EP1375926B1 - Dispositif de commande hydraulique pour une machine de travail - Google Patents

Dispositif de commande hydraulique pour une machine de travail Download PDF

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Publication number
EP1375926B1
EP1375926B1 EP03013909A EP03013909A EP1375926B1 EP 1375926 B1 EP1375926 B1 EP 1375926B1 EP 03013909 A EP03013909 A EP 03013909A EP 03013909 A EP03013909 A EP 03013909A EP 1375926 B1 EP1375926 B1 EP 1375926B1
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EP
European Patent Office
Prior art keywords
cylinder
pressure
valve
safety valve
safety
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.)
Expired - Lifetime
Application number
EP03013909A
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German (de)
English (en)
Other versions
EP1375926A1 (fr
Inventor
Philippe Ostermann
Emmanuel Berthod
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
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Deere and Co
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Filing date
Publication date
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Publication of EP1375926A1 publication Critical patent/EP1375926A1/fr
Application granted granted Critical
Publication of EP1375926B1 publication Critical patent/EP1375926B1/fr
Anticipated expiration legal-status Critical
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • 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
    • 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
    • F15B2211/405—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
    • F15B2211/41—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
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8616—Control during or prevention of abnormal conditions the abnormal condition being noise or vibration
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8636—Circuit failure, e.g. valve or hose failure

Definitions

  • the invention relates to a hydraulic control arrangement for a mobile work machine, with at least one hydraulic cylinder, with the aid of 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, at least one between the directional control valve and the Pressure chamber of the cylinder looped safety valve which can be opened to adjust the cylinder, and with a pressure accumulator which is connectable to the pressure chamber of the cylinder on the cylinder side of the at least one safety valve.
  • Hoists such as front loaders, are mounted on vehicles and used for lifting and transporting loads. They have hydraulic cylinders for lifting and usually also for pivoting the load, which are supplied by releasable, flexible hoses from a carrier vehicle with pressurized hydraulic fluid. In order to prevent the load from falling down in the event of a hose break leading to the pressure drop in the cylinder holding the load, so-called load-holding or safety valves are used. These valves shut off the connection between the cylinder and the hose as long as the operator does not move the hoist.
  • the hydraulic cylinders of the hoists with serving as a vibration damper pressure accumulators, which are provided on the lifting or Absenkseite a cylinder or on both sides ( DE 197 34 658 A ).
  • Such pressure accumulators are connected to the vehicle-side connection point of the safety valves, since they are usually located on the vehicle and are connected by a hose to the safety valve.
  • the operator can deactivate the safety valve manually. He then takes responsibility for not performing any lifting operation. It is also conceivable to activate the safety valve depending on the speed of the vehicle. If with one is driven at a certain speed, it can be assumed that the vehicle is not in hoisting, but in transport mode. Then the pressure accumulator is effective only while driving.
  • the FR 2 052 052 A discloses a hydraulic control device for a hydraulic cylinder, which is in communication with two hydraulic accumulators and enable only one supply line by means of a combination of check valves, each communicating with a hydraulic accumulator, and a common pressure-controlled switching valve, a control of a hydraulic cylinder over extremely long distances should.
  • the check valves are safety valves, which are not switchable.
  • the US 5,921,010 A discloses a hydraulic arrangement for a working device, in particular for a hydraulically sprung clearing bucket.
  • the assembly includes a check valve which, in combination with a pressure limiting valve, constitutes a safety valve to maintain a presettable system pressure.
  • the safety valve or the check valve opens in the direction of a connected to a hydraulic tank and a hydraulic pump directional control valve and thus does not represent a hedge of a pressure drop in hose breakage.
  • the JP 59 073 602 A discloses a pressure compensating device for a hydraulic cylinder assembly.
  • a safety valve is used, which is openable for adjusting the cylinder via a pilot pressure line connected to the cylinder.
  • the disclosed pressure compensation device is limited to temperature-induced or leakage-induced pressure changes in the cylinder.
  • a hydraulic damping for the cylinder is not disclosed.
  • the object underlying the invention is seen to improve a lifting device with a safety valve to the effect that even with the safety valve off, a damping of the cylinder is possible, or that the safety valve is effective even with a damped cylinder remains.
  • a first and a second looped between the directional control valve and the pressure chamber of the cylinder safety valve is provided, one of the safety valves independently of the pressure in the chambers of the cylinder is electromagnetically remotely controllable switchable and wherein the safety valves a first switching position with a in Direction of the directional control valve closing check valve and a second switching position with a passage and are openable for adjusting the cylinder by switching from the first to the second switching position.
  • the accumulator is connected to the cylinder-facing side of the safety valve.
  • the accumulator can be connected directly or by a lockable, usually remotely controllable valve with the pressure chamber of the cylinder.
  • the valve allows to shut off the pressure accumulator if an operator would like to do without the exact positioning of the working tool on the effect of the pressure accumulator.
  • the pressure accumulator is expediently mechanically rigidly coupled to the cylinder and / or the safety valve, so that it moves with the cylinder and the safety valve and no hoses at risk of breakage are required.
  • the pressure accumulator is preferably exclusively by means of mechanically rigid Conduit elements, such as pipes and the like, connected to the pressure chamber of the cylinder. This avoids the risk of hose breaks, which would lead to the sudden drop in a load.
  • the line leading to the pressure accumulator may be connected to a second port of the pressure chamber of the cylinder, the first port of which is connected to the safety valve.
  • the pressure accumulator is integrated in the housing of the cylinder.
  • the hydraulic control arrangement according to the invention is explained using the example of a farm tractor with a front loader. However, it can be used on any work machine with movable work tools, such as wheel loaders, telescopic loaders, excavators and the like.
  • a hoist 10 shown in Figure 1 which is connected to the front of an agricultural tractor only hinted, a mast 12 is shown, which receives a lifting rocker 16 in a bearing 14, which is stiffened by means of a cross member 18 due to their double-armed design.
  • a working tool 20, z As a soil scoop, a Dunggabel, a bale fork or pallet fork is connected to the front end of the lifting rocker 16 by means of an adjusting device 30 and a tool holder 32 movable and replaceable.
  • the lifting rocker 16 is pivoted about the bearing 14 via hydraulic cylinders 26.
  • the adjusting device 30 acts on the tool holder 32, to which the working tool 20 is directly connected, and consists essentially of a first and a second pivot arm 34, 36, which are hinged together, wherein in the hinge point 44 of the cylinder 28 engages ,
  • the tool holder 32 is pivotally mounted in a bearing 38 and the first pivot arm 34 in a bearing 40 on the lifting rocker 16.
  • the second pivot arm 36 is pivotally connected to the tool holder 32 in a bearing 46. 48 is a latch for locking the working tool 20 is designated. In the upper portion of the tool holder 32, a hook 50 and a bolt 52 are provided, which bring the working tool 20 in engagement with the hoist 10.
  • FIG. 2 shows a diagram of a hydraulic control arrangement according to the invention for the working machine from FIG. 1 shown.
  • a pump as the pressure medium source 54 and a tank 56 for receiving a relaxed pressure medium are arranged.
  • the pump is connected to a coupling 62 via two directional control valves 58, 60 operable by the operator from the tractor cab.
  • the hydraulic connections of the hoist 10 are connected.
  • the single- or double-acting cylinder 26 are connected via the coupling 62 directly to the directional control valve 60, so that the working tool 20 can be raised and lowered by operating the directional control valve 60 in a conventional manner.
  • the other cylinders 28, however, are double-acting. Your piston chamber 64 is acted upon to pivot the working tool 20 upwards. Similarly, its piston rod chamber 66 is acted upon when the working tool 20 is to be pivoted downwards.
  • the per se known safety valve block 68 is provided in order to prevent inadvertent lowering of the working tool 20, if a flexible hose should break, which is arranged between the coupling 62 and the safety valve block 68 connected to the piston chamber 64.
  • the safety valve block 68 is provided with two cylinder-side connections, to each of which a piston chamber 64 of the cylinder 28 is connected.
  • the safety valve block 68 contains in each case a safety valve 70, 72 for the two possible directions of pressure flow.
  • the first safety valve 70 contains a check valve which opens when the pressure in the piston chamber 64 is less than the pressure at the associated connection of the coupling 62. It opens automatically, when the operator increases the pressure in the piston chamber 64 by operating the directional control valve 58. By an electromagnetic remote control, it is possible to switch the first safety valve 70 between the check valve and a passage, so that the safety valve 70 is switchable to constant passage.
  • the second safety valve 72 also includes a check valve that corresponds to that in the safety valve 70. Controlled by the pressure in the chambers 64, 66, the second safety valve can switch between the check valve and a passage.
  • the passage is thus automatically opened when the pressure in the piston rod chamber 66 is greater than the pressure in the piston chamber 64, ie, the cylinder 28 is to contract so that the pressure fluid from the piston chamber 64 can flow into the tank 56.
  • the safety valves 70, 72 are opened as a result, when the operator via the directional control valve 58 causes a movement of the cylinder 28 and otherwise closed.
  • the piston chamber of the right-hand cylinder 28 has two ports 76, 78.
  • the first port 76 is connected to the safety valve block 68.
  • a pneumatic pressure accumulator 74 is connected to the second connection 78 by rigid conduit elements. Mechanically, the pressure accumulator 74 is attached to the lifting rocker 16 or the cylinder 28.
  • the pressure accumulator 74 provides a permanent damping of the right-hand cylinder 28 and the first port 76 and the rigid connection 90 of the left-hand cylinder 28, even with closed safety valves 70, 72.
  • the accumulator 74 could also in the housing of the cylinder 28 close be arranged on the bottom side.
  • a second pneumatic accumulator 80 is connected to the piston rod chambers 66 of the cylinders 28 to provide further cushioning of the cylinders 28. Since the piston rod chambers 66 are safe in terms of safety because a pressure drop in them does not lead to a drop in the working tool 20, safety valves assigned to them are unnecessary.
  • the second pressure accumulator 80 may be attached to the lifting rocker 16 or to the frame of the tractor, flexible hoses are used.
  • FIG. 3 schematically shows a second embodiment of a hydraulic control arrangement. Elements that match the first embodiment are identified by the same reference numerals.
  • the two cylinders 28 are each assigned a safety valve block 68. Therefore, each cylinder 28 is also provided with a second port 78 and one thereon connected pressure accumulator 74, 74 'provided.
  • a common pressure accumulator 80 is provided for the piston rod side of the cylinder 28 but, as in the embodiment of Figure 2, only a common pressure accumulator 80 is provided.
  • the third embodiment of a hydraulic control arrangement according to the invention shown in FIG. 4 differs from that according to FIG. 3 in that the cylinders 28 have only a single connection 76 and that the pressure accumulators 74, 74 'are each connected to a connection 82 of the associated safety valve block 68 , The port 82 is connected to the port 76 within the safety valve block 68. This saves you the second port 78 of the cylinder 28th
  • FIG. 5 schematically shows a fourth embodiment of a hydraulic control arrangement according to the invention. It essentially corresponds to the embodiment according to FIG. 3, but the pressure accumulators 74, 74 ', 80 can be switched off by valve arrangements 84.
  • the valve assemblies 84 include check valves 86 which open if the pressure in the pressure accumulator 74, 74 ', 80 is less than the pressure in the associated cylinder chamber. This prevents unwanted movements of the cylinder 28 when you turn on the accumulator.
  • valve assemblies 84 include electromagnetic remotely controllable directional control valves 88 which are movable between a passage position in which the pressure accumulators 74, 74 ', 80 are connected to the associated cylinder chambers, and a blocking position in which the pressure accumulators are separated from the cylinder chambers.
  • the valve assemblies 84 allow the pressure accumulators to be shut off if the operator desires to adjust the work tool 20 with increased accuracy.
  • the cylinder 26 could also be cushioned by pressure accumulators as shown.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Claims (5)

  1. Dispositif de commande hydraulique pour une machine de travail mobile, comprenant au moins un cylindre (28) hydraulique, à l'aide duquel un outil de travail (20) peut être déplacé, une soupape à canaux (58) pour la commande de la course d'agent de pression entre un espace de pression du cylindre (28), une source d'agent de pression (54) et un réservoir (56), au moins une soupape de sécurité (70, 72) rodée entre la soupape à canaux (58) et l'espace de pression (64) du cylindre (28), qui peut être ouverte pour le déplacement du cylindre (28), et avec un accumulateur de pression (74, 74'), qui peut être relié à l'espace de pression (64) du cylindre (28) sur le cylindre d'au moins une soupape de sécurité (70, 72), caractérisé en ce qu'une première et une seconde soupapes de sécurité (70, 72) rodées entre la soupape à canaux (58) et l'espace de pression (64) du cylindre (28) sont prévues, l'une des soupapes de sécurité (70) pouvant être commutée de façon électromagnétique avec possibilité de télécommande indépendamment de la pression dans les chambres (64, 66) du cylindre (28) et les soupapes de sécurité (70, 72) contenant une première position de commutation avec une soupape anti-retour fermant en direction de la soupape à canaux (58) et une seconde position de commutation avec un passage et pouvant être ouverte pour le réglage du cylindre (28) par la commutation de la première dans la seconde position de commutation.
  2. Dispositif de commande selon la revendication 1, caractérisé en ce que l'accumulateur de pression (74, 74') est relié directement ou par une soupape (88) obturable, en particulier télécommandable, à l'espace de pression (64) du cylindre (28).
  3. Dispositif de commande selon la revendication 1 ou 2, caractérisé en ce que l'accumulateur de pression (74, 74') n'est relié que par des éléments de conduite rigides au plan mécanique à l'espace de pression (64) du cylindre (28).
  4. Dispositif de commande selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'accumulateur de pression (74, 74') est relié à un second branchement (78) de l'espace de pression (64) du cylindre (28).
  5. Dispositif de commande selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'accumulateur de pression (74, 74') est relié à un branchement (82) d'un bloc de soupape de sécurité (68) contenant les soupapes de sécurité (70, 72).
EP03013909A 2002-06-22 2003-06-20 Dispositif de commande hydraulique pour une machine de travail Expired - Lifetime EP1375926B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10227966 2002-06-22
DE10227966A DE10227966A1 (de) 2002-06-22 2002-06-22 Hydraulische Steueranordnung für eine mobile Arbeitsmaschine

Publications (2)

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EP1375926A1 EP1375926A1 (fr) 2004-01-02
EP1375926B1 true EP1375926B1 (fr) 2007-12-05

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EP03013909A Expired - Lifetime EP1375926B1 (fr) 2002-06-22 2003-06-20 Dispositif de commande hydraulique pour une machine de travail

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US (1) US6951103B2 (fr)
EP (1) EP1375926B1 (fr)
AT (1) ATE380297T1 (fr)
CA (1) CA2433120C (fr)
DE (2) DE10227966A1 (fr)

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DE102004056418B4 (de) * 2004-11-23 2013-02-28 Deere & Company Hydraulische Anordnung
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Also Published As

Publication number Publication date
US6951103B2 (en) 2005-10-04
ATE380297T1 (de) 2007-12-15
CA2433120C (fr) 2007-02-27
CA2433120A1 (fr) 2003-12-22
EP1375926A1 (fr) 2004-01-02
DE50308718D1 (de) 2008-01-17
US20040006980A1 (en) 2004-01-15
DE10227966A1 (de) 2004-01-08

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