EP1544477A2 - Return filtering system - Google Patents

Return filtering system Download PDF

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Publication number
EP1544477A2
EP1544477A2 EP04028686A EP04028686A EP1544477A2 EP 1544477 A2 EP1544477 A2 EP 1544477A2 EP 04028686 A EP04028686 A EP 04028686A EP 04028686 A EP04028686 A EP 04028686A EP 1544477 A2 EP1544477 A2 EP 1544477A2
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EP
European Patent Office
Prior art keywords
filter
return
tank
hydraulic
bypass valve
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.)
Granted
Application number
EP04028686A
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German (de)
French (fr)
Other versions
EP1544477A3 (en
EP1544477B1 (en
Inventor
Recep Macit
Christoph Stönner
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STILL GmbH
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STILL GmbH
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Publication of EP1544477A2 publication Critical patent/EP1544477A2/en
Publication of EP1544477A3 publication Critical patent/EP1544477A3/en
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Publication of EP1544477B1 publication Critical patent/EP1544477B1/en
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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

Definitions

  • the invention relates to a return filter system for a hydraulic system of a mobile Work machine, in particular an industrial truck, with a filter head, the working hydraulic side has a return port, which tank side in a Connection for a filter element opens, and with a bypass valve, with which the Return connection is bypassable with the filter element connected to the tank.
  • Hydraulic systems with return filter systems are often used in mobile Work machines such as e.g. Industrial trucks used. Typical industrial trucks are Forklift trucks, reach trucks and high-lift forklifts, where the hydraulic system a part of the load handling device for lifting, moving and tilting a Last is.
  • return flow filter systems is in the return of the hydraulic valves and consumers to the tank a filter for the hydraulic oil arranged.
  • the filter is attached to a filter head, which in turn attached to the tank.
  • the filter head has a return port to which the return line coming from the hydraulic valves and consumers connected.
  • the entering through the return port in the filter head Hydraulic oil flows into the tank via the connection on the tank side of the filter head Filter element and through this in the pressure-free tank of the hydraulic system.
  • the Filter element removes dirt particles from the hydraulic oil.
  • a Bypass valve is provided, usually as a spring-loaded check valve is executed and thus opens at a certain, preset pressure value.
  • bypass valve is part of the Filter element executed and is always with a change of the filter element with even if it is fully functional on its own. This increases the cost of materials for the ongoing maintenance of the return filter system on the actually required level.
  • the invention is therefore based on the object, a return filter system for To provide, in which the ongoing maintenance costs are minimized.
  • bypass valve part of Filter head is.
  • the bypass valve is no longer part of the filter element, but integrated into the filter head.
  • the outlet of the bypass valve opens via a corresponding channel in the filter head also in the tank.
  • the filter element can thus be changed independently of the bypass valve.
  • the bypass valve must only be replaced if it is actually defective.
  • the further tank-side connection is formed by a dip tube.
  • the Immersion tube which opens into the lowest point in the tank, allows in case of failure of the Pump of the steering hydraulic an emergency oil supply, in which case hydraulic oil on the Submersible tube is sucked.
  • the filter head has a receptacle for a ventilation filter on.
  • a ventilation filter on.
  • ambient air can be filtered in enter the tank when the volume of hydraulic oil in the tank is high reduced.
  • the filter head has a receptacle for a dipstick having. With the dipstick, the fill level in the tank can be measured manually
  • the ventilation filter and the dipstick a common recording exhibit. At the top of the tank so that only a single opening is provided, where the intake for ventilation filter and dipstick is attached.
  • the figure shows a tank 1 a hydraulic system of a mobile machine with an attached filter head 2.
  • the return lines, not shown hydraulic consumers of the mobile working machine flow into the working hydraulic side return port 3 in the filter head 2.
  • the through the Return port 3 entering the filter head 2 hydraulic oil is a tank-side connection 5 in a filter element 4 and passed from this into the tank 1.
  • Another working hydraulic side connection 6 is for a hydraulic Provided steering device.
  • This port 6 is without an intermediate filter connected to a dip tube 7, which is arranged so that the opening at the bottom End of the dip tube 7 is disposed at the lowest point in the tank 1.
  • a bypass valve 8 is integrated in the filter head 2, which in open State connects the return port 3 with the suction pipe 7.
  • the bypass valve 8 is designed as a spring-loaded check valve, which then opens automatically when in front of the filter element 4 by a preset value greater hydraulic pressure is present, as in the directly connected to the tank 1 suction 7. For example if the filter element 4 is too dirty, that will be at the return port 3 incoming hydraulic oil past the filter element 4 via the suction pipe 7 in the Tank 1 passed.
  • the Filter element 4 can be replaced independently of the bypass valve 8.
  • a dipstick 9 with a to call integrated ventilation filter 10.
  • the dipstick 9 is used to measure the Level in the tank, while the ventilation filter 10 via a not shown Channel in the tank 1 incoming ambient air filters.

Abstract

The return filter system for a hydraulic system of a mobile working machine, especially a floor conveyor, has a filter head (2) which on the working hydraulics side has a return connection (3) which on the tank side runs into a connection (5) for a filter element (4). A bypass valve (8), by which the return connection is connected to the tank with bypassing of the filter element, is part of the filter head. The return connection is connected to an additional tank side connection by means of the bypass valve.

Description

Die Erfindung betrifft ein Rücklauffiltersystem für eine Hydraulikanlage einer mobilen Arbeitsmaschine, insbesondere eines Flurförderzeugs, mit einem Filterkopf, der arbeitshydraulikseitig einen Rücklaufanschluss aufweist, welcher tankseitig in einen Anschluss für ein Filterelement mündet, und mit einem Bypassventil, mit dem der Rücklaufanschluss unter Umgehung des Filterelements mit dem Tank verbindbar ist.The invention relates to a return filter system for a hydraulic system of a mobile Work machine, in particular an industrial truck, with a filter head, the working hydraulic side has a return port, which tank side in a Connection for a filter element opens, and with a bypass valve, with which the Return connection is bypassable with the filter element connected to the tank.

Hydraulikanlagen mit Rücklauffiltersystemen werden häufig in mobilen Arbeitsmaschinen wie z.B. Flurförderzeugen eingesetzt. Typische Flurförderzeuge sind Gabelstapler, Schubmaststapler und Hochregalstapler, bei denen die Hydraulikanlage ein Teil der Lasthandhabungsvorrichtung zum Anheben, Verschieben und Neigen einer Last ist. Bei gattungsgemäßen Rücklauffiltersystemen ist in dem Rücklauf der hydraulischen Ventile und Verbraucher zum Tank ein Filter für das Hydrauliköl angeordnet. Hierbei ist der Filter an einem Filterkopf befestigt, welcher wiederum an dem Tank befestigt ist. Der Filterkopf weist einen Rücklaufanschluss auf, an welchen die von den hydraulischen Ventilen und Verbrauchern kommende Rücklaufleitung angeschlossen ist. Das durch den Rücklaufanschluss in den Filterkopf eintretende Hydrauliköl fließt über den Anschluss an der Tankseite des Filterkopfes in das Filterelement und durch dieses in den drucklosen Tank der Hydraulikanlage. Das Filterelement entfernt dabei Schmutzpartikel aus dem Hydrauliköl.Hydraulic systems with return filter systems are often used in mobile Work machines such as e.g. Industrial trucks used. Typical industrial trucks are Forklift trucks, reach trucks and high-lift forklifts, where the hydraulic system a part of the load handling device for lifting, moving and tilting a Last is. In generic return flow filter systems is in the return of the hydraulic valves and consumers to the tank a filter for the hydraulic oil arranged. Here, the filter is attached to a filter head, which in turn attached to the tank. The filter head has a return port to which the return line coming from the hydraulic valves and consumers connected. The entering through the return port in the filter head Hydraulic oil flows into the tank via the connection on the tank side of the filter head Filter element and through this in the pressure-free tank of the hydraulic system. The Filter element removes dirt particles from the hydraulic oil.

Wenn der Druckverlust an dem Filterelement, beispielsweise in Folge zu hoher Viskosität des Hydrauliköls und/oder zu starker Verschmutzung des Filterelements einen voreingestellten Wert übersteigt, wird das Hydrauliköl aus der Rücklaufleitung an dem Filterelement vorbei direkt in den Tank geleitet. Zu diesem Zweck ist ein Bypassventil vorgesehen, das in der Regel als federbelastetes Rückschlagventil ausgeführt ist und damit bei einem bestimmten, voreingestellten Druckwert öffnet.If the pressure loss on the filter element, for example, in consequence of too high Viscosity of the hydraulic oil and / or excessive contamination of the filter element exceeds a preset value, the hydraulic oil from the return line becomes passing the filter element directly into the tank. For this purpose is a Bypass valve is provided, usually as a spring-loaded check valve is executed and thus opens at a certain, preset pressure value.

Bei Rücklauffiltersystemen des Standes der Technik ist das Bypassventil als Teil des Filterelements ausgeführt und wird bei einem Wechsel des Filterelements stets mit ausgetauscht, auch wenn es für sich genommen voll funktionsfähig ist. Dadurch erhöht sich der Materialaufwand für die laufende Wartung des Rücklauffiltersystems über das eigentlich erforderliche Maß hinaus.In prior art backflow filtration systems, the bypass valve is part of the Filter element executed and is always with a change of the filter element with even if it is fully functional on its own. This increases the cost of materials for the ongoing maintenance of the return filter system on the actually required level.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Rücklauffiltersystem zur Verfügung zu stellen, bei dem die laufenden Wartungskosten minimiert sind.The invention is therefore based on the object, a return filter system for To provide, in which the ongoing maintenance costs are minimized.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Bypassventil Teil des Filterkopfes ist. Das Bypassventil ist dabei nicht mehr Bestandteil des Filterelements, sondern in den Filterkopf integriert. Der Ausgang des Bypassventils mündet über einen entsprechenden Kanal im Filterkopf ebenfalls in den Tank. Das Filterelement kann damit unabhängig von dem Bypassventil gewechselt werden. Das Bypassventil muss nur dann ausgetauscht werden, wenn es tatsächlich defekt ist.This object is achieved in that the bypass valve part of Filter head is. The bypass valve is no longer part of the filter element, but integrated into the filter head. The outlet of the bypass valve opens via a corresponding channel in the filter head also in the tank. The filter element can thus be changed independently of the bypass valve. The bypass valve must only be replaced if it is actually defective.

Besondere Vorteile ergeben sich, wenn der Filterkopf einen weiteren arbeitshydraulikseitigen Anschluss und einen weiteren tankseitigen Anschluss aufweist, die miteinander verbunden sind, wobei der Rücklaufanschluss mittels des Bypassventils mit dem weiteren tankseitigen Anschluss verbindbar ist. Das geöffnete Bypassventil stellt damit im Filterkopf eine Querverbindung von dem Rücklaufanschluss der Arbeitshydraulik in Richtung des weiteren tankseitigen Anschlusses her, wobei das Filterelement umgangen wird.Special advantages arise when the filter head another working hydraulics side connection and another tank side connection which are connected to each other, wherein the return port by means of Bypass valve with the other tank-side connection is connectable. The open one Bypass valve thus provides in the filter head a cross connection of the Return connection of the working hydraulics in the direction of the further tank side Connection ago, wherein the filter element is bypassed.

Bei einer in mobilen Arbeitsmaschinen üblichen Anordnung ist der weitere arbeitshydraulikseitige Anschluss mit einer hydraulischen Lenkungsvorrichtung verbunden. Im Normalbetrieb erfolgt der Rücklauf aus der hydraulischen Lenkungsvorrichtung über den genannten weiteren arbeitshydraulikseitigen Anschluss und den weiteren tankseitigen Anschluss des Filterkopfs in den Tank.In a usual arrangement in mobile machines is the other working hydraulic side connection with a hydraulic steering device connected. In normal operation, the return flow is from the hydraulic Steering device via said further working hydraulic side connection and the further tank-side connection of the filter head in the tank.

Hierbei ist der weitere tankseitige Anschluss von einem Tauchrohr gebildet. Das Tauchrohr, das in die tiefste Stelle im Tank mündet, ermöglicht bei einem Ausfall der Pumpe der Lenkhydraulik eine Notölversorgung, wobei dann Hydrauliköl über das Tauchrohr angesaugt wird.Here, the further tank-side connection is formed by a dip tube. The Immersion tube, which opens into the lowest point in the tank, allows in case of failure of the Pump of the steering hydraulic an emergency oil supply, in which case hydraulic oil on the Submersible tube is sucked.

Gemäß einer zweckmäßigen Weiterbildung weist der Filterkopf eine Aufnahme für einen Belüftungsfilter auf. Durch den Belüftungsfilter kann Umgebungsluft gefiltert in den Tank eintreten, wenn sich das Volumen des im Tank befindlichen Hydrauliköls verringert.According to an expedient development, the filter head has a receptacle for a ventilation filter on. Through the ventilation filter ambient air can be filtered in enter the tank when the volume of hydraulic oil in the tank is high reduced.

Weiter ist es zweckmäßig, wenn der Filterkopf eine Aufnahme für einen Peilstab aufweist. Mit dem Peilstab kann manuell die Füllhöhe im Tank gemessen werdenIt is also expedient if the filter head has a receptacle for a dipstick having. With the dipstick, the fill level in the tank can be measured manually

Hierbei können der Belüftungsfilter und der Peilstab eine gemeinsame Aufnahme aufweisen. An der Oberseite des Tanks ist damit nur eine einzige Öffnung vorgesehen, an der die Aufnahme für Belüftungsfilter und Peilstab befestigt ist.Here, the ventilation filter and the dipstick a common recording exhibit. At the top of the tank so that only a single opening is provided, where the intake for ventilation filter and dipstick is attached.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in der schematischen Figur dargestellten Ausführungsbeispiels näher erläutert.Further advantages and details of the invention will be described with reference to the Schematic figure illustrated embodiment explained in more detail.

Die Figur zeigt einen Tank 1 einer Hydraulikanlage einer mobilen Arbeitsmaschine mit einem aufgesetzten Filterkopf 2. Die nicht dargestellten Rücklaufleitungen der hydraulischen Verbraucher der mobilen Arbeitsmaschine münden in den arbeitshydraulikseitigen Rücklaufanschluss 3 im Filterkopf 2. Das durch den Rücklaufanschluss 3 in den Filterkopf 2 eintretende Hydrauliköl wird über einen tankseitigen Anschluss 5 in ein Filterelement 4 und von diesem in den Tank 1 geleitet.The figure shows a tank 1 a hydraulic system of a mobile machine with an attached filter head 2. The return lines, not shown hydraulic consumers of the mobile working machine flow into the working hydraulic side return port 3 in the filter head 2. The through the Return port 3 entering the filter head 2 hydraulic oil is a tank-side connection 5 in a filter element 4 and passed from this into the tank 1.

Ein weiterer arbeitshydraulikseitiger Anschluss 6 ist für eine hydraulische Lenkvorrichtung vorgesehen. Dieser Anschluss 6 ist ohne zwischengeschalteten Filter mit einem Tauchrohr 7 verbunden, das so angeordnet ist, dass die Öffnung am unteren Ende des Tauchrohres 7 an der tiefsten Stelle im Tank 1 angeordnet ist. Durch diese Anordnung ist gewährleistet, dass bei einem Systemausfall in jeder Betriebssituation die Möglichkeit besteht, über die Tankleitung der hydraulischen Lenkungsvorrichtung eine Notölversorgung aufrecht zu erhalten, wobei durch das Tauchrohr 7 Hydrauliköl angesaugt wird.Another working hydraulic side connection 6 is for a hydraulic Provided steering device. This port 6 is without an intermediate filter connected to a dip tube 7, which is arranged so that the opening at the bottom End of the dip tube 7 is disposed at the lowest point in the tank 1. Through this Arrangement ensures that in the event of a system failure in any operating situation the possibility exists, via the tank line of the hydraulic steering device to maintain an emergency oil supply, through the dip tube 7 hydraulic oil is sucked.

Erfindungsgemäß ist in den Filterkopf 2 ein Bypassventil 8 integriert, das in geöffnetem Zustand den Rücklaufanschluss 3 mit dem Saugrohr 7 verbindet. Das Bypassventil 8 ist als federbelastetes Rückschlagventil ausgeführt, das dann automatisch öffnet, wenn vor dem Filterelement 4 ein um einen voreingestellten Wert größerer Hydraulikdruck ansteht, als in dem direkt mit dem Tank 1 verbundenen Saugrohr 7. Beispielsweise wenn das Filterelement 4 zu stark verschmutzt ist, wird das an dem Rücklaufanschluss 3 ankommende Hydrauliköl an dem Filterelement 4 vorbei über das Saugrohr 7 in den Tank 1 geleitet. Bei der vorliegenden Anordnung ergibt sich der Vorteil, dass das Filterelement 4 unabhängig von dem Bypassventil 8 ausgetauscht werden kann.According to the invention a bypass valve 8 is integrated in the filter head 2, which in open State connects the return port 3 with the suction pipe 7. The bypass valve 8 is designed as a spring-loaded check valve, which then opens automatically when in front of the filter element 4 by a preset value greater hydraulic pressure is present, as in the directly connected to the tank 1 suction 7. For example if the filter element 4 is too dirty, that will be at the return port 3 incoming hydraulic oil past the filter element 4 via the suction pipe 7 in the Tank 1 passed. In the present arrangement, there is the advantage that the Filter element 4 can be replaced independently of the bypass valve 8.

Als weiteres in den Filterkopf 2 integriertes Element ist ein Peilstab 9 mit einem integrierten Belüftungsfilter 10 zu nennen. Der Peilstab 9 dient zum Messen des Füllstands im Tank, während der Belüftungsfilter 10 die über einen nicht dargestellten Kanal in den Tank 1 eintretende Umgebungsluft filtert.As another in the filter head 2 integrated element is a dipstick 9 with a to call integrated ventilation filter 10. The dipstick 9 is used to measure the Level in the tank, while the ventilation filter 10 via a not shown Channel in the tank 1 incoming ambient air filters.

Claims (7)

Rücklauffiltersystem für eine Hydraulikanlage einer mobilen Arbeitsmaschine, insbesondere eines Flurförderzeugs, mit einem Filterkopf (2), der arbeitshydraulikseitig einen Rücklaufanschluss (3) aufweist, welcher tankseitig in einen Anschluss (5) für ein Filterelement (4) mündet, und mit einem Bypassventil (8), mit dem der Rücklaufanschluss (3) unter Umgehung des Filterelements (4) mit dem Tank verbindbar ist, dadurch gekennzeichnet, dass das Bypassventil (8) Teil des Filterkopfes (2) ist.Return filter system for a hydraulic system of a mobile work machine, in particular a truck, with a filter head (2), the working hydraulics side has a return port (3), the tank side in a port (5) for a filter element (4) opens, and with a bypass valve (8 ), with which the return port (3), bypassing the filter element (4) is connectable to the tank, characterized in that the bypass valve (8) is part of the filter head (2). Rücklauffiltersystem nach Anspruch 1, dadurch gekennzeichnet, dass der Filterkopf (2) einem weiteren arbeitshydraulikseitigen Anschluss (6) und einen weiteren tankseitigen Anschluss aufweist, die miteinander verbunden sind, wobei der Rücklaufanschluss (3) mittels des Bypassventils (8) mit dem weiteren tankseitigen Anschluss verbindbar ist.Return filter system according to claim 1, characterized in that the filter head (2) has a further hydraulic connection side (6) and a further tank-side connection, which are interconnected, wherein the return port (3) by means of the bypass valve (8) with the further tank-side connection is connectable. Rücklauffiltersystem nach Anspruch 2, dadurch gekennzeichnet, dass der weitere arbeitshydraulikseitige Anschluss (6) mit einer hydraulischen Lenkungsvorrichtung verbunden ist.Return filter system according to claim 2, characterized in that the further working hydraulic side connection (6) is connected to a hydraulic steering device. Rücklauffiltersystem nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der weitere tankseitige Anschluss von einem Tauchrohr (7) gebildet ist.Return filter system according to claim 2 or 3, characterized in that the further tank-side connection of a dip tube (7) is formed. Rücklauffiltersystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Filterkopf (2) eine Aufnahme für einen Belüftungsfilter (10) aufweist.Return filter system according to one of claims 1 to 4, characterized in that the filter head (2) has a receptacle for a ventilation filter (10). Rücklauffiltersystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Filterkopf (2) eine Aufnahme für einen Peilstab (9) aufweist.Return filter system according to one of claims 1 to 5, characterized in that the filter head (2) has a receptacle for a dipstick (9). Rücklauffiltersystem nach Anspruch 5 und 6, dadurch gekennzeichnet, dass der Belüftungsfilter (10) und der Peilstab (9) eine gemeinsame Aufnahme aufweisen.Return filter system according to claim 5 and 6, characterized in that the ventilation filter (10) and the dipstick (9) have a common receptacle.
EP04028686A 2003-12-17 2004-12-03 Return filtering system Active EP1544477B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359083 2003-12-17
DE10359083A DE10359083A1 (en) 2003-12-17 2003-12-17 Return filter system

Publications (3)

Publication Number Publication Date
EP1544477A2 true EP1544477A2 (en) 2005-06-22
EP1544477A3 EP1544477A3 (en) 2008-07-16
EP1544477B1 EP1544477B1 (en) 2011-11-16

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EP04028686A Active EP1544477B1 (en) 2003-12-17 2004-12-03 Return filtering system

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EP (1) EP1544477B1 (en)
DE (1) DE10359083A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10113179A1 (en) 2001-03-19 2002-09-26 Rt Filtertechnik Gmbh Filter for cleaning hydraulic media, comprises filter head, filter insert, inlet chamber, housing, bypass valve and pre-tensioning valve

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7139745U (en) * 1972-01-27 International Haryester Co Mbh Device for ventilating and ventilating oil-bearing rooms
US3486622A (en) * 1967-01-18 1969-12-30 Parker Hannifin Corp Bayonet filter
JPS565224A (en) * 1979-06-27 1981-01-20 Komatsu Ltd Hydraulic circuit for vehicle
DE4206420C2 (en) * 1992-02-29 1994-10-06 Epe Eppensteiner Gmbh & Co filter
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10113179A1 (en) 2001-03-19 2002-09-26 Rt Filtertechnik Gmbh Filter for cleaning hydraulic media, comprises filter head, filter insert, inlet chamber, housing, bypass valve and pre-tensioning valve

Also Published As

Publication number Publication date
EP1544477A3 (en) 2008-07-16
EP1544477B1 (en) 2011-11-16
DE10359083A1 (en) 2005-07-21

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