Title of Invention

REPLACEABLE LIQUID FILTER

Abstract The invention relates to a liquid cartridge filter, particularly for the lubricating oil of an internal combustion engine, having a substantially cup-shaped housing with a concentrically disposed outlet opening for the filtered liquid and at least one inlet opening for the liquid to be filtered and a filter element sealingly disposed between the inlet opening and the outlet opening. The housing is connected to a top plate, and the top plate is connected to an end plate. The top plate encloses a displacement space which is disposed in an inlet space in the mating part, such that the inlet opening in the top plate is disposed in the region of the displacement space and/or an anti-drain valve is disposed in the region of the outlet opening, such that the anti-drain valve is disposed axially outside the effective filter element surface.
Full Text FORM 2
THE PATENT ACT 1970 (39 of 1970)
&
The Patents Rules, 2003 COMPLETE SPECIFICATION
(See Section 10, and rule 13
1. TITLE OF INVENTION
LIQUID CARTRIDGE FILTER
2. APPLICANT(S)
a) Name : MANN+HUMMEL GMBH
b) Nationality : GERMAN Company
c) Address : D-71631 LUDWIGSBURG
GERMANY
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed : -

Liquid Cartridge Filter
Description
Prior Art
The invention relates to a liquid cartridge filter, particularly for the lubricating oil of an internal combustion engine, in accordance with the preamble of claim 1.
Liquid cartridge filters known in the prior art, which are also referred to as spin-on filters, generally have a cup-shaped housing with an end plate and a top plate holding down the end plate. The liquid is fed through openings made in the end plate, which are arranged around a concentrically disposed outlet opening. A hollow cylindrical filter element is disposed between the inlet and the outlet, and the inlet and the outlet each have an anti-drain element. An anti-drain membrane is disposed on the inlet openings, and an anti-drain valve is arranged in the interior of the hollow cylindrical filter element. This prevents the filter element from running empty when the internal combustion engine is stopped.
A drawback in the known prior art is that in liquid cartridge filters which are not suspended, the liquid present above the anti-drain valve and the liquid present in the groove-shaped inlet of the cylinder head runs out as the liquid cartridge filter is mounted for servicing and thus contaminates the engine compartment and/or the environment.
It is an object of the invention to obviate the aforementioned drawbacks and provide a liquid cartridge filter which is cost-effective and simple to manufacture.
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This object is attained on the basis of the preamble of the independent claim, by the characterizing features of the claim.
Advantages of the Invention
The invention relates to a liquid cartridge filter, particularly for the lubricating oil of an internal combustion engine, which has a substantially cup-shaped housing with a concentrically disposed outlet opening for the filtered liquid and at least one inlet opening for the liquid to be filtered. A preferably hollow cylindrical, zigzag-shaped pleated filter element is sealingly disposed between the inlet opening and the outlet opening. The housing is finally closed with a top plate, and the top plate is at the same time connected to an end plate. The housing and the top plate are preferably interconnected via a flanged edge in the outer region of the top plate, and the end plate is likewise connected by a form-fitting connection method to the top plate. Furthermore, the top plate preferably encloses a displacement space disposed in an inlet space in the mating part. This inlet space in the mating part is, for example, the circumferential inlet groove within the cylinder head. The enclosure of the displacement space by the top plate substantially follows the contour of the inlet space, such that when the liquid cartridge filter and the mating part are assembled, the displacement space is disposed within the mating part. The inlet opening to the liquid cartridge filter is thus also disposed in the region of the mating part that is enclosed by a portion of the top plate. Preferably, a plurality of inlet openings is disposed circumferentially in the displacement space. As an alternative or in addition, an anti-drain valve is disposed in the region of the outlet opening, such that the anti-drain valve is positioned axially outside the effective filter element surface. The anti-drain valve is preferably disposed as far as possible at the end of the outlet opening. Realizing the displacement space and/or the anti-drain valve in the region of the outlet opening has the
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advantage that when the liquid cartridge filter is replaced, the liquid remains in the cartridge filter and is not released to the environment.
According to one advantageous embodiment of the invention, the anti-drain valve has spring means to create a press fit on a sealing face, such that the spring means is compression loaded. Thus, the spring means applies a pressure force to a valve disk, which is thereby pressed against a sealing face to create a sealing connection. The spring means may, for example, be a helical spring or a compressible medium which applies a pressure force as it is decompressed.
As an alternative, the spring means to create a press fit on the sealing face may also be tension loaded. In this case, the spring means engages with a predefined contour within the liquid cartridge filter and pulls a valve disk onto a sealing face to create the tight press fit. The spring means may, for example, be again a helical spring or a medium subject to a negative pressure, which tends to contract. In both cases, the valve characteristic may be adjusted through the selection of the spring means, such that the anti-drain valve can be adjusted for opening or closing as a function of the pressure conditions.
It is advantageous to dispose an anti-drain membrane in the region of the displacement space. The anti-drain membrane •prevents the liquid from flowing out of the liquid cartridge filter when the cartridge filter is removed. The anti-drain membrane is preferably made of a plastic or rubber and seals the liquid inlet when the internal combustion engine is stopped. When the internal combustion engine is running, the anti-drain membrane, because of its elasticity, unblocks the liquid inlet as a result of the oil pressure prevailing at the inlet.
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The anti-drain membrane is preferably non-releasably connected to the top plate. This connection may be realized, for example, through bonding or welding.
According to another embodiment of the invention, the top plate has a sealing means at its outer axial end to seal the connection between the liquid cartridge filter and the mating part, particularly a cylinder head. Preferably, a circumferential groove is disposed in the top plate, which receives, for example, an O-ring or a cut square gasket to axially seal the connection.
According to yet another advantageous embodiment of the invention, a means for releasably coupling the liquid cartridge filter to a mating part is disposed in the region of the cover plate. The coupling means extends axially beyond the contour of the liquid cartridge filter. Thus, the connecting piece between the liquid cartridge filter and the mating part is transferred from the liquid cartridge filter into the mating part. A threaded nipple, which is necessary in the prior art to connect a standard liquid cartridge filter to the cylinder head, becomes superfluous as a result, so that, on the one hand, a costly threaded nipple may be eliminated and, on the other hand, the outlet diameter can be enlarged by the portion otherwise taken up by the threaded nipple.
It is advantageous if the releasable coupling means is a concentric annular collar with an external thread. The concentric annular collar with the external thread is thus screwed directly into the mating part, here into the cylinder head, for example. In combination with the aforementioned anti-drain valve, which is now disposed in the concentric annular collar, the resulting additional significant advantage is that a large amount of liquid is retained in the liquid cartridge filter by the anti-drain valve, which in the prior art systems would run out when the cartridge is replaced.
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According to yet another embodiment of the invention, the releasable coupling means is integrally formed from the end plate. The end plate, which is preferably made of metal and preferably produced by deep drawing, has at least one opening, which communicates with the at least one inlet opening. This opening may be the inlet opening itself or, if the displacement space is disposed in the top plate, the liquid flows through the inlet opening in the top plate and then through the opening in the end plate into the interior of the liquid cartridge filter.
As an alternative, the releasable coupling means may be releasably or non-releasably connected to the end plate so as to form a seal. The connection may be realized, inter alia, by bonding, welding or by a firm screwed connection. Here, too, the end plate furthermore has at least one opening, which communicates with the at least one inlet opening.
These and other features of preferred further refinements of the invention are set forth in the claims as well as in the description and the drawings. The individual features may be implemented either alone or in combination in the embodiment of the invention or in other fields of application and may represent advantageous embodiments that are protectable per se, for which protection is hereby claimed.
Brief Description of the Drawing
Further details will now be described, by way of example, with reference to schematic embodiments depicted in the drawing, in which:
FIG 1 is a half section of the liquid replacement cartridge according to the invention, and
FIG 2-10 illustrate embodiments of the region of the liquid cartridge filter of FIG 1 identified by the letter Z.
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Detailed Description of the Preferred Embodiments
FIG 1 shows a liquid cartridge filter 10, which is flanged to a cylinder head 11. The liquid cartridge filter 10 has a cup-shaped housing 12 which is preferably made of metal but may also be made of plastic. In the region of the coupling between the cylinder head 11 and the liquid cartridge filter 10, the liquid cartridge filter 10 has a cover plate 13, which is held in place by a top plate 14. The cup-shaped housing 12 is connected to the top plate 14 via a flanged edge, and the cover plate 13 is connected to the top plate 14 by some type of clinching. To seal the connection between the liquid cartridge filter 10 and the cylinder head 11, a square gasket 15 is placed into a groove formed in the top plate 14. This square gasket 15 axially seals the liquid cartridge filter 10 relative to the cylinder head 11. The liquid cartridge filter 10 further has an inlet opening 16 and an outlet opening 17, which are sealingly separated from one another by a filter element 18. The filter element 18 is preferably a hollow cylindrical zigzag-type pleated filter element and has a lower end disk 19 and an upper end disk 20. The lower end disk 19 has an integrated pressure regulated valve 21. If the filter element 18 is blocked or clogged, the pressure regulated valve serves to bypass the filter element 18 and provide a direct passage from the unfiltered side to the filtered side. This is a simple way to prevent damage to the internal combustion engine. In the interior of the filter element 18 is disposed a support tube 22 with openings 23 to stabilize the filter medium against pressure pulsation. The cover plate 13 and the top plate 14 furthermore include a volume contour 35, preferably made of metal, which comprises the inlet opening 16 on the one hand and extends into the cylinder head 11 on the other. This creates a displacement space 24. The liquid to be filtered, particularly the lubricating oil of the internal combustion engine, flows through an opening (not depicted) from the cylinder head 11 and then flows through the inlet opening 16 into the displacement space 24 and from
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there via a passage 25 into the unfiltered space of the liquid cartridge filter 10. In the displacement space 24, an anti-drain membrane 26 is mounted via a holder 33. The anti-drain membrane 26 is preferably made of a flexible, elastic plastic or rubber material and closes the opening 16 when the internal combustion engine is stopped. Concentrically inside the liquid cartridge filter 10, in the region of the connection between the liquid cartridge filter 10 and the cylinder head 11, is disposed a coupling collar 27. This coupling collar is firmly connected to the cover plate 13 and the volume contour 35 and in the region protruding beyond the liquid cartridge filter 10 has an external thread to create a threaded connection 34 with the cylinder head 11. In the interior of the coupling collar 27, in the region of the connection to the cylinder head 11, an anti-drain valve 28 is disposed. The anti-drain valve 28 has a valve seat 29, a compression spring 30 held by mounts 31 acting as counterbearings and a valve disk 32, such that the valve disk 32 is pushed against the valve seat 29 by the force of the compression spring 30 to create a tight connection when the internal combustion engine is stopped. The anti-drain valve 28 is integrated directly into the outlet opening 17 of the liquid cartridge filter 10 and is likewise intended to prevent the filter from running empty when the internal combustion engine is stopped. Disposing the anti-drain valve 28 in the outlet opening 17 and the anti-drain membrane 26 within the displacement space 24 has the advantage that if an upright liquid cartridge filter 10 is used no oil can flow out of the liquid cartridge filter when it is serviced and removed, such that contamination of the surroundings and the environment is avoided.
FIG 2 shows an enlargement of the region identified as Z in FIG 1. Here, it is easier to see how the compression spring 30 is held by the mounts 31 formed by the coupling collar 27 and acting as counterbearings and in turn presses the valve disk 32 against the valve seat 29.
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FIG 3 to 10 show additional embodiments in region Z of FIG 1. Like elements are provided with the same reference numbers.
FIG 3 shows a variant in which the inlet opening 16 is not disposed parallel to the filter element 18 but at an approximately 45 degree angle thereto. The other elements correspond to those of FIG 1 and 2. This angled placement of the inlet opening 16 has the advantage that the holder 33 of the anti-drain membrane 26 may be designed as a clamping ring or alternatively even be injection molded onto the anti-drain membrane. This also protects the anti-drain membrane 26 if the liquid flowing in through the cylinder head 11 does not strike the anti-drain membrane 26 directly but at an angle.
FIG 4 shows an alternative arrangement of the anti-drain valve 28. Here, the valve seat 29 is formed by the coupling collar 27 and the valve disk 32, in an opposite arrangement of the compression spring 30, is pulled instead of pushed against the valve seat 29.
FIG 5 shows another option to configure the anti-drain valve 28. Here, the valve disk 32 is pulled against the valve seat 29 by a tension spring 36. The valve seat 29 is again positioned in the coupling collar 27, such that the anchoring of the tension spring is also implemented through the coupling collar 27.
The valve disk 32 of FIG 6 is pushed against the valve seat 29 and simultaneously centered by a conical compression spring 30. The valve seat 29 is again implemented through the coupling collar 27.
FIG 7 shows a variation in which the coupling collar 27 is implemented through a special embodiment of the cover plate 13. Because the displacement space 24 is not used here, the inlet opening 16 is realized in the cover plate 13. The cover plate 13 is preferably deep-drawn such that a concentric annular collar
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13a is formed in its interior and can then engage with the cylinder head 11 in a screwed connection 34.
In FIG 8 the top plate 14 forms the displacement space 24. The inlet opening 16 is then realized in the top plate 14, and an anti-drain membrane 26 is again disposed on the top plate 14 via the mount 33. The liquid coming out of the cylinder head 11 thus flows through the inlet opening 16 into the displacement space 24 and from there through the passage 25 in the cover plate 13 into the unfiltered space of the liquid cartridge filter 10. Here, the counterbearing for the compression spring 30 of the anti-drain valve 28 is formed by the upper end disk 20 of the filter element 18. At the same time, the end disk 20 also forms the valve seat 29 for the valve disk 32.
As an alternative, as shown in FIG 9, the valve seat 29 may also be formed by a suitable configuration of the cover plate 13, such that the upper end disk 20 acts only as a counterbearing for the compression spring 30. The sealing face of the anti-drain valve 28 is formed by the valve seat 29 of the cover plate and the valve disk 32.
To protect the anti-drain membrane 26, it is also possible to form a baffle plate 37 as part of the top plate 14 as shown in FIG 10 to cover the anti-drain membrane 26 over a certain region and thereby prevent direct contact between the inflowing liquid and the anti-drain membrane 26. Here it may be seen that the liquid flowing through the inlet opening 38 formed in the cylinder head 11 would strike the anti-drain membrane 26 directly.
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We Claims :
1. Liquid cartridge filter, particularly for the lubricating oil of an internal combustion engine, having a substantially cup-shaped housing with a concentrically disposed outlet opening for the filtered liquid and at least one inlet opening for the liquid to be filtered, a filter element sealingly disposed between the inlet opening and the outlet opening, wherein the housing is connected to a top plate and the top plate is coupled to an end plate, characterized in that the top plate encloses a displacement space which is disposed in an inlet space in the mating part, such that the inlet opening in the top plate is disposed in the region of the displacement space and/or an anti-drain valve is disposed in the region of the outlet opening, wherein the anti-drain valve is disposed axially outside the effective filter element surface.
2. Liquid cartridge filter as claimed in claim 1, characterized in that the anti-drain valve comprises a spring means to create a press fit on a sealing face, wherein the spring means is compression loaded.
3. Liquid cartridge filter as claimed in claim 1, characterized in that the anti-drain valve comprises a spring means to create a press fit on a sealing face, wherein the spring means is tension loaded.
4. Liquid cartridge filter as claimed in any one of the preceding claims, characterized in that an anti-drain membrane is disposed in the region of the displacement space, such that the liquid cannot flow out of the liquid cartridge filter when the cartridge filter is removed.
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6. Liquid cartridge filter as claimed in claim 4, characterized in that the anti-drain membrane is non-releasably connected to the top plate.
7. Liquid cartridge filter as claimed in any one of the preceding claims, characterized in that the top plate has a sealing means at its outer axial end to seal the connection between the liquid cartridge filter and the mating part.
8. Liquid cartridge filter as claimed in any one of the preceding claims, characterized in that a means for releasably coupling the liquid cartridge filter with a mating part is disposed concentrically in the region of the cover plate, wherein the coupling means extends axially beyond the contour of the liquid cartridge filter.
9. Liquid cartridge filter as claimed in claim 7, characterized in that the releasable coupling means is a concentric annular collar having an external thread.
10. Liquid cartridge filter as claimed in either one of claims 7 or 8, characterized in that the releasable coupling means is integrally formed from the end plate, wherein the end plate further has at least one opening which communicates with the at least one inlet opening.
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10. Liquid cartridge filter as claimed in either one of claims 7 or 8, characterized in that the releasable coupling means is releasably or non-releasably connected to the end plate so as to form a seal, wherein the end plate furthermore has at least one opening which communicates with the at least one inlet opening.






Dated this 14™ day of December, 2005.


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ABSTRACT
The invention relates to a liquid cartridge filter, particularly for the lubricating oil of an internal combustion engine, having a substantially cup-shaped housing with a concentrically disposed outlet opening for the filtered liquid and at least one inlet opening for the liquid to be filtered and a filter element sealingly disposed between the inlet opening and the outlet opening. The housing is connected to a top plate, and the top plate is connected to an end plate. The top plate encloses a displacement space which is disposed in an inlet space in the mating part, such that the inlet opening in the top plate is disposed in the region of the displacement space and/or an anti-drain valve is disposed in the region of the outlet opening, such that the anti-drain valve is disposed axially outside the effective filter element surface.
FIG 1.
The Controller of Patents The Patent Office
Mumbai.
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Documents:

1590-MUM-2005-ABSTRACT(16-12-2005).pdf

1590-mum-2005-abstract.doc

1590-mum-2005-abstract.tif

1590-MUM-2005-CANCELLED PAGES(16-12-2010).pdf

1590-MUM-2005-CLAIMS(AMENDED)-(16-12-2010).pdf

1590-MUM-2005-CLAIMS(AMENDED)-(2-5-2011).pdf

1590-MUM-2005-CLAIMS(GRANTED)-(5-7-2011).pdf

1590-MUM-2005-CLAIMS(MARKED COPY)-(16-12-2010).pdf

1590-MUM-2005-CLAIMS(MARKED COPY)-(2-5-2011).pdf

1590-mum-2005-claims.doc

1590-mum-2005-claims.pdf

1590-mum-2005-correspondence(14-8-2007).pdf

1590-MUM-2005-CORRESPONDENCE(16-12-2010).tif

1590-MUM-2005-CORRESPONDENCE(19-4-2011).pdf

1590-MUM-2005-CORRESPONDENCE(IPO)-(7-7-2011).pdf

1590-mum-2005-correspondence-other.pdf

1590-mum-2005-correspondence-received.pdf

1590-mum-2005-description (complete).pdf

1590-MUM-2005-DESCRIPTION(GRANTED)-(5-7-2011).pdf

1590-MUM-2005-DRAWING(16-12-2010).pdf

1590-MUM-2005-DRAWING(GRANTED)-(5-7-2011).pdf

1590-mum-2005-drawings.pdf

1590-MUM-2005-ENGLISH TRANSLATION(16-12-2010).pdf

1590-MUM-2005-FORM 1(16-12-2010).pdf

1590-mum-2005-form 18(14-8-2007).pdf

1590-MUM-2005-FORM 2(TITLE PAGE)-(16-12-2005).pdf

1590-MUM-2005-FORM 2(TITLE PAGE)-(16-12-2010).pdf

1590-MUM-2005-FORM 2(TITLE PAGE)-(GRANTED)-(5-7-2011).pdf

1590-MUM-2005-FORM 26(16-12-2010).pdf

1590-MUM-2005-FORM 26(19-4-2011).pdf

1590-MUM-2005-FORM 26(2-5-2011).pdf

1590-MUM-2005-FORM 3(16-12-2005).pdf

1590-MUM-2005-FORM 3(16-12-2010).pdf

1590-MUM-2005-FORM 5(16-12-2005).pdf

1590-MUM-2005-FORM 5(16-12-2010).pdf

1590-mum-2005-form-1.pdf

1590-mum-2005-form-2.doc

1590-mum-2005-form-2.pdf

1590-mum-2005-form-3.pdf

1590-mum-2005-form-5.pdf

1590-MUM-2005-OTHER DOCUMENT(16-12-2010).pdf

1590-MUM-2005-PETITION UNDER RULE 137(16-12-2010).pdf

1590-MUM-2005-REPLY TO EXAMINATION REPORT(16-12-2010).pdf

1590-MUM-2005-REPLY TO HEARING(2-5-2011).pdf

1590-MUM-2005-SPECIFICATION(AMENDED)-(16-12-2010).pdf

abstract1.jpg


Patent Number 248340
Indian Patent Application Number 1590/MUM/2005
PG Journal Number 27/2011
Publication Date 08-Jul-2011
Grant Date 05-Jul-2011
Date of Filing 16-Dec-2005
Name of Patentee MANN+HUMMEL GMBH
Applicant Address D-71631 LUDWIGSBURG
Inventors:
# Inventor's Name Inventor's Address
1 Helmut Luka Eisenachweg 13, 71672
2 Markus Kolczyk Dammweg 16, 74395 Mundelsheim
3 Dieter Schreckenberger Erfurter Weg 16 71672 Marbach
4 Rainer Loos Uhlandstr. 28 71691 Freiberg
PCT International Classification Number F01M11/03,B01D27/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102004061109.2 2004-12-16 Germany