Exhaust muffler for internal combustion engine

Abstract

The present invention relates to an exhaust muffler for an internal combustion engine used in a vehicle. The exhaust muffler controls the quality of exhaust noise without significantly increasing the size of the exhaust muffler. In addition, the exhaust muffler increases exhaust noise (a roar effect is generated) without significantly increasing the size of the exhaust muffler.

Description

Technical Field

[0001] The present invention relates to an exhaust muffler for an internal combustion engine used in a vehicle. Background Art

[0002] An exhaust muffler is a device for reducing exhaust noise of exhaust gas exhausted by a vehicle by reducing the temperature and pressure of the exhaust gas. Typically, the exhaust muffler defines an internal space that is divided into a plurality of chambers by one or more dividers to increase the reduction effect.

[0003] However, in some cases, it is necessary to provide an exhaust muffler to control the quality of the exhaust noise (which depends on engine factors such as engine capacity, engine speed, etc.). In particular, it is necessary to control the quality of the exhaust noise without significantly affecting the performance of the engine and the size of the exhaust muffler.

[0004] In addition, in some cases, it is desirable to provide an exhaust muffler that increases exhaust noise to provide a unique sound effect (produces a roar effect). In particular, it is desirable to increase the intensity of the unique sound without significantly affecting the performance of the engine and the size of the exhaust muffler. Summary of the invention

[0005] This summary is intended to introduce some concepts in a simplified form that are further described in the detailed description below. This summary is not intended to identify key or essential features.

[0006] In one aspect of the present invention, there is provided an exhaust muffler for a vehicle, the exhaust muffler comprising: an outer wall, a first end wall and a second end wall defining an internal space; at least a first separator, the first separator being located between the first end wall and the second end wall, thereby dividing the internal space into at least a first chamber and a second chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing the exhaust gas from the second chamber into the environment; at least a first inter-chamber communicating pipe, the first inter-chamber communicating pipe conveying a first portion of the exhaust gas from the first chamber to the second chamber; and an orifice portion, the orifice portion being arranged in the first separator for conveying a second portion of the exhaust gas from the first chamber to the second chamber.

[0007] In an embodiment of the present invention, the exhaust muffler is a two-chamber exhaust muffler. In another embodiment of the present invention, a first portion of the exhaust gas from the first inter-chamber communication duct is mixed with a second portion of the exhaust gas from the orifice portion provided in the first divider in the mixing zone.

[0008] In yet another embodiment of the invention, at least one property selected from wavelength, loudness and speed of the sound waves generated by the exhaust gas is altered in the mixing zone.In a further embodiment of the invention, the mixing zone is located between the inlet duct and the entry portion of the outlet duct.

[0009] In further embodiments of the invention, the mixing zone is located within the second chamber and is defined between the orifice and the entry portion of the outlet duct.In further embodiments of the invention, the mixing zone is located within the second chamber and is located within a predetermined distance L from the entry portion of the outlet duct.

[0010] In an embodiment of the invention, the mixing zone is located within the second chamber and within a predetermined radial distance R from the axis of the outlet duct.

[0011] In another embodiment of the invention, the inlet portion of the outlet duct is positioned relative to the outlet portion of the first inter-chamber communication duct so that the first portion of the exhaust gas takes a tortuous path between the inlet portion of the outlet duct and the outlet portion of the first inter-chamber communication duct.

[0012] In yet another embodiment of the present invention, the tortuous path comprises at least one bend.

[0013] In another embodiment of the present invention, the exhaust gas undergoes expansion in the first chamber before reaching the inlet portion of the first inter-chamber connecting pipe and / or the orifice portion located in the first divider; and the exhaust gas undergoes expansion and compression in the second chamber before reaching the inlet portion of the outlet pipe.

[0014] In another embodiment of the present invention, the outlet pipe includes a perforated portion, so that the first part of the exhaust gas is divided into a third part of the exhaust gas and a fourth part of the exhaust gas; the second part of the exhaust gas is mixed with the third part of the exhaust gas in the mixing zone and enters the outlet pipe through the entry portion, and the fourth part of the exhaust gas enters the outlet pipe through the perforated portion.

[0015] In another aspect of the present invention, a saddle-type vehicle is provided, comprising: a single-cylinder engine unit that discharges exhaust gas; and an exhaust muffler attached to the engine. In an embodiment of the present invention, the exhaust muffler comprises: an outer wall, a first end wall, and a second end wall defining an internal space; at least a first separator, the first separator being located between the first end wall and the second end wall, thereby dividing the internal space into at least a first chamber and a second chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing exhaust gas from the second chamber into the environment; at least a first inter-chamber communication pipe, the first inter-chamber communication pipe conveying a first portion of the exhaust gas from the first chamber to the second chamber; and an orifice portion, the orifice portion being arranged in the first separator for conveying a second portion of the exhaust gas from the first chamber to the second chamber.

[0016] In another aspect of the present invention, there is provided an exhaust muffler for a vehicle, which is a three-chamber type muffler pipe and includes: an outer wall, a first end wall and a second end wall defining an internal space; a first separator and a second separator, the first separator and the second separator being located between the first end wall and the second end wall to divide the internal space into a first chamber, a second chamber and a third chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing the exhaust gas from the second chamber into the environment; a first inter-chamber communicating pipe, the first inter-chamber communicating pipe conveying a first portion of the exhaust gas from the first chamber to the third chamber; a second inter-chamber communicating pipe, the second inter-chamber communicating pipe conveying a first portion of the exhaust gas from the third chamber to the second chamber; and an orifice portion, the orifice portion being arranged in the first separator for conveying a second portion of the exhaust gas from the first chamber to the second chamber.

[0017] In an embodiment of the present invention, a first portion of the exhaust gas from the second inter-chamber communicating conduit is mixed with a second portion of the exhaust gas from the orifice portion in a mixing zone; and at least one characteristic selected from wavelength, loudness and speed of the sound waves generated by the exhaust gas is changed in the mixing zone.

[0018] In another embodiment of the invention, a mixing zone is located within the second chamber and is defined between the orifice and the inlet portion of the outlet conduit.

[0019] In another embodiment of the present invention, the second inter-chamber communication conduit includes an inlet portion, and the inlet portion of the second inter-chamber communication conduit is positioned relative to the outlet portion of the first inter-chamber communication conduit so that: a first portion of the exhaust gas takes a first curved path between the inlet portion of the second inter-chamber communication conduit and the outlet portion of the first inter-chamber communication conduit. In another embodiment of the present invention, the inlet portion of the outlet conduit is positioned relative to the outlet portion of the second inter-chamber communication conduit so that: the first portion of the exhaust gas takes a second curved path between the inlet portion of the outlet conduit and the outlet portion of the second inter-chamber communication conduit.

[0020] In a further embodiment of the invention, the first curved path comprises at least one bend. In a further embodiment of the invention, the second curved path comprises at least one bend.

[0021] In an embodiment of the present invention, the exhaust gas undergoes expansion in the first chamber before reaching the entrance portion of the first inter-chamber communicating conduit and / or the orifice portion located in the first divider; and the exhaust gas undergoes expansion and compression in the third chamber before reaching the entrance portion of the second inter-chamber communicating conduit; and the exhaust gas undergoes expansion and compression in the second chamber before reaching the entrance portion of the outlet conduit.

[0022] In another embodiment of the invention, the outlet conduit for removing exhaust gas from the second chamber comprises a perforated portion. In yet another embodiment of the invention, the outlet conduit located in the third chamber comprises a perforated portion.

[0023] In yet another embodiment of the invention, the outlet conduit located in the second chamber comprises a perforated portion. In a further embodiment of the invention, the orifice portion and the inlet portion of the outlet conduit overlap each other relative to the axis of the outlet conduit. In a further embodiment of the invention, the orifice portion and the inlet portion of the outlet conduit overlap at least 20% relative to the axis of the outlet conduit.

[0024] In another aspect of the present invention, a saddle-type vehicle is provided, comprising: a single-cylinder engine unit that discharges exhaust gas; and an exhaust muffler attached to the engine. In an embodiment of the present invention, the exhaust muffler comprises: an outer wall, a first end wall, and a second end wall that define an internal space; a first separator and a second separator, the first separator and the second separator being located between the first end wall and the second end wall, thereby dividing the internal space into a first chamber, a second chamber, and a third chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing exhaust gas from the second chamber into the environment; a first inter-chamber communication pipe, the first inter-chamber communication pipe conveying a first portion of the exhaust gas from the first chamber to the third chamber; a second inter-chamber communication pipe, the second inter-chamber communication pipe conveying a first portion of the exhaust gas from the third chamber to the second chamber; and an orifice portion, the orifice portion being arranged in the first separator for conveying a second portion of the exhaust gas from the first chamber to the second chamber.

[0025] In another aspect of the present invention, there is provided an exhaust muffler for a vehicle, the exhaust muffler comprising: an outer wall, a first end wall and a second end wall defining an internal space; at least a first separator, the first separator being located between the first end wall and the second end wall, thereby dividing the internal space into at least a first chamber and a second chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing the exhaust gas from the second chamber into the environment, the outlet pipe comprising an inlet port and a perforation portion for allowing the exhaust gas to enter the outlet pipe from the second chamber; and at least a first inter-chamber communicating pipe, the first inter-chamber communicating pipe conveying the exhaust gas from the first chamber to the second chamber, the first inter-chamber communicating pipe comprising a first exhaust portion, thereby allowing the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communicating pipe.

[0026] In an embodiment of the present invention, the exhaust muffler is at least one of a two-chamber exhaust muffler and a three-chamber exhaust muffler.

[0027] In another embodiment of the present invention, a three-chamber exhaust muffler includes: a first separator and a second separator, the first separator and the second separator are located between the first end wall and the second end wall, thereby dividing the internal space into a first chamber, a second chamber and a third chamber; a first inter-chamber connecting pipe, the first inter-chamber connecting pipe transfers the exhaust gas from the first chamber to the third chamber; a second inter-chamber connecting pipe, the second inter-chamber connecting pipe transfers the exhaust gas from the third chamber to the second chamber.

[0028] In one or more embodiments of the present invention, the first inter-chamber communication conduit includes a first discharge portion to allow exhaust gas to be discharged in a direction parallel to an axis of the first inter-chamber communication conduit.

[0029] In still another embodiment of the present invention, the second inter-chamber communication conduit includes a second discharge portion to allow the exhaust gas to be discharged in a direction parallel to the axis of the second inter-chamber communication conduit.

[0030] In another aspect of the present invention, a saddle-type vehicle is provided, comprising: a single-cylinder engine unit that discharges exhaust gas; and an exhaust muffler attached to the engine; the exhaust muffler comprises: an outer wall, a first end wall, and a second end wall that define an internal space; at least a first divider, the first divider being located between the first end wall and the second end wall, thereby dividing the internal space into at least a first chamber and a second chamber; an inlet pipe for introducing exhaust gas into the first chamber; an outlet pipe for releasing the exhaust gas from the second chamber into the environment, the outlet pipe comprising an inlet port and a perforation portion for allowing the exhaust gas to enter the outlet pipe from the second chamber; and at least a first inter-chamber communicating pipe, the first inter-chamber communicating pipe conveying the exhaust gas from the first chamber to the second chamber, the first inter-chamber communicating pipe comprising a first discharge portion, thereby allowing the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communicating pipe.

[0031] An advantage of the present invention is that the exhaust muffler increases the exhaust noise, thereby providing a unique sound effect. In particular, the exhaust muffler produces a roaring sound effect. Another advantage of the present invention is that the exhaust muffler does not significantly affect the performance of the engine. Another advantage of the present invention is that the size of the exhaust muffler is not increased to produce the roaring sound effect. Another advantage of the present invention is that no additional parts are used to construct the exhaust muffler. Another advantage of the present invention is that the time required to manufacture the exhaust muffler is relatively short. Another advantage of the present invention is that the cost of the exhaust muffler is relatively low.

[0032] In order to further illustrate the advantages and features of the present invention, the present invention will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. It should be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be construed as limiting the scope of the present invention. The present invention will be described and illustrated in more detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the present invention easier to understand and put into practice, reference will now be made to the exemplary embodiments shown in the accompanying drawings, wherein the same reference numerals represent the same or functionally similar elements in the various views. The accompanying drawings, together with the following detailed description, are incorporated into and constitute a part of the specification, and are used to further illustrate the embodiments and explain various principles and advantages according to the present invention, wherein:

[0034] Figure 1 shows a side view of an exemplary two-wheeled vehicle according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram showing a two-chamber exhaust muffler constructed according to a first embodiment of the present invention;

[0036] Figure 3 A schematic diagram showing a two-chamber exhaust muffler constructed according to a second embodiment of the present invention;

[0037] Figure 4 shows a schematic diagram of a three-chamber exhaust muffler constructed according to a third embodiment of the present invention;

[0038] Figure 5 A schematic diagram showing a three-chamber exhaust muffler constructed according to a fourth embodiment of the present invention;

[0039] Figure 6 A schematic diagram showing a two-chamber exhaust muffler constructed in accordance with a fifth embodiment of the present invention;

[0040] Figure 7 A schematic diagram showing a three-chamber exhaust muffler constructed according to a sixth embodiment of the present invention; and

[0041] Figure 8 A graph showing the change in pressure of exhaust gas exhausted from the exhaust muffler constructed according to the first embodiment of the present invention over time is shown.

[0042] It may be noted that, to the extent possible, the same reference numerals are used in the drawings to represent the same elements. In addition, it will be appreciated by those skilled in the art that the elements in the drawings are shown for simplicity and may not necessarily be drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help improve understanding of various aspects of the present invention. In addition, one or more elements may have been represented in the drawings by conventional symbols, and only those specific details relevant to understanding the embodiments of the present invention may be shown in the drawings to avoid obscuring the details in the drawings, which will be readily apparent to those skilled in the art from the description herein. DETAILED DESCRIPTION

[0043] In order to facilitate an understanding of the principles of the invention, reference will now be made to the embodiments shown in the drawings and specific language will be used to describe the embodiments. However, it should be understood that this is not meant to limit the scope of the invention and that those skilled in the art to which the invention relates will generally appreciate changes and further modifications to the illustrated apparatus and further applications of the principles of the invention illustrated therein.

[0044] Those skilled in the art will appreciate that the foregoing general description and the following detailed description are illustrative of the present invention and are not intended to limit the present invention. As used herein and throughout the appended claims, the meanings of "a", "an", and "the" include plural references unless the context clearly dictates otherwise. In addition, as used herein, the meaning of "in" includes "in" and "on", unless the context clearly dictates otherwise.

[0045] References to "on one hand," "on the other hand," or similar language in this specification mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "in an embodiment," "in another embodiment," and similar language appearing in this specification may, but do not necessarily, all refer to the same embodiment.

[0046] The terms "include", "comprising" or any other variations thereof are intended to cover a non-exclusive inclusion, such that one or more devices or subsystems or elements or structures or parts beginning with "include..." do not exclude the presence of other devices or other subsystems or other elements or other structures or other parts or additional devices or additional subsystems or additional elements or additional structures or additional parts without more constraints.

[0047] As used herein, unless the context dictates otherwise, the terms "coupled to," "connected to," "operably connected to," and "operably connected to" are intended to include both direct connections / connections (where two elements being coupled / connected are in contact with each other) and indirect connections / connections (where at least one additional element is located between the two elements). Thus, the terms "coupled to" and "coupled with" are used synonymously. Similarly, the terms "connected to" and "connected with" are used synonymously.

[0048] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.The devices, methods, and examples provided herein are illustrative only and are not intended to be limiting.

[0049] The use of any and all examples or exemplary language (e.g., "for example") provided herein for certain embodiments is intended only to better illustrate the present invention and is not intended to limit the scope of the present invention. No language in the specification should be construed as indicating that any unmentioned element is essential to the practice of the present invention.

[0050] The grouping of alternative elements or embodiments of the present invention disclosed herein should not be construed as limiting. The members of each group may be cited and protected individually, or may be cited and protected in any combination with other members in the group or other elements found herein. For reasons of convenience and / or patentability, one or more members in the group may be included in the group or deleted therefrom. When any such addition or deletion occurs, this specification is deemed to include the modified group, thereby satisfying the written description of all used Markush groups.

[0051] Although the present invention is described in the context of a vehicle, the scope of the present invention and its aspects and features may also be applied to other types of vehicles. Throughout the description, the terms "vehicle", "two-wheeled vehicle" and "motorcycle" are used interchangeably in the description. The term "vehicle" includes vehicles such as motorcycles, scooters, bicycles, mopeds, scooter-type vehicles, all-terrain vehicles (ATVs), etc.

[0052] The terms "front / forward", "back / backward / back", "up / above / top", "down / below / downward / downward, bottom", "left / to the left", and "right / right" used in this document indicate directions from the perspective of a straddled vehicle driver, and these directions are represented by arrows Fr, Rr, U, Lr, L, and R in the figure.

[0053] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] Reference Figure 1 , shows a side view of a two-wheeled vehicle 10 according to an embodiment of the present invention. The vehicle 10 particularly includes a front fork 12, a head pipe 14, a front fender 16, a front wheel 18, a headlight 20, a steering handlebar 22, a fuel tank 24, an engine unit 26, a rear wheel 28, a rear fender 30, a taillight 32, a seat 34, a tool box 36, a frame 38 and an exhaust muffler 100. It may be noted that the vehicle 10 is shown to include the above-mentioned components, however, it will be understood by those skilled in the art that the vehicle 10 includes other components that may not be relevant to the description of the present invention and therefore are not shown and described.

[0055] Reference Figure 2, shows a schematic diagram of a two-chamber exhaust muffler 100 constructed according to a first embodiment of the present invention. The two-chamber exhaust muffler 100 includes an outer wall 102, a first end wall 104, and a second end wall 106. The outer wall 102, the first end wall 104, and the second end wall 106 define an internal space of the two-chamber exhaust muffler 100. In addition, at least a first divider 108 is located between the first end wall 104 and the second end wall 106, thereby dividing the internal space into at least a first chamber 110 and a second chamber 112.

[0056] The two-chamber exhaust muffler 100 includes an inlet pipe 114 for introducing exhaust gas from the engine unit 26 of the vehicle 10 into the first chamber 110. In addition, an outlet pipe 116 is provided in the two-chamber exhaust muffler 100 for discharging exhaust gas from the second chamber 112 into the environment. In addition, the two-chamber exhaust muffler 100 includes at least a first inter-chamber communication pipe 118 for transferring a first portion of the exhaust gas from the first chamber 110 to the second chamber 112. In an embodiment of the present invention, an orifice portion 120 is provided in the first divider 108 for transferring a second portion of the exhaust gas from the first chamber 110 to the second chamber 112.

[0057] In another embodiment of the present invention, a first portion of the exhaust gas from the first inter-chamber communication duct 118 is mixed with a second portion of the exhaust gas from the orifice portion 120 provided in the first divider 108 in a mixing zone 122. In an embodiment of the present invention, the position of the mixing zone 122 varies within the internal space of the two-chamber exhaust muffler 100. As a non-limiting example, the mixing zone 122 is located between the inlet duct 114 and the inlet portion 124 of the outlet duct 116. As another non-limiting example, the mixing zone 122 is located within the second chamber 112 and is defined between the orifice portion 120 and the inlet portion 124 of the outlet duct 116.

[0058] Turning now to the position of the outlet conduit 116, as a non-limiting example, the inlet portion 124 of the outlet conduit 116 is positioned relative to the outlet portion 128 of the first inter-chamber communication conduit 118 such that the first portion of the exhaust gas takes a tortuous path 130 between the inlet portion 124 of the outlet conduit 116 and the outlet portion 128 of the first inter-chamber communication conduit 118. In another embodiment of the present invention, the tortuous path 130 includes at least one bend.

[0059] Turning now to the configuration of the first inter-chamber communication duct 118, in an embodiment of the present invention, the first inter-chamber communication duct 118 includes an inlet portion 132 located at a proximal portion and an outlet portion 128 located at approximately a distal portion. As a non-limiting example, the outlet portion 128 allows exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication duct 118. For example, the distal portion of the first inter-chamber communication duct 118 can be opened and used as the outlet portion 128.

[0060] Although not shown, as another non-limiting example, the exhaust portion 128 allows exhaust gas to be exhausted in a direction perpendicular to the axis of the first inter-chamber communication duct 118. For example, the circumferential wall of the first inter-chamber communication duct 118 near the distal end portion may include at least one perforated portion serving as the exhaust portion 128.

[0061] about Figure 2 As shown in the function of the exhaust muffler 100, in the embodiment of the present invention, the exhaust gas undergoes expansion in the first chamber 110 before reaching the inlet portion 132 of the first inter-chamber communication duct 118 and the orifice portion 120 in the first divider 108. In the embodiment of the present invention, since the exhaust gas undergoes expansion in the first chamber 110 and only the first part of the exhaust gas is transported by the inter-chamber communication duct 118, a first-order noise damping effect is obtained in the first chamber 110. The first part of the exhaust gas undergoes expansion and compression when reaching the second chamber 112 before reaching the inlet portion 124 of the outlet duct 116. Therefore, a second-order noise damping effect is obtained in the second chamber 112.

[0062] Now, after the second-stage noise damping effect is achieved, at least one characteristic selected from the group consisting of wavelength, loudness, and speed of the sound waves generated by the exhaust gas is changed. The change in at least one characteristic of the sound waves generated by the exhaust gas is believed to be caused by the mixing of the first part of the exhaust gas with the second part of the exhaust gas in the mixing zone 122. Therefore, the characteristics of the sound waves generated by the exhaust gas discharged from the exhaust muffler can be controlled by the nature of the mixing of the first part of the exhaust gas with the second part of the exhaust gas in the mixing zone 122 and the position of the mixing zone 122.

[0063] The nature of the mixing of the first portion of the exhaust gas with the second portion of the exhaust gas can be controlled by controlling the size and shape of the orifice 120 disposed in the first divider 108. As a non-limiting example, the size of the orifice 120 disposed in the first divider 108 is in the range of 25% to 47% of the size of the inlet port 124 of the outlet pipe 116. As another non-limiting example, the orifice 120 disposed in the first divider 108 can have a shape selected from a circular shape, an oval shape, a square shape, a pentagonal shape, a hexagonal shape, a heptagonal shape, an octagonal shape, a nonadecagonal shape, a decagonal shape, and the like.

[0064] Turning now to the position of the mixing zone 122, as a non-limiting example, the mixing zone 122 can be located within a predetermined distance L from the entrance portion 124 of the outlet pipe 116. As another non-limiting example, the mixing zone 122 can be located within a predetermined radial distance R from the axis 126 of the outlet pipe 116. As another non-limiting example, the position of the mixing zone 122 can be easily controlled by controlling the position of the orifice 120 formed in the first divider 108. As a non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap by at least 20%. As another non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap each other relative to the axis 126 of the outlet pipe 116. As another non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap by at least 20% relative to the axis 126 of the outlet pipe 116.

[0065] Now refer to Figure 8, a graph showing the change of the exhaust gas pressure discharged from the exhaust muffler constructed according to the first embodiment of the present invention over time and the change of the exhaust gas pressure discharged from the exhaust muffler without the orifice portion in the first divider over time. In particular, it can be seen that the exhaust gas discharged from the exhaust muffler without the orifice portion in the first divider has a pressure change as shown in the first curve 202, while the exhaust gas discharged from the exhaust muffler constructed according to the first embodiment of the present invention has a pressure change as shown in the second curve 204. The peak in the second curve 204 is higher than the peak in the first curve 202, and therefore, the amplitude of the exhaust gas discharged from the exhaust muffler constructed according to the first embodiment of the present invention is higher than the amplitude of the exhaust gas discharged from the exhaust muffler without the orifice portion in the divider. In addition, the frequency of the exhaust gas discharged from the exhaust muffler constructed according to the first embodiment of the present invention is different from the frequency of the exhaust gas discharged from the exhaust muffler without the orifice portion in the divider. Therefore, compared with the exhaust gas discharged from the exhaust muffler without the orifice portion in the divider, the exhaust gas discharged from the exhaust muffler constructed according to the first embodiment of the present invention has a roaring effect.

[0066] Reference Figure 3 , shows a two-chamber exhaust muffler 100 constructed according to a second embodiment of the present invention. The construction of the two-chamber exhaust muffler 100 according to the second embodiment is substantially similar to that of the two-chamber exhaust muffler 100 according to the first embodiment, except for the construction of the outlet pipe 116 for removing the exhaust gas from the second chamber 112. Therefore, the construction of the two-chamber exhaust muffler according to the first embodiment (such as Figure 2 and as described above) and the structure of the two-chamber exhaust muffler according to the second embodiment (as Figure 3 The difference between

[0067] In the two-chamber type exhaust muffler 100 according to the first embodiment, although the outlet pipe 116 for removing the exhaust gas from the second chamber 112 is solid, the outlet pipe 116 for removing the exhaust gas from the second chamber 112 according to the second embodiment is partially perforated. In particular, a portion of the outlet pipe 116 located in the second chamber 112 includes a perforated portion 134.

[0068] Although in Figure 2 In the exhaust muffler shown and described above in the first embodiment, a first portion of the exhaust gas from the entire inter-chamber communication conduit 118 reaches the mixing zone 122, but Figure 3In the exhaust muffler shown, the first part of the exhaust gas from the inter-chamber communication duct 118 does not reach the mixing zone 122 in its entirety. Instead, only a sub-portion of the first part of the exhaust gas from the inter-chamber communication duct 118, hereinafter referred to as the third part of the exhaust gas, reaches the mixing zone 122, and the remaining sub-portion, hereinafter referred to as the fourth part, avoids the mixing zone 122 and directly enters the outlet duct 116 via the perforated portion 134 provided on the outlet duct 116. Therefore, according to the second embodiment, in the mixing zone 122, the second part of the exhaust gas is mixed with the third part of the exhaust gas and enters the outlet duct 116 via the entry portion 124. The fourth part of the exhaust gas is then mixed in the outlet duct 116 (with the second and third parts of the exhaust gas). Due to the above reasons, an increase in exhaust noise is observed compared to the first embodiment. In addition, the exhaust gas discharged from the exhaust muffler constructed according to the second embodiment of the present invention has a roaring effect compared to the exhaust gas discharged from the exhaust muffler without an orifice portion in the divider.

[0069] Reference Figure 4 , shows a schematic diagram of a three-chamber exhaust muffler 100 constructed according to a third embodiment of the present invention. The three-chamber exhaust muffler 100 includes an outer wall 102, a first end wall 104, and a second end wall 106. The outer wall 102, the first end wall 104, and the second end wall 106 interact with each other to form an internal space. The three-chamber exhaust muffler 100 includes a first divider 108 and a second divider 136, which are located between the first end wall 104 and the second end wall 106 to divide the internal space into a first chamber 110, a second chamber 112, and a third chamber 138.

[0070] In addition, the three-chamber type exhaust muffler 100 includes an inlet pipe 114 for introducing exhaust gas into the first chamber 110 and an outlet pipe 116 for removing exhaust gas from the second chamber 112. The three-chamber type exhaust muffler 100 includes a first inter-chamber communication pipe 118 that transmits a first portion of the exhaust gas from the first chamber 110 to the third chamber 138. In an embodiment of the present invention, the first inter-chamber communication pipe 118 passes through the first divider 108 and the second divider 136. The three-chamber type exhaust muffler 100 includes a second inter-chamber communication pipe 140 that transmits a first portion of the exhaust gas from the third chamber 138 to the second chamber 112.

[0071] Furthermore, the first divider 108 is provided with an orifice portion 120 for conveying a second portion of the exhaust gas from the first chamber 110 to the second chamber 112 .

[0072] In another embodiment of the present invention, a first portion of the exhaust gas from the second inter-chamber communication duct 140 is mixed with a second portion of the exhaust gas from the orifice portion 120 provided in the first divider 108 in the mixing zone 122. In an embodiment of the present invention, the position of the mixing zone 122 varies within the internal space of the three-chamber exhaust muffler 100. As a non-limiting example, the mixing zone 122 is located between the inlet duct 114 and the entrance portion 124 of the outlet duct 116. As another non-limiting example, the mixing zone 122 is located within the second chamber 112 and is defined between the orifice portion 120 and the entrance portion 124 of the outlet duct 116.

[0073] Turning now to the construction of the first inter-chamber communication duct 118, in an embodiment of the present invention, the first inter-chamber communication duct 118 includes an inlet portion 132 located at a proximal portion and an outlet portion 128 located approximately at a distal portion. As a non-limiting example, the outlet portion 128 allows exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication duct 118. For example, the distal portion of the first inter-chamber communication duct 118 can be opened and used as the outlet portion 128. Although not shown, as another non-limiting example, the outlet portion 128 allows exhaust gas to be discharged in a direction perpendicular to the axis of the first inter-chamber communication duct 118. For example, the circumferential wall of the first inter-chamber communication duct 118 near the distal portion may include at least one perforated portion used as the outlet portion 128.

[0074] Turning now to the configuration of the second inter-chamber communication duct 140, in an embodiment of the present invention, the second inter-chamber communication duct 140 includes an inlet portion 142 located at a distal portion and an outlet portion 144 located approximately at a proximal portion. As a non-limiting example, the outlet portion 144 allows a first portion of the exhaust gas to be discharged in a direction parallel to the axis of the second inter-chamber communication duct 140. For example, the distal portion of the second inter-chamber communication duct 140 may be opened and used as the outlet portion 144. Although not shown, as another non-limiting example, the outlet portion 144 of the second inter-chamber communication duct 140 allows a first portion of the exhaust gas to be discharged in a direction perpendicular to the axis of the second inter-chamber communication duct 140. For example, the circumferential wall of the second inter-chamber communication duct 140 near the proximal portion may include at least one perforated portion used as the outlet portion 144.

[0075] In an embodiment of the present invention, the second inter-chamber communication duct 140 includes an inlet portion 142, which is positioned relative to the outlet portion 128 of the first inter-chamber communication duct 118 so that the first portion of the exhaust gas takes a first tortuous path 130 between the inlet portion 142 and the outlet portion 128 of the first inter-chamber communication duct 118. In an embodiment of the present invention, the first tortuous path 130 includes at least one bend. In an embodiment of the present invention, the inlet portion 124 of the outlet duct 116 is positioned relative to the outlet portion 144 of the second inter-chamber communication duct 140 so that the first portion of the exhaust gas takes a second tortuous path 146 between the inlet portion 124 of the outlet duct 116 and the outlet portion 144 of the second inter-chamber communication duct 140. In an embodiment of the present invention, the second tortuous path 146 includes at least one bend.

[0076] about Figure 4 The function of the exhaust muffler 100 shown, in the embodiment of the present invention, the exhaust gas undergoes expansion in the first chamber 110 before reaching the inlet portion 132 of the first inter-chamber communication duct 118 and the orifice portion 120 in the first divider 108. In the embodiment of the present invention, since the exhaust gas undergoes expansion in the first chamber 110, and only the first part of the exhaust gas is transported by the first inter-chamber communication duct 118, a first-order noise damping effect is obtained in the first chamber 110. The first part of the exhaust gas undergoes expansion and compression when reaching the third chamber 138 before reaching the inlet portion 142 of the second inter-chamber communication duct 140. Therefore, a second-order noise damping effect is obtained in the third chamber 138. The first part of the exhaust gas undergoes expansion and compression when reaching the second chamber 112 before reaching the inlet portion 124 of the outlet duct 116. Therefore, a third-order noise damping effect is obtained in the second chamber 112.

[0077] Now, after the third level noise damping effect is achieved, at least one characteristic selected from the wavelength, loudness, and speed of the sound waves generated by the exhaust gas is changed. The change in at least one characteristic of the sound waves generated by the exhaust gas is believed to be caused by the mixing of the first part of the exhaust gas with the second part of the exhaust gas in the mixing zone 122. Therefore, the characteristics of the sound waves generated by the exhaust gas discharged from the exhaust muffler can be controlled by the nature of the mixing of the first part of the exhaust gas with the second part of the exhaust gas in the mixing zone 122 and the position of the mixing zone 122.

[0078] The nature of the mixing of the first portion of the exhaust gas with the second portion of the exhaust gas can be controlled by controlling the size and shape of the orifice 120 disposed in the first divider 108. As a non-limiting example, the size of the orifice 120 disposed in the first divider 108 is in the range of 25% to 47% of the size of the inlet port 124 of the outlet pipe 116. As another non-limiting example, the orifice 120 disposed in the first divider 108 can have a shape selected from a circular shape, an elliptical shape, a square shape, a pentagonal shape, a hexagonal shape, a heptagonal shape, an octagonal shape, a nonadecanagonal shape, a decagonal shape, and the like.

[0079] Turning now to the position of the mixing zone 122, as a non-limiting example, the mixing zone 122 can be located within a predetermined distance L from the entrance portion 124 of the outlet pipe 116. As another non-limiting example, the mixing zone 122 can be located within a predetermined radial distance R from the axis 126 of the outlet pipe 116. As another non-limiting example, the position of the mixing zone 122 can be easily controlled by controlling the position of the orifice 120 formed in the first divider 108. As a non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap by at least 20%. As another non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap each other relative to the axis 126 of the outlet pipe 116. As another non-limiting example, the orifice 120 and the entrance portion 124 of the outlet pipe 116 overlap by at least 20% relative to the axis 126 of the outlet pipe 116.

[0080] Although no similar Figure 8 is a graph for exhaust gas discharged from the exhaust muffler constructed according to the third embodiment, but it can be noted that the exhaust gas discharged from the exhaust muffler constructed according to the third embodiment also has a roaring effect compared with the exhaust gas discharged from the exhaust muffler without an orifice portion in the divider.

[0081] Reference Figure 5 , shows a schematic diagram of a three-chamber exhaust muffler 100 constructed according to a fourth embodiment of the present invention. The construction of the three-chamber exhaust muffler 100 according to the fourth embodiment is substantially similar to the construction of the three-chamber exhaust muffler 100 according to the third embodiment, except for the construction of the outlet pipe 116 for removing the exhaust gas from the second chamber 112. Therefore, the construction of the three-chamber exhaust muffler according to the third embodiment will be described in detail below (eg Figure 4 and as described above) and the structure of the three-chamber exhaust muffler according to the fourth embodiment (as shown in Figure 5 The difference between

[0082] Although the outlet pipe 116 for removing the exhaust gas from the second chamber 112 is solid in the three-chamber type exhaust muffler 100 according to the third embodiment, the outlet pipe 116 for removing the exhaust gas from the second chamber 112 according to the fourth embodiment is partially perforated. In particular, a portion of the outlet pipe 116 located in the third chamber 138 includes the perforated portion 134. Figure 2 In the exhaust muffler shown and described above in the first embodiment, the first portion of the exhaust gas from the first inter-chamber communication conduit 118 all reaches the mixing zone 122, but Figure 5 In the exhaust duct shown, the first portion of the exhaust gas from the first inter-chamber communicating duct 118 does not all reach the mixing zone 122. Instead, only a sub-portion of the first portion of the exhaust gas from the first inter-chamber communicating duct 118, hereinafter referred to as the third portion of the exhaust gas, reaches the mixing zone 122, and the remaining sub-portion, hereinafter referred to as the fourth portion, avoids the mixing zone 122 and directly enters the outlet duct 116 via the perforated portion 134 provided on the outlet duct 116. Therefore, according to the second embodiment, in the mixing zone 122, the second portion of the exhaust gas is mixed with the third portion of the exhaust gas and enters the outlet duct 116 via the entry portion 124. The fourth portion of the exhaust gas is then mixed in the outlet duct 116 (with the second and third portions of the exhaust gas). Due to the above reasons, an increase in exhaust noise (roaring effect) is observed compared to the third embodiment. Although in Figure 5 In FIG. 1 , the perforations in the outlet conduit 116 are shown as being located in the third chamber, but in an alternative embodiment (not shown), the perforations 134 in the outlet conduit 116 may be located in the second chamber.

[0083] Although no similar Figure 8 is a graph for exhaust gas discharged from the exhaust muffler constructed according to the fourth embodiment, but it can be noted that the exhaust gas discharged from the exhaust muffler constructed according to the fourth embodiment also has a roaring effect compared with the exhaust gas discharged from the exhaust muffler without an orifice portion in the divider.

[0084] Therefore, considering Figures 2 to 5In the embodiment shown, it can be said that the present invention provides an exhaust duct structure for an internal combustion engine used in a vehicle, the exhaust duct comprising: an outer wall, a first end wall and a second end wall, the outer wall, the first end wall and the second end wall cooperating to define an internal space; at least one separator, the separator is located between the first end wall and the second end wall, the separator divides the internal space into at least a first chamber and a second chamber; an inlet duct for introducing exhaust gas into the first chamber; an outlet duct for removing exhaust gas from the second chamber; at least one inter-chamber communication duct, the inter-chamber communication duct passes through at least one separator for conveying a first portion of exhaust gas from the first chamber to the second chamber; and an orifice portion provided in the separator located between the first chamber and the second chamber for conveying a second portion of exhaust gas from the first chamber to the second chamber. In an embodiment of the present invention, the outlet duct comprises a perforated portion.

[0085] Reference Figure 6 , shows a two-chamber type exhaust muffler 100 for a vehicle 10 according to a fifth embodiment of the present invention. Figure 6 The structure of the two-chamber exhaust muffler 100 shown in FIG. Figure 3 The structure of the two-chamber exhaust muffler 100 shown in FIG. 1 is basically similar, but there are the following differences. Figure 3 In the two-chamber exhaust muffler 100 shown in FIG. 1 , the first separator (108) is provided with an orifice portion 120, but Figure 6 In the two-chamber exhaust muffler 100 shown in FIG. 1 , the first partition 108 does not have the orifice portion 120. Therefore, all exhaust gas travels from the first chamber 110 to the second chamber 1120 via the first inter-chamber communication pipe 118. Figure 6 In the two-chamber type exhaust muffler 100 shown in FIG. 1 , the mixing zone 120 is not formed.

[0086] In addition, Figure 3 In the two-chamber type exhaust muffler 100 shown, the first discharge portion 128 forming a part of the first inter-chamber communication duct 118 allows the first part of the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication duct 118 or in a direction perpendicular to the axis of the first inter-chamber communication duct 118. Figure 6 In the illustrated two-chamber type exhaust muffler 100 , the first discharge portion 128 forming a part of the first inter-chamber communication duct 118 allows the exhaust gas to be discharged only in a direction parallel to the axis of the first inter-chamber communication duct 118 .

[0087] Although no similar Figure 8 3 is a graph for exhaust gas exhausted from the exhaust muffler constructed according to the fifth embodiment, but it can be noted that the exhaust gas exhausted from the exhaust muffler constructed according to the fifth embodiment also has a roaring effect.

[0088] Reference Figure 7 , shows a three-chamber type exhaust muffler 100 of a vehicle 10 according to a sixth embodiment of the present invention. Figure 7 The structure of the three-chamber exhaust muffler 100 shown in Figure 5 The three-chamber exhaust muffler 100 shown in FIG. 1 is basically similar in structure, but has the following differences. Figure 5 In the three-chamber exhaust muffler (100) shown in FIG. 1 , the first separator (108) is provided with an orifice portion 120, but Figure 7 In the three-chamber exhaust muffler 100 shown in FIG. 1 , the first partition 108 does not have the orifice portion 120. Therefore, all exhaust gas travels from the first chamber 110 to the third chamber 138 via the first inter-chamber communication pipe 118. Figure 7 In the three-chamber type exhaust muffler (100) shown in FIG. 1 , no mixing zone 120 is formed in the second chamber (112).

[0089] In addition, Figure 5 In the three-chamber type exhaust muffler 100 shown in FIG, the first discharge portion 128 forming a part of the first inter-chamber communication duct 118 allows the first part of the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication duct 118 or in a direction perpendicular to the axis of the first inter-chamber communication duct 118. However, in Figure 7 In the three-chamber type exhaust muffler 100 shown in FIG. 1 , the first discharge portion 128 forming a part of the first inter-chamber communication duct 118 allows the exhaust gas to be discharged only in a direction parallel to the axis of the first inter-chamber communication duct 118. Figure 5 The second discharge portion 144 of a portion of the second inter-chamber communication duct 140 shown in FIG. 1 allows the third portion of the exhaust gas to be discharged in a direction parallel to the axis of the second inter-chamber communication duct 140 or in a direction perpendicular to the axis of the second inter-chamber communication duct 140. However, in Figure 7 In the three-chamber type exhaust muffler 100 shown in FIG. 1 , the second discharge portion 144 forming a part of the second inter-chamber communication duct 140 allows only the third part of the exhaust gas to be discharged in a direction parallel to the axis of the second inter-chamber communication duct 140 .

[0090] Although no similar Figure 8 , but it can be noted that the exhaust gas discharged from the exhaust muffler constructed according to the sixth embodiment also has a roaring effect.

[0091] An advantage of the present invention is that the exhaust muffler increases the exhaust noise, thereby providing a unique sound effect. In particular, the exhaust muffler produces a roaring sound effect. Another advantage of the present invention is that the exhaust muffler does not significantly affect the performance of the engine. Another advantage of the present invention is that the size of the exhaust muffler is not increased to produce the roaring sound effect. Another advantage of the present invention is that no additional parts are used to construct the exhaust muffler. Another advantage of the present invention is that the time required to manufacture the exhaust muffler is relatively short. Another advantage of the present invention is that the cost of manufacturing the exhaust muffler is relatively low.

[0092] Although specific language has been used to describe the present disclosure, no limitations are intended to be limiting. It will be apparent to those skilled in the art that various operational modifications may be made to the method to implement the inventive concepts taught herein.

[0093] The accompanying drawings and the foregoing description give examples of embodiments. It will be appreciated by those skilled in the art that one or more of the elements may be combined into a single functional element. Alternatively, some elements may be split into multiple functional elements. Elements in one embodiment may be added to another embodiment. The scope of the embodiments is by no means limited by these specific examples. In addition, whether or not the specification is clearly given, multiple changes may be made, such as changes in structure, size, and material usage.

Claims

1. An exhaust muffler (100) for a vehicle (10), the exhaust muffler (100) comprising: An outer wall (102), a first end wall (104) and a second end wall (106), wherein the outer wall (102), the first end wall (104) and the second end wall (106) define an inner space; at least a first divider (108), the first divider (108) being located between the first end wall (104) and the second end wall (106) so as to divide the interior space into at least a first chamber (110) and a second chamber (112); an inlet conduit (114) for introducing exhaust gas into the first chamber (110); an outlet conduit (116) for releasing exhaust gas from the second chamber (112) to the environment; at least a first inter-chamber communication conduit (118) that transfers a first portion of the exhaust gas from the first chamber (110) to the second chamber (112); and An orifice (120) is disposed in the first divider (108) for transferring a second portion of the exhaust gas from the first chamber (110) to the second chamber (112).

2. The exhaust muffler (100) according to claim 1, wherein: The exhaust muffler (100) is a two-chamber exhaust muffler (100).

3. The exhaust muffler (100) according to claim 2, wherein: The first portion of the exhaust gas from the first inter-chamber communication duct (118) and the second portion of the exhaust gas from the orifice portion (120) provided in the first divider (108) are mixed in a mixing zone (122).

4. The exhaust muffler (100) according to claim 3, wherein: At least one characteristic selected from the group consisting of wavelength, loudness and speed of the sound waves generated by the exhaust gas is changed in the mixing zone (122).

5. The exhaust muffler (100) according to claim 3, wherein: The mixing zone (122) is located between the inlet conduit (114) and an entry portion (124) of the outlet conduit (116).

6. The exhaust muffler (100) according to claim 3, wherein: The mixing zone (122) is located within the second chamber (112) and is defined between the orifice (120) and an entry portion (124) of the outlet conduit (116).

7. The exhaust muffler (100) according to claim 2, wherein: The inlet portion (124) of the outlet conduit (116) is positioned relative to the outlet portion (128) of the first inter-chamber communication conduit (118) such that the first portion of the exhaust gas takes a tortuous path (130) between the inlet portion (124) of the outlet conduit (116) and the outlet portion (128) of the first inter-chamber communication conduit (118).

8. The exhaust muffler (100) according to claim 7, wherein: The tortuous path (130) includes at least one bend.

9. The exhaust muffler (100) according to claim 2, wherein: The exhaust gas undergoes expansion in the first chamber (110) before reaching the inlet portion (132) of the first inter-chamber connecting pipe (118) and / or the orifice portion (120) located in the first divider (108); and the exhaust gas undergoes expansion and compression in the second chamber (112) before reaching the inlet portion (124) of the outlet pipe (116).

10. The exhaust muffler (100) according to claim 2, wherein: The outlet pipe (116) includes a perforated portion (134), so that the first part of the exhaust gas is divided into a third part of the exhaust gas and a fourth part of the exhaust gas; the second part of the exhaust gas is mixed with the third part of the exhaust gas in a mixing zone (122) and enters the outlet pipe (116) via an entry portion (124), and the fourth part of the exhaust gas enters the outlet pipe (116) via the perforated portion (134).

11. The exhaust muffler (100) according to claim 1, wherein: The exhaust muffler (100) is a three-chamber exhaust muffler (100), and the three-chamber exhaust muffler (100) includes a first separator (108) and a second separator (136), wherein the first separator (108) and the second separator (136) are located between the first end wall (104) and the second end wall (106) to divide the internal space into a first chamber (110), a second chamber (112) and a third chamber (138).

12. The exhaust muffler (100) according to claim 11, comprising: a first inter-chamber communicating conduit (118), the first inter-chamber communicating conduit (118) transferring a first portion of the exhaust gas from the first chamber (110) to the third chamber (138); and a second inter-chamber communicating conduit (140), the second inter-chamber communicating conduit (140) transferring the first portion of the exhaust gas from the third chamber (138) to the second chamber (112).

13. The exhaust muffler (100) according to claim 11, wherein: The first portion of the exhaust gas from the second inter-chamber communication duct (140) is mixed with the second portion of the exhaust gas from the orifice portion (120) in a mixing zone (122).

14. The exhaust muffler (100) according to claim 13, wherein: The mixing zone (122) is located within the second chamber (112) and is defined between the orifice (120) and an entry portion (124) of the outlet conduit (116).

15. The exhaust muffler (100) according to claim 11, wherein: The second inter-chamber communicating pipe (140) includes an inlet portion (142), and the inlet portion (142) of the second inter-chamber communicating pipe (140) is positioned relative to the outlet portion (128) of the first inter-chamber communicating pipe (118) so that: the first part of the exhaust gas takes a first tortuous path (130) between the inlet portion (142) of the second inter-chamber communicating pipe (140) and the outlet portion (128) of the first inter-chamber communicating pipe (118); and the inlet portion (124) of the outlet pipe (116) is positioned relative to the outlet portion (144) of the second inter-chamber communicating pipe (140) so that: the first part of the exhaust gas takes a second tortuous path (146) between the inlet portion (124) of the outlet pipe (116) and the outlet portion (144) of the second inter-chamber communicating pipe (140).

16. The exhaust muffler (100) according to claim 15, wherein: The first tortuous path (130) includes at least one bend; and the second tortuous path (146) includes at least one bend.

17. The exhaust muffler (100) according to claim 11, wherein: The exhaust gas undergoes expansion in the first chamber (110) before reaching the inlet portion (132) of the first inter-chamber communication conduit (118) and / or the orifice portion (120) located in the first divider (108); and the exhaust gas undergoes expansion and compression in the third chamber (138) before reaching the inlet portion (142) of the second inter-chamber communication conduit (140); and The exhaust gas undergoes expansion and compression in the second chamber (112) before reaching the inlet portion (124) of the outlet conduit (116).

18. The exhaust muffler (100) according to claim 11, wherein: The outlet conduit (116) for removing exhaust gas from the second chamber (112) includes a perforated portion (134).

19. The exhaust muffler (100) according to claim 18, wherein: The exhaust muffler has at least one of the following features: The outlet conduit (116) in the third chamber (138) includes a perforated portion (134); and The outlet conduit (116) located in the second chamber (112) includes a perforated portion (134).

20. The exhaust muffler (100) according to claim 1, wherein: The orifice portion (120) and an inlet portion (124) of the outlet duct (116) overlap each other relative to an axis (126) of the outlet duct (116).

21. The exhaust muffler (100) according to claim 1, wherein: The orifice (120) overlaps an entry portion (124) of the outlet conduit (116) by at least 20% relative to an axis (126) of the outlet conduit (116).

22. A saddle-type vehicle (10), comprising: A single cylinder engine unit (26); the single cylinder engine unit (26) discharges exhaust gas; as well as An exhaust muffler (100) is attached to the engine (26); the exhaust muffler (100) comprises: An outer wall (102), a first end wall (104) and a second end wall (106), wherein the outer wall (102), the first end wall (104) and the second end wall (106) cooperate to define an interior space; at least a first divider (108), the first divider (108) being located between the first end wall (104) and the second end wall (106) so as to divide the interior space into at least a first chamber (110) and a second chamber (112); an inlet conduit (114) for introducing exhaust gas into the first chamber (110); an outlet conduit (116) for releasing exhaust gas from the second chamber (112) to the environment; at least a first inter-chamber communication conduit (118) that transfers a first portion of the exhaust gas from the first chamber (110) to the second chamber (112); and An orifice (120) is disposed in the first divider (108) for transferring a second portion of the exhaust gas from the first chamber (110) to the second chamber (112).

23. An exhaust muffler (100) for a vehicle (10), the exhaust muffler (100) comprising: An outer wall (102), a first end wall (104) and a second end wall (106), wherein the outer wall (102), the first end wall (104) and the second end wall (106) define an inner space; at least a first divider (108) located between the first end wall (104) and the second end wall (106) to divide the interior space into at least a first chamber (110) and a second chamber (112); an inlet conduit (114) for introducing exhaust gas into the first chamber (110); an outlet conduit (116) for releasing exhaust gas from the second chamber (112) to the environment, the outlet conduit (116) comprising an entry portion (124) and a perforated portion (134) to allow the exhaust gas from the second chamber (112) to enter the outlet conduit (116); and At least a first inter-chamber communication conduit (118), wherein the first inter-chamber communication conduit (118) transmits the exhaust gas from the first chamber (110) to the second chamber (112), and the first inter-chamber communication conduit (118) includes a first discharge portion (128) to allow the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication conduit (118).

24. The exhaust muffler (100) according to claim 23, wherein: The exhaust muffler (100) is at least one of a two-chamber exhaust muffler (100) and a three-chamber exhaust muffler (100).

25. The exhaust muffler (100) according to claim 24, wherein: The three-chamber exhaust muffler (100) comprises: a first divider (108) and a second divider (136), wherein the first divider (108) and the second divider (136) are located between the first end wall (104) and the second end wall (106) to divide the inner space into a first chamber (110), a second chamber (112) and a third chamber (138); a first inter-chamber communication conduit (118), the first inter-chamber communication conduit (118) transferring the exhaust gas from the first chamber (110) to the third chamber (138); A second inter-chamber communication conduit (140) is provided, wherein the second inter-chamber communication conduit (140) transmits the exhaust gas from the third chamber (138) to the second chamber (112).

26. The exhaust muffler (100) according to claim 23, wherein: The exhaust muffler has at least one of the following features: The first inter-chamber communication pipe (118) includes a first discharge portion (128) so as to allow the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication pipe (118); and The second inter-chamber communication duct (140) includes a second discharge portion (144) so ​​as to allow the exhaust gas to be discharged in a direction parallel to an axis of the second inter-chamber communication duct (144).

27. A saddle-type vehicle (10), comprising: A single cylinder engine unit (26); the single cylinder engine unit (26) discharges exhaust gas; as well as An exhaust muffler (100) is attached to the engine (26); the exhaust muffler (100) comprises: An outer wall (102), a first end wall (104) and a second end wall (106), wherein the outer wall (102), the first end wall (104) and the second end wall (106) define an inner space; at least a first divider (108), the first divider (108) being located between the first end wall (104) and the second end wall (106) so as to divide the interior space into at least a first chamber (110) and a second chamber (112); an inlet conduit (114) for introducing exhaust gas into the first chamber (110); an outlet conduit (116) for releasing exhaust gas from the second chamber (112) to the environment, the outlet conduit (116) comprising an entry portion (124) and a perforated portion (134) to allow the exhaust gas from the second chamber (112) to enter the outlet conduit (116); and At least a first inter-chamber communication conduit (118), wherein the first inter-chamber communication conduit (118) transmits the exhaust gas from the first chamber (110) to the second chamber (112), and the first inter-chamber communication conduit (118) includes a first discharge portion (128) to allow the exhaust gas to be discharged in a direction parallel to the axis of the first inter-chamber communication conduit (118).

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