EP1288506A2 - Système hydraulique pour réduire l'effet de la pesanteur pour engins - Google Patents

Système hydraulique pour réduire l'effet de la pesanteur pour engins Download PDF

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Publication number
EP1288506A2
EP1288506A2 EP02018362A EP02018362A EP1288506A2 EP 1288506 A2 EP1288506 A2 EP 1288506A2 EP 02018362 A EP02018362 A EP 02018362A EP 02018362 A EP02018362 A EP 02018362A EP 1288506 A2 EP1288506 A2 EP 1288506A2
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EP
European Patent Office
Prior art keywords
pressure
hydraulic
hydraulic system
check valve
lifting
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
EP02018362A
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German (de)
English (en)
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EP1288506A3 (fr
EP1288506B1 (fr
Inventor
Rolf Isele
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Kuepper Weisser GmbH
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Kuepper Weisser GmbH
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Publication date
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Publication of EP1288506A3 publication Critical patent/EP1288506A3/fr
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Publication of EP1288506B1 publication Critical patent/EP1288506B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
    • E01H5/04—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material
    • E01H5/06—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by non-driven elements, e.g. scraper blades, snow-plough blades, scoop blades
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F15B2211/41518—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve being connected to multiple pressure sources
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a hydraulic system for connection to a Actuating cylinder to move dynamically vertically over the actuating cylinder to relieve moving implement weight.
  • Such a hydraulic system is particularly useful for unloading your own weight a snow plow attached to a winter service vehicle, but is also in connection with other add-on units such as a mower. It is especially for suitable for all devices that follow the ground contour and are therefore indirect or lie directly on the floor. This should follow on Example of a snow plow mounted on a winter service vehicle are explained.
  • the snow plow lies on the road surface due to its own weight on what is necessary to make snow and ice reliable to clear the surface of the road, but what on the other hand heavy wear on the lower edge of the snow plow and the risk of Damage caused by approaching solid obstacles brings. Therefore, the hydraulic system for lifting and Lowering the plow so designed that the pressure in the lifting chamber of the actuating cylinder responsible for lifting and lowering is increased, without lifting the plow off the road surface. Thereby the weight of the plow is partially transferred to the carrier vehicle, which makes the carrier vehicle easier to steer and drive.
  • the Weight relief is set so that the plow has a residual force rests on the road surface, which is necessary for the reliable clearing of Snow and ice are enough.
  • the hydraulic system from the prior art comprises a first hydraulic line 1 and a second hydraulic line 2, the via a 4/3-way valve alternately with one of an electric motor M driven pump P and a tank 10 are connected.
  • the first Hydraulic line is at its other end to the lifting chamber 101 an actuating cylinder 100 (hereinafter also referred to as “lifting hydraulic line”) and the second hydraulic line 2 to the lowering chamber 102 of the actuating cylinder 100 connected (hereinafter also "sink hydraulic line").
  • lifting hydraulic line actuating cylinder 100
  • second hydraulic line 2 to the lowering chamber 102 of the actuating cylinder 100 connected
  • the backflow from the lifting chamber 101 can be done by means of a check valve device 4 can be blocked to activate a hydraulic accumulator system 5.
  • a check valve device 4 In the position of the check valve 4 shown in FIG Actuating cylinder as usual for lifting and lowering a device to use.
  • the setting of the pressure setpoint thus takes place via the pressure relief valve 9.
  • the in the hydraulic accumulator system 5 prevailing pressure, the pressure of the lifting chamber corresponds, can be read off a manometer 7. Now If the device is run over an elevation, the pressure in the Lifting chamber 101 and oil flows from the hydraulic accumulator 6 into the lifting chamber 101 after, so that the pressure relief is restored. If the device lowers to the normal position, the oil flows back to the hydraulic accumulator.
  • the object of the present invention is therefore a hydraulic system of the type mentioned at the outset, in which the need to Replenish hydraulic fluid is largely reduced.
  • An essential aspect of the invention is the fact that the target pressure not in the hydraulic accumulator system via a pressure relief valve is set passively but instead is actively regulated.
  • There is one Control device is provided which causes hydraulic fluid in the Lifting chamber is pumped in or drained from the lifting chamber when the pressure prevailing in the lifting chamber of the specified target pressure deviates. But as long as the pressure conditions move within a tolerance range around the target pressure the electric motor driving the hydraulic pump is not activated.
  • the pressure measurement is based on which the system is hydraulic fluid is fed in or discharged, a value averaged over time the pressure measured in the lifting chamber.
  • This has the advantage that short-term strong pressure fluctuations outside the tolerance range due to particularly uneven road conditions give rise to constant pressure equalization of the system. Much more such peak pressures are lost in the time average.
  • the tolerance range accordingly can be chosen closely around the setpoint, and if the pressure average moves out of this tolerance range, so this is clearly due to the fact that there is too much in the system or there is insufficient hydraulic fluid. Only in these cases the hydraulic fluid volume can be regulated.
  • valves of the hydraulic system are preferably seat valves executed as seat valves cause almost no leakage and the hydraulic system thus almost no loss of hydraulic fluid inherent in the system must compensate.
  • a check valve device is preferably used to regulate the hydraulic pressure open in the lifting hydraulic line when the pressure in the upper pressure limit of the tolerance range exceeds.
  • Such a check valve device is in the hydraulic system provided anyway to close the hydraulic accumulator system to activate the valve. So there are no additional components required to implement this function.
  • that is Check valve device preferably in the context of an electronic Regulation of the hydraulic system as an electrically switchable valve.
  • Hydraulic system comprises a first hydraulic line 1, the the lifting chamber 101 of an actuating cylinder 100 is connected, and a second hydraulic line 2 connected to the sink chamber 102 thereof Actuating cylinder 100 is connected. Both hydraulic lines 1, 2 are via a spring-centered, electromagnetically operated 4/3-way valve 3 mutually connected to a pump P and a tank 10. The pump P is driven by an electric motor M.
  • the aforementioned Elements are used for lifting and lowering, for example a snow plow by means of the actuating cylinder 100. That is, if that Control valve 3 from the blocking position shown in Figure 1 is shifted to the left, hydraulic fluid into the lifting chamber 101 of the Actuating cylinder 100 are pumped to raise the plow.
  • the hydraulic accumulator system 5 is switched on.
  • the check valve 8 activated. That is, by electromagnetic Operation is the shut-off valve 8 from the position shown in Figure 1 switched to the other of the two possible positions to To connect the hydraulic accumulator system 5 to the lifting hydraulic line 1.
  • a one-way check valve 12 is activated. That is, the check valve 12 becomes by electromagnetic actuation brought into its locked position so that the hydraulic accumulator system apart is closed by the connection to the lifting hydraulic line 1.
  • the check valve 12 has only the function, the pressure in the hydraulic accumulator system 5 drain when the hydraulic accumulator system 5 by switching off of the check valve 8 separated from the lifting hydraulic line 1 becomes. On the check valve 12 and the associated hydraulic line 13 to tank 10 can therefore be dispensed with if necessary. Finally the check valve 4 also becomes active as shown in FIG Position switched. When the hydraulic accumulator system 5 is activated all valves 4, 8, 12 in their active position, so that between the Actuating piston 103 of the actuating cylinder 100, the check valve 11 of the Check valve 4 and the check valve of the check valve 12 a hydraulic fluid column is clamped.
  • a change in volume of the lifting chamber 101 of the actuating cylinder 100 due to a movement of the actuating piston 103 is then only from the hydraulic accumulator 6 of the hydraulic accumulator system 5 balanced. Furthermore, the control valve 3 at activated hydraulic storage system 5 moved to the left to the sink chamber 102 of the actuating cylinder 100 to be connected to the tank 10, so that the adjusting piston 103 can perform free movements.
  • a pressure relief valve 9 provided, which, unlike in the prior art according to FIG. 2, is not used to set a pressure setpoint, but only that Function of a safety valve takes over. Because hydraulic accumulators are Energy sources with pressurized gases that can explode and therefore equipped with safety valves and emergency devices Need to become.
  • the pressure relief valve 9 according to Figure 1 is therefore set to a pressure value that is far above the usual working pressure, namely the permissible maximum pressure of the hydraulic accumulator 6 lies.
  • the hydraulic accumulator 6 is preferably designed as a membrane accumulator, for example, has a content of 1.4 liters and for a normal one Working pressure range from 45 bar to 140 bar is designed, whereby the maximum permissible pressure to which the safety pressure relief valve 9 is set, is far above this work area.
  • the desired set pressure in the activated hydraulic accumulator system 5 is by means of the electric motor M and the pump P via the hydraulic lifting line 1 built. At high target pressure values of 80, for example bar, this pressure can be reached exactly with relative ease. The However, pressure builds up so quickly in the lower pressure range that a lower set pressure of, for example, only 50 bar in this way can no longer be set exactly. Hence the regulatory system of the hydraulic system programmed so that the target pressure of one higher pressure is regulated starting.
  • control valve 3 is then moved to the right position around the lifting hydraulic line 1 to connect to the tank 10, and then that Shut-off valve 4 operated briefly until the pressure in the lifting hydraulic line 1 and the hydraulic accumulator system 5 connected to it the desired one Target pressure has reached.
  • the same regulation based on A higher pressure on the desired pressure can also be immediate when lowering the plow.
  • the one-sided, adjustable throttles 14 in the two hydraulic lines 1, 2 are used thereby preventing the system from swinging open.
  • an electronic pressure switch 15 is provided which has a tolerance range p 2 ⁇ p S ⁇ p 1 around the desired set pressure p S defined. Only when the pressure p in the lifting hydraulic line 1 drops below the lower tolerance value p 2 or rises above the upper tolerance value p 1 , is hydraulic fluid pumped in or discharged. The pressure p is then preferably adjusted back to the set pressure p s .
  • Adjusting the pressure p prevailing in the system to a desired pressure value p S which lies between the upper and lower tolerance values p 1 and p 2 , has the advantage that the electric motor driving the pump is only required if the pressure p is below the lower tolerance value p 2 decreases. This protects the battery driving the electric motor. Within this tolerance range, the hydraulic fluid flows associated with the pressure fluctuations are absorbed by the hydraulic accumulator 6.
  • the pressure p in the system is preferably measured as the mean pressure over time. This is represented in FIG. 1 by a slow-acting manometer 7. According to the preferred embodiment, however, the pressure averaging over time is carried out by a computer, so that the setpoint pressure regulation can take place without a time delay on the basis of the instantaneous pressure that is actually present at the respective time. Only after adjustment to the target pressure p S is the computer-controlled pressure averaging carried out.
  • the pressure averaging has the advantage that extreme unevenness in the floor not immediately to add or drain the hydraulic oil cause what the electric motor and thus the electric motor driving battery can also be protected.
  • valves 4, 8, 12 for activation of the hydraulic accumulator system and to control the pressure when activated Hydraulic accumulator systems are controlled by an electronic control system Control device controlled.
  • the valves are therefore each as Solenoid valves executed.
  • an operating variant sees a step by step Adjustment of the counter pressure instead of a continuous one Adjustment before. Accordingly, the operator can choose between three relief settings, namely "minimal relief”, “medium relief” and “maximum relief”.
  • the minimal relief corresponds approximately to the floating position of the plow, whereas the mean plow relief, for example a remaining plow weight of 400 kg and the maximum plow relief a remaining Plow weight of 300 kg corresponds.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Safety Valves (AREA)
  • Control Of Fluid Pressure (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
EP02018362A 2001-09-03 2002-08-14 Système hydraulique pour réduire l'effet de la pesanteur pour engins Expired - Lifetime EP1288506B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20114538U DE20114538U1 (de) 2001-09-03 2001-09-03 Hydrauliksystem für die Eigengewichtsentlastung von Anbaugeräten
DE20114538U 2001-09-03

Publications (3)

Publication Number Publication Date
EP1288506A2 true EP1288506A2 (fr) 2003-03-05
EP1288506A3 EP1288506A3 (fr) 2004-04-21
EP1288506B1 EP1288506B1 (fr) 2006-03-22

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EP02018362A Expired - Lifetime EP1288506B1 (fr) 2001-09-03 2002-08-14 Système hydraulique pour réduire l'effet de la pesanteur pour engins

Country Status (3)

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EP (1) EP1288506B1 (fr)
AT (1) ATE321212T1 (fr)
DE (2) DE20114538U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1733996A1 (fr) * 2005-06-15 2006-12-20 OIL CONTROL S.p.A. Dispositif hydraulique pour lever et baisser un bras articulé à un véhicule de travail
US7690450B2 (en) 2006-09-12 2010-04-06 Parker-Hannifin Corporation System for operating a hydraulically actuated device
AT515369A3 (de) * 2014-02-14 2015-12-15 Thomas Dr Löcher Anordnung zur Regelung eines hydraulischen Antriebselements
US10881043B2 (en) 2017-11-20 2021-01-05 Mendelova Univerzita V Brne. Agronomicka Fakulta, Ustav Techniky A Automobilove Dopravy Method for increasing the load on driving rear wheels of tractors during soil cultivation
FR3134281A1 (fr) * 2022-04-07 2023-10-13 Kuhn Sas Machine de fenaison avec un allègement hydraulique amélioré et son procédé de mise en fonctionnement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20208989U1 (de) 2002-06-10 2003-10-23 HAWE Hydraulik GmbH & Co. KG, 81673 München Elektrohydraulische Spannvorrichtung
DE20215838U1 (de) * 2002-10-15 2004-02-26 Hawe Hydraulik Gmbh & Co. Kg Computerisierte elektrohydraulische Proportional-Steuervorrichtung
DE10345956A1 (de) 2003-10-02 2005-04-21 Deere & Co Hydraulische Anordnung und Verfahren für eine solche
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EP1733996A1 (fr) * 2005-06-15 2006-12-20 OIL CONTROL S.p.A. Dispositif hydraulique pour lever et baisser un bras articulé à un véhicule de travail
US7690450B2 (en) 2006-09-12 2010-04-06 Parker-Hannifin Corporation System for operating a hydraulically actuated device
AT515369A3 (de) * 2014-02-14 2015-12-15 Thomas Dr Löcher Anordnung zur Regelung eines hydraulischen Antriebselements
AT515369B1 (de) * 2014-02-14 2018-03-15 Thomas Dr Loecher Anordnung zur Regelung eines hydraulischen Antriebselements
DE102014202766B4 (de) 2014-02-14 2023-04-27 Thomas Löcher Anordnung zur Regelung eines hydraulischen Antriebselements
US10881043B2 (en) 2017-11-20 2021-01-05 Mendelova Univerzita V Brne. Agronomicka Fakulta, Ustav Techniky A Automobilove Dopravy Method for increasing the load on driving rear wheels of tractors during soil cultivation
FR3134281A1 (fr) * 2022-04-07 2023-10-13 Kuhn Sas Machine de fenaison avec un allègement hydraulique amélioré et son procédé de mise en fonctionnement

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EP1288506A3 (fr) 2004-04-21
EP1288506B1 (fr) 2006-03-22
DE20114538U1 (de) 2001-10-31
DE50206119D1 (de) 2006-05-11
ATE321212T1 (de) 2006-04-15

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