EP0906515A1 - Commande pilote pour deux distributeurs a commande hydraulique - Google Patents

Commande pilote pour deux distributeurs a commande hydraulique

Info

Publication number
EP0906515A1
EP0906515A1 EP97929187A EP97929187A EP0906515A1 EP 0906515 A1 EP0906515 A1 EP 0906515A1 EP 97929187 A EP97929187 A EP 97929187A EP 97929187 A EP97929187 A EP 97929187A EP 0906515 A1 EP0906515 A1 EP 0906515A1
Authority
EP
European Patent Office
Prior art keywords
control
valve
pilot
directional
pressure chamber
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.)
Ceased
Application number
EP97929187A
Other languages
German (de)
English (en)
Inventor
Alfred Breunig
Dieter Roth
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.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth AG
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
Priority claimed from DE19630798A external-priority patent/DE19630798A1/de
Application filed by Mannesmann Rexroth AG filed Critical Mannesmann Rexroth AG
Publication of EP0906515A1 publication Critical patent/EP0906515A1/fr
Ceased legal-status Critical Current

Links

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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open 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
    • F15B2211/3144—Directional 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
    • F15B2211/50—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
    • F15B2211/50527—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 using cross-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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/67—Methods for controlling pilot pressure

Definitions

  • the invention is based on a pilot control, which is provided for two hydraulically actuated directional control valves and has the features from the preamble of claim 1 or the independent claim 2.
  • a pilot control according to the preamble of claim 1 is known for example from DE 39 19 640 A1 or DE 38 12 753 A1.
  • the pilot controls shown in these documents include one or more pilot devices which operate on the basis of directly controlled pressure reducing valves.
  • Each pressure reducing valve has a control output which can be connected or connected to exactly one control pressure chamber of one of several directional control valves. Accordingly, the number of pressure reducing valves and the number of control lines leading from the pilot control devices to the directional valves coincide with the number of control pressure spaces at the various directional valves.
  • Hydraulic pilot control devices which have four pressure valves and a hand lever which can be deflected in all directions from a neutral position in which none of the pressure valves is actuated.
  • a pilot control device of this type a maximum of two directional control valves, each with two control pressure chambers, can be actuated in the previously known types of pilot controls.
  • a third directional control valve is added, two more pressure valves and another hand lever are used, which can be swiveled in a single plane.
  • Hydraulic pilot control devices are also known, which are additionally equipped with an electrical switch, which is preferably arranged in the handle of the hand lever. With the electrical switch, additional valves can be operated using an electrical actuator.
  • the preamble of claim 2 is based on an electro-hydraulic pilot control.
  • an electrical pilot control device is used, with which electrically, in particular electromagnetically actuated pilot control valves can be controlled.
  • the pilot valves are relatively expensive pressure valves, in particular pressure reducing valves, and are usually located directly on the respective directional valve.
  • an electromagnetically actuated pilot valve is a so-called cartridge valve with a cartridge that fits into a bore a cover of the directional control valve is installed.
  • An electro-hydraulic pilot control of a directional valve with an electromagnetically actuable pilot valve is known from data sheet RE 64380 / 03.94 from Mannesmann Rexroth GmbH.
  • the aim of the invention is to design a pilot control for several directional control valves so that the effort for the control of the directional control valves can be kept lower and the associated costs can be kept lower.
  • the changeover valve can be arranged in the pilot control device, close to the directional control valves or directly at these, so that, if it can be actuated electrically, a hydraulic control line to the directional control valves is omitted.
  • An electrical control line is cheaper and easier to lay.
  • the number of pilot devices can be reduced or a simpler pilot device can be used. In particular, the number of relatively expensive pilot valves designed as pressure valves is reduced.
  • an electromagnetically actuated changeover valve is present which has a control output of a pilot valve in its first switching position with a control pressure chamber of the first directional valve and in its second switching position with a control pressure chamber of the second directional valve.
  • a relatively expensive pressure valve is therefore replaced by a simple changeover valve, so that this alone can reduce the costs.
  • the pilot control unit is also simplified.
  • both directional valves each have two control pressure spaces, it is advantageous a second control output can be connected by switching a valve with a control pressure chamber on one directional valve or with a control pressure chamber on the other directional valve.
  • a second, in particular electromagnetically actuated, switching valve which connects the second control output in its first switching position to a second control pressure chamber of the first directional valve and in its second switching position to a second control pressure chamber of the second directional valve.
  • a changeover valve in principle, it is conceivable to actuate a changeover valve only when there is no pressure at the corresponding control output, ie when the hand lever of the pilot control device is in the zero position. Then a 3/2-way valve can be used as a changeover valve, which in one switching position only blocks a control pressure chamber of the hydraulically controlled directional valve.
  • a changeover valve in a switching position connects the control pressure chamber of the one way valve with the control output and the control pressure chamber relieved of the other way valve to the tank.
  • the electromagnet of a changeover valve can preferably be switched on and off by manual actuation of an electrical switch.
  • an electrical switch can be used which is integrated in the pilot control device.
  • the changeover valve is located directly on or in the housing of a directional valve. This makes the hydraulic connections to the control chambers particularly short.
  • the changeover valve is arranged on a cover closing a piston bore of the directional valve.
  • a 3/2-way valve or a 4/2-way valve that is used as a changeover valve can also be replaced by several individual valves that have fewer than three or four connections.
  • the function of a 3/2-way valve can also be fulfilled by two 2/2-way valves or the function of a 4/2-way valve by two 3/2-way valves.
  • Such solutions are also considered to be covered by the claims.
  • a solution in which switching is carried out using only a single valve is particularly preferred since it is less expensive and requires less installation space than a solution. solution with several individual valves.
  • FIG. 1 shows a circuit diagram of the first exemplary embodiment, which contains a hydraulic pilot control device
  • FIG. 2 shows the structural design of the first exemplary embodiment in the region of the cover of a directional valve in which a changeover valve is installed
  • FIG. 3 shows a circuit diagram of a second exemplary embodiment, in which the directional control valves are controlled electro-hydraulically
  • FIG. 4 shows a circuit diagram of the third exemplary embodiment, in which the directional control valves are also controlled electro-hydraulic.
  • FIG. 1 shows three proportional directional control valves 10, 11, 12, which are combined to form a so-called monoblock 13 and have a common housing 14 into which the three valve bores for the directional control valves are made. Each valve bore is closed on both sides by a cover 15, as can be seen in FIG. 2.
  • the mono block 13 is intended for installation in a wheel loader, the directional control valve 10 being actuated when the lifting arms of the wheel loader are to be raised or lowered, the directional control valve 11 is actuated for tilting the bucket and the directional control valve 12 for executing a additional optional or an alternative function available for tilting the bucket.
  • each directional control valve 10, 11 or 12 has a circulation channel through which the entire amount of pressure medium flows from a pressure connection P to a tank connection T of the monoblock 13 when all directional control valves are in their central position. If a directional control valve is moved out of its central position, the circulation channel is throttled so that a pressure can be built up and a load can be moved.
  • control pressure chamber 17 or 18 In front of each end face of the valve piston 16 of a directional control valve there is a control pressure chamber 17 or 18 which can be acted upon by a control pressure in order to displace the spring-centered valve piston 16.
  • Control rooms 17 and 18 of the two-way Valves 10 and 12 are connected to control connections a1, b1, a3 and b3 of the monoblock 13 via control channels 19 and 20 running in the housing 14.
  • the control pressure chambers 17 and 18 of the directional control valve 11 are each preceded by a changeover valve 22 which can be actuated by an electromagnet 21 and has four connections.
  • a changeover valve 22 In a rest position, which a changeover valve 22 assumes under the action of a compression spring 23, this connects a control connection a2 or b2 of the monoblock 13 to the control pressure chamber 17 or 18 of the directional control valve 11. It also connects a control connection X1, which is connected via a short external one Control line 24 is connected to the control connection a1 or b1, with a tank channel 25 of the monoblock. After actuation by the electromagnet 21, a changeover valve 22 connects the control pressure chamber 17 or 18 of the directional control valve 11 to the tank channel 25 and the control connection a2 or b2 to the control connection a1 or b1 of the directional control valve 12.
  • Each changeover valve 22 is designed as a built-in cartridge and installed in a built-in bore 30 of a cover 15.
  • four sections can be distinguished on the outside, each of which is separated from one another by sealing rings. These four sections can be regarded as connections of the changeover valve.
  • a first section is located in front of the end face 32 of the valve housing 31 and is open to the control pressure chamber 17.
  • the other three sections are each designed as annular spaces located between the valve housing 31 and the wall of the bore 30.
  • An annular space 33 is closest to the end face 32 of the valve housing 31, from which a channel 34 leads to the parting plane between the housing 14 and the cover 15 and from there continues to the tank channel 25 running in the housing 14.
  • the annular space 33 is followed by an annular space 35, from which a channel 36 leads to the outside of the cover 15 facing away from the housing 14. Finally, the annular space 35 is followed by an annular space 37 which is connected via a channel 38 to the same outside of the cover 15.
  • the mouth of the channel 36 on the outside of the cover 15 is identical to the control connection a2 and the mouth of the channel 38 is identical to the corresponding control connection X1 of the monoblock 13 according to FIG. 1.
  • valve housing 31 From the rooms 17, 33, 35 and 37, bores lead through the valve housing 31 into a central valve bore 39, in which a valve piston 40 is axially displaceable.
  • the connections between the control pressure chamber 17, the tank line 25, and the control connections a2 and X1 can be established via this valve piston.
  • the directional control valves 10, 11 and 12 can be actuated with the aid of a hydraulic pilot control device 51 which contains four pressure reducing valves 52, 53, 54, 55 which can be adjusted by a single hand lever 56 which can be moved on all sides.
  • a hydraulic pilot control device 51 which contains four pressure reducing valves 52, 53, 54, 55 which can be adjusted by a single hand lever 56 which can be moved on all sides.
  • a pump 57 supplies the pilot control unit 51 with control oil via its input P, to which all four pressure reducing valves are connected.
  • a control output 58, 59, 60 or 61 of the pilot control device 51 is also assigned to each pressure reducing valve. By connection to the input P or to a tank connection T of the pilot device 51, a certain pressure can be adjusted in a control output.
  • the control output 58 is via a control line 62 to the control connection a3, the control output 59 via a control line 63 to the control connection b3, the control output 60 via a control line 64 to the control connection b2 and the control output 61 via a control line 65 to the control connection a2 of the monoblock 13 connected.
  • the pilot control device 51 is also equipped with an electrical switch 70, which is normally open and can be closed by hand in order to apply voltage to the two electromagnets 21 of the changeover valves 22.
  • an electrical switch 70 is usually integrated into the handle of the hand lever 56. It can be designed as a button that automatically returns to its rest position when released, or as a rocker switch that remains in its respective position after actuation.
  • the control output 61 of the pilot control unit is connected to the control pressure chamber 17 and the control output 60 of the pilot control unit is connected to the control pressure chamber 18 of the directional control valve 11.
  • a control pressure can thus alternatively be built up in the control pressure chamber 17 or in the control pressure chamber 18 of the directional control valve 11 and the valve piston 16 can thus be shifted from its central position in one or the other direction.
  • the displacement path depends on the level of the pilot pressure.
  • the control pressure chambers 17 and 18 of the directional control valve 12 are connected to the tank line 25 via the changeover valves 22 and thus relieved of pressure.
  • the electrical switch 70 If the electrical switch 70 is now closed, the electromagnets 21 attract and bring the changeover valves 22 into their other switching position. Then the control outputs 60 and 61 of the pilot device 51 are connected to the control pressure chambers 17 and 18 of the directional control valve 12, so that its Valve piston can be moved out of its central position. If the hand lever 56 assumes its zero position with respect to the pressure reducing valves 54 and 55, the two valve pistons of the directional control valves 11 and 12 are in their central position. If the electrical switch 70 is closed at this moment, the valve piston of one directional control valve can then be moved while the other remains in its central position.
  • the hand lever 56 is deflected with respect to a pressure reducing valve 54 or 55 at a point in time at which the electrical switch 70 is closed or opened, the valve piston of the one-way valve 11 or 12 is out of it when the electrical switch 70 is actuated Middle position shifted because a pilot pressure is present in the control pressure chamber 17 or 18.
  • this control pressure chamber is relieved of pressure so that the valve piston of the directional control valve actuated prior to actuation of the electrical switch 70 returns to its central position and the corresponding hydraulic consumer comes to a standstill.
  • the directional control valves 10, 11 and 12 are actuated electro-hydraulically.
  • a pilot control unit 75 and two pressure reducing valves 77 which are continuously adjustable by an electromagnet 76, are provided, which correspond to the pressure reducing valves 54 and 55 of the embodiment according to FIG. 1, but are not arranged in the pilot control unit, but rather directly on the directional control valve 11.
  • Each pressure reducing valve 77 has a pressure input which is connected to a port X of the directional valve 11, a tank outlet which is connected to a port Y of the directional valve 11, and a control output 78.
  • Each control output 78 of a pressure reducing valve 77 is a through an electromagnet 21 switchable valve 22 connected with four connections.
  • a changeover valve 22 in a rest position which it assumes under the action of the compression spring 23, connects the control outlet 78 of the associated pressure reducing valve 77 to the control pressure chamber 17 or 18 of the directional control valve 11. It also connects the control pressure chamber 17 or 18 of the directional control valve 12 with a tank channel Y.
  • a changeover valve 22 connects the control pressure chamber 17 or 18 of the Directional control valve 11 with the tank channel Y and the control pressure chamber 17 or 18 of the directional control valve 12 with the control outlet 78 of the corresponding pressure reducing valve 77.
  • the solenoid valves 22 and 77 are connected to the pilot control unit 75 via corresponding electrical lines. There is only a single line for the two electromagnets 21 of the changeover valves 22, via which the two electromagnets 21 act simultaneously. to be controlled.
  • all four solenoid valves 22 and 77 are locally assigned to the directional valve 11. There is in each case a pressure reducing valve 77 and a changeover valve 22 in a cover which closes the valve bore for the valve piston of the directional control valve 11.
  • One working output of a changeover valve 22 is connected directly to the control pressure chamber 17 or 18 of the directional control valve 11.
  • a control line 24 leads from the other working outlet to the control pressure chamber 17 or 18 of the directional control valve 12, this control line being able to run outside corresponding to the control lines 24 from FIG. 1 or inside the housing 14 of the monoblock 13, as shown in FIG. 3.
  • a pressure reducing valve 77 installed in a cover of the directional control valve 11 leads from the control outlet 28 a control line 79 outside or inside the housing 14 of the monoblock 13 to an input of a changeover valve 22 installed in a cover of the directional control valve 12. Its working output is directly connected to the control pressure chamber 17 or 18 of the directional control valve 12. The other work outlet is connected to the control pressure chamber 17 or 18 of the directional control valve 11 via a control line 80 which runs inside the housing 14. Finally, a tank outlet of each switch valve 22 is located on a tank channel Y.
  • a current is sent by deflecting the hand lever of the electrical pilot device 75 through the electromagnet 76 of a pressure reducing valve 77, the amount of which depends on the lever deflection and determines the pressure at the control outlet 78 of the valve.
  • the pressure at the control outlet 78 is also present in the control pressure chamber 17 or 18 of the directional control valve 11, acts on the valve piston of this directional control valve and displaces it until the pressure piston and one closes the valve piston center seeking resilience there is a balance.
  • the rest position of the changeover valves 22 that is Directional control valve 11 can be actuated.
  • the electrical pilot control device would have to be constructed in such a way that only two electrical actuation elements can be controlled proportionally, and additionally contain an electrical switch with which between the two electrical actuation elements for the one-way valve and the two electrical actuation elements can be switched for the other directional valve. Under certain circumstances, this makes it possible to manufacture the electrical pilot control device more cheaply than conventional electrical pilot control devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)

Abstract

L'invention concerne une commande pilote pour deux distributeurs (11, 12) à commande hydraulique, avec un dispositif de commande pilote hydraulique (51) ou électrique (75). Pour faire passer le premier distributeur (11) d'une position neutre dans des directions opposées, ce dispositif comprend une manette (56) pouvant pivoter d'une position neutre dans des directions opposées. Ledit dispositif ou les deux distributeurs déplaçables électriquement comportent en outre deux sorties de commande (78, 18) par l'intermédiaire desquelles, pour assurer un déplacement dans une direction, une pression pilote peut être appliquée à une première chambre de pression de commande (17), et pour assurer un déplacement dans l'autre direction, une pression pilote peut être appliquée à une seconde chambre de pression de commande (18) du premier distributeur (11). Pour obtenir une commande pilote peu complexe et économique, notamment dans le cas où il n'est pas souhaitable ou nécessaire que les deux distributeurs soient actionnés simultanément, il est prévu une soupape d'inversion (22) à commande électromagnétique qui relie une sortie de commande (78) du dispositif de commande pilote (51) ou d'un premier distributeur (77) déplaçable électriquement, dans sa première position de commutation, avec une chambre de pression de commande (17) du premier distributeur (11) et, dans sa seconde position de commutation, avec une chambre de pression de commande du second distributeur (12). Ce système permet de simplifier le dispositif de commande pilote ou de réduire le nombre de distributeurs à déplacement électrique.
EP97929187A 1996-06-22 1997-06-14 Commande pilote pour deux distributeurs a commande hydraulique Ceased EP0906515A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19624959 1996-06-22
DE19624959 1996-06-22
DE19630798 1996-07-31
DE19630798A DE19630798A1 (de) 1996-06-22 1996-07-31 Vorsteuerung für zwei hydraulisch betätigbare Wegeventile
PCT/EP1997/003112 WO1997049922A1 (fr) 1996-06-22 1997-06-14 Commande pilote pour deux distributeurs a commande hydraulique

Publications (1)

Publication Number Publication Date
EP0906515A1 true EP0906515A1 (fr) 1999-04-07

Family

ID=26026817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97929187A Ceased EP0906515A1 (fr) 1996-06-22 1997-06-14 Commande pilote pour deux distributeurs a commande hydraulique

Country Status (2)

Country Link
EP (1) EP0906515A1 (fr)
WO (1) WO1997049922A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3110210A1 (de) * 1981-03-17 1982-09-30 Hartmann & Lämmle GmbH & Co KG, 7255 Rutesheim Hydraulische schalteinrichtung zur steuerung der arbeits- und stillstandsphasen von arbeits- oder werkzeugmaschinen
US4469007A (en) * 1981-11-20 1984-09-04 Caterpillar Tractor Co. Single lever control with automatic valve latching
DE3812753C2 (de) * 1988-04-16 1994-05-26 Rexroth Mannesmann Gmbh Ventilanordnung für eine verstellbare Pumpe
CA2008694A1 (fr) * 1990-01-26 1991-07-26 Ronald F. Howarth Systeme de commande de soupape
JP2551538Y2 (ja) * 1990-02-27 1997-10-22 株式会社小松製作所 パイロット弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9749922A1 *

Also Published As

Publication number Publication date
WO1997049922A1 (fr) 1997-12-31

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