EP1544477A2 - Système de filtrage dans le retour - Google Patents

Système de filtrage dans le retour 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
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
Application number
EP04028686A
Other languages
German (de)
English (en)
Other versions
EP1544477A3 (fr
EP1544477B1 (fr
Inventor
Recep Macit
Christoph Stönner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STILL GmbH
Original Assignee
STILL GmbH
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 STILL GmbH filed Critical STILL GmbH
Publication of EP1544477A2 publication Critical patent/EP1544477A2/fr
Publication of EP1544477A3 publication Critical patent/EP1544477A3/fr
Application granted granted Critical
Publication of EP1544477B1 publication Critical patent/EP1544477B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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)
EP04028686A 2003-12-17 2004-12-03 Système de filtrage dans le retour Expired - Lifetime EP1544477B1 (fr)

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 (fr) 2005-06-22
EP1544477A3 EP1544477A3 (fr) 2008-07-16
EP1544477B1 EP1544477B1 (fr) 2011-11-16

Family

ID=34485424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04028686A Expired - Lifetime EP1544477B1 (fr) 2003-12-17 2004-12-03 Système de filtrage dans le retour

Country Status (2)

Country Link
EP (1) EP1544477B1 (fr)
DE (1) DE10359083A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10113179A1 (de) 2001-03-19 2002-09-26 Rt Filtertechnik Gmbh Filter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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 (fr) 2008-07-16
DE10359083A1 (de) 2005-07-21
EP1544477B1 (fr) 2011-11-16

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