AIR INDUCTION FILTER HOSE ASSEMBLY

Abstract: A filter assembly is formed of an impervious elongated tubular housing (10) and an elongated filter member (18) positioned within the housing with its opposed longitudinal edges (24, 26) sealed to the internal tubular surface (12) of the housing (10). A first barrier (36) is interposed between a first surface (20) of the filter member (18) and the internal tubular surface (12) of the housing (10) adjacent the inlet end (14) of the housing, and a second barrier (38) is interposed between a second surface (22) of the filter member (18) and the internal tubular surface (12) of the housing (10) adjacent the outlet end (16) of the housing. Air flowing into the inlet end (14) of the housing (10) passes through the filter member (18) before exiting at the outlet end (16) of the housing.

Description: AIR INDUCTION FILTER HOSE ASSEMBLY Technical Field The invention relates to an air induction filter hose assembly that is particularly useful for filtering induction air for an internal combustion engine and most specifically, for use in an automobile, truck or bus application where space is limited around the engine. Disclosure of the Invention The invention is a filter assembly in the form of an elongated impervious tubular housing that is preferably in the form of a semi¬ rigid elastomeric hose. The hose may be of various cross-sectional arrangements but preferably is circular to thereby allow maximum flexibility. An elongated filter member is positioned within the tubular housing. The filter member has opposed first and second surfaces, opposed longitudinal edges, and a first and a second end. The longitudinal opposed edges of the filter member are sealed to the internal tubular surface of the housing. The edges of the filter member may be sealed by bonding, by adhesive or the edges can be encapsulated in the elastomeric material of which the tubular housing is formed. One method of manufacturing the filter assembly is to injection mold the tubular housing around the filter member to thereby encapsulate the longitudinal edges. A first barrier is positioned within the tubular housing at the filter member first end. The first barrier is configured to sealably engage the filter member first surface and the interior tubular surface of the tubular housing that is opposed to the filter member first surface. The first barrier therefore leaves an open space at the filter member first end between the filter member second surface and the internal tubular surface of the housing. In a similar manner, a second barrier is interposed between the filter member second surface and the housing internal tubular surface adjacent the filter member second end. Induction air entering the housing inlet end must pass through the filter member before exiting at the housing outlet end. The filter member is preferably formed of a sheet of polyester non-woven filter media. Further, the filter member sheet is preferably pleated lengthwise to thereby substantially increase its cross-sectional area. The first and second barriers may be formed of impervious relatively thin plastic plates bonded at one edge to the filter media and at the opposed edge to the interior wall of the tubular housing. Another embodiment is to form the first and second barriers of filter material, such as a sheet of polyester non-woven filter media. The filter hose of this invention performs dual functions, when used as a part of a vehicle assembly having an internal combustion engine, of first conducting inlet air from a location within the vehicle to the engine intake system, and second filtering such induction air without requiring a separate air filter housing. Brief Description of the Drawings The features of the invention, and its technical advantages, can be seen from the following description of the preferred embodiments together with the claims and the accompanying schematic drawings, in which: Figure 1 is an elevational view of a filter hose assembly that incorporates the principles of this invention. The figure shows a tubular housing containing an elongated pleated filter member. The elongated edges of the filter member are affixed to the internal wall of the tubular housing. The tubular housing is shown curved, indicating that it may be semi-rigid or flexible. Figure 1 is shown broken away since the length of the filter hose assembly can vary as required. Figure 2 is an external elevational view as shown in Figure 1 but showing a first and a second barrier positioned within the interior of the tubular housing. The barriers form a flow path through the tubular housing requiring air entering the inlet end to flow through the filter member before exiting the outlet end. Figure 3 is a cross-sectional view, taken along the line 3-3 of Figure 2, showing the relationship between the tubular housing, the filter member and the outlet end barrier. Figure 4 is an elevational cross- sectional view of a straight tubular housing. By the use of arrows the flow paths through the housing are shown. Description of the Preferred Embodiments Referring to the drawings and first to Figures 1 and 2, the basic concepts of the invention are illustrated. An impervious elongated tubular housing 10 has an internal tubular surface 12, an inlet end 14 and an outlet end 16. The tubular housing 10 may have a variety of cross-sectional configurations, such as square, elliptical, and so forth, however, a circular configuration as illustrated in Figures 1 and 2, except for special applications, is the preferred embodiment. By use of a circular cross-sectional configuration, the tubular housing 10 can be made to be equally flexible in any direction, thus more readily adapting the air induction filter hose assembly to a variety of spatial applications. The tubular housing 10 is preferably formed of an elastomeric material. While the housing 10 may be rigid or substantially rigid, the preferred embodiment is that housing 10 be semi-rigid, that is, the housing should have sufficient structural rigidity to substantially maintain its cross-sectional configuration but, at the same time, permit the housing to be bent or curved at least slightly along its longitudinal tubular axis so as to accommodate space requirements commonly encountered when the filter hose assembly is used to filter induction air for an internal combustion engine. Positioned within the tubular housing 10 is an elongated filter member 18. The filter member 18 has a first surface 20, an opposed second surface 22, opposed longitudinal edges 24 and 26 (best seen in Figure 3) , a first end 28 and a second end 30. The length of the filter member 18 is not greater than the length of the tubular housing 10 and is illustrated as being somewhat shorter than that of the tubular housing 10. The first end 28 of the filter member 18 is adjacent the tubular housing inlet end 14, and the second end 30 is adjacent the tubular housing outlet end 16. The longitudinal edges 24 and 26 are secured to the tubular surface 12 of the tubular housing 10. This can be accomplished such as by bonding with an adhesive or the tubular housing may be injection molded around the filter member 18 so that the filter member edges 24 and 26 are encompassed within the tubular housing as illustrated in Figure 3. Any mechanism by which the longitudinal edges of the filter member 18 are permanently secured to the interior wall is within the scope of this invention. The filter member 18 divides the interior of the tubular housing 10 into a first space 32 that exists between the filter member first surface 20 and the interior tubular surface 12 and, in like manner, a second space 34 that extends between the filter member second surface 22 and the interior tubular surface 12 of the housing. To define flow paths within the air induction hose assembly, a first barrier 36 is secured to the filter member second surface 22 adjacent the first end 28 and to the internal tubular surface 12 of the tubular housing 10 adjacent the first or inlet end 14 (as seen at the left end of Figure 2) . In like manner, a second barrier 38 is secured between the filter member first surface 20 and the interior tubular surface 12 of the tubular housing 10 adjacent the filter member second end 30 adjacent to the housing second or outlet end 16 (seen at the right hand end of Figure 2) . The cross-sectional configuration of the filter member 18 may vary considerably. In the preferred arrangement, the filter member 18 is formed of a flat sheet of thick, high-loft polyester non-woven filter media. This flat sheet is preferably pleated as illustrated in the figures. Pleating is commonly employed in filtration equipment to substantially increase the cross-sectional area of the filter media. It is obvious that the cross-sectional area of the filter media for a given diameter and length of tubular housing can be dramatically increased by increasing the height of the pleating as well as the number of pleats employed. The first and second barriers 36 and 38 may be formed of thin impervious material, such as sheet plastic material, or may be formed of filter media, that is, formed of sheets of polyester non¬ woven filter media that is bonded to the filter member 18 and the internal tubular surface 12 of the tubular housing 10. Figure 4 illustrates, by arrows, the path of flow through the filter from the inlet end 14 to the outlet end 16. The air induction filter hose assembly as illustrated and described herein is particularly adapted for use to provide induction air to an internal combustion engine such as for automobiles, trucks and so forth, however, the invention may be employed for purposes other than air filtration. The filter member 18 may be supported by the use of top and bottom combs (not shown) or other kinds of standoff may be employed to provide structural rigidity of the filter member as necessary. Such combs or standoffs, when used, will be constructed so as to provide minimum interference with the flow paths. The embodiment of Figure 4 shows integral reinforcing ribs 40, such as circumferential ribs, formed adjacent the housing inlet and outlet ends 14 and 16. These are illustrative of the fact that the tubular housing may be designed to receive clamps or other apparatus by which the ends of the tubular housing may be attached to other components in an automobile or truck assembly or for other applications. While not illustrated, the tubular housing, obviously, could include metallic or rigid plastic structural reinforcing components as an integral part thereof to maintain the configuration of the housing adjacent the ends for better connection to other apparatuses. The air induction filter hose assembly as herein described offers many advantages over the standard type of air filtration used in automobiles, trucks and so forth. First, by combining the filtration system with an air induction hose, two functions are concurrently achieved by the same apparatus, thus reducing space and weight requirements. Second, the filtration system employed integrally with the air induction hose means that air velocity will be maintained at a substantially consistent rate throughout the induction passageway, as compared with other filtration systems wherein an induction hose connects to a housing in which a filter element is located. As previously stated, the edges 24 and 26 of the filter member can be bonded to or encompassed within the housing interior tubular surface. Figures 1 and 2 show, on the exterior surface of the tubular housing, areas 42 opposed to the interior surface where the filter member edges are embedded. As a practical matter, depending upon the type of construction employed, exterior visual indication of the area where the filter member edges are encompassed may or may not exist . The claims and the specification describe the invention presented and the terms that are employed in the claims draw their meaning from the use of such terms in the specification. The same terms employed in the prior art may be broader in meaning than specifically employed herein. Whenever there is a question between the broader definition of such terms used in the prior art and the more specific use of the terms herein, the more specific meaning is meant. While the invention has been described with a certain degree of particularity, it is manifest that many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. It is understood that the invention is not limited to the embodiments set forth herein for purposes of exemplification, but is to be limited only by the scope of the attached claim or claims, including the full range of equivalency to which each element thereof is entitled.

Claims: CLAIMS : 1. A filter assembly comprising: an impervious elongated tubular housing (10) having an internal tubular surface (12) , an inlet end (14) , and an outlet end (16) ; an elongated filter member (18) having opposed first (20) and second (22) surfaces, opposed longitudinal edges (24, 26) , and first (28) and second (30) ends, the filter member (18) being of length not greater than said housing (10) , the filter member (18) being positioned within said housing (10) with said opposed longitudinal edges (24, 26) sealed to said internal tubular surface (12) of said housing (10) ; a first barrier (36) interposed between said first surface (20) of said filter member (18) and said internal tubular surface (12) of said housing (10) adjacent said first end (28) of said filter member (18) ; and a second barrier (38) interposed between said second surface (22) of said filter member (18) and said internal tubular surface (12) of said housing (10) adjacent said second end (30) of said filter member (18) . 2. A filter assembly comprising: an elongated hollow housing (10) having an internal circumferential surface (12) , an inlet end (14) , and an outlet end (16) ; an elongated filter member (18) having opposed first (20) and second (22) surfaces, opposed longitudinal edges (24, 26) opposed ends (28, 30) , and of length not greater than said housing (10) , the filter member (18) being positioned within said housing (10) with said longitudinal edges (24, 26) sealed to said internal circumferential surface (12) of said housing (10) , thereby providing a first (34) and a second (32) space between said first and second surfaces (20, 22) of said filter member (18) on the one hand, and said internal circumferential surface (12) of said housing (10) on the other hand; means (36) for closing said first space (34) adjacent said inlet end (14) of said housing (10) ; and means (38) for closing said second space (32) adjacent said outlet end (16) of said housing (10) . 3. A filter assembly comprising: an elongated tubular housing (10) having an internal tubular surface (12) , an inlet end (14) , and an outlet end (16) ; an elongated filter member (18) positioned within said tubular housing (10) dividing the interior thereof into first (34) and second areas (32); means (36) adjacent said inlet end (14) of said housing (10) closing said first area (34) ; and means (38) adjacent said outlet end (16 of said housing (10) closing said second area (32) , whereby fluid flowing through said housing (10) from said inlet (14) to said outlet (16) end must pass through said filter member (18) . 4. A filter assembly according to any of the claims 1-3, characterized in that said tubular housing (10) is substantially circular in cross-section. 5. A filter assembly according to any - ll ¬ Of claims 1-3, characterized in that said tubular housing (10) and said filter member (18) are flexible. 6. A filter assembly according to any of claims 1-3, characterized in that said filter member (18) is formed of an elongated sheet of filter media. 7. A filter assembly according to claim 6, characterized in that said elongated sheet of filter media (18) is pleated into a lengthwise undulating pattern. 8. A filter assembly according to any of claims 1-3, characterized by reinforcing means (40) , such as circumferential reinforcing means, on said tubular housing (10) adjacent at least one of said inlet and outlet ends (14, 16) .

Inventors: HAGGARD CLIFFORD D, HAGGARD, CLIFFORD, D.
Applicants: PUROLATOR PRODUCTS CO, PUROLATOR PRODUCTS COMPANY
Application year: 1996
Main classification: B01D46
IPC codes: B01D46, F02M35