EP1507087A2 - Dispositif de commande hydraulique pour une machine de travail mobile - Google Patents

Dispositif de commande hydraulique pour une machine de travail mobile Download PDF

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Publication number
EP1507087A2
EP1507087A2 EP04103586A EP04103586A EP1507087A2 EP 1507087 A2 EP1507087 A2 EP 1507087A2 EP 04103586 A EP04103586 A EP 04103586A EP 04103586 A EP04103586 A EP 04103586A EP 1507087 A2 EP1507087 A2 EP 1507087A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
safety valve
pressure
valve
control arrangement
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.)
Withdrawn
Application number
EP04103586A
Other languages
German (de)
English (en)
Inventor
Emmanuel Berthod
Philippe Ostermann
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP1507087A2 publication Critical patent/EP1507087A2/fr
Withdrawn legal-status Critical Current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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • 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
    • F15B11/003—Systems with load-holding 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
    • F15B2211/20—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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check 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
    • F15B2211/30—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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31588—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and multiple output members
    • 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
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/40—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
    • F15B2211/41545—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 being connected to multiple output members
    • 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
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Definitions

  • the invention relates to a hydraulic control arrangement for a mobile work machine, with at least one hydraulic Cylinder, with the help of which a working tool is movable, a directional control valve for controlling the pressure medium path between a Pressure chamber of the cylinder, a pressure medium source and a tank, and one between the directional control valve and the lifting of the Working tool applied pressure chamber of the cylinder looped safety valve, which occurs when exposed of the cylinder opens automatically and not acted upon Cylinder is locked.
  • Hoists such as front loaders, are mounted on vehicles and used for lifting and transporting loads. she have hydraulic cylinders for lifting and usually also for pivoting the load on, by releasable, flexible Hoses from a host vehicle with pressurized Hydraulic fluid to be supplied. To prevent the load in the case of a hose break, which causes the pressure in the the load-holding cylinder leads, falls down, so become mentioned safety or load-holding valves used (see DE 100 06 908 A). These valves block the connection between the Cylinder and hose off, as long as the operator does not move of the hoist.
  • Safety valve Check valve that allows a filling of the pressure chamber.
  • the safety valve depending on the Pressure difference between the safe pressure chamber of the double acting cylinder and the other pressure chamber.
  • Safety valves are used in particular on hoists of excavators, Earthmoving machines, forklifts and agricultural Loaders used.
  • A is another hydraulic control arrangement proposed in the one Cylinder is associated with a first safety valve, through remotely bring an operator into an open position is.
  • a second safety valve is provided by the Pressure difference between the two pressure chambers of the double acting cylinder opened when the working tool lowered becomes.
  • Safety valves often have different sensitivities on, allowing them while lowering the implement do not open synchronously, which causes the cylinders not lowered synchronously and the implement when lowering wavers or wobbles.
  • a swimming mode in which the chambers of a double acting cylinder are fluid-conductively connected to each other, is with the known safety valves not possible, as they always are locked, if the cylinder is not adjusted.
  • a second valve is provided for this purpose, but this is the effort and the risk of a line break increased.
  • the object underlying the invention is seen therein to provide a hydraulic control arrangement that the mentioned disadvantages or not to a lesser extent.
  • the Safety valve also opens automatically when the operator has selected a swim mode. Then that's it Work tool usually lowered and lies on the ground or any other support surface, although it is also conceivable would be, this mode for special applications even with a to activate raised work tool.
  • the safety valve remains the pressure in the pressure chamber of the Cylinder is preferably disregarded, although also embodiments would be conceivable in which it is taken into account.
  • One The advantage is that in this way one - for example suitable for ground copying - swimming mode is possible, in the acted upon for lifting the working tool Pressure chamber and a second pressure chamber of the double-acting Cylinder over the spent in a floating position valve and the opened safety valve are connected together. They are usually also connected to the tank.
  • a first embodiment is a second pressure chamber of a double-acting cylinder Lowering applied with pressure medium. Based on this pressure can the safety valve can be controlled and opened, if necessary the pressure is either using the safety valve directly a control cylinder actuated or indirectly by passing over a Pressure sensor (eg pressure switch) is detected, whose Output signal to the electromagnetic or hydraulic Control of the safety valve is used.
  • a Pressure sensor eg pressure switch
  • the safety valve based on an operator input electromagnetic or hydraulically controlled.
  • the operator input can be detected directly be, for example, by a switch contact on a Operator input device, or indirectly, by the position an element influenced by the operator input device, z. B. the directional control valve, is detected.
  • Single or double acting cylinders can be used.
  • the inventive hydraulic control arrangement is on Example of a tractor with front loader explained. She can, however on any work machines with moving work tools used as wheel loaders, telehandlers, and excavators like. From a hoist 10 shown in Figure 1, the Front connected to a tractor only indicated, a mast 12 is shown in a bearing 14 a Lifting rocker 16 receives, due to their double-armed Execution stiffened by means of a tubular cross member 18 becomes.
  • a working tool 20, z. B. a soil scoop, a dung fork, a bale fork or pallet fork is on the front End of the lifting rocker 16 by means of an adjusting device 30 and a tool holder 32 movably and interchangeably connected.
  • the lifting rocker 16 pivoted about the bearing 14 via two hydraulic cylinders 28.
  • To adjust the inclination of the working tool 20 engages the Actuator 30 one end and the lifting arm 16 other End of another hydraulic cylinder 26 at.
  • On both sides the lifting rocker 16 are each a cylinder 26 and 28 are arranged.
  • the Actuator 30 acts on the tool holder 32 to which the Work tool 20 is connected directly, and sits in the Essentially of a first and a second pivot arm 34, 36 together, which are hinged together, being in the Joint 44 of the cylinder 26 attacks.
  • the tool holder 32 is in a bearing 38 and the first Swivel arm 34 in a bearing 40 on the lifting rocker 16 pivotally stored.
  • the second pivot arm 36 is in a bearing 46 pivotally connected to the tool holder 32.
  • At 48 is one Latch for locking the working tool 20 denotes. in the upper portion of the tool holder 32 are a hook 50 and a Bolt 52 is provided, which engages the working tool 20 with bring the hoist 10.
  • FIG. 2 is a diagram of a hydraulic according to the invention Control arrangement for the working machine from FIG. 1 shown.
  • a pump as a source of pressure medium 54 and a tank 56 for receiving relaxed Arranged pressure medium.
  • the pump is over two from the operator of the cab of the tractor from actuatable directional valves 58, 60 with a coupling 62 connected.
  • actuatable directional valves 58, 60 with a coupling 62 connected.
  • the Hydraulic connections of the hoist 10 connected.
  • the double Acting cylinder 26 are connected via the coupling 62 directly to the Directional valve 60 connected, so that the working tool 20 through Actuation of the directional control valve 60 in a conventional manner can be pivoted.
  • the cylinders 28 are double-acting. They are about flexible Hoses 63, 65 and the coupling 62 with the directional control valve 58th connected. Your piston chamber 64 is applied to the Lifting rocker 16 with the working tool 20 upwards pivot. Analogously, its piston rod chamber 66 acted upon when the lifting rocker 16 with the working tool 20th should be pivoted down. To an unintentional To prevent lowering of the working tool 20, if one flexible hose 63, 65 should break, between the Coupling 62 and one connected to the piston chamber 64 Safety valve block 68 is arranged, is the safety valve block 68 provided. The safety valve block 68 is with two cylinder-side connections provided, to each of which one Piston chamber 64 of the cylinder 28 is connected. Of the Safety valve block 68 is directly on the right in Figure 2 marked cylinder 28 attached. The left in Figure 2 drawn, spaced from the safety valve block 68 Cylinder 28 is connected by a rigid line 76 with the Safety valve block 68 connected.
  • the safety valve block 68 includes a safety valve 70.
  • the safety valve 70 includes a check valve 72, the opens when the pressure in the piston chamber 64 is smaller than that Pressure at the associated connection of the coupling 62. It thus opens automatically when the operator through the pressure in the piston chamber 64 through Actuation of the directional valve 58 increases.
  • the safety valve 70 is from the position shown in Figure 2, in which the Check valve 72 between the associated port on the Coupling 62 and the piston chamber 64 is inserted, in a second Position occupying, in the place of the check valve 72, a passage 74 occurs.
  • the safety valve 70 is through a spring 80 in the position shown in Figure 2 biased. It is controlled by a control cylinder 78, whose Piston chamber pressure-conducting with the piston rod chamber 66th of the cylinder 28 is connected between the two mentioned Positions moved.
  • the mode of operation of the control arrangement shown in FIG is the following:
  • the safety valve 70 is in the cases where a Security risk exists, d. H. in the stroke position 82 and in the holding position 84, active: the check valve 72 is inserted between the piston chamber 64 and the tube 65.
  • the check valve 72 is inserted between the piston chamber 64 and the tube 65.
  • One possible breakage of the tube 65 thus does not lead to a unintentional lowering of the working tool 20.
  • In the lowered position 86 can be assumed, however, that no people are under the working tool 20 so that then a hedge of the hose 65 against fractures is unnecessary.
  • In the passage position of the safety valve 70 are relative large flow rates possible, making the working tool 20 right can be lowered quickly.
  • FIG 3 is a second embodiment of an inventive Control arrangement shown in construction and function essentially corresponds to that of Figure 2.
  • the first Embodiment corresponding elements are the same Reference number marked.
  • the difference to the first Embodiment is that each cylinder 28 a Safety valve 70 is assigned.
  • this embodiment makes it particularly advantageous that the Switching the safety valves 70 in the passage position regardless of the pressure in the piston chambers 64, so that different movements of both cylinders 28 when lowering, the lead to the shaking of the working tool 20, not to fear are.
  • FIG. 4 shows a third embodiment of a device according to the invention Control arrangement shown.
  • the first embodiment corresponding elements are identified by the same reference numerals.
  • the safety valve 70 is not here hydraulically, but electromagnetically actuated. This is one electromagnetic actuator 90 with the safety valve 70 connected.
  • the actuator 90 may be connected to the directional control valve 58 or a Be coupled operator input device and spends that Safety valve 70 in the position in which the passage 74th is located between the piston chamber 64 and the hose 65, when the directional control valve 58 in the lowered position 86 or in a Floating position is 88.
  • the directional control valve 58 is located in the stroke position 82 or in the holding position 84, is the Actuator 90 is deactivated and the spring 80 spends that Safety valve 70 in the position in which the check valve 72 disposed between the tube 65 and the piston chamber 64 is.
  • This will be the same function as in the first and second Embodiment realized.
  • the activation of the actuator 90 is with reference to the figures 6 to 8 described below.
  • the directional control valve 58 may additionally be brought into a floating position 88. There the hoses 63, 65 with each other and with the tank 56th connected. The control cylinder 78 is driven in such a way that the safety valve 70 also in the floating position 88 of the Direction valve 58 is spent in the forward position or in it remains so that the floating movement of the cylinder 28 possible becomes.
  • This floating position 88 allows the Work tool 20 with a constant force on the ground what to do, for example, in the demystaging of Stables or when harvesting a field with a beet aggregate allows you to follow the ground contours independently.
  • the inventive design of the safety valve 70 allows to select a float mode without additional valves.
  • FIG. 5 is a fourth embodiment of an inventive Control arrangement shown in construction and function essentially corresponding to that of FIG. 4.
  • the before discussed embodiments corresponding elements are with the same reference numerals.
  • the difference to Embodiment of Figure 4 is that only a single Safety valve 70 is provided, directly to one of Cylinder 28 is fixed and its output by a rigid Line 76 is connected to the other cylinder 28.
  • Figures 6 to 8 show embodiments of arrangements for Actuation of the electromagnetic actuator 90, which in the Embodiments of Figures 4 and 5 can be used.
  • an operating element 92 in Form of a so-called joystick which is used to control the Directional valve 58 is used and at its top a handle 94th by an operator in the cab of the tractor is manageable, a series of cables 96 on which to electromagnetic control of the directional control valve 58 is provided are. Based on the voltage applied to the cables 96 voltages by means of a suitable electronic control of the actuator 90th controlled.
  • the figure 6b can also be an independent Switch 98 can be arranged in the cabin, with a handle 100 is equipped, which serves to drive the actuator 90.
  • the embodiment according to FIG. 7 uses a switch 102, which is mechanically actuated by the directional control valve 58. Is the directional control valve 58 in one of the positions 86 or 88, the switch 102 is turned on, in turn, the actuator 90 activated. In contrast, the directional control valve 58 is located in the Position 82 or 84, are the switch 102 and the actuator 90 switched off.
  • the switches 98 or 102 may be the actuator 90 according to FIG. 8 via a control that a battery 104, a Fuse 106 and a relay 108 and a spark suppression diode 106th having. If the switch 98 or 102 is closed, flows through the winding of the relay 108 via the fuse 106 and the Spark-extinction diode 110 a current, so the switch of the relay 108 and also from the battery 104, in which it is usually the battery of the tractor, fed Actuator 90 is activated. When opening the switch 98, 102 prevents the spark suppression diode 110, which also serves as an antiparallel diode be switched parallel to the winding of the relay 108 could, unwanted sparks on the switch 98, 102nd
  • Figure 9 shows a fifth embodiment of a Control arrangement, which in structure and function essentially the Control arrangement of Figure 4 corresponds.
  • the embodiment according to Figure 4 corresponding elements are denoted by the same reference numerals characterized.
  • the control of the safety valves 70 takes place however by a hybrid, hydraulic / electromagnetic Control. This is the hose 63, with the Piston rod chamber 66 is connected, with pressure medium a pressure switch 112 connected.
  • the pressure switch 112 includes a switching contact 114, which in one by means of a adjustable spring 116 adjustable pressure in the hose 63 a or turns off.
  • the switching contacts 114 are analogous to Circuit in Figure 8, via a fuse 106, the winding of a Relay 108 and a spark extinguishing diode 110 with a battery 104th connected, which is also usually the battery of the Tractor trades.
  • the actuator 90 of the safety valve 70 is controlled by the switching contact of the relay 108.
  • the mode of operation of the control arrangement according to FIG. 9 corresponds of the embodiments of Figures 2 and 3: Is that Directional valve 58 in the stroke position 82 or in the holding position 84, a relatively low pressure is applied to the pressure switch 112, which is not sufficient, the switching contact 114 against the force of Close spring 116. The relay 108 therefore remains de-energized, so that also the actuators 90 are not energized.
  • the Safety valves 70 remain in the one shown in FIG Position in which the check valves 72 between the Hose 65 and the piston chambers 64 are located. Will that be Way valve 58, however, spent in the lowered position 86, the pressure on the pressure switch 112 increases, so that the Switch contact 114 against the force of the spring 116 closes.
  • Safety valve 70 are connected to both cylinders 28, analogous to the embodiments of Figures 2 and 5.
  • pressure switch 114 on the tractor side of the Coupling 62 may be arranged, with a pluggable or wireless (Radio, optical, etc.) connection with the safety valve 70 could be provided.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
EP04103586A 2003-08-09 2004-07-27 Dispositif de commande hydraulique pour une machine de travail mobile Withdrawn EP1507087A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10336684A DE10336684A1 (de) 2003-08-09 2003-08-09 Hydraulische Steueranordnung für eine mobile Arbeitsmaschine
DE10336684 2003-08-09

Publications (1)

Publication Number Publication Date
EP1507087A2 true EP1507087A2 (fr) 2005-02-16

Family

ID=33560287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04103586A Withdrawn EP1507087A2 (fr) 2003-08-09 2004-07-27 Dispositif de commande hydraulique pour une machine de travail mobile

Country Status (4)

Country Link
US (1) US20050044849A1 (fr)
EP (1) EP1507087A2 (fr)
CA (1) CA2476660A1 (fr)
DE (1) DE10336684A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056381A1 (de) * 2004-11-23 2006-05-24 Deere & Company, Moline Druckmittelbetriebene Anordnung
JP4353190B2 (ja) * 2006-02-27 2009-10-28 コベルコ建機株式会社 建設機械の油圧回路
DE102008008092A1 (de) * 2007-11-28 2009-06-04 Robert Bosch Gmbh Ventilanordnung
US7827787B2 (en) 2007-12-27 2010-11-09 Deere & Company Hydraulic system
UA110988C2 (uk) 2011-08-05 2016-03-10 Пресіжн Плентінг Елелсі Пристрій, системи і способи регулювання притискної сили рядного висівного апарата
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DE10336684A1 (de) 2005-03-03
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