DE202005013908U1 - Filtration arrangement for hydraulic oil, which is located in return line from user device includes a coarse filter primary element and a fine particulates and moisture retaining element connected as a by-pass to the main element - Google Patents
Filtration arrangement for hydraulic oil, which is located in return line from user device includes a coarse filter primary element and a fine particulates and moisture retaining element connected as a by-pass to the main element Download PDFInfo
- Publication number
- DE202005013908U1 DE202005013908U1 DE202005013908U DE202005013908U DE202005013908U1 DE 202005013908 U1 DE202005013908 U1 DE 202005013908U1 DE 202005013908 U DE202005013908 U DE 202005013908U DE 202005013908 U DE202005013908 U DE 202005013908U DE 202005013908 U1 DE202005013908 U1 DE 202005013908U1
- Authority
- DE
- Germany
- Prior art keywords
- filter
- hydraulic oil
- hydraulic
- main
- bypass
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 35
- 238000001914 filtration Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- 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
- B01D29/23—Supported filter elements arranged for outward flow filtration
-
- 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
- B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
- B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—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 multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
-
- 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
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0276—Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs
-
- 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
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/157—Flow control valves: Damping or calibrated passages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Filtern von Hydrauliköl nach dem Oberbegriff des Anspruchs 1.The The invention relates to a device for filtering hydraulic oil after Preamble of claim 1.
Hydraulikzylinder werden in der Technik sehr vielfältig verwendet. So werden sie beispielsweise im Bereich der Baumaschinen eingesetzt. Da in Baumaschinen, beispielsweise Hydraulikbaggern, eine Vielzahl von Hydraulikzylindern zur Bewegung des Hydraulikbaggers vorgesehen sind, ist dort ein zentraler Hydrauliktank vorgesehen, in welchem das Hydrauliköl, mit welchem die Hydraulikzylinder beaufschlagt werden, gesammelt werden kann. Bei einem Arbeitsspiel der Ausrüstung des Hydraulikbaggers wird das Hydrauliköl aus dem Hydrauliktank in die Hydraulikzylinder gepumpt. Beim Ausfahren der Hydraulikzylinder über die Kolbenflächen wird mehr Öl aus dem Hydrauliktank gepumpt, als über die Zylinderringseite zurückfließt. Entsprechend dieser Differenzmenge wird über ein am Hydrauliktank angeordnete Belüftungsfilter Außenluft in den Hydrauliktank angesaugt.hydraulic cylinders become very diverse in technology used. This is how they become, for example, in the field of construction machinery used. Since in construction machinery, for example hydraulic excavators, a plurality of hydraulic cylinders for moving the hydraulic excavator are provided, a central hydraulic tank is provided there, in which the hydraulic oil, with which the hydraulic cylinders are applied, collected can be. At a working cycle of the equipment of the hydraulic excavator becomes the hydraulic oil pumped from the hydraulic tank into the hydraulic cylinder. When extending the hydraulic cylinder over the piston surfaces gets more oil pumped out of the hydraulic tank than flows back over the cylinder ring side. Corresponding this difference is over a ventilation filter located on the hydraulic tank, external air sucked into the hydraulic tank.
Das aus den Hydraulikzylindern zurückfließende Hydrauliköl gelangt über einen Rücklauffilter in den Reinraum des Hydrauliktanks. Diese Rücklauffilter dienen da zu, gröbere Verunreinigungen aus dem Hydrauliköl auzufiltern. Die Rücklauffilter sind aber üblicherweise so ausgelegt, dass nur vergleichsweise grobe Partikel im Filter zurückgehalten werden. Feine Partikel und insbesondere im Hydrauliköl gelöstes Wasser können nicht zurückgehalten werden.The Hydraulic oil returning from the hydraulic cylinders passes via a Return filter in the clean room of the hydraulic tank. These return filters serve as, coarser impurities from the hydraulic oil auzufiltern. The return filters but they are usually designed so that only comparatively coarse particles in the filter be withheld. Fine particles and especially water dissolved in the hydraulic oil can not be withheld.
Die aufgrund der vorgenannten Differenzmenge des umgepumpten Hydrauliköls in den Hydrauliktank angesaugte Außenluft hat je nach Umgebungs- und Witterungszuständen eine bestimmte Luftfeuchtigkeit. Über die Kolbenstangen der Hydraulikzylinder kann ebenfalls Feuchtigkeit in das Hydrauliköl gelangen.The due to the aforementioned difference amount of the pumped hydraulic oil in the Hydraulic tank sucked outside air Depending on the ambient and weather conditions has a certain humidity. About the Piston rods of the hydraulic cylinder can also be moisture into the hydraulic oil reach.
Bei Hydraulikbaggern werden aus Umweltschutzgründen immer stärker biologisch abbaubare Hydrauliköle eingesetzt. Diese Hydrauliköle haben aber den Nachteil, dass sie sehr stark hygroskopisch sind. Das Wasser im Hydrauliköl führt zu Korrosions- und Kavitationsschäden an den Hydraulikkomponenten.at Hydraulic excavators are becoming increasingly bio-friendly for environmental reasons degradable hydraulic oils used. These hydraulic oils but have the disadvantage that they are very strong hygroscopic. The water in the hydraulic oil leads to Corrosion and cavitation damage on the hydraulic components.
Zur Vermeidung entsprechender Schäden müssen bei Verwendung von biologischabbaubaren Hydraulikölen zusätzliche Filter eingebaut werden, die die nicht im Öl gelösten Wasseranteile herausfiltern. Diese Filter werden üblicherweise als separate komplette Aggregate in den Hydraulikkreislauf eingebaut. Sie werden im Nebenstrom betrieben. Hierzu wird das Hydrauliköl aus Steuerblock dem Steuerblock des Baggers ausgespeist, zum Nebenstromfilter geleitet und von dort zurück in den Tank geführt. Nachteilig ist es, dass diese separaten Nebenstromfilter getrennt auf den Bagger aufgebaut werden müssen und mit dem Hydrauliksystem verschlaucht werden müssen. Sie benötigen also einen leicht zugänglichen Platz auf dem Oberwagen des Baggers. Es sind weiterhin getrennte Befestigungsvorrichtungen vorzusehen und es muss genügend Platz zum Zuführen und Abführen bzw. zum Befestigen der Hydraulikschläuche vorgesehen werden.to Avoidance of corresponding damage must be included Use of biodegradable hydraulic oils to install additional filters not in the oil dissolved Filter out water. These filters are usually installed as separate complete units in the hydraulic circuit. They are operated in the secondary flow. For this purpose, the hydraulic oil from the control block fed to the control block of the excavator, passed to the bypass filter and back from there led into the tank. adversely It is that these separate sidestream filters are separated on the excavator must be built and have to be hosed with the hydraulic system. she need So an easily accessible Space on the uppercarriage of the excavator. They are still separate Provide fastening devices and there must be enough space for feeding and discharge or for securing the hydraulic hoses are provided.
Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung zum Filtern von Hydrauliköl zu schaffen, mit denen nicht nur die gröberen Teilchen vom Hydrauliköl getrennt werden können, sondern mit dem auch feinere Teilchen und Wasser aus dem Hydrauliköl entfernt werden kann.task It is the object of the present invention to provide a device for filtering of hydraulic oil to create, with which not only the coarser particles separated from the hydraulic oil can be but with the finer particles and water removed from the hydraulic oil can be.
Erfindungsgemäß ist diese Aufgabe durch die Kombination der Merkmale des Anspruchs 1 gelöst. Demnach ist eine Vorrichtung zum Filtern von Hydrauliköl mit einem von einem Trägerrohr getragenen Hauptfilter versehen, durch den der Rücklaufstrom von eingesetztem Hydrauliköl geführt und gefiltert wird. In dem Hauptfilter ist ein Nebenstromfilter mit Wasseraufnahmeeigenschaft integriert, wobei diesem Nebenstromfilter Hydrauliköl vom Hauptfilter im Nebenstrom zuführbar ist.According to the invention this is Problem solved by the combination of the features of claim 1. Therefore is a device for filtering hydraulic oil with one of a carrier tube provided main filter through which the return flow of inserted hydraulic oil guided and filtered. In the main filter is a bypass filter with Integrated water absorption feature, this bypass filter hydraulic oil from the main filter in the secondary stream can be fed.
Vorteilhaft ist aufgrund dieser Lösung kein separates Filtergehäuse für den Nebenstromfilter mehr notwendig. Es sind keine zusätzlichen externern Installationen für einen getrennten Nebenstromfilter vorzunehmen. Damit entfallen auch zusätzliche Teile zur Filterbefestigung des Nebenstromfilters und die Montagezeit verkürzt sich entsprechend. Die hierdurch bedingte Kosteneinsparung führt insgesamt zu moderaten Gesamtkosten des Filterelements, die sich in einer verbesserten Kundenakzeptanz niederschlägt.Advantageous is because of this solution no separate filter housing for the Secondary flow filter more necessary. There are no additional ones external installations for to make a separate bypass filter. This also eliminates additional parts for filter attachment of the bypass filter and the installation time shortened accordingly. The resulting cost savings overall at a moderate total cost of the filter element, resulting in a improved customer acceptance.
Bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.preferred Embodiments of the invention will become apparent from the main claim subsequent Dependent claims.
Demnach kann die Anströmung des Nebenstromfilters über eine in das Trägerrohr des Hauptfilters eintauchende Zuführleitung erfolgen.Therefore can the flow of the bypass filter over one in the carrier tube the main filter immersed supply line done.
In der Zuführleitung kann mindestens eine Bohrung bzw. Drossel zur Dosierung des Nebenstromvolumenstroms vorhanden sein.In the supply line can at least one bore or throttle for dosing the bypass flow to be available.
Besonders vorteilhaft weist die Zuführleitung eine in das Trägerrohr hineinragende erste Bohrung bzw. Drossel zur Aufnahme des Hydrauliköls und eine in den Nebenstromfilter hineinragende zweite Bohrung bzw. Drossel auf, wobei die Bohrungs- bzw. Drosselquerschnitte so aufeinander abgestimmt sind, dass im Nebenstromfilter immer eine ausreichende Versorgung mit Hydrauliköl gewährleistet ist. Gemäß dieser Lösung ist also aufgrund der Abstimmung der Bohrungsquerschnitte gewährleistet, dass bei schlechtesten Verhältnissen immer noch ein ausreichender Nebenstrom zum Feinstfilterelement geleitet wird. Die Bohrungen bzw. Drosselquerschnitte sind dabei so aufeinander abgestimmt, dass die für die Versorgung des Nebenstromfilters notwendigen Druckverhältnisse zwischen Hauptfilterstrom und Nebenstrom zur Versorgung des Nebenstromfilters realisiert sind.Particularly advantageously, the feed line projecting into the support tube first bore or throttle for receiving the hydraulic oil and a projecting into the bypass filter second bore or throttle, wherein the bore or throttle cross-sections are coordinated so that always in the bypass filter out a supply of hydraulic oil is guaranteed. According to this solution, it is therefore ensured due to the coordination of the bore cross-sections that in the worst case conditions, a sufficient sidestream is still conducted to the ultrafine filter element. The bores or throttle cross-sections are matched to one another in such a way that the pressure ratios necessary between the main filter flow and the secondary flow for supplying the bypass filter are met to supply the bypass filter.
Besonders vorteilhaft kann im Nebenstromfilter ein Sensor zur Anzeige der Filterbeladung vorgesehen sein. Über diesen Sensor ist die Filterbeladung und damit das Wechselintervall registrierbar. Dieser Sensor kann vorteilhaft ein Drucksensor oder Manometer sein.Especially Advantageously, in the bypass filter, a sensor for displaying the Filter loading be provided. about This sensor is the filter load and thus the change interval registerable. This sensor can advantageously be a pressure sensor or manometer be.
Eine vorteilhafte Ausführungsvariante der vorliegenden Erfindung besteht darin, dass der Hauptfilter mit integriertem Nebenstromfilter modular aufgebaut sind. Hier kann ein modulares Konzept verwirklicht werden, das darin besteht, dass der Hauptfilter serienmäßig im Bagger eingebaut ist und der Nebenstromfilter extra bestellt werden kann und nachträglich eingebaut werden kann. Bei Betrieb des Hydraulikbaggers kann dann beispielsweise auf den Nebenstromfilter verzichtet werden und nur mit dem Hauptfilter gefahren werden. Der Hauptfilter ohne Nebenstromfilter unterscheidet sich grundsätzlich von dem Hauptfilter mit Nebenstromfilter nach der vorliegenden Erfindung nur dadurch, dass er ein anderes Trägerrohr ohne Bohrungen aufweist. Beim Einbau wird also nur das Trägerrohr getauscht und der modular aufgebaute Nebenstromfilter eingebaut. Beim entsprechenden Filterwechsel können je nach Bedarf die zu wechselnden Filterelemente unabhängig voneinander getauscht werden.A advantageous embodiment the present invention is that the main filter with integrated bypass filter are modular. Here can a modular concept that consists in that the main filter as standard in the excavator is installed and the bypass filter can be ordered separately and afterwards can be installed. When operating the hydraulic excavator can then For example, to dispense with the bypass filter and only be driven with the main filter. The main filter without bypass filter is fundamentally different from the main filter with bypass filter according to the present invention only in that it has another support tube without holes. When installing so only the support tube replaced and built the modular bypass filter. At the appropriate filter change can as required, the filter elements to be changed independently it will be exchanged.
Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der beigefügten Zeichnung. Die einzige Figur zeigt eine schematische Schnittdarstellung eines Rücklauffilters mit eingebautem Nebenstromfilter nach einer Ausführungsform der vorliegenden Erfindung.Further Features, details and advantages of the invention will become apparent the attached drawing. The single FIGURE shows a schematic sectional view of a Return filter with built-in bypass filter according to an embodiment of the present invention Invention.
In
der Figur ist ein Rücklauffilter
Der
Rücklauffilter
In
der Zuführleitung
Erfindungsgemäß sind die
Bohrungsquerschnitte der Bohrungen
Im
Nebenstromfilter
Im
Nebenstromfilter
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202005013908U DE202005013908U1 (en) | 2005-09-02 | 2005-09-02 | Filtration arrangement for hydraulic oil, which is located in return line from user device includes a coarse filter primary element and a fine particulates and moisture retaining element connected as a by-pass to the main element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202005013908U DE202005013908U1 (en) | 2005-09-02 | 2005-09-02 | Filtration arrangement for hydraulic oil, which is located in return line from user device includes a coarse filter primary element and a fine particulates and moisture retaining element connected as a by-pass to the main element |
Publications (1)
Publication Number | Publication Date |
---|---|
DE202005013908U1 true DE202005013908U1 (en) | 2007-01-11 |
Family
ID=37681416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE202005013908U Expired - Lifetime DE202005013908U1 (en) | 2005-09-02 | 2005-09-02 | Filtration arrangement for hydraulic oil, which is located in return line from user device includes a coarse filter primary element and a fine particulates and moisture retaining element connected as a by-pass to the main element |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE202005013908U1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010027038A1 (en) * | 2010-07-14 | 2012-01-19 | Hydac Filtertechnik Gmbh | filter element |
CN102454663A (en) * | 2010-10-21 | 2012-05-16 | 杨洁 | Combined device for automatically collecting and storing foreign particles filtered by oil filter |
DE102020201733A1 (en) | 2020-02-12 | 2021-08-12 | Robert Bosch Gesellschaft mit beschränkter Haftung | Filter device and method for determining a loading of a filter of the filter device |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2251130A1 (en) * | 1972-10-19 | 1974-05-02 | Cornelius P Zimmer | Cartridge oil filter for I.C. engine - cartridge held in position by oil pressure and top seal to allow replacement without tools |
DE8417485U1 (en) * | 1984-06-08 | 1987-08-13 | NTZ-Oel-Filter-Technik-GmbH, 5810 Witten | Bypass oil filter for fine filtration of oil in engines |
DE4011913C2 (en) * | 1990-04-12 | 1992-08-20 | Beyer, Rudi, Dipl.-Ing., 4030 Ratingen, De | |
EP0558828B1 (en) * | 1990-11-20 | 1995-06-21 | TECNOCAR S.r.l. | Double-filtering filter for vehicle engine lubricants, with compressible fine filtering cartridge |
DE19647533A1 (en) * | 1995-11-24 | 1997-05-28 | Trinova Gmbh | Apparatus for separating media of differing specific gravities |
DE19955635A1 (en) * | 1999-11-20 | 2001-05-31 | Argo Gmbh Fuer Fluidtechnik | Filtering device, for filtering hydraulic fluids, comprises filter housing containing filter element with partial filter elements |
WO2001051167A1 (en) * | 2000-01-14 | 2001-07-19 | Hydac Filtertechnik Gmbh | Filter device |
DE10127021C1 (en) * | 2001-06-01 | 2003-02-20 | Hydac Filtertechnik Gmbh | Filter element soiling level indication device detects movement of spring-loaded piston subjected to pressures of hydraulic oil on dirty and clean sides of filter on opposite sides |
DE202004015491U1 (en) * | 2004-01-29 | 2004-12-16 | Hydac Filtertechnik Gmbh | Measurement of the level of dirtiness of a filter in a fluid, especially hydraulic fluid, circuit, whereby filtered and unfiltered fluid are connected to a differential pressure transducer that is linked to evaluation electronics |
-
2005
- 2005-09-02 DE DE202005013908U patent/DE202005013908U1/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2251130A1 (en) * | 1972-10-19 | 1974-05-02 | Cornelius P Zimmer | Cartridge oil filter for I.C. engine - cartridge held in position by oil pressure and top seal to allow replacement without tools |
DE8417485U1 (en) * | 1984-06-08 | 1987-08-13 | NTZ-Oel-Filter-Technik-GmbH, 5810 Witten | Bypass oil filter for fine filtration of oil in engines |
DE4011913C2 (en) * | 1990-04-12 | 1992-08-20 | Beyer, Rudi, Dipl.-Ing., 4030 Ratingen, De | |
EP0558828B1 (en) * | 1990-11-20 | 1995-06-21 | TECNOCAR S.r.l. | Double-filtering filter for vehicle engine lubricants, with compressible fine filtering cartridge |
DE19647533A1 (en) * | 1995-11-24 | 1997-05-28 | Trinova Gmbh | Apparatus for separating media of differing specific gravities |
DE19955635A1 (en) * | 1999-11-20 | 2001-05-31 | Argo Gmbh Fuer Fluidtechnik | Filtering device, for filtering hydraulic fluids, comprises filter housing containing filter element with partial filter elements |
WO2001051167A1 (en) * | 2000-01-14 | 2001-07-19 | Hydac Filtertechnik Gmbh | Filter device |
DE10127021C1 (en) * | 2001-06-01 | 2003-02-20 | Hydac Filtertechnik Gmbh | Filter element soiling level indication device detects movement of spring-loaded piston subjected to pressures of hydraulic oil on dirty and clean sides of filter on opposite sides |
DE202004015491U1 (en) * | 2004-01-29 | 2004-12-16 | Hydac Filtertechnik Gmbh | Measurement of the level of dirtiness of a filter in a fluid, especially hydraulic fluid, circuit, whereby filtered and unfiltered fluid are connected to a differential pressure transducer that is linked to evaluation electronics |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010027038A1 (en) * | 2010-07-14 | 2012-01-19 | Hydac Filtertechnik Gmbh | filter element |
US10307699B2 (en) | 2010-07-14 | 2019-06-04 | Hydac Filtertechnik Gmbh | Filtering element |
CN102454663A (en) * | 2010-10-21 | 2012-05-16 | 杨洁 | Combined device for automatically collecting and storing foreign particles filtered by oil filter |
DE102020201733A1 (en) | 2020-02-12 | 2021-08-12 | Robert Bosch Gesellschaft mit beschränkter Haftung | Filter device and method for determining a loading of a filter of the filter device |
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R152 | Utility model maintained after payment of third maintenance fee after eight years | ||
R152 | Utility model maintained after payment of third maintenance fee after eight years |
Effective date: 20131008 |
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R071 | Expiry of right |