WO2001019491A1 - Filter for liquids - Google Patents

Filter for liquids Download PDF

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Publication number
WO2001019491A1
WO2001019491A1 PCT/EP2000/008993 EP0008993W WO0119491A1 WO 2001019491 A1 WO2001019491 A1 WO 2001019491A1 EP 0008993 W EP0008993 W EP 0008993W WO 0119491 A1 WO0119491 A1 WO 0119491A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
liquid
metal plate
filter housing
housing
Prior art date
Application number
PCT/EP2000/008993
Other languages
German (de)
French (fr)
Inventor
Wilhelm Ardes
Original Assignee
Ing. Walter Hengst Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ing. Walter Hengst Gmbh & Co. Kg filed Critical Ing. Walter Hengst Gmbh & Co. Kg
Publication of WO2001019491A1 publication Critical patent/WO2001019491A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B01D35/31—Filter housing constructions including arrangements for environmental protection, e.g. pressure resisting features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/42—Installation or removal of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/30—Filter housing constructions
    • B01D2201/301—Details of removable closures, lids, caps, filter heads
    • B01D2201/305—Snap, latch or clip connecting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter

Definitions

  • the present invention relates to a liquid filter, in particular for fuel or oil of an internal combustion engine, the liquid filter comprising a filter housing with at least one liquid inlet and liquid return channel each, a releasable cover which closes the filter housing in a liquid-tight manner and an exchangeable filter insert, and the liquid filter sealingly having a filter connection flange , e.g. an internal combustion engine, can be screwed, for which purpose a screw fastening element is arranged on the front side of the filter housing facing the filter connection flange, which has a central opening forming the liquid return channel with an internal thread that can be screwed to a threaded connector of the filter connection flange.
  • a filter connection flange e.g. an internal combustion engine
  • a liquid filter of the type mentioned is known from DE-U-94 11 212.
  • the screw fastening element consists of a steel screw machined by turning and milling, which is arranged in the center of the end face of the filter housing of the liquid filter.
  • An end wall of the filter housing extends radially outward from the peripheral region of the screw to the outer periphery of the filter housing, where sealing takes place against a counter surface of the filter connection flange.
  • the filter housing must consist of a relatively stable and rigid material, which in practice is usually die-cast aluminum with sufficient wall thickness.
  • a disadvantage of this known prior art is that both the filter housing and the central screw have to be machined, which causes relatively high processing costs.
  • the use of less stable or relaxing materials for the manufacture of the filter housing is ruled out in the known liquid filter, because such materials could not transmit the required forces safely and because they could not ensure permanent stability and tightness.
  • spin-on filters have long been known, e.g. from GB 1 449 853, which have a housing made of sheet metal with a metallic end wall with a greater material thickness. The front wall and the rest of the housing are permanently connected to each other; there is no removable lid. Therefore, when the filter insert is exhausted, only the complete filter can be replaced, which is no longer acceptable today for environmental reasons.
  • the object of the present invention is therefore to create a liquid filter of the type mentioned at the outset which avoids the disadvantages mentioned and in which, in particular, the manufacture is simplified and therefore less expensive and in which less stable and therefore less expensive without the risk of leaks or other damage Material for the fil- tergeophuse can be used, an exchange of the filter insert should remain possible when the remaining filter is used.
  • That the filter housing is a plastic injection molded part or a light metal die-cast part
  • That the screw fastening element is a metal plate which forms the predominantly area of the end face of the filter housing and
  • the screw fastening element designed as a metal plate is advantageously a relatively simple and therefore inexpensive workpiece.
  • the metal plate as a screw fastening element can easily be dimensioned in a sufficiently stable manner for all loads that occur, without the need for particularly large material thicknesses.
  • the metal plate in the assembled state of the filter with its radially outer region presses the filter housing axially against the filter connection flange, it is achieved that no more forces have to be transmitted in the radial direction from the inside to the outside within the filter housing; this power transmission is carried out by the metal plate. Therefore, materials can be used for the filter housing that have a lower rigidity and stability, such as plastic or light metal, without this affecting the functional reliability of the liquid filter.
  • the filter insert can be replaced if necessary, whereby all other parts of the filter can continue to be used.
  • this is preferably a die-cut, embossed and / or deep-drawn part made of sheet steel or a die-cast part made of die-cast aluminum.
  • the metal plate can be held captively in the remaining filter housing. This creates the possibility to completely pre-assemble the liquid filter including the filter insert built into it at the filter manufacturer and to deliver it to the user in this condition. At the user, e.g. an automobile manufacturer, then only the complete liquid filter has to be connected to the filter connection flange, e.g. an internal combustion engine to be screwed on; the liquid filter is then immediately ready for use.
  • the filter connection flange e.g. an internal combustion engine to be screwed on
  • the metal plate In order to hold the metal plate captively in the filter housing, it can be injected or cast into the rest of the filter housing.
  • the metal plate has a non-circular, preferably a polygonal or toothed outer circumference and is inserted into the rest of the filter housing in a press fit or form fit and thus non-rotatably.
  • the metal plate With a regular polygon or toothing, the metal plate can be positioned in several angular positions relative to the rest of the housing, which is advantageous for applications in which a certain orientation of the housing in its circumferential direction relative to the filter connection flange is necessary.
  • liquid filter suggests that the metal plate has a substantially circular outer circumference and into the remaining filter housing is loose and rotatable relative to this.
  • this embodiment of the liquid filter there is the advantageous possibility of first positioning the filter housing on the filter connection flange in a suitable position as viewed in the initial direction and then locking it in this position by screwing the metal plate tight.
  • This solution is particularly useful when the liquid filter is not rotationally symmetrical when viewed in the circumferential direction and therefore has a preferred position when viewed in the circumferential direction, which it should have after it has been installed.
  • Any layer can advantageously be produced in a stepless manner. The filter insert is inserted and the filter housing is closed using the cover after the metal plate has been screwed on.
  • the invention proposes that the metal plate has at least one opening outside its center at a distance from the central liquid return channel which forms the liquid inlet channel.
  • the metal plate can be provided with one or more openings in a very simple manner during its manufacture, so that the arrangement of channels can be omitted in the filter housing which is usually produced in an injection or casting process, which considerably simplifies the manufacture of the housing.
  • the metal plate have a plurality of openings arranged uniformly distributed in the circumferential direction on a circular line. This ensures that, on the one hand, the inflowing liquid to be filtered finds a low flow resistance when flowing through the metal plate and, on the other hand, that when the metal plate is loosely inserted into the housing, the openings as connecting elements for a screw mechanism. can be used for screwing on the metal plate. By means of a screwing tool engaging with the openings, the torques required for the sufficient screwing of the metal plate can be introduced into the metal plate without problems and in particular without damage.
  • the openings are formed by tabs bent axially outward from the metal plate, the axially outer end faces of which lie in the course and in the plane of the flange-side, radially outer end face of the filter housing.
  • the ends of the metallic tabs stand on the metallic filter connection flange in the assembled state, which ensures that a tight fit of the filter on the connection flange is maintained even in the long term, even if a relaxing material, e.g. Plastic, is used.
  • a first way to ensure the tightness of the connection between the filter and the connecting flange is that the flange-side, radially outer end face of the filter housing is provided with a sealing contour, preferably with a sealing lip, in its molded or cast part, the liquid filter being in the assembled state End face with the sealing contour lies sealingly on the filter connection flange. It is not necessary to insert a separate seal here, which simplifies filter assembly.
  • a seal can be provided between the filter connection flange and the flange-side, radially outer end face of the filter housing, an annular groove for receiving a sealing ring as a seal being preferably provided in the radially outer end face, and the sealing ring in the relaxed state protrudes from the groove in the axial direction of the filter housing and, when the liquid filter is assembled, lies completely inside the annular groove with elastic deformation.
  • the sealing ring ensures tightness even when using a material that is not suitable for sealing the housing.
  • the sealing ring required for the axial seal can advantageously be included in the prefabrication of the filter.
  • the outer diameter of the metal plate is at least as large as the outer diameter of the annular groove and that the radially outer region of the metal plate, seen in the filter axial direction, is behind the Ring groove lies. So that the outer circumference of the metal plate is such that only purely axial forces from the metal plate have to be introduced into the filter housing.
  • the filter housing does not have to absorb shear forces or other unfavorable forces.
  • the metal plate has a pipe-socket-shaped section pointing into the filter housing and surrounding the liquid return channel, on the outer circumference of which the filter insert can be attached in a sealing manner.
  • a pipe socket-shaped section can easily be integrally formed in the manufacture of the metal plate, so that no additional production costs are incurred as a result.
  • liquid drain opening In order to be able to drain the liquid in the liquid filter in a controlled manner before changing the filter insert, one can be in operation on the circumferential side in the filter housing and / or on the circumferential or front side in the cover a closed, if necessary releasable liquid drain opening can be provided for emptying the filter housing. If such a liquid drain opening is provided on the liquid filter, the design of the liquid filter with the metal plate inserted in various angular positions or rotatably in the filter housing is expediently used in order to ensure that the liquid drain opening lies at the lowest point of the mounted liquid filter when the liquid filter is installed comes. It does not matter how the threads in the metal plate and on the threaded connector of the filter connection flange run.
  • FIG. 1 shows a liquid filter in a first embodiment in longitudinal section
  • FIG. 2 the liquid filter in a second embodiment, also in longitudinal section,
  • Figure 3 shows the liquid filter in a third embodiment, also in longitudinal section, and
  • FIG. 4 shows the liquid filter from FIG. 3 in cross section along the line IV-IV in FIG. 3.
  • FIG. 1 of the drawing shows, as the first exemplary embodiment of a liquid filter 1, a "lying" filter, that is to say a filter installed with an essentially horizontal longitudinal axis.
  • a filter connection flange 7 is visible, which is an integral part of an internal combustion engine, in particular the engine block of the internal combustion engine.
  • the execution of this filter final flange 7 corresponds to conventional flange designs that are available on many internal combustion engines for the attachment of screw-on easy-change filter cartridges.
  • the filter connection flange 7 does not have to be changed, so that the liquid filter 1 as a replacement for an exchangeable screw-on filter cartridge which is only completely replaceable and thus represents a considerable amount of waste and is environmentally harmful, also as a "spin-on" filter known, can serve.
  • the liquid filter 1 comprises a filter housing 2, which is closed by a screw cap 4. Inside the filter housing 2 and the cover 4 there is a filter insert 5 which can be replaced after unscrewing the cover 4 and which is supported on the inside by a support body 6 against the forces occurring during operation.
  • the radially outer part of the filter housing 2 is formed in the exemplary embodiment according to FIG. 1 by an injection molded part made of plastic.
  • a metal plate 3 forms the housing area lying on the end face 20 of the filter housing 2.
  • the metal plate 3 is preferably made of steel or of die-cast aluminum.
  • the metal plate 3 has an opening which forms a liquid return channel 34 for cleaned liquid and which is in flow connection with a corresponding channel arranged in the same way within the filter connection flange 7.
  • a plurality of openings 33 are provided in the metal plate 3 for supplying liquid to be cleaned, which openings are provided radially on the outside of the central opening 34 and are in flow connection with a correspondingly extending annular channel in the filter connection flange 7.
  • the metal plate 3 With its radially outer edge region 32, the metal plate 3 rests on a step near the front end of the filter housing 2. On the inner circumference of the central opening In order to form the liquid return channel 34, the metal plate 3 has an internal thread 30. To form a sufficient number of threads, the metal plate 3 is formed here in one piece with a pipe socket-shaped section 31 pointing towards the inside of the filter housing 2, which has a smooth cylindrical shape on the outside and the outer circumference of which Filter insert 5 is attached sealingly.
  • a circumferential groove 21 is provided on the end face 20 of the filter housing 2, into which a sealing ring 22, preferably an elastomer O-ring, is inserted.
  • the axial contact pressure required for the sealing is brought about by screwing the metal plate 3 to a threaded connector 70 of the filter connection flange 7.
  • the embodiment of the liquid filter 1 according to FIG. 1 shows a liquid drain opening 25 on the downward-facing side of the filter housing 2, which is closed tightly by a screw 26 during normal operation of the liquid filter 1.
  • the liquid drain opening 25 is opened only before a filter insert change in order to let the interior of the liquid filter 1 run empty, the empty running taking place in a targeted and controlled manner through the liquid drain opening 25.
  • a practically liquid-free filter insert 5 is then removed from the liquid filter 1 and replaced by a fresh filter insert 5.
  • the metal plate 3 in this exemplary embodiment is inserted loosely and rotatable relative to the filter housing 2.
  • the openings 33 in the metal plate 3 can advantageously be used to engage a screwing tool in order to be able to introduce the required torque into the metal plate 3 without problems.
  • the metal plate 3 presses purely in the axial direction on the part of the filter housing 2 between the metal plate 3 and the filter connection flange 7 in which the seal 22 is located.
  • a relatively light and therefore also inexpensive material can be used for the filter housing 2, preferably a plastic, such as polyamide, or a particularly light light metal, such as magnesium.
  • the exemplary embodiment according to FIG. 2 largely corresponds to the exemplary embodiment according to FIG. 1, and reference is therefore made to the description of FIG. 1 with regard to the reference numbers not mentioned again below.
  • the difference in the embodiment of the liquid filter 1 according to FIG. 2 is that no liquid drain opening is provided here.
  • the metal plate 3 it is also not necessary for the metal plate 3 to be rotatable relative to the filter housing 2. Therefore, in the exemplary embodiment according to FIG. 2, the metal plate 3 is embedded, in particular injected, in the material of the remaining filter housing 2 on its outer peripheral region 32. There is thus the possibility of completely pre-assembling the liquid filter 1 according to FIG. 2 and then screwing it onto the filter connection flange 7 in the completely pre-assembled state, as is known from conventional screw-on replaceable filter cartridges.
  • Figure 3 of the drawing shows an embodiment of a liquid filter 1 in a standing version.
  • the liquid filter 1 has a housing 2 with a screw cap 4.
  • a filter insert 5 is arranged inside the liquid filter 1 and is stabilized on the inside by a support body 6.
  • the face 20 of the filter housing 2, which faces downward here, is also formed here by a metal plate 3, which is essentially identical to the metal plates 3 of the liquid filters according to FIGS. 1 and 2.
  • a difference in the design of the metal plate 3 according to FIG. 3 is that here the openings 33, which form the liquid inlet channel, are formed by punched tabs 35 which are bent outwards in the axial direction, downwards in the drawing.
  • the openings 33 are located relatively far outward in the metal plate 3.
  • the bending line of the tabs 35 bent downward lies directly in front of the radially outer edge region 32 of the metal plate 3.
  • each tab 35 lies in the course and in the plane of the flange-side end face 27 of the filter housing 2. Furthermore, a circumferential groove 21 with a sealing 22 inserted therein is made in the end face 27, as well even with the liquid filters 1 according to FIGS. 1 and 2.
  • the advantage of this embodiment of the metal plate 3 is that in the assembled state of the liquid filter 1, as shown in FIG. 3, the axially outward-facing end faces 37 of the metallic tabs 35 directly open stand up also metallic filter connection flange 7. This allows the use of less stable and relaxing material, for example plastic, for the filter housing 2. Relaxation processes occurring therein then have for the security and tightness of the connection of the liquid filter 1 with the filter connection flange 7 no negative consequences.
  • the contact pressure for holding and sealing the liquid filter 1 is also applied here by the radially outer edge region 32 of the metal plate 3, the radially outer edge region 32 being behind the annular groove 21 and the sealing ring 22 inserted therein.
  • the metal plate 3 also has a central opening 34 here, which forms the liquid return channel.
  • the metal plate 3 has an axially inwardly directed pipe socket-shaped section 31, onto which the filter insert 5 is attached. Inside, this section 31 of the metal plate 3 has an internal thread, which is screwed here again with a threaded connector 70 of the filter connection flange 7.
  • FIG. 4 of the drawing shows the liquid filter 1 from FIG. 1 in section along the line IV-IV.
  • the threaded connector 70 of the filter connecting flange 7 is visible in the very center of FIG.
  • the pipe socket-shaped section 31 of the metal plate 3 is located around the outside thereof.
  • the metal plate 3 then extends outward to its radially outer edge region 32.
  • the filter housing 2 is finally cut out at the very outside.
  • FIG. 4 further shows, a total of eight tabs 35 and eight openings 33 are provided, which are distributed at a regular angular distance over the circumference.
  • the downward-facing tabs 35 are located in corresponding recesses in the lower end region of the filter housing 2, so that the metal plate 3 can be inserted into the filter housing 2 in a total of eight different angular positions, but rotatability between the metal plate 3 and the filter housing 2 is prevented.
  • the river six ⁇ filter 1 can thus be completely pre-assembled and then screwed onto the filter connection flange 7 as a complete unit.
  • the part of the filter housing 2 which is not formed by the metal plate 3 can also be formed by a light metal, such as magnesium or aluminum, both of which can be processed by the die-casting process.
  • the metal plate 3 and the remaining part of the filter housing 2 are relatively simple parts that can be produced advantageously with low manufacturing costs and ideally with tools and thus particularly economically.
  • the liquid filter 1 according to FIGS. 1 to 4 can, which is not specifically shown here, be equipped with further technical elements that are common in such liquid filters, such as non-return valves or membranes in the channels 33 and / or 34 or a bypass valve between raw side and clean side of filter 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a filter for liquids (1) with a filter housing (2) with a liquid inlet and a liquid return channel (33, 34), a detachable cap (4) and an exchangeable filter insert (5). Said filter (1) is screwed with a filter connecting flange (7) in a sealing manner. A screw fastening element (3) is mounted on the face (20) of the filter housing (2) that faces the filter connecting flange (7) in the mounted state. Said screw fastening element (3) has a central opening that forms the liquid return channel (34) and that is provided with an internal tread (30) that can be screwed with a threaded connection piece (70) of the filter connecting flange (7). The inventive filter for liquids is further characterized in that the filter housing (2) is a synthetic injection-molded part or a light-metal diecast part, the screw fastening element (3) is a metal plate that forms the major area of the front (20) of the filter housing (2) and the metal plate (3), in the mounted state of the filter (1), extends beyond the filter housing (2) with its radially outer zone (32) and presses a radially outer filter housing face (27) axially against the filter connecting flange (7).

Description

Beschreibung:Description:
Flüssigkeitsfilterliquid filters
Die vorliegende Erfindung betrifft ein Flüssigkeitsfilter, insbesondere für Kraftstoff oder Öl einer Brennkraftmaschine, wobei das Flüssigkeitsfilter ein Filtergehäuse mit mindestens je einem Flüssigkeitszulauf- und Flussigkeitsrucklaufkanal, einen das Filtergehäuse flüssigkeitsdicht verschließenden, lösbaren Deckel und einen austauschbaren Filtereinsatz umfaßt und wobei das Flüssigkeitsfilter dichtend mit einem Filteranschlußflansch, z.B. einer Brennkraftmaschine, verschraubbar ist, wozu an der im montierten Zustand dem Filteranschlußflansch zugewandten Stirnseite des Filtergehauses ein Schraubbefestigungselement angeordnet ist, das eine zentrale, den Flussigkeitsrucklaufkanal bildende Durchbrechung mit einem mit einem Gewindestutzen des Filteranschlußflan- sches verschraubbaren Innengewinde aufweist.The present invention relates to a liquid filter, in particular for fuel or oil of an internal combustion engine, the liquid filter comprising a filter housing with at least one liquid inlet and liquid return channel each, a releasable cover which closes the filter housing in a liquid-tight manner and an exchangeable filter insert, and the liquid filter sealingly having a filter connection flange , e.g. an internal combustion engine, can be screwed, for which purpose a screw fastening element is arranged on the front side of the filter housing facing the filter connection flange, which has a central opening forming the liquid return channel with an internal thread that can be screwed to a threaded connector of the filter connection flange.
Ein Flüssigkeitsfilter der genannten Art ist aus der DE-U-94 11 212 bekannt. Bei diesem bekannten Flüssigkeitsfilter besteht das Schraubbefestigungselement aus einer durch Drehen und Fräsen bearbeiteten Stahlschrau- be, die im Zentrum der Stirnseite des Filtergehäuses des Flüssigkeitsfilters angeordnet ist. Vom Umfangsbereich der Schraube erstreckt sich eine Stirnwand des Filtergehauses radial nach außen bis zum Außenumfang des Filtergehäuses, wo die Abdichtung gegen eine Gegenfläche des Filteranschlußflansches erfolgt. Die für die axiale Ab-A liquid filter of the type mentioned is known from DE-U-94 11 212. In this known liquid filter, the screw fastening element consists of a steel screw machined by turning and milling, which is arranged in the center of the end face of the filter housing of the liquid filter. An end wall of the filter housing extends radially outward from the peripheral region of the screw to the outer periphery of the filter housing, where sealing takes place against a counter surface of the filter connection flange. The for the axial
BESTATIGUNGSKOPIE dichtung erforderlichen Anpreßkräfte werden von der zentralen Schraube aufgebracht und über die mit dem übrigen Filtergehäuse einstückige Stirnwand zum Außenumfang des Filtergehauses und zur dort angeordnete Dichtung übertragen. Aus diesem Grund muß das Filtergehäuse aus einem relativ stabilen und biegesteifen Material bestehen, das in der Praxis überlicherweise Druckguß-Aluminium in ausreichender Wandstärke ist.BESTATIGUNGSKOPIE The necessary contact pressure forces are applied by the central screw and transmitted to the outer circumference of the filter housing and to the seal arranged there via the end wall which is integral with the remaining filter housing. For this reason, the filter housing must consist of a relatively stable and rigid material, which in practice is usually die-cast aluminum with sufficient wall thickness.
Als nachteilig wird bei diesem bekannten Stand der Technik angesehen, daß sowohl das Filtergehäuse als auch die zentrale Schraube spanend bearbeitet werden müssen, was relativ hohe Bearbeitungskosten verursacht. Außerdem scheidet bei dem bekannten Flüssigkeitsfilter die Verwendung von weniger stabilen oder relaxierenden Materialien für die Herstellung des Filtergehauses aus, weil solche Materialien die erforderlichen Kräfte nicht sicher übertragen könnten und weil sie keine dauerhafte Stabilität und Dichtigkeit gewährleisten könnten.A disadvantage of this known prior art is that both the filter housing and the central screw have to be machined, which causes relatively high processing costs. In addition, the use of less stable or relaxing materials for the manufacture of the filter housing is ruled out in the known liquid filter, because such materials could not transmit the required forces safely and because they could not ensure permanent stability and tightness.
Weiterhin sind seit langen sogenannte "Spin-on"-Filter bekannt, z.B. aus der GB 1 449 853, die ein Gehäuse aus Metallblech mit einer metallische Stirnwand mit größerer Materialstärke aufweisen. Die Stirnwand und das übrige Gehäuse sind dauerhaft miteinander verbunden; ein abnehmbarer Deckel ist nicht vorhanden. Deshalb kann bei Erschöpfung des Filtereinsatzes nur das komplette Filter ersetzt werden, was heutzutage aus Umweltschutzgründen nicht mehr akzeptabel ist.Furthermore, so-called "spin-on" filters have long been known, e.g. from GB 1 449 853, which have a housing made of sheet metal with a metallic end wall with a greater material thickness. The front wall and the rest of the housing are permanently connected to each other; there is no removable lid. Therefore, when the filter insert is exhausted, only the complete filter can be replaced, which is no longer acceptable today for environmental reasons.
Für die vorliegende Erfindung stellt sich deshalb die Aufgabe, ein Flüssigkeitsfilter der eingangs genannten Art zu schaffen, das die aufgeführten Nachteile vermeidet und bei dem insbesondere die Herstellung vereinfacht und damit kostengünstiger ist und bei dem ohne Gefahr von Undichtigkeiten oder anderen Schäden weniger stabiles und deshalb kostengünstigeres Material für das Fil- tergehäuse verwendet werden kann, wobei ein Austausch des Filtereinsatzes bei Weiterverwendung des übrigen Filters möglich bleiben soll.The object of the present invention is therefore to create a liquid filter of the type mentioned at the outset which avoids the disadvantages mentioned and in which, in particular, the manufacture is simplified and therefore less expensive and in which less stable and therefore less expensive without the risk of leaks or other damage Material for the fil- tergehäuse can be used, an exchange of the filter insert should remain possible when the remaining filter is used.
Die Lösung dieser Aufgabe gelingt erfindungsgemäß durch ein Flüssigkeitsfilter der eingangs genannten Art, das dadurch gekennzeichnet ist,This object is achieved according to the invention by a liquid filter of the type mentioned at the outset, which is characterized in that
- daß das Filtergehäuse ein Kunststoff-Spritzgußteil oder ein Leichtmetall-Druckgußteil ist,- That the filter housing is a plastic injection molded part or a light metal die-cast part,
- daß das Schraubbefestigungselement eine Metallplatte ist, die den flächenmäßig überwiegenden Teil der Stirnseite des Filtergehäuses bildet und- That the screw fastening element is a metal plate which forms the predominantly area of the end face of the filter housing and
- daß die Metallplatte im montierten Zustand des Filters mit ihrem radial äußeren Bereich das Filtergehäuse hintergreift und eine radial äußere Filtergehäusestirnfläche axial an den Filteranschlußflansch anpreßt.- That the metal plate engages behind the filter housing with its radially outer region in the assembled state of the filter and axially presses a radially outer filter housing end face onto the filter connection flange.
Vorteilhaft ist das als Metallplatte ausgeführte Schraubbefestigungselement ein relativ einfach und damit kostengünstig herstellbares Werkstück. Zugleich ist die Metallplatte als Schraubbefestigungselement für alle auftretenden Belastungen problemlos ausreichend stabil dimensio- nierbar, ohne daß dafür besonders große Materialstärken nötig wären. Dadurch, daß die Metallplatte im montierten Zustand des Filters mit ihrem radial äußeren Bereich das Filtergehäuse axial an den Filteranschlußflansch anpreßt, wird erreicht, daß innerhalb des Filtergehäuses keine Kräfte mehr in Radialrichtung von innen nach außen übertragen werden müssen; diese Kraftübertragung übernimmt die Metallplatte. Deshalb können für das Filtergehäuse Materialien verwendet werden, die eine geringere Steifigkeit und Stabilität aufweisen, wie z.B. Kunststoff oder Leichtmetall, ohne daß hierdurch die Funktionssicherheit des Flüssigkeitsfilters beeinträchtigt wird. Zugleich kann der Filtereinsatz bei Bedarf ausgewechselt werden, wobei alle anderen Teile des Filters weiterverwendet werden können. Aus Gründen einer möglichst zeit- und kostensparenden Herstellung der Metallplatte ist diese vorzugsweise ein werkzeugfallendes Stanz-, Präge- und/oder Tiefziehteil aus Stahlblech oder ein werkzeugfallendes Druckgußteil aus Druckgußaluminium.The screw fastening element designed as a metal plate is advantageously a relatively simple and therefore inexpensive workpiece. At the same time, the metal plate as a screw fastening element can easily be dimensioned in a sufficiently stable manner for all loads that occur, without the need for particularly large material thicknesses. Characterized in that the metal plate in the assembled state of the filter with its radially outer region presses the filter housing axially against the filter connection flange, it is achieved that no more forces have to be transmitted in the radial direction from the inside to the outside within the filter housing; this power transmission is carried out by the metal plate. Therefore, materials can be used for the filter housing that have a lower rigidity and stability, such as plastic or light metal, without this affecting the functional reliability of the liquid filter. At the same time, the filter insert can be replaced if necessary, whereby all other parts of the filter can continue to be used. For reasons of a time and cost-saving production of the metal plate, this is preferably a die-cut, embossed and / or deep-drawn part made of sheet steel or a die-cast part made of die-cast aluminum.
In einer ersten weiteren Ausgestaltung des Flüssigkeits- filters kann die Metallplatte unverlierbar im übrigen Filtergehäuse gehaltert sein. Hierdurch wird die Möglichkeit geschaffen, beim Filterhersteller das Flüssigkeits- filter einschließlich darin eingebautem Filtereinsatz komplett vorzumontieren und in diesem Zustand dem Verwender zuzuliefern. Beim Verwender, z.B. einem Automobilhersteller, muß dann nur noch das komplette Flüssigkeitsfilter an den Filteranschlußflansch, z.B. einer Brennkraft- aschine, angeschraubt werden; danach ist das Flüssig- keitsfilter sofort einsatzbereit.In a first further embodiment of the liquid filter, the metal plate can be held captively in the remaining filter housing. This creates the possibility to completely pre-assemble the liquid filter including the filter insert built into it at the filter manufacturer and to deliver it to the user in this condition. At the user, e.g. an automobile manufacturer, then only the complete liquid filter has to be connected to the filter connection flange, e.g. an internal combustion engine to be screwed on; the liquid filter is then immediately ready for use.
Um die Metallplatte unverlierbar im Filtergehäuse zu hal- tern, kann sie in das übrige Filtergehäuse eingespritzt oder eingegossen sein.In order to hold the metal plate captively in the filter housing, it can be injected or cast into the rest of the filter housing.
Eine alternative Möglichkeit für die Gestaltung der Metallplatte besteht darin, daß diese einen nicht-kreisförmigen, vorzugsweise einen mehrkantigen oder gezahnten Außenumfang aufweist und in das übrige Filtergehäuse im Preßsitz oder Formschluß und somit unverdrehbar eingesetzt ist. Bei einer regelmäßigen Mehrkantigkeit oder Verzahnung kann die Metallplatte in mehreren Winkellagen relativ zum übrigen Gehäuse positioniert werden, was für solche Anwendungen von Vorteil ist, bei denen eine bestimmte Orientierung des Gehäuses in seiner Umfangsrich- tung relativ zum Filteranschlußflansch nötig ist.An alternative possibility for the design of the metal plate is that it has a non-circular, preferably a polygonal or toothed outer circumference and is inserted into the rest of the filter housing in a press fit or form fit and thus non-rotatably. With a regular polygon or toothing, the metal plate can be positioned in several angular positions relative to the rest of the housing, which is advantageous for applications in which a certain orientation of the housing in its circumferential direction relative to the filter connection flange is necessary.
Eine weitere alternative Ausgestaltung des Flüssigkeits- filters schlägt vor, daß die Metallplatte einen im wesentlichen kreisförmigen Außenumfang aufweist und in das übrige Filtergehäuse lose und relativ zu diesem verdrehbar eingesetzt ist. Bei dieser Ausführung des Flüssigkeitsfilters besteht die vorteilhafte Möglichkeit, zunächst das Filtergehäuse am Filteranschlußflansch in einer passenden Position in U fangsrichtung betrachtet zu positionieren und dann in dieser Position durch Festschrauben der Metallplatte zu arretieren. Diese Lösung ist insbesondere dann sinnvoll, wenn das Flüssigkeitsfilter in Umfangsrichtung betrachtet nicht rotationssymme- trisch aufgebaut ist und deshalb in Umfangsrichtung betrachtet eine Vorzugslage aufweist, die es nach seinem Einbau aufweisen soll. Vorteilhaft ist hier jede beliebige Lage stufenlos herstellbar. Das Einsetzen des Filtereinsatzes und das Verschließen des Filtergehauses mittels des Deckels erfolgt hier nach dem Festschrauben der Metallplatte.Another alternative embodiment of the liquid filter suggests that the metal plate has a substantially circular outer circumference and into the remaining filter housing is loose and rotatable relative to this. In this embodiment of the liquid filter, there is the advantageous possibility of first positioning the filter housing on the filter connection flange in a suitable position as viewed in the initial direction and then locking it in this position by screwing the metal plate tight. This solution is particularly useful when the liquid filter is not rotationally symmetrical when viewed in the circumferential direction and therefore has a preferred position when viewed in the circumferential direction, which it should have after it has been installed. Any layer can advantageously be produced in a stepless manner. The filter insert is inserted and the filter housing is closed using the cover after the metal plate has been screwed on.
Weiter schlägt die Erfindung vor, daß die Metallplatte außerhalb ihres Zentrums im Abstand von dem zentralen Flussigkeitsrucklaufkanal wenigstens eine Durchbrechung aufweist, die den Flüssigkeitszulaufkanal bildet. Die Metallplatte kann bei ihrer Herstellung sehr einfach mit einer oder mehreren Durchbrechungen versehen werden, so daß bei dem üblicherweise in einem Spritz- oder Gießverfahren hergestellten Filtergehäuse die Anordnung von Kanälen entfallen kann, was die Gehäuseherstellung wesentlich vereinfacht.Furthermore, the invention proposes that the metal plate has at least one opening outside its center at a distance from the central liquid return channel which forms the liquid inlet channel. The metal plate can be provided with one or more openings in a very simple manner during its manufacture, so that the arrangement of channels can be omitted in the filter housing which is usually produced in an injection or casting process, which considerably simplifies the manufacture of the housing.
Eine diesbezügliche Weiterbildung des Flüssigkeitsfil- ters schlägt vor, daß die Metallplatte mehrere gleichmäßig in Umfangsrichtung verteilt auf einer Kreislinie angeordnete Durchbrechungen aufweist. Hierdurch wird erreicht, daß zum einen die zufließende, zu filternde Flüssigkeit einen geringen Strömungswiderstand beim Durchströmen der Metallplatte vorfindet und daß zum anderen bei lose in das Gehäuse einzulegender Metallplatte die Durchbrechungen als Anschlußelemente für ein Schraubwerk- zeug für das Anschrauben der Metallplatte genutzt werden können. Mittels eines mit den Durchbrechungen in Eingriff tretenden Schraubwerkzeuges können die für das ausreichende Festschrauben der Metallplatte erforderlichen Drehmomente problemlos und insbesondere für die Metallplatte schadlos in diese eingebracht werden.A further development of the liquid filter in this regard suggests that the metal plate have a plurality of openings arranged uniformly distributed in the circumferential direction on a circular line. This ensures that, on the one hand, the inflowing liquid to be filtered finds a low flow resistance when flowing through the metal plate and, on the other hand, that when the metal plate is loosely inserted into the housing, the openings as connecting elements for a screw mechanism. can be used for screwing on the metal plate. By means of a screwing tool engaging with the openings, the torques required for the sufficient screwing of the metal plate can be introduced into the metal plate without problems and in particular without damage.
In weiterer Ausgestaltung wird vorgeschlagen, daß die Durchbrechungen durch aus der Metallplatte axial nach außen gebogene Laschen gebildet sind, deren axial äußere Stirnenden im Verlauf und in der Ebene der flanschseiti- gen, radial äußeren Stirnfläche des Filtergehauses liegen. Bei dieser Ausführung stehen im montierten Zustand die Stirnenden der metallischen Laschen auf dem metallischen Filteranschlußflansch auf, was gewährleistet, daß ein fester Sitz des Filters auf dem Anschlußflansch auch auf Dauer erhalten bleibt, selbst wenn für das Filtergehäuse ein relaxierendes Material, z.B. Kunststoff, verwendet wird.In a further embodiment it is proposed that the openings are formed by tabs bent axially outward from the metal plate, the axially outer end faces of which lie in the course and in the plane of the flange-side, radially outer end face of the filter housing. In this version, the ends of the metallic tabs stand on the metallic filter connection flange in the assembled state, which ensures that a tight fit of the filter on the connection flange is maintained even in the long term, even if a relaxing material, e.g. Plastic, is used.
Eine erste Möglichkeit zur Sicherstellung der Dichtigkeit der Verbindung zwischen Filter und Anschlußflansch besteht darin, daß die flanschseitige, radial äußere Stirnfläche des Filtergehauses in ihrem gespritzten oder gegossenen Teil mit einer Dichtkontur, vorzugsweise mit einer Dichtlippe, versehen ist, wobei in montiertem Zustand des Flüssigkeitsfilters die Stirnfläche mit der Dichtkontur dichtend am Filteranschlußflansch anliegt. Das Einlegen einer separaten Dichtung ist hier nicht nötig, was die Filtermontage vereinfacht.A first way to ensure the tightness of the connection between the filter and the connecting flange is that the flange-side, radially outer end face of the filter housing is provided with a sealing contour, preferably with a sealing lip, in its molded or cast part, the liquid filter being in the assembled state End face with the sealing contour lies sealingly on the filter connection flange. It is not necessary to insert a separate seal here, which simplifies filter assembly.
Alternativ dazu kann eine Dichtung zwischen dem Filteranschlußflansch und der flanschseitigen, radial äußeren Stirnfläche des Filtergehäuses vorgesehen sein, wobei vorzugsweise in der radial äußeren Stirnfläche eine Ringnut zur Aufnahme eines Dichtrings als Dichtung vorgesehen ist und wobei der Dichtring in entspanntem Zustand in Axialrichtung des Filtergehauses aus der Nut vorsteht und in montiertem Zustand des Flüssigkeitsfilters unter elastischer Verformung vollständig innerhalb der Ringnut liegt. Mit dem Dichtring wird die Dichtigkeit auch bei Verwendung eines zum Abdichten nicht geeigneten Materials für das Gehäuse gewährleistet. Bei der bevorzugten Ausführung mit der Ringnut kann vorteilhaft der für die axiale Abdichtung erforderliche Dichtring in die Vorfertigung des Filters einbezogen werden.Alternatively, a seal can be provided between the filter connection flange and the flange-side, radially outer end face of the filter housing, an annular groove for receiving a sealing ring as a seal being preferably provided in the radially outer end face, and the sealing ring in the relaxed state protrudes from the groove in the axial direction of the filter housing and, when the liquid filter is assembled, lies completely inside the annular groove with elastic deformation. The sealing ring ensures tightness even when using a material that is not suitable for sealing the housing. In the preferred embodiment with the annular groove, the sealing ring required for the axial seal can advantageously be included in the prefabrication of the filter.
Um eine möglichst gute Einleitung der von der Metallplatte aufgebrachten axialen Anpreßkräfte in das Filtergehäuse zu erzielen, ist vorgesehen, daß der Außendurchmesser der Metallplatte mindestens so groß ist wie der Außendurchmesser der Ringnut und daß der radial äußere Bereich der Metallplatte in Filter-Axialrichtung gesehen hinter der Ringnut liegt. Damit liegt der Außenumfang der Metallplatte so, daß nur rein axiale Kräfte von der Metallplatte in das Filtergehäuse eingebracht werden müssen. Scherkräfte oder sonstige ungünstige Kräfte muß das Filtergehäuse dabei nicht aufnehmen.In order to achieve the best possible introduction of the axial contact forces exerted by the metal plate into the filter housing, it is provided that the outer diameter of the metal plate is at least as large as the outer diameter of the annular groove and that the radially outer region of the metal plate, seen in the filter axial direction, is behind the Ring groove lies. So that the outer circumference of the metal plate is such that only purely axial forces from the metal plate have to be introduced into the filter housing. The filter housing does not have to absorb shear forces or other unfavorable forces.
Eine weitere Maßnahme zur möglichst einfachen und damit kostengünstigen Ausführung des Flüssigkeitsfilters besteht darin, daß die Metallplatte einen in das Filtergehäuse weisenden, den Flussigkeitsrucklaufkanal umgebenden, rohrstutzenför igen Abschnitt aufweist, auf dessen Außenumfang der Filtereinsatz dichtend aufsteckbar ist. Ein solcher rohrstutzenförmiger Abschnitt kann bei der Herstellung der Metallplatte problemlos einstückig angeformt werden, so daß hierdurch keine wesentlichen Herstellungskosten zusätzlich anfallen.Another measure for the simplest and therefore most cost-effective design of the liquid filter is that the metal plate has a pipe-socket-shaped section pointing into the filter housing and surrounding the liquid return channel, on the outer circumference of which the filter insert can be attached in a sealing manner. Such a pipe socket-shaped section can easily be integrally formed in the manufacture of the metal plate, so that no additional production costs are incurred as a result.
Um vor einem Wechsel des Filtereinsatzes die im Flüssigkeitsfilter befindliche Flüssigkeit kontrolliert ablassen zu können, kann umfangsseitig im Filtergehäuse und/ oder umfangs- oder stirnseitig im Deckel eine im Betrieb verschlossene, bedarfsweise freigebbare Flüssigkeitsab- laßöffnung zur Entleerung des Filtergehäuses vorgesehen sein. Wenn eine solche Flüssigkeitsablaßöffnung am Flüssigkeitsfilter vorgesehen ist, wird zweckmäßig zugleich die Ausführung des Flüssigkeitsfilters mit der in verschiedenen Winkelstellungen oder verdrehbar in das Filtergehäuse eingelegten Metallplatte verwendet, um bei der Montage des Flüssigkeitsfilters sicherzustellen, daß die Flüssigkeitsablaßoffnung an der tiefsten Stelle des montierten Flüssigkeitsfilters zu liegen kommt. Dabei spielt es keine Rolle, wie die Gewindegänge in der Metallplatte und am Gewindestutzen des Filteranschlußflan- sches verlaufen.In order to be able to drain the liquid in the liquid filter in a controlled manner before changing the filter insert, one can be in operation on the circumferential side in the filter housing and / or on the circumferential or front side in the cover a closed, if necessary releasable liquid drain opening can be provided for emptying the filter housing. If such a liquid drain opening is provided on the liquid filter, the design of the liquid filter with the metal plate inserted in various angular positions or rotatably in the filter housing is expediently used in order to ensure that the liquid drain opening lies at the lowest point of the mounted liquid filter when the liquid filter is installed comes. It does not matter how the threads in the metal plate and on the threaded connector of the filter connection flange run.
Drei Ausfuhrungsbeispiele der Erfindung werden im folgenden anhand einer Zeichnung erläutert. Die Figuren der Zeichnung zeigen:Three exemplary embodiments of the invention are explained below with reference to a drawing. The figures in the drawing show:
Figur 1 ein Flüssigkeitsfilter in einer ersten Ausführung im Längsschnitt,1 shows a liquid filter in a first embodiment in longitudinal section,
Figur 2 das Flüssigkeitsfilter in einer zweiten Ausführung, ebenfalls im Längsschnitt,FIG. 2 the liquid filter in a second embodiment, also in longitudinal section,
Figur 3 das Flüssigkeitsfilter in einer dritten Ausführung, ebenfalls im Längsschnitt, undFigure 3 shows the liquid filter in a third embodiment, also in longitudinal section, and
Figur 4 das Flüssigkeitsfilter aus Figur 3 im Querschnitt gemäß der Linie IV-IV in Figur 3.FIG. 4 shows the liquid filter from FIG. 3 in cross section along the line IV-IV in FIG. 3.
Figur 1 der Zeichnung zeigt als erstes Ausführungsbeispiel eines Flüssigkeitsfilters 1 ein "liegend", also mit im wesentlichen horizontaler Längsachse eingebautes Filter. Ganz links in Figur 1 ist ein Filteranschlußflansch 7 sichtbar, der integraler Bestandteil einer Brennkraftmaschine, insbesondere des Motorblocks der Brennkraftmaschine, ist. Die Ausführung dieses Filteran- schlußflansches 7 entspricht herkömmlichen Flanschausführungen, die an vielen Brennkraftmaschinen für die Anbringung von Anschraub-Wechselfilterpatronen vorhanden sind. Für die Anbringung des dargestellten Flüssigkeits- filters 1 muß der Filteranschlußflansch 7 nicht geändert werden, so daß das Flüssigkeitsfilter 1 als Ersatz für eine nur komplett austauschbare und damit eine erhebliche Müllmenge und Umweltbelastung darstellende Anschraub- Wechselfilterpatrone, auch als "Spin-on"-Filter bekannt, dienen kann.FIG. 1 of the drawing shows, as the first exemplary embodiment of a liquid filter 1, a "lying" filter, that is to say a filter installed with an essentially horizontal longitudinal axis. On the far left in FIG. 1, a filter connection flange 7 is visible, which is an integral part of an internal combustion engine, in particular the engine block of the internal combustion engine. The execution of this filter final flange 7 corresponds to conventional flange designs that are available on many internal combustion engines for the attachment of screw-on easy-change filter cartridges. For the attachment of the liquid filter 1 shown, the filter connection flange 7 does not have to be changed, so that the liquid filter 1 as a replacement for an exchangeable screw-on filter cartridge which is only completely replaceable and thus represents a considerable amount of waste and is environmentally harmful, also as a "spin-on" filter known, can serve.
Das Flüssigkeitsfilter 1 umfaßt ein Filtergehäuse 2, das durch einen Schraubdeckel 4 verschlossen ist. Im Inneren des Filtergehäuses 2 und des Deckels 4 liegt ein nach Abschrauben des Deckels 4 für sich auswechselbarer Filtereinsatz 5, der innenseitig durch einen Stützkörper 6 gegen die im Betrieb auftretenden Kräfte abgestützt ist.The liquid filter 1 comprises a filter housing 2, which is closed by a screw cap 4. Inside the filter housing 2 and the cover 4 there is a filter insert 5 which can be replaced after unscrewing the cover 4 and which is supported on the inside by a support body 6 against the forces occurring during operation.
Der radial äußere Teil des Filtergehauses 2 wird im Ausführungsbeispiel gemäß Figur 1 durch ein Spritzgußteil aus Kunststoff gebildet. Den an der Stirnseite 20 des Filtergehauses 2 liegenden Gehäusebereich bildet eine Metallplatte 3. Die Metallplatte 3 besteht vorzugsweise aus Stahl oder aus Druckgußaluminium. In ihrem zentralen Bereich besitzt die Metallplatte 3 eine Durchbrechung, die einen Flussigkeitsrucklaufkanal 34 für gereinigte Flüssigkeit bildet und die mit einem entsprechenden, dek- kungsgleich angeordneten Kanal innerhalb des Filteranschlußflansches 7 in Strömungsverbindung steht. Zur Zuführung von zu reinigender Flüssigkeit dienen mehrere Durchbrechungen 33 in der Metallplatte 3, die radial außen von der zentralen Durchbrechung 34 vorgesehen sind und die mit einem entsprechend verlaufenden Ringkanal im Filteranschlußflansch 7 in Strömungsverbindung stehen. Mit ihrem radial äußeren Randbereich 32 liegt die Metallplatte 3 auf einer Stufe nahe dem Stirnende des Filtergehauses 2 auf. Am Innenumfang der zentralen Durchbre- chung zur Bildung des Flüssigkeitsrücklaufkanals 34 besitzt die Metallplatte 3 ein Innengewinde 30. Zur Bildung ausreichend vieler Gewindegänge ist die Metallplatte 3 hier einstückig mit einem zum Inneren des Filtergehäuses 2 weisenden rohrstutzenförmigen Abschnitt 31 ausgebildet, der außenseitig eine glatte zylindrische Form aufweist und auf dessen Außenumfang der Filtereinsatz 5 dichtend aufgesteckt ist.The radially outer part of the filter housing 2 is formed in the exemplary embodiment according to FIG. 1 by an injection molded part made of plastic. A metal plate 3 forms the housing area lying on the end face 20 of the filter housing 2. The metal plate 3 is preferably made of steel or of die-cast aluminum. In its central area, the metal plate 3 has an opening which forms a liquid return channel 34 for cleaned liquid and which is in flow connection with a corresponding channel arranged in the same way within the filter connection flange 7. A plurality of openings 33 are provided in the metal plate 3 for supplying liquid to be cleaned, which openings are provided radially on the outside of the central opening 34 and are in flow connection with a correspondingly extending annular channel in the filter connection flange 7. With its radially outer edge region 32, the metal plate 3 rests on a step near the front end of the filter housing 2. On the inner circumference of the central opening In order to form the liquid return channel 34, the metal plate 3 has an internal thread 30. To form a sufficient number of threads, the metal plate 3 is formed here in one piece with a pipe socket-shaped section 31 pointing towards the inside of the filter housing 2, which has a smooth cylindrical shape on the outside and the outer circumference of which Filter insert 5 is attached sealingly.
Zur Abdichtung des Filtergehauses 2 gegen den Filteranschlußflansch 7 ist an der Stirnseite 20 des Filtergehäuses 2 eine umlaufende Nut 21 vorgesehen, in die ein Dichtring 22, vorzugsweise ein Elastomer-O-Ring, eingelegt ist. Die für die Abdichtung erforderliche axiale Anpreßkraft wird durch Verschrauben der Metallplatte 3 mit einem Gewindestutzen 70 des Filteranschlußflansches 7 bewirkt.To seal the filter housing 2 against the filter connection flange 7, a circumferential groove 21 is provided on the end face 20 of the filter housing 2, into which a sealing ring 22, preferably an elastomer O-ring, is inserted. The axial contact pressure required for the sealing is brought about by screwing the metal plate 3 to a threaded connector 70 of the filter connection flange 7.
Weiterhin zeigt das Ausführungsbeispiel des Flüssigkeitsfilters 1 gemäß Figur 1 an der nach unten weisenden Seite des Filtergehäuses 2 eine Flüssigkeitsablaßoffnung 25, die im Normalbetrieb des Flüssigkeitsfilters 1 durch eine Schraube 26 dicht verschlossen ist. Geöffnet wird die Flüssigkeitsablaßoffnung 25 in der Regel nur vor einem Filtereinsatzwechsel , um das Innere des Flüssigkeits- filters 1 leerlaufen zu lassen, wobei das Leerlaufen gezielt und kontrolliert durch die Flüssigkeitsablaßoff- nung 25 erfolgt. Beim Filtereinsatzwechsel wird dann ein praktisch flüssigkeitsfreier Filtereinsatz 5 aus dem Flüssigkeitsfilter 1 entnommen und durch einen frischen Filtereinsatz 5 ersetzt.Furthermore, the embodiment of the liquid filter 1 according to FIG. 1 shows a liquid drain opening 25 on the downward-facing side of the filter housing 2, which is closed tightly by a screw 26 during normal operation of the liquid filter 1. As a rule, the liquid drain opening 25 is opened only before a filter insert change in order to let the interior of the liquid filter 1 run empty, the empty running taking place in a targeted and controlled manner through the liquid drain opening 25. When changing the filter insert, a practically liquid-free filter insert 5 is then removed from the liquid filter 1 and replaced by a fresh filter insert 5.
Um die Flüssigkeitsablaßöffnung 25 an der tiefsten Stelle des montierten Filtergehäuses 2 zu positionieren, ist die Metallplatte 3 bei diesem Ausführungsbeispiel lose und relativ zum Filtergehäuse 2 verdrehbar in dieses eingelegt. Somit kann bei Anbringung des Filtergehäuses 2 am Filteranschlußflansch 7 zunächst das Filtergehäuse 2 in der richtigen Lage, d.h. mit nach unten weisender Flüssigkeitsablaßoffnung 25, auf dem Filteranschlußflansch 7 positioniert und dann durch Festschrauben der Metallplatte 3 in dieser Stellung fixiert werden. Dabei können die Durchbrechungen 33 in der Metallplatte 3 vorteilhaft zum Eingreifen eines Schraubwerkzeuges genutzt werden, um das erforderliche Drehmoment problemlos in die Metallplatte 3 einbringen zu können. Die Metallplatte 3 drückt mit ihrem radial äußeren Bereich 32 rein in Axialrichtung auf den zwischen der Metallplatte 3 und dem Filteranschlußflansch 7 liegenden Teil des Filtergehäuses 2, in dem sich die Dichtung 22 befindet. Auf diese Weise kann für das Filtergehäuse 2 ein relativ leichtes und damit auch kostengünstiges Material eingesetzt werden, vorzugsweise ein Kunststoff, wie z.B. Polyamid, oder ein besonders leichtes Leichtmetall, wie Magnesium.In order to position the liquid discharge opening 25 at the deepest point of the assembled filter housing 2, the metal plate 3 in this exemplary embodiment is inserted loosely and rotatable relative to the filter housing 2. Thus, when attaching the filter housing 2 on the filter connection flange 7, first the filter housing 2 in the correct position, ie with the liquid drain opening 25 pointing downwards, positioned on the filter connection flange 7 and then fixed in this position by screwing the metal plate 3 tight. The openings 33 in the metal plate 3 can advantageously be used to engage a screwing tool in order to be able to introduce the required torque into the metal plate 3 without problems. With its radially outer region 32, the metal plate 3 presses purely in the axial direction on the part of the filter housing 2 between the metal plate 3 and the filter connection flange 7 in which the seal 22 is located. In this way, a relatively light and therefore also inexpensive material can be used for the filter housing 2, preferably a plastic, such as polyamide, or a particularly light light metal, such as magnesium.
Das Ausführungsbeispiel gemäß Figur 2 entspricht in weiten Teilen dem Ausführungsbeispiel gemäß Figur 1 und es wird deshalb hinsichtlich der im folgenden nicht nochmals erwähnten Bezugsziffern auf die Beschreibung der Figur 1 verwiesen. Unterschiedlich ist bei dem Ausführungsbeispiel des Flüssigkeitsfilters 1 gemäß Figur 2, daß hier keine Flüssigkeitsablaßoffnung vorgesehen ist. Aus diesem Grunde ist es auch nicht erforderlich, daß die Metallplatte 3 relativ zum Filtergehäuse 2 verdrehbar ist. Deshalb ist bei dem Ausführungsbeispiel gemäß Figur 2 die Metallplatte 3 an ihrem Außenumfangsbereich 32 in das Material des übrigen Filtergehäuses 2 eingebettet, insbesondere eingespritzt. Damit besteht die Möglichkeit, das Flüssigkeitsfilter 1 gemäß Figur 2 komplett vorzumontieren und dann im komplett vormontierten Zustand an dem Filteranschlußflansch 7 anzuschrauben, wie dies von herkömmlichen Anschraub-Wechselfilterpatro- nen bekannt ist. Figur 3 der Zeichnung zeigt ein Ausführungsbeispiel eines Flüssigkeitsfilters 1 in einer stehenden Ausführung. Auch hier besitzt das Flüssigkeitsfilter 1 ein Gehäuse 2 mit einem Schraubdeckel 4. Im Inneren des Flüssigkeits- filters 1 ist ein Filtereinsatz 5 angeordnet, der innenseitig durch einen Stützkörper 6 stabilisiert ist.The exemplary embodiment according to FIG. 2 largely corresponds to the exemplary embodiment according to FIG. 1, and reference is therefore made to the description of FIG. 1 with regard to the reference numbers not mentioned again below. The difference in the embodiment of the liquid filter 1 according to FIG. 2 is that no liquid drain opening is provided here. For this reason, it is also not necessary for the metal plate 3 to be rotatable relative to the filter housing 2. Therefore, in the exemplary embodiment according to FIG. 2, the metal plate 3 is embedded, in particular injected, in the material of the remaining filter housing 2 on its outer peripheral region 32. There is thus the possibility of completely pre-assembling the liquid filter 1 according to FIG. 2 and then screwing it onto the filter connection flange 7 in the completely pre-assembled state, as is known from conventional screw-on replaceable filter cartridges. Figure 3 of the drawing shows an embodiment of a liquid filter 1 in a standing version. Here, too, the liquid filter 1 has a housing 2 with a screw cap 4. A filter insert 5 is arranged inside the liquid filter 1 and is stabilized on the inside by a support body 6.
Die hier nach unten weisende Stirnseite 20 des Filtergehäuses 2 wird auch hier durch eine Metallplatte 3 gebildet, die im wesentlichen mit den Metallplatten 3 der Flüssigkeitsfilter gemäß den Figuren 1 und 2 identisch ausgeführt ist. Ein Unterschied in der Gestaltung der Metallplatte 3 gemäß Figur 3 besteht darin, daß hier die Durchbrechungen 33, die den Flüssigkeitszulaufkanal bilden, durch ausgestanzte und in Axialrichtung nach außen, in der Zeichnung nach unten, gebogene Laschen 35 gebildet sind. Die Durchbrechungen 33 liegen relativ weit außen in der Metallplatte 3. Die Biegelinie der nach unten abgebogenen Laschen 35 liegt unmittelbar vor dem radial äußeren Randbereich 32 der Metallplatte 3.The face 20 of the filter housing 2, which faces downward here, is also formed here by a metal plate 3, which is essentially identical to the metal plates 3 of the liquid filters according to FIGS. 1 and 2. A difference in the design of the metal plate 3 according to FIG. 3 is that here the openings 33, which form the liquid inlet channel, are formed by punched tabs 35 which are bent outwards in the axial direction, downwards in the drawing. The openings 33 are located relatively far outward in the metal plate 3. The bending line of the tabs 35 bent downward lies directly in front of the radially outer edge region 32 of the metal plate 3.
Die axial äußere, in der Zeichnung nach unten weisende Stirnfläche 37 jeder Lasche 35 liegt im Verlauf und in der Ebene der flanschseitigen Stirnfläche 27 des Filtergehäuses 2. Weiterhin ist in der Stirnfläche 27 eine umlaufende Nut 21 mit einem darin eingelegten Dichting 22 angebracht, wie auch schon bei den Flüssigkeitsfiltern 1 gemäß den Figuren 1 und 2. Der Vorteil dieser Ausgestaltung der Metallplatte 3 besteht darin, daß im montierten Zustand des Flüssigkeitsfilters 1, wie ihn die Figur 3 zeigt, die axial nach außen weisenden Stirnflächen 37 der metallischen Laschen 35 unmittelbar auf dem ebenfalls metallischen Filteranschlußflansch 7 aufstehen. Dies erlaubt die Verwendung von weniger stabilem und relaxierendem Material, z.B. Kunststoff, für das Filtergehäuse 2. Darin auftretende Relaxationsvorgänge haben dann für die Sicherheit und Dichtigkeit der Verbindung des Flüssigkeitsfilters 1 mit dem Filteranschlußflansch 7 keine negativen Folgen.The axially outer, in the drawing facing end face 37 of each tab 35 lies in the course and in the plane of the flange-side end face 27 of the filter housing 2. Furthermore, a circumferential groove 21 with a sealing 22 inserted therein is made in the end face 27, as well even with the liquid filters 1 according to FIGS. 1 and 2. The advantage of this embodiment of the metal plate 3 is that in the assembled state of the liquid filter 1, as shown in FIG. 3, the axially outward-facing end faces 37 of the metallic tabs 35 directly open stand up also metallic filter connection flange 7. This allows the use of less stable and relaxing material, for example plastic, for the filter housing 2. Relaxation processes occurring therein then have for the security and tightness of the connection of the liquid filter 1 with the filter connection flange 7 no negative consequences.
Die Anpreßkraft zur Halterung und Abdichtung des Flüssig- keitεfilters 1 wird auch hier durch den radial äußeren Randbereich 32 der Metallplatte 3 aufgebracht, wobei der radial äußere Randbereich 32 hinter der Ringnut 21 und dem darin eingelegten Dichtring 22 liegt.The contact pressure for holding and sealing the liquid filter 1 is also applied here by the radially outer edge region 32 of the metal plate 3, the radially outer edge region 32 being behind the annular groove 21 and the sealing ring 22 inserted therein.
Die Metallplatte 3 besitzt auch hier eine zentrale Durchbrechung 34, die den Flussigkeitsrucklaufkanal bildet. In diesem Bereich besitzt die Metallplatte 3 einen axial nach innen weisenden rohrstutzenförmigen Abschnitt 31, auf den der Filtereinsatz 5 aufgesteckt ist. Innen besitzt dieser Abschnitt 31 der Metallplatte 3 ein Innengewinde, das hier wieder mit einem Gewindestutzen 70 des Filteranschlußflansches 7 verschraubt ist.The metal plate 3 also has a central opening 34 here, which forms the liquid return channel. In this area, the metal plate 3 has an axially inwardly directed pipe socket-shaped section 31, onto which the filter insert 5 is attached. Inside, this section 31 of the metal plate 3 has an internal thread, which is screwed here again with a threaded connector 70 of the filter connection flange 7.
Figur 4 der Zeichnung zeigt das Flüssigkeitsfilter 1 aus Figur 1 im Schnitt entlang der Linie IV - IV. Ganz im Zentrum von Figur 4 ist der Gewindestutzen 70 des Filteranschlußflansches 7 sichtbar. Außen um diesen herum liegt der rohrstutzenförmige Abschnitt 31 der Metallplatte 3. Nach außen erstreckt sich dann die Metallplatte 3 bis zu ihrem radial äußeren Randbereich 32. Ganz außen ist schließlich das Filtergehäuse 2 geschnitten.FIG. 4 of the drawing shows the liquid filter 1 from FIG. 1 in section along the line IV-IV. The threaded connector 70 of the filter connecting flange 7 is visible in the very center of FIG. The pipe socket-shaped section 31 of the metal plate 3 is located around the outside thereof. The metal plate 3 then extends outward to its radially outer edge region 32. The filter housing 2 is finally cut out at the very outside.
Wie die Figur 4 weiter zeigt, sind hier insgesamt acht Laschen 35 und entsprechend acht Durchbrechungen 33 vorgesehen, die in einem regelmäßigen Winkelabstand über den Umfang verteilt angebracht sind. Die nach unten weisenden Laschen 35 liegen in entsprechenden Aussparungen im unteren Stirnendbereich des Filtergehauses 2, so daß die Metallplatte 3 in insgesamt acht unterschiedlichen Winkelstellungen in das Filtergehäuse 2 eingesetzt werden kann, wobei eine Verdrehbarkeit zwischen Metallplatte 3 und Filtergehäuse 2 aber unterbunden ist. Das Flüs- sigkeitεfilter 1 kann also komplett vormontiert werden und dann als komplette Einheit auf den Filteranschlußflansch 7 aufgeschraubt werden.As FIG. 4 further shows, a total of eight tabs 35 and eight openings 33 are provided, which are distributed at a regular angular distance over the circumference. The downward-facing tabs 35 are located in corresponding recesses in the lower end region of the filter housing 2, so that the metal plate 3 can be inserted into the filter housing 2 in a total of eight different angular positions, but rotatability between the metal plate 3 and the filter housing 2 is prevented. The river sigkeitεfilter 1 can thus be completely pre-assembled and then screwed onto the filter connection flange 7 as a complete unit.
Außer, wie in den Figuren 1 und 2 gezeigt, aus Kunststoff, kann der nicht von der Metallplatte 3 gebildete Teil des Filtergehauses 2 auch durch ein Leichtmetall, wie Magnesium oder Aluminium, gebildet sein, die beide im Druckgußverfahren verarbeitbar sind.Apart from, as shown in FIGS. 1 and 2, made of plastic, the part of the filter housing 2 which is not formed by the metal plate 3 can also be formed by a light metal, such as magnesium or aluminum, both of which can be processed by the die-casting process.
Aus den Zeichnungsfiguren ist augenfällig ersichtlich, daß die Metallplatte 3 und der übrige Teil des Filtergehäuses 2 relativ einfache Teile sind, die mit vorteilhaft geringen Herstellungskosten und im Idealfall werkzeugfallend und damit besonders wirtschaftlich herstellbar sind.From the drawing figures it is evident that the metal plate 3 and the remaining part of the filter housing 2 are relatively simple parts that can be produced advantageously with low manufacturing costs and ideally with tools and thus particularly economically.
Die Flüssigkeitsfilter 1 gemäß den Figuren 1 bis 4 können, was hier nicht eigens dargestellt ist, mit weiteren technischen Elementen ausgestattet sein, die bei derartigen Flüssigkeitsfiltern gebräuchlich sind, wie Rücklaufsperrventile oder -membranen in den Kanälen 33 und/oder 34 oder ein Bypass-Ventil zwischen Rohseite und Reinseite des Filters 1. The liquid filter 1 according to FIGS. 1 to 4 can, which is not specifically shown here, be equipped with further technical elements that are common in such liquid filters, such as non-return valves or membranes in the channels 33 and / or 34 or a bypass valve between raw side and clean side of filter 1.

Claims

Patentansprüche :Claims:
Flüssigkeitsfilter, insbesondere für Kraftstoff oder Öl einer Brennkraftmaschine, wobei das Flüssigkeits- filter (1) ein Filtergehäuse (2) mit mindestens je einem Flüssigkeitszulauf- und Flussigkeitsrucklaufkanal (33, 34), einen das Filtergehäuse (2) flüssigkeitsdicht verschließenden, lösbaren Deckel (4) und einen austauschbaren Filtereinsatz (5) umfaßt und wobei das Flüssigkeitsfilter (1) dichtend mit einem Filteranschlußflansch (7), z.B. einer Brennkraftmaschine, verschraubbar ist, wozu an der im montierten Zustand dem Filteranschlußflansch (7) zugewandten Stirnseite (20) des Filtergehauses (2) ein Schraubbefestigungselement (3) angeordnet ist, das eine zentrale, den Flussigkeitsrucklaufkanal (34) bildende Durchbrechung mit einem mit einem Gewindestutzen (70) des Filteranschlußflansches (7) verschraubbaren Innengewinde (30) aufweist, d a d u r c h g e k e n n z e i c h n e t,Liquid filter, in particular for fuel or oil of an internal combustion engine, the liquid filter (1) comprising a filter housing (2) with at least one liquid inlet and liquid return channel (33, 34), a detachable cover (4) which seals the filter housing (2) in a liquid-tight manner ) and an exchangeable filter insert (5) and wherein the liquid filter (1) sealingly with a filter connection flange (7), for example An internal combustion engine can be screwed, for which purpose a screw fastening element (3) is arranged on the end face (20) of the filter housing (2) facing the filter connection flange (7) in the assembled state, said screw fastening element (3) forming a central opening with a liquid return channel (34) with a Has threaded connector (70) of the filter connection flange (7) screwable internal thread (30), characterized in that
- daß das Filtergehäuse (2) ein Kunststoff-Spritzguß- teil oder ein Leichtmetall-Druckgußteil ist,- That the filter housing (2) is a plastic injection molded part or a light metal die-cast part,
- daß das Schraubbefestigungselement (3) eine Metallplatte ist, die den flächenmäßig überwiegenden Teil der Stirnseite (20) des Filtergehäuses (2) bildet und- That the screw fastening element (3) is a metal plate which forms the predominantly area of the end face (20) of the filter housing (2) and
- daß die Metallplatte (3) im montierten Zustand des Filters (1) mit ihrem radial äußeren Bereich (32) das Filtergehäuse (2) hintergreift und eine radial äußere Filtergehäusestirnfläche (27) axial an den Filteranschlußflansch (7) anpreßt. - That the metal plate (3) in the assembled state of the filter (1) with its radially outer region (32) engages behind the filter housing (2) and axially presses a radially outer filter housing end face (27) onto the filter connection flange (7).
2. Flüssigkeitsfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Metallplatte (3) ein werkzeugfallendes Stanz-, Präge- und/oder Tiefziehteil aus Stahlblech oder ein werkzeugfallendes Druckgußteil aus Druckgußaluminium ist.2. Liquid filter according to claim 1, characterized in that the metal plate (3) is a die-cutting, embossing and / or deep-drawing part made of sheet steel or a die-cast aluminum die-cast part.
3. Flüssigkeitsfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Metallplatte (3) unverlierbar im übrigen Filtergehäuse (2) gehaltert ist.3. Liquid filter according to claim 1 or 2, characterized in that the metal plate (3) is captively held in the remaining filter housing (2).
4. Flüssigkeitsfilter nach Anspruch 3, dadurch gekennzeichnet, daß die Metallplatte (3) in das übrige Filtergehäuse (2) eingespritzt oder eingegossen ist.4. Liquid filter according to claim 3, characterized in that the metal plate (3) in the remaining filter housing (2) is injected or cast.
5. Flüssigkeitsfilter nach Anspruch 3, dadurch gekennzeichnet, daß die Metallplatte (3) einen nicht-kreisförmigen, vorzugsweise einen mehrkantigen oder gezahnten, Außenumfang aufweist und in das übrige Filtergehäuse (2) im Preßsitz oder Formschluß und somit unverdrehbar eingesetzt ist.5. Liquid filter according to claim 3, characterized in that the metal plate (3) has a non-circular, preferably a polygonal or serrated, outer circumference and is inserted into the remaining filter housing (2) in a press fit or form fit and thus non-rotatably.
6. Flüssigkeitsfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Metallplatte (3) einen im wesentlichen kreisförmigen Außenumfang aufweist und in das übrige Filtergehäuse (2) lose und relativ zu diesem verdrehbar eingesetzt ist.6. Liquid filter according to claim 1 or 2, characterized in that the metal plate (3) has a substantially circular outer periphery and is loosely inserted in the remaining filter housing (2) and rotatable relative thereto.
7. Flüssigkeitsfilter nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Metallplatte (3) außerhalb ihres Zentrums im Abstand von dem zentralen Flussigkeitsrucklaufkanal (34) wenigstens eine Durchbrechung (33) aufweist, die den Flüssig- keitszulaufkanal bildet.7. Liquid filter according to one of the preceding claims, characterized in that the metal plate (3) outside its center at a distance from the central liquid return channel (34) has at least one opening (33) which forms the liquid inlet channel.
8. Flüssigkeitsfilter nach Anspruch 7, dadurch gekennzeichnet, daß die Metallplatte (3) mehrere gleichmäßig in Umfangsrichtung verteilt auf einer Kreislinie angeordnete Durchbrechungen (33) aufweist.8. Liquid filter according to claim 7, characterized in that the metal plate (3) several evenly distributed in the circumferential direction on a circular line has arranged openings (33).
9. Flüssigkeitsfilter nach Anspruch 8, dadurch gekennzeichnet, daß die Durchbrechungen (33) durch aus der Metallplatte (3) axial nach außen gebogene Laschen9. Liquid filter according to claim 8, characterized in that the openings (33) by axially bent outwardly from the metal plate (3) tabs
(35) gebildet sind, deren axial äußere Stirnenden (37) im Verlauf und in der Ebene der flanschseiti- gen, radial äußeren Stirnfläche (27) des Filtergehäuses (2) liegen.(35) are formed, the axially outer end faces (37) of which lie in the course and in the plane of the flange-side, radially outer end face (27) of the filter housing (2).
10. Flüssigkeitsfilter nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die flanschsei- tige, radial äußere Stirnfläche (27) des Filtergehauses (2) in ihrem gespritzten oder gegossenen Teil mit einer Dichtkontur, vorzugsweise mit einer Dichtlippe, versehen ist, wobei in montiertem Zustand des Flüssigkeitsfilters (1) die Stirnfläche (27) mit der Dichtkontur dichtend am Filteranschlußflansch (7) anliegt.10. Liquid filter according to one of the preceding claims, characterized in that the flange-side, radially outer end face (27) of the filter housing (2) in its injection-molded or cast part is provided with a sealing contour, preferably with a sealing lip, in which mounted Condition of the liquid filter (1), the end face (27) with the sealing contour lies sealingly against the filter connection flange (7).
11. Flüssigkeitsfilter nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß eine Dichtung (22) zwischen dem Filteranschlußflansch (7) und der flansch- seitigen, radial äußeren Stirnfläche (27) des Filtergehäuses (2) vorgesehen ist, wobei vorzugsweise in der radial äußeren Stirnfläche (27) eine Ringnut11. Liquid filter according to one of claims 1 to 9, characterized in that a seal (22) between the filter connection flange (7) and the flange-side, radially outer end face (27) of the filter housing (2) is provided, preferably in the radially outer end face (27) an annular groove
(21) zur Aufnahme eines Dichtrings als Dichtung (22) vorgesehen ist, wobei der Dichtring (22) in entspanntem Zustand in Axialrichtung des Filtergehäuses (2) aus der Nut (21) vorsteht und in montiertem Zustand des Flüssigkeitsfilters (1) unter elastischer Verformung vollständig innerhalb der Ringnut (21) liegt.(21) is provided for receiving a sealing ring as a seal (22), the sealing ring (22) protruding from the groove (21) in the axial direction of the filter housing (2) in the relaxed state and in the assembled state of the liquid filter (1) with elastic deformation lies completely within the annular groove (21).
12. Flüssigkeitsfilter nach Anspruch 11, dadurch gekennzeichnet, daß der Außendurchmesser der Metallplatte (3) mindestens so groß ist wie der Außendurchmesser der Ringnut (21) und daß der radial äußere Bereich (32) der Metallplatte (3) in Filter-Axialrichtung gesehen hinter der Ringnut (21) liegt.12. Liquid filter according to claim 11, characterized in that the outer diameter of the metal plate (3) is at least as large as the outer diameter of the annular groove (21) and that the radially outer region (32) of the metal plate (3) seen in the filter axial direction lies behind the annular groove (21).
13. Flüssigkeitsfilter nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Metallplatte (3) einen in das Filtergehäuse (2) weisenden, den Flussigkeitsrucklaufkanal (34) umgebenden, rohrstut- zenförmigen Abschnitt (31) aufweist, auf dessen Außenumfang der Filtereinsatz (5) dichtend aufsteckbar ist.13. Liquid filter according to one of the preceding claims, characterized in that the metal plate (3) in the filter housing (2) facing, the liquid return channel (34) surrounding, pipe socket-shaped section (31), on the outer circumference of the filter insert (5th ) can be plugged on in a sealing manner.
14. Flüssigkeitsfilter nach einem der Ansprüche 6 bis14. Liquid filter according to one of claims 6 to
13, dadurch gekennzeichnet, daß u fangsseitig im Filtergehäuse (2) und/oder umfangs- oder stirnseitig im Deckel (4) eine im Betrieb verschlossene, bedarfsweise freigebbare Flüssigkeitsablaßoffnung (25) zur Entleerung des Filtergehäuses (2) vorgesehen ist. 13, characterized in that u on the start side in the filter housing (2) and / or on the circumferential or front side in the cover (4) a liquid discharge opening (25) which is closed during operation and can be released if necessary is provided for emptying the filter housing (2).
PCT/EP2000/008993 1999-09-14 2000-09-14 Filter for liquids WO2001019491A1 (en)

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