Air cleaner replaceable filter cartridges; and, methods

1. An air cleaner assembly comprising:

(a) an air cleaner housing comprising a main housing having: a first end with an axial air flow outlet; and, a second, open, end; the main housing including:

(i) a housing main filter element sealing surface;

(ii) a housing safety filter element sealing surface; and,

(iii) a liner secured to, and extending from, the main housing first end in extension toward the second open end of the main housing; the liner having an open support structure and a remote end from the housing first end; the liner including a closed end cap having a central cone extension projecting away from the axial air flow outlet;

(b) a safety filter element separate from, and removably positioned over, the liner;

(i) the safety filter element comprising media extending between first and second ends;

(ii) a seal member positioned on the safety filter element and oriented to form a radially directed seal with the housing safety filter element sealing surface; and,

iii) an end piece positioned on the second end of the safety filter and oriented with a portion thereof surrounding a portion of the liner remote end;

(c) a main filter element removably positioned, separate from the safety filter element, in the air cleaner housing: over the safety filter element; and, over the liner; the main filter element comprising media extending between first and second ends;

(i) the first end of the media of the main air filter element having a main filter first end cap thereon with an air flow exit aperture therethrough;

(ii) a radially directed seal on the main filter first end cap releasably sealed to the housing main filter element sealing surface; and,

(iii) a second, closed, main filter end piece positioned adjacent the second end of the media of the main filter element; the second, closed, main filter end piece having a portion projecting: to a location surrounding a portion of the liner remote end; and, also to a location positioned radially between a portion of the liner remote end and an outer perimeter portion of the end piece on the second end of the safety filter; and,

(d) an access cover removably positioned over the open end of the main housing open end.

2. An air cleaner assembly according to claim 1 wherein:

(a) the seal on the first end piece of the main filter element is a radially inwardly directed seal member.

3. An air cleaner assembly according to claim 1 wherein:

(a) the seal on the safety filter element is a radially outwardly directed seal member.

4. An air cleaner assembly according to claim 1 wherein:

(a) the media of the safety filter element is pleated.

5. An air cleaner assembly according to claim 1 wherein:

(a) the media of the main filter element is conical.

6. An air cleaner assembly according to claim 1 wherein:

(a) the removable service cover positioned over the main housing open end includes a projection thereon extending to a location surrounded by a portion of the media of the main filter element and also to a location surrounding a portion of the liner remote end.

7. An air cleaner assembly according to claim 6 wherein:

(a) the end piece positioned on the second end of the safety filter element includes a portion extending radially inwardly, from the media of the safety element, to a location surrounding an aperture; and,

(b) a portion of the liner remote end projects through the aperture in the radially inwardly directed portion of the end piece on the second end of the safety filter element.

8. An air cleaner assembly according to claim 6 wherein:

(a) the second, closed, main filter end piece includes: a portion surrounding the central cone extension on the liner; a portion receiving the central cone extension on the liner projecting therein; and, a portion positioned axially aligned with a portion of the remote end of the liner that surrounds the central cone extension.

9. An air cleaner assembly according to claim 8 wherein:

(a) the liner is snap fit to a remainder of the housing.