Silencing device and motorcycle
By using a multi-cylinder structure and sound-absorbing components, the problem of poor performance in handling high-frequency sharp noise and airflow impact noise in motorcycle mufflers has been solved, resulting in improved exhaust sound purity and auditory experience.
Patent Information
- Application Number
- CN202422556729.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-22
AI Technical Summary
Motorcycle mufflers are poor at handling high-frequency sharp noises and airflow impact noise, resulting in a poor auditory experience for users while riding.
The system adopts a multi-cylinder structure design, including a first cylinder, a second cylinder, and a third cylinder. By setting flow holes and sound-absorbing components, it achieves multiple expansion and compression of the gas. The sound-absorbing components are used to eliminate high-frequency sharp noise and airflow impact noise, and the gas is treated by catalysis in conjunction with a catalyst.
It improves the purity of the exhaust sound, enhances the fullness of the motorcycle at idle and low speed cruising and the sense of power during acceleration, adjusts the thickness and lightness of the exhaust sound, and improves the user's auditory experience.
Smart Images
Figure CN223497982U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of muffler technology, and more specifically, to a muffler device and a motorcycle. Background Technology
[0002] In the realm of two-wheeled motorcycles, motorcycles, with their rugged yet stable appearance, integrate leisure, entertainment, comfort, and cultural experience. These models not only offer a strong visual impact but also ensure user comfort through their unique exhaust note. Specifically, adjusting the low-to-mid-frequency exhaust note below 500Hz enhances the robustness of the exhaust sound at idle and low-speed cruising, as well as the power during acceleration. Adjusting the mid-to-high-frequency exhaust note to 600-800Hz and above 1000Hz ensures both a substantial and brisk exhaust sound.
[0003] However, motorcycle mufflers are not very effective at reducing high-frequency sharp noises and airflow impact noise when processing the exhaust gases from the engine. This results in poor exhaust sound purity, leading to a poor auditory experience for the user while riding and affecting user comfort. Utility Model Content
[0004] The main purpose of this utility model is to provide a muffler and a motorcycle to solve the problem that the existing motorcycle mufflers are not very effective at handling high-frequency sharp noise and airflow impact noise.
[0005] To achieve the above objectives, according to one aspect of the present invention, a noise reduction device is provided, comprising: a first cylinder, a second cylinder, and a third cylinder. The first cylinder is sleeved on the second cylinder, and a first flow hole is provided on the wall of the second cylinder. A first sound-absorbing element is provided between the walls of the first and second cylinders. The second cylinder is sleeved on the third cylinder, and a second flow hole is provided on the wall of the third cylinder. The inner cavity of the third cylinder is connected to a catalyst. The second flow hole and the inner cavity of the third cylinder are connected in communication. The first flow hole and the inner cavity of the second cylinder are connected in communication. The inner cavity of the second cylinder and the second flow hole are connected in communication, so that the gas in the engine exhaust pipe passes sequentially through the third cylinder, the second flow hole, the second cylinder, and the first flow hole before being silenced by the first sound-absorbing element. The central axes of the first, second, and third cylinders are aligned.
[0006] Furthermore, the silencing device also includes: a fourth cylinder, the fourth cylinder and the third cylinder being spaced apart along the axial direction of the first cylinder, a second sound-absorbing element being provided on the outer circumferential side of the fourth cylinder, a third flow hole being provided on the fourth cylinder, the third flow hole being connected to the inner cavity of the fourth cylinder, and the inner cavity of the fourth cylinder being connected to the inner cavity of the second cylinder, so that the gas in the second cylinder is silenced by the second sound-absorbing element after passing through the fourth cylinder and the third flow hole in sequence; and / or, the thickness d1 of the first sound-absorbing element is in the range of 5mm≤d1≤10mm, the diameter t1 of the first flow hole is in the range of 3mm≤t1≤4mm, the thickness d2 of the second sound-absorbing element is in the range of 5mm≤d2≤10mm, and the diameter t2 of the third flow hole is in the range of 3mm≤t2≤5mm.
[0007] Furthermore, the muffler also includes a first connecting pipe and a second connecting pipe. The first end of the first connecting pipe is connected to the engine exhaust pipe, the second end of the first connecting pipe is connected to the first end of the second connecting pipe, and the second end of the second connecting pipe is connected to one end of the third cylinder, so that the gas in the engine exhaust pipe flows through the first connecting pipe and the second connecting pipe in sequence and then enters the inner cavity of the third cylinder.
[0008] Furthermore, the silencing device also includes a first partition plate and a second partition plate. The first partition plate is sleeved on the third cylinder, and the second partition plate is sleeved on the fourth cylinder. Both the first partition plate and the second partition plate extend in the radial direction of the first cylinder. The circumferential end face of the first partition plate abuts against the cylinder wall of the second cylinder, and the circumferential end face of the second partition plate abuts against the cylinder wall of the second cylinder, so that the first partition plate and the second partition plate together divide the inner cavity of the second cylinder into a first chamber, a second chamber, and a third chamber.
[0009] Furthermore, the first partition plate is provided with a plurality of fourth flow holes, which are spaced apart along the circumferential direction of the first partition plate and surround the third cylinder. Both the second chamber and the first chamber are connected to the fourth flow holes, and the second flow holes are connected to the second chamber, so that the gas in the second chamber enters the first chamber through the fourth flow holes.
[0010] Furthermore, the silencing device also includes a plug, which is connected to the first end of the third cylinder to seal the first end of the third cylinder.
[0011] Furthermore, the silencing device also includes a connecting housing, one end of which is connected to the circumferential outer wall of the first connecting pipe, the connecting housing is mounted on the second connecting pipe, and the other end of the connecting housing is connected to the outer wall of the first cylinder.
[0012] Furthermore, the muffler also includes a catalyst, with its two sides connected to the second end of the second connecting pipe and the second end of the third cylinder, respectively. The inlet of the catalyst is connected to the second connecting pipe, and the outlet of the catalyst is connected to the inner cavity of the third cylinder, so that the catalyst catalyzes the gas in the engine exhaust pipe.
[0013] Furthermore, the silencing device also includes a limiting plate, which is sleeved on the catalyst. The circumferential sidewall of the limiting plate is connected to the cylinder wall of the first cylinder to limit the position of the catalyst.
[0014] According to another aspect of the present invention, a motorcycle is provided, including the above-described muffler.
[0015] The silencing device, utilizing the technical solution of this utility model, includes a first cylinder, a second cylinder, and a third cylinder. A first flow hole is provided on the wall of the second cylinder. A first sound-absorbing element is disposed between the walls of the first and second cylinders. A second flow hole is provided on the wall of the third cylinder. Gas from the engine exhaust pipe flows sequentially through the third cylinder, the second flow hole, the second cylinder, and the first flow hole, causing the gas in the engine exhaust pipe to undergo multiple expansions and compressions, thus attenuating the sound energy of the gas in the engine exhaust pipe and achieving noise reduction. Simultaneously, the first sound-absorbing component reduces the high-frequency sharp noise and airflow impact noise in the engine exhaust pipe, improving the purity of the exhaust sound. This solves the problem that existing motorcycle mufflers are ineffective at handling high-frequency sharp noise and airflow impact noise. It enhances the deep and powerful feel of the exhaust sound in the low-frequency order below 500Hz, improving the sense of power during idling and low-speed cruising, and adjusting the high-frequency sound in the 600-800Hz and above 1000Hz ranges to ensure both a heavy and light exhaust sound. Attached Figure Description
[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:
[0017] Figure 1 A schematic diagram of the internal structure of an embodiment of the silencing device according to the present invention is shown;
[0018] Figure 2 A schematic diagram of an embodiment of the silencing device according to the present invention (with the first cylinder and connecting shell removed) is shown.
[0019] Figure 3 A schematic diagram of an embodiment of the silencing device according to the present invention is shown.
[0020] The above figures include the following reference numerals:
[0021] 10. First cylinder; 20. Second cylinder; 30. Third cylinder; 21. First flow hole; 1. First sound-absorbing component; 31. Second flow hole; 40. Fourth cylinder; 2. Second sound-absorbing component; 41. Third flow hole; 50. First connecting pipe; 51. Second connecting pipe; 61. First partition plate; 62. Second partition plate; 3. First chamber; 4. Second chamber; 5. Third chamber; 61.1. Fourth flow hole; 70. Plug; 71. Connecting shell; 73. Catalyst; 80. Limiting plate. Detailed Implementation
[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0025] Please refer to Figures 1 to 3This utility model provides a noise reduction device, comprising: a first cylindrical body 10, a second cylindrical body 20, and a third cylindrical body 30. The first cylindrical body 10 is sleeved on the second cylindrical body 20. A first flow hole 21 is provided on the cylindrical wall of the second cylindrical body 20. A first sound-absorbing element 1 is provided between the cylindrical wall of the first cylindrical body 10 and the cylindrical wall of the second cylindrical body 20. The second cylindrical body 20 is sleeved on the third cylindrical body 30. A second flow hole 31 is provided on the cylindrical wall of the third cylindrical body 30. The inner cavity of the third cylindrical body 30 is connected to the engine exhaust pipe. The inner cavities of the second flow hole 31 and the third cylinder 30 are connected, the inner cavities of the first flow hole 21 and the second cylinder 20 are connected, and the inner cavities of the second cylinder 20 and the second flow hole 31 are connected, so that the gas in the engine exhaust pipe passes through the third cylinder 30, the second flow hole 31, the second cylinder 20 and the first flow hole 21 in sequence and is then silenced by the first sound-absorbing component 1; wherein the central axes of the first cylinder 10, the second cylinder 20 and the third cylinder 30 are arranged to coincide.
[0026] The silencing device of this utility model includes a first cylinder 10, a second cylinder 20, and a third cylinder 30. A first flow hole 21 is provided on the wall of the second cylinder 20. A first sound-absorbing element 1 is provided between the wall of the first cylinder 10 and the wall of the second cylinder 20. A second flow hole 31 is provided on the wall of the third cylinder 30. Gas from the engine exhaust pipe flows sequentially through the third cylinder 30, the second flow hole 31, the second cylinder 20, and the first flow hole 21, causing the gas in the engine exhaust pipe to undergo multiple expansions and compressions, thus attenuating the sound energy of the gas in the engine exhaust pipe and achieving silencing of the engine exhaust pipe. The gas in the exhaust pipe is subjected to noise reduction treatment; at the same time, the high-frequency sharp noise and airflow impact noise of the gas in the engine exhaust pipe are treated by the first sound-absorbing component 1, thereby improving the purity of the exhaust sound. This solves the problem that the existing motorcycle mufflers are not very effective in handling high-frequency sharp noise and airflow impact noise. This allows the low-frequency sound of the exhaust below 500Hz to be enhanced, improving the fullness of the exhaust sound at idle and low-speed cruising and the power during acceleration. The high-frequency sound of the exhaust above 600-800Hz and above 1000Hz is adjusted to ensure the fullness and lightness of the exhaust sound.
[0027] Specifically, the muffler of this application is applicable to the cruiser.
[0028] In this embodiment, the silencing device further includes: a fourth cylinder 40, the fourth cylinder 40 and the third cylinder 30 being spaced apart along the axial direction of the first cylinder 10; a second sound-absorbing element 2 being provided on the outer circumferential side of the fourth cylinder 40; a third flow hole 41 being provided on the fourth cylinder 40; the third flow hole 41 being connected to the inner cavity of the fourth cylinder 40; and the inner cavity of the fourth cylinder 40 being connected to the inner cavity of the second cylinder 20, so that the gas in the second cylinder 20 is silenced by the second sound-absorbing element 2 after passing through the fourth cylinder 40 and the third flow hole 41 in sequence; and / or, the thickness d1 of the first sound-absorbing element 1 is in the range of 5mm≤d1≤10mm, the diameter t1 of the first flow hole 21 is in the range of 3mm≤t1≤4mm, the thickness d2 of the second sound-absorbing element 2 is in the range of 5mm≤d2≤10mm, and the diameter t2 of the third flow hole 41 is in the range of 3mm≤t2≤5mm.
[0029] Specifically, the gas in the engine exhaust pipe flows sequentially through the third cylinder 30 and the second flow hole 31 into the second cylinder 20. Then, the gas in the second cylinder 20 passes sequentially through the fourth cylinder 40 and the third flow hole 41 and is then silenced by the second sound-absorbing component 2. This allows the second sound-absorbing component 2 to silence the high-frequency sharp noise and airflow impact noise in the gas in the second cylinder 20, further improving the purity of the exhaust sound. At the same time, the gas in the second cylinder 20 continuously undergoes expansion and compression for noise reduction, further enhancing the noise reduction effect of the silencer device of this application.
[0030] Specifically, the opening ratio of the second cylinder 20 is 20-25% (i.e., the ratio of the area of the first flow hole 21 to the area of the second cylinder 20), and the opening ratio of the fourth cylinder 40 is 20-30% (i.e., the ratio of the area of the third flow hole 41 to the area of the fourth cylinder 40). The opening lengths of the second cylinder 20 and the fourth cylinder 40 are both 90-120mm. Since the thickness of the first sound-absorbing component 1 and the second sound-absorbing component 2 is greater, the opening ratio of the second cylinder 20 and the fourth cylinder 40 is greater, and the opening length is greater, the high-frequency adjustment capability of the exhaust sound of the first sound-absorbing component 1 and the second sound-absorbing component 2 is stronger, and the sound purity is higher.
[0031] In this embodiment, the muffler also includes a first connecting pipe 50 and a second connecting pipe 51. The first end of the first connecting pipe 50 is connected to the engine exhaust pipe, the second end of the first connecting pipe 50 is connected to the first end of the second connecting pipe 51, and the second end of the second connecting pipe 51 is connected to one end of the third cylinder 30, so that the gas in the engine exhaust pipe flows through the first connecting pipe 50 and the second connecting pipe 51 in sequence and then enters the inner cavity of the third cylinder 30.
[0032] Specifically, the first connecting pipe 50 is used to connect the engine exhaust pipe and the second connecting pipe 51, and the second connecting pipe 51 is used to connect the third cylinder 30 and the first connecting pipe 50, so as to ensure that the gas in the engine exhaust pipe can flow smoothly through the first connecting pipe 50 and the second connecting pipe 51 and then enter the inner cavity of the third cylinder 30, so as to ensure that the muffler of this application can smoothly reduce the noise of the gas in the engine exhaust pipe.
[0033] In this embodiment, the silencing device further includes a first partition plate 61 and a second partition plate 62. The first partition plate 61 is sleeved on the third cylinder 30, and the second partition plate 62 is sleeved on the fourth cylinder 40. Both the first partition plate 61 and the second partition plate 62 extend in the radial direction of the first cylinder 10. The circumferential end face of the first partition plate 61 abuts against the cylinder wall of the second cylinder 20, and the circumferential end face of the second partition plate 62 abuts against the cylinder wall of the second cylinder 20, so that the first partition plate 61 and the second partition plate 62 together divide the inner cavity of the second cylinder 20 to form a first chamber 3, a second chamber 4, and a third chamber 5.
[0034] Specifically, the inner cavity of the second cylinder 20 is divided into a first chamber 3, a second chamber 4, and a third chamber 5 by the first partition plate 61 and the second partition plate 62. The volumes of the first chamber 3, the second chamber 4, and the third chamber 5 are different. Gas from the engine exhaust pipe enters the first chamber 3 and the third chamber 5 from the second chamber 4, respectively. This causes the gas in the second chamber 4 to undergo compression for noise reduction, increasing the noise reduction. At the same time, it guides the contact area and contact time between the gas in the second chamber 4 and the first sound-absorbing component 1 and the second sound-absorbing component 2, improving the utilization rate of the first sound-absorbing component 1 and the second sound-absorbing component 2, as well as the effect of the first sound-absorbing component 1 and the second sound-absorbing component 2 on the treatment of high-frequency sharp noise and airflow impact noise.
[0035] Specifically, the optimal volume ratio of the second chamber 4, the first chamber 3, and the third chamber 5 is 1.5:1:1.4.
[0036] In this embodiment, a plurality of fourth flow holes 611 are provided on the first partition plate 61. The plurality of fourth flow holes 611 are spaced apart along the circumferential direction of the first partition plate 61 and are arranged around the third cylinder 30. The second chamber 4 and the first chamber 3 are both connected to the fourth flow holes 611. The second flow holes 31 are connected to the second chamber 4 so that the gas in the second chamber 4 enters the first chamber 3 through the fourth flow holes 611.
[0037] Specifically, multiple fourth flow holes 611 are used to connect the first chamber 3 and the second chamber 4, ensuring that the gas in the second chamber 4 can flow smoothly into the first chamber 3.
[0038] In this embodiment, the silencing device further includes a plug 70, which is connected to the first end of the third cylinder 30 to seal the first end of the third cylinder 30.
[0039] Specifically, the plug 70 is used to seal the first end of the third cylinder 30 to prevent the gas in the inner cavity of the third cylinder 30 from flowing directly into the inner cavity of the second cylinder 20 from the first end of the third cylinder 30. This ensures that the gas in the inner cavity of the third cylinder 30 can only flow through the second flow hole 31 into the inner cavity of the second cylinder 20, and ensures that the gas in the third cylinder 30 undergoes compression for noise reduction, thereby increasing the noise reduction and controlling the exhaust sound pressure level in a narrow space.
[0040] Specifically, the diameter of the third cylinder 30 is 30mm-45mm, the diameter of the second flow hole 31 is 4mm-6mm, and the opening ratio is 20-30%. According to the overall sound pressure level control requirements of the muffler, the actual exhaust sound pressure level and the output of the engine's order exhaust sound are controlled by adjusting the diameter of the third cylinder 30, the diameter of the second flow hole 31, and the opening ratio. (The exhaust sound pressure level of the cruiser is generally 2-3dB(A) higher than the engine sound pressure level.)
[0041] In this embodiment, the silencing device further includes a connecting housing 71, one end of which is connected to the circumferential outer wall of the first connecting pipe 50, the connecting housing 71 is covered on the second connecting pipe 51, and the other end of the connecting housing 71 is connected to the outer wall of the first cylinder 10.
[0042] Specifically, the connecting housing 71 is used to connect the first connecting pipe 50 and the first cylinder 10, and at the same time, the connecting housing 71 is used to protect the second connecting pipe 51.
[0043] In this embodiment, the muffler also includes a catalyst 73. The two sides of the catalyst 73 are connected to the second end of the second connecting pipe 51 and the second end of the third cylinder 30, respectively. The inlet of the catalyst 73 is connected to the second connecting pipe 51, and the outlet of the catalyst 73 is connected to the inner cavity of the third cylinder 30, so that the catalyst 73 catalyzes the gas in the engine exhaust pipe.
[0044] Specifically, the gas in the engine exhaust pipe flows sequentially through the first connecting pipe 50, the second connecting pipe 51, and the catalyst 73 before entering the inner cavity of the third cylinder 30. This allows the catalyst 73 to catalyze the gas in the engine exhaust pipe, preventing the gas from being directly emitted into the atmosphere and polluting the environment.
[0045] In this embodiment, the silencing device further includes a limiting plate 80, which is sleeved on the catalyst 73. The circumferential sidewall of the limiting plate 80 is connected to the cylinder wall of the first cylinder 10 to limit the catalyst 73.
[0046] Specifically, by connecting the circumferential sidewall of the limiting plate 80 to the cylinder wall of the first cylinder 10, the limiting plate 80 can limit the catalyst 73 and prevent the catalyst 73 from shaking in the radial direction of the fourth cylinder 40.
[0047] This utility model also provides a motorcycle, including the above-mentioned muffler.
[0048] In this embodiment, both the first sound-absorbing component 1 and the second sound-absorbing component 2 are made of sound-absorbing material, which is glass fiber.
[0049] Specifically, this arrangement ensures that the first sound-absorbing component 1 and the second sound-absorbing component 2 effectively filter and reduce high-frequency sharp noise and airflow impact noise.
[0050] Specifically, the first chamber 3, the second chamber 4, and the third chamber 5 of the muffler of this utility model adopt a multi-chamber single-loop series structure design, which makes the muffler of this utility model not require a large installation space. At the same time, the different volumes of the first chamber 3, the second chamber 4, and the third chamber 5 can enhance the noise reduction effect of the muffler of this application. In addition, the muffler of this utility model has a simple structure and is easy to process, with the advantage of low production cost. By adjusting the position and airflow direction of the first chamber 3, the second chamber 4, and the third chamber 5, the unique exhaust sound effect of the cruiser motorcycle is achieved, making the exhaust sound more pleasant and recognizable.
[0051] In practice, the gas in the engine exhaust pipe flows sequentially through the first connecting pipe 50 and the second connecting pipe 51 and then enters the catalytic converter 73. After being treated by the catalytic converter 73, the exhaust gas in the airflow passes through the third cylinder 30 and reaches the first chamber 3, the second chamber 4 and the third chamber 5. The airflow and sound waves expand and silence in each chamber. At the same time, the first sound-absorbing component 1 performs the first sound filtering of mid-to-high frequency noise. The gas in the second chamber 4 passes through the fourth cylinder 40 and then undergoes a second sound filtering and silencing treatment of mid-to-high frequency noise by the second sound-absorbing component 2. Finally, the gas in the fourth cylinder 40 is released into the atmosphere.
[0052] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:
[0053] The muffler of this invention allows the sound of the exhaust gas from the fourth cylinder 40 to match the stable, retro style of the cruiser motorcycle, providing a significant sense of rhythm and high recognizability; the muffler of this invention improves the purity of the exhaust sound and reduces unnecessary noise; the muffler of this invention has a simple design, reliable manufacturing process, and is easy to implement; the structural design of the muffler of this invention is suitable for twin-cylinder engines, meets the unique exhaust sound requirements of the cruiser motorcycle, and improves the overall auditory experience of the vehicle.
[0054] The silencing device of this utility model includes a first cylinder 10, a second cylinder 20, and a third cylinder 30. A first flow hole 21 is provided on the wall of the second cylinder 20. A first sound-absorbing element 1 is provided between the wall of the first cylinder 10 and the wall of the second cylinder 20. A second flow hole 31 is provided on the wall of the third cylinder 30. Gas from the engine exhaust pipe flows sequentially through the third cylinder 30, the second flow hole 31, the second cylinder 20, and the first flow hole 21, causing the gas in the engine exhaust pipe to undergo multiple expansions and compressions, thus attenuating the sound energy of the gas in the engine exhaust pipe and achieving silencing of the engine exhaust pipe. The gas in the exhaust pipe is subjected to noise reduction treatment; at the same time, the high-frequency sharp noise and airflow impact noise of the gas in the engine exhaust pipe are treated by the first sound-absorbing component 1, thereby improving the purity of the exhaust sound. This solves the problem that the existing motorcycle mufflers are not very effective in handling high-frequency sharp noise and airflow impact noise. This allows the low-frequency sound of the exhaust below 500Hz to be enhanced, improving the fullness of the exhaust sound at idle and low-speed cruising and the power during acceleration. The high-frequency sound of the exhaust above 600-800Hz and above 1000Hz is adjusted to ensure the fullness and lightness of the exhaust sound.
Claims
1. A noise reduction device, characterized in that, include: The system comprises a first cylindrical body (10), a second cylindrical body (20), and a third cylindrical body (30). The first cylindrical body (10) is fitted onto the second cylindrical body (20). A first flow hole (21) is provided on the wall of the second cylindrical body (20). A first sound-absorbing element (1) is provided between the wall of the first cylindrical body (10) and the wall of the second cylindrical body (20). The second cylindrical body (20) is fitted onto the third cylindrical body (30). A second flow hole (31) is provided on the wall of the third cylindrical body (30). The inner cavity of the third cylindrical body (30) is connected to the engine exhaust pipe. The second flow hole (31) and the... The inner cavity of the third cylinder (30) is connected, the inner cavity of the first flow hole (21) and the second cylinder (20) are connected, and the inner cavity of the second cylinder (20) and the second flow hole (31) are connected, so that the gas in the engine exhaust pipe passes through the third cylinder (30), the second flow hole (31), the second cylinder (20) and the first flow hole (21) in sequence and is then silenced by the first sound-absorbing component (1); wherein the central axes of the first cylinder (10), the second cylinder (20) and the third cylinder (30) are aligned.
2. The silencing device according to claim 1, characterized in that, The silencing device further includes: A fourth cylinder (40) and the third cylinder (30) are spaced apart along the axial direction of the first cylinder (10). A second sound-absorbing element (2) is provided on the outer circumferential side of the fourth cylinder (40). A third flow hole (41) is provided on the fourth cylinder (40). The third flow hole (41) is connected to the inner cavity of the fourth cylinder (40). The inner cavity of the fourth cylinder (40) is connected to the inner cavity of the second cylinder (20), so that the gas in the second cylinder (20) passes through the fourth cylinder (40) and the third flow hole (41) in sequence and is then silenced by the second sound-absorbing element (2); and / or The thickness d1 of the first sound-absorbing component (1) is in the range of 5mm≤d1≤10mm, the diameter t1 of the first flow hole (21) is in the range of 3mm≤t1≤4mm, the thickness d2 of the second sound-absorbing component (2) is in the range of 5mm≤d2≤10mm, and the diameter t2 of the third flow hole (41) is in the range of 3mm≤t2≤5mm.
3. The silencing device according to claim 1, characterized in that, The muffler also includes a first connecting pipe (50) and a second connecting pipe (51). The first end of the first connecting pipe (50) is connected to the engine exhaust pipe, the second end of the first connecting pipe (50) is connected to the first end of the second connecting pipe (51), and the second end of the second connecting pipe (51) is connected to one end of the third cylinder (30), so that the gas in the engine exhaust pipe flows through the first connecting pipe (50) and the second connecting pipe (51) in sequence and then enters the inner cavity of the third cylinder (30).
4. The silencing device according to claim 2, characterized in that, The silencing device further includes a first partition plate (61) and a second partition plate (62). The first partition plate (61) is sleeved on the third cylinder (30), and the second partition plate (62) is sleeved on the fourth cylinder (40). The first partition plate (61) and the second partition plate (62) both extend in the radial direction of the first cylinder (10). The circumferential end face of the first partition plate (61) abuts against the cylinder wall of the second cylinder (20), and the circumferential end face of the second partition plate (62) abuts against the cylinder wall of the second cylinder (20), so that the first partition plate (61) and the second partition plate (62) together divide the inner cavity of the second cylinder (20) to form a first chamber (3), a second chamber (4), and a third chamber (5).
5. The silencing device according to claim 4, characterized in that, The first partition plate (61) is provided with a plurality of fourth flow holes (611), which are spaced apart along the circumferential direction of the first partition plate (61) and surround the third cylinder (30). The second chamber (4) and the first chamber (3) are both connected to the fourth flow holes (611), and the second flow hole (31) is connected to the second chamber (4) so that the gas in the second chamber (4) enters the first chamber (3) through the fourth flow holes (611).
6. The silencing device according to claim 1, characterized in that, The silencing device also includes a plug (70) which is connected to the first end of the third cylinder (30) to seal the first end of the third cylinder (30).
7. The silencing device according to claim 3, characterized in that, The silencing device further includes a connecting housing (71), one end of which is connected to the circumferential outer wall of the first connecting pipe (50), the connecting housing (71) is covered on the second connecting pipe (51), and the other end of which is connected to the outer wall of the first cylinder (10).
8. The silencing device according to claim 3, characterized in that, The muffler also includes a catalyst (73), the two sides of which are connected to the second end of the second connecting pipe (51) and the second end of the third cylinder (30), respectively. The inlet of the catalyst (73) is connected to the second connecting pipe (51), and the outlet of the catalyst (73) is connected to the inner cavity of the third cylinder (30), so that the catalyst (73) catalyzes the gas in the engine exhaust pipe.
9. The silencing device according to claim 8, characterized in that, The silencing device also includes a limiting plate (80), which is sleeved on the catalyst (73). The circumferential sidewall of the limiting plate (80) is connected to the cylinder wall of the first cylinder (10) to limit the catalyst (73).
10. A motorcycle, characterized in that, The silencing device includes any one of claims 1 to 9.