Broadband low-frequency silencer and motorcycle

Abstract

The broadband low-frequency silencer comprises a silencing cavity defined by a shell, an input pipe communicated with the left side of the silencing cavity, a main exhaust pipe and an auxiliary exhaust pipe communicated with the right side of the silencing cavity, and the exhaust end of the auxiliary exhaust pipe is not communicated with the main exhaust pipe. A control valve is arranged between the main exhaust pipe and the silencing chamber; according to the broadband low-frequency silencer and the motorcycle, the silencer can give out sounds with different qualities and volumes according to different requirements of users, the driving experience is improved, and meanwhile exhaust timbres of the silencers in different modes have large differences in the low-frequency band.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycles, in particular to a broadband low-frequency muffler and a motorcycle. Background Art

[0002] With the improvement of living standards, motorcycles are no longer just a means of transportation. People have higher and higher requirements for the appearance, performance, exhaust sound, etc. of motorcycles. Since the frequency components of exhaust noise are most prominent in the medium and low frequency noise that is closely related to the engine ignition frequency, the engine exhaust muffler is mainly used to regulate low-frequency exhaust noise. In order to output different exhaust sounds, the muffler structure can be designed to be variable to meet the user's sound needs in different scenarios. The current variable muffler mainly changes the volume by changing the flow cross-section of the exhaust channel, but the change in the timbre difference in the low frequency band is not prominent.

[0003] Therefore, there is an urgent need to develop a broadband low-frequency muffler and motorcycle that can regulate the low-frequency exhaust noise. At the same time, the exhaust volume and exhaust tone of the muffler can be changed according to the user's needs, to meet the driving needs in different application scenarios, improve the driving experience, and make the low-frequency tone differentiation more obvious. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a broadband low-frequency muffler and a motorcycle, which can change the exhaust volume and exhaust timbre of the muffler according to the user's usage requirements, meet the driving needs in different application scenarios, enhance the driving experience, and make the timbre differentiation of the low-frequency band more obvious.

[0005] The broadband low-frequency muffler of the present invention includes a muffler chamber surrounded by a shell, an input pipe is provided in communication with the left side of the muffler chamber, and a main exhaust pipe and a secondary exhaust pipe are provided in communication with the right side of the muffler chamber. The exhaust end of the secondary exhaust pipe is not in communication with the main exhaust pipe, and a control valve is provided between the main exhaust pipe and the muffler chamber. By setting the control valve, the opening or closing of the control valve is controlled to realize different exhaust paths, thereby realizing changes in the volume and timbre of the muffler to meet the different usage needs of drivers and passengers.

[0006] Furthermore, it also includes a partition, which is arranged in the silencer chamber and divides the silencer chamber into a first silencer chamber and a second silencer chamber. The input pipe passes through the first silencer chamber and the partition and is located in the second silencer chamber. By dividing the silencer chamber into two chambers, the difference in expansion ratio change of the engine exhaust under different exhaust paths can be achieved after entering the silencer chamber.

[0007] Furthermore, it also includes a connecting pipe, which is arranged on the partition and connected to the first muffler chamber and the second muffler chamber, so that the engine exhaust can enter the first muffler chamber from the second muffler chamber; the connecting pipe is arranged to facilitate the engine exhaust to enter the first muffler chamber.

[0008] Furthermore, the main exhaust pipe is connected to the first muffler chamber, and the auxiliary exhaust pipe is connected to the second muffler chamber; by connecting the main exhaust pipe and the auxiliary exhaust pipe to different muffler chambers, the difference in volume and tone of the muffler in the two modes can be further expanded.

[0009] Furthermore, the volume ratio of the second muffler chamber to the first muffler chamber is 1.2 to 1.6; when the control valve is closed, the allowable leakage of the valve plate of the control valve is 2% to 3%.

[0010] Furthermore, the relationship between the distance L1 from the end of the input pipe to the second muffler cavity and the length L2 of the second muffler cavity is: 0.8L2>L1>0.4L2.

[0011] Furthermore, the relationship between the distance L3 between the axis of the auxiliary exhaust pipe and the axis of the input pipe and the width L4 of the silencer chamber is: L3>0.7L4; by setting the distance between the auxiliary exhaust pipe and the input pipe, it is possible to extend the exhaust path in this state when the control valve is closed, thereby realizing the difference between the two modes when the control valve is opened, and expanding the difference in volume and timbre.

[0012] Furthermore, the ratio of the diameter of the input pipe to the diameter of the connecting pipe is 0.7 to 0.9; the relationship between the length L5 of the connecting pipe and its diameter D1 is L5 < 0.2D1. The input pipe is positioned above the muffler chamber, the main exhaust pipe is positioned below the muffler chamber, the connecting pipe is positioned between the input pipe and the main exhaust pipe, and the auxiliary exhaust pipe is positioned below the main exhaust pipe. Positioning the input pipe above the muffler chamber and the main and auxiliary exhaust pipes below the muffler chamber allows for different exhaust paths between the two muffler modes, which can help enhance the difference in volume and timbre between the two modes.

[0013] The utility model provides a motorcycle, which comprises the broadband low-frequency muffler.

[0014] Beneficial effects of the present invention: The broadband low-frequency muffler and motorcycle of the present invention can have a good muffler effect on low-frequency noise in a wider range, and can change the exhaust volume and exhaust timbre of the muffler according to the user's needs, meet the driving needs in different application scenarios, and enhance the driving experience. At the same time, it can make the low-frequency timbre difference more obvious when the control valve is open or closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 The timbre comparison of the control valve when it is open or closed;

[0018] The above drawings include the following reference numerals:

[0019] 1. Inlet pipe; 2. Shell; 201. First muffler chamber; 202. Second muffler chamber; 3. Auxiliary exhaust pipe; 4. Main exhaust pipe; 5. Connecting pipe; 6. Control valve. DETAILED DESCRIPTION

[0020] Figure 1 This is a schematic diagram of the structure of the utility model. Figure 2 The timbre comparison of the control valve when it is open or closed is shown below. Figure 1-2As shown: A variable-sound motorcycle of this embodiment includes a muffler chamber surrounded by a shell 2, an input pipe 1 is provided in communication with the left side of the muffler chamber, and a main exhaust pipe 4 and a sub-exhaust pipe 3 are provided in communication with the right side of the muffler chamber, the exhaust end of the sub-exhaust pipe 3 is not in communication with the main exhaust pipe 4, and a control valve 6 is provided between the main exhaust pipe 4 and the muffler chamber; in this structure, the left side and the right side are only used to distinguish that the input pipe 1 and the main exhaust pipe 4 and the sub-exhaust pipe 3 are located on different sides of the muffler chamber, and the gas discharged through the main exhaust pipe 4 and the sub-exhaust pipe 3 can flow into the next chamber or the atmospheric environment, and the switching of different exhaust paths of the muffler can be achieved by opening or closing the control valve 6. When the control valve 6 is opened, the exhaust gas of the engine will be reflected by the muffler chamber and discharged through the main exhaust pipe 4 and the sub-exhaust pipe 3. When the control valve 6 is closed, the exhaust gas of the engine will be reflected by the muffler chamber and discharged through the sub-exhaust pipe 3, thereby forming two muffler modes, which can achieve different changes in timbre and volume. At the same time, the change of timbre and volume can be achieved by controlling the opening of the control valve 6. The control valve 6 can be connected to the handlebar by a cable, and the opening or closing of the control valve 6 can be manually operated, or the opening or closing of the control valve 6 can be controlled by electric drive; the input pipe 1 is located at the upper left side of the silencer chamber, the main exhaust pipe 4 and the auxiliary exhaust pipe 3 are located at the lower right side of the silencer chamber, and the auxiliary exhaust pipe 3 is located below the main exhaust pipe 4, and the input pipe 1 and the auxiliary exhaust pipe 3 are kept at a certain distance. When the control valve 6 is closed, since the input pipe 1 and the auxiliary exhaust pipe 3 maintain a distance and have different positions and orientations, the reflection path of the engine exhaust in the silencer chamber can be extended, so that when the control valve 6 is opened or closed, the two exhaust paths have a large difference. At the same time, when the control valve 6 is opened, most of the airflow can be discharged through the main exhaust pipe 4, so that the mid- and low-frequency sounds are released, the acceleration sound burst is stronger, and the difference in volume and timbre of the two exhaust paths is further expanded.

[0021] In the existing technology, in order to output different exhaust sounds, the structure of the muffler can be designed to be variable to meet the sound needs of users in different scenarios; the current variable muffler mainly changes the volume by changing the flow cross-section of the exhaust channel, but the change in the timbre difference in the low-frequency band is not prominent; the broadband low-frequency muffler and motorcycle of the utility model can change the exhaust volume and exhaust timbre of the muffler according to the user's usage needs, meet the driving needs in different application scenarios, improve the driving experience, and at the same time make the low-frequency timbre difference more obvious when the control valve is open or closed.

[0022] In this embodiment, a partition is further included, which is arranged in the silencer chamber and divides the silencer chamber into a first silencer chamber 201 and a second silencer chamber 202. The input pipe 1 passes through the first silencer chamber 201 and the partition and is located in the second silencer chamber 202; the input pipe 1 passes through the first silencer chamber 201 and is located in the second silencer chamber 202, so that the exhaust of the engine can directly enter the second silencer chamber 202, so that when the control valve 6 is closed, the first silencer chamber 201 can serve as a resonance chamber. At the same time, when the engine is at medium and low speeds, the resistance of the engine's exhaust in the silencer chamber can be reduced, thereby adjusting the back pressure and reducing engine losses.

[0023] In this embodiment, a connecting pipe 5 is further included, which is arranged on the partition and connected to the first muffler chamber 201 and the second muffler chamber 202, so that the engine exhaust can enter the first muffler chamber 201 from the second muffler chamber 202; the connecting pipe 5 is arranged below the input pipe 1 and above the main exhaust pipe 4. The first muffler chamber 201 and the second muffler chamber 202 are connected through the input pipe 1, so that the connecting pipe 5 can become a resonant channel, which can further reduce medium and low frequency noise.

[0024] In this embodiment, the main exhaust pipe 4 is connected to the first muffler chamber 201, and the auxiliary exhaust pipe 3 is connected to the second muffler chamber 202; the main exhaust pipe 4 is connected to the first muffler chamber 201 through the partition, and the auxiliary exhaust pipe 3 is connected to the second muffler chamber 202, so that the exhaust paths of the two are different in different muffler modes, thereby achieving adjustment of volume and tone. At the same time, when the control valve 6 is closed, most of the engine exhaust can be discharged through the auxiliary exhaust pipe 3, reducing exhaust resistance and allowing the engine to have better performance output.

[0025] In this embodiment, the volume ratio of the second muffler chamber 202 and the first muffler chamber 201 is: 1.2~1.6; when the control valve is closed, the allowable leakage of the valve plate of the control valve is: 2%~3%; the volume of the second muffler chamber 202 is larger than the volume of the first muffler chamber 201, preferably, the volume of the second muffler chamber 202 is greater than 1.2 times the volume of the first muffler chamber 201 is greater than 6 times the displacement of the engine, the volumes of the first muffler chamber 201 and the second muffler chamber 202 are inconsistent, and in order to ensure the resonance effect of the first muffler chamber, the sealing requirements of the valve plate of the control valve are relatively high, and its leakage is required to not exceed 2-3%, so that the volume and timbre of the two are significantly different under different exhaust paths.

[0026] In this embodiment, the relationship between the distance L1 from the end of the input pipe 1 to the second muffler chamber 202 and the length L2 of the second muffler chamber 202 is: 0.8L2 > L1 > 0.4L2; the end of the input pipe 1 is the end closest to the second muffler chamber 202. In this embodiment, the relationship between the distance L3 between the axis of the auxiliary exhaust pipe 3 and the axis of the input pipe 1 and the width L4 of the muffler chamber is: L3 > 0.7L4. In this structure, a certain distance is maintained between the auxiliary exhaust pipe 3 and the input pipe 1. The larger the distance, the more airflow flows through the main exhaust pipe 4 when the control valve 6 is open, which can effectively eliminate low-frequency noise.

[0027] In this embodiment, the diameter ratio of the input pipe 1 to the connecting pipe 5 is 0.7 to 0.9; the relationship between the length L5 of the connecting pipe and the diameter D1 of the connecting pipe is L5 < 0.2D1; in this structure, by adjusting the relationship between the diameter of the input pipe and the diameter of the connecting pipe, and the relationship between the length of the connecting pipe and the diameter of the connecting pipe, the noise reduction effect on low-frequency noise can be improved, and the resonance effect of the connecting pipe 5 can be enhanced.

[0028] In this embodiment, the input pipe 1 is arranged at the upper position of the silencer chamber, the main exhaust pipe 4 is arranged at the lower position of the silencer chamber, the connecting pipe 5 is arranged between the input pipe 1 and the main exhaust pipe 4, and the auxiliary exhaust pipe 3 is arranged below the main exhaust pipe 4; by arranging the input pipe 1 at the upper position of the silencer chamber and the main exhaust pipe 4 and the auxiliary exhaust pipe 3 at the lower position of the silencer chamber, the exhaust paths in the two modes can be set when the control valve 6 is opened or closed, thereby improving the difference in the exhaust sound volume and timbre in the two modes.

[0029] The utility model provides a motorcycle, comprising the broadband low-frequency muffler; Figure 2 As shown in the figure, when the control valve is opened or closed, the sound characteristics in the frequency range below 500Hz are significantly weakened in both modes, achieving the purpose of adjusting the tone.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A broadband low-frequency muffler, characterized in that: It includes a silencer chamber surrounded by a shell, an input pipe is connected to the left side of the silencer chamber, a main exhaust pipe and a secondary exhaust pipe are connected to the right side of the silencer chamber, the exhaust end of the secondary exhaust pipe is not connected to the main exhaust pipe, and a control valve is provided between the main exhaust pipe and the silencer chamber.

2. The broadband low-frequency muffler according to claim 1, characterized in that: It also includes a partition plate, which is arranged in the muffler chamber and divides the muffler chamber into a first muffler chamber and a second muffler chamber. The input pipe passes through the first muffler chamber and the partition plate and is located in the second muffler chamber.

3. The broadband low-frequency muffler according to claim 2, characterized in that: It also includes a connecting pipe, which is arranged on the partition and connected to the first muffler chamber and the second muffler chamber, so that the engine exhaust can enter the first muffler chamber from the second muffler chamber.

4. The broadband low-frequency muffler according to claim 3, characterized in that: The main exhaust pipe is connected to the first muffler chamber, and the auxiliary exhaust pipe is connected to the second muffler chamber.

5. The broadband low-frequency muffler according to claim 2, characterized in that: The volume ratio of the second muffler chamber to the first muffler chamber is 1.2-1.6; when the control valve is closed, the allowable leakage of the valve plate of the control valve is 2%-3%.

6. The broadband low-frequency muffler according to claim 1, characterized in that: The relationship between the distance L1 from the end of the input pipe to the second muffler chamber and the length L2 of the second muffler chamber is: 0.8L2>L1>0.4L2.

7. The broadband low-frequency muffler according to claim 1, characterized in that: The relationship between the distance L3 between the axis of the auxiliary exhaust pipe and the axis of the inlet pipe and the width L4 of the muffler chamber is: L3>0.7L4.

8. The broadband low-frequency muffler according to claim 3, characterized in that: The ratio of the diameter of the input pipe to the diameter of the connecting pipe is 0.7-0.9; the relationship between the length L5 of the connecting pipe and the diameter D1 of the connecting pipe is L5<0.2D1.

9. The broadband low-frequency muffler according to claim 3, characterized in that: The input pipe is arranged at an upper position of the muffler chamber, the main exhaust pipe is arranged at a lower position of the muffler chamber, the connecting pipe is arranged between the input pipe and the main exhaust pipe, and the auxiliary exhaust pipe is arranged below the main exhaust pipe.

10. A motorcycle, characterized in that: A broadband low-frequency muffler comprising any one of claims 1 to 9.

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