CN218760075U

CN218760075U - Exhaust sound modulation device and vehicle

Info

Publication number: CN218760075U
Application number: CN202223214424.7U
Authority: CN
Inventors: 高宏亮
Original assignee: Jiangmen Dachangjiang Group Co Ltd
Current assignee: Jiangmen Dachangjiang Group Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-28
Anticipated expiration: 2032-11-30

Abstract

The utility model relates to an exhaust sound modulation device and vehicle, exhaust sound modulation device include first barrel, second barrel, intake pipe and blast pipe, and first barrel can be dismantled with the second barrel and be connected, and first barrel is equipped with first through-hole, and the second barrel has the second through-hole, and the diameter of first through-hole is greater than or is less than the diameter of second through-hole. The exhaust sound modulation device and the vehicle are used for modulating sound generated when gas vibrates during exhaust, and the sectional area of a channel through which sound waves pass when the sound waves are transmitted at various positions in the device is suddenly changed, so that reflection and interference of the sound waves are caused, and the noise elimination effect is realized. The first cylinder and the second cylinder which are different in length and aperture in replacement are detached, so that the sound output by the exhaust device can be modulated, the sound with different qualities is output under the condition that the appearance and the whole structure of the exhaust tuning device do not need to be changed, and meanwhile, the volume can be adjusted to meet the legal industrial noise requirement.

Description

Exhaust sound modulation device and vehicle

Technical Field

The utility model relates to a sound processing technology field especially relates to an exhaust sound modulation device and vehicle.

Background

When the engines of mechanical equipment such as motorcycles, automobiles and the like run, waste gas generated after the combustion of the engines flows out from the exhaust ports of the engines, the waste gas drives air to vibrate when flowing in the exhaust pipes, sound waves generated by air vibration are processed by the exhaust sound modulation device, however, the traditional sound modulation device is not convenient for modulating the sound waves into various tone qualities, and different requirements of customers on the tone qualities are difficult to satisfy.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an exhaust sound modulation device which is not convenient for modulating sound waves into a plurality of sound qualities.

The technical scheme is as follows:

the utility model provides an exhaust sound modulation device, exhaust sound modulation device includes first barrel, second barrel, intake pipe and blast pipe, first barrel is equipped with first through-hole, the second barrel with the connection can be dismantled to first barrel, the second barrel is equipped with the second through-hole, the diameter of first through-hole is greater than or is less than the diameter of second through-hole, the intake pipe with the connection can be dismantled to first barrel, the one end of intake pipe extends to in the first through-hole, the blast pipe with the connection can be dismantled to the second barrel, the one end of blast pipe extends to in the second through-hole.

The technical solution is further explained below:

in one embodiment, the exhaust sound modulation device comprises a shell, the shell is provided with a mounting cavity, and the first cylinder and the second cylinder are both arranged in the mounting cavity.

In one embodiment, the exhaust sound modulation device comprises a first partition plate and a second partition plate, the first partition plate and the second partition plate are arranged on one side of the shell close to the first barrel at intervals, the first partition plate and the second partition plate are connected with the shell, the first partition plate is provided with a first avoidance hole, the second partition plate is provided with a second avoidance hole, and the first barrel penetrates through the first avoidance hole and the second avoidance hole.

In one embodiment, the second avoiding hole is in a step shape, the end with the larger inner diameter of the second partition plate is connected with the larger outer diameter of the first cylinder and the second cylinder, and the end with the smaller inner diameter of the second partition plate is connected with the smaller outer diameter of the first cylinder and the second cylinder.

In one embodiment, the exhaust sound modulation device comprises a tail cover, the tail cover is arranged at one end, close to the second cylinder, of the shell and connected with the shell, and a third avoidance hole is formed in the tail cover to allow the exhaust pipe to penetrate through the third avoidance hole.

In one embodiment, the exhaust sound modulation device comprises a protective cover, one end of the protective cover is connected with the shell, the other end of the protective cover is used for being connected with an engine, and the protective cover is sleeved on the periphery of the air inlet pipe.

In one embodiment, the inner diameter of the boot tapers away from the first barrel.

In one embodiment, the exhaust sound modulation device comprises a third partition plate, the third partition plate is arranged at one end, close to the first barrel, of the protection cover and connected with the protection cover, and a fourth avoidance hole is formed in the third partition plate and used for the air inlet pipe to penetrate through.

In one embodiment, the length of the first cylinder is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated.

In one embodiment, the length of the second cylinder is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated.

In another aspect, a vehicle is provided that includes an engine and the exhaust sound modulation device, the engine coupled to the exhaust sound modulation device.

The sound that produces when above-mentioned exhaust sound modulation device and vehicle are used for modulating gas vibration when exhausting, and gas is discharged by the blast pipe behind intake pipe, first barrel and the second barrel, because the gas circulation is different in each aperture, the sound wave transmits first through-hole by the intake pipe, all can take place the sudden change by the cross sectional area of the passageway that first through-hole transmitted to second through-hole and transmitted to the blast pipe by the second through-hole to arouse the reflection of sound wave and interfere and realize noise cancelling effect. The first cylinder and the second cylinder which are different in length and aperture in replacement are detached to modulate sound output by the exhaust device, the whole sound volume of the sound during exhaust can be changed when the length of the first cylinder and the second cylinder is adjusted, the sound wave reflection characteristics of different frequencies can be adapted to when the aperture of the first cylinder and the aperture of the second cylinder are adjusted to eliminate sound of different frequencies, sound of different qualities is output under the condition that the appearance and the overall structure of the exhaust tuning device do not need to be changed, and meanwhile, the sound volume can be adjusted to meet the legal industrial noise requirement.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of an exhaust sound modulation apparatus according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the exhaust sound modulation device of FIG. 1;

FIG. 3 is a schematic view of another angle of the exhaust sound modulation device of FIG. 1;

FIG. 4 is a cross-sectional view of a prior art exhaust sound modulation device;

100. a first cylinder; 110. a second cylinder; 200. an air inlet pipe; 210. an exhaust pipe; 300. a housing; 400. a first separator; 410. a second separator; 420. a third separator; 500. a tail cover; 600. a protective cover.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As described in the background art, when an engine of a mechanical device such as a motorcycle or an automobile is operated, exhaust gas generated by combustion of the engine flows out from an exhaust port of the engine, the exhaust gas drives air to vibrate when flowing in an exhaust pipe, and sound waves generated by the air vibration are processed by an exhaust sound modulation device. In addition to meeting the power requirements of reducing exhaust back pressure and enabling smooth gas circulation, the conventional exhaust tuning device also needs to enable exhaust sound to meet the noise requirements specified by the national standard and the requirements of users on exhaust sound quality and listening feeling, such as heavy and deep exhaust sound. When the exhaust sound is modulated to meet the quality requirement of heavy feeling, the volume of the exhaust sound may exceed the legal noise standard; the exhaust sound quality is not heavy when the exhaust sound meets the legal noise standard, so that the quality requirement of the exhaust sound and the requirement of meeting the legal noise are contradictory. The conventional sound modulation device generally implements sound attenuation by means of designing a pipe with a variable aperture, inserting a sound attenuation pipe, designing a sound absorption cotton, and the like, and has a structure as shown in fig. 4. However, the existing sound modulation devices are not convenient to modulate sound waves into multiple sound qualities, and are difficult to meet different requirements of customers on the sound qualities under the legal noise requirements.

In order to solve the above problem, as shown in fig. 1 to 3, in one embodiment, an exhaust sound modulation device is provided, and includes a first cylinder 100, a second cylinder 110, an intake pipe 200, and an exhaust pipe 210, where the first cylinder 100 is provided with a first through hole, the second cylinder 110 is detachably connected to the first cylinder 100, the second cylinder 110 is provided with a second through hole, a diameter of the first through hole is greater than or less than a diameter of the second through hole, the intake pipe 200 is detachably connected to the first cylinder 100, one end of the intake pipe 200 extends into the first through hole, the exhaust pipe 210 is detachably connected to the second cylinder 110, and one end of the exhaust pipe 210 extends into the second through hole.

The exhaust sound modulation device is used for modulating sound generated when gas vibrates during exhaust, the gas is exhausted from the exhaust pipe 210 after passing through the air inlet pipe 200, the first cylinder 100 and the second cylinder 110, and sound waves are transmitted to the first through hole from the air inlet pipe 200, transmitted to the second through hole from the first through hole and transmitted to the exhaust pipe 210 from the second through hole due to different apertures at all positions of gas circulation, so that the cross-sectional areas of the channels passing through the sound waves are all subjected to sudden change, and the sound waves are reflected and interfered to achieve the noise elimination effect. The sound output by the exhaust device can be modulated by disassembling and replacing the first cylinder body 100 and the second cylinder body 110 with different lengths and apertures, the whole sound volume during exhaust can be changed when the lengths of the first cylinder body 100 and the second cylinder body 110 are adjusted, and the sound reflection characteristics of different frequencies can be adapted to eliminate the sound of different frequencies when the apertures of the first cylinder body 100 and the second cylinder body 110 are adjusted, so that the sound with different qualities can be output under the condition that the appearance and the whole structure of the exhaust tuning device are not required to be changed, and meanwhile, the sound volume can be adjusted to meet the legal industrial noise requirement. Specifically, the exhaust Sound Pressure Level (SPL) test of the exhaust sound output by the exhaust sound modulation device of the embodiment shows that the exhaust sound pressure of the exhaust sound obtained by modulation by the exhaust sound modulation device of the embodiment is significantly higher than that of the conventional design in the vicinity of the frequency of 120Hz, and the low-frequency sound can be effectively output, so that the sound quality requirements of users on the thick and heavy exhaust sound can be met.

As shown in fig. 2, in one embodiment, the exhaust sound modulation device includes a housing 300, the housing 300 is provided with a mounting cavity, and the first cylinder 100 and the second cylinder 110 are both provided in the mounting cavity. Therefore, the housing 300 can protect the first cylinder 100 and the second cylinder 110, so as to avoid the poor noise elimination effect of the device caused by collision, abrasion and other factors, and meanwhile, the sound waves penetrating through the first cylinder 100 and the second cylinder 110 are further reflected and interfered in the housing 300, so that the noise elimination effect of the device is improved.

As shown in fig. 2, in one embodiment, the exhaust sound modulation device includes a first partition board 400 and a second partition board 410, the first partition board 400 and the second partition board 410 are disposed at an interval on one side of the housing 300 close to the first barrel 100, and both the first partition board 400 and the second partition board 410 are connected to the housing 300, the first partition board 400 is provided with a first avoidance hole, the second partition board 410 is provided with a second avoidance hole, and the first barrel 100 passes through the first avoidance hole and the second avoidance hole. In this way, the first partition plate 400 and the second partition plate 410 can support the first cylinder 100, so that the first cylinder 100 is prevented from being worn by direct contact with the housing 300, and the service life of the device is prolonged.

The second avoiding hole may be formed in a stepped shape, one end of the second partition plate 410 having a larger outer diameter is connected to one of the first cylinder 100 and the second cylinder 110 having a larger outer diameter, and one end of the second partition plate 410 having a smaller outer diameter is connected to one of the first cylinder 100 and the second cylinder 110 having a smaller outer diameter, so that the first cylinder 100 and the second cylinder 110 may be stably connected. The connection mode of the first partition board 400 and the second partition board 410 with the housing 300 may be, but not limited to, sliding connection, interference fit connection, etc., and only the first through hole and the second through hole need to be connected.

As shown in fig. 2, in one embodiment, the exhaust sound modulation device includes a tail cover 500, the tail cover 500 is disposed at an end of the housing 300 close to the second cylinder 110 and connected to the housing 300, the tail cover 500 may be connected to the second cylinder 110, and the tail cover 500 is provided with a third relief hole for the exhaust pipe 210 to pass through. So, tail cover 500 can block the dust for second barrel 110, and the dust gets into the second through-hole and leads to noise cancelling effect not good when preventing to exhaust, and tail cover 500 can provide the support for second barrel 110 simultaneously, has avoided second barrel 110 and casing 300 direct contact to cause wearing and tearing.

The tail cover 500 may be provided with a step shape, the end of the tail cover 500 with a larger outer diameter is connected with the housing 300, and the end of the tail cover 500 with a smaller outer diameter is connected with the second cylinder 110. Thus, the tail cover 500 has a larger contact area with the second cylinder 110 and the housing 300, thereby ensuring that the tail cover 500 can be firmly mounted on the housing 300.

As shown in fig. 1 to 3, in one embodiment, the exhaust sound modulation device includes a protective cover 600, one end of the protective cover 600 is connected to the housing 300, the other end of the protective cover 600 is used for connecting to the engine, and the protective cover 600 is sleeved on the intake pipe 200. So, the safety cover 600 can protect the intake pipe 200, avoids the intake pipe 200 to drop because of the collision, and simultaneously, the sound wave that sees through intake pipe 200 further takes place to reflect and interfere in the safety cover 600 to noise cancelling effect has been improved.

Wherein the inner diameter of the protective cap 600 may be configured to gradually decrease in a direction away from the first cylinder 100. Since the diameter of the intake pipe 200 is smaller than the exhaust sound modulation device and the intake pipe 200 is generally bent, the inner diameter of the protective cover 600 is set to be gradually reduced in the axial direction at the end away from the first cylinder 100, so that the protective cover 600 can be more tightly fitted with the intake pipe 200 to prevent the protective cover 600 from falling off, and the overall volume of the device can be reduced.

Further, as shown in fig. 3, a groove may be further formed on the protective cover 600 to indicate a mounting angle of the protective cover 600, thereby facilitating the mounting of the protective cover 600 with the air inlet duct 200. In other embodiments, a protrusion, an angle indicator, etc. may be provided on the protection cover 600 to indicate the installation angle of the protection cover 600.

As shown in fig. 2, in one embodiment, the exhaust sound modulation device includes a third partition plate 420, the third partition plate 420 is disposed at an end of the protection cover 600 close to the first cylinder 100 and connected to the protection cover 600, and the third partition plate 420 is provided with a fourth avoidance hole for the air inlet pipe 200 to pass through. Thus, the third partition plate 420 can fix the installation angle of the air inlet pipe 200, so that the air inlet pipe 200 can stably convey air to the first cylinder 100, and the structure is more stable.

In one embodiment, the length of the first cylinder 100 is set to an odd multiple of a quarter wavelength of the acoustic wave to be cancelled. According to the principle of sound transmission, the single expansion pipe transmits sound loss

Where m is the expansion ratio (the ratio of the areas of the two sections before and after the course of the sound wave transmission), i.e. </or>

k is the number of waves,

wherein, omega is the angular frequency of the sound wave, lambda is the frequency of the sound wave, and c is the speed of light; l is the length of the tube, according to the above formula, when the length of the first cylinder 100 is set to an odd multiple of a quarter wavelength of the sound wave, i.e.

In the case where sin (kl) = ± 1, the value of the sound transmission loss TL is maximized only by the value of the expansion ratio m, and the device has the best sound wave silencing effect for the frequency corresponding to the wavelength. In other embodiments, the length of the first cylinder 100 can also be set to an even multiple of the wavelength of the sound wave to be retained, according to the above formula, when the length of the first cylinder 100 is set to an even multiple of a quarter of the wavelength of the sound wave, i.e. < >>

If sin (kl) =0, the value of the sound transmission loss TL is the minimum value, and if the sound wave silencing effect of the device for the frequency corresponding to the wavelength is the minimum, all the sound waves of the frequency corresponding to the wavelength pass through. Further, according to the above-mentioned formula of the sound transmission loss of the single expansion pipe, the expansion ratio between the first cylinder 100 and the second cylinder 110 can be changed by adjusting the diameters of the first cylinder 100 and the second cylinder 110, and the volume of the whole exhaust sound can be adjusted to meet the industrial noise requirement stipulated by law.

In another embodiment, the length of the second cylinder 110 is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated, and the sound transmission loss TL is maximized only according to the value of the expansion ratio m, so that the device has the best sound wave attenuation effect for the frequency corresponding to the wavelength.

In one embodiment, a vehicle is also provided, the vehicle comprising an engine and the exhaust sound modulation device of any of the above embodiments, the engine being connected to the exhaust sound modulation device.

The vehicle can reflect and interfere sound waves to achieve a noise elimination effect, and the sound output by the exhaust device can be modulated by disassembling and replacing the first cylinder 100 and the second cylinder 110 which have different lengths and different pore diameters, so that the sound with different qualities can be output without changing the appearance and the whole structure of the exhaust tuning device, and meanwhile, the volume can be adjusted to meet the legal industrial noise requirement.

It should be noted that the exhaust sound modulation device of the above embodiment can be used in a vehicle, but not limited to a vehicle, and can also be used in other mechanical equipment, such as an automobile, a construction machine, an industrial production line equipment, and the like, where exhaust sound volume needs to be controlled, and other occasions where use requirements are met.

The "certain body" and the "certain portion" may be a part corresponding to the "member", that is, the "certain body" and the "certain portion" may be integrally formed with the other part of the "member"; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain part" and "a certain part" in the present application are only one embodiment, and are not intended to limit the scope of the present application for reading convenience, and should be construed as equivalents of the present application as long as the features are included and the effects are the same.

It should be noted that, the components included in the "unit", "assembly", "mechanism" and "device" of the present application can also be flexibly combined, i.e., can be produced in a modularized manner according to actual needs, so as to facilitate the modularized assembly. The division of the above-mentioned components in the present application is only one example, which is convenient for reading and is not a limitation to the protection scope of the present application, and the same functions as the above-mentioned components should be understood as equivalent technical solutions in the present application.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The term "and/or" as used in this disclosure includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when an element is regarded as "fixed transmission connection" another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as socket joint, connection, integrally-formed fixation, welding and the like, which can be achieved in the prior art and are not described herein again. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An exhaust sound modulation device, characterized by comprising:

the first barrel is provided with a first through hole;

the second barrel is detachably connected with the first barrel, a second through hole communicated with the first through hole is formed in the second barrel, and the diameter of the first through hole is larger than or smaller than that of the second through hole; and

the air inlet pipe is detachably connected with the first barrel, one end of the air inlet pipe extends into the first through hole, the exhaust pipe is detachably connected with the second barrel, and one end of the exhaust pipe extends into the second through hole.

2. The exhaust sound modulation device according to claim 1, comprising a housing provided with a mounting cavity, wherein the first cylinder and the second cylinder are both provided in the mounting cavity.

3. The exhaust sound modulation device according to claim 2, comprising a first partition plate and a second partition plate, wherein the first partition plate and the second partition plate are disposed at a position on one side of the housing close to the first cylinder at intervals, and are connected to the housing, the first partition plate is provided with a first avoidance hole, the second partition plate is provided with a second avoidance hole, and the first cylinder passes through the first avoidance hole and the second avoidance hole.

4. The exhaust sound modulation device according to claim 3, wherein the second escape hole has a stepped shape, the end of the second partition plate having the larger inner diameter is connected to the one of the first cylinder and the second cylinder having the larger outer diameter, and the end of the second partition plate having the smaller inner diameter is connected to the one of the first cylinder and the second cylinder having the smaller outer diameter.

5. The exhaust sound modulation device according to claim 2, comprising a tail cover, wherein the tail cover is disposed at one end of the housing close to the second cylinder and connected to the housing, and the tail cover is provided with a third escape hole for the exhaust pipe to pass through.

6. The exhaust sound modulation device according to claim 2, comprising a protective cover, one end of the protective cover being connected to the housing, the other end of the protective cover being adapted to be connected to an engine, the protective cover being fitted over the intake pipe.

7. The exhaust sound modulation device according to claim 6, wherein an inner diameter of the boot gradually decreases in a direction away from the first cylinder.

8. The exhaust sound modulation device according to claim 6, comprising a third partition plate provided at an end of the protection cover close to the first cylinder and connected to the protection cover, the third partition plate being provided with a fourth escape hole for the intake pipe to pass through.

9. The exhaust sound modulation device according to claim 1, wherein the length of the first cylinder is set to an odd multiple of a quarter wavelength of the sound wave to be cancelled; and/or the length of the second cylinder is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated.

10. A vehicle characterized by comprising an engine and the exhaust sound modulation device according to any one of claims 1 to 9, the engine being connected to the exhaust sound modulation device.