Patent Description:
Air or other gas filtering is desirable in a number of systems. A typical application is in the filtration of intake air to internal combustion engines. Another is in the filtration of crankcase ventilation filter assemblies. Typically, such systems comprise filter assemblies having a serviceable filter cartridge therein. After a period of use, filter media within a filter housing requires servicing, either through cleaning or complete replacement. Typically, for an air cleaner or crankcase ventilation filter assembly used with an internal combustion engine, for example, on a vehicle, the filter media is contained in a removable and replaceable, i.e. serviceable, component, typically referred as a filter element or cartridge. The filter cartridge is configured to be removably sealed within the air cleaner, in use. Improvements in filter arrangements relating to assembly, serviceability, and/or use are desirable. The filter cartridge can be provided as a first (e.g., primary) filter cartridge or a second (e.g., secondary or safety) filter cartridge. The air cleaner assembly can contain only a first filter cartridge or both a first filter cartridge and a second filter cartridge.

<CIT> discloses a filter element for a filter assembly in particular for filtering air. The filter element has a supporting edge which engages the housing and generates a force in the direction of the airflow through the filter. A sealing face and the supporting edge have a sharp angle between them. <CIT> and <CIT> disclose similar filter assemblies.

An air cleaner assembly is disclosed. In one aspect, the air cleaner assembly includes a housing defining an inlet and an outlet, and including an access opening between the inlet and outlet. The air cleaner also includes a filter cartridge received within the housing and covering the access opening. The air cleaner also includes a lock mechanism. The lock mechanism is movable between an unlocked position in which the filter cartridge can be installed and removed from the housing and a locked position in which the filter cartridge is secured within the housing. The filter cartridge and lock mechanism include interacting features allowing the lock mechanism to be moved from the unlocked position to the locked position only when the filter cartridge is installed within the housing.

The present invention will be further explained with reference to the appended Figures, wherein like structure is referred to by like numerals throughout the several views, and wherein;.

Herein, example filter assemblies, filter cartridges, features and components therefor are described and depicted. A variety of specific features and components are characterized in detail. Many can be applied to provide advantage. There is no specific requirement that the various individual features and components be applied in an overall assembly with all of the features and characteristics described, however, in order to provide for some benefit in accord with the present disclosure.

It is noted that a plurality of embodiments are depicted and described. The embodiments are not meant to be exclusive with respect to features depicted. That is, selected features of one embodiment can be applied in one or more of the other embodiments if desired, to advantage. In many examples, the filter assembly depicted is an air cleaner assembly, for example, used to filter intake air for an internal combustion engine. Additional applications are possible, for example, applications in which the filter assembly is a crankcase ventilation filter assembly, in which the filter cartridge is used to filter crankcase blowby gases which include, typically, both particulate and liquid contaminant therein. Both type of filter assemblies are generally "gas filter assemblies," since the carrier stage being filtered is gas (air or crankcase ventilation gases). While the techniques described herein will typically be used in application for gas filtration, they can be used in the filtration of other materials, for example, liquids, if desired.

Referring to <FIG>, aspects of an air cleaner <NUM> in accordance with an embodiment of the invention are presented. As shown, the air cleaner <NUM> includes a housing assembly <NUM> including a main housing body <NUM> defining within which a removable filter cartridge <NUM> is disposed. The air cleaner <NUM> includes a housing assembly <NUM> with a housing body <NUM> defining an interior region 20a within which a primary removable filter cartridge <NUM> is disposed. The housing assembly <NUM> further includes an outlet assembly <NUM> that is positioned for exit of filtered air. In the embodiment presented, the air outlet assembly <NUM> defines an interior region 40a within which a secondary removable filter cartridge <NUM> is disposed The outlet assembly <NUM> can be made separately from the housing body <NUM> and attached thereto, or it can be integrally constructed as a portion of the housing body <NUM>. The housing assembly <NUM> further includes an inlet assembly <NUM> through which air to be filtered enters the assembly <NUM>. The inlet assembly <NUM> can be made separately from the housing body <NUM> and attached thereto, or it can be integrally constructed as a portion of the housing <NUM>. In the embodiment disclosed, and as explained in detail later in this section, the housing assembly <NUM> is modular in configuration in which the outlet and inlet assemblies <NUM>, <NUM> are separate assemblies secured to the housing body <NUM>.

The air cleaner <NUM> can include an access cover <NUM> to provide access to the interior region 20a of the housing body <NUM>, such as for placement and removal of filter cartridges <NUM>, <NUM>. The access cover <NUM> may be a separate component or may be an integral feature of another component of the air filter cartridge <NUM>, for example integral with the circumferential shell of the filter cartridge <NUM>. In the embodiment disclosed herein, the access cover <NUM> is integral to the air filter cartridge <NUM>. In one aspect of the disclosure, the access cover <NUM>, and thus the filter cartridge <NUM>, are secured to the housing body <NUM> via a pair of connectors or lock mechanisms <NUM>.

In one aspect, the air filter cartridge <NUM> can be configured such that it has an axis of symmetry about a plane passing through the longitudinal axis of the air filter cartridge <NUM>. Such a configuration can allow for the air filter cartridge <NUM> to be installed in either direction while still interacting in a satisfactory way with the mating parts of the housing body <NUM> and lock mechanisms <NUM>.

Referring to <FIG>, the housing body <NUM> is shown in isolation. As presented, the housing body <NUM> is unitarily formed as a single component from a polymeric material, such as nylon, polypropylene, or ABS plastic. In one aspect, the housing body <NUM> extends between a first end 20a and a second end 20b and defines and interior region 20i. The housing body <NUM> can be characterized as having a central portion <NUM>, an inlet portion <NUM>, and an outlet portion <NUM>. Although the terms "inlet portion" and "outlet portion" are used herein, it should be understood that, because of the configuration of the housing body <NUM>, the inlet portion <NUM> can serve as the outlet end of the housing body <NUM> and the outlet portion <NUM> can serve as the inlet portion of the housing body <NUM>. In general, the central portion <NUM> retains the filter cartridge <NUM>, the inlet portion <NUM> secures the air inlet assembly <NUM> to the housing body <NUM> and also supports one of the lock mechanisms <NUM>, and the outlet portion <NUM> secures the air outlet assembly <NUM> to the housing body <NUM> and also supports the other lock mechanism <NUM>.

In one aspect, the central portion <NUM> of the housing body <NUM> is defined by a sidewall 22a extending between a first end wall 22b proximate the inlet portion <NUM> and a second end wall 22c proximate the outlet portion <NUM>. Each of the first and second end walls 22b, 22c respectively define openings 22d, 22e through which air can flow through the housing body <NUM>. The central portion <NUM> further defines an access opening 22f through which the filter cartridge <NUM> can be installed. The access opening 22f is also sized such that the outlet assembly <NUM> and the inlet assembly <NUM> can be inserted through the access opening 22f during assembly of the housing assembly <NUM>. In one aspect, the access opening 22f is provided with a grooved structure defining an open channel <NUM> for receiving a seal member, such as an O-ring, such that access cover <NUM> can be adequately sealed against the housing body <NUM>. Referring to <FIG> and <FIG>, an alternative air cleaner design is shown in which the access opening 22f has a varying profile with a transversely or radially recessed portion 22f1 that can be used to enhance positive location of the filter cartridge <NUM> during insertion.

The inlet portion <NUM> of the housing body <NUM> is shown as being provided with a circumferential sidewall 24a with a rectangular shape with rounded ends or corners (e.g. a race track shape). Within the sidewall 24a, a plurality of oppositely arranged and spaced apart apertures 24b are provided. The apertures 24b are for receiving cooperatively shaped latch members of the air inlet assembly <NUM> to facilitate a snap-fit type connection between the housing body <NUM> and the air inlet assembly <NUM>. The inlet portion <NUM> is also provided with a mounting structure 24c proximate the access opening 22f. The mounting structure 24c provides a structure to which the lock mechanism <NUM> can be mounted. As shown, the mounting structure 24c is defined by a pair of spaced apart, parallel L-shaped channel or rib members 24d extending in a lengthwise direction of the housing body <NUM>. The inlet portion <NUM> is further provided with a cut-out portion 24e within the sidewall 24a to facilitate mounting of a dust ejector in a desired location and orientation, as is explained later in this section.

The outlet portion <NUM> of the housing body <NUM> is shown as being provided with a circumferential sidewall 26a with a rectangular shape with rounded ends or corners (e.g. a race track shape). Within the sidewall 26a, a plurality of oppositely arranged and spaced apart apertures 26b are provided. The apertures 26b are for receiving cooperatively shaped latch members of the air outlet assembly <NUM> to facilitate a snap-fit type connection between the housing body <NUM> and the air outlet assembly <NUM>. The outlet portion <NUM> is also provided with a mounting structure 26c proximate the access opening 22f. The mounting structure 26c provides a structure to which the lock mechanism <NUM> can be mounted. As shown, the mounting structure 26c is defined by a pair of spaced apart, parallel L-shaped channel or rib members 26d extending in a lengthwise direction of the housing body <NUM>. Although not shown, the outlet portion <NUM> can be further provided with a cut-out portion similar to 24e within the sidewall 26a to facilitate mounting of a dust ejector in a desired location and orientation where the air cleaner is configured for air to flow from the portion <NUM> to the portion <NUM>.

Referring to <FIG>, the outlet assembly <NUM>, is shown in further detail. For the purpose of clarity, the filter cartridge <NUM> is not shown as being installed within the outlet assembly at <FIG>. As presented, the outlet assembly <NUM> includes an outlet body <NUM> and flow restriction indicator <NUM>. The flow restriction indicator <NUM> is a dial-type gauge that snap-fits into the outlet assembly <NUM>. As shown, the outlet body <NUM> is defined by a sidewall 42a extending between a first end 42b and a second end 42c. In one aspect, the sidewall 42a includes a contoured portion 42d for receiving and sealing with a portion of a seal member <NUM> associated with the secondary filter cartridge <NUM>. The interior of the sidewall 42a forms the remaining portion of the seal interface with the secondary filter cartridge seal member <NUM>. The sidewall 42a is also shown as being provided with latch portions 42e, each of which having a ramped surface 42f and a shoulder surface <NUM>. The latch portions 42e interact with the apertures 26b in the housing body <NUM> such that a snap-fit connection can be formed between the housing assembly <NUM> and the outlet assembly <NUM>.

The outlet assembly <NUM> is also shown as being provided with a flange structure <NUM> adjoining the first end 42b of the outlet body sidewall 42a. In one aspect, the flange structure <NUM> is defined by a first flange portion 46a and a second flange portion 46c that each extending radially outwardly from the sidewall 42a. In one aspect, the flange portions 46a, 46c define a mounting surface 46b on one side of the flange structure <NUM> and a sealing surface 46c on an opposite side of the flange structure <NUM>.

In the embodiment shown, the sealing surface 46c of the first flange portion 46a is disposed at an angle a1 to a longitudinal axis X of the air cleaner <NUM> and outlet assembly <NUM>. In one aspect, the angle a1 is an oblique or non-orthogonal angle. In the example shown, the angle a1 is <NUM> degrees. However, other angles are possible, such as angles ranging between <NUM> and <NUM> degrees, for example <NUM> degrees. In some examples, the angle a1 is minimized such that the surface area of the sidewall 42a between the flange portions 46a, 46c is similarly minimized such that debris falling into the interior region 20i is less able to collect on the resulting ledge area of the sidewall 42a, for example when the filter cartridge <NUM> is being removed. In one aspect, the first and second flange portions 46a, 46c are disposed at an angle a2 with respect to each other. In the example shown, the angle a2 is greater than zero and less than <NUM> degrees such that the first and second flange portions 46a, 46c are disposed in a non-parallel relationship. In the example shown, the angel a2 is about <NUM> degrees. Where the outlet end of the media pack <NUM> is orthogonal to the longitudinal axis X, the angles a1 and a2 can also be said to be at an oblique angle to the outlet end <NUM>. As the seal surfaces 132b, 132c of the seal member <NUM> can be defined by the angles a1, a2 of the flange portions 46a, 46c, the seal surfaces 132b, 132c can likewise have the angles specified above. Other angles are possible.

When the outlet assembly <NUM> is inserted through the housing body access opening 22f such that the outlet assembly <NUM> resides within the interior region 20i of the housing body <NUM>, the outlet assembly <NUM> can be pushed forward towards the housing body outlet portion <NUM> (or inlet portion <NUM>) until the mounting surface 46b abuts the end wall 22c of the housing body <NUM>. This position is most easily seen in the cross-sectional views of <FIG> and <FIG>. The end wall 22c provides a positive stop against the mounting surface 46b of the first flange portion 46a. During this action, the ramped surface 42f of each of the latch portions 42e ride along the interior surface of the sidewall 26a until the outlet body <NUM> is sufficiently inserted for the latch portions 42e to be fully received into the apertures 26b. At this point, the shoulder surfaces <NUM> of the latch portions 42e lock against an edge of the apertures 26b in a snap-fit type of connection, wherein the outlet housing <NUM> is locked from further movement by the latch portions 42e and the end wall 22c.

In one aspect, the second flange portion 46c adjoins the first flange portion 46a to form the seal surface 46d opposite the mounting surface 46b. The seal surface 46d provides a surface against which a correspondingly shaped seal member of the filter cartridge <NUM> can form a seal. As the first flange portion 46a and second flange portion 46c are arranged in a non-parallel relationship, the portion 46e of the seal surface 46d defined by the first flange portion 46a is disposed at the angle a2 to the portion 46f of the seal surface 46d defined by the second flange portion 46c. Accordingly, the seal surface 46d can be said to have a compound shape or profile. At the location <NUM> of the seal surface 46d where the first and second seal portions 46e, 46f adjoin, the seal surface 46d is curved such that a smooth transition exists. Stated another way, the first and second seal portions 46e, 46f are planar with a curved portion <NUM> connecting the portions 46e, 46f. In some examples, all or part of the seal surface 46d is curved rather than being planar. For example, either or both of the first and second seal portions 46e, 46f can be curved rather than being planar. In the example shown, the first seal portion 46e represents less than half of the total seal surface 46d, and thus has a lesser length than that of the second seal portion 46f.

The outlet assembly <NUM> is also provided with an outlet end <NUM> defined by an end wall 48a and an outlet tube 48b to which a hose or duct can be connected. The outlet end <NUM> is also shown as including internal sidewalls or ribs 48c for interacting with the filter cartridge <NUM>. The outlet end <NUM> is further shown as also including a sidewall or well 48d for receiving the restriction indicator <NUM>.

One advantage of the presented configuration, due to the disclosed modular design, is that differently configured outlet assemblies <NUM> can be mounted onto the housing body <NUM> to suit any particular application. For example, the outlet assembly could be provided with a differently sized or shaped outlet tube or duct, could be provided without a restriction indicator, or could be provided with additional ports for the installation of electronic sensors. Accordingly, the disclosure is not necessarily limited to the specific outlet assembly configuration described herein as other or different features may be included.

Referring to <FIG>, aspects of the inlet assembly <NUM> are shown in greater detail. As presented, the inlet assembly <NUM> includes an inlet body <NUM>, a precleaner assembly <NUM>, and a dust ejection assembly <NUM>. In one aspect, the precleaner assembly <NUM> generally is used to clean selected material or contaminants carried by an air stream into the air cleaner assembly <NUM> before the air reaches the filter cartridge <NUM> positioned therein. The precleaner <NUM> generally includes a sidewall 62a bounding an end wall 62b through which a plurality of cyclonic separator tubes <NUM> extend. In the embodiment shown in the drawings, <NUM> separator tubes <NUM> are provided. More or fewer separator tubes <NUM> can be provided.

The inlet body <NUM> is also shown as including a sidewall 52a bounding an end wall 52b. A plurality of receptacles <NUM> are shown as being provided on and extending through the end wall 52b. The receptacles <NUM> are received into the outlets of the separator tubes <NUM> when the precleaner assembly <NUM> is installed into the inlet body <NUM>, wherein the sidewall 62a slides within the sidewall 52a. In the example presented, the precleaner assembly <NUM> can be secured via a fastener 62c (e.g. a threaded screw or bolt) extending into a threaded opening 52c in the end wall 52b of the inlet body <NUM>.

In operation, contaminants are separated to the outside walls of the separator tubes <NUM> and are collected within the interior space defined between end walls 62b, 52b and the sidewall 52a and are then ejected out of the dust ejection port assembly <NUM>. The relatively contaminant free air passing through the central portions of the separator tubes <NUM> is received by the receptacles <NUM> where the air can pass through the end wall 52b and into the interior region 20i where the air can be received by the filter cartridge <NUM> for further cleaning.

As can be most easily seen at <FIG> and <NUM>-<NUM>, the dust ejection assembly including a dust ejection port <NUM> mounted through an opening in the inlet body sidewall 52a and a retaining clip <NUM> securing the dust ejection port <NUM> to the sidewall 52a. As opposed to typical prior art assemblies in which the dust ejection port is molded into the precleaner assembly or part of the air cleaner housing, the dust ejection assembly <NUM> disclosed herein is removable and can be mounted in multiple locations, where the air cleaner <NUM> is provided with multiple openings 52d. The inlet assembly <NUM> is installed through the access opening 22f of the housing body <NUM> in a manner similar to that already described for the inlet assembly <NUM>. The removability of the dust ejection assembly <NUM> facilitates this assembly process, as insufficient clearance would result if the dust ejection port <NUM> were non-removable and assembly through the access opening 22f were attempted. Once the inlet assembly <NUM> is installed onto the main body <NUM>, the dust ejection port <NUM> can be inserted into the opening 52d in the inlet body <NUM>.

With reference to <FIG>, the dust ejection port <NUM> is defined by a tubular sidewall 67a that extends to a flange 67b. During insertion of the dust ejection port <NUM> into the inlet body opening 52d in a direction from the outside of the sidewall 52a towards the interior defined by the sidewall 52a, the flange 67b acts as a stop to prevent further insertion into the interior. In one aspect, the flange 67b is provided with a complementary shape to the profile of the sidewall 52a such that a generally flush fit arrangement between the flange 67b and the sidewall 52a exists. In the example shown, both the sidewall 52a, at the location of opening 52d, and the flange 67b are curved. However, where the mounting location of the dust ejection assembly <NUM> is along a flat side of the inlet body sidewall 52a, the flange 67b can be planar or flat.

The dust ejection port <NUM> is further provided with a pair of retaining flanges or ears 67c that pass through the inlet body opening 52d when the flange 67b is abutted with the sidewall 52a. The retaining flanges 67b are received by the retaining clip <NUM> which includes a sidewall 68a defining an opening 68b with a narrowed opening area 68c for receiving a narrowed neck region of the tubular sidewall 67a between the flanges 67b, 67c of the dust ejection port <NUM>. The narrowed opening area 68c enables for a snap-fit type attachment between the dust ejection port <NUM> and the retaining clip <NUM>. Once the dust ejection port sidewall 67a is inserted through the opening 52d, the retaining clip <NUM> is inserted onto the ejection port sidewall 67a on the side of the inlet body sidewall 52a opposite of the flange 67b (i.e. on the interior side of sidewall 52a). Once inserted, the retaining clip <NUM> operates against the retaining flanges 67b to prevent the dust ejection port <NUM> from being removed from the inlet body <NUM>. As indicated at <FIG>, the clip <NUM> has a width w1 at the distal end of the clip which increases to a width w2 towards the opposite end of the clip <NUM> to form a ramp-like structure. Thus, as the retaining clip <NUM> is inserted, the increasing thickness of the clip <NUM> acts to bind the ejection port <NUM> in place such that the ejection port <NUM> is axially secured in place with respect to the sidewall 52a. A handle or lip member 68d is provided on the retaining clip <NUM> to facilitate manipulation of the retaining clip during insertion and removal.

Ramped sidewall members or ribs 68e can also be provided to interact with the ends of the retaining flanges 67c to prevent rotation of the ejection port <NUM> with respect to the sidewall 52a. Preventing rotation is advantageous as loosening of the connection between the retaining clip <NUM> and the ejection port <NUM> could occur with such rotation.

In one aspect, the retaining clip sidewall 68a is provided with a complementary shape to the profile of the sidewall 52a such that a generally flush fit arrangement between the sidewall 68a and the sidewall 52a exists. In the example shown, both the sidewall 52a, at the location of opening 52d, and the sidewall 68a are curved. However, where the mounting location of the dust ejection assembly <NUM> is along a flat side of the inlet body sidewall 52a, the sidewall 68a can be planar or flat.

The sidewall 52a of the inlet body <NUM> is also shown as being provided with latch portions 52e, each of which having a ramped surface 52f and a shoulder surface <NUM>. The latch portions 52e interact with the apertures 24b in the housing body <NUM> such that a snap-fit connection can be formed between the housing assembly <NUM> and the inlet assembly <NUM>.

The inlet assembly <NUM> is also shown as being provided with a flange structure <NUM> adjoining the second end 42c of the outlet body sidewall 42a. In one aspect, the flange structure <NUM> is defined by a first flange portion 56a and a second flange portion 56c that extend radially outwardly from the sidewall 52a. In one aspect, the flange portions 56a, 56c define a mounting surface 56b on one side of the flange structure <NUM> and a sealing surface 56c on the opposite side of the flange structure <NUM>.

In the embodiment shown, the first flange portion 56a is disposed at an angle a3 to a longitudinal axis X of the air cleaner <NUM> and inlet assembly <NUM>. In one aspect, the angle a3 is an oblique or non-orthogonal angle. In the example shown, the angle a1 is <NUM> degrees. However, other angles are possible, such as angles ranging between <NUM> and <NUM> degrees, for example <NUM> degrees. In one aspect, the first and second flange portions 56a, 56c are disposed at an angle a4 with respect to each other. In the example shown, the angle a4 is greater than zero and less than <NUM> degrees such that the first and second flange portions 56a, 56c are disposed in a non-parallel relationship. In the example shown, the angel a4 is about <NUM> degrees. Other angles are possible.

When the outlet assembly <NUM> is inserted through the housing body access opening 22f such that the inlet assembly <NUM> resides within the interior region 20i of the housing body <NUM>, the inlet assembly <NUM> can be pushed forward towards the housing body inlet portion <NUM> (or inlet portion) until the mounting surface 56b abuts the end wall 22b of the housing body <NUM>. This position is most easily seen in the cross-sectional views of <FIG> and 8A. The end wall 22b provides a positive stop against the mounting surface 56b of the first flange portion 56a. During this action, the ramped surface 52f of each of the latch portions 52e ride along the interior surface of the sidewall 24a until the inlet body <NUM> is sufficiently inserted for the latch portions 52e to be fully received into the apertures 24b. At this point, the shoulder surfaces <NUM> of the latch portions 52e lock against an edge of the apertures 24b in a snap-fit type of connection, wherein the inlet housing <NUM> is locked from further movement by the latch portions 52e and the end wall 22b.

In one aspect, the flange structure <NUM> adjoins the first flange portion 56a to form the seal surface 56d opposite the mounting surface 56b. The seal surface 56d provides an axial surface against which a correspondingly shaped seal member of the filter cartridge <NUM> can form a seal. Accordingly, the seal surfaces of the seal members can have the same shape or profile as explained below for the seal surfaces herein. As the first flange portion 56a and second flange portion 56c are arranged in a non-parallel relationship, the portion 56e of the seal surface 46d defined by the first flange portion 56a is disposed at the angle a4 to the portion 56f of the seal surface 56d defined by the second flange portion 56c. Accordingly, the seal surface 56d can be said to have a compound shape or profile. At the location <NUM> of the seal surface 56d where the first and second seal portions 56e, 56f adjoin, the seal surface 56d is curved such that a smooth transition exists. Stated another way, the first and second seal portions 56e, 56f are planar with a curved portion <NUM> connecting the portions 56e, 56f. In some examples, all or part of the seal surface 56d is curved rather than being planar. For example, either or both of the first and second seal portions 56e, 56f can be curved rather than being planar. In the example shown, the first seal portion 56e represents less than half of the total seal surface 56d, and thus has a lesser length than that of the second seal portion 56f.

One advantage of the presented configuration, due to the disclosed modular design, is that differently configured inlet assemblies <NUM> can be mounted onto the housing body <NUM> to suit any particular application. For example, an inlet assembly <NUM> with no precleaner, an inlet duct, a different precleaner design, and/or dust ejection assembly could be provided. Accordingly, the disclosure is not necessarily limited to the specific inlet assembly configuration described herein as other or different features may be included.

Referring now to <FIG>, an exemplary embodiment of filter cartridge <NUM> of air cleaner assembly <NUM> is illustrated. The filter cartridge <NUM> extends between a first end <NUM> and a second end <NUM>. In one aspect, the first end <NUM> can be characterized as the upstream end of the filter cartridge <NUM> while the second end <NUM> can be characterized as the downstream end of the filter cartridge <NUM>. The filter cartridge <NUM> can be considered to be the main or primary filter cartridge, and is used to selectively separate a desired amount of particulate or containment material.

Filter cartridge <NUM> is generally a service part or removable component, such that it is periodically removable and replaceable as desired or necessary during the lifetime of the air cleaner <NUM>. In particular, when the cartridge <NUM> becomes occluded or otherwise needs to be replaced, the access cover <NUM> is unlocked from the housing <NUM>, and the occluded filter <NUM> is removed by pulling the access cover in a direction R1 away from the housing <NUM> via a handle <NUM> associated with the access cover <NUM>. After such removal, another filter <NUM> can be placed in the housing <NUM> by inserting the filter cartridge <NUM> in an insertion direction I1. In one aspect, the directions I1 and R1 are orthogonal to the longitudinal axes X, X1 of the filter cartridge <NUM> and housing <NUM>. In the example shown, the access cover <NUM> is integral to the filter cartridge <NUM> and thus serves as the previously described access cover <NUM>. Similarly, the handle <NUM> is integrally formed with the access cover <NUM>. In one aspect, the handle <NUM> has a length that is a majority of the length of the media pack <NUM>. As mentioned previously, <FIG> and <FIG> show the filter cartridge <NUM> that the access opening 22f can have a varying profile with a recessed portion 22f1. In such an embodiment, the access cover <NUM> can be formed with a complementary shape to the access opening 22f such that the access cover <NUM> has a contoured shape with a protruding portion 125a that mates or abuts with the recessed portion 22f1.

The filter cartridge <NUM> generally includes a media pack <NUM>, a shell <NUM> integrally including the access cover <NUM> and the handle <NUM>, a first sealing member <NUM> at the inlet end of the media pack <NUM>, and a second sealing member <NUM> at the outlet end of the media pack <NUM>. The sealing members <NUM>, <NUM> will generally be made of a relatively flexible material and may be referred to herein as a "flexible sealing member," and can include an axial or radial sealing member. In one example, the sealing members <NUM>, <NUM> are provided as injection molded gaskets. In the embodiment shown, the sealing members <NUM>, <NUM> are provided as gaskets with alternating segments of parallel lip seals <NUM> and open-faced pocket structures <NUM>, as is described later in this section. The seal members <NUM>, <NUM> are shown in isolation at <FIG>.

In the example shown, the media pack <NUM> has inlet flow face <NUM> for receiving unfiltered air or pre-cleaned air from the precleaner (if provided) and an outlet flow face <NUM> for delivering filtered air. The media pack <NUM> is shown in isolation at <FIG>. In the example shown, the media pack <NUM> has an obround cross-sectional shape. However, other shapes are possible, such as round, oval, and rectangular cross-sectional shapes. In one aspect, the media pack <NUM> defines an outer perimeter <NUM> extending between the inlet and outlet flow faces <NUM>, <NUM>. In the example shown, the media pack <NUM> is formed from a coiled media construction, for example a media construction having a fluted (typically corrugated) media sheet and a facing media sheet that together define parallel flutes to form a fluted or z-filter media construction. Suitable media constructions for the media pack <NUM> are discussed in more detail in the Media Types and Configurations section.

In one aspect, the shell <NUM> of the filter cartridge <NUM> is formed from a polymeric material, such as nylon, polypropylene, or ABS plastic. The shell <NUM> is shown in isolation at <FIG>. In one aspect, the shell <NUM> defines a perimeter wall <NUM> that surrounds the outer perimeter <NUM> of the media pack <NUM>. A grid structure <NUM> is also shown as being provided with the shell <NUM> for supporting the outlet flow face <NUM> of the media pack <NUM>. The shell <NUM> may be secured to the media pack <NUM> by an adhesive. The perimeter wall <NUM> may surround the entirety of the media pack outer perimeter <NUM>, as shown, or surround a portion of the media pack outer perimeter <NUM>. As noted previously, the access cover <NUM> and handle <NUM> are integrally formed with the shell. As shown, the access cover <NUM> includes a main body 125a that is sized and shaped to mate against and cover the access opening 22f of the housing body <NUM>. The main body 125a defines a sealing surface 125b against which a seal associated with the housing body <NUM> can form a seal. In the example shown, the handle <NUM> is formed with the access cover <NUM> such that an open space 127a exists between the handle <NUM> and the cover <NUM> to allow an operator to grasp the handle <NUM>. The open space 127a can be defined as a recess beneath one or both sides of the handle <NUM> or can be a completely open space, as shown in the drawings. In the example shown, the access cover <NUM> can be provided with indicia 125c, such as text and directional arrows, to provide an indication to an operator as to the proper installation orientation of the filter cartridge <NUM>.

In one aspect, first and second seal support flanges <NUM>, <NUM> extend orthogonally from the perimeter wall <NUM>. The seal support flanges <NUM>, <NUM> respectively provide a support surface for the seal members <NUM>, <NUM>. The seal support flanges <NUM>, <NUM>, and thus the supported seal members <NUM>, <NUM>, are respectively provided with profiles complementary to the sealing outlet assembly sealing surface 46d and the inlet assembly sealing surface 56d. Accordingly, the seal support flange <NUM> defines a support surface 124a having a first portion 124b disposed at angle a4 and an adjoining second portion 124c, wherein the first and second portions 124b, 124c form the angle a4 between them. The shape of the support flange <NUM> imparts similar features onto the seal member <NUM> such that a seal surface 130a of the seal member <NUM> has a first portion 130b at the angle a3 and an adjoining second portion 130c at the angle a4 with respect to the first portion 130b. In the example shown, the media pack inlet flow face <NUM> is shown as being orthogonal to the longitudinal axis X1 of the filter cartridge <NUM>. Accordingly, the support flange first portion 124a and the seal first portion 130b can be said to form an angle a5 with the plane P1 defining the inlet flow face that is equal to the angle a3 minus <NUM> degrees. As such, the angle a5 in the example shown is <NUM> degrees.

The seal support flange <NUM> defines a support surface 126a having a first portion 126b disposed at the angle a1 and an adjoining second portion 124c disposed at the angle a2 with respect to the first portion 126b. The shape of the support flange <NUM> imparts similar features onto the seal member <NUM> such that a seal surface 132a of the seal member <NUM> has a first portion 132b at the angle a1 and an adjoining second portion 132c at the angle a2 with respect to the first portion 132b. In the example shown, the media pack outlet flow face <NUM> is shown as being orthogonal to the longitudinal axis X1 of the filter cartridge <NUM>. Accordingly, the support flange first portion 126a and the seal first portion 132b can be said to form an angle a6 with the plane P2 defining the inlet flow face that is equal to the angle a1 minus <NUM> degrees. As such, the angle a6 in the example shown is <NUM> degrees. In one aspect, the seal surfaces 130a, 132a can be characterized as defining axial seal surfaces or axially facing seal surfaces as the face of the seal surface is more orthogonal than not to the longitudinal axis X1 (i.e. more parallel than not to the end faces of the media pack <NUM> or facing in the same general direction as the media pack end) of the filter cartridge <NUM>.

The seal members <NUM>, <NUM> can be provided with various features to enhance sealing. The seal members <NUM>, <NUM> are shown in isolation at <FIG>, respectively. With reference to <FIG> a cross-sectional view of the seal members <NUM>, <NUM> is presented. In one aspect, the seal members <NUM>, <NUM> are injection molded seals. As presented, the seal members <NUM>, <NUM> include a base member 133a and a pair of seal lips or extensions 133b, 133c that together form a c-channel type shape. The base member 133a and the side 133d of the lip extension 133b interfaces with the seal support flanges <NUM>, <NUM> and can be secured to the flanges <NUM>, <NUM> via an adhesive. The seal members <NUM>, <NUM> can also include a top segment 133e wherein the c-shaped channel is oriented <NUM> degrees to the remainder of the seal member <NUM>, <NUM>. At top segment 133e, the open side of the channel faces in the same direction as the lip extension 133c of the remaining segment of the seal member <NUM>, <NUM>. This configuration allows for the seal members <NUM>, <NUM> to be more easily molded onto the inlet and outlet housing assemblies <NUM>, <NUM>. At the location of the top segment 133e, the distal ends of each of the lip extensions 133b, 133c form the axial seal surface for the seal members <NUM>, <NUM>.

In one aspect, the seal surface first portions 130b, 132b form an angle with each as defined by the angles a1 and a3. As shown, this angle is about <NUM> degrees. In one aspect, the seal surface second portions 130c, 132c form an angle with each other as defined by the angles a1, a2, a3, and a4. As shown, this angle is about <NUM> degrees. Other angles are possible. In some examples, the first portions 130b, 132b are planar while in others the first portions 130b, 132b are curved. In some examples, the second portions 130c, 132c are planar while in others the second portions 130c, 132c are curved. In some examples, each of the first portions 130b, 132b and the second portions 130c, 132c are planar with a curved or radiused portion joining the first and second portions together. In some examples, the first portions 130b, 132b are planar and the second portions 130c, 132c are curved. In some examples, the first portions 130b, 132b define a majority of the length of the seal surfaces and the second portions 130c, 132c define a minority of the length of the seal surfaces.

As a result of the seal members <NUM>, <NUM> being disposed at the angles a5, a6, the seal members <NUM>, <NUM> taper towards each other in the insertion direction I1 and in a direction away from the cover <NUM> such that the seal members <NUM>, <NUM> are closer to each other at a location remote from the cover <NUM> as compared to a location proximate the cover <NUM> (i.e. distance between seal members <NUM>, <NUM> increases in a direction towards the cover). This tapered configuration allows for easier installation of the filter cartridge <NUM> into the interior region 20i of the housing body <NUM> with less compressive resistance from the seal members <NUM>, <NUM>, as compared to a configuration where the seal members <NUM>, <NUM> oriented entirely parallel to each other and the plane P without any tapering. This advantage is even further achieved by the additional increased tapering angle presented by the second portions 130c, 132c which deviates outside of the plane defined by the first portions 130b, 132b (i.e. distance between seals at second portions 130c, 132c increases at a greater rate than distance between seals at first portions 130b, 132b in direction towards cover). These features allow for the filter cartridge <NUM> to simultaneously have axial seals while being transversely or side-loaded in the insertion direction I1, wherein the seals <NUM>, <NUM> form a seal with the housing <NUM> without further requiring any movement of the filter cartridge <NUM> within the housing body <NUM> along the axis X1 in order to form a seal with the housing <NUM>.

Another advantage of the disclosed configuration is that the filter cartridge seals against the inlet and outlet housing assemblies <NUM>, <NUM> rather than the housing body <NUM>. Because the seal member <NUM> forms a seal against the seal surface 56d of the inlet housing assembly <NUM> and the seal member <NUM> forms a seal against the seal surface 46d of the outlet housing assembly <NUM>, it is not necessary for the cover <NUM> to form a leak-proof seal with the housing body <NUM> or for the filter cartridge <NUM> to form a leak-proof seal with the housing body <NUM>.

In one aspect, the filter cartridge <NUM> is also shown as being provided with lock interface features <NUM> at each end. The lock interface features <NUM> interact with the locking mechanisms <NUM> such that the filter cartridge <NUM> can be locked in place with respect to the housing <NUM>. As shown, the lock interface features <NUM> include an arcuate rib structure <NUM> and a pair of tab structures <NUM>, each of which is integrally formed on the access cover <NUM>. The structure and function of these features are further described in the lock mechanism section.

Referring to <FIG>, the exemplary air cleaner assembly <NUM> includes an optional secondary or safety filter cartridge <NUM>. The safety filter cartridge <NUM> is shown in isolation at <FIG>. The safety filter <NUM> is generally positionable between the main filter cartridge <NUM> and the outlet 48b of the housing <NUM>. In a typical arrangement, the safely filter <NUM> is removably positioned within the air cleaner assembly <NUM> and would also typically be considered to be a service component that is removable and replaceable, as desired and/or necessary.

The exemplary embodiment of safety filter <NUM> includes an outer frame <NUM> that carries a seal member <NUM> having a pair of parallel lip seals, and generally matches the size and shape of the inner area of the housing outlet body <NUM> (e.g. straight segmented portions 42d together with the straight sides of the interior surface of the sidewall 42a) and can seal to the outlet body <NUM>, preferably with no gaps. In this way, the safety filter <NUM> can be pressed into the housing with a friction fit against the wall of the housing so that no air can reach the outlet without first going through the safety filter. The safety filter <NUM> can also include filtration media <NUM>, such as pleated media. A handle <NUM> may also be provided to aid in installing and removing the filter cartridge <NUM> from the housing <NUM> via the access opening 22f.

Any type of filter media can be used as the media pack for the filter cartridges <NUM>, <NUM> in accordance with embodiments of the invention. For example, woven and non-woven materials using natural and/or synthetic fibers can be used to form fluted filter media, pleated media, and depth media. An exemplary configuration includes fluted filter media, such as a z-filter construction. The term "z- filter construction" as used herein, is meant to refer to a type of filter construction in which individual ones of corrugated, folded or otherwise formed filter flutes are used to define sets of longitudinal, typically parallel, inlet and outlet filter flutes for fluid flow through the media; the fluid flowing along the length of the flutes between opposite inlet and outlet flow ends (or flow faces) of the media. Some examples of filter media are provided in <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; <CIT>; and <CIT>.

One type of z-filter media utilizes two specific media components joined together to form the media construction. The two components include a fluted (typically corrugated) media sheet and a facing media sheet. The facing media sheet is typically non-corrugated, although it is possible for it to also be corrugated (e.g., perpendicular to the flute direction) as described in <CIT>, and published as <CIT>.

The fluted media sheet and the facing media sheet are used together to define media having parallel inlet and outlet flutes. In some instances, the fluted sheet and facing sheet are secured together and are then coiled as a media strip to form a z-filter media construction. Such arrangements are described, for example, in <CIT> and <CIT>.

In certain other arrangements, some non-coiled sections or strips of fluted (typically corrugated) media secured to facing media, are stacked with one another, to create a filter construction.

Corrugated media is a specific form of fluted media, wherein fluted media has individual flutes or ridges (for example formed by corrugating or folding) extending thereacross. The term "corrugated" is used herein to refer to structure in media, such as media having a flute structure resulting from passing the media between two corrugation rollers (e.g., into a nip or bite between two rollers, each of which has surface features appropriate to cause corrugations in the resulting media).

Serviceable filter element or filter cartridge configurations utilizing z-filter media are sometimes referred to as "straight through flow configurations" or by variants thereof. In general, serviceable filter elements or cartridges have an inlet flow end (or face) and an opposite exit flow end (or face), with flow entering and exiting the filter cartridge in generally the same straight through direction. The term "serviceable" in this context is meant to refer to a media containing filter cartridge that is periodically removed and replaced from a corresponding fluid (e.g. air) cleaner.

Referring to <FIG>, it can be seen that the connectors <NUM>, hereafter referred to as lock mechanisms <NUM>, are provided at each end of the filter cartridge <NUM>. As described previously, the filter cartridge <NUM> includes features <NUM> including arcuate ribs <NUM> and tab structures <NUM> that are integrally formed with the access cover <NUM> of the shell <NUM>. Each of the tabs <NUM> is received in a corresponding recess 92a of an operator part <NUM> of the lock mechanism <NUM>. The filter cartridge <NUM> cannot be fully inserted into the housing <NUM> unless the lock mechanisms <NUM> are rotated into a fully unlocked position such that the recesses 92a align with the tabs <NUM>.

Referring to <FIG>, the operator part <NUM> is shown in further detail. As shown, the operator part <NUM> includes the aforementioned recess 92a, a pair of handle portions 92b for enabling a user to grasp and rotate the operator part <NUM>, a cover portion 92c, a stem portion 92d extending from the cover portion 92c, a retaining groove 92e defined within the stem portion 92d, an arc-shaped rib portion 92f defining a groove or channel <NUM> between the rib portion 92f and a sidewall portion <NUM> of the cover portion 92c, a pair of recessed areas 92i at the location where the rib portion 92f meets the sidewall portion <NUM>, and a central indexing member 92j extending between the rib portion 92f and the sidewall portion <NUM>. The sidewall portion <NUM> is also shown as including lead in or ramped portions <NUM> at the ends of the of the sidewall portion <NUM> to better allow the cover portion 92c to be rotated over the filter cartridge access cover <NUM>.

Referring to <FIG>, a base part <NUM> of the lock mechanism <NUM> is shown in further detail. As shown, the base part <NUM> includes a main body 94a within which a central aperture 94b is defined, a lock spring retaining feature 94c including a pair of apertures 94f a pair of apertures <NUM> and a central tab <NUM>, a pair of arc-shaped rib portions 94d, and a pair of attachment features 94e for securing the lock mechanism <NUM> to the housing <NUM>. In one aspect, the attachment features 94e include a pair of L-shaped channels 94e that receive the correspondingly shaped L-shaped rib members 24d, 26d on the housing body <NUM>.

Referring to <FIG>, a lock spring <NUM> of the lock mechanism <NUM> is shown in further detail. As shown, the lock spring <NUM> extends from a base portion 96a to ramped portions 96b which in turn extends to tab portions 96c. The lock spring <NUM> further includes a latch portion 96d projecting from the tab portion 96c. The latch portion 96d includes a latch face 96e for engaging against an edge <NUM> of the cover portion <NUM>. The lock spring <NUM> is also shown as being formed with tabs 96e and 96f for securing the lock spring <NUM> to the lock spring retaining feature 94c of the base part <NUM>. In the example shown, the lock spring <NUM> is cut from a steel sheet (e.g. spring steel) and bent to shape.

Referring to <FIG>, a retaining ring <NUM> of the lock mechanism <NUM> is shown in further detail. The retaining ring <NUM> includes a main body 98a within which a central aperture 98b is defined. In the example shown, the retaining ring <NUM> is formed from a metal material, such as spring steel.

In one aspect, the lock spring base portion 94a is received within the lock spring retaining feature 94c such the tabs 96e extend through openings 94f and <NUM> and the tab 96f is retained by the central tab <NUM> of the base part 94and such that the ramped portions 96b extend away from the base part main body 94a. <FIG> shows the lock spring <NUM> attached to the base portion <NUM> with the cover <NUM> removed to better show the connection between the lock spring <NUM> and the base portion <NUM>. This configuration allows the lock spring tab portion 96c to be deflectable from a relaxed or resting position (i.e. the raised position in the drawings), as shown at position P1 in <FIG> and <FIG>, to a deflected position (i.e. the lowered position in the drawings)towards the main body 94a, as shown at position P2 in <FIG>. The operator part <NUM> is mounted to the base part <NUM> by passing the stem portion 92d of the operator part <NUM> through the central aperture 94b of the base part <NUM> such that the operator part cover portion 92c covers the base part main body 94a. In this position, the ribbed portion 94d of the base part <NUM> rests in a groove formed between the operator part ribbed and outer wall <NUM>. The two parts are secured together by installing the retaining ring <NUM> onto the retaining groove 92e.

Once the operator and base parts <NUM>, <NUM> are secured together, the operator part <NUM> is rotatable with respect to the base part <NUM> from an unlocked position to a locked position. In the unlocked position, the operator part <NUM> is aligned such that the tab portion 96c extends into the recess 92a in the cover portion 92c of the operator part <NUM> and such that the latch face 96f of the locking spring <NUM> rests against the side edge <NUM> of the operator part <NUM>. Due to the interaction between the latch face 96f and the operator part side edge <NUM>, the operator part <NUM> is unable to be rotated out of the unlocked position with the locking spring <NUM> in the resting position. In the event that that the operator part <NUM> is rotated past this position without a filter cartridge <NUM> installed, the operator part <NUM> can be easily rotated back to the unlocked position as the ramped face 96e will allow the locking spring latch portion 96d to easily deflect and slide past the side edge 92f on the operator part <NUM>.

When the filter cartridge <NUM> is installed into the housing <NUM>, the tabs <NUM> on the access cover <NUM> contact and deflect the locking spring <NUM> of each of the lock mechanisms <NUM> in a direction towards the base part <NUM>. This interaction is shown in the schematic presented at <FIG> as position P2. Once the filter cartridge <NUM> is fully installed, each latch portion 96d is displaced beyond the side edge 92f thereby allowing the operator part <NUM> to be rotated towards the locked position in either a clockwise or counterclockwise direction. As the operator part <NUM> is rotated towards the locked position, the ribbed portion 92f on the operator part <NUM> slides along the ribbed structure <NUM> of the filter cartridge <NUM>. Thus, the ribbed structure <NUM>, which can be characterized as a connection member, works in conjunction with the operator part <NUM> to secure the media pack within the air cleaner housing. As the filter cartridge <NUM> is a true side-loaded filter cartridge which does not need to be axially displaced after insertion into the housing <NUM> to effectuate a seal, the filter cartridge <NUM> is configured such that at least a portion of the ribbed structure <NUM> extends axially beyond the inlet/outlet flow end of the media pack <NUM>. In the particular example shown, the entirety of the ribbed structure <NUM> is axially beyond the inlet/outlet flow end of the media pack <NUM>.

In the example shown, the locking mechanisms <NUM> do not directly effectuate a seal at seal members <NUM>, <NUM> in the direction of the longitudinal axis X. Instead, the seal is formed by an interference fit between the individual seals members <NUM>, <NUM> and the individual sealing surfaces 46d, 56d. The lock mechanisms <NUM> can be configured to exert a compressive force onto the filter cartridge <NUM> and thus the seal members <NUM>, <NUM> in the insertion direction. The locking mechanisms <NUM> do operate to lock the filter cartridge <NUM> in place in self centering fashion wherein stress is transferred between the lock mechanisms <NUM> and cover <NUM> but without imparting a force onto the seal members <NUM>, <NUM>. Thus, even in a configuration where only one of the seal members <NUM>, <NUM> is provided, the lock mechanisms <NUM> will still function to axially align and fix the filter cartridge <NUM> to effectuate a single seal without the need for the presence of the second seal or any other component on the cartridge or housing to effectuate the seal.

Additionally, the retaining ring <NUM> is configured such to exert a spring force onto the operator part <NUM>. The operator part <NUM> is rotated into the locking position until the rib 92j of the operator part engages with a stop member or detent 152i on the arcuate shaped rib structure <NUM> on the filter cartridge <NUM> to aid in retaining the operator part <NUM> in the locked position and to provide an installer with tactile feedback of the locked position. During initial rotation of the operator part <NUM>, the rib 92j rides on to of or against the rib structure <NUM> on the filter cartridge <NUM> which provides slight resistance to rotation. Once the rib 92i reaches the stop member 152i, the rib 92i snaps into the recess defined by the stop member 152i, thus simultaneously indexing the operator part <NUM> into the locked position and providing tactile feedback. To remove the filter cartridge <NUM> from the housing, the operator simply rotates each operator part <NUM> until the recesses 92a align with the tabs <NUM>.

As can be appreciated by the above description, the complementary configuration of the locking mechanisms <NUM> and filter cartridge tabs <NUM> ensures that the correct filter cartridge is installed into a housing that is actually designed to receive the filter cartridge. If an attempt is made to install a filter cartridge that does not include the tabs <NUM>, the filter cartridge <NUM> will fail to enable the lock mechanisms to move to the locked position, thus alerting the installer that an incorrect filter cartridge is installed. Although the tabs and recesses are shown as having a particular shape, other shapes are possible. Different shapes may be used for different air cleaner sizes or designs, thus ensuring the correct filter cartridges are installed appropriate housings throughout an entire product line.

Referring to <FIG>, details of the mounting arrangement <NUM> are shown in greater detail. The mounting arrangement <NUM> is shown as being installed on the main housing body <NUM> at <FIG> and <FIG>. As shown, the mounting arrangement <NUM> is shown as including a pair of mounting structures <NUM> that are mounted to the housing body <NUM> in a spaced apart and parallel arrangement. The mounting arrangement <NUM> is also shown as including four mounting clips <NUM>. Either of the mounting clips <NUM> or the mounting structures <NUM> can be independently used to mount the air cleaner <NUM> to a supporting structure with the mounting clips <NUM> providing a fixed-distance mounting arrangement and the mounting structures providing an adjustable mounting system. Where both mounting structures <NUM> and mounting clips <NUM> are provided, an installer or designer can utilize whichever mounting approach best suits a particular application. As the mounting structures <NUM> and mounting clips <NUM> can be independently used to mount the air cleaner <NUM> to a supporting structure, an air cleaner <NUM> can be provided with only the mounting structures <NUM> or only the mounting clips <NUM>.

As can be seen at <FIG> and <FIG>, the housing body <NUM> defines a pair of channels <NUM> defined by sidewalls 25a which receive the mounting structures <NUM>. The housing body <NUM> is also provided with end walls 25b extending across the sidewalls 25a at each end. The end walls 25b are shown as including apertures 25c such that the end walls can receive mounting clips <NUM>. The mounting clips <NUM> form a portion of the mounting arrangement. The housing body <NUM> is also shown as including apertures 25d for receiving a portion of the mounting structures <NUM> such that the mounting structures <NUM> can be secured to the housing body <NUM>.

With reference to <FIG>, features of the mounting structures <NUM> are shown in greater detail. In one aspect, each mounting structure <NUM> includes a first channel part 32a that receives a second channel part 32b. As can be most easily seen at <FIG>, the second channel part 32b has a width or dimension that matches the head 32d of a bolt 32c that allows the bolt to slide along the length of the second channel part 32b but prevents the bolt from rotating. The first channel part 32a has a central opening 32e through which the head 32d can pass such that the head can be received by the second channel part 32b. The first channel part 32a additionally has lateral walls 32f that extend towards each other to secure the opposite side of the bolt head 32d. Thus, a bolt 32c can be received into the first channel part 32a and then into the second channel part 32b such that the bolt 32c is slidably secured between the second channel part 32b and the walls 32f. With such a configuration, the position of the bolts 32c can be easily adjusted to align with a given mounting structure. The bolts 32c are prevented from sliding off either end of the channel parts 32a, 32b by the end walls 25b on the housing body <NUM>.

The second channel part 32b is shown as including an extension part <NUM> at one end that is received by the housing body slots 25d and an extension part <NUM> at the other end that can engage with or interact with the mounting clip <NUM>. The mounting structure <NUM> can also be provided with a spacer, fill, or interfence member <NUM> (e.g. collapsed polymeric tube or moon-shaped polymeric tube) that can be received by the first and second channel parts 32a, 32b that can aid in holding the bolts 32c in a fixed position and dampen potential vibration. In one aspect, the first channel part 32a can be provided with apertures 32f that receive tabs <NUM> of the second channel part 32b to aid in securing the first and second channel parts 32a, 32b together.

Referring to <FIG>, the retaining clip <NUM> is shown in greater detail. In one aspect, the retaining clip <NUM> includes a base portion 34a, a head portion 34b extending from the base portion 34a, and a clip portion 34c extending from the base portion 34a. The head portion 34b includes an aperture 34d, which can be a threaded opening for receiving a mounting bolt. The mounting clip <NUM> is installed onto the end wall 25b such that the head portion 34b extends through the aperture 25c and such that the end wall 25b is clipped between the base portion 34a and the clip portion 34c. The retaining clip <NUM> is further provided with a snap member 34e that snaps into the recess 25c when the clip <NUM> is installed such that the clip <NUM> is retained onto the end wall 25b via a snap-fit type connection. The clip member <NUM> can also be provided with protrusions 34f that can snap into recesses formed in the housing body <NUM> to further secure the clip member <NUM>.

Referring to <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, it can be seen that the air cleaner <NUM> is provided with a positioning arrangement <NUM> disposed within a well area <NUM> of the housing body <NUM>. In one aspect, the well area <NUM> is defined by a pair of sidewall portions 27a and a sidewall portion 27b. The portions 27a, 27b are a part of the housing body sidewall 22a. The positioning arrangement <NUM> is designed to ensure that a proper filter cartridge <NUM> is installed into the air cleaner <NUM>. In one aspect, the positioning arrangement creates an internal profile within the housing body <NUM> that requires the filter cartridge <NUM> to have a matching and complementarily shaped profile in order to be received fully into the housing body <NUM>. In the embodiment shown, the positioning arrangement <NUM> is formed by a pair of arrays with spaced apart ribs 29b extending from the housing body sidewall 22a to pin extensions 29a. In the example shown, five pins 29a and ribs 29b are shown on each side of the housing body interior region 20i. The pins 29a and ribs 29b are each configured to receive and retain an insert module <NUM>. In the embodiment shown, three insert modules <NUM> are mounted onto the pins 29a and ribs 29b on each side of the housing body <NUM>. As should be appreciated, the positioning arrangement <NUM> is modular in nature and thus can be customized to achieve a number of different internal profiles to fit a particular application. For example, one, two, four, or all five insert modules <NUM> could be installed on each side. Where less than five insert modules <NUM> are utilized, the spacing between the insert modules <NUM> can likewise be customized (e.g. spaced on every other pin 29a, etc.). Also, the number and arrangement of the insert modules <NUM> can be different from one side of the housing body <NUM> to the other. Once the desired number and arrangement of insert modules <NUM> is selected, the filter cartridge <NUM> can then be designed such that no part of the filter cartridge interferes with the insert modules <NUM>. An asymmetrical arrangement (side-to-side or front-to-back) can be selected such that it is impossible to inadvertently insert the filter cartridge <NUM> in the reverse direction, thus ensuring that even a properly selected filter is properly installed.

With reference to <FIG>, an example filter cartridge <NUM> profile portion or extension 100a is shown in which portions of the filter cartridge profile 100a extend between the open spaces defined between the insert modules <NUM> and in which no portion of the filter cartridge profile 100a extends into a space occupied by an insert module <NUM>. Thus, it is illustrated that a filter cartridge <NUM> must have a profile generally corresponding to profile 100a in order to be fully received within the interior region 20i of the housing body <NUM> in the proper orientation. In the embodiment shown, the profile extension 100a is a protrusion integrally formed with the filter cartridge shell <NUM>.

Claim 1:
An air cleaner assembly (<NUM>) comprising:
a) a housing (<NUM>) defining an inlet (<NUM>) and an outlet (<NUM>), and including an access opening (22f) between the inlet (<NUM>) and outlet (<NUM>);
b) a filter cartridge (<NUM>) received within the housing (<NUM>), the filter cartridge (<NUM>) covering the access opening (22f); and
c) a lock mechanism (<NUM>), the lock mechanism (<NUM>) being movable between an unlocked position in which the filter cartridge (<NUM>) can be installed and removed from the housing (<NUM>) and a locked position in which the filter cartridge (<NUM>) is secured within the housing (<NUM>);
d) characterized in that the filter cartridge (<NUM>) and lock mechanism (<NUM>) include interacting features (<NUM>) enabling the lock mechanism (<NUM>) to be moved from the unlocked position to the locked position only when the filter cartridge (<NUM>) is installed within the housing (<NUM>).