of the outlet pipe 1 and the outer wall of the inner support sleeve 4.

[0031] like Figure 2 As shown, the inner hole 12 has a flared section 121 whose diameter gradually decreases from the air inlet end 11 of the air outlet pipe 1 to the middle of the air outlet pipe 1, and the outer end of the inner support sleeve 4 extends into the flared section 121. Combined with... Figure 2 and Figure 5 As shown, the outer wall of the inner support sleeve 4 has an annular rib 42 arranged circumferentially. The side of the annular rib 42 facing away from the air outlet pipe 1 abuts against the annular protrusion 34. The minimum diameter of the flared section 121 is smaller than the outer diameter of the outer end of the inner support sleeve 4. When the air outlet pipe 1 moves toward the mounting port 21 until the inner wall of the flared section 121 abuts against the inner support sleeve 4, there is a gap between the end face of the air inlet end 11 of the air outlet pipe 1 and the annular rib 42.

[0032] like Figure 2 and Figure 3 As shown, the opening edge of the inner end of the buffer sleeve 3 is turned outward to form an arc-shaped flange 35 arranged circumferentially along the buffer sleeve 3. The inner wall of the buffer sleeve 3 also has an annular snap-fit ​​groove 36 adjacent to the arc-shaped flange 35. The outer wall of the inner support sleeve 4 has an annular snap-fit ​​part 43 arranged circumferentially, which is embedded in the annular snap-fit ​​groove 36. The outer wall of the air inlet end 11 of the air outlet pipe 1 has a positioning groove 13 arranged circumferentially. The inner wall of the buffer sleeve 3 has a positioning protrusion 37 arranged circumferentially. A clamp 6 is fitted on the outer wall of the buffer sleeve 3 to press and fix the positioning protrusion 37 into the positioning groove 13.

[0033] In this invention, because the buffer sleeve 3 is elastic, even if the exhaust pipe 1 shifts relative to the air filter housing when the engine drops or vibrates, the buffer sleeve 3 can adapt to deformation, thus providing cushioning and shock absorption. This prevents the connection between the air filter housing 2 and the buffer sleeve 3, as well as the connection between the exhaust pipe 1 and the buffer sleeve 3, from being subjected to rigid pulling, ensuring the stability of the exhaust pipe 1 installation and effectively preventing it from loosening or even falling off. Furthermore, by fixing an inner support sleeve 4 inside the buffer sleeve 3 to support it, radial contraction of the buffer sleeve 3 is prevented, ensuring that the outer wall of the snap-fit ​​section 31 of the buffer sleeve 3 can be firmly snapped and fixed to the edge of the mounting opening 21, thereby preventing the buffer sleeve 3 from loosening or falling off.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as 1. air outlet pipe; 11. air inlet end; 12. inner hole; 121. flared section; 13. positioning groove; 2. air filter housing; 21. mounting port; 3. buffer sleeve; 31. snap-fit ​​section; 32. collapsible section; 33. annular snap-fit ​​groove; 34. annular protrusion; 35. arc-shaped flange; 36. annular snap-fit ​​groove; 4. inner support sleeve; 41. annular positioning groove; 42. annular rib; 43. annular snap-fit ​​part; 5. buffer gap; 6. clamp, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A connection structure for an air filter outlet pipe, the air filter comprising an outlet pipe (1) and an air filter housing (2) having a mounting port (21), characterized in that, This connection structure includes a buffer sleeve (3) with a snap-fit ​​section (31) and made of elastic material. The buffer sleeve (3) is inserted into the mounting port (21) and the outer wall of the snap-fit ​​section (31) is snapped and fixed to the edge of the mounting port (21). One end of the buffer sleeve (3) is located outside the air filter housing (2) and is inserted into the air inlet end (11) of the air outlet pipe (1) to form a fixed connection. An inner support sleeve (4) is fixedly installed inside the buffer sleeve (3). The outer wall of the inner support sleeve (4) abuts against the inner wall of the snap-fit ​​section (31). There is a buffer gap (5) between the end of the inner support sleeve (4) near the air outlet pipe (1) and the air inlet end (11) of the air outlet pipe (1).

2. The connection structure of the air filter outlet pipe according to claim 1, characterized in that, The buffer sleeve (3) is located outside the air filter housing (2) at one end, which is the outer end of the buffer sleeve (3) and at the other end, which is the inner end of the buffer sleeve (3). The outer end of the buffer sleeve (3) and the snap-fit ​​section (31) are integrally formed with a collapsible section (32). The outer wall of the collapsible section (32) protrudes outward along the radial direction of the buffer sleeve (3) and the inner wall forms a depression.

3. The connection structure of the air filter outlet pipe according to claim 1 or 2, characterized in that, The outer wall of the snap-fit ​​section (31) has an annular groove (33) arranged circumferentially, and the edge of the mounting port (21) is embedded in the annular groove (33).

4. The connection structure of the air filter outlet pipe according to claim 3, characterized in that, The inner wall of the snap-fit ​​section (31) has an annular protrusion (34) arranged circumferentially. The annular protrusion (34) and the annular slot (33) are arranged opposite to each other in the radial direction of the buffer sleeve (3). The outer wall of the inner support sleeve (4) has an annular positioning groove (41) arranged circumferentially. The annular protrusion (34) is embedded in the annular positioning groove (41).

5. The connection structure of the air filter outlet pipe according to claim 4, characterized in that, The inner support sleeve (4) has an outer end near the air outlet pipe (1) and an inner end near the air outlet pipe (1). The air outlet pipe (1) has an inner hole (12) arranged along its axial direction. The outer end of the inner support sleeve (4) extends into the inner hole (12) from the air inlet end (11) of the air outlet pipe (1). The diameter of the air inlet end (11) is larger than the outer diameter of the outer end of the inner support sleeve (4), and the buffer gap (5) is formed between the inner wall of the air outlet pipe (1) and the outer wall of the inner support sleeve (4).

6. The connection structure of the air filter outlet pipe according to claim 5, characterized in that, The inner hole (12) has a flared section (121) whose diameter gradually decreases from the air inlet end (11) of the air outlet pipe (1) to the middle of the air outlet pipe (1), and the outer end of the inner support sleeve (4) extends into the flared section (121).

7. The connection structure of the air filter outlet pipe according to claim 5, characterized in that, The outer wall of the inner support sleeve (4) has an annular rib (42) arranged circumferentially. The side of the annular rib (42) facing away from the air outlet pipe (1) abuts against the annular protrusion (34). The minimum diameter of the flared section (121) is smaller than the outer diameter of the outer end of the inner support sleeve (4). When the air outlet pipe (1) moves toward the mounting port (21) and abuts against the inner wall of the flared section (121) with the inner support sleeve (4), there is a gap between the end face of the air inlet end (11) of the air outlet pipe (1) and the annular rib (42).

8. The connection structure of the air filter outlet pipe according to claim 2, characterized in that, The opening edge of the inner end of the buffer sleeve (3) is turned outward to form an arc-shaped flange (35) arranged circumferentially along the buffer sleeve (3). The inner wall of the buffer sleeve (3) also has an annular snap-fit ​​groove (36) adjacent to the arc-shaped flange (35). The outer wall of the inner support sleeve (4) has an annular snap-fit ​​part (43) arranged circumferentially. The annular snap-fit ​​part (43) is embedded in the annular snap-fit ​​groove (36).

9. The connection structure of the air filter outlet pipe according to claim 1 or 2, characterized in that, The air inlet (11) of the air outlet pipe (1) has a positioning groove (13) arranged in the circumferential direction on the outer wall, and the inner wall of the buffer sleeve (3) has a positioning protrusion (37) arranged in the circumferential direction. The outer wall of the buffer sleeve (3) is fitted with a clamp (6) to press and fix the positioning protrusion (37) in the positioning groove (13).

10. The connection structure of the air filter outlet pipe according to claim 2, characterized in that, The inner support sleeve (4) is made of metal or plastic material, the buffer sleeve (3) is made of rubber material, the cross-section of the buffer sleeve (3) is circular, and the longitudinal section of the collapse section (32) is V-shaped or U-shaped.

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