Exhaust Muffler

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Indian Application No. 202411067478, filed on Sep. 6, 2024. The entire disclosure of the application referenced above is incorporated herein by reference.

FIELD

The present disclosure generally relates to an exhaust muffler, used in particular for dampening noise entailed by the emission of exhaust gases from an exhaust system of an internal combustion engine.

BACKGROUND

Generally, an internal combustion engine of an automobile is equipped with an exhaust system. The exhaust system functions to reduce the noise from the engine while emitting the exhaust out from the engine. To reduce the noise, an exhaust muffler is arranged to define a path for the exhaust gas such that the noise is reduced.

The muffler is generally filled and/or packed with roving, particularly with glass and/or mineral fibers widely used for acoustic insulation and/or attenuation in the exhaust system. In the case of glass fibers, it is a common practice to chop continuous filament material into short lengths (staple fibers), thereafter forming a mat from the staple fibers produced, or simply packing the staple fibers into a supporting member. Thus, staple fibers are packed into muffler casings. However, these methods of installation, and/or packaging, and/or filling of glass fibers into the muffler have environment, health, and safety concerns.

Further, as an improvement to the existing roving filling methods, bagged/brick roving is used in the muffler for acoustic insulation and/or attenuation in the exhaust system. However, these methods are costly and further not ideal.

An example of an improved muffler is provided in U.S. Pat. No. 10,508,580 B2 (hereinafter referred to as '580 reference). The '580 reference provides a combined heat exchanger and exhaust muffler for a vehicle that includes a bypass valve configured to in a first state, allow a flow path for exhaust gas to be open from an inlet to an outlet via an at least partly perforated bypass pipe, and in a second state, close the flow path, whereby at least a main portion of the exhaust gas is forced through a second flow channel comprising a heat exchanger pipe. The second flow channel is formed by an annular space between an at least partly perforated second pipe and an at least partly perforated third pipe. A sound absorbing material surrounds the bypass pipe and the third pipe and is further arranged inside the second pipe.

Another example of an improved muffler is provided in German Patent DE 841,834 C (hereinafter referred to as '834 reference). The '834 reference provides a muffler for internal combustion engines that effectively dampens pulsating flows by utilizing internal sound-absorbing cushions, allowing for improved sound absorption and acoustical tuning while reducing overall size and cost.

SUMMARY

According to an aspect, an exhaust muffler is provided. The exhaust muffler includes a hollow body defining an inlet opening and an outlet opening, and an exhaust pipe fluidly coupling the inlet opening to the outlet opening, such that the exhaust pipe is disposed at least partially within the hollow body. The exhaust pipe is adapted to allow a flow of exhaust gases therethrough. Further, the exhaust pipe defines a plurality of orifices on the exhaust pipe such that the exhaust gases flowing through the exhaust pipe can flow out of the exhaust pipe within the hollow body and/or flow back into the exhaust pipe from the hollow body through the plurality of orifices. Further, a secondary pipe is disposed within the hollow body, such that the secondary pipe is filled with a sound absorbing material. Further, the secondary pipe is disposed at an offset from the exhaust pipe within the hollow body. The exhaust muffler further includes at least one baffle, such that the baffle is connected with the exhaust pipe to allow the exhaust pipe to pass therethrough and the baffle is connected with the secondary pipe to allow the secondary pipe to pass therethrough.

The exhaust muffler can advantageously include sound attenuation means in the form of the secondary pipe, which is filled with the sound absorbing material and further defines a plurality of orifices. The sound absorbing material can be glass and/or mineral fibers, and/or any other material feasible for soundproofing. The secondary pipe is disposed proximal to the exhaust pipe such that both the secondary pipe and the exhaust pipe are assembled at least partially within the hollow body in a compact manner. The exhaust pipe further advantageously has an acoustic flow path to the secondary pipe to attenuate high frequencies. In other words, the exhaust gases flowing through the exhaust pipe can flow out of the exhaust pipe towards the secondary pipe and flow back into the exhaust pipe from the secondary pipe through the plurality of orifices defined by the exhaust pipe. However, the plurality of orifices defined by the exhaust pipe is optional. In other words, the exhaust pipe can be a pipe with solid walls and no orifices. In such case, the exhaust gas flow can travel through these pipes back and forth in the muffler, and at some point, this flow contacts the secondary pipe that too has plurality of orifices.

Further, the at least one baffle includes the first opening and the second opening that have shape and size corresponding to the shape and size of the exhaust pipe and the secondary pipe respectively such that the exhaust pipe and the secondary pipe when at least partially disposed in the hollow body, securely rest on the first opening and the second opening respectively. Further, the at least one baffle removably holds and/or supports the exhaust pipe and the secondary pipe in a desired orientation at least partially within the hollow body.

According to an embodiment of the present disclosure, the secondary pipe is capped at least at one end. The secondary pipe is capped or plugged at one or both ends in a suitable manner to form a semi-closed or closed system or housing for safely and securely storing the sound absorbing material into the secondary pipe. Further, the secondary pipe can be capped in a removable manner to allow overhauling of the secondary pipe when required.

According to an embodiment of the present disclosure, the at least one baffle includes two baffles disposed parallel to each other such that the exhaust muffler is divided into a first chamber, a second chamber and a third chamber. The at least one baffle can preferably be two or more baffles disposed parallel to or at a slightly acute angle to each other without affecting the working of the exhaust muffler and/or without affecting the exhaust gas flow via the exhaust muffler. Further, the chamber walls of the chambers thus formed can also at least marginally contribute to sound attenuation.

According to an embodiment of the present disclosure, the secondary pipe extends across only one of the first chamber, the second chamber and the third chamber. According to an embodiment of the present disclosure, the secondary pipe extends across at least one of the first chamber, the second chamber and the third chamber. According to an embodiment of the present disclosure, the secondary pipe extends across all of the first chamber, the second chamber and the third chamber. The secondary pipe can selectively span across one or more of the chambers formed by the two baffles disposed parallel to each other within the hollow body based on the amount of the sound absorbing material to be filled, among other factors.

According to an embodiment of the present disclosure, the exhaust pipe is made up of a two-part structure. The exhaust pipe can have two parts such that secondary pipe can be assembled in between the two-part structure of the exhaust pipe such that the exhaust pipe advantageously has the acoustic flow path to the secondary pipe to attenuate high frequencies.

According to an embodiment of the present disclosure, the secondary pipe is made up of a two-part structure. The exhaust pipe and/or the secondary pipe can be made up of the two-part structure, as per requirement to improve the efficiency of the exhaust muffler.

According to an embodiment of the present disclosure, the at least one baffle includes an integrally formed recess such that the secondary pipe is capped at least at one end. The secondary pipe can be capped at least at one end using baffle, particularly, the recess of the baffle such that the roving material can be securely stored into the secondary pipe.

Further areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view of an exhaust muffler, according to a first embodiment of the present disclosure;

FIG. 2 is a schematic view of an exhaust muffler, according to a second embodiment of the present disclosure;

FIG. 3 is a schematic view of an exhaust muffler, according to a third embodiment of the present disclosure;

FIG. 4 is a schematic view of an exhaust muffler, according to a fourth embodiment of the present disclosure;

FIG. 5 is a schematic view of an exhaust muffler, according to a fifth embodiment of the present disclosure;

FIG. 6 is a schematic view of an exhaust muffler, according to a sixth embodiment of the present disclosure;

FIG. 7 illustrates a schematic view of an exhaust muffler according to a seventh embodiment of the present disclosure;

FIG. 8 illustrates a schematic view of an exhaust muffler according to an eight embodiment of the present disclosure;

FIGS. 9A and 9B illustrate a schematic view of a secondary pipe and a front view of a secondary pipe respectively, according to a ninth embodiment of the present disclosure;

FIG. 10 illustrates a schematic view of an exhaust muffler, according to a tenth embodiment of the present disclosure;

FIGS. 11A and 11B illustrate a sectional view of an exhaust pipe and a front view of an exhaust pipe respectively, according to an eleventh embodiment of the present disclosure;

FIG. 12 illustrates a sectional view of a secondary pipe of an exhaust muffler according to any of the previous embodiments of the present disclosure;

FIGS. 13A and 13B illustrate an assembled view of a secondary pipe and an unassembled view of a secondary pipe respectively, according to a thirteenth embodiment of the present disclosure;

FIG. 14 illustrates a schematic view of an exhaust pipe according to a fourteenth embodiment of the present disclosure;

FIG. 15 illustrates a partial cross-section view of an exhaust pipe according to a fourteenth embodiment of the present disclosure;

FIG. 16A illustrates a partial perspective view of an exhaust pipe according to a fifteenth embodiment of the present disclosure; and

FIG. 16B illustrates an exploded perspective view of the exhaust pipe of FIG. 16A according to a fifteenth embodiment of the present disclosure.

DETAILED DESCRIPTION

The following description is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses. Referring now to the drawings, like reference numerals designate like or corresponding parts throughout the several views. Referring to FIG. 1, FIG. 1 illustrates a schematic view of an exhaust muffler 100 according to a first embodiment of the present disclosure. The exhaust muffler 100 is a muffler connected to an exhaust system of an internal combustion engine by a coupling means. The exhaust fluid, normally air and other exhaust gasses, flowing through the exhaust system carries sound waves generated during operation of the engine. The majority of the sound waves are considered undesirable noise which is to be muffled.

The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The hollow body 110 is preferably a cylindrical body made from any non-corrosive and durable material e.g. stainless steel. Further, the inlet opening 112 and the outlet opening 114 of the hollow body 110 have preferably a circular or oval or trioval cross-section, preferably with a parallel orientation relative to each other.

The exhaust muffler 100 further includes an exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 can have length smaller, larger, or equal to the hollow body 110. The exhaust pipe 120 can have a shape similar or dissimilar to the hollow body 110. The exhaust pipe 120 can be made from a material similar or dissimilar to the material of the hollow body 110. The exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

The plurality of orifices 122 can have circular, oval, triangular, square, rectangular, or any other shape as per requirement. The plurality of orifices 122 can have different shapes, and sizes as per requirement. The plurality of orifices 122 can either be disposed along the entire length of the exhaust pipe 120 or can be disposed only in some parts of the exhaust pipe 120. The plurality of orifices 122 can be continuously or discretely arranged on the exhaust pipe 120. The plurality of orifices 122 can be different groups of plurality of orifices 122 spaced apart from each other such that the plurality of orifices 122 in each of the groups of plurality of orifices 122 can have similar, or different dimensions.

Further, in continuous reference to FIG. 1, a secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with a sound absorbing material. The sound absorbing material can be glass fibers, mineral fibers, or any other suitable material without limiting the scope of the present disclosure. The secondary pipe 130 can be smaller, larger, or equal in dimensions with the exhaust pipe 120. Further, the secondary pipe 130 can have shape similar or dissimilar to the exhaust pipe 120. Further, the secondary pipe 130 can have length smaller, larger, or equal to the hollow body 110. Further, the secondary pipe 130 can be made from a material similar or dissimilar to the material of the hollow body 110, and/or the exhaust pipe 120. Preferably, the secondary pipe 130 can be made from high temperature molded plastic for reducing weight of the secondary pipe 130, and thus reducing the weight of the exhaust muffler 100 thereof.

Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110 in a parallel or non-parallel orientation relative to the exhaust pipe 120, and/or the hollow body 110. Further, the secondary pipe 130 is assembled higher than the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100.

Further, the secondary pipe 130 is capped at least at one end in any suitable manner without limiting the scope of the present disclosure. Further, the secondary pipe 130 defines a plurality of orifices 132 that can have circular, oval, triangular, square, rectangular, or any other shape as per requirement. The plurality of orifices 132 can have different shapes, and sizes as per requirement. The plurality of orifices 132 can either be disposed along the entire length of the secondary pipe 130 or can be disposed only in some parts of the secondary pipe 130. The plurality of orifices 132 can be continuously or discretely arranged on the secondary pipe 130. The plurality of orifices 132 can be different groups of plurality of orifices 132 spaced apart from each other such that the plurality of orifices 132 in each of the groups of plurality of orifices 132 can have similar, or different dimensions. The plurality of orifices 132 can have arrangement, number, shape, and size similar to or different than the plurality of orifices 122.

Further, the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122.

Further, in continuous reference to FIG. 1, the exhaust muffler 100 further includes at least one baffle 140. The at least one baffle 140 is fixedly or removably coupled to the hollow body 110 in any known manner in the related art. The at least one baffle 140 defines a first opening 142 to allow the exhaust pipe 120 to pass therethrough and further to support the exhaust pipe 120 in the hollow body 110. In other words, the baffle 140 is connected with the exhaust pipe 120 to allow the exhaust pipe 120 to pass therethrough. Further, the at least one baffle 140 defines a second opening 144 to allow the secondary pipe 130 to pass therethrough and further to support the secondary pipe 130 in the hollow body 110. In other words, the baffle 140 is connected with the secondary pipe 130 to allow the secondary pipe 130 to pass therethrough. The first opening 142 and the second opening 144 has the shape and size similar to the shape and cross-section of the exhaust pipe 120 and the secondary pipe 130 respectively, and further may have respective orientations similar to the orientations of the exhaust pipe 120 and the secondary pipe 130 respectively.

Further, the at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into a first chamber 102, a second chamber 104 and a third chamber 106. Each of the two baffles 140 include the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough. Further, the first chamber 102, the second chamber 104 and the third chamber 106 can have similar or dissimilar volumes inside the hollow body 110 as per function requirements of the exhaust muffler 100. In other words, the first chamber 102, the second chamber 104 and the third chamber 106 can divide the exhaust muffler 100, and/or the hollow body 110 into three equal or unequal halves.

Further, in this embodiment, the secondary pipe 130 extends across at least one of the first chamber 102, the second chamber 104, and the third chamber 106. Particularly, the secondary pipe 130 extends fully across the second chamber 104, and at least partially across the first chamber 102, and the third chamber 106, with the extension across the first chamber 102 being equal to the extension across the third chamber 106.

FIG. 2 illustrates a schematic of the exhaust muffler 100 according to a second embodiment of the present disclosure. The exhaust muffler 100 of the second embodiment includes components similar to the exhaust muffler 100 of the first embodiment. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The exhaust muffler 100 further includes the exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

Further, the secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with the sound absorbing material. Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110. Further, the secondary pipe 130 is assembled higher than the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Further, the secondary pipe 130 is capped at least at one end. Further, the secondary pipe 130 defines a plurality of orifices 132, such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122.

Further, in continuous reference to FIG. 2, the exhaust muffler 100 further includes at least one baffle 140 that defines the first opening 142 to allow the exhaust pipe 120 to pass therethrough and the second opening 144 to allow the secondary pipe 130 to pass therethrough. The at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into the first chamber 102, the second chamber 104 and the third chamber 106 with each of the two baffles 140 including the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough.

Further, in this embodiment, the secondary pipe 130 extends across only one of the first chamber 102, the second chamber 104 and the third chamber 106. Particularly, the secondary pipe 130 extends only across the third chamber 106 of the exhaust muffler 100, and/or the hollow body 110.

FIG. 3 illustrates a schematic of the exhaust muffler 100 according to a third embodiment of the present disclosure. The exhaust muffler 100 of the third embodiment includes components similar to the exhaust muffler 100 of any of the previous embodiments. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The exhaust muffler 100 further includes the exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

Further, the secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with the sound absorbing material. Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110. Further, the secondary pipe 130 is assembled higher than the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Further, the secondary pipe 130 is capped at least at one end. Further, the secondary pipe 130 defines a plurality of orifices 132, such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122.

Further, in continuous reference to FIG. 3, the exhaust muffler 100 further includes at least one baffle 140 that defines the first opening 142 to allow the exhaust pipe 120 to pass therethrough and the second opening 144 to allow the secondary pipe 130 to pass therethrough. The at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into the first chamber 102, the second chamber 104 and the third chamber 106 with each of the two baffles 140 including the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough.

Further, in this embodiment, the secondary pipe 130 extends across at least one of the first chamber 102, the second chamber 104, and the third chamber 106. Particularly, the secondary pipe 130 extends across the second chamber 104 and the third chamber 106 of the exhaust muffler 100, and/or the hollow body 110.

FIG. 4 illustrates a schematic of the exhaust muffler 100 according to a fourth embodiment of the present disclosure. The exhaust muffler 100 of the fourth embodiment includes components similar to the exhaust muffler 100 of any of the previous embodiments. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The exhaust muffler 100 further includes the exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

Further, the secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with the sound absorbing material. Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110. Further, the secondary pipe 130 is assembled higher than the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Further, the secondary pipe 130 is capped at least at one end. Further, the secondary pipe 130 defines a plurality of orifices 132, such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122.

Further, in continuous reference to FIG. 4, the exhaust muffler 100 further includes at least one baffle 140 that defines the first opening 142 to allow the exhaust pipe 120 to pass therethrough and the second opening 144 to allow the secondary pipe 130 to pass therethrough. The at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into the first chamber 102, the second chamber 104 and the third chamber 106 with each of the two baffles 140 including the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough.

Further, in this embodiment, the secondary pipe 130 extends across at least one of the first chamber 102, the second chamber 104, and the third chamber 106. Particularly, the secondary pipe 130 extends fully across the second chamber 104, and at least partially across the first chamber 102, and the third chamber 106, with the extension across the first chamber 102 being more than the extension across the third chamber 106.

FIG. 5 illustrates a schematic of the exhaust muffler 100 according to a fifth embodiment of the present disclosure. The exhaust muffler 100 of the fifth embodiment includes components similar to the exhaust muffler 100 of any of the previous embodiments. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The exhaust muffler 100 further includes the exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

Further, the secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with the sound absorbing material. Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110. Further, the secondary pipe 130 is assembled higher than the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Further, the secondary pipe 130 is capped at least at one end. Further, the secondary pipe 130 defines a plurality of orifices 132, such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122.

Further, in continuous reference to FIG. 5, the exhaust muffler 100 further includes at least one baffle 140 that defines the first opening 142 to allow the exhaust pipe 120 to pass therethrough and the second opening 144 to allow the secondary pipe 130 to pass therethrough. The at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into the first chamber 102, the second chamber 104 and the third chamber 106 with each of the two baffles 140 including the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough.

Further, in this embodiment, the secondary pipe 130 extends across only one of the first chamber 102, the second chamber 104 and the third chamber 106. Particularly, the secondary pipe 130 extends only across the second chamber 104 of the exhaust muffler 100, and/or the hollow body 110.

FIG. 6 illustrates a schematic of the exhaust muffler 100 according to a sixth embodiment of the present disclosure. The exhaust muffler 100 of the sixth embodiment includes components similar to the exhaust muffler 100 of any of the previous embodiments. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The exhaust muffler 100 further includes the exhaust pipe 120 fluidly coupling the inlet opening 112 to the outlet opening 114 and disposed at least partially within the hollow body 110. The exhaust pipe 120 is adapted to allow a flow of exhaust gases therethrough. The exhaust pipe 120 of this embodiment is made up of a two-part structure such that the two-parts are at an offset to each other. Further, the exhaust pipe 120 defines a plurality of orifices 122 on the exhaust pipe 120 such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 and/or flow back into the exhaust pipe 120 from the hollow body 110 through the plurality of orifices 122.

Further, the secondary pipe 130 is disposed within the hollow body 110, such that the secondary pipe 130 is filled with the sound absorbing material. Further, the secondary pipe 130 is disposed at an offset from the exhaust pipe 120 within the hollow body 110. Further, the secondary pipe 130 is assembled between two-part structure of the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Further, the secondary pipe 130 is capped at least at one end. Further, the secondary pipe 130 defines a plurality of orifices 132, such that the exhaust gases flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132, and/or then flow back into the exhaust pipe 120 through the plurality of orifices 122, as shown with arrows in FIG. 6.

Further, in continuous reference to FIG. 6, the exhaust muffler 100 further includes at least one baffle 140 that defines the first opening 142 to allow the exhaust pipe 120 to pass therethrough and the second opening 144 to allow the secondary pipe 130 to pass therethrough. The at least one baffle 140 includes two similar baffles 140 disposed parallel to each other such that the exhaust muffler 100 is divided into the first chamber 102, the second chamber 104 and the third chamber 106 with each of the two baffles 140 including the first opening 142 configured to allow the exhaust pipe 120 to pass therethrough and the second opening 144 configured to allow the secondary pipe 130 to pass therethrough. Further, in this embodiment, the secondary pipe 130 extends across all of the first chamber 102, the second chamber 104, and the third chamber 106.

According to another embodiment of the present disclosure, the secondary pipe 130 may also be made up of a two-part structure. The exhaust pipe 120 and/or the secondary pipe 130 can be made up of the two-part structure, as per application requirements to improve the efficiency of the exhaust muffler 100.

FIG. 7 illustrates a schematic view of the exhaust muffler 100 according to a seventh embodiment of the present disclosure. The secondary pipe 130, according to this embodiment, is capped at both ends using two separate caps 134 that respectively couples with, preferably, snap fits with the two ends of the secondary pipe 130.

FIG. 8 illustrates a schematic view of the exhaust muffler 100 according to an eight embodiment of the present disclosure. The secondary pipe 130, according to this embodiment, is capped at both ends using two baffles 140, each having a recess 146, or depression 146 that at least partially intrude into the secondary pipe 130 via the respective ends of the secondary pipe 130. The recess 146, or depression 146 is configured to plug both ends of the secondary pipe 130. In other words, the at least one baffle 140 includes an integrally formed recess 146 such that the secondary pipe 130 is capped at least at one end by virtue of the recess 146. The recess 146 is formed with second opening 144 of each of the holding brackets 130. However, the recess 146 can also be formed with first opening 142 of each of the holding brackets 130.

FIGS. 9A and 9B illustrate a schematic view of the secondary pipe 130 and a front view of the secondary pipe 130 respectively, according to a ninth embodiment of the present disclosure. The secondary pipe 130, according to this embodiment, is capped at both ends by crimping both the ends of the secondary pipe 130.

FIG. 10 illustrates a schematic view of the exhaust muffler 100 according to a tenth embodiment of the present disclosure. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The hollow body 110 in this embodiment is functionally configured as the exhaust pipe 120 and is adapted to allow the flow of exhaust gases therethrough. Further, the secondary pipe 130 is disposed within the hollow body 110 using at least one holding bracket 148 provided with the hollow body 110. The at least one holding bracket 148 includes a hole 150 to allow the secondary pipe 130 to pass therethrough. Further, the at least one holding bracket 148 includes at least one slit 152 upstream and downstream the hole 150 to allow the exhaust gases to pass therethrough. In an alternate embodiment, the at least one holding bracket 148 may have plurality of orifices, or perforations throughout the surface of the at least one holding bracket 148. However, the at least one holding bracket 148 can have any other design as per requirement.

Further, the secondary pipe 130 is filled with the sound absorbing material. The sound absorbing material can be glass fibers, mineral fibers, or any other suitable material without limiting the scope of the present disclosure. The secondary pipe 130 is capped at both ends using two separate caps 134 that respectively couples with, preferably, snap fits with the two ends of the secondary pipe 130. Further, the secondary pipe 130 defines the plurality of orifices 132 such that the exhaust gases flowing through the hollow body 110 can flow towards the secondary pipe 130 and contact the sound absorbing material packed or filled within the secondary pipe 130 via the plurality of orifices 132.

FIGS. 11A and 11B illustrate a sectional view of the exhaust pipe 120 and a front view of the exhaust pipe 120 respectively, according to an eleventh embodiment of the present disclosure. The exhaust pipe 120 is adapted to allow the flow of exhaust gases therethrough. The exhaust pipe 120 includes two concentric secondary pipes 130, each having plurality of orifices 132. The two concentric secondary pipes 130 defines an annular space “S” between them such that the sound absorbing material, or the roving is filled in the annular space “S”. The filling of the sound absorbing material, or the roving is maintained at position using end caps 134′ having annular profile and disposed on both ends of the filling of the sound absorbing material or the roving in the annular space “S”.

FIG. 12 illustrates a sectional view of the secondary pipe 130 of the exhaust muffler 100 according to any of the previous embodiments of the present disclosure. The secondary pipe 130 with orifices 132 is filled with the sound absorbing material. The sound absorbing material can be glass fibers, mineral fibers, or any other suitable material without limiting the scope of the present disclosure. The sound absorbing material is configured to dampen the noise entailed by the emission of exhaust gases flowing via the exhaust pipe 120.

FIGS. 13A and 13B illustrate an assembled view of a secondary pipe 130′ and an unassembled view of a secondary pipe 130′ respectively, according to a thirteenth embodiment of the present disclosure. The exhaust muffler 100 includes the hollow body 110 defining the inlet opening 112 and the outlet opening 114. The hollow body 110 in this embodiment is functionally configured as the exhaust pipe 120 and is adapted to allow the flow of exhaust gases therethrough. Further, the secondary pipe 130′ is disposed within the hollow body 110 such that it at least partially receives the exhaust gas flowing within the hollow body 110 of the aftertreatment component 100. The secondary pipe 130′ is filled with the sound absorbing material and defines a plurality of orifices 132′.

Further, the secondary pipe 130′ includes a first face 131, a second face 133, and a third face 135 that are joined together simply by folding with respect to each other. Each of the first face 131, the second face 133, and the third face 135 of the secondary pipe 130′ includes the plurality of orifices 132′. Further, the second face 133 of the secondary pipe 130′ includes triangular protrusions 136, 137 at opposed ends, while each of the first face 131, and the third face 135 includes a triangular protrusion 138, 139 respectively, and a substantially curved protrusion 141 respectively at opposed ends such that the substantially curved protrusion 141 of the first face 131 is diagonally opposite to the substantially curved protrusion 141 of the third face 135. Likewise, the triangular protrusion 138 of the first face 131 is diagonally opposite to the triangular protrusion 139 of the third face 135. Further, the substantially curved protrusions 141 of the first face 131 and the third face 135 respectively are configured to function as holding structures of the secondary pipe 130′ within the hollow body 110. Further, the substantially curved protrusions 141 have a slit, or other means respectively to allow the ingress and egress of the exhaust gas from the secondary pipe 130′.

FIG. 14 illustrates a schematic view of the exhaust pipe 120 according to a fourteenth embodiment of the present disclosure. The exhaust pipe 120 has a bent cross-section and includes the plurality of orifices 122 at a portion or some of the portion of the exhaust pipe 120. Further, downstream of the exhaust pipe 120 is the secondary pipe 130 filled with the sound absorbing material, or the roving to attenuate the noise produced by the exhaust gas. In other words, the secondary pipe 130 is integrally or separately formed with the exhaust pipe 120 and disposed downstream of the exhaust pipe 120 in the flow direction of the exhaust gases. For example, when the secondary pipe 130 is separately formed with the exhaust pipe 120, a baffle between the secondary pipe 130 and the exhaust pipe 120 is placed. The baffle (not shown on the FIG. 14) can be partially perforated, or fully perforated. Further, the baffle can be a circular body coupled to the exhaust muffler 100 from inside of the exhaust muffler 100 such that the baffle includes a circular opening configured to hold and/or allow coupling of the exhaust pipe 120 and the secondary pipe 130. In the space created between baffle and cap 134 (also not shown) positioned on the end of the secondary pipe 130, the sound absorbing material, or the roving to attenuate the noise produced by the exhaust gas is inserted. Further, the secondary pipe 130 includes the plurality of orifices 132 positioned at some portion of the secondary pipe 130 or all of the secondary pipe 130. Further, the plurality of orifices 132 can be positioned at the junction between the secondary pipe 130 and the exhaust pipe 120 where the secondary pipe 130 and the exhaust pipe 120 are connected to each other, or at the opposite side of the secondary pipe 130 where the secondary pipe 130 can be plugged, or could dead end into another baffle.

FIG. 15 illustrates a partial cross-section view of the exhaust pipe 120 according to the fourteenth embodiment of the present disclosure. The exhaust pipe 120 has a bent cross-section and includes the plurality of orifices 122 at a portion or some of the portion of the exhaust pipe 120. Further, downstream of the exhaust pipe 120 is the secondary pipe 130 filled with the sound absorbing material, or the roving to attenuate the noise produced by the exhaust gas. In other words, the secondary pipe 130 is integrally or separately formed with the exhaust pipe 120 and disposed downstream of the exhaust pipe 120 in the flow direction of the exhaust gases.

FIG. 16A illustrates a schematic view of the exhaust pipe 120 according to the fifteenth embodiment of the present disclosure. The exhaust pipe 120 has a bent cross-section and includes the plurality of orifices 122 at a portion or some of the portion of the exhaust pipe 120. Further, downstream of the exhaust pipe 120 is the secondary pipe 130. The secondary pipe 130 encloses a mixing element 154. FIG. 16B illustrates an exploded view of the exhaust pipe 120 with the mixing element 154 outside of the exhaust pipe 120. With combined reference to FIGS. 16A and 16B, the mixing element 154 is fully enclosed by the secondary pipe 130. The mixing element 154 includes a first plate 156 and a second plate 158 joined together by multiple link elements 160. In the illustrated embodiment, the first plate 156 and the second plate 158 are joined together by 3 link elements. However, the first plate 156 and the second plate 158 may be joined together by any other suitable number of link elements 160 as well. The first plate 156 has a perforated planar structure. The second plate 158 has a substantially solid planar structure. The mixing element 154 may be resistance welded with the secondary pipe 130. More specifically, the second plate 158 may be resistance welded with an end of the secondary pipe 130. The mixing element 154 may be joined with the exhaust pipe 120 in any other suitable manner as well without limiting the scope of the present disclosure.

While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments can be contemplated by the modification of the disclosed machines, systems, and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.