EP1544477A2 - Rücklauffiltersystem - Google Patents
Rücklauffiltersystem Download PDFInfo
- 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
- Authority
- 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
Links
- 238000001914 filtration Methods 0.000 title description 2
- 238000009423 ventilation Methods 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 description 10
- 239000012080 ambient air Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
Description
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.
- 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.
- Rücklauffiltersystem nach Anspruch 2, dadurch gekennzeichnet, dass der weitere arbeitshydraulikseitige Anschluss (6) mit einer hydraulischen Lenkungsvorrichtung verbunden ist.
- Rücklauffiltersystem nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der weitere tankseitige Anschluss von einem Tauchrohr (7) gebildet ist.
- Rücklauffiltersystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Filterkopf (2) eine Aufnahme für einen Belüftungsfilter (10) aufweist.
- Rücklauffiltersystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Filterkopf (2) eine Aufnahme für einen Peilstab (9) aufweist.
- Rücklauffiltersystem nach Anspruch 5 und 6, dadurch gekennzeichnet, dass der Belüftungsfilter (10) und der Peilstab (9) eine gemeinsame Aufnahme aufweisen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10359083 | 2003-12-17 | ||
| DE10359083A DE10359083A1 (de) | 2003-12-17 | 2003-12-17 | Rücklauffiltersystem |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1544477A2 true EP1544477A2 (de) | 2005-06-22 |
| EP1544477A3 EP1544477A3 (de) | 2008-07-16 |
| EP1544477B1 EP1544477B1 (de) | 2011-11-16 |
Family
ID=34485424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04028686A Expired - Lifetime EP1544477B1 (de) | 2003-12-17 | 2004-12-03 | Rücklauffiltersystem |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1544477B1 (de) |
| DE (1) | DE10359083A1 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10113179A1 (de) | 2001-03-19 | 2002-09-26 | Rt Filtertechnik Gmbh | Filter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7139745U (de) * | 1972-01-27 | International Haryester Co Mbh | Vorrichtung zum Be und Entlüften von ölführenden Räumen | |
| 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 (de) * | 1992-02-29 | 1994-10-06 | Epe Eppensteiner Gmbh & Co | Filter |
| DE19955635A1 (de) * | 1999-11-20 | 2001-05-31 | Argo Gmbh Fuer Fluidtechnik | Filtervorrichtung |
-
2003
- 2003-12-17 DE DE10359083A patent/DE10359083A1/de not_active Withdrawn
-
2004
- 2004-12-03 EP EP04028686A patent/EP1544477B1/de not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10113179A1 (de) | 2001-03-19 | 2002-09-26 | Rt Filtertechnik Gmbh | Filter |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1544477A3 (de) | 2008-07-16 |
| DE10359083A1 (de) | 2005-07-21 |
| EP1544477B1 (de) | 2011-11-16 |
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