Filter element with axial flexible feature in end cap

Abstract

A filter cartridge includes a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge. An end cap is arranged at the first end of the filtration media. The end cap includes a first part and a second part disposed an axial distance from the first part along the longitudinal axis between the first part and the second part. The end cap further includes an axial flexible feature disposed between the first part and the second part, the axial flexible feature configured to allow a deflection of the axial feature between the first part and at least a portion of the second part along the longitudinal axis between the first end and the second end.

Description

[0001] Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl

[0002] FILTER ELEMENT WITH AXIAL FLEXIBLE FEATURE IN END CAP

[0003] Cross Reference to Related Applications

[0004] This application claims the benefit of U.S. 63 / 715,178, filed November 1, 2024, the disclosure of which is incorporated by reference herein in its entirety.

[0005] Field of the Technology

[0006] The present disclosure relates to filter cartridges or elements and associated filter assemblies, such as for instance air filter elements.

[0007] Background

[0008] Air cleaners are used to filter combustion intake air for internal combustion engines of a variety of vehicles and other equipment, such as: trucks; buses; off-road construction equipment; agriculture equipment; generator sets; etc. Such air cleaners typically include a housing with at least one removable and replaceable filter cartridge positioned therein.

[0009] Summary

[0010] One illustrative filter cartridge includes a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge. An end cap is arranged at the first end of the filtration media. The end cap includes a first part and a second part disposed an axial distance from the first part along the longitudinal axis between the first part and the second part. The end cap further includes an axial flexible feature disposed between the first part and the second part, the axial flexible feature configured to allow a deflection of the axial feature between the first part and at least a portion of the second part along the longitudinal axis between the first end and the second end.

[0011] An illustrative filter cartridge for an air cleaner assembly includes a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge. An end cap is arranged at the first end of the filtration media. The end cap includes a first part; and a second part disposed distal from the first part along the longitudinal axis between the first end and the second end. The end cap further includes a plurality of flexible Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl linear cross ribs coupled between the first part and the second part, the plurality of flexible linear cross ribs configured to allow a deflection between the first part and the second part along the longitudinal axis between the first end and the second end.

[0012] An illustrative filter cartridge for an air cleaner assembly includes a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge. An end cap is arranged at the first end of the filtration media. The end cap includes a first part and a second part disposed distal from the first part along the longitudinal axis between the first end and the second end. A first flexible feature is disposed proximate a center of the end cap along a horizontal axis. A second flexible feature is disposed around the first feature and radially outward from the first feature. At least one of the first flexible feature and the second flexible feature is configured to allow a deflection between the first part and at least a portion of the second part along the longitudinal axis between the first part and the second part.

[0013] The above summary is not intended to describe each embodiment or every implementation. Rather, a more complete understanding of illustrative embodiments will become apparent and appreciated by reference to the following detailed description and claims in view of the accompanying figures of the drawings.

[0014] Brief Description of the Drawings

[0015] FIGS. 1 A show a filter cartridge having a filtration media in accordance with examples described herein.

[0016] FIG. IB illustrates a cross-section of the filter element in a housing in accordance with examples described herein.

[0017] FIG. 2A shows an example of a filter cartridge having an end cap with an integrated flexible feature in accordance with embodiments described herein.

[0018] FIG. 2B shows a more detailed view of a filter cartridge end cap with an integrated axial flexible feature in accordance with examples described herein.

[0019] FIGS. 2C and 2D illustrate a more detailed view of an axial integrated feature in accordance with examples described herein.

[0020] FIG. 3 shows an example of a filter cartridge having an end cap with an integrated axial flexible feature having a plurality of cross ribs in accordance with examples described herein. Docket No. 0444.000247W001

[0021] DCI Ref. 00011033 -WOOl

[0022] FIGS. 4A-4C show another example of a filter cartridge having an end cap with an integrated flexible feature having a plurality of cross ribs in accordance with examples described herein.

[0023] FIGS. 5A-5E show another example of a filter cartridge having an end cap with an integrated flexible feature having a plurality of cross ribs in accordance with examples described herein.

[0024] The present technology may be more completely understood and appreciated in consideration of the following detailed description of various embodiments in connection with the accompanying drawings. The figures are rendered primarily for clarity and, as a result, are not necessarily drawn to scale. Moreover, various structure / components, including but not limited to fasteners, sealing components, and the like, may be shown diagrammatically or removed from some or all of the views to better illustrate aspects of the depicted embodiments, or where inclusion of such structure / components is not necessary to an understanding of the various exemplary embodiments described herein. The lack of illustration / description of such structure / components in a particular figure is, however, not to be interpreted as limiting the scope of the various embodiments in any way.

[0025] Docket No. 0444.000247W001

[0026] DCI Ref. 00011033 -WOOl

[0027] Detailed Description

[0028] Some issues relating to air cleaner arrangements with a serviceable filter cartridge include, for example, ensuring proper installation and sealing, obtaining appropriate support for the filter cartridge within the air cleaner, ensuring that the air cleaner housing is protected against improper installation of a filter cartridge, ensuring that the air cleaner housing is protected against installation of an improper filter cartridge, providing for convenient installation and removal, and being robust and compact. A filter cartridge typically comprises a seal suitable for securing the filter cartridge and sealing against an inner surface of the housing when installed, thereby defining a clean and a dirty air portion of the internal volume of the filter housing. Filter cartridge elements may have size variation in manufactured parts. Flexible features disposed in the end cap may help to alleviate issues that may arise due to these manufacturing differences.

[0029] FIGS. 1 A and IB depict a filter cartridge 100 including a filtration media 132. A housing 140 may be disposed about the filter cartridge. According to various examples the filtration media 132 is a pleated filter type. In this example, the filtration media arrangement is arranged in a tubular configuration, and which extends along a longitudinal axis between a first axial end 126 and a second axial end 127 and defines an internal volume 122 of the filter cartridge 100. In some examples, the pleated filter pack comprises pleats of constant pleat height, such that both radially inner and outer surfaces of the filtration media 132 have a cylindrical envelope, the respective cylindrical envelopes being arranged concentrically, i.e., along a common axis. In other embodiments, the inner and / or outer diameters of the filtration media 132 may differ at the first 126 and / or second 127 axial ends such that the filtration media may have a cone shape.

[0030] An end cap 120 is arranged at or on the first axial end 126 of the filtration media 132, which further delimits the internal volume 122. The end cap 120 is bound to the first axial end 126 in a sealing manner. For example, the end cap 120 may be bound by plastic injection of the end cap onto the filtration media 132 or it can be bonded by direct bonding, or by gluing, or using a potting material. The end cap 120 may be a closed end cap, in the sense that it does not comprise a feedthrough opening for fluids and / or air. In some examples, the end cap 120 is at least a partially open end Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl cap such that it allows passage of at least one of fluid or air in at least some configurations.

[0031] Filter cartridge elements and air cleaners may have a length variation in manufactured parts. These length variations may be cumulative. For example, a total length assembly variance in a range of -5 mm to +5 mm, in a range of -4 mm to +4 mm, in a range of -3 mm to +3 mm, or any combination thereof. In some examples, the elements can have a length assembly differences in a range of 0.1% to 5% or in a range of 0.5% to 1%.

[0032] Examples described herein include an axial flexible feature integrated into an end cap, which can cope with axial tolerance. The end cap may be a welded plastic end cap. The axial flexible feature facilitates fixating the element between a housing body, a plastic tower, and / or a safety element and a service cover in a reliable way without damaging parts or rattling or making noise. According to some examples a second end cap opposite the end cap with the axial flexible feature may have a thermoplastic elastomer (TPE) seal.

[0033] Integrating the axial flexible feature into the end cap provides a cost reduction. The axial flexible feature and the body of the end cap that does not include the axial flexible feature may be made using the same material or different materials. According to various examples, the end cap including the integrated flexible element are welded plastic end caps. The axial flexible feature may be referred to herein as an axial spring feature.

[0034] FIGS. 2A-D show an example of an end cap with an integrated axial flexible feature. In filter cartridge 200, the closed end cap 220 has an axial flexible feature 210 integrated in the center of the end cap 220, which can be pushed in by an access cover 290 when locking the access cover 290 to an air cleaner housing. The end cap 220 has a first part 225 and a second part 230 disposed distally from the first part 225 along a longitudinal axis 250. A centrally positioned axial flexible feature 210 is disposed axially between the first part 225 and the second part 230. The end cap 220 is adapted for allowing a deflection of the axial flexible feature 210 between the first part 225 and at least a portion of the second part 230 along the longitudinal axis 250. The deflection may be defined as a reversible displacement. For example, the deflection may be caused when a predefined force range is applied to the end cap (e.g., an axial Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl force). Once the force is removed, the axial flexible feature 210 returns to its original position before application of the force.

[0035] In this example, the axial flexible feature 210 has a first feature 260 disposed proximate a center of the end cap 220. A second feature 270 is disposed radially outward from the first feature 260. According to various configurations, the first feature 260 and the second feature 270 are different shapes. For example, in the element shown in FIG. 2A, the first feature 260 is a truncated cone having a base that is positioned proximate the second part 230 of the end cap 220. While the first feature 260 is shown in FIGS. 2A-2C as being linearly truncated along a horizontal axis of the filter cartridge 200, it is to be understood that the first feature 260 may have a different shape that is not truncated linearly. For example, the first feature 260 may have a convex or a concave shape. The axial flexible feature 210 may be made with any suitable material. For example, the axial flexible feature and / or the end cap may be made with any type of fusion contacted plastics such as polypropylene and Acrylonitrile Butadiene Styrene (ABS), for example. In some examples, the end cap 220 and / or the axial flexible feature 210 may be made using a closed mold. In some examples, the end cap is injection molded with a relatively stiff material and the flexible feature is overmolded with a relatively flexible material such as polyurethane foam in an open mold. According to various examples, the first feature 260 is a different shape that can be demolded with an open-closed tool. A shape of the first feature 260 may include rotationally symmetric shapes such as cones, cylinders, and spheres, for example.

[0036] The second feature 270 shown in FIGS. 2A-2D is a ridge having a convex ridge 272, a first concave ridge 274 and a second concave ridge 278. The first 274 and second 278 concave ridges are disposed on opposite sides of the convex ridge 272 as shown in FIG, 2B. The second feature 270 and extends radially outward from the first feature 260. In an example having a circular end cap 220, the second feature 270 may extend circumferentially around the first feature 260. In this example, the convex ridge 272 is disposed closer to the first part 225 than the first 274 or second 278 concave ridges. In this example, the second feature 270 is depicted as having a U- shape but may be any suitable shape. Flexibility of the axial flexible feature 210 is created by the second feature 270 bellow created in between the first feature 260 and the inner wall 275. According to various examples, at least a portion of the second Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl feature 270 is thinner than other portions of the axial flexible feature 210. The wall thickness of the U bend may be made thinner than the base thickness (for example, 1 mm thinner) to flex without exceeding maximum permissible stresses of the material being able to return back to an original state when the force is removed.

[0037] The access cover 290 has a central conical pushing part 292 which contacts the middle of the end cap 220 and deflects the axial flexible feature 210 of the closed end cap 220. While the central conical pushing part 292 is depicted as having a substantially flat surface that is configured to come into contact with the first flexible feature 260, it is to be understood that the central conical pushing part 292 surface may have other shapes. For example, the central conical pushing part 292 surface may be convex or concave. The surface of the central conical pushing part 292 may reciprocally match a surface shape of the first flexible feature. For example, for a first flexible feature having a convex surface, the central conical pushing part surface may be concave such that the surfaces that come into contact match reciprocally. In other examples, the first flexible feature may have a convex surface and the pushing part surface may also be convex to transfer force to the first flexible feature. According to some examples, the access cover 290 also takes some part of the deflection. The end cap 220 may help to align the cover 290 with the filter cartridge 200. In some examples, the end cap 220 may help to align the filter cartridge 200 inside the cover 290.

[0038] According to various examples, at least the first feature 260 is configured to reversibly displace upon an application of force to the axial flexible feature 210. For example, the first feature 260 may be configured to displace in a direction indicated by arrow 280 upon application of a predefined force or a range of predefined forces. For example, the predefined force may be in a range of about 0 N to about 300 N. The apex of the first feature 260 may start at a first position 262 and, upon application of the predefined axial force, move to a second position 264. A distance between the first position 262 and the second position 264 may be in a range of about 0% to about 40% of a total height 282 of the first feature 260 or in a range of about 0% to about 30% of a total height 282 of the first feature 260. The amount of deflection between the first position 262 and the second position 264 may be based on an amount of force applied such that the amount of deflection continuously varies with respect to the amount of force applied within a predefined force range. The amount of deflection may be linear Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl or non-linear with respect to the amount of force applied within the predefined force range. The amount of deflection between the first position 262 and the second position 264 will vary from one filter element to another filter element as it is dependent on the axial tolerances of the media packs, and flexibility of the injection molded parts (e.g., endcap and cover). The flexible feature 210 allows for an auto correction to cope with axial tolerances of the filter element and cover to keep the element seal installed at the same axial position. The installation cover force will vary from one filter assembly to another filter assembly.

[0039] FIGS. 2C and 2D illustrate other views of the axial flexible feature 210 in accordance with examples described herein. In these views, the second feature 270 can clearly be seen as extending around the first feature 260. Specifically, FIG. 2C illustrates a first view of the first feature 260 and the second feature 270 and FIG. 2D illustrates an opposite view of the same first feature 260 and second feature 270. In these examples, FIG. 2C shows the first feature 260 as being concave from a first perspective view from a first side, and FIG. 2D illustrates the first feature 260 as being convex from a perspective view from an opposing, second side. FIG. 2C also shows an opposite view of the view of FIG. 2B such that the convex ridge 272 appears concave and the first 274 and second 278 concave ridges appear convex.

[0040] FIG. 3 shows an example of a filter cartridge 300 having an end cap 320 with an integrated axial flexible feature 360 having a plurality of cross ribs 380. In this example, bending deformation is used instead of compression. The axial flexible feature 360 has a plurality of cross ribs 380 disposed around the periphery of the end cap 320. In some examples, one or more of the cross ribs 380 is transverse to the first part 325 and / or the second part 330 of the axial flexible feature 360. According to various examples, the second part 330 includes a ring. Each of the cross ribs 380 extend between the first part 325 and the second part 330. In this example, each of the cross ribs 380 extend linearly between the first part 325 and the second part 330. In some examples, one or more of the cross-ribs 380 do not have a linear configuration.

[0041] The first part 325 and the second part 330 may have a same outer shape. In this example, an outer shape of the first part 325 and the second part 330 are circular. The first part 325 and the second part 330 may have substantially the same outer size. For example, a circumference of the first part 325 and the second part 330 may be the same. The first part 325 may have a larger circumference than a circumference of the Docket No. 0444.000247W001

[0042] DCI Ref. 00011033 -WOOl second part 330. In some examples, the first part 325 and the second part 330 have different outer shapes and / or different sizes. For example, various types of polygonal shapes with any number of sides may be used for one or both of the first part 325 and the second part 330.

[0043] The cross ribs 380 are configured to deform upon application of a predefined force or a range of predefined forces. For example, the predefined force may be in a range of about 0 N to about 300 N. In this example, the cross ribs 380 are at a first position 382 at a force less than the predefined force and are configured to deflect upon application of at least the predefined force. In some examples, the cross ribs 380 are configured to deflect to a maximum second position 384 once the applied force reaches a predefined value. For example, the cross ribs 380 may approach orthogonality with respect to the first part 325 and the second part 330 upon application of the predefined force. Upon deformation of the end cap 320 with the application of the predefined force range, a displacement distance 385 between the first part 325 and the second part 330 increases. For example, the displacement distance 385 may increase in a range of about 0% to about 50% or in a range of about 0% to about 35%. In some examples, upon an application of force to the second part 330, a counterforce pushes the first part 325 and the filter cartridge 300 away from the second part 330 such that the first part 325 is displaced relative to the second part 330 by the displacement distance.

[0044] Similarly to the example shown in FIGS. 2A-2D, the amount of deflection between the first position 382 and the second position 384 may be based on an amount of force applied such that the amount of deflection continuously varies with respect to the amount of force applied within a predefined force range. An angle of the cross ribs 380 with respect to the second part 330 may vary in a range of about 1° to about 85° between the first position 382 and the second position 384 or in a range of about 5° to about 10° between the first position 382 and the second position 384.

[0045] According to various examples, upon an application of the predefined force to the end cap, a magnitude of the change in the angle between the cross ribs 380 and the second part 330 and / or the displacement distance 385 changes with an amount of force applied to the end cap within a predefined force range. In some examples, the magnitude of the change in the angle between the cross ribs 380 and the second part 330 is not proportional with respect to the amount of force applied within the Docket No. 0444.000247W001

[0046] DCI Ref. 00011033 -WOOl predefined force range. In an example, the angle may increase as the amount of force applied increases.

[0047] While the cross ribs 380 shown in FIG. 3 are all substantially similar to other cross ribs, it is to be understood that at least some of the cross ribs may vary. For example, at least some cross ribs may have a different shape and / or size when compared to at least one other cross rib. In some examples, at least one of the cross ribs 380 extends from the second part 330 at a different angle than at least one other of the cross ribs 380 when experiencing the same force. In some examples, the spacing between at least two consecutive cross ribs 380 is different from the spacing between at least two other consecutive cross ribs 380.

[0048] An access cover 390 may be disposed over the filter cartridge 300. A trough 370 may be disposed on an outside surface of the second part 330 and may be configured to receive a counter rib 391 on the access cover 390. The trough 370 and counter rib 391 arrangement helps to position and align the access cover 390 over the filter cartridge 300. According to various examples, when the predefined axial force or force range is applied to the access cover 390 and the counter rib 391, the cross ribs 380 will bend and the second part 330 moves in relation to the first part 325 in the direction of arrow 392. This movement will cause the second part 330 to move away from the first part 325. A counter force will push the first part 325 and the filter cartridge 300 in a longitudinal direction away from the first axial end 126. The counter force may be used to constrain the filter cartridge 300 and avoid, minimize, or reduce unwanted movement or vibrations. The shape, size, and / or material of the cross ribs may be designed as such to balance and / or optimize between counter force, force applied to the end cap 320, elasticity of the material and / or plastic creep. For example, a counterforce may be sufficient such that creep is low enough for the filter cartridge 300 to provide sufficient force for the full service cycle.

[0049] FIGS. 4A - 4C illustrate another example of an axial flexible feature having cross ribs in accordance with embodiments described herein. The end cap 420 has a plurality of cross ribs 480 that extend between the first part 425 and the second part 430. In this example, the first part 425 and the second part 430 have an outer surface that is circular and a circumference of the second part 430 is larger than the circumference of the first part 425. In this example, each of the cross-ribs 480 extend between the first part 425 and the second part 430 Docket No. 0444.000247W001

[0050] DCI Ref. 00011033 -WOOl

[0051] The cross ribs 480 are configured to deform upon application of a predefined force or a range of predefined forces. For example, the predefined force may be in a range of about 0 N to about 300 N. Upon deformation of the end cap 420 with the application of the predefined force range, a displacement distance 485 between the first part 425 and the second part 430 increases. For example, the displacement distance 485 may increase in a range of about 0% to about 50% or in a range of about 0% to about 35%. In some examples, upon an application of force to the second part 430, a counterforce pushes the first part 425 and the filter cartridge 400 towards the second part 430 such that the first part 425 is displaced relative to the second part 430 by the displacement distance 485. According to various examples, upon an application of a force to the end cap, a magnitude of the change in the angle between the cross ribs 480 and the second part 430 and / or the displacement distance 485 changes with an amount of force applied to the end cap within a predefined force range. In some examples, the magnitude of the change and / or the displacement distance 485 is not proportional with respect to the amount of force applied within the predefined force range.

[0052] FIG. 4C shows more detail of a relationship between the end cap 420, the housing 498, and the access cover 490 according to various examples. A trough 432 may be coupled to an outside surface of the second part 430 and may be configured to receive a counter rib 491 on the access cover 490. The trough 432 and counter rib 491 arrangement helps to position and align the access cover 490 over the filter cartridge 400. Similarly, a reverse trough 434 may be positioned on the second part 430 opposite the trough 432. The reverse trough 434 is configured to receive a housing cross rib 488 disposed on the housing 498. The reverse trough 434 and housing counter rib 488 arrangement helps to position and align the end cap 420 with the housing 498.

[0053] FIG. 5A-5E illustrates another example having cross ribs in accordance with embodiments described herein. In this example, a plurality of cross ribs 580 couple the first part 525 to the second part 530. In this example, the ribs deflect upon application of an axial force, such that a distance between a maximum 592 and a local minimum 594 decreases upon the application of the predefined force. A distance A 596 between the end cap 520 and a housing body 598 of the filter assembly decreases. This allows for manufacturing differences in the length of the filter element 500 and Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl the housing. According to various examples, a length measured along the longitudinal axis and a distance between the first part and the second part is in a range of about 0.75% to about 75% of a percentage of the length of the filter cartridge or in a range of about 0.75-about 37.5% of a length of the filter cartridge. .

[0054] In this example, the second part of outer ring 576 may be used as a spacer between the housing body 598 and the access cover 590. The second part of the outer ring 576 may be used to provide a specified fit to the housing. If the filter element is not installed or the outer ring 576 is missing, the latches are not able to latch. In this example, the filter cartridge may be made longer than the housing 598 such that the filter cartridge element 500 is a bit too long. When in a neutral position, the outer ring 576 is at a distance 596 from the edge of the housing body 598. When the access cover 590 is installed, it presses the outer ring 576 against the housing body 598, resulting in a downward force on the filter cartridge element 500. The ribs provide an axial tolerance such that when the access cover 590 applies an axial force, the longer filter cartridge element may be accommodated within tolerance limits and the access cover 590 is still able to latch to the housing 598.

[0055] FIG. 5E shows more detail of a relationship between the end cap 520, the housing 598, and the access cover 590 according to various examples. A trough 532 may be disposed on the second part 530 (for example on the outer ring 576) and may be configured to receive a counter rib 591 on the access cover 590. The trough 532 and counter rib 591 arrangement helps to position and align the access cover 590 over the filter cartridge 500. Similarly, a reverse trough 534 may be positioned on the second part 530 opposite the trough 532. The reverse trough 534 is configured to receive a housing cross rib 588 disposed on the housing 598. The reverse trough 534 and housing counter rib 588 arrangement helps to position and align the end cap 520 with the housing 598.

[0056] Statement of the Embodiments

[0057] Example Exl. A filter cartridge, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed an axial distance from the first part along the longitudinal axis between the Docket No. 0444.000247W001

[0058] DCI Ref. 00011033 -WOOl first part and the second part; and an axial flexible feature disposed between the first part and the second part, the axial flexible feature configured to allow a deflection of the axial feature between the first part and at least a portion of the second part along the longitudinal axis between the first end and the second end.

[0059] Example Ex2. The filter cartridge of Exl, wherein the axial flexible feature comprises a plurality of cross ribs coupled between the first part and the second part.

[0060] Example Ex3. The filter cartridge of Ex2, wherein the cross ribs are linear.

[0061] Example Ex4. The filter cartridge of Ex2 or Ex3, wherein the cross ribs are disposed in a transverse direction with respect to the first part and the second part.

[0062] Example Ex5. The filter cartridge of any of Ex2-Ex4, wherein upon an application of a force to the end cap, an angle of the cross ribs between the first part and the second part changes, a magnitude of angle change being proportional to an amount of force applied to the end cap within a predefined force range.

[0063] Example Ex6. The filter cartridge of any of Ex2-Ex5, wherein upon an application of force to the end cap, the cross ribs approach orthogonality with respect to the first part and the second part.

[0064] Example Ex7. The filter cartridge of any of Ex2-Ex6 wherein the second part comprises a ring, wherein the cross ribs are disposed between the first part and the ring.

[0065] Example Ex8. The filter cartridge of any of Ex2-Ex7, wherein upon an application of force to the second part, a counterforce pushes the first end and the filter cartridge towards the second end such that the first end is displaced relative to the second end by a displacement distance.

[0066] Example Ex9. The filter cartridge of Ex8, wherein the force is an axial force. Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl

[0067] Example ExlO. The filter cartridge of Ex9, wherein the axial force is in a range of 0 N to 300 N.

[0068] Example Exl 1. The filter cartridge of any of Ex8-Exl0, wherein the displacement distance is in a range of about 0% to about 50% of a percentage of a height of the axial flexible feature measured along a longitudinal axis of the filter cartridge.

[0069] Example Exl2. The filter cartridge of any of Ex8-Exl 1, wherein the displacement distance is in a range of about 0% to about 35% of a percentage of a height of the axial flexible feature measured along a longitudinal axis of the filter cartridge.

[0070] Example Exl3. The filter cartridge of any of Exl-Exl2, further comprising a trough coupled to the end cap proximate the second part, the trough configured to receive a counter rib on a housing.

[0071] Example Exl4. The filter cartridge of any of Exl-Exl3, wherein the axial flexible feature is configured to constrain the filter cartridge and minimize vibrations.

[0072] Example Exl 5. The filter cartridge of any of Exl -Ex 14, wherein the filter cartridge has a length measured along the longitudinal axis and a distance between the first part and the second part is in a range of about 0.75% to about 75% of a percentage of the length.

[0073] Example Exl6. The filter cartridge of any of Exl-Exl5, wherein the filter cartridge has a length measured along the longitudinal axis and a distance between the first part and the second part is in a range of about 0.75% to about 37.5% of a percentage of the length.

[0074] Example Exl7. The filter cartridge of any of Exl-Exl6, wherein the axial flexible feature comprises: a first feature disposed proximate a center of the end cap along a horizontal axis; and a second feature disposed around the first feature and radially outward from the first feature. Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl

[0075] Example Exl8. The filter cartridge of Ex 17, wherein the first feature has a first shape and the second feature has a second shape, the second shape different than the first shape.

[0076] Example Exl9. The filter cartridge of Exl8, wherein the first shape is a truncated cone, a base of the truncated cone disposed proximate the second part.

[0077] Example Ex20. The filter cartridge of Exl9, wherein the truncated cone is linearly truncated along a horizontal axis of the filter cartridge.

[0078] Example Ex21. The filter cartridge of Exl9 or Ex20, wherein upon an application of force to the axial flexible feature, an apex of the truncated cone is displaced relative to the first part by a displacement distance.

[0079] Example Ex22. The filter cartridge of Ex21, wherein the displacement distance is in a range of about 0% to about 40% of a percentage of a height of the first feature measured along a longitudinal axis of the filter cartridge.

[0080] Example Ex23. The filter cartridge of Ex21 or Ex 22, wherein the displacement distance is in a range of about 0% to about 30% of a percentage of a height of the first feature measured along a longitudinal axis of the filter cartridge.

[0081] Example Ex24. The filter cartridge of any of Exl8-Ex23, wherein the second shape is a ridge having a first ridge side comprising a local maximum of the ridge and a second ridge side, the first ridge side disposed closer to the first side than the second ridge side.

[0082] Example Ex25. The filter cartridge of Ex24, wherein the ridge shape is a U-shape.

[0083] Example Ex26. The filter cartridge of Ex24 or Ex25, wherein the ridge shape extends in a circle around the first shape. Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl

[0084] Example Ex27. A filter cartridge for an air cleaner assembly, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed distal from the first part along the longitudinal axis between the first end and the second end; and a plurality of flexible linear cross ribs coupled between the first part and the second part, the plurality of flexible linear cross ribs configured to allow a deflection between the first part and the second part along the longitudinal axis between the first end and the second end.

[0085] Example Ex28. The filter cartridge of Ex27, wherein the cross ribs are disposed in a transverse direction with respect to the first part and the second part.

[0086] Example Ex29. The filter cartridge of Ex27 or Ex28, wherein upon an application of a force to the end cap, an angle of the cross ribs between the first part and the second part changes, a magnitude of angle change being proportional to an amount of force applied to the end cap within a predefined force range.

[0087] Example Ex30. The filter cartridge of any of Ex27-Ex29, wherein upon an application of force to the end cap, the cross ribs approach orthogonality with respect to the first part and the second part.

[0088] Example Ex3 E The filter cartridge of any of Ex27-Ex30, wherein the second part comprises a ring, wherein the cross ribs are disposed between the first part and the ring.

[0089] Example Ex32. The filter cartridge of any of Ex27-Ex31, wherein upon an application of force to the second part, a counterforce pushes the first end and the filter cartridge towards the second end such that the first end is displaced relative to the second end by a displacement distance.

[0090] Example Ex33. The filter cartridge of Ex32, wherein the force is an axial force. Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl

[0091] Example Ex34. The filter cartridge of any of Ex27-Ex33, further comprising a trough coupled to the end cap proximate the second part, the trough configured to receive a counter rib on a housing of the filter cartridge.

[0092] Example Ex35. The filter cartridge of any of Ex27-Ex34, wherein the cross ribs are linear.

[0093] Example Ex36. A filter cartridge for an air cleaner assembly, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed distal from the first part along the longitudinal axis between the first end and the second end; a first flexible feature disposed proximate a center of the end cap along a horizontal axis; and a second flexible feature disposed around the first feature and radially outward from the first feature, at least one of the first flexible feature and the second flexible feature configured to allow a deflection between the first part and at least a portion of the second part along the longitudinal axis between the first part and the second part.

[0094] Example Ex37. The filter cartridge of Ex36, wherein the first feature has a first shape and the second feature has a second shape, the second shape different than the first shape.

[0095] Example Ex38. The filter cartridge of Ex37, wherein the first shape is a truncated cone, a base of the truncated cone disposed proximate the second part.

[0096] Example Ex39. The filter cartridge of Ex38, wherein the truncated cone is linearly truncated along a horizontal axis of the filter cartridge.

[0097] Example Ex40. The filter cartridge of any of Ex37-Ex39, wherein the second shape is a ridge having a first ridge side comprising a local maximum of the ridge and a second ridge side, the first ridge side disposed closer to the first side than the second ridge side. Docket No. 0444.000247W001

[0098] DCI Ref. 00011033 -WOOl

[0099] Example Ex41. The filter cartridge of Ex40, wherein the ridge is a U-shape.

[0100] Example Ex42. The filter cartridge of Ex40 or Ex41, wherein the ridge extends in a circle around the first shape.

[0101] It should also be noted that, as used in this specification and the appended claims, the phrase “configured” describes a system, apparatus, or other structure that is constructed to perform a particular task or adopt a particular configuration. The word "configured" can be used interchangeably with similar words such as “arranged,” “constructed,” “manufactured,” and the like.

[0102] This application is intended to cover adaptations or variations of the present subject matter. It is to be understood that the above description is intended to be illustrative, and not restrictive, and the claims are not limited to the illustrative embodiments as set forth herein

Claims

Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOlWe claim:

1. A filter cartridge, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed an axial distance from the first part along the longitudinal axis between the first part and the second part; and an axial flexible feature disposed between the first part and the second part, the axial flexible feature configured to allow a deflection of the axial feature between the first part and at least a portion of the second part along the longitudinal axis between the first end and the second end.

2. The filter cartridge of claim 1, wherein the axial flexible feature comprises a plurality of cross ribs coupled between the first part and the second part.

3. The filter cartridge of claim 2, wherein the cross ribs are linear.

4. The filter cartridge of claim 2, wherein the cross ribs are disposed in a transverse direction with respect to the first part and the second part.

5. The filter cartridge of claim 2, wherein upon an application of a force to the end cap, an angle of the cross ribs between the first part and the second part changes, a magnitude of angle change being proportional to an amount of force applied to the end cap within a predefined force range.

6. The filter cartridge of claim 2, wherein upon an application of force to the end cap, the cross ribs approach orthogonality with respect to the first part and the second part.

7. The filter cartridge of claim 2 wherein the second part comprises a ring, wherein the cross ribs are disposed between the first part and the ring.Docket No. 0444.000247W001DCI Ref. 00011033 -WOOl8. The filter cartridge of claim 2, wherein upon an application of force to the second part, a counterforce pushes the first end and the filter cartridge towards the second end such that the first end is displaced relative to the second end by a displacement distance.

9. The filter cartridge of claim 8, wherein the force is an axial force.

10. The filter cartridge of claim 9, wherein the axial force is in a range of 0 N to 300 N.

11. The filter cartridge of claim 8, wherein the displacement distance is in a range of about 0% to about 50% of a percentage of a height of the axial flexible feature measured along a longitudinal axis of the filter cartridge.

12. The filter cartridge of claim 8, wherein the displacement distance is in a range of about 0% to about 35% of a percentage of a height of the axial flexible feature measured along a longitudinal axis of the filter cartridge.

13. The filter cartridge of claim 1, further comprising a trough coupled to the end cap proximate the second part, the trough configured to receive a counter rib on a housing.

14. The filter cartridge of claim 1, wherein the axial flexible feature is configured to constrain the filter cartridge and minimize vibrations.

15. The filter cartridge of claim 1, wherein the filter cartridge has a length measured along the longitudinal axis and a distance between the first part and the second part is in a range of about 0.75% to about 75% of a percentage of the length.

16. The filter cartridge of claim 1, wherein the filter cartridge has a length measured along the longitudinal axis and a distance between the first part and the second part is in a range of about 0.75% to about 37.5% of a percentage of the length.Docket No. 0444.000247W001DCI Ref. 00011033 -WOOl17. The filter cartridge of claim 1, wherein the axial flexible feature comprises: a first feature disposed proximate a center of the end cap along a horizontal axis; and a second feature disposed around the first feature and radially outward from the first feature.

18. The filter cartridge of claim 17, wherein the first feature has a first shape and the second feature has a second shape, the second shape different than the first shape.

19. The filter cartridge of claim 18, wherein the first shape is a truncated cone, a base of the truncated cone disposed proximate the second part.

20. The filter cartridge of claim 19, wherein the truncated cone is linearly truncated along a horizontal axis of the filter cartridge.

21. The filter cartridge of claim 19, wherein upon an application of force to the axial flexible feature, an apex of the truncated cone is displaced relative to the first part by a displacement distance.

22. The filter cartridge of claim 21, wherein the displacement distance is in a range of about 0% to about 40% of a percentage of a height of the first feature measured along a longitudinal axis of the filter cartridge.

23. The filter cartridge of claim 21, wherein the displacement distance is in a range of about 0% to about 30% of a percentage of a height of the first feature measured along a longitudinal axis of the filter cartridge.

24. The filter cartridge of claim 18, wherein the second shape is a ridge having a first ridge side comprising a local maximum of the ridge and a second ridge side, the first ridge side disposed closer to the first side than the second ridge side.

25. The filter cartridge of claim 24, wherein the ridge shape is a U-shape.Docket No. 0444.000247W001DCI Ref. 00011033 -WOOl26. The filter cartridge of claim 24, wherein the ridge shape extends in a circle around the first shape.

27. A filter cartridge for an air cleaner assembly, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed distal from the first part along the longitudinal axis between the first end and the second end; and a plurality of flexible linear cross ribs coupled between the first part and the second part, the plurality of flexible linear cross ribs configured to allow a deflection between the first part and the second part along the longitudinal axis between the first end and the second end.

28. The filter cartridge of claim 27, wherein the cross ribs are disposed in a transverse direction with respect to the first part and the second part.

29. The filter cartridge of claim 27, wherein upon an application of a force to the end cap, an angle of the cross ribs between the first part and the second part changes, a magnitude of angle change being proportional to an amount of force applied to the end cap within a predefined force range.

30. The filter cartridge of claim 27, wherein upon an application of force to the end cap, the cross ribs approach orthogonality with respect to the first part and the second part.

31. The filter cartridge of claim 27, wherein the second part comprises a ring, wherein the cross ribs are disposed between the first part and the ring.Docket No. 0444.000247W001 DCI Ref. 00011033 -WOOl32. The filter cartridge of claim 27, wherein upon an application of force to the second part, a counterforce pushes the first end and the filter cartridge towards the second end such that the first end is displaced relative to the second end by a displacement distance.

33. The filter cartridge of claim 32, wherein the force is an axial force.

34. The filter cartridge of claim 27, further comprising a trough coupled to the end cap proximate the second part, the trough configured to receive a counter rib on a housing of the filter cartridge.

35. The filter cartridge of claim 27, wherein the cross ribs are linear.

36. A filter cartridge for an air cleaner assembly, the filter cartridge comprising: a filtration media arrangement extending along a longitudinal axis between a first end and a second end and defining an internal volume of the filter cartridge; and an end cap arranged at the first end of the filtration media, the end cap comprising: a first part; a second part disposed distal from the first part along the longitudinal axis between the first end and the second end; a first flexible feature disposed proximate a center of the end cap along a horizontal axis; and a second flexible feature disposed around the first feature and radially outward from the first feature, at least one of the first flexible feature and the second flexible feature configured to allow a deflection between the first part and at least a portion of the second part along the longitudinal axis between the first part and the second part.

37. The filter cartridge of claim 36, wherein the first feature has a first shape and the second feature has a second shape, the second shape different than the first shape.

38. The filter cartridge of claim 37, wherein the first shape is a truncated cone, a base of the truncated cone disposed proximate the second part.Docket No. 0444.000247W001DCI Ref. 00011033 -WOOl39. The filter cartridge of claim 38, wherein the truncated cone is linearly truncated along a horizontal axis of the filter cartridge.

40. The filter cartridge of claim 37, wherein the second shape is a ridge having a first ridge side comprising a local maximum of the ridge and a second ridge side, the first ridge side disposed closer to the first side than the second ridge side.

41. The filter cartridge of claim 40, wherein the ridge is a U-shape.

42. The filter cartridge of claim 40, wherein the ridge extends in a circle around the first shape.

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