Baffle assembly

Abstract

An inlet chamber includes an inlet defining an inlet axis that is configured to receive exhaust, a sidewall extending around a center axis, and an end wall coupled to the sidewall such that the center axis extends through the end wall. The sidewall and the end wall define an internal volume. The inlet chamber also includes a baffle assembly that is coupled to the end wall and extends into the internal volume. The baffle assembly includes a flat strip that has one or more elongated portions extending in a length direction, and one or more notches extending from the elongated portions in a direction transverse to the center axis and to the length direction.

Description

BAFFLE ASSEMBLYCROSS-REFERENCE TO RELATED APPLICATION

[0001] This PCT Application claims the benefit of and priority to Indian Provisional Patent Application No. 202441028712, filed April 8, 2024, which is incorporated herein by reference in its entirety and for all purposes.TECHNICAL FIELD

[0002] The present disclosure relates generally to a baffle assembly for an inlet chamber of an aftertreatment system for an internal combustion engine.BACKGROUND

[0003] Nitrogen oxide (e.g., NOx) compounds are contained in exhaust of internal combustion engines, such as diesel engines. It is desirable to reduce NOx emissions, for example, to comply with environmental regulations via an aftertreatment system.Aftertreatment systems include a variety of components such as filters, catalyst members, and mixers for reducing contaminants in the exhaust. Exhaust is received from the engine and directed into the aftertreatment system through the filters, catalyst members, and mixers where the exhaust is treated. To reduce NOx emissions, the exhaust aftertreatment system injects reductant into the exhaust. The reductant facilitates conversion of a portion of the exhaust into non-NOx emissions, such as nitrogen (e.g., N2), carbon dioxide (e.g., CO2), and water (e.g., H2O), thereby reducing NOx emissions.SUMMARY

[0004] In one embodiment, an inlet chamber includes an inlet defining an inlet axis. The inlet is configured to receive exhaust. The inlet chamber also includes a sidewall that extends around a center axis and an end wall coupled to the sidewall such that the center axis extends through the end wall. The sidewall and the end wall define an internal volume. The inlet chamber also includes a baffle assembly. The baffle assembly is coupled to the end wall and extends from the end wall into the internal volume. The baffle assembly includes a flat stripthat has one or more elongated portions extending in a length direction and one or more notches that extend in a direction transverse to the center axis and to the length direction.

[0005] In some embodiments, which may be combined with any of the above embodiments in any combination, the one or more notches comprise a plurality of notches, and one of the one or more elongated portions extends between each adjacent pair of the one or more notches.

[0006] In some embodiments, which may be combined with any of the above embodiments in any combination, each of the one or more notches include a first extension portion contiguous with a first of the one or more elongated portions and extending in the direction transverse to the center axis, a second extension portion contiguous with a second of the one or more elongated portions and extending in the direction transverse to the center axis, and a bridge portion contiguous with each of the first extension portion and the second extension portion, the bridge portion extending between the first extension portion and the second extension portion.

[0007] In some embodiments, which may be combined with any of the above embodiments in any combination, each of the one or more notches further includes a first extension portion contiguous with a first of the one or more elongated portions and extending in the direction transverse to the center axis, a second extension portion contiguous with a second of the one or more elongated portions and extending in the direction transverse to the center axis, a first slanted portion extending away from an end of the first extension portion; a third extension portion extending away from an end of the first slanted portion in the direction transverse to the center axis, a second slanted portion extending away from an end of the second extension portion, a fourth extension portion extending away from an end of the second slanted portion in the direction transverse to the center axis, and a bridge portion contiguous with each of the third extension portion and the fourth extension portion, the bridge portion extending between the third extension portion and the fourth extension portion.

[0008] In some embodiments, which may be combined with any of the above embodiments in any combination, the first slanted portion extends away from the first extension portion at an angle in a range between 120 and 150 degrees relative to the first extension portion.

[0009] In some embodiments, which may be combined with any of the above embodiments in any combination, the second slanted portion extends away from the second extension portion at an angle in a range between 120 and 150 degrees relative to the second extension portion.

[0010] In some embodiments, which may be combined with any of the above embodiments in any combination, the inlet chamber is further including a perforated plate positioned in the internal volume a distance away from and downstream of the baffle assembly and coupled to the sidewall such that the center axis extends through the perforated plate, the perforated plate defining a plurality of through-holes.

[0011] In some embodiments, which may be combined with any of the above embodiments in any combination, the flat strip defines a plurality of through-holes facilitating a first portion of flow in the direction transverse to the center axis and the one or more elongated portions facilitating a second portion of flow in a direction parallel to the center axis.

[0012] In some embodiments, which may be combined with any of the above embodiments in any combination, an aftertreatment system includes a housing defining a housing center axis, the housing having a housing first end, and the inlet chamber. The inlet chamber being coupled to the housing first end.

[0013] In some embodiments, which may be combined with any of the above embodiments in any combination, an aftertreatment system further includes a diesel oxidation catalyst member and a diesel particulate filter positioned in the housing downstream of the inlet chamber, the diesel oxidation catalyst member in fluid receiving communication with an inlet chamber outlet of the inlet chamber.

[0014] In some embodiments, which may be combined with any of the above embodiments in any combination, an aftertreatment system further includes a mixer positioned in the housingdownstream of the diesel particulate filter, and in fluid receiving communication with the diesel particulate filter, and an outlet chamber positioned in the housing downstream of the mixer. The outlet chamber in fluid receiving communication with the mixer.

[0015] In another embodiment, a baffle assembly for an aftertreatment system includes a flat strip having a plurality of elongated portions extending in a length direction. The plurality of elongated portions including a first elongated portion and a second elongated portion. The aftertreatment system also includes one or more tabs extending from the flat strip. The one or more tabs are configured to facilitate coupling of the baffle assembly to an inlet chamber of the aftertreatment system, and a first notch that extends in a direction transverse to the length direction. The first notch comprising a first notch first extension portion contiguous with the first elongated portion and extending in the direction transverse to the length direction a first notch second extension portion contiguous with the second elongated portion and extending in the direction transverse to the length direction, and a first notch bridge portion extending between the first notch first extension portion and the first notch second extension portion.

[0016] In some embodiments, which may be combined with any of the above embodiments in any combination, the baffle assembly further includes a first slanted portion extending away from an end of the first elongated portion at a first angle, the first angle being in a range between 30 degrees and 60 degrees relative to the flat strip; and a second slanted portion extending away from an end of the third elongated portion at a second angle, the second angle being in a range between 30 degrees and 60 degrees relative to the flat strip.

[0017] In some embodiments, which may be combined with any of the above embodiments in any combination, a length of each of the first notch bridge portion and the second notch bridge portion, in a direction parallel to the length direction, is in a range between 15mm and 30mm.

[0018] In some embodiments, which may be combined with any of the above embodiments in any combination, a length of each of the first notch first extension portion, the first notch second extension portion, the second notch first extension portion, and the second notch secondextension portion, in a direction perpendicular to the length direction, is in a range between 10mm and 20mm.

[0019] In some embodiments, which may be combined with any of the above embodiments in any combination, the one or more tabs includes a first tab extending in a first direction that is transverse to the length direction, and a second tab extending in a second direction that is transverse to the length direction and opposite the first direction.

[0020] In some embodiments, which may be combined with any of the above embodiments in any combination, the one or more tabs includes a first tab extending in a first direction that is transverse to the length direction, and a second tab extending in a second direction that is transverse to the length direction and opposite the first direction.

[0021] In yet another embodiment, an aftertreatment system includes a housing defining a center axis, and an inlet chamber coupled to the housing. The inlet chamber includes an inlet defining an inlet axis transverse to the center axis. The inlet is configured to receive exhaust. The inlet chamber includes a sidewall extending around a center axis and coupled to the housing, and an end wall coupled to the sidewall such that the center axis extends through the end wall. The sidewall and the end wall defining an internal volume. The inlet chamber also includes a first baffle assembly coupled to the end wall and extending from the end wall into the internal volume. The first baffle assembly includes a first flat strip having a plurality of elongated portions extending in a length direction and is configured to facilitate exhaust flow in a direction parallel to the center axis. The first flat strip defining a plurality of through-holes that facilitate flow in a direction parallel to the inlet axis, and one or more first notches that extend in a direction transverse to the center axis and to the length direction. The baffle assembly also includes a second baffle assembly coupled to the end wall and extending from the end wall into the internal volume. The second baffle assembly is positioned a distance offset from the first baffle assembly along the inlet axis in a direction away from the inlet and includes a second flat strip having a plurality of elongated portions extending in a length direction and configured to facilitate exhaust flow in the direction parallel to the center axis,and one or more second notches that extend in a direction transverse to the center axis and to the length direction.

[0022] In some embodiments, which may be combined with any of the above embodiments in any combination, each of the one or more first notches and the one or more second notches includes: a first extension portion contiguous with a first elongated portion among the plurality of elongated portions of the respective flat strip, and a second extension portion contiguous with a second elongated portion among the plurality of elongated portions of the respective flat strip, and a bridge portion extending between the first extension portion and the second extension portion.

[0023] In some embodiments, which may be combined with any of the above embodiments in any combination, each of the first baffle assembly and the second baffle assembly is expandable between a first position and a second position; a gap distance is defined between an end of the first extension portion that is contiguous with the first elongated portion and an end of the second extension portion that is contiguous with the second elongated portion; and the gap distance when the first baffle assembly and the second baffle assembly are in the second position is greater than the gap distance when the first baffle assembly and the second baffle assembly are in the first position.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The disclosure will become more fully understood from the following detailed description, taken in conjunction with the accompanying Figures, wherein like reference numerals refer to like elements unless otherwise indicated, in which:

[0025] FIG. l is a side view of an aftertreatment system, according to an embodiment;

[0026] FIG. 2 is a cross-sectional view of a portion of the aftertreatment system of FIG. 1;

[0027] FIG. 3A is a cross-sectional view of another portion of the aftertreatment system ofFIG. 1;

[0028] FIG. 3B is another cross-sectional view of a portion of the aftertreatment system of FIG. 1;

[0029] FIG. 4 is a perspective view of a baffle assembly for an aftertreatment system, according to an embodiment;

[0030] FIG. 5 is a side view of the baffle assembly of FIG. 4;

[0031] FIG. 6 is a perspective view of another baffle assembly for an aftertreatment system, according to an embodiment;

[0032] FIG. 7 is a side view of the baffle assembly of FIG. 6;

[0033] FIG. 8 is a perspective view of another baffle assembly for an aftertreatment system, according to an embodiment;

[0034] FIG. 9 is a side view of the baffle assembly of FIG. 8;

[0035] FIG. 10 is a perspective view of another baffle assembly for an aftertreatment system, according to an embodiment; and

[0036] FIG. 11 is a side view of the baffle assembly of FIG. 10.

[0037] It will be recognized that the Figures are schematic representations for purposes of illustration. The Figures are provided for the purpose of illustrating one or more implementations with the explicit understanding that the Figures will not be used to limit the scope or the meaning of the claims.DETAILED DESCRIPTION

[0038] Following below are more detailed descriptions of various concepts related to, and implementations of, methods, apparatuses, and for providing an inlet chamber including a baffle assembly for an exhaust gas aftertreatment system (e.g., or simply an “aftertreatment system”) of an internal combustion engine. The various concepts introduced above anddiscussed in greater detail below may be implemented in any of a number of ways, as the described concepts are not limited to any particular manner of implementation. Examples of specific implementations and applications are provided primarily for illustrative purposes.I. Overview

[0039] Internal combustion engines (e.g., diesel internal combustion engines, etc.) produce exhaust that contains constituents, such as NOx, N2, CO2, and / or H2O. In some applications, an exhaust gas aftertreatment system is utilized to dose the exhaust gas with a reductant so as to reduce NOXemissions in the exhaust gas.

[0040] In order to accommodate the components of an internal combustion engine system, the exhaust may need to be redirected by an aftertreatment system. In some applications, an inlet of an inlet chamber of the aftertreatment system receives exhaust from an upstream conduit that is centered on an axis that is angled relative to an axis on which the inlet of the inlet chamber is centered on. The inlet chamber then provides exhaust to a housing. Within the inlet chamber, the exhaust may be redirected to flow in a direction coincident with a center axis of the housing. The inlet chamber includes at least one baffle assembly to direct flow of the exhaust. Additionally, the at least one baffle assembly is utilized to provide a target flow distribution of the exhaust into the housing. The inlet chamber may expand and contract due to temperature changes of the aftertreatment system and also experience vibrations from various components of the aftertreatment system. Temperature changes and vibrations may impart stress on components such as the baffle assembly.

[0041] Implementations herein are related to an aftertreatment system that include an inlet chamber. An inlet of the inlet chamber is centered on an axis that is angled relative to an axis on which the inlet of the inlet chamber is centered. The inlet receives exhaust from an upstream conduit and provides exhaust to an internal volume of the inlet chamber. The inlet chamber includes a baffle assembly that is positioned within the internal volume and redirects flow towards the housing. The baffle assembly includes a flat strip that has one or more elongated portions and one or more notches that extend in a direction transverse to a center axis of the housing. Gaps are formed along the length of the baffle assembly between adjacent pairs ofelongated portions where the notches are positioned. During operation of the vehicle, the engine system vibrates and is exposed to various temperatures changes. The notches contract and expand to minimize stress on the baffle assembly. When the temperature of the system increases, the notch expands increasing the gap between the elongated portions. Instead, when the temperature of the system decreases, the notch contracts decreasing the gap between the elongated portions. Similarly, when the system vibrates (e.g., due to the operation of various components, environmental conditions, etc.), the notches expand or contract increasing or decreasing the gap to accommodate the movement of the system.II. Overview of Example Aftertreatment Systems

[0042] FIG. 1 illustrates an aftertreatment system 100 for an internal combustion engine system. The aftertreatment system 100 includes a housing 102. The housing 102 is configured to house a plurality of exhaust aftertreatment components.

[0043] The housing 102 defines a center axis Ac (e.g., a housing center axis, etc.). The center axis Ac extends longitudinally through the housing 102.

[0044] The aftertreatment system 100 includes an inlet 106 (e.g., an inlet port, etc.) and an inlet chamber 104. The inlet 106 is positioned on a circumferential edge of the inlet chamber 104. The inlet 106 is configured to receive flow from an upstream conduit (e.g., from the engine, etc.) and provide flow (e.g., exhaust gas, air, etc.) to the aftertreatment system 100. The inlet chamber 104 is coupled to a first end of the housing 102. For example, the inlet chamber 104 may be coupled to an upstream end of the housing 102. The inlet chamber 104 is configured to receive flow from the inlet 106 and provide flow to the housing 102. The inlet chamber 104 also includes an inlet chamber outlet 107. The inlet chamber outlet 107 is centered along the center axis Ac. The inlet chamber outlet 107 provides flow from the inlet chamber 104 to the housing 102.

[0045] For example, the inlet 106 provides flow to the inlet chamber 104 and inlet chamber 104 provides flow to the housing 102.

[0046] The inlet 106 defines an inlet axis Ai. The inlet 106 is centered about the inlet axis Ai. The inlet axis Ai extends longitudinally through the inlet 106. The inlet axis Ai is perpendicular (e.g., transverse, etc.) to the center axis Ac.

[0047] The aftertreatment system 100 includes a diesel oxidation catalyst (DOC) member 108 positioned in the housing 102. The DOC member 108 is positioned downstream of the inlet chamber 104. The DOC member 108 is centered along the center axis Ac. The DOC member 108 is configured to receive exhaust from the inlet chamber 104 and oxidize carbon monoxide in the exhaust.

[0048] The aftertreatment system 100 also include a diesel particulate filter (DPF) 110 positioned in the housing 102. The DPF 110 is centered on the center axis Ac and is positioned downstream of the DOC member 108 in the housing 102. The DPF 110 is configured to receive flow from the DOC member 108 and filter out particles within the flow.

[0049] The aftertreatment system 100 further includes a mixer 112 positioned in the housing 102. The mixer 112 is centered on the center axis Ac and positioned downstream of the DPF 110 in the housing 102. The mixer 112 is configured to receive oxidized and filtered exhaust from the DPF 110 and mix the oxidized and filtered exhaust with a treatment fluid (e.g., reductant, etc.). For example, the mixer 112 may include a plurality of fins, or protrusions configured to swirl exhaust (e.g., create turbulence, etc.) and treatment fluid to facilitate mixing.

[0050] The aftertreatment system also includes a dosing module 113 (e.g., doser, etc.). The dosing module 113 is configured to facilitate passage of the reductant through the housing 102 and into the mixer 112. As is explained in more detail herein, the dosing module 113 is configured to receive reductant, and in some embodiments, configured to receive air and reductant, and provide the reductant and / or air-reductant mixture into the mixer 112 to facilitate treatment of the exhaust gas. The dosing module 113 may include an insulator interposed between a portion of the dosing module 113 and the portion of the housing 102 on which the dosing module 113 is mounted.

[0051] The aftertreatment system 100 also includes an outlet chamber 114. The outlet chamber 114 is positioned in the housing 102 at a downstream end of housing 102 and is centered along the center axis Ac. The outlet chamber 114 is configured to receive treated exhaust from the mixer 112 and direct flow out of the aftertreatment system 100.

[0052] The outlet chamber 114 includes an outlet 116 positioned on a circumferential side of the outlet chamber 114. The outlet 116 defines an outlet axis Aothat is perpendicular to the center axis Acand parallel to the inlet axis Ai. The outlet 116 is configured to facilitate flow of treated exhaust out of (e.g., away from, etc.) the aftertreatment system 100.III. Overview of an Example Baffle Plate Assembly

[0053] FIG. 2 is a side perspective view of a portion of the aftertreatment system of FIG. 1, including the inlet chamber 104. FIG. 3 A is a cross-sectional view of the inlet chamber 104 when viewed down the center axis Ac of the aftertreatment system 100 and FIG. 3B is a longitudinal cross-sectional view of the inlet chamber 104 and a portion of the housing 102. As shown in FIGS. 2-3B, the inlet chamber 104 includes an end wall 202. The end wall 202 is positioned on a second end of the inlet chamber 104 opposite the first end (e.g., an end coupled to the housing 102). The end wall 202 closes off (e.g., restricts, seals, etc.) the second end of the inlet chamber 104.

[0054] The inlet chamber 104 also includes a sidewall 204 that extends around the center axis Ac. The sidewall 204 is contiguous with (e.g., extends from, etc.) the end wall 202. In some embodiments, the sidewall 204 and the end wall 202 may be one continuous structure. In other embodiments, the sidewall 204 and the end wall 202 may be separate structures that are coupled together (e.g., welded, etc.).

[0055] The end wall 202 and the sidewall 204 define an internal volume 206 of the inlet chamber 104. The internal volume 206 may have a diameter greater than the diameter of the housing 102. The internal volume 206 is configured to receive flow from the inlet 106.

[0056] As shown in FIGS. 2-3B, the inlet chamber 104 also includes a baffle assembly 208. The baffle assembly 208 is coupled to the end wall 202 and extends from the end wall 202into the internal volume 206 (e.g., along a length of the aftertreatment system, etc.). The baffle assembly 208 is configured to direct flow into the housing 102. For example, flow may enter the inlet chamber 104 through the inlet 106 along the inlet axis Ai, and the baffle assembly 208 may redirect at least a portion of flow in a direction parallel to the center axis Ac toward the housing 102. Further, the baffle assembly 208 facilitates a desired flow distribution into the housing 102.

[0057] The baffle assembly 208 includes a plurality of tabs 210. The plurality of tabs 210 extend from the baffle assembly 208 in the transverse direction (e.g., parallel to the inlet axis Ai, etc.). Each of the plurality of tabs 210 is coupled (e.g., secured, welded, etc.) to the end wall 202.

[0058] The inlet chamber 104 may include a plurality of baffle assemblies 208 (e.g., a first baffle assembly 208a, a second baffle assembly 208b, etc.). For example, the inlet chamber 104 may include a first baffle assembly 208a extending along a first baffle plane ABI positioned adjacent to the inlet 106, and a second baffle assembly 208b extending along a second baffle plane AB2 positioned adjacent to an end of the inlet chamber opposite the inlet 106 (e.g., below the first baffle assembly 208a, etc.). The second baffle assembly 208b may be similar in shape to the first baffle assembly 208a. For example, the second baffle assembly may comprise the same shape as the first baffle assembly 208, but the first baffle assembly 208a may further define a plurality of through-holes. In other embodiments, the inlet chamber 104 may include any number of baffle assemblies 208 (e.g., 3, 4, 5, etc.).

[0059] As shown in FIGS. 3 A and 3B, the inlet chamber 104 may also include a perforated plate 302. The perforated plate 302 is positioned within the internal volume 206 and coupled to the sidewall 204 such that the center axis Ac extends through the perforated plate 302. For example, the perforated plate 302 may be centered along the center axis Ac. The perforated plate 302 is positioned downstream of the baffle assembly 208 and upstream of the housing 102. For example, the perforated plate 302 may be positioned a distance d (e.g., a distance in a range between 15mm and 60mm etc.) away from the baffle assembly 208 and adjacent to the inlet chamber outlet 107 of the inlet chamber 104.

[0060] The perforated plate 302 includes a perforated plate body 304. The perforated plate body 304 is a flat and solid portion of the perforated plate 302. The perforated plate body 304 is configured to disrupt the flow of exhaust exiting the inlet chamber and flowing into the housing 102. For example, the perforated plate body 304 may disrupt (e.g., direct elsewhere, force elsewhere) the flow of exhaust provided in a direction that is parallel to, or coincident with, the center axis Ac.

[0061] The perforated plate 302 defines a plurality of through-holes 306. The plurality of through-holes 306 may be uniformly defined (e.g., uniformly distributed through the perforated plate 302, etc.). The plurality of through-holes 306 are configured to facilitate flow through the perforated plate 302 into the housing 102 along planes parallel to the center axis Ac.

[0062] FIGS. 4-5 illustrate a baffle assembly 400 according to one embodiment. FIG. 4 is a perspective view of a baffle assembly 400 of the aftertreatment system of FIG. 1 according to one embodiment, and FIG. 5 is a front view of the baffle assembly 400 of FIG. 4. As previously described, the baffle assembly 400 is coupled to the end wall 202 and extends into the internal volume 206 of the inlet chamber 104. For example, the baffle assembly 400 may extend from the end wall 202 along a plane parallel to the center axis Ac and transverse to the inlet axis Ai towards the housing 102.

[0063] The baffle assembly 400 includes a flat strip 402. The flat strip 402 extends in a length direction (e.g., in a direction toward the housing 102, along a plane parallel to the center axis Ac, etc.). The flat strip 402 is a solid body that may be comprised of a metal. For example, the flat strip 402 may be formed from sheet metal (e.g., steel, etc.). The flat strip 402 is configured to disrupt the flow (e.g., exhaust, air, etc.) into the inlet chamber 104 along, parallel to, or coincident with, the inlet axis Ai. Further, the flat strip 402 is configured to direct flow towards the housing 102 in a direction parallel to, or coincident with, the center axis Ac. For example, flow is provided into the inlet chamber 104 parallel to, or coincident with, the inlet axis Ai and then contacts (e.g., hits, is disturbed by, etc.) the flat strip 402 and is redirected to flow along a plane parallel to the center axis Ac into the housing 102.

[0064] The flat strip 402 includes one or more elongated portions 403, 404, 405. The flat strip 402 also includes one or more notches 406, 407 that extend in a direction transverse to the center axis Acand to the length direction. For example, a notch 406, 407 is positioned between two elongated portions 403, 404, 405. For example, the flat strip 402 may include any number of elongated portions 403, 404, 405 (e.g., 2, 3, 4, etc.) and any number of notches 406, 407 (e.g., 1, 2, 3, etc.), with each of the notches 406, 407 positioned between a first elongated portion 403 and a second elongated portion 404. Similar to the flat strip 402, the elongated portions 403, 404, 405 and the one or more notches 406, 407 are configured to disrupt the flow (e.g., exhaust, air, etc.) into the inlet chamber 104 along, parallel to, or coincident with, the inlet axis Ai. Further, the notches 406, 407 are configured to facilitate movement of the baffle assembly in a direction along the flat strip 402 (e.g., a direction from a first end to a second end of the flat strip 402, etc.). For example, the notches 406, 407 facilitate the expansion of the baffle assembly 400 during thermal expansion and facilitate the contraction of the baffle assembly 400 during contraction, thus reducing the stress imparted on the baffle assembly 400. For example, the notches 406, 407 may facilitate the expansion and contraction (e g., movement, etc.) of one or more of the elongated portions 403, 404, 405 towards another elongated portion 403, 404, 405.

[0065] As shown in FIGS. 4-5, the flat strip 402 includes a first elongated portion 403, a second elongated portion 404, and a third elongated portion 405. The baffle assembly 400 also includes a first notch 406 and a second notch 407. The first notch 406 is positioned between the first elongated portion 403 and the second elongated portion 404. The second notch 407 is positioned between the second elongated portion 404 and the third elongated portion 405. Instead, in other embodiments the baffle assembly may include more or less elongated portions 403, 404, 405 and notches 406, 407. For example, the baffle assembly 208 may include any number of notches 406, 407 such that one of the elongated portions 403, 404, 405 extends between each adjacent pair of the plurality of notches 406, 407.

[0066] Further, as shown in FIGS. 4-5, each of the notches 406, 407 (e.g., the first notch 406 and the second notch 407) includes a first extension portion 408, 409 a second extension portion 410, 411 and a bridge portion 412, 413.

[0067] The first extension portion 408, 409 is contiguous with one of the elongated portions403, 404, 405 (e.g., the first elongated portion 403, the third elongated portion 405, etc.) and extends in the direction transverse to the center axis Ac (e.g., a direction parallel to the inlet axis Ai, etc.). For example, the first extension portion 408 of the first notch 406 is contiguous with a first end of the first elongated portion 403, and the first extension portion 409 of the second notch 407 is contiguous with a first end of the third elongated portion 405. The first extension portion 408, 409 is configured to facilitate the expansion or contraction of the baffle assembly 400. For example, the first extension portion 408, 409 may facilitate the movement of one of the elongated portions 403, 404, 405 towards another elongated portion 403, 404, 405 in a direction along the length L of the baffle assembly 400 during thermal contraction or expansion.

[0068] The second extension portion 410, 411 is contiguous with another one of the elongated portions 403, 404, 405 and also extends in the direction transverse to the center axis Ac (e.g., a direction parallel to the inlet axis Ai, etc.). For example, the second extension portion 410 of the first notch 406 is contiguous with a first end of the second elongated portion 404, and the second extension portion 411 of the second notch 407 is contiguous with a second end of the second elongated portion 404. The second extension portions 410, 411 are configured to facilitate the expansion or contraction of the baffle assembly 400. For example, the second extension portions 410, 411 may facilitate the movement of one of the elongated portions 403,404, 405 towards another elongated portion 403, 404, 405 in a direction along the length L of the baffle assembly 400 during thermal contraction or expansion.

[0069] Each of the bridge portions 412, 413 are positioned between the first extension portion 408, 409 and the second extension portion 410, 411 such that the each of the bridge portion 412, 413 is contiguous with each of the first extension portion 408, 409 and the second extension portion 410, 411. The bridge portions 412, 413 are configured to disrupt the flowcoincident with the inlet axis Ai and redirect the flow along a plane parallel to the center axis Ac toward the housing 102.

[0070] The end of the first extension portions 408, 409 contiguous with the elongated portions 403, 405, and the end of the second extension portions 410, 411 contiguous with the elongated portion 405 define gaps, 414, 415 (e.g., a distance between, etc.) between the elongated portions 403, 404, 405. As the elongated portion 403, 404, 405 move laterally in a direction along the length L the gaps 414, 415 may increase of decrease (e.g., the distance between the elongated portions 403, 404, 405 increases or decreases, etc.).

[0071] When the temperature of the aftertreatment system 100 decrease, various components contract, including the inlet chamber 104. Thus, the notches 406, 407 also contract. For example, during contraction each of the first elongated portion 403 and the third elongated portion 405 may be drawn closer to the second elongated portion 404, drawing the first extension portions 408, 409 toward the second extension portions 410, 41 1 . As the notches 406, 407 contract, the gaps 414, 415 between the second elongated portion 404 and each of the first elongated portion 403 and the third elongated portion 405 decreases.

[0072] When the temperature of the aftertreatment system increase, various components expand, including the inlet chamber 104. Thus, the notches 406, 407 also expand. For example, during expansion each of the first elongated portion 403 and the third elongated portion 405 may be drawn away from (e.g., toward the sidewall 204, etc.) the second elongated portion 404, drawing the first extension portions 408, 409 away from the second extension portions 410, 411 expanding the notches 406, 407. As the notches 406, 407 expand, the gaps 414, 415 between the second elongated portion 404 and each of the first elongated portion 403 and the third elongated portion 405 increases.

[0073] The flat strip 402 may also include a first slanted end 416 and a second slanted end 417. The first slanted end 416 is positioned on a first end of the flat strip 402 and extends away from the flat strip 402 at an angle B. The second slanted end 417 is positioned on a second end of the flat strip 402 and also extends away from the flat strip 402 at an angle B. For example,each of the first slanted end 416 and the second slanted end 417 may extend away from the flat strip 402 at an angle B between 30 and 60 degrees relative to the flat strip 402. In some embodiments, each of the first slanted end 416 and the second slanted end 417 are coupled to the sidewall 204. In other embodiments, the first slanted end 416 and the second slanted end 417 are positioned a distance (e.g., half an inch, quarter of an inch, etc.) away from the sidewall 204.

[0074] According to this embodiment, the baffle assembly 400 also includes the tabs 418,419, 420 as previously described. According to this embodiment, the baffle assembly 400 includes a first tab 418 centered on the flat strip 402 that extends opposite the inlet 106 in the transverse direction. The baffle assembly 400 also includes a second tab 419 positioned a distance away from and adjacent to the first slanted end 416, and a third tab 420 positioned a distance away from and adjacent to the second slanted end 417. The first tab 418 and the third tab 420 extend in an opposite direction than the second tab 419. Each of the first tab 418 and the third tab 420 extend toward the inlet 106 in the transverse direction. For example, the first tab 418 and the third tab 420 extend in a direction opposite the direction as the notches 406, 407. The second tab 419 extends away from the inlet 106 in the transverse direction. For example, the second tab 419 extends in the same direction as the notches 406, 407. The tabs 418, 419, 420 are configured to couple the baffle assembly 400 to the inlet chamber 104. For example, the tabs 418, 419, 420 may be coupled to the end wall 202. In other embodiments, the baffle assembly 400 may include more (e.g., 4, 5, etc.) or less (e.g., 1, 2, etc.) tabs 418, 419,420.

[0075] As shown in FIG. 4, the flat strip 402 also defines a plurality of through-holes 422. According to this embodiment, the plurality of through-holes 422are defined on the elongated portions 403, 404, 405. In other embodiments, the plurality of through-holes 422are defined on only a portion of the elongated portions 403, 404, 405 (e.g., the first elongated portion 403 and the third elongated portion 405, the second elongated portion 404 and the third elongated portion 405, etc.). The plurality of through-holes 422facilitate flow through the baffle assembly 400. For example, the through-holes 422facilitate a first portion of flow in the directiontransverse to the center axis Ac(e.g., parallel to the inlet axis Ai, etc.) and the elongated portions 404 facilitate a second portion of flow in a direction parallel to the center axis Ac. In other embodiments, each of the bridge portions 412, 413 may also define a plurality of through- holes 422.

[0076] Now referring to FIGS. 6 and 7 is a baffle assembly 600 according to another embodiment. FIG. 6 is a perspective view of the baffle assembly 600 and FIG. 7 is a side view of the baffle assembly 600. Similar to the baffle assembly 400, the baffle assembly 600 includes the flat strip 402, the elongated portions 403, 404, 405 defining the plurality of through-holes 422, and the notches 406, 407. According to this embodiment, the elongated portions 403, 404, 405 may have a thickness T of about 2.5mm. For example, the elongated portions 403, 404, 405 having a thickness T of about 2.5mm may increase the robustness of the baffle assembly 600 when subject to vibrational stress.

[0077] As shown in FIGS. 6 and 7, the first extension portions 608, 609 and the second extension portions 610, 611 have a length LH in a range between 15mm to 20 mm. The length LH of the first extension portions 608, 609 and the second extension portions 610, 611 may be preferably 18mm. The first extension portions 608, 609 and the second extension portions 610, 611 may be longer than the first extension portions 408, 409 and the second extension portions 410, 411 of the baffle assembly 400. The length LH of the first extension portions 608, 609 may be beneficial for thermal expansion of the baffle assembly 600.

[0078] Further, the bridge portions 612, 613 of the baffle assembly 600 have a length Lw in a range between 25mm to 30mm. The length Lw of the bridge portions 612, 613 is preferably 30mm. The bridge portions 612, 613 may be longer than the bridge portions 412, 413 of the baffle assembly 400. The length Lw of the bridge portions 612, 613 may be beneficial for thermal expansion of the baffle assembly 600. Further, the combination of the length LH of the first extension portions 608, 609 and the length Lw of the bridge portions 612, 613 may provide greater benefit regarding thermal expansion of the baffle assembly 600.

[0079] The length Lw of the bridge portions 612, 613 also increases the gaps 614, 615 between each of the elongated portions 403, 404, 405. For example, the gaps 614, 615 may be about the same length (e.g., the length Lw, etc.) as the bridge portions 612, 613. Thus, the gaps 614, 615 of the baffle assembly 600 may be larger (e.g., longer, etc.) that the gaps 414, 415, of the baffle assembly 400. The increased length of the gaps 614, 615 may allow for a greater degree of movement of the first elongated portion 403 and the third elongated portion 405 towards and away from the second elongated portion 404 during thermal expansion and contraction.

[0080] The baffle assembly 600 includes rounded edges 624, 625, 626, 627 positioned (e.g., formed, etc.) where each of the elongated portions 403,404, 405 are contiguous with one of the first extension portions 608,609 or the second extension portions 610, 611. The rounded edges 624, 625, 626, 627 may have a radius of curvature RE in a range between 2mm to 3mm, preferably being 3 mm. For example, the rounded edges 624, 625, 626, 627 having a radius of curvature RE of 3mm may reduce stress concentration at or near the rounded edges 624, 625, 626, 627.

[0081] FIGS. 8 and 9 illustrate a baffle assembly 800 according to another embodiment. FIG. 8 is a perspective view of the baffle assembly 800 and FIG. 9 is a side view of the baffle assembly 800. Similar to the baffle assembly 400 and the baffle assembly 600, the baffle assembly 800 includes the flat strip 402, the elongated portions 403, 404, 405 defining the plurality of through-holes 422, and the notches 406, 407. According to this embodiment, the elongated portions 403, 404, 405 may have a thickness T of about 2mm. For example, the elongated portions 403, 404, 405 having a thickness T of about 2mm may increase the robustness of the baffle assembly 800 when subject to vibrational stress.

[0082] As shown in FIGS. 8 and 9, the first extension portions 808, 809 and the second extension portions 810, 811 have a length LH in a range between 10mm to 15mm. The length LH of the first extension portions 808, 809 and the second extension portions 810, 811 may be preferably 10mm. The length LH of the first extension portions 808, 809 may be beneficial for thermal expansion of the baffle assembly 800.

[0083] Further, the bridge portions 812, 813 of the baffle assembly 800 have a length Lir in a range between 15mm to 20mm. The length Lw of the bridge portions 812, 813 is preferably 15mm. The bridge portions 812, 813 may be longer than the bridge portions 412, 413 of the baffle assembly 400. The length Lw of the bridge portions 812, 813 may be beneficial for thermal expansion of the baffle assembly 800. Further, the combination of the length LH of the first extension portions 808, 809 and the length Lw of the bridge portions 812, 813 may provide preferentially allow for thermal expansion of the baffle assembly 800.

[0084] Similarly, to the baffle assembly 600, the length Lw of the bridge portions 812, 813 is directly related to the length of the gaps 814, 815 between each of the elongated portions 403, 404, 405. For example, the gaps 814, 815 may be about the same length (e.g., the length Lw, etc.) as the bridge portions 812, 813. Thus, the gaps 814, 815 of the baffle assembly 600 may be larger (e.g., longer, etc.) than the gaps 414, 415, of the baffle assembly 400. The increased length of the gaps 814, 815 may allow for a greater degree of movement of the first elongated portion 403 and the third elongated portion 405 towards and away from the second elongated portion 404 during thermal expansion and contraction.

[0085] The baffle assembly 600 includes rounded edges 824, 825, 826, 827 positioned (e.g., formed, etc.) where each of the elongated portions 403,404, 405 are contiguous with one of the first extension portions 808, 809 or the second extension portions 810, 811. Similar to the baffle assembly 600, the rounded edges 824, 825, 826, 827 may have a radius of curvature RE in a range between 2mm to 3mm, but according to this embodiment the RE is preferably 2mm. The combination of the length LH, the width Lw, and the radius of curvature RE of the baffle assembly 800 may increase the robustness of the baffle assembly 800 when subject to thermal expansion and contraction and vibrational stress.

[0086] FIGS. 10 and 11 illustrate a baffle assembly 1000 according to another embodiment. FIG. 10 is a perspective view of the baffle assembly 1000 and FIG. 11 is a side view of the baffle assembly 1000 of FIG. 10. Similar to the baffle assemblies 400, 600, 800, the baffle assembly 1000 includes the flat strip 402, the elongated portions 403, 404, 405, and the notches406, 407. According to this embodiment, the elongated portions 403, 404, 405 also define the plurality of through-holes 422.

[0087] According to this embodiment, each of the notches 406, 407 further include a first slanted portion 1002, 1003. The first slanted portions 1002, 1003 extends away from an end (e.g., an end opposite the end contiguous with the elongated portion 403, 404, 405) of the first extension portions 408, 409 at an angle A. For example, the first slanted portions 1002, 1003 may extend at an angle A in a range between 30 and 60 degrees relative to the first extension portions 408, 409 towards the second extension portions 410, 411.

[0088] Each of the notches 406, 407 also include a third extension portion 1004, 1005. The third extension portion 1004 extends away from the first slanted portions 1002, 1003 in the transverse direction (e.g., the transverse direction away from the inlet 106) to the bridge portions 412, 413. Each of the first slanted portions 1002, 1003 and the third extension portions 1004, 1005 are configured to facilitate the expansion and contraction of the baffle assembly 1000 due to temperature change or vibration.

[0089] Each of the notches 406, 407 also include a second slanted portion 1006, 1007. The second slanted portions 1006, 1007 extend away from an end (e.g., an end opposite the end contiguous with the elongated portion 403, 404, 405, etc.) of the second extension portion 410, 411. For example, the second slanted portions 1006, 1007 may extend at an angle A in a range between 30 and 60 degrees relative to the second extension portions 410, 411 towards the first extension portions 408, 409.

[0090] Each of the notches 406, 407 also include a fourth extension portion 1008, 1009. The fourth extension portions 1008, 1009 extend away from the second slanted portions 1006, 1007 in the transverse direction (e.g., the transverse direction away from the inlet 106) to the bridge portions 412, 413. Each of the second slanted portions 1006, 1007 and the fourth extension portions 1008, 1009 are configured to facilitate the expansion or contraction of the baffle assembly 1000 due to temperature change or vibration.

[0091] The first slanted portions 1002, 1003 and the second slanted portions 1006, 1007 facilitate a greater distance between the elongated portions 403, 404, 405 in the baffle assembly 1000 than in the baffle assembly 400. For example, the gaps 1010, 1011 may be larger than the gaps 414, 415. Thus, the first slanted portions 1002, 1003 and the second slanted portions 1006, 1007 may allow for a greater degree of contraction and expansion of the notches 406, 407. The first slanted portions 1002, 1002 and the second slanted portions 1006, 1007 facilitate the expansion and contraction of the notches 406, 407 by accommodating the stress imparted on the baffle assembly 1000, thus reducing the concentration of stress on the flat strip 402.

[0092] When the temperature decreases, the notches 406, 407 contract. For example, during contraction each of the first elongated portion 403 and the third elongated portion 405 may be drawn closer to the second elongated portion 404, drawing the first extension portions 408, 409 toward the second extension portions 410, 411 contracting the notches 406, 407.

[0093] As the first extension portions 408, 409 are drawn toward the second extension portions 410, 411 the angle d of the first slanted portions 1002, 1003 may decrease. For example, the angled of the first slanted portions 1002, 1003 relative to the first extension portions 408, 409 may decrease, such that the angle A is in a range between 80 and 110 degrees. Further, during contraction of the notches 406, 406, the third extension portions 1004, 1005 may be drawn toward the fourth extension portions 1008, 1009.

[0094] As the notches 406, 407 contract, the gaps 414, 415 between the second elongated portion 404 and each of the first elongated portion 403 and the third elongated portion 405 decrease.

[0095] When the temperature increases, the notches 406, 407 expand. For example, during expansion each of the first elongated portion 403 and the second elongated portion 404 may be drawn away from (e.g., toward the sidewall 204, etc.) the second elongated portion 404, drawing the first extension portions 408, 409 away from the second extension portions 410, 411 expanding the notches 406, 407. Further, during expansion of the notches 406, 406, the thirdextension portions 1004, 1005 may be drawn away from the fourth extension portions 1008, 1009.

[0096] As the first extension portions 408, 409 are drawn away from the second extension portions 410, 411 the angle A of the first slanted portions 1002, 1003 may increase. For example, the angled of the first slanted portions 1002, 1003 relative to the first extension portions 408, 409 may increase, such that the angle A is in a range between 130 and 150 degrees.

[0097] As the notches 406, 407 expand, the gaps 414, 415 between the second elongated portion 404 and each of the first elongated portion 403 and the third elongated portion 405 increases.IV. Configuration of Example Embodiments

[0098] While this specification contains many specific implementation details, these should not be construed as limitations on the scope of what may be claimed but rather as descriptions of features specific to particular implementations. Certain features described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can, in some cases, be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

[0099] As utilized herein, the terms “generally,” “approximately,” and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should beinterpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the appended claims.

[0100] The term “coupled” and the like, as used herein, mean the joining of two components directly or indirectly to one another. Such joining may be stationary (e.g., permanent) or moveable (e g., removable or releasable). Such joining may be achieved with the two components or the two components and any additional intermediate components being integrally formed as a single unitary body with one another, with the two components, or with the two components and any additional intermediate components being attached to one another.

[0101] The terms “fluidly coupled to” and the like, as used herein, mean the two components or objects have a pathway formed between the two components or objects in which a fluid, such as air, reductant, an air-reductant mixture, exhaust gas, hydrocarbon, an airhydrocarbon mixture, may flow, either with or without intervening components or objects. Examples of fluid couplings or configurations for enabling fluid communication may include piping, channels, or any other suitable components for enabling the flow of a fluid from one component or object to another.

[0102] It is important to note that the construction and arrangement of the various systems shown in the various example implementations is illustrative only and not restrictive in character. All changes and modifications that come within the spirit and / or scope of the described implementations are desired to be protected. It should be understood that some features may not be necessary, and implementations lacking the various features may be contemplated as within the scope of the disclosure, the scope being defined by the claims that follow. When the language “a portion” is used, the item can include a portion and / or the entire item unless specifically stated to the contrary.

[0103] Also, the term “or” is used, in the context of a list of elements, in its inclusive sense (e.g., and not in its exclusive sense) so that when used to connect a list of elements, the term “or” means one, some, or all of the elements in the list. Conjunctive language such as thephrase “at least one of X, Y, and Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to convey that an item, term, etc. may be either X, Y, Z, X and Y, X and Z, Y and Z, or X, Y, and Z (e.g., i.e., any combination of X, Y, and Z). Thus, such conjunctive language is not generally intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to each be present, unless otherwise indicated.

[0104] Additionally, the use of ranges of values (e.g., W1 to W2, etc.) herein are inclusive of their maximum values and minimum values (e.g., W1 to W2 includes W1 and includes W2, etc.), unless otherwise indicated. Furthermore, a range of values (e.g., W1 to W2, etc.) does not necessarily require the inclusion of intermediate values within the range of values (e g., W1 to W2 can include only W1 and W2, etc.), unless otherwise indicated.

Claims

WHAT IS CLAIMED IS:

1. An inlet chamber comprising: an inlet defining an inlet axis and configured to receive exhaust; a sidewall extending around a center axis; an end wall coupled to the sidewall such that the center axis extends through the end wall, the sidewall and the end wall defining an internal volume; and a baffle assembly coupled to the end wall and extending from the end wall into the internal volume, the baffle assembly comprising a flat strip having one or more elongated portions extending in a length direction, and one or more notches that extend in a direction transverse to the center axis and to the length direction.

2. The inlet chamber of claim 1, wherein: the one or more notches comprise a plurality of notches; and one of the one or more elongated portions extends between each adjacent pair of the one or more notches.

3. The inlet chamber of claim 1, wherein: each of the one or more notches comprises: a first extension portion contiguous with a first of the one or more elongated portions and extending in the direction transverse to the center axis, a second extension portion contiguous with a second of the one or more elongated portions and extending in the direction transverse to the center axis, and a bridge portion contiguous with each of the first extension portion and the second extension portion, the bridge portion extending between the first extension portion and the second extension portion.

4. The inlet chamber of claim 1, wherein: each of the one or more notches further comprises:a first extension portion contiguous with a first of the one or more elongated portions and extending in the direction transverse to the center axis, a second extension portion contiguous with a second of the one or more elongated portions and extending in the direction transverse to the center axis, a first slanted portion extending away from an end of the first extension portion; a third extension portion extending away from an end of the first slanted portion in the direction transverse to the center axis, a second slanted portion extending away from an end of the second extension portion, a fourth extension portion extending away from an end of the second slanted portion in the direction transverse to the center axis, and a bridge portion contiguous with each of the third extension portion and the fourth extension portion, the bridge portion extending between the third extension portion and the fourth extension portion.

5. The inlet chamber of claim 4, wherein the first slanted portion extends away from the first extension portion at an angle in a range between 120 and 150 degrees relative to the first extension portion.

6. The inlet chamber of claim 4, wherein the second slanted portion extends away from the second extension portion at an angle in a range between 120 and 150 degrees relative to the second extension portion.

7. The inlet chamber of claim 1, further comprising a perforated plate positioned in the internal volume a distance away from and downstream of the baffle assembly and coupled to the sidewall such that the center axis extends through the perforated plate, the perforated plate defining a plurality of through-holes.

8. The inlet chamber of claim 1, wherein the flat strip defines a plurality of through-holes facilitating a first portion of flow in the direction transverse to the center axis and the one or more elongated portions facilitating a second portion of flow in a direction parallel to the center axis.

9. An aftertreatment system comprising: a housing defining a housing center axis, the housing having a housing first end; and the inlet chamber of claim 1, the inlet chamber being coupled to the housing first end.

10. The aftertreatment system of claim 9, further comprising a diesel oxidation catalyst member and a diesel particulate filter, each positioned in the housing downstream of the inlet chamber, the diesel oxidation catalyst member in fluid receiving communication with an inlet chamber outlet of the inlet chamber.

11. The aftertreatment system of claim 10, further comprising: a mixer positioned in the housing downstream of the diesel particulate filter, and in fluid receiving communication with the diesel particulate filter; and an outlet chamber positioned in the housing downstream of the mixer, the outlet chamber in fluid receiving communication with the mixer.

12. A baffle assembly for an aftertreatment system, the baffle assembly comprising: a flat strip having a plurality of elongated portions extending in a length direction, the plurality of elongated portions including a first elongated portion and a second elongated portion; one or more tabs extending from the flat strip, the one or more tabs configured to facilitate coupling of the baffle assembly to an inlet chamber of the aftertreatment system; and a first notch that extends in a direction transverse to the length direction, the first notch comprising:a first notch first extension portion contiguous with the first elongated portion and extending in the direction transverse to the length direction, a first notch second extension portion contiguous with the second elongated portion and extending in the direction transverse to the length direction, and a first notch bridge portion extending between the first notch first extension portion and the first notch second extension portion.

13. The baffle assembly of claim 12, further comprising: a second notch that extends in the direction transverse to the length direction, the second notch comprising: a second notch first extension portion contiguous with the second elongated portion and extending in the direction transverse to the length direction, a second notch second extension portion contiguous with a third elongated portion among the plurality of elongated portions and extending in the direction transverse to the length direction, and a second notch bridge portion extending between the second notch first extension portion and the second notch second extension portion.

14. The baffle assembly of claim 13, further comprising: a first slanted portion extending away from an end of the first elongated portion at a first angle, the first angle being in a range between 30 degrees and 60 degrees relative to the flat strip; and a second slanted portion extending away from an end of the third elongated portion at a second angle, the second angle being in a range between 30 degrees and 60 degrees relative to the flat strip.

15. The baffle assembly of claim 13, wherein a length of each of the first notch bridge portion and the second notch bridge portion, in a direction parallel to the length direction, is in a range between 15mm and 30mm.

16. The baffle assembly of claim 13, wherein a length of each of the first notch first extension portion, the first notch second extension portion, the second notch first extension portion, and the second notch second extension portion, in a direction perpendicular to the length direction, is in a range between 10mm and 20mm.

17. The baffle assembly of claim 12, wherein: the one or more tabs includes: a first tab extending in a first direction that is transverse to the length direction, and a second tab extending in a second direction that is transverse to the length direction and opposite the first direction.

18. An aftertreatment system comprising: a housing defining a center axis; and an inlet chamber coupled to the housing, the inlet chamber comprising: an inlet defining an inlet axis transverse to the center axis, the inlet configured to receive exhaust, a sidewall extending around a center axis and coupled to the housing, an end wall coupled to the sidewall such that the center axis extends through the end wall, the sidewall and the end wall defining an internal volume, and a first baffle assembly coupled to the end wall and extending from the end wall into the internal volume, the first baffle assembly comprising: a first flat strip having a plurality of elongated portions extending in a length direction and configured to facilitate exhaust flow in a direction parallel to the center axis, the first flat strip defining a plurality of through-holes that facilitate flow in a direction parallel to the inlet axis, and one or more first notches that extend in a direction transverse to the center axis and to the length direction, anda second baffle assembly coupled to the end wall and extending from the end wall into the internal volume, the second baffle assembly positioned a distance offset from the first baffle assembly along the inlet axis in a direction away from the inlet and comprising: a second flat strip having a plurality of elongated portions extending in a length direction and configured to facilitate exhaust flow in the direction parallel to the center axis, and one or more second notches that extend in a direction transverse to the center axis and to the length direction.

19. The aftertreatment system of claim 18, wherein: each of the one or more first notches and the one or more second notches comprises: a first extension portion contiguous with a first elongated portion among the plurality of elongated portions of the respective flat strip, a second extension portion contiguous with a second elongated portion among the plurality of elongated portions of the respective flat strip, and a bridge portion extending between the first extension portion and the second extension portion.

20. The aftertreatment system of claim 19, wherein: each of the first baffle assembly and the second baffle assembly is expandable between a first position and a second position; a gap distance is defined between an end of the first extension portion that is contiguous with the first elongated portion and an end of the second extension portion that is contiguous with the second elongated portion; and the gap distance when the first baffle assembly and the second baffle assembly are in the second position is greater than the gap distance when the first baffle assembly and the second baffle assembly are in the first position.

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