Exhaust silencer

Abstract

An exhaust muffler includes a hollow body at least partially housing an exhaust pipe. The exhaust pipe is adapted to allow exhaust gas to flow therethrough. Further, the exhaust pipe defines a plurality of apertures on the exhaust pipe such that exhaust gas flowing through the exhaust pipe can flow out of the exhaust pipe within the hollow body through the plurality of apertures and / or back into the exhaust pipe from the hollow body. The secondary tube is disposed within the hollow body and is filled with a sound absorbing material. At least one baffle is engaged with the exhaust pipe and the secondary pipe to allow at least one of the exhaust pipe and the secondary pipe to pass therethrough.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Indian Application No. 202411067478, filed on September 6, 2024. The entire disclosure of the above-cited application is incorporated herein by reference. Technical Field

[0003] This disclosure relates in general to an exhaust muffler, particularly for suppressing noise caused by exhaust gases emitted from the exhaust system of an internal combustion engine. Background Technology

[0004] Generally speaking, a car's internal combustion engine is equipped with an exhaust system. The exhaust system is used to reduce noise from the engine while releasing exhaust gases. To reduce noise, the exhaust muffler is arranged to limit the path of the exhaust gases, thereby reducing noise.

[0005] Mufflers are typically filled and / or stuffed with roving, particularly glass fiber and / or mineral fiber, widely used for sound insulation and / or attenuation in exhaust systems. With regard to glass fiber, conventional practice involves shredding continuous filament material into short lengths (short fibers), then forming pads from the resulting short fibers, or simply stuffing the short fibers into the support structure. Thus, short fibers are stuffed into the muffler housing. However, these methods of installing and / or encapsulating and / or stuffing glass fiber into mufflers present environmental, health, and safety issues.

[0006] In addition, as an improvement over existing roving filling methods, bagged / brick-shaped rovings are used in mufflers for sound insulation and / or attenuation in exhaust systems. However, these methods are costly and less than ideal.

[0007] U.S. Patent 10,508,580B2 (hereinafter referred to as '580 Reference) provides an example of an improved muffler. '580 Reference provides a combined heat exchanger and exhaust muffler for a vehicle, comprising a bypass valve configured to allow a flow path for exhaust gas to open from inlet to outlet via a bypass pipe with at least partial perforation in a first state, and to close the flow path in a second state, whereby at least a major portion of the exhaust gas is forced through a second flow passage comprising heat exchanger tubes. The second flow passage is formed by an annular gap between a second pipe with at least partial perforation and a third pipe with at least partial perforation. Sound-absorbing material surrounds the bypass pipe and the third pipe, and is also disposed inside the second pipe.

[0008] Another example of an improved muffler is provided in German patent DE 841,834C (hereinafter referred to as '834 reference). '834 reference provides a muffler for an internal combustion engine that effectively suppresses pulsating flow by utilizing internal sound-absorbing pads, thereby allowing for improved sound absorption and acoustic tuning while reducing overall size and cost. Summary of the Invention

[0009] According to one aspect, an exhaust muffler is provided. The exhaust muffler includes a hollow body and an exhaust pipe, the hollow body defining an inlet opening and an outlet opening, the exhaust pipe fluidly connecting the inlet opening to the outlet opening such that the exhaust pipe is at least partially disposed within the hollow body. The exhaust pipe is adapted to allow exhaust gas to flow through it. Furthermore, the exhaust pipe defines a plurality of orifices such that exhaust gas flowing through the exhaust pipe can exit the exhaust pipe within the hollow body through the plurality of orifices and / or flow back into the exhaust pipe from the hollow body. Additionally, a secondary pipe is disposed within the hollow body such that the secondary pipe is filled with a sound-absorbing material. Furthermore, the secondary pipe is disposed within the hollow body in a manner offset from the exhaust pipe. The exhaust muffler also includes at least one baffle such that the baffle is connected to the exhaust pipe to allow the exhaust pipe to pass through it, and the baffle is connected to the secondary pipe to allow the secondary pipe to pass through it.

[0010] An exhaust muffler may advantageously include a silencing device in the form of a secondary tube, which is filled with a sound-absorbing material and further defines a plurality of orifices. The sound-absorbing material may be glass and / or mineral fibers, and / or any other material suitable for sound insulation. The secondary tube is positioned close to the exhaust pipe such that both the secondary tube and the exhaust pipe are at least partially assembled in a compact manner within a hollow body. The exhaust pipe also advantageously has an acoustic flow path to the secondary tube to attenuate high frequencies. In other words, exhaust gas flowing through the exhaust pipe can flow from the exhaust pipe to the secondary tube and from the secondary tube back into the exhaust 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 may be a tube with solid walls and no orifices. In this case, the exhaust flow can travel back and forth through these tubes in the muffler, and at some point, the flow contacts the secondary tube, which also has a plurality of orifices.

[0011] Furthermore, at least one baffle includes a first opening and a second opening, the shapes and sizes of which correspond to the shapes and sizes of the exhaust pipe and the secondary pipe, respectively, such that when the exhaust pipe and the secondary pipe are at least partially disposed within the hollow body, they are securely resting on the first opening and the second opening, respectively. Additionally, at least one baffle removably holds and / or supports the exhaust pipe and the secondary pipe, at least partially within the hollow body, in a desired orientation.

[0012] According to one embodiment of this disclosure, the secondary tube is capped at at least one end. The secondary tube is capped or blocked at one or both ends in a suitable manner to form a semi-enclosed or enclosed system or enclosure for securely and firmly storing the sound-absorbing material within the secondary tube. Furthermore, the second tube may be removably capped to allow for maintenance of the second tube when necessary.

[0013] According to one embodiment of this disclosure, at least one baffle comprises two baffles arranged parallel to each other, such that the exhaust muffler is divided into a first chamber, a second chamber, and a third chamber. Preferably, at least one baffle may be two or more baffles arranged parallel to each other or at a slightly acute angle, without affecting the operation of the exhaust muffler and / or the exhaust flow through the exhaust muffler. Furthermore, the chamber walls of the resulting chambers may also contribute to noise reduction, at least at their edges.

[0014] According to one embodiment of this disclosure, the secondary tube extends across only one of the first, second, and third chambers. According to one embodiment of this disclosure, the secondary tube extends across at least one of the first, second, and third chambers. According to one embodiment of this disclosure, the secondary tube extends across all of the first, second, and third chambers. Among other factors, the secondary tube may selectively cross one or more chambers formed by two baffles arranged parallel to each other within the hollow body, based on the amount of sound-absorbing material to be filled.

[0015] According to one embodiment of this disclosure, the exhaust pipe comprises a two-part structure. The exhaust pipe may have two parts, such that a secondary pipe can be assembled between the two parts of the exhaust pipe structure, thereby giving the exhaust pipe an advantageous acoustic flow path to the secondary pipe to attenuate high frequencies.

[0016] According to one embodiment of this disclosure, the secondary pipe consists of a two-part structure. The exhaust pipe and / or the secondary pipe can be configured as a two-part structure as required to improve the efficiency of the exhaust muffler.

[0017] According to one embodiment of this disclosure, at least one baffle includes an integrally formed recess such that the secondary tube is sealed at at least one end. The secondary tube can be sealed at at least one end using the baffle, particularly the recess of the baffle, so that roving material can be securely stored in the secondary tube.

[0018] Other areas of applicability of this disclosure will become apparent from the detailed description provided below. It should be understood that while the detailed description and specific examples indicate preferred embodiments of this disclosure, they are for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0019] Figure 1This is a schematic diagram of an exhaust muffler according to the first embodiment of this disclosure;

[0020] Figure 2 This is a schematic diagram of an exhaust muffler according to the second embodiment of this disclosure;

[0021] Figure 3 This is a schematic diagram of an exhaust muffler according to the third embodiment of this disclosure;

[0022] Figure 4 This is a schematic diagram of an exhaust muffler according to the fourth embodiment of this disclosure;

[0023] Figure 5 This is a schematic diagram of an exhaust muffler according to the fifth embodiment of this disclosure;

[0024] Figure 6 This is a schematic diagram of an exhaust muffler according to the sixth embodiment of this disclosure;

[0025] Figure 7 A schematic diagram of an exhaust muffler according to a seventh embodiment of this disclosure is illustrated;

[0026] Figure 8 A schematic diagram of an exhaust muffler according to the eighth embodiment of this disclosure is shown;

[0027] Figure 9A and Figure 9B A schematic diagram and a front view of the secondary tube according to the ninth embodiment of this disclosure are shown respectively;

[0028] Figure 10 A schematic diagram of an exhaust muffler according to a tenth embodiment of the present disclosure is shown;

[0029] Figure 11A and Figure 11B A cross-sectional view and a front view of an exhaust pipe according to the eleventh embodiment of this disclosure are illustrated respectively;

[0030] Figure 12 A cross-sectional view of the secondary pipe of an exhaust muffler according to any of the foregoing embodiments of this disclosure is illustrated;

[0031] Figure 13A and Figure 13B An assembled view and an unassembled view of the secondary tube according to the thirteenth embodiment of this disclosure are illustrated respectively;

[0032] Figure 14 A schematic diagram of an exhaust pipe according to the fourteenth embodiment of this disclosure is shown;

[0033] Figure 15A partial cross-sectional view of an exhaust pipe according to the fourteenth embodiment of this disclosure is illustrated;

[0034] Figure 16A A partial perspective view of an exhaust pipe according to the fifteenth embodiment of this disclosure is illustrated; and

[0035] Figure 16B An example is provided according to the fifteenth embodiment of this disclosure. Figure 16A An exploded perspective view of the exhaust pipe. Detailed Implementation

[0036] The following description is merely exemplary in nature and is in no way intended to limit this disclosure, its application, or use. Referring now to the accompanying drawings, similar reference numerals in several views denote similar or corresponding parts. See also Figure 1 , Figure 1 A schematic diagram of an exhaust muffler 100 according to a first embodiment of the present disclosure is illustrated. The exhaust muffler 100 is a muffler connected to the exhaust system of an internal combustion engine via a coupling device. The exhaust fluid (typically air and other exhaust gases) flowing through the exhaust system carries sound waves generated during engine operation. Most of these sound waves are considered undesirable noise that needs to be silenced.

[0037] 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 of any non-corrosive and durable material (e.g., stainless steel). Furthermore, the inlet opening 112 and outlet opening 114 of the hollow body 110 preferably have a circular, elliptical, or trioval cross-section, and preferably have an orientation parallel to each other.

[0038] The exhaust muffler 100 also includes an exhaust pipe 120 that fluidly connects an inlet opening 112 to an outlet opening 114 and is at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The length of the exhaust pipe 120 may be less than, greater than, or equal to the length of the hollow body 110. The exhaust pipe 120 may have a shape similar to or dissimilar to the hollow body 110. The exhaust pipe 120 may be made of a material similar to or dissimilar to the material of the hollow body 110. The exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 may exit the exhaust pipe 120 within the hollow body 110 through the plurality of orifices 122 and / or flow back from the hollow body 110 into the exhaust pipe 120.

[0039] The multiple orifices 122 may be circular, elliptical, triangular, square, rectangular, or any other shape as required. The multiple orifices 122 may have different shapes and sizes as required. The multiple orifices 122 may be arranged along the entire length of the exhaust pipe 120, or may be arranged only in some sections of the exhaust pipe 120. The multiple orifices 122 may be arranged continuously or discretely on the exhaust pipe 120. The multiple orifices 122 may be multiple orifices 122 in different groups spaced apart from each other, such that the orifices 122 in each group may have similar or different sizes.

[0040] In addition, see also Figure 1 The secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with a sound-absorbing material. Without limiting the scope of this disclosure, the sound-absorbing material may be glass fiber, mineral fiber, or any other suitable material. The size of the secondary tube 130 may be smaller, larger, or equal to that of the exhaust pipe 120. Furthermore, the secondary tube 130 may have a shape similar to or dissimilar to that of the exhaust pipe 120. Furthermore, the length of the secondary tube 130 may be less than, greater than, or equal to the length of the hollow body 110. Furthermore, the secondary tube 130 may be made of a material similar to or dissimilar to that of the hollow body 110 and / or the exhaust pipe 120. Preferably, the secondary tube 130 may be made of a high-temperature molded plastic to reduce the weight of the secondary tube 130, thereby reducing the weight of the exhaust muffler 100.

[0041] Furthermore, the secondary pipe 130 is disposed within the hollow body 110 with an orientation that is parallel or non-parallel to the exhaust pipe 120 and / or the hollow body 110. Additionally, the secondary pipe 130 is assembled within the hollow body 110 of the exhaust muffler 100 to be higher than the exhaust pipe 120.

[0042] Furthermore, without limiting the scope of this disclosure, the secondary tube 130 is capped at at least one end in any suitable manner. Additionally, the secondary tube 130 defines a plurality of orifices 132, which may be circular, elliptical, triangular, square, rectangular, or any other shape as required. The plurality of orifices 132 may have different shapes and sizes as required. The plurality of orifices 132 may be provided along the entire length of the secondary tube 130, or may be provided only in some portions of the secondary tube 130. The plurality of orifices 132 may be arranged continuously or discretely on the secondary tube 130. The plurality of orifices 132 may be a plurality of orifices 132 spaced apart from each other, such that the plurality of orifices 132 in each group may have similar or different sizes. The plurality of orifices 132 may have similar or different arrangements, numbers, shapes, and sizes from the plurality of orifices 122.

[0043] In addition, exhaust gas flowing through exhaust pipe 120 can flow out of exhaust pipe 120 through multiple orifices 132 into secondary pipe 130 within hollow body 110 and contact the sound-absorbing material filled or packed in secondary pipe 130, and / or subsequently flow back into exhaust pipe 120 through multiple orifices 122.

[0044] Further, see also Figure 1 The exhaust muffler 100 also includes at least one baffle 140. The at least one baffle 140 is fixedly or removably coupled to the hollow body 110 in any manner known in the relevant art. The at least one baffle 140 defines a first opening 142 to allow an exhaust pipe 120 to pass through it, and further supports the exhaust pipe 120 within the hollow body 110. In other words, the baffle 140 is connected to the exhaust pipe 120 to allow the exhaust pipe 120 to pass through it. Furthermore, the at least one baffle 140 defines a second opening 144 to allow a secondary pipe 130 to pass through it, and further supports the secondary pipe 130 within the hollow body 110. In other words, the baffle 140 is connected to the secondary pipe 130 to allow the secondary pipe 130 to pass through it. The first opening 142 and the second opening 144 each have a shape and size similar to the shape and cross-section of the exhaust pipe 120 and the secondary pipe 130, and may also have corresponding orientations similar to the orientations of the exhaust pipe 120 and the secondary pipe 130.

[0045] Furthermore, at least one baffle 140 includes two similar baffles 140 arranged 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 includes a first opening 142 configured to allow an exhaust pipe 120 to pass through it and a second opening 144 configured to allow a secondary pipe 130 to pass through it. Additionally, depending on the functional requirements of the exhaust muffler 100, the first chamber 102, the second chamber 104, and the third chamber 106 may have similar or dissimilar volumes within the hollow body 110. In other words, the first chamber 102, the second chamber 104, and the third chamber 106 may divide the exhaust muffler 100 and / or the hollow body 110 into three equal or unequal halves.

[0046] Furthermore, in this embodiment, the secondary tube 130 extends across at least one of the first chamber 102, the second chamber 104, and the third chamber 106. Specifically, the secondary tube 130 extends completely across the second chamber 104 and at least partially across the first chamber 102 and the third chamber 106, wherein the extension across the first chamber 102 is equal to the extension across the third chamber 106.

[0047] Figure 2A schematic diagram of an exhaust muffler 100 according to a second embodiment of the present disclosure is illustrated. The exhaust muffler 100 of the second embodiment includes components similar to those of the exhaust muffler 100 of the first embodiment. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The exhaust muffler 100 also includes an exhaust pipe 120 fluidly connecting the inlet opening 112 to the outlet opening 114 and being at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 through the plurality of orifices 122 and / or flow back from the hollow body 110 into the exhaust pipe 120.

[0048] Furthermore, the secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with sound-absorbing material. Furthermore, the secondary tube 130 is disposed within the hollow body 110 offset from the exhaust pipe 120. Furthermore, the secondary tube 130 is assembled within the hollow body 110 of the exhaust muffler 100 to be higher than the exhaust pipe 120. Furthermore, the secondary tube 130 is capped at at least one end. Furthermore, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the exhaust pipe 120 can flow through the plurality of orifices 132 within the hollow body 110 toward the secondary tube 130 and contact the sound-absorbing material filling or plugging the secondary tube 130, and / or subsequently flow back into the exhaust pipe 120 through the plurality of orifices 122.

[0049] Further, see also Figure 2 The exhaust muffler 100 also includes at least one baffle 140 defining a first opening 142 to allow an exhaust pipe 120 to pass through and a second opening 144 to allow a secondary pipe 130 to pass through. The at least one baffle 140 includes two similar baffles 140 arranged 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, wherein each of the two baffles 140 includes a first opening 142 configured to allow the exhaust pipe 120 to pass through and a second opening 144 configured to allow the secondary pipe 130 to pass through.

[0050] Furthermore, 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. Specifically, the secondary pipe 130 extends across only the third chamber 106 and / or the hollow body 110 of the exhaust muffler 100.

[0051] Figure 3A schematic diagram of an exhaust muffler 100 according to a third embodiment of the present disclosure is illustrated. The exhaust muffler 100 of the third embodiment includes components similar to those of the exhaust muffler 100 of any of the foregoing embodiments. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The exhaust muffler 100 also includes an exhaust pipe 120 fluidly connecting the inlet opening 112 to the outlet opening 114 and being at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 may flow through the plurality of orifices 122 out of the exhaust pipe 120 within the hollow body 110 and / or flow from the hollow body 110 back into the exhaust pipe 120.

[0052] Furthermore, the secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with sound-absorbing material. Furthermore, the secondary tube 130 is disposed within the hollow body 110 offset from the exhaust pipe 120. Furthermore, the secondary tube 130 is assembled within the hollow body 110 of the exhaust muffler 100 to be higher than the exhaust pipe 120. Furthermore, the secondary tube 130 is capped at at least one end. Furthermore, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the exhaust pipe 120 can flow through the plurality of orifices 132 within the hollow body 110 toward the secondary tube 130 and contact the sound-absorbing material filling or plugging the secondary tube 130, and / or subsequently flow back into the exhaust pipe 120 through the plurality of orifices 122.

[0053] Further, see also Figure 3 The exhaust muffler 100 also includes at least one baffle 140 defining a first opening 142 to allow an exhaust pipe 120 to pass through and a second opening 144 to allow a secondary pipe 130 to pass through. The at least one baffle 140 includes two similar baffles 140 arranged 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, wherein each of the two baffles 140 includes a first opening 142 configured to allow the exhaust pipe 120 to pass through and a second opening 144 configured to allow the secondary pipe 130 to pass through.

[0054] Furthermore, 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. Specifically, 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.

[0055] Figure 4A schematic diagram of an exhaust muffler 100 according to a fourth embodiment of the present disclosure is illustrated. The exhaust muffler 100 of the fourth embodiment includes components similar to those of the exhaust muffler 100 of any of the foregoing embodiments. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The exhaust muffler 100 also includes an exhaust pipe 120 fluidly connecting the inlet opening 112 to the outlet opening 114 and being at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 may flow through the plurality of orifices 122 out of the exhaust pipe 120 within the hollow body 110 and / or flow from the hollow body 110 back into the exhaust pipe 120.

[0056] Furthermore, the secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with sound-absorbing material. Furthermore, the secondary tube 130 is disposed within the hollow body 110 offset from the exhaust pipe 120. Furthermore, the secondary tube 130 is assembled within the hollow body 110 of the exhaust muffler 100 to be higher than the exhaust pipe 120. Furthermore, the secondary tube 130 is capped at at least one end. Furthermore, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the exhaust pipe 120 can flow through the plurality of orifices 132 within the hollow body 110 toward the secondary tube 130 and contact the sound-absorbing material filling or plugging the secondary tube 130, and / or subsequently flow back into the exhaust pipe 120 through the plurality of orifices 122.

[0057] Further, see also Figure 4 The exhaust muffler 100 also includes at least one baffle 140 defining a first opening 142 to allow an exhaust pipe 120 to pass through and a second opening 144 to allow a secondary pipe 130 to pass through. The at least one baffle 140 includes two similar baffles 140 arranged 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, wherein each of the two baffles 140 includes a first opening 142 configured to allow the exhaust pipe 120 to pass through and a second opening 144 configured to allow the secondary pipe 130 to pass through.

[0058] Furthermore, in this embodiment, the secondary tube 130 extends across at least one of the first chamber 102, the second chamber 104, and the third chamber 106. Specifically, the secondary tube 130 extends completely across the second chamber 104 and at least partially across the first chamber 102 and the third chamber 106, wherein the extension across the first chamber 102 is greater than the extension across the third chamber 106.

[0059] Figure 5 A schematic diagram of an exhaust muffler 100 according to a fifth embodiment of the present disclosure is illustrated. The exhaust muffler 100 of the fifth embodiment includes components similar to those of the exhaust muffler 100 of any of the foregoing embodiments. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The exhaust muffler 100 also includes an exhaust pipe 120 fluidly connecting the inlet opening 112 to the outlet opening 114 and being at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 may flow through the plurality of orifices 122 out of the exhaust pipe 120 within the hollow body 110 and / or flow from the hollow body 110 back into the exhaust pipe 120.

[0060] Furthermore, the secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with sound-absorbing material. Furthermore, the secondary tube 130 is disposed within the hollow body 110 offset from the exhaust pipe 120. Furthermore, the secondary tube 130 is assembled within the hollow body 110 of the exhaust muffler 100 to be higher than the exhaust pipe 120. Furthermore, the secondary tube 130 is capped at at least one end. Furthermore, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the exhaust pipe 120 can flow through the plurality of orifices 132 within the hollow body 110 toward the secondary tube 130 and contact the sound-absorbing material filling or plugging the secondary tube 130, and / or subsequently flow back into the exhaust pipe 120 through the plurality of orifices 122.

[0061] Further, see also Figure 5 The exhaust muffler 100 also includes at least one baffle 140 defining a first opening 142 to allow an exhaust pipe 120 to pass through and a second opening 144 to allow a secondary pipe 130 to pass through. The at least one baffle 140 includes two similar baffles 140 arranged 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, wherein each of the two baffles 140 includes a first opening 142 configured to allow the exhaust pipe 120 to pass through and a second opening 144 configured to allow the secondary pipe 130 to pass through.

[0062] Furthermore, 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. Specifically, the secondary pipe 130 extends across only the second chamber 104 and / or the hollow body 110 of the exhaust muffler 100.

[0063] Figure 6A schematic diagram of an exhaust muffler 100 according to a sixth embodiment of the present disclosure is illustrated. The exhaust muffler 100 of the sixth embodiment includes components similar to those of the exhaust muffler 100 of any of the foregoing embodiments. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. The exhaust muffler 100 also includes an exhaust pipe 120 fluidly connecting the inlet opening 112 to the outlet opening 114 and being at least partially disposed within the hollow body 110. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 of this embodiment is constructed of two parts such that the two parts are offset from each other. Furthermore, the exhaust pipe 120 defines a plurality of orifices 122 such that exhaust gas flowing through the exhaust pipe 120 can flow out of the exhaust pipe 120 within the hollow body 110 through the plurality of orifices 122 and / or flow back from the hollow body 110 into the exhaust pipe 120.

[0064] Furthermore, the secondary tube 130 is disposed within the hollow body 110, such that the secondary tube 130 is filled with sound-absorbing material. Furthermore, the secondary tube 130 is disposed within the hollow body 110 in a manner offset from the exhaust pipe 120. Furthermore, the secondary tube 130 is assembled between the two structural parts of the exhaust pipe 120 within the hollow body 110 of the exhaust muffler 100. Furthermore, the secondary tube 130 is capped at at least one end. Furthermore, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the exhaust pipe 120 can flow through the plurality of orifices 132 within the hollow body 110 toward the secondary tube 130 and contact the sound-absorbing material filling or plugging the secondary tube 130, and / or subsequently flow back into the exhaust pipe 120 through the plurality of orifices 122, as... Figure 6 As shown by the arrow in the image.

[0065] Further, see also Figure 6 The exhaust muffler 100 also includes at least one baffle 140 defining a first opening 142 to allow an exhaust pipe 120 to pass through and a second opening 144 to allow a secondary pipe 130 to pass through. The at least one baffle 140 includes two similar baffles 140 arranged 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, wherein each of the two baffles 140 includes a first opening 142 configured to allow the exhaust pipe 120 to pass through and a second opening 144 configured to allow the secondary pipe 130 to pass through. Furthermore, in this embodiment, the secondary pipe 130 extends across the entirety of the first chamber 102, the second chamber 104, and the third chamber 106.

[0066] According to another embodiment of this disclosure, the secondary pipe 130 may also be composed of two parts. The exhaust pipe 120 and / or the secondary pipe 130 may be composed of two parts depending on the application requirements to improve the efficiency of the exhaust muffler 100.

[0067] Figure 7 A schematic diagram of an exhaust muffler 100 according to a seventh embodiment of the present disclosure is illustrated. According to this embodiment, the secondary pipe 130 is sealed at both ends with two separate caps 134, which are respectively connected to both ends of the secondary pipe 130, preferably engaging with both ends of the secondary pipe via a snap-fit ​​mechanism.

[0068] Figure 8 A schematic diagram of an exhaust muffler 100 according to an eighth embodiment of the present disclosure is illustrated. According to this embodiment, a secondary pipe 130 is capped at both ends by two baffles 140, each baffle having a recess 146 or depression 146 that at least partially penetrates into the secondary pipe 130 via the respective end of the secondary pipe 130. The recess 146 or depression 146 is configured to block both ends of the secondary pipe 130. In other words, at least one baffle 140 includes an integrally formed recess 146 such that the secondary pipe 130 is capped at at least one end by means of the recess 146. The recess 146 forms a second opening 144 in each of the retaining supports 130. However, the recess 146 may also form a first opening 142 in each of the retaining supports 130.

[0069] Figure 9A and Figure 9B A schematic diagram and a front view of the secondary tube 130 according to the ninth embodiment of this disclosure are shown respectively. According to this embodiment, the secondary tube 130 is capped at both ends by crimping.

[0070] Figure 10 A schematic diagram of an exhaust muffler 100 according to a tenth embodiment of the present disclosure is illustrated. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. In this embodiment, the hollow body 110 is functionally configured to serve as an exhaust pipe 120 and is adapted to allow exhaust gas to flow through it. Furthermore, a secondary pipe 130 is disposed within the hollow body 110 using at least one retaining bracket 148 disposed therein. The at least one retaining bracket 148 includes an aperture 150 to allow the secondary pipe 130 to pass through it. Additionally, the at least one retaining bracket 148 includes at least one slit 152 upstream and downstream of the aperture 150 to allow exhaust gas to pass through it. In an alternative embodiment, the at least one retaining bracket 148 may have a plurality of orifices or perforations extending through the surface of the at least one retaining bracket 148. However, the at least one retaining bracket 148 may have any other design as required.

[0071] Furthermore, the secondary tube 130 is filled with a sound-absorbing material. Without limiting the scope of this disclosure, the sound-absorbing material may be glass fiber, mineral fiber, or any other suitable material. The secondary tube 130 is sealed at both ends with two separate caps 134, which are respectively connected to both ends of the secondary tube 130, preferably engaging with the ends of the secondary tube. Additionally, the secondary tube 130 defines a plurality of orifices 132, such that exhaust gas flowing through the hollow body 110 can flow through the orifices 132 to the secondary tube 130 and contact the sound-absorbing material filling or bridging the secondary tube 130.

[0072] Figure 11A and Figure 11B A cross-sectional view and a front view of an exhaust pipe 120 according to an eleventh embodiment of the present disclosure are illustrated, respectively. The exhaust pipe 120 is adapted to allow exhaust gas to flow through it. The exhaust pipe 120 includes two concentric secondary pipes 130, each having a plurality of orifices 132. The two concentric secondary pipes 130 define an annular space "S" between them, such that sound-absorbing material or roving is filled in the annular space "S". The sound-absorbing material or roving filling is held in place by end caps 134' having an annular profile and disposed at both ends of the sound-absorbing material or roving filling in the annular space "S".

[0073] Figure 12 A cross-sectional view of a secondary pipe 130 of an exhaust muffler 100 according to any of the foregoing embodiments of the present disclosure is illustrated. The secondary pipe 130, having an orifice 132, is filled with a sound-absorbing material. Without limiting the scope of the present disclosure, the sound-absorbing material may be glass fiber, mineral fiber, or any other suitable material. The sound-absorbing material is configured to suppress noise caused by exhaust gas flowing through the exhaust pipe 120.

[0074] Figure 13A and Figure 13B An assembled view and an unassembled view of the auxiliary conduit 130' according to the thirteenth embodiment of this disclosure are illustrated respectively. The exhaust muffler 100 includes a hollow body 110 defining an inlet opening 112 and an outlet opening 114. In this embodiment, the hollow body 110 is functionally configured to serve as an exhaust pipe 120 and is adapted to allow exhaust gas to flow through it. Furthermore, a secondary pipe 130' is disposed within the hollow body 110 such that it at least partially receives exhaust gas flowing within the hollow body 110 of the aftertreatment component 100. The secondary pipe 130' is filled with a sound-absorbing material and defines a plurality of orifices 132'.

[0075] Furthermore, the secondary tube 130' includes a first surface 131, a second surface 133, and a third surface 135, which are joined together only by folding relative to each other. Each of the first surface 131, the second surface 133, and the third surface 135 of the secondary tube 130' includes a plurality of orifices 132'. Additionally, the second surface 133 of the secondary tube 130' includes triangular protrusions 136, 137 at opposite ends, while each of the first surface 131 and the third surface 135 includes triangular protrusions 138, 139, and each includes a substantially curved protrusion 141 at opposite ends, such that the substantially curved protrusion 141 of the first surface 131 is diagonally opposite to the substantially curved protrusion 141 of the third surface 135. Similarly, the triangular protrusion 138 of the first surface 131 is diagonally opposite to the triangular protrusion 139 of the third surface 135. Furthermore, the substantially curved protrusions 141 of the first surface 131 and the third surface 135 are respectively configured as retaining structures for the secondary pipe 130' within the hollow body 110. In addition, the substantially curved protrusions 141 respectively have slits or other means to allow exhaust gas to enter and exit from the secondary pipe 130'.

[0076] Figure 14 A schematic diagram of an exhaust pipe 120 according to a fourteenth embodiment of the present disclosure is illustrated. The exhaust pipe 120 has a curved cross-section and includes a plurality of orifices 122 at a portion or certain locations of that portion. Furthermore, downstream of the exhaust pipe 120 is a secondary pipe 130 filled with sound-absorbing material or roving to attenuate noise generated by the exhaust. In other words, the secondary pipe 130 is formed integrally with or separately from the exhaust pipe 120 and is positioned downstream of the exhaust pipe 120 in the direction of exhaust flow. For example, in the case where the secondary pipe 130 is formed separately from the exhaust pipe 120, a baffle is placed between the secondary pipe 130 and the exhaust pipe 120. (Baffle) Figure 14 The baffle (not shown) can be partially or fully perforated. Furthermore, the baffle can be a circular body connected from the interior of the exhaust muffler 100 to the exhaust muffler 100, such that the baffle includes a circular opening configured to retain and / or allow connection between the exhaust pipe 120 and the secondary pipe 130. Sound-absorbing material or roving is inserted into the space formed between the baffle and a cap 134 (also not shown) located at the end of the secondary pipe 130 to attenuate noise generated by the exhaust. Furthermore, the secondary pipe 130 includes a plurality of orifices 132 located at a portion or throughout the secondary pipe 130. The orifices 132 can be located at a 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 located on opposite sides of the secondary pipe 130 where it can be blocked, or terminated in another baffle.

[0077] Figure 15A partial cross-sectional view of an exhaust pipe 120 according to a fourteenth embodiment of the present disclosure is illustrated. The exhaust pipe 120 has a curved cross-section and includes a plurality of orifices 122 at a portion or certain locations of that portion. Furthermore, downstream of the exhaust pipe 120 is a secondary pipe 130 filled with sound-absorbing material or roving to attenuate noise generated by the exhaust. In other words, the secondary pipe 130 is formed integrally or separately from the exhaust pipe 120 and is positioned downstream of the exhaust pipe 120 in the direction of exhaust flow.

[0078] Figure 16A A schematic diagram of an exhaust pipe 120 according to a fifteenth embodiment of the present disclosure is illustrated. The exhaust pipe 120 has a curved cross-section and includes a plurality of orifices 122 at a portion or certain locations of the exhaust pipe 120. Furthermore, downstream of the exhaust pipe 120 is a secondary pipe 130. The secondary pipe 130 surrounds a mixing element 154. Figure 16B An exploded view of exhaust pipe 120 is shown, with mixing element 154 located outside exhaust pipe 120. See also [reference needed]. Figure 16A and Figure 16B The mixing element 154 is completely surrounded by the secondary tube 130. The mixing element 154 includes a first plate 156 and a second plate 158 connected together by a plurality of connecting elements 160. In the illustrated embodiment, the first plate 156 and the second plate 158 are joined together by three connecting elements. However, the first plate 156 and the second plate 158 may also be joined together by any other suitable number of connecting elements 160. 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 to the secondary tube 130. More specifically, the second plate 158 may be resistance welded to the end of the secondary tube 130. Without limiting the scope of this disclosure, the mixing element 154 may also be joined to the exhaust pipe 120 in any other suitable manner.

[0079] While various aspects of this disclosure have been specifically shown and described with reference to the above embodiments, those skilled in the art will understand that various additional embodiments can be conceived through modifications to the disclosed machinery, systems, and methods without departing from the spirit and scope of the disclosure. Such embodiments should be understood to fall within the scope of this disclosure as defined by the claims and any equivalents.

Claims

1. An exhaust silencer, the exhaust silencer comprising: a hollow body defining an inlet opening and an outlet opening; an exhaust pipe fluidly coupling the inlet opening to the outlet opening and at least partially disposed within the hollow body, wherein the exhaust pipe is adapted to allow exhaust gas to flow therethrough, wherein the exhaust pipe defines a plurality of apertures thereon such that the exhaust gas flowing through the exhaust pipe can flow out of the exhaust pipe within the hollow body through the plurality of apertures and / or back into the exhaust pipe from the hollow body; a secondary pipe disposed within the hollow body, wherein the secondary pipe is filled with sound absorbing material; and at least one baffle, wherein the baffle is engaged with the exhaust pipe and the secondary pipe to allow at least one of the exhaust pipe and the secondary pipe to pass therethrough.

2. The exhaust silencer of claim 1, wherein the secondary pipe is capped at least at one end.

3. The exhaust silencer of claim 1, wherein the at least one baffle comprises two baffles disposed parallel to each other such that the exhaust silencer is divided into a first chamber, a second chamber, and a third chamber.

4. The exhaust silencer of claim 3, wherein the secondary pipe extends across only one of the first chamber, the second chamber, and the third chamber.

5. The exhaust silencer of claim 3, wherein the secondary pipe extends across at least one of the first chamber, the second chamber, and the third chamber.

6. The exhaust silencer of claim 3, wherein the secondary pipe extends across all of the first chamber, the second chamber, and the third chamber.

7. The exhaust silencer of claim 1, wherein the exhaust pipe is constructed of two parts.

8. The exhaust silencer of claim 1, wherein the secondary pipe is constructed of two parts.

9. The exhaust silencer of claim 1, wherein the at least one baffle comprises an integrally formed recess such that the secondary pipe is capped at least at one end.

10. The exhaust silencer of claim 1, wherein the secondary pipe is engaged with the exhaust pipe.

Images