EP1106839B1 - Elément de contrôle hydraulique - Google Patents

Elément de contrôle hydraulique Download PDF

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Publication number
EP1106839B1
EP1106839B1 EP00125635A EP00125635A EP1106839B1 EP 1106839 B1 EP1106839 B1 EP 1106839B1 EP 00125635 A EP00125635 A EP 00125635A EP 00125635 A EP00125635 A EP 00125635A EP 1106839 B1 EP1106839 B1 EP 1106839B1
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EP
European Patent Office
Prior art keywords
chamber
slide
branch
connects
port
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.)
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EP00125635A
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German (de)
English (en)
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EP1106839A2 (fr
EP1106839A3 (fr
EP1106839A8 (fr
Inventor
Claudio Bovi
Renato Brevini
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Brevini Hydraulics SpA
Original Assignee
Brevini Hydraulics SpA
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Publication of EP1106839A2 publication Critical patent/EP1106839A2/fr
Publication of EP1106839A8 publication Critical patent/EP1106839A8/fr
Publication of EP1106839A3 publication Critical patent/EP1106839A3/fr
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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
    • 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
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation 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
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • 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
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and 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
    • F15B2211/3122—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
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/353—Flow control by regulating means in 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
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle 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
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6055—Load sensing circuits having valve means between output member and the load sensing circuit using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/65—Methods of control of the load sensing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups

Definitions

  • the present invention relates to a control device according to EP 0 786 598 A which discloses the preamble of claim 1 for the actuation of a hydraulic user device, with an input pressure compensator, having high operating stability. More particularly, the device according to the present invention is designed to be used in hydraulic systems for the actuation of user devices constituted by double-acting hydraulic cylinders or by hydraulic motors or user devices with two actuation branches which are selectively connected to a pressurized branch of the hydraulic circuit and to the discharge branch, for example in machines for lifting or moving a load.
  • Hydraulic circuits generally fed by a single pump having an adequate flow-rate, for the actuation of a plurality of user devices which usually have different loads or require mutually different pressures for their actuation, are known.
  • each user device is usually controlled by means of a bidirectional pilot valve which selectively connects the two hydraulic feed branches of the corresponding user device to the pressurized branch of the main circuit or to the discharge branch or closes said two feed branches of the user device being considered.
  • a pressure compensator is arranged on the branch of the circuit that connects the pressurized branch, i.e., the delivery of the pump, to the pilot valve of each user device.
  • Said pressure compensator is meant to maintain a constant difference in pressure between the pressurized branch of the hydraulic circuit, which is connected to the delivery of the pump, and the operating pressure that overcomes the load, by means of the ⁇ P that forms across the distribution rod or slide of the pilot valve.
  • the two branches that feed the user device, by way of the actuation of the pilot valve are connected respectively to the pressurized branch that enters the pilot valve and to the discharge branch of the circuit; the branch of the user device that is connected to the pressurized branch is connected, through said pilot valve, to a duct which enters the pressure compensator and through which the working pressure is transmitted to the pressure compensator.
  • the pressure transmitted through said duct from the branch of the user device to the pressure compensator constitutes a hydraulic signal known as "load sensing" or LS, which in this manner drives the pressure compensator.
  • the actuation of the user device being considered must be interrupted when the pressure along an actuation branch of said user device reaches a preset maximum value.
  • the duct LS is connected to a maximum-pressure valve which connects the duct LS and therefore the corresponding user device actuation branch to the discharge branch of the circuit, or more generically to a discharge, when said preset maximum pressure is reached.
  • the hydraulic user device constituted by a hydraulic cylinder or by a hydraulic motor
  • the hydraulic user device must be actuated with low pressures and with a reduced flow-rate.
  • instability problems can arise in the form of pulsating pressures which generate intense oscillations on the mechanical structures of said machines, such as to compromise their functionality.
  • the aim of the present invention is to solve the above-described problems by providing a hydraulic control device, for the actuation of a hydraulic user device, with an input pressure compensator, which achieves high operating stability during actuation.
  • an object of the invention is to provide a device which ensures operating stability even when the hydraulic user device must be actuated with low pressures and reduced flow-rates.
  • Another object of the invention is to provide a device which can be obtained, with modest modifications which are simple to implement, from conventional devices provided with a pressure compensator on the input of the bidirectional pilot valve that controls the actuation of the hydraulic user device.
  • a hydraulic control device for the actuation of a hydraulic user device, with input pressure compensator, comprising a bidirectional pilot valve, which can be actuated in order to connect one actuation branch of a user device to a pressurized branch of a hydraulic circuit and the other actuation branch of the user device to a discharge branch of the hydraulic circuit, and a pressure compensator, which is arranged on the pressurized branch of the hydraulic circuit that enters said pilot valve
  • said pilot valve comprising a valve body in which a substantially cylindrical seat is provided which slidingly accommodates a slide, said seat having, along its axial extension, larger-diameter regions which are alternated with smaller-diameter regions which are slidingly coupled to said slide; said larger-diameter regions forming in the valve body, around said slide, a plurality of chambers which comprise a first chamber in a substantially central position, which is connected to a first port which is connected to the pressurized branch of the
  • the device in its first embodiment, comprises a bidirectional pilot valve, generally designated by the reference numeral 1, which can be actuated in order to connect one actuation branch A or B of a hydraulic user device to a pressurized branch P of a hydraulic circuit and the other actuation branch B or A of the user device to a discharge branch T of the hydraulic circuit.
  • a bidirectional pilot valve generally designated by the reference numeral 1
  • the reference numeral 1 can be actuated in order to connect one actuation branch A or B of a hydraulic user device to a pressurized branch P of a hydraulic circuit and the other actuation branch B or A of the user device to a discharge branch T of the hydraulic circuit.
  • the device also comprises, in a per se known manner, a pressure compensator 2 which is arranged on the pressurized branch of the hydraulic circuit that enters the pilot valve 1.
  • a pressure compensator 2 which is arranged on the pressurized branch of the hydraulic circuit that enters the pilot valve 1.
  • P 1 The portion of the pressurized branch that runs from the pressure compensator 2 to the pilot valve 1 has been designated by P 1 .
  • the pilot valve 1 comprises a valve body 3 in which a substantially cylindrical seat 4 is present which accommodates, so that it can slide axially, a slide 5 which is arranged coaxially in the seat 4.
  • the seat 4 has, along its axial extension, larger-diameter regions which are alternated with smaller-diameter regions; said smaller-diameter regions are coupled slidingly and hermetically to regions of the side wall of the slide 5.
  • Said larger-diameter regions form, in the body 3 of the pilot valve 1, around the slide 5, a plurality of chambers which comprise a first chamber 6, in a substantially central position, which is connected to a first port 7 which is formed in the valve body 3 and is connected to the pressurized branch P 1 of the hydraulic circuit in output from the pressure compensator 2.
  • a second chamber 8 and a third chamber 9 are formed laterally, on opposite sides with respect to the first chamber 6, and are connected respectively to a second port 10, which is formed in the body 3 of the pilot valve 1 and is connected to the actuation branch A of the user device, and to a third port 11, which is formed in the body 3 of the pilot valve 1 and is connected to the actuation branch B of the other user device.
  • a fourth chamber 12 and a fifth chamber 13 are formed laterally to the second chamber 8 and to the third chamber 9, on the opposite side with respect to the first chamber 6, and are respectively connected to a fourth port 14 and to a fifth port 15, which are formed in the body 3 of the pilot valve 1 and are connected to the discharge branch T of the hydraulic circuit.
  • a sixth chamber 16 and a seventh chamber 17 are formed laterally to the fourth chamber 12 and to the fifth chamber 13, on the opposite side with respect to the first chamber 6, and are respectively connected to a sixth port 18 and to a seventh port 19 which are formed in the body 3 of the pilot valve 1 and are connected to the inlet 20a of a control duct 20, which is in turn connected to the pressure compensator 2 for its actuation in contrast with the pressure along the pressurized branch P 1 that enters the pilot valve 1.
  • An eighth chamber 21 and a ninth chamber 22 are formed laterally to the sixth chamber 16 and to the seventh chamber 17, on the opposite side with respect to the first chamber 6, and are respectively connected to an eighth port 23 and to a ninth port 24 which are formed in the body 3 of the pilot valve 1 and are respectively connected to a first adjustment duct 25 and to a second adjustment duct 26.
  • the slide 5 can move on command along its own axis, inside the seat 4, into three operating positions: a first position, in which it connects the first chamber 6 to the second chamber 8 and the third chamber 9 to the fifth chamber 13, so as to connect the actuation branch A of the user device to the pressurized branch of the hydraulic circuit and the actuation branch B of the user device to the discharge branch of the hydraulic circuit; a second position, in which it connects the first chamber 6 to the third chamber 9 and the second chamber 8 to the fourth chamber 12, so as to connect the actuation branch B of the user device to the pressurized branch of the hydraulic circuit and the actuation branch A of the user device to the discharge branch of the hydraulic circuit; and a third position or idle position, in which it interrupts the connection of the first chamber 6 to the second chamber 8 and to the third chamber 9.
  • the sixth chamber 16 is connected, by means of a connecting duct 32, to the seventh chamber 17 and the slide 5 has at least one first internal duct 30 which connects the first chamber 6 to the sixth chamber 16 or to the seventh chamber 17 when the slide 5 is in the first position or in the second position; the slide 5 further has a first passage 31 which connects the seventh chamber 17 to the fifth chamber 13 or the sixth chamber 16 to the fourth chamber 12 when the slide 5 is in the first position or in the second position.
  • the slide 5 connects the sixth chamber 16 to the eighth chamber 21; in the second position, said slide connects the seventh chamber 17 to the ninth chamber 22.
  • the chambers 6, 8, 9, 12, 13, 16, 17, 21 and 22 are arranged symmetrically with respect to an imaginary central plane 33 which is perpendicular to the axis of the seat 4.
  • the slide 5 has a substantially cylindrical active region, provided with mutually spaced circumferential narrowings 34, 35, 36 and 37, which is designed to interact with said chambers.
  • the circumferential narrowings 34, 35, 36 and 37 delimit, in the active region of the slide, a central portion 38, two mid-lateral portions 39 and 40, and two end-lateral portions 41 and 42.
  • Recesses 43, 44 straddle the circumferential narrowings 34 and 35, which are located respectively between the central portion 38 and the mid-lateral portion 39 and between the central portion 38 and the mid-lateral portion 40.
  • the recesses 43, 44 are shaped like a cusp which gradually widens toward the outer surface of the slide and also gradually widen from the mid-lateral portions 39, 40 and from the central portion 38 toward the circumferential narrowings 34 and 35, which they straddle.
  • said internal duct 30 in which the internal duct 30 lies in the region of the slide 5 that is occupied by the central portion 38, by the mid-lateral portion 40 and by the end-lateral portion 42, said internal duct 30 has an inlet 30a on the central portion 38 and an outlet 30b at the circumferential narrowing 37.
  • the first passage 31 is constituted by a choke which is formed in the mid-lateral portion 39 of the slide 5 and preferably has a cross-section which gradually tapers toward the central portion 38 of the slide 5.
  • a second internal duct 50 which connects the second chamber 8 to the sixth chamber 16 when the slider 5 is in the first position and connects the fourth chamber 12 to the eighth chamber 21 when the slide 5 is in the second position.
  • the position of the first internal duct 30 might be switched with the position of the second internal duct 50 symmetrically with respect to the imaginary median plane 33a of the slide 5.
  • Said median plane 33a coincides with the median plane 33 of the seat 4 when the slide 5 is in the third position.
  • the inlet 30a would again be formed in the central portion 38, but so as to be located in the second chamber 8 when the slide 5 is in the second position, and the outlet 30b would be located at the circumferential narrowing 36; in this case, furthermore, the second internal duct 50 would have an inlet 50a on the mid-lateral portion 40, so as to be located in the fifth chamber 13 when the slide 5 is moved into the first position, and an outlet 50b at the circumferential narrowing 37, so as to be located in the third chamber 9, connecting it to the seventh chamber 17, when the slide 5 is moved into the second position.
  • the pressure compensator 2 is pushed into the closure position by the pressure along P 1 in contrast with the action of a spring 60.
  • the control duct 20 is connected to the pressure compensator 2 so as to act thereon concordantly with the action of the spring 60 and therefore so as to open the pressure compensator.
  • the first adjustment duct 25, along which the pressurized hydraulic signal LS A , which corresponds to the actuation pressure of the branch A of the user device, is transmitted, is connected to the discharge branch T of the hydraulic circuit through a maximum-pressure valve 61 which connects the adjustment duct 25 to the discharge branch T when a pressure which is at least equal to the calibration pressure of the valve 61 occurs along the adjustment duct 25.
  • the second adjustment duct 26, along which the pressurized hydraulic signal LS B , which corresponds to the actuation pressure of the branch B of the user device, is transmitted, is also connected to the discharge branch T of the hydraulic circuit through a maximum-pressure valve 62 which connects the adjustment duct 26 to the discharge branch T when a pressure which is at least equal to the calibration pressure of the valve 62 occurs along the adjustment duct 26.
  • the adjustment ducts 25 and 26 each have a branch which is connected to the discharge branch T by means of respective controllable electric valves 63 and 64.
  • the electric valves 63 and 64 in normal operating conditions, are energized or closed and thus prevent the connection of the adjustment ducts 25 and 26 to the discharge branch T and can be deenergized in order to provide said connection when conditions occur which require an interruption of the actuation of the user device during actuation on the branch A or on the branch B.
  • the circuit shown in Figures 4 to 6 is completed by a choke 65 which is arranged on the control duct 20 and by a branch 20b of the control duct 20 which enters a switching or selection valve 66.
  • the outlet of the switching valve 66 is connected to a flow/pressure regulator 67, which is arranged along a branch 68 for connecting the pressurized branch P to the discharge branch T of the hydraulic circuit. More particularly, the flow/pressure regulator 67 is kept in the open position by the pressure that is present in the pressurized branch P in contrast with the action applied by a spring 69.
  • the signal LS that arrives from the control duct 20 acts on the flow/pressure regulator 67 concordantly with the action of the spring 69, which thus acts so as to cause the closure of the flow/pressure regulator 67, as will become better apparent hereinafter.
  • Figure 13 illustrates a hydraulic circuit which serves two user devices: respectively, a first user device, designated by the reference numeral 90, which is controlled by means of a device according to the invention, and a second user device, generally designated by the reference numeral 91, which is controlled by means of a device of the type disclosed in the previously cited patent No. 1,281,708.
  • the pump that feeds the hydraulic circuit is designated by the reference numeral 71.
  • one or both of the maximum-pressure valves 61 and 62 may be absent, and one or both of the electric valves 63 and 64 may also be absent.
  • the device in this first embodiment, is particularly suitable for use if one requires an actuation of the user device which is similar to the actuation that can be obtained with a proportional directional valve in the feed of the branch A of the user device, such as for example during the lifting of a load, and if it is necessary to actuate the branch B of the user device with a low pressure and a reduced flow-rate, such as for example during the lowering of a load.
  • the slide 5 When the slide 5 is moved from the third position or idle position ( Figures 3 and 6) to the first position ( Figures 1 and 4), the first chamber 6 is connected to the second chamber 8, the sixth chamber 16 is connected to the eighth chamber 21, and the third chamber 9 is connected to the fifth chamber 13.
  • the duct 50 connects the second chamber 8 to the sixth chamber 16, while the duct 30 connects the third chamber 9 to the ninth chamber 22.
  • the branch P 1 is connected to the branch A. It should be noted that when the slide 5 is in this position, the branch A and the branch P 1 are connected to the control duct 20, along which the signal LS is transmitted, and to the first adjustment duct 25, along which the hydraulic signal LS A is transmitted.
  • the branch B and the second adjustment duct 26, along which the hydraulic signal LS B is transmitted, are connected to the discharge branch T. In this operating condition, the pressure compensator 2 operates normally.
  • the first chamber 6 is connected to the third chamber 9, the seventh chamber 17 is connected to the ninth chamber 22, and the second chamber 8 is connected to the fourth chamber 12.
  • the duct 30 connects the first chamber 6 to the seventh chamber 17, the duct 50 connects the fourth chamber 12 to the eighth chamber 21, while the passage 31 connects the sixth chamber 16 to the fourth chamber 12.
  • the pressure of the branch P 1 is transmitted to the seventh chamber 17 and from there to the pressure compensator 2, so that said pressure acts concordantly with the spring 60 in order to maintain the pressure compensator 2 in the open position or in any case increase its aperture.
  • the seventh chamber 17 is connected to the sixth chamber 16 through the connecting duct 32, part of the flow that enters the first chamber 6 is sent to the discharge branch T by means of the passage 31.
  • the extent of the flow discharged through the passage 31 is a function of the position of the slide 5 as a consequence of the particular shape of said passage 31.
  • the compensator 2 Owing to the fact that the pressure transmitted along the control duct 20 to the pressure compensator 2 is equal to, or slightly lower than, the pressure along the branch P 1 , the compensator 2 is kept in a fully open position or in any case in a partly open position in which its aperture is greater than it would be if the actuation duct 20 were connected to the branch B of the user device.
  • the signal LS which is identical to or slightly lower than the pressure P 1 , is sent through the switching valves 66 and 70 to the flow/pressure regulator 67, assisting the spring 69 in causing or increasing the closure of said flow/pressure regulator 67.
  • the working pressure of the pump 71 is considerably higher than the pressure required to feed the branch B of the user device. Higher operating stability is thus achieved even if the user device, in order to be actuated, requires low pressures and reduced flow-rates.
  • the device again comprises a bidirectional pilot valve, generally designated by the reference numeral 1a, whose body is provided substantially like the body 3 of the pilot valve 11.
  • the body of the pilot valve 1a, the seat for the slide 5a, the various chambers formed along said seat, and the ports for connecting various ducts have been designated by the same reference numerals used to designate the similar elements described with reference to the first embodiment.
  • the slide 5a, as regards its side wall, is provided in the same manner as described with reference to the slide 5 of the first embodiment.
  • An internal duct again designated by the reference numeral 30, is formed in the slide 5a, as in the first embodiment.
  • the slide 5a has a second internal duct 80 which has an inlet 80a on the central portion 38 and an outlet 80b at the circumferential narrowing 36.
  • the position of the inlet 80a is such that it lies within the first chamber 6 in order to connect the first chamber 6 to the sixth chamber 16 when the slide 5a is moved into the first position and such that it lies in the second chamber 8 in order to connect it to the eighth chamber 21 when the slide 5a is moved into the second position.
  • the slide 5a has, on the mid-lateral portion 40, a second passage 81 which, when the slide 5a is in the first position, connects the seventh chamber 17 to the fifth chamber 13.
  • the slide 5a is preferably provided so as to be symmetrical with respect to the imaginary median plane 33a of the slide 5a.
  • the first chamber 6 is connected to the second chamber 8
  • the sixth chamber 16 is connected to the eighth chamber 21
  • the third chamber 9 is connected to the fifth chamber 13.
  • the duct 80 connects the first chamber 6 to the sixth chamber 16
  • the duct 30 connects the third chamber 9 to the ninth chamber 22, and the passage 81 connects the seventh chamber 17 to the fifth chamber 13.
  • the branch P 1 of the hydraulic circuit is connected to the branch A of the user device, while the branch B of the user device is connected to the discharge branch T.
  • the branch A of the user device is connected to the first adjustment duct 25, while the second branch B and the second adjustment duct 26 are connected to the discharge branch T.
  • the pressure in input to the pilot valve is transmitted, through the second internal duct 80, to the control duct 20 and assists the spring 60 in its action on the pressure compensator 2 in order to maintain or increase its aperture.
  • Part of the flow in input to the pilot valve 1 is conveyed into the discharge branch T through the second passage 81, which connects the seventh chamber 17 to the fifth chamber 13, owing to the connection provided between the sixth chamber 16 and the seventh chamber 17.
  • the extent of the flow conveyed to the discharge branch T depends on the position of the slide 5a owing to the particular configuration of the second passage 81.
  • the signal LS is also transmitted, through switching or selection valves, to a flow/pressure regulator, as already described with reference to the first embodiment, in order to keep said flow/pressure regulator in the closure position, thus forcing the pump that feeds the pressurized branch to work at pressures which are higher than those actually required to actuate the user device.
  • the pump By moving the slide 5a into the second position one obtains an operation which is similar to the one described with reference to the first embodiment, i.e., the pump operates with higher pressures for the supply of the branch B of the user device as well. Owing to this fact, both during the actuation of the branch A of the user device and during the actuation of the branch B of the user device the pump is forced to operate at pressures which are higher than those required to actuate the user device and accordingly higher operating stability is obtained.
  • the pressurized fluid drawn from the central chamber, through the internal duct 30 or 80, and is conveyed to the discharge, through the corresponding passage 31 or 81, allows to keep the chamber 16 and 17 at the same pressure and thus ensures perfect hydrostatic support of the slide 5 or 5a.
  • the device according to the invention fully achieves the intended aim and objects, since by way of the fact that it forces the pump to operate at a pressure which is higher than the pressure actually required by the actuation of the user device, it achieves higher operating stability even if the user device requires reduced pressures and flow-rates in order to be actuated.
  • a further advantage of the device according to the invention is that it allows to use a pilot valve which can be derived very simply from conventional pilot valves, for example of the type disclosed in patent No. 1,281,708, simply by replacing the slide.
  • the materials employed, as well as the dimensions, may be any according to requirements and to the state of the art.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (13)

  1. Dispositif de régulation hydraulique, pour l'actionnement d'un dispositif utilisateur hydraulique, avec un compensateur de pression d'entrée, comprenant une soupape pilote bidirectionnelle (1, 1a) qui peut être actionnée afin de relier une branche d'actionnement (A, B) d'un dispositif utilisateur à une branche pressurisée (P1) d'un circuit hydraulique et l'autre branche d'actionnement (B, A) du dispositif utilisateur à une branche d'évacuation (T) du circuit hydraulique, et un compensateur de pression (2), qui est agencé sur la branche pressurisée du circuit hydraulique qui entre dans ladite soupape pilote (1, 1a), ladite soupape pilote comprenant un corps (3) de soupape dans lequel un siège (4) sensiblement cylindrique est disposé qui loge, avec faculté de glissement, une coulisse (5, 5a), ledit siège (4) comportant, le long de son extension axiale, des régions de plus grand diamètre qui sont alternées avec des régions de plus petit diamètre qui sont couplées, avec faculté de glissement, à ladite coulisse (5, 5a) ; lesdites régions de plus grand diamètre formant dans le corps (3) de soupape, autour de ladite coulisse, une pluralité de chambres qui comprennent une première chambre (6) dans une position sensiblement centrale, qui est reliée à un premier orifice (7) qui est relié à la branche pressurisée (P1) du circuit hydraulique ; une deuxième chambre (8) et une troisième chambre (9) étant latéralement formées sur des côtés opposés par rapport à ladite première chambre (6) et étant reliées respectivement à un second orifice (10) qui est relié à une branche d'actionnement (A) du dispositif utilisateur et à un troisième orifice (11) qui est relié à une autre branche d'actionnement (B) du dispositif utilisateur ; une quatrième chambre (12) et une cinquième chambre (13) étant formées latéralement à ladite deuxième chambre (8) et ladite troisième chambre (9), sur le côté opposé par rapport à ladite première chambre (6), et étant reliées respectivement à un quatrième orifice (14) et à un cinquième orifice (15) qui sont reliés à la branche d'évacuation (T) du circuit hydraulique ; une sixième chambre (16) et une septième chambre (17) étant latéralement formées par rapport à ladite quatrième chambre (12) et à ladite cinquième chambre (13), sur le côté opposé à ladite première chambre (6), et étant reliées respectivement à un sixième orifice (18) et à un septième orifice (19) qui sont reliés à une conduite de régulation (20) qui est reliée audit compensateur de pression (2) pour son actionnement, au contraire de la pression le long de ladite branche pressurisée (P1) qui entre dans la soupape pilote (1, 1a) ; ladite coulisse (5, 5a) étant mobile sur ordre dans trois positions : une première position, dans laquelle elle relie ladite première chambre (6) à ladite deuxième chambre (8) et ladite troisième chambre (9) à ladite cinquième chambre (13) ; une deuxième position, dans laquelle elle relie ladite première chambre (6) à ladite troisième chambre (9) et ladite deuxième chambre (8) à ladite quatrième chambre (12) ; et une troisième position, ou position de repos, dans laquelle elle interrompt la liaison de ladite première chambre (6) à ladite deuxième chambre (8) et à ladite troisième chambre (9) ; caractérisé en ce que ladite sixième chambre (16) est reliée à ladite septième chambre (17), et en ce que ladite coulisse (5, 5a) comporte au moins une première conduite interne (30) qui relie ladite première chambre (6) à ladite septième chambre (17) lorsque la coulisse est dans ladite deuxième position, ladite coulisse (5, 5a) comportant, en outre, au moins un premier passage (31) qui relie ladite sixième chambre (16) à ladite quatrième chambre (12) lorsque la coulisse (5, 5a) se situe dans ladite deuxième position.
  2. Dispositif de régulation hydraulique, pour l'actionnement d'un dispositif utilisateur hydraulique, avec un compensateur de pression d'entrée, comprenant une soupape pilote bidirectionnelle (1, 1a) qui peut être actionnée afin de relier une branche d'actionnement (A, B) d'un dispositif utilisateur à une branche pressurisée (P1) d'un circuit hydraulique et l'autre branche d'actionnement (B, A) du dispositif utilisateur à une branche d'évacuation (T) du circuit hydraulique, et un compensateur de pression (2), qui est agencé sur la branche pressurisée du circuit hydraulique qui entre dans ladite soupape pilote (1, 1a), ladite soupape pilote comprenant un corps (3) de soupape dans lequel un siège (4) sensiblement cylindrique est disposé qui loge, avec faculté de glissement, une coulisse (5, 5a), ledit siège (4) comprenant, le long de son extension axiale, des régions de plus grand diamètre qui sont alternées avec des régions de plus petit diamètre qui sont couplées, avec faculté de glissement, à ladite coulisse (5, 5a) ; lesdites régions de plus grand diamètre formant dans le corps (3) de soupape, autour de ladite coulisse, une pluralité de chambres qui comprennent une première chambre (6) dans une position sensiblement centrale, qui est reliée à un premier orifice (7) qui est relié à la branche pressurisée (P1) du circuit hydraulique ; une deuxième chambre (8) et une troisième chambre (9) étant latéralement formées sur des côtés opposés par rapport à ladite première chambre (6) et étant respectivement reliées à un deuxième orifice (10) qui est relié à une branche d'actionnement (A) du dispositif utilisateur et à un troisième orifice (11) qui est relié à une autre branche d'actionnement (B) du dispositif utilisateur ; une quatrième chambre (12) et une cinquième chambre (13) étant latéralement formées par rapport à ladite deuxième chambre (8) et à ladite troisième chambre (9), sur le côté opposé par rapport à ladite première chambre (6), et étant respectivement reliées à un quatrième orifice (14) et à un cinquième orifice (15) qui sont reliés à la branche d'évacuation (T) du circuit hydraulique ; une sixième chambre (16) et une septième chambre (17) étant latéralement formées par rapport à ladite quatrième chambre (12) et à ladite cinquième chambre (13), sur le côté opposé par rapport à ladite première chambre (6), et étant reliées respectivement à un sixième orifice (18) et à un septième orifice (19) qui sont reliés à une conduite de régulation (20) qui est reliée audit compensateur de pression (2) pour son actionnement, au contraire de la pression le long de ladite branche pressurisée (P1) qui entre dans la soupape pilote (1, 1a) ; ladite coulisse (5, 5a) étant mobile sur ordre dans trois positions : une première position, dans laquelle elle relie ladite première chambre (6) à ladite deuxième chambre (8) et ladite troisième chambre (9) à ladite cinquième chambre (13) ; une deuxième position, dans laquelle elle relie ladite première chambre (6) à ladite troisième chambre (9) et ladite deuxième chambre (8) à ladite quatrième chambre (12); et une troisième position, ou position de repos, dans laquelle elle interrompt la liaison de ladite première chambre (6) à ladite deuxième chambre (8) et à ladite troisième chambre (9) ; caractérisé en ce que ladite sixième chambre (16) est reliée à ladite septième chambre (17), et en ce que ladite coulisse (5, 5a) comporte au moins une première conduite interne (30) qui relie ladite première chambre (6) à ladite sixième chambre (16) lorsque la coulisse (5, 5a) se situe dans ladite première position, ladite coulisse comportant, en outre, au moins un premier passage (31) qui relie ladite septième chambre (17) à ladite cinquième chambre (13) lorsque la coulisse se situe dans ladite première position.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'une huitième chambre (21) et une neuvième chambre (22) sont formées au niveau dudit siège (4), dans le corps (3) de la soupape, latéralement à ladite sixième chambre (16) et ladite septième chambre (17) sur le côté opposé par rapport à ladite première chambre (6), et sont respectivement reliées à un huitième orifice (23), qui est relié à une conduite d'ajustement (25), et à un neuvième orifice (29), qui est relié à une autre conduite d'ajustement (26); ladite coulisse (5, 5a), dans ladite première position, reliant ladite sixième chambre (16) à ladite huitième chambre (21) et, dans ladite deuxième position, reliant ladite septième chambre (17) à ladite neuvième chambre (22).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdites chambres (6, 8, 9, 12, 13, 16, 17, 21, 22) sont agencées symétriquement par rapport à un plan médian (33) qui est perpendiculaire à l'axe dudit siège (4) et en ce que ladite coulisse (5, 5a) comporte une région active qui est sensiblement cylindrique et comporte des rétrécissements circonférentiels (34, 35, 36, 37) mutuellement espacés et est conçue pour interagir avec lesdites chambres.
  5. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que lesdits rétrécissements circonférentiels (34, 35, 36, 37) délimitent, dans ladite région active de la coulisse (5, 5a), une partie centrale (38), deux parties latérales médianes (35, 40), et deux parties latérales d'extrémité (41, 42) de ladite coulisse (5, 5a) ; des évidements (43, 44) étant prévus qui s'étendent desdites parties latérales médianes (39, 40) vers ladite partie centrale (38) à califourchon sur les rétrécissements (34, 35) situés entre lesdites parties (38, 39, 40) ; lesdits évidements (43, 44) reliant ladite deuxième chambre (8) à ladite première chambre (6) et ladite troisième chambre (9) à ladite cinquième chambre (13) lorsque ladite coulisse (5, 5a) se situe dans la première position et reliant ladite première chambre (6) à ladite troisième chambre (9) et ladite deuxième chambre (8) à ladite quatrième chambre (12) lorsque ladite coulisse (5, 5a) se situe dans la deuxième position.
  6. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que lesdits évidements (43, 44) ont une forme de corne qui s'élargit progressivement vers la surface externe de ladite coulisse (5, 5a) et s'élargit également progressivement à partir desdites parties latérales médianes (39, 40) et à partir de ladite partie centrale (38) vers les rétrécissements circonférentiels (34, 35) qu'ils enjambent.
  7. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ladite conduite interne (30) comporte un orifice d'entrée (30a) sur ladite partie centrale (38) et un orifice de sortie (30b) sur le rétrécissement circonférentiel (36, 37) situé entre l'une desdites parties latérales médianes (39, 40) et la partie latérale d'extrémité (41, 42) contiguë.
  8. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit premier passage (31) est constitué par un étranglement formé dans une partie latérale médiane (39, 40) de ladite coulisse (5, 5a).
  9. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit étranglement a une section transversale qui s'effile progressivement vers ladite partie centrale (38) de ladite coulisse (5, 5a).
  10. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ladite coulisse (5) comporte une deuxième conduite interne (5a) qui relie ladite deuxième chambre (8) à ladite sixième chambre (16) ou ladite quatrième chambre (12) à ladite huitième chambre (21) lorsque la coulisse se situe dans ladite première position ou dans ladite seconde position.
  11. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ladite première conduite interne (30) de la coulisse (5) repose dans la partie de la coulisse située entre ladite partie centrale (38) et une extrémité axiale de la coulisse (5), ladite deuxième conduite interne (5a) étant agencée dans la partie de la coulisse (5) qui repose entre ladite partie centrale (38) et l'autre extrémité axiale de la coulisse (5).
  12. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ladite coulisse (5a) comporte :
    une première conduite interne (30), qui relie ladite troisième chambre (9) à ladite neuvième chambre (22) lorsque la coulisse (5a) se situe dans ladite première position et relie ladite première chambre (6) à ladite septième chambre (17) lorsque la coulisse (5a) se situe dans ladite deuxième position ;
    un premier passage (31), qui relie ladite sixième chambre (16) à ladite quatrième chambre (12) lorsque la coulisse (5a) se situe dans ladite deuxième position ;
    une deuxième conduite interne (80), qui relie ladite première chambre (6) à ladite sixième chambre (16) lorsque la coulisse (5a) se situe dans ladite première position et relie ladite deuxième chambre (8) à ladite huitième chambre (21) lorsque la coulisse (5a) se situe dans ladite deuxième position ;
    un deuxième passage (81), qui relie ladite septième chambre (17) à ladite cinquième chambre (13) lorsque la coulisse (5a) se situe dans ladite première position.
  13. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ladite conduite de régulation (20) est reliée à un régulateur d'écoulement/pression (67) qui relie la branche pressurisée (P) à la branche d'évacuation (T) du circuit hydraulique, afin de produire ou d'accroítre sa fermeture au contraire de l'action appliquée par la pression dans ladite branche pressurisée (P).
EP00125635A 1999-11-25 2000-11-23 Elément de contrôle hydraulique Expired - Lifetime EP1106839B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999MI002467A IT1313848B1 (it) 1999-11-25 1999-11-25 Dispositivo di comando idraulico, per l'azionamento di un'utenzaidraulica, con compensatore della pressione in ingresso, ad elevata
ITMI992467 1999-11-25

Publications (4)

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EP1106839A2 EP1106839A2 (fr) 2001-06-13
EP1106839A8 EP1106839A8 (fr) 2001-08-16
EP1106839A3 EP1106839A3 (fr) 2002-07-24
EP1106839B1 true EP1106839B1 (fr) 2004-07-28

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DE (1) DE60012461T2 (fr)
DK (1) DK1106839T3 (fr)
IT (1) IT1313848B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802672C2 (de) * 1988-01-29 1993-12-16 Danfoss As Hydraulisches Steuerventil mit Druckfühleinrichtung
IT1281708B1 (it) * 1996-01-24 1998-02-26 Brevini Hydraulics Spa Dispositivo per l'azionamento di un'utenza idraulica con una velocita' di azionamento indipendente dal carico resistente gravante su tale
US5765594A (en) * 1996-04-02 1998-06-16 Danfoss A/S Hydraulic control valve

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Publication number Publication date
IT1313848B1 (it) 2002-09-24
DK1106839T3 (da) 2004-09-06
EP1106839A2 (fr) 2001-06-13
EP1106839A3 (fr) 2002-07-24
ITMI992467A0 (it) 1999-11-25
DE60012461D1 (de) 2004-09-02
EP1106839A8 (fr) 2001-08-16
DE60012461T2 (de) 2005-08-04
ITMI992467A1 (it) 2001-05-25

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