Silencer and motorcycle

Abstract

The silencer comprises a front silencer body and a rear silencer body, the front silencer body comprises a shell and a partition plate, the shell is divided into a first cavity and a second cavity through the partition plate, partition plate holes are formed in the partition plate, a first penetrating hole is formed in the shell, and a first connecting pipe and a second connecting pipe are arranged on the partition plate. The first connecting pipe is communicated with the silencer exhaust pipe and the first cavity, the second connecting pipe is communicated with the second cavity and the rear silencer, waste gas in airflow is treated by the catalytic converter, then passes through the first cavity and the second cavity in sequence, reaches the rear silencer and is exhausted from the rear silencer, the front silencer is used for primary treatment of exhaust sound, and the rear silencer is used for secondary treatment of the exhaust sound. The exhaust sound pressure level is reduced, and required order sound components are output; the rear silencer is used for controlling the proportion of sound components and adjusting the purity of the sound, the power output requirement of the engine is met, and the requirement of the exhaust sound quality characteristic is also met.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle exhaust sound quality, in particular to a muffler and a motorcycle. Background Art

[0002] During the motorcycle riding process, the user's perception mainly comes from control, power and sound. The muffler customized for the racing motorcycle can not only achieve strong power output, but also emit surging exhaust sound waves. After matching with the power, it can improve the user's driving experience.

[0003] When designing the motorcycle exhaust sound, there are phenomena that the sound characteristics of classified models (such as racing models) are not obvious and do not match the models. When users use the vehicle, their evaluation of the sound is usually low, which reduces the user experience, and there is a phenomenon that users modify the exhaust later.

[0004] Therefore, how to make the exhaust sound have the thick characteristics of multi-cylinder large-displacement models, while ensuring the purity of the exhaust sound, controlling the sound pressure level, and enabling customers to feel the excitement brought by the exhaust sound when driving a motorcycle is a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0005] In view of this, the utility model provides a muffler, which adopts a two-stage muffler structure and can perform two-stage modulation on the sound discharged from the engine. It can retain the original medium and low frequency order noise and control the medium and high frequency noise. Not only does the exhaust sound have the thick characteristics of multi-cylinder large-displacement models, but also the purity of the exhaust sound can be ensured and the sound pressure level can be controlled. Matching the sound characteristics of the power and speed of the four-cylinder racing model enables customers to feel the excitement brought by the exhaust sound when driving a motorcycle; the second object of the utility model is to provide a motorcycle including the above muffler.

[0006] The muffler provided by the utility model adopts the following technical scheme:

[0007] A muffler includes a front muffler and a rear muffler. The front muffler includes a housing and a partition. The partition divides the housing into a first chamber and a second chamber. The partition is provided with a partition hole for communicating the first chamber and the second chamber. The partition is provided with a first connecting pipe and a second connecting pipe. The front end of the first connecting pipe is communicated with the muffler exhaust pipe and the rear end is communicated with the first chamber. The front end of the second connecting pipe is communicated with the second chamber and the rear end is communicated with the rear muffler. After the waste gas in the air flow is treated by the catalytic converter, it enters the first chamber through the first connecting pipe, then enters the second chamber through the partition hole, then reaches the rear muffler through the second connecting pipe, and is discharged from the rear muffler.

[0008] Optionally, a first perforation is provided on the housing, a first sound absorber is provided on the housing, and a second sound absorber is provided on the rear muffler.

[0009] Optionally, the housing includes an inner housing and an outer housing. The first perforation is formed in the inner housing within the second chamber. The first sound absorber is disposed between the inner housing and the outer housing. The partition is disposed in the inner housing. The second chamber is located at the front end of the first chamber.

[0010] Optionally, the front end of the housing is recessed downward to form an avoidance chamber.

[0011] Optionally, the diameter of the first connecting pipe is larger than the diameter of the muffler exhaust pipe.

[0012] Optionally, the front end of the first connecting pipe passes through the partition and extends into the first chamber, where a short pipe is provided.

[0013] Optionally, the diameter ratio of the first connecting pipe to the muffler exhaust pipe ranges from 1.5 to 2.5. The length of the short pipe extending into the first chamber ranges from 4 to 12 mm. The diameter ratio of the inner pipe to the second connecting pipe ranges from 0.9 to 1.6.

[0014] Optionally, the rear muffler includes an inner pipe and an outer pipe coaxially disposed outside the inner pipe. The inner pipe communicates with the second connecting pipe. A second perforation is formed at the overlapping position of the inner pipe and the outer pipe. The second sound absorber is disposed between the inner pipe and the outer pipe.

[0015] Optionally, the rear muffler is detachably connected to the front muffler.

[0016] To achieve the above second object, the present invention also provides a motorcycle, which includes any one of the above mufflers. Since the above muffler has the above technical effects, the motorcycle with this muffler should also have corresponding technical effects.

[0017] In summary, the present utility model includes at least one of the following beneficial technical effects: The cylinders of the front muffler and the rear muffler are arranged front and back. The front muffler performs primary processing on the exhaust sound, reducing the exhaust sound pressure level and the required order sound components of the output. The rear muffler is used to control the sound component ratio and adjust the sound purity, meeting both the needs of the engine power output and the exhaust sound quality characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side sectional view of an embodiment of the present utility model;

[0019] Figure 2 is an exploded structural schematic diagram of an embodiment of the present utility model.

[0020] Description of the reference numerals: 1, front muffler; 101, inner shell; 102, outer shell; 103, partition; 2, rear muffler; 201, inner tube; 202, outer tube; 3, partition hole; 4, perforation one; 5, sound absorber one; 6, sound absorber two; 7, connecting pipe one; 8, connecting pipe two; 9, first chamber; 10, second chamber; 11, avoidance chamber; 12, catalytic converter; 13, confluence pipe; 14, engine exhaust pipe; 15, hoop. Specific implementation mode

[0021] The following will Figure 1-2 further describe the present utility model in detail with reference to the accompanying drawings.

[0022] An embodiment of the present utility model discloses a muffler.

[0023] Referring to Figure 1 and Figure 2 , a muffler includes a front muffler 1 and a rear muffler 2. The front muffler 1 includes a housing and a partition 103. The housing includes an inner shell 101 and an outer shell 102. The partition 103 divides the inner shell 101 into a first chamber 9 and a second chamber 10. The first chamber 9 is located behind the second chamber 10. A partition hole 3 for communicating the first chamber 9 and the second chamber 10 is provided on the partition 103. A perforation one 4 is provided on the housing. A sound absorber one 5 is provided on the housing. A sound absorber two 6 is provided on the rear muffler 2. A connecting pipe one 7 and a connecting pipe two 8 are provided on the partition 103. The front end of the connecting pipe one 7 is communicated with the muffler exhaust pipe, and the rear end is communicated with the first chamber 9. The front end of the connecting pipe two 8 is communicated with the second chamber 10, and the rear end is communicated with the rear muffler 2. After the waste gas in the air flow is treated by the catalytic converter 12, it enters the first chamber 9 through the connecting pipe one 7, then enters the second chamber 10 through the partition hole 3, then reaches the rear muffler 2 through the connecting pipe two 8, and is discharged from the rear muffler 2.

[0024] In this embodiment, a two-stage muffler structure is adopted, that is, the front and rear layout of the cylinders of the front muffler 1 and the rear muffler 2 is used to perform two-stage modulation on the sound discharged from the engine. The front muffler 1 is the first-stage treatment of the exhaust sound, reducing the exhaust sound pressure level and the required order sound components of the output; the rear muffler 2 is used to control the proportion of the sound components and adjust the purity of the sound, which not only meets the needs of the engine power output but also meets the needs of the exhaust sound quality characteristics.

[0025] In this embodiment, the front end of the housing is recessed downward to form an avoidance cavity 11, forming a special-shaped structure, which takes into account the vehicle structure layout and the volume of the muffler. The housing includes an inner shell 101 and an outer shell 102. The first perforation 4 is opened in the inner shell 101 located in the second chamber 10, and the first sound absorber 5 is arranged between the inner shell 101 and the outer shell 102 to form an impedance composite muffler. The partition 103 is arranged in the inner shell 101 to divide the inner shell 101 into a first chamber 9 and a second chamber 10. The second chamber 10 is located at the front end of the first chamber 9, forming a two-chamber air flow and sound circuit. Specifically, the avoidance cavity 11 is located in the second chamber 10, so that the space volume of the second chamber 10 is contracted. The engine exhaust sound passes through the first chamber 9 and the second chamber 10, and undergoes volume contraction and expansion changes, performing noise reduction processing and sound frequency adjustment on the original engine exhaust sound. In addition, a double-layer design of the inner shell 101 and the outer shell 102 is adopted, and the first perforation 4 is opened on the inner shell 101 and the first sound absorber 5 is installed, reducing the air flow impact noise and the friction noise between the air flow and the wall surface of the housing, avoiding the influence of the regenerated noise on the exhaust sound, being beneficial to reducing the proportion of medium and high-frequency exhaust noise at the outlet of the front muffler 1, improving the sound purity, and highlighting the order frequency sound.

[0026] In this embodiment, the diameter ratio of the first connecting pipe 7 to the muffler exhaust pipe ranges from 1.5 to 2.5. The large flow cross-section design is adopted to reduce the expansion ratio, ensure the release of the engine exhaust order sound, and the air flow is discharged more smoothly with a small back pressure, ensuring good output power of the engine.

[0027] In this embodiment, the front end of the first connecting pipe 7 passes through the partition 103 and extends into the first chamber 9 and is provided with a short pipe. The short pipe and the first connecting pipe 7 can be integrally formed or separately arranged. In this embodiment, the short pipe and the first connecting pipe 7 are separately arranged, and the length of the short pipe extending into the first chamber 9 ranges from 4 to 12 mm, increasing the output proportion of the medium and low-frequency exhaust sound.

[0028] In this embodiment, the muffler exhaust pipe includes a plurality of engine exhaust pipes 14, a converging pipe 13 and a catalytic converter 12. The converging pipe 13 simultaneously connects the exhaust ports of the plurality of engine exhaust pipes 14 and is connected to the catalytic converter 12. The first connecting pipe 7 is connected to the exhaust port of the catalytic converter 12. Further, the catalytic converter 12 is arranged in the inner shell 101.

[0029] The engine exhaust flows through the plurality of engine exhaust pipes 14 and flows into the catalytic converter 12 through the converging pipe 13. After the waste gas in the air flow is processed by the catalytic converter 12, it reaches the first chamber 9 of the front muffler 1 through the first connecting pipe 7. After the air flow and sound wave expand and dissipate sound in the first chamber 9, they reach the second chamber 10 of the front muffler 1 through the partition hole 3 to dissipate sound again, completing the basic tuning of the exhaust sound through the change of the flow cross-section and volume. The exhaust sound processed by the front muffler 1 reaches the rear muffler 2 through the second connecting pipe 8.

[0030] The rear muffler 2 includes an inner tube 201 and an outer tube 202 coaxially arranged outside the inner tube 201, forming a double-layer cylinder structure of a long cylinder and a ring. The inner tube 201 is communicated with the second connecting pipe 8, a second perforation is provided at the overlapping position of the inner tube 201 and the outer tube 202, and the second sound absorber 6 is arranged between the inner tube 201 and the outer tube 202. The rear muffler 2 is composed of the inner tube 201, the outer tube 202 and the second sound absorber 6 to form a resistive muffler structure. The second sound absorber 6 performs a second tuning on the airflow sound wave entering the inner tube 201, and finally transmits it into the atmosphere.

[0031] The wall surface of the inner tube 201 is perforated. By controlling the opening length and selecting the thickness of the sound-absorbing material, the sound at the outlet of the front muffler 1 is tuned for the second time, which can further adjust the sound frequency distribution, reduce the influence of the non-ordered airflow noise, and improve the purity of the sound; the large-diameter tail pipe design of the rear muffler 2 increases the sound-absorbing area of the fiberglass material, reduces the airflow velocity, makes the exhaust sound wave thick and dense, conforms to the style of the imitation racing car, and has obvious four-cylinder car sound characteristics.

[0032] The diameter ratio range of the inner tube 201 to the second connecting pipe 8 is 0.9 - 1.6. It can not only ensure the installation but also ensure the smoothness of the airflow, and the large-diameter inner tube 201 can increase the contact area between the sound wave and the sound-absorbing material in the rear muffler 2.

[0033] In this embodiment, the rear muffler 2 and the front muffler 1 are detachably connected. Without changing the front muffler 1, different rear mufflers 2 can be matched to meet the user's modification needs. Specifically, the second connecting pipe 8 and the inner tube 201 are detachably connected through a hoop 15.

[0034] The utility model adopts the layout design of the front muffler 1 and the rear muffler 2 to perform two-stage modulation on the sound discharged from the engine, effectively retaining the original medium and low-frequency ordered noise and controlling the medium and high-frequency noise. Not only does the exhaust sound have the thick characteristics of a multi-cylinder large-displacement vehicle, but also the purity of the exhaust sound can be ensured, the sound pressure level can be controlled, and the sound characteristics of the power and speed of the four-cylinder imitation racing model can be effectively matched, enabling the customer to feel the excitement brought by the exhaust sound when driving the motorcycle.

[0035] When designing the utility model, the distribution of the first chamber 9 and the second chamber 10, the pipeline direction, the flow area and the arrangement of the sound absorber are considered, which not only meets the needs of the engine power output but also meets the needs of the exhaust sound quality characteristics.

[0036] In this embodiment, both the first sound absorber 5 and the second sound absorber 6 are made of sound-absorbing cotton. The air pores of the sound-absorbing cotton can disperse and absorb the noise, thus achieving a good sound-absorbing effect, assisting in realizing different exhaust sound effects of the muffler, and meeting the diverse needs of users.

[0037] The structural design of the present utility model enables the exhaust sound to match the racing style of imitation racing motorcycles, with obvious recognition of the exhaust sound of four-cylinder engines, high purity of the exhaust sound, low exhaust back pressure, and good power performance. Moreover, the muffler has a simple structure and reliable technology, and its muffler structure can adapt to the general sound matching of multi-cylinder engines, meeting the unique exhaust sound characteristics of four-cylinder engine vehicles.

[0038] The structures of the front muffler 1 and the rear muffler 2 of the present utility model are suitable for the application of large-displacement multi-cylinder engines. By adjusting the structural dimensions of the front and rear mufflers 2, different exhaust sound effects of the muffler can be achieved to meet the diverse needs of users.

[0039] In this embodiment, the front end is the end close to the muffler exhaust pipe.

[0040] The present invention also provides a motorcycle, which includes the above-mentioned muffler. Since this motorcycle adopts all the above technical solutions, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A muffler, characterized in that: It includes a front muffler and a rear muffler, the front muffler includes a shell and a partition, the partition divides the shell into a first chamber and a second chamber, the partition is provided with a partition hole for connecting the first chamber and the second chamber, the partition is provided with a connecting pipe 1 and a connecting pipe 2, the front end of the connecting pipe 1 is connected to the muffler exhaust pipe, and the rear end is connected to the first chamber, the front end of the connecting pipe 2 is connected to the second chamber, and the rear end is connected to the rear muffler, after the exhaust gas in the airflow is processed by the catalyst, it enters the first chamber through the connecting pipe 1, then enters the second chamber through the partition hole, and then reaches the rear muffler through the connecting pipe 2 and is discharged from the rear muffler.

2. The muffler according to claim 1, characterized in that: The shell is provided with a through hole one, the shell is provided with a sound absorber one, and the rear muffler is provided with a sound absorber two.

3. The muffler according to claim 2, characterized in that: The shell comprises an inner shell and an outer shell, the through hole 1 is opened in the inner shell and is located in the second chamber, the sound absorber 1 is arranged between the inner shell and the outer shell, the partition is arranged in the inner shell, and the second chamber is located at the front end of the first chamber.

4. The muffler according to claim 1, characterized in that: The front end of the shell is recessed downward to form an avoidance cavity.

5. The muffler according to claim 2, characterized in that: The diameter of the connecting pipe 1 is greater than the diameter of the muffler exhaust pipe.

6. The muffler according to claim 5, characterized in that: The front end of the connecting pipe 1 passes through the partition plate and extends into the first chamber, where a short pipe is arranged.

7. The muffler according to claim 6, characterized in that: The rear muffler includes an inner pipe, the diameter ratio of the connecting pipe to the muffler exhaust pipe is in the range of 1.5-2.5, the length of the short pipe extending into the first chamber is in the range of 4-12mm, and the diameter ratio of the inner pipe to the connecting pipe is in the range of 0.9-1.

6.

8. The muffler according to claim 7, characterized in that: The rear muffler comprises an outer tube coaxially arranged outside the inner tube, the inner tube is connected to the second connecting tube, a second through hole is opened at the overlapping position of the inner tube and the outer tube, and the second sound absorber is arranged between the inner tube and the outer tube.

9. The muffler according to claim 1, characterized in that: The rear muffler is detachably connected to the front muffler.

10. A motorcycle, characterized in that: The motorcycle is equipped with a muffler as claimed in any one of claims 1 to 9.

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