EP0777829A1 - Dispositif de commande electro-hydraulique pour un consommateur a double action - Google Patents

Dispositif de commande electro-hydraulique pour un consommateur a double action

Info

Publication number
EP0777829A1
EP0777829A1 EP96902898A EP96902898A EP0777829A1 EP 0777829 A1 EP0777829 A1 EP 0777829A1 EP 96902898 A EP96902898 A EP 96902898A EP 96902898 A EP96902898 A EP 96902898A EP 0777829 A1 EP0777829 A1 EP 0777829A1
Authority
EP
European Patent Office
Prior art keywords
valve
connection
chamber
control device
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96902898A
Other languages
German (de)
English (en)
Other versions
EP0777829B1 (fr
Inventor
Hartmut Sandau
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority claimed from US08/796,921 external-priority patent/US5799485A/en
Publication of EP0777829A1 publication Critical patent/EP0777829A1/fr
Application granted granted Critical
Publication of EP0777829B1 publication Critical patent/EP0777829B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool 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
    • 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
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet 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
    • 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
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control valves

Definitions

  • Electro-hydraulic control device for a double-acting consumer
  • the invention relates to an electrohydraulic control device for a double-acting consumer according to the type specified in the preamble of claim 1.
  • Such an electro-hydraulic control device is already known from EP 0 110 126 AI, in which a longitudinally movable control slide for a 4/3 function of two magnets arranged opposite one another on the housing can be actuated to control a double-acting consumer.
  • each consumer connection is secured by a hydraulically controlled shut-off valve of the poppet type, the pilot control of these shut-off valves being carried out by those tappets which transmit the switching movement of the magnets to the control slide.
  • a fourth position can also be achieved for free movement.
  • the control device can also be used to control a single-acting consumer use.
  • an electro-hydraulic control device which works with a proportional magnet and is suitable for fine control of volume flows.
  • the pilot valve element arranged in a main valve element is actuated by the proportional magnet and works in the manner of a sequence control with the main valve element, so that short response times and thus good control behavior are achieved.
  • the valve elements for the main and pilot stages are designed as seat valves so that the leakage is kept low.
  • the control device is also constructed so that no separate control oil supply is necessary.
  • a disadvantage of this control device is that it can only perform a 2/2 function and is therefore not suitable in this form for controlling a double-acting consumer.
  • the electrohydraulic control device with the characterizing features of claim 1 has the advantage that it can control a double-acting consumer with low leakage in proportional operation.
  • the solenoid valves allow short response times due to the selected slide actuators, what leads to good control behavior of the control device.
  • the control device can reach a total of four working positions with only two magnets, so that in addition to the usual functions of lifting, holding and lowering, by energizing both magnets, a fourth position is possible as a clearance; the switching sequence is arbitrary.
  • the control device works without a separate control oil supply and can also be used for a single-acting consumer. Furthermore, the control device is compact and is therefore suitable for mobile applications.
  • the housing is designed according to claims 15 or 17, so that the necessary valve seats for the main valve members in the housing can be produced inexpensively. Formations according to claims 16, 18 and 19 are also expedient, the position of the check valves in the housing being a space-saving one Design leads, the short channels also have a positive influence on the control behavior. Further advantageous embodiments result from the remaining claims, the description and the drawing.
  • FIG. 1 shows a circuit diagram of the electrohydraulic control device for a double-acting consumer in a simplified representation
  • FIG. 2 shows a longitudinal section through a proportional solenoid valve in a simplified design, as shown in FIG. 1 as a circuit diagram
  • FIG. 3 shows a part of the control device according to FIG. 1 4 shows a longitudinal section through a single shut-off valve in a simple design and on an enlarged scale
  • FIG. 5 shows a section according to VV in FIG. 4
  • FIG. 6 shows a longitudinal section through the control device according to FIG. 1 in a simplified constructional embodiment
  • 7, FIG. 7 a cross-section according to VII-VII in FIG. 6, FIG.
  • FIG. 8 a cross-section according to VIII-VIII in FIG. 6,
  • FIG. 9 a section according to IX-IX in FIG. 7 and
  • FIG. 10 a longitudinal section through a second embodiment s proportional solenoid valve for use in the control device according to FIG. 1.
  • FIG. 1 shows a circuit diagram of an electrohydraulic control device 10 for controlling a double-acting consumer 11 in a simplified representation, as can be used for LS systems.
  • the control device 10 has a first solenoid valve 12 and an identical, second solenoid valve 13.
  • Both solenoid valves 12, 13 are designed as proportionally operating valves with a 4-way, 2-position function, each of which can be actuated by a proportional magnet 14 or 15.
  • Each solenoid valve 12, 13 can be adjusted by its magnet 14 or 15 against the force of a spring 16 from its initial position 17 into a working position 18, the volume flow via the solenoid valve 12 or 13 being continuously controllable in proportion to the electrical input variable.
  • each solenoid valve 12, 13 each have an inlet connection 19 designated P, both of which are connected to a variable displacement pump 21, which supplies them with pressure medium. Furthermore, each solenoid valve 12, 13 has a return port 22, which is relieved to a tank 23. Furthermore, each solenoid valve 12, 13 has a first motor connection 24 labeled A, and a second motor connection 25 labeled B. In the illustrated starting position 17, the inlet connection 19 is hydraulically blocked, the first motor connection 24 is connected to the return connection 22 and the second motor connection 25 secured by a seat valve function 26 of the solenoid valve 12, 13. When deflected into the working position 18, the inlet connection 19 is connected to the first motor connection 24, while the second motor connection 25 is relieved to the return connection 22, these connections being continuously controllable.
  • a first working channel 27 leads from the first motor connection 24 on the first solenoid valve 12 to a first consumer connection 28, a hydraulically controllable, first check valve 29 being connected in this working channel 27.
  • the check valve 29 is there formed as a controlled check valve, its inlet 31 being connected to the first motor connection 24, while its outlet 32 is connected to the first consumer connection 28, while a control connection 33 can be pressurized via a first control line 34.
  • a first drain channel 35 leads to a second consumer connection 36, bypassing the check valves.
  • a second working channel 37 leads from the first motor connection 24 to the second consumer connection 36 in the second solenoid valve 13, a second shut-off valve 38 being connected in this working channel 37, which is identical to the first shut-off valve 29.
  • a second drain channel 41 leads from the second motor connection 25 of the second solenoid valve 13, bypassing the check valves 29, 38 to the first consumer connection 28.
  • the control device 10 also has a shuttle valve 42, the slide 43 of which has a spring-centered central position.
  • the changeover valve 42 is connected with its end pressure connections 44, 45 to the first and second working channels 27 and 37, respectively upstream of the shut-off valves 29, 38, while its central connection 46 reports the respective maximum load pressure to the variable displacement pump 21 or if there is no pressure or Same pressure relieves this center connection 46 to a tank connection 47.
  • FIG. 2 shows a longitudinal section through a first solenoid valve 12, which is of a simplified design, as shown only schematically in FIG. 1.
  • the design of the control device according to DE 41 40 604 AI is expressly assumed to be known, from the essential components and their mode of action can be removed.
  • the solenoid valve 12 according to FIG. 2 the same components as in FIG. 1 are also provided with the same reference symbols.
  • the solenoid valve 12 has a continuous, multiply offset slide bore 51 in a housing 50, in which an inlet chamber 52, a first motor chamber 53, a return chamber 54, an intermediate chamber 55 and a second motor chamber 56 are formed next to one another by means of annular extensions. These chambers are connected in a corresponding manner to the assigned inlet connection 19, (P), the first motor connection 24 (A), the return connection 22 (R) and the second motor connection 25 (B).
  • a main control element 57 is guided in this slide bore 51, which accommodates a pilot control element 58 in its interior, which can be actuated by the armature 70 of the proportional magnet 14 against the force of the spring 16.
  • Main control element 57 and pilot control element 58 work together in the manner of a sequence control, with both control elements 57, 58 working with seat valve functions to securely seal the second motor chamber 56.
  • the main control member 57 has at its end facing away from the magnet 14 a main valve cone 59 which cooperates with a seat 60 fixed to the housing between the second motor chamber 56 and the intermediate chamber 55.
  • the main control member 57 delimits a pressure chamber 61 on the front side with its main valve cone 59, as a result of which a first circular pressure surface 62 is formed which loads the main control member 57 in the direction of its starting position 17. Furthermore, the
  • Main valve cone 59 is designed such that it forms a first differential surface 63, which is acted upon by the pressure in the second motor chamber 56 and which acts on the main control member 57 in the opening direction.
  • the connection from the second motor chamber 56 to the intermediate chamber 55 Return chamber 54 is controlled downstream of main valve plug 59 by a first piston section 64 with fine control chamfers 65.
  • a second piston section 66 is formed on the main control member 57 at a distance from this first piston section 64 in the region of the first motor chamber 53, and controls the connection from the inlet chamber 52 to the first motor chamber 53 with a second control edge 67 and associated fine control grooves 68.
  • the end of the main control element 57 facing the magnet 14 is designed such that it forms a second differential surface 69 which is acted upon by the pressure in the inlet connection 19 and which, when pressurized, together with the first pressure surface 63 loads the main control element 57 in the opening direction.
  • the second piston section 66 On the main control element 57, the second piston section 66 has a third control edge 71 which, in the illustrated starting position 17, connects the first motor chamber 53 to the return chamber 54.
  • the pilot element 58 To control the control oil flow from the pressure chamber 61 to the return chamber 54, the pilot element 58 has a slide edge 72 which takes over the fine control and a pilot cone 73 which takes over the reliable sealing, which are connected in series in the control oil flow.
  • the pilot element 58 is designed to be pressure-balanced and is loaded by the spring 16, which is fixed to the housing, in the direction of the starting position 17, with its pilot cone 73 being supported on the associated valve seat in the main control element 57.
  • the pressure chamber 61 can alternately be pressurized with pressure medium; the pressure in the inlet chamber 52 can reach the pressure chamber 61 via a longitudinal bore 74 and a check valve 75 fixed to the housing with inlet throttle 79.
  • pressure medium enters the pressure chamber 61 via a second check valve 76 with an inlet throttle 79 arranged in the main valve cone 59.
  • Pilot member 58 are arranged in the main control member 57 transverse bores 77 which lie in the area between the two piston sections 64 and 66.
  • the two proportional magnets 14, 15 are de-energized and the solenoid valves 12 and 13 assume their respective initial positions 17. This blocks their inlet connection 19, as shown in FIG. 2 by the second control edge 67 on the second piston section 66. Furthermore, in the starting position 17, the first motor connection 24 to the return connection 22 is relieved in the case of each solenoid valve 12, 13, the third control edge 71 on the second piston section 66 opening the connection from the first motor chamber 53 to the return chamber 54 in FIG. Furthermore, in this starting position 17, the second motor connection 25 is secured by the seat valve function 26 of the solenoid valves 12 and 13 in order to keep a leakage oil flow low.
  • the main valve cone 59 is pressed onto the associated valve seat 60 by the pressure prevailing in the pressure chamber 61, since the higher of the pressures prevailing in the second motor chamber 56 or in the inlet chamber 52 can reach the pressure chamber 61 via the check valves 76 or 75 and applied to the large printing area 62 there.
  • the closing force on the main control member 57 is in any case greater than the opening forces that can be exerted by the pressure in the second motor connection 25 on the first differential surface 63 and / or by the pressure in the inlet chamber 52 on the second differential surface 69.
  • the pressure chamber 61 is securely sealed by the pilot cone 73 on the pilot member 58.
  • the pilot control member 58 itself is supported by the spring 16 which is fixed to the housing pressed on an associated valve seat in the main control member 57.
  • the solenoid valves 12, 13 relieve their adjacent sections of the working channels 27 and 37, so that the inlet 31 at each check valve 29 and 38 is depressurized.
  • the control connections 33 of both check valves 29, 38 are also relieved of pressure via the crosswise running control lines 34, 39.
  • the closing elements of the blocking valves 29, 38 are each pressed into their blocking position by their spring, so that the outlet 32 is hydraulically blocked.
  • the first consumer port 28 is hydraulically shut off by the first shutoff valve 29 and the poppet valve function 26 in the second solenoid valve 13, while the second consumer port 36 is shut off by the second shutoff valve 38 and the poppet valve function 26 in the first solenoid valve 12.
  • the piston rod 78 is thus hydraulically blocked in the double-acting consumer 11.
  • the proportional solenoid 14 of the first solenoid valve 12 is energized, whereby a proportional volume flow control to the consumer 11 is possible.
  • the magnet 15 on the second solenoid valve 13 remains currentless.
  • the first shut-off valve 29 acts as a pure check valve since its control connection 33 via the first control line 34, a section of the second Working channel 37 and the second solenoid valve 13 to the tank is relieved.
  • the second solenoid valve 13 shuts off the second drain channel 41 with its seat valve function 26. Pressure medium from the annular space of the consumer 11 flows via the second consumer connection 36, the first drain channel 35 to the second motor connection 25 at the first solenoid valve 12, from which it is discharged to the tank 23.
  • the pressure prevailing between the first solenoid valve 12 and the first shut-off valve 29 in the first working channel 27 builds up via the second control line 39 also in the control connection 33 on the second shut-off valve 38, whereby this works as a shut-off check valve and shuts off its outlet 32 with respect to the inlet 31.
  • the pressure prevailing in the first working channel 27 passes through the pressure connection 44 into the shuttle valve 42, the other pressure connection 45 of which is relieved to the tank.
  • the slide 43 of the shuttle valve 42 moves into its right end position, the pressure being fed from the first pressure connection 44 via the central connection 46 into the load pressure line to the variable displacement pump 21, while the tank connection 47 is blocked.
  • the control device 10 can thus operate in a manner known per se as an LS system.
  • the main control element 57 requires an additional drive, which is designed here in the manner of a sequence control.
  • the pilot control element 58 arranged in the main control element 57 is designed to be pressure-balanced for this purpose and is deflected in FIG. 2 by the armature 59 of the proportional magnet 14 only against the force of the spring 16 into its working position 18, ie to the left in FIG. 2.
  • the pilot cone 73 opens the Connection from the pressure chamber 61 via the pilot member 58 and the transverse bores 77 to the return chamber 54.
  • the slide edge 72 on the pilot member 58 provides fine control of this control oil flow in order to control the pressure in the pressure chamber 61 continuously. If this control oil connection is opened via the slide edge 72 and the pilot cone 73, the pressure in the pressure chamber 61 and thus also the closing force on the main control member 57 decrease.
  • the load pressure acting on the first differential surface 63 in the second motor chamber 56 and that on the second differential surface 69 acting inlet pressure in the inlet chamber 52 move the main control element 57 to the left in FIG. 2, the main control element 57 following the pilot control element 58 in a manner known per se in the manner of the sequence control.
  • the main valve cone 59 lifts off the valve seat 60 fixed to the housing and connects the second motor chamber 56 to the intermediate chamber 55, which in turn is relieved to the return chamber 54 via the fine control phases 65.
  • the size of the volume flow from the second motor connection 25 to the return connection 22 is regulated continuously and thus in proportion to the current value at the magnet 14.
  • its third control edge 71 on the second piston section 66 closes off the connection from the first motor chamber 53 to the return chamber 54, while at the same time the second control edge 67 opens the connection from the inlet chamber 52 to the first motor chamber 53.
  • the size of the volume flow is controlled by the fine control grooves 68.
  • the two small check valves 75 and 76 which are each in series with two assigned inlet throttles 79, select the higher pressure for driving the main control element 57.
  • This is either the pump pressure in the inlet chamber 52 or the load pressure in the second Motor chamber 56, especially when there is a pulling load.
  • This higher pressure always acts on the large pressure surface 62 and causes the closing force on it.
  • a volume flow to and from the double-acting consumer 11 is thus controlled with the first solenoid valve 14 in the "lifting" position.
  • the working position 18 extends over a range of the stroke of the main control member 57 so that the volume flow can be controlled proportional to the current value on the magnet 14.
  • the first check valve 29 works as a blocked check valve, while the shuttle valve 42 assumes its other end position and connects the pressure connection 45 to the center connection 46 and thus to the variable displacement pump 21.
  • the second solenoid valve 13 works in the same way as the structurally identical first solenoid valve 12 in the manner of the sequence control described.
  • a single-acting function can also be realized if, for example, instead of the double-acting consumer 11, a single-acting consumer is only connected to the first consumer connection 28, while the second consumer connection 36 is not used. Then the neutral position can be reached as before when both magnets 14, 15 are not energized.
  • a lifting position can be carried out by only energizing the first solenoid valve 12.
  • the lowering position can be carried out by energizing both solenoid valves 12, 13, the valve 13 being deflected only in accordance with the desired sink current.
  • the present control device 10 can also be used to implement a single-acting function, with a total of four working positions being possible when using two magnets.
  • the Control device 10 works without a separate control pressure supply and, due to its seat valve functions, with little leakage. In the case of clearance or lowering with a single-acting function, no unlocking pressure and therefore no pump pressure increase is required.
  • the solenoid valves 12, 13 can achieve short response times, so that the control device 10 has good control behavior.
  • FIG. 3 shows a schematic representation of part of the control device 10 with the shut-off valves 29, 38, which differ in a simplified control line circuit 81.
  • the control line circuit 81 has a main control line 82 which connects the two control connections 33 of both check valves 29, 38 to one another.
  • a small check valve 84 and a throttle 85 are provided in parallel in the valve bodies 83 of both check valves 29, 38. The small check valve 84 in the valve body 83 is used so that when a solenoid valve 12 or 13 is switched, the check valve 29 or 38 itself can function as a simple check valve and must open relatively quickly.
  • the blocking pressures can now be passed through the valve cone 83 on its rear side, so that a crossing of the lines is not necessary. If only one solenoid valve, for example 12, is actuated, the pressure pl in the inlet 31 is greater than the pressure p3 in the control connection 33 and the check valve 29 itself works as a check valve, the valve body 83 lifting off the seat. If both solenoid valves 12 and 13 are actuated at the same time, the pressures pl and p3 are the same, so that an associated spring 86 keeps the valve body 83 closed.
  • the Control line circuit 81 is considerably simplified in that it manages with a single main control line 82. This function of the check valves 29 and 38 is retained if a throttle 85 is arranged in only one of the two valve bodies 83.
  • FIG. 4 shows a longitudinal section through a constructed check valve 90 with which the functions of the check valve 29 shown schematically in FIG. 3 can be carried out.
  • the valve body shown schematically in Figure 1 and Figure 3 are designed so that their ratio of seat diameter to stem diameter is 1.
  • Such an embodiment requires hardened valve seats, which is disadvantageous when the control valve 10 is embodied in a cast housing.
  • the designed check valve 90 according to FIG. 4 is designed as a differential area valve, which does not require an exact seat diameter, but rather works with a relatively wide seat geometry and therefore with a small one Surface pressure in the cast housing is sufficient.
  • the check valve 90 has a sleeve-shaped valve body 91 which controls the connection from the inlet 31 to the outlet 32 and which is tightly and slidably guided on a bolt-shaped extension 92 of a lock piston 93.
  • the valve body 91 is supported by a spring 94 on the locking piston 93, on the extension 92 of which a collar 95 is formed.
  • the locking piston 93 is tightly and slidably guided in a housing bore 96 and delimits a space 97 which accommodates the spring 94 and which has a connection to the outlet 32 via a throttle groove 98.
  • In the blocking piston 93 a passage 99 leading from the inlet 31 to the control connection 33 is formed, into which a throttle check valve known per se is connected.
  • the function of the check valve 84 according to FIG triangular disk 101 taken, in the center of the throttle 85 is designed as a small bore. The shape of this triangular disk 101 can be clearly seen in the cross section according to FIG.
  • the function of the check valve 29 according to FIG. 3 can be implemented constructively with this check valve 90 according to FIG. 4, only a single main control line 82 going out at the control connection 33. If in this shutoff valve 90 the control port 33 is relieved and p3 equals zero, the valve body 91 will open when the volume flow arrives at the inlet 31 and control the volume flow into the outlet 32 at a higher pressure of pl, the pressure p2 of which is less than pl. If, on the other hand, the control connection 33 is acted upon and its pressure p3 is the same as the pressure in the inlet 31 with pl, the check valve 90 blocks the connection to the outlet 32. The lock piston 93 is displaced by the pressure in the control connection 33 against the force of the spring 94 and rests with its collar 95 on the sleeve-shaped valve body 91, whereby the latter is pressed onto the associated valve seat fixed to the housing.
  • FIG. 6 now shows in the form of a longitudinal section the structural design of the control device 10 according to FIG. 1, the same components as in FIGS. 1 to 5 also being provided with the same reference numerals.
  • an individual pressure compensator 105 is provided in the housing 50, which is connected upstream of the two solenoid valves 12 and 13.
  • FIGS. 7 to 9 represent cross sections or a section along lines VII-VII, VIII-VIII in FIG. 6 or IX-IX in FIG. 7.
  • the housing 50 has essentially a cuboid shape, since the device is designed for a disk construction in an LS system.
  • the two solenoid valves 12 and 13 are arranged with their longitudinal axes parallel to one another in such a way that both proportional magnets 14, 15 are attached to an end face 106. Due to the common arrangement of both magnets on one side, the control device 10 is also particularly advantageous for mechanical actuation.
  • a flat installation surface 107 is formed on the housing 50 opposite to the end face 106, towards which the two continuous, multiply offset slide bores 51 of both solenoid valves 12, 13 open.
  • the installation surface 107 is covered by a cover 108, in which the first consumer connection 28 is formed, while the second consumer connection 36 lies in the housing 50 itself. Both consumer connections 28, 36 are open to a surface 109.
  • the first solenoid valve 12 is arranged in the slide bore 51 which is closer to the upper side 109 in the housing 50, while the second solenoid valve 13 is located in the slide bore 51 below.
  • the inlet chambers 52 of both solenoid valves 12, 13 are connected to one another and also lead into the pressure compensator 105, which can be supplied with pressure medium by the variable displacement pump 21 via the pump connection 111.
  • the solenoid valves 12 and 13 lie in different longitudinal planes which run parallel to the flange surfaces 112 of the housing 50. Due to the spaced-apart longitudinal planes through the solenoid valves 12, 13, these can be in Seen vertically closer to each other, which allows a compact design and short channels. As further shown in FIG. 7 in conjunction with FIG. 9, the two shut-off valves 29, 38 and the shuttle valve 42 are located in a region of the housing 50 that extends between the two solenoid valves 12 and 13. It can be seen from FIG. 7 that the distance between the longitudinal planes running through the check valves 29 and 38 is still considerably larger than the distance between the longitudinal planes through the solenoid valves 12, 13.
  • the check valves 29 and 38 are offset in height relative to one another, to enable a particularly compact design. It is clear from FIG. 7 that the second consumer connection 36 is connected to the second motor chamber 56 of the first solenoid valve 12 and additionally to the outlet 32 of the second shut-off valve 38. Furthermore, in the same sectional plane, the second motor chamber 56 of the second directional valve 13 has an upward connection with the outlet 32 of the first shut-off valve 29 and is at the same time connected to the first consumer connection 28 via a lower bulge 113 and via a transverse channel 114 and a perpendicular working channel 115 in connection.
  • the first motor chamber 53 of the first solenoid valve 12 has a kidney-shaped bulge which projects obliquely downward, so that it is connected to the inlet 31 of the first shut-off valve 29, as can be seen in more detail from FIG.
  • the first motor chamber 53 of the second solenoid valve 13 has a kidney-shaped bulge which projects obliquely upwards, so that it has a connection to the inlet 31 of the second shut-off valve 38, as shown in more detail in FIG.
  • the return chambers 54 of both solenoid valves 12 and 13 are in through continuous return channels 116 and a connection or end plate, not shown Connection. In a manner corresponding to the return channels 116, the pump channel 111 penetrates the housing 50.
  • the function of the disk-shaped check valve 101 can also be dispensed with entirely in the case of the blocking valves 29 and 38 and only the throttle point 85 can be provided.
  • the check valves 29 and 38 can continue to perform their function, but the pressure in the intermediate main control line 82 is then only half the load pressure.
  • the mode of operation of the control device 10 according to FIG. 6 is basically the same as that according to FIG. 1, with express reference being made to the functioning of the solenoid valve 12 according to FIG. 2 and the check valve 90 according to FIG. The following is therefore only briefly the flow pattern in the housing 50, as it arises in the lifting and lowering positions. If only the solenoid valve 12 is actuated in the lifting position, it reaches the pump channel 111 via the pressure compensator 105 Inflow chamber 52 flowing volume flow via the second control edge 67 into the first motor chamber 53. As can be seen from Figure 8, there the volume flow flows down into the kidney-shaped recess and from there to the inlet 31 of the second shut-off valve 29, as can be seen in Figure 9 .
  • This shut-off valve 29 opens the connection to its outlet 32, from where the volume flow - as can be seen in FIG. 7 - flows further down via the second motor chamber 56 on the second solenoid valve 13 into the pocket-shaped bulge 113, from where it flows via the transverse channel 114 and the working channel 115 in the cover 108 reaches the first consumer connection 28.
  • the volume flow flowing back from the consumer is directed into the second consumer connection 36, from where it can reach the return chamber 54 via the second motor chamber 56 of the first solenoid valve 12 and its open main valve cone 59 via the intermediate chamber 55 and the fine control phases 65.
  • this volume flow flowing back also reaches the inlet 32 of the second shut-off valve 38, which, however, works as a blocked check valve as a result of the pressurization via the main control line 82 and blocks the connection to its inlet 31.
  • the volume flow coming via the pressure compensator 105 flows from the common inlet chamber 52 into the first motor chamber 53 of the second directional valve 13.
  • FIG. 8 shows in more detail, the volume flow comes from there via the oblique upward bulge of the first motor chamber 53 into the inlet 31 of the second shut-off valve 38. This works as a check valve and opens the connection to its outlet 32, from where the volume flow - as shown in FIG. 7 - past the second motor chamber 56 of the first Solenoid valve 12 for the second Consumer connection 36 flows and continues to consumer 11.
  • the volume flow flowing away from consumer 11 passes via first consumer connection 28, working channels 115 and 114 into pocket-shaped bulge 113 and further into second motor chamber 56 of second solenoid valve 13, via whose open main valve cone the pressure medium flow can also flow to the return chamber 54 via the intermediate chamber 55.
  • the other functions of the shuttle valve 42 and the volume flows in the open position can be seen in FIG. 1.
  • FIG. 10 shows a longitudinal section through another structural embodiment of a solenoid valve 120, as can be used in the control device 10 for the schematically illustrated solenoid valves 12 and 13.
  • the basic structure of the solenoid valve 120 is comparable to the solenoid valve 12 according to FIG. 2 in that it has a main control element 121 and a pilot control element 122 arranged therein, which work together in the manner of a sequence control, the pilot control element 122 being actuated by the armature 59 of the proportional magnet 14 becomes.
  • the solenoid valve 120 has a continuous, multiply stepped slide bore 123 in the housing 50, in which an inlet chamber 124, a first motor chamber 125, a second motor chamber 126, an intermediate chamber 127 and a return chamber 128 are formed by annular extensions.
  • the inlet chamber 124 is connected to the inlet connection 19 (P), the first motor chamber 125 to the first motor connection 24 (A), the second motor chamber 126 in a corresponding manner to the second motor connection 25 (B) and the return chamber 128 to the return connection 22 (R).
  • a housing-fixed valve seat 129 is formed, which cooperates with a main valve cone 131, which on the Magnet 14 remote end of the main control member 121 is arranged.
  • the main control member 121 has a first piston section 132 with fine control notches 133 which establish the connection between the intermediate chamber
  • the second motor chamber 126 is also sealed by an O-ring 134 in the main control member 121.
  • a second control edge 136 with adjoining fine control grooves 137 is arranged on a second piston section 135 in the region of the first engine chamber 125, which control the connection from the inlet chamber 124 to the first engine chamber 125.
  • a third control edge 138 on the second piston section 135 serves to relieve the first motor chamber 125, this relieving via a recess 139 in the return chamber
  • the pilot control element 122 which projects into a blind bore 141 of the main control element 121, controls with a slide edge 142 a connection from the inlet chamber 124 to an end-side pressure space 143, in which the end of the main control element 121 facing the magnet 14 projects.
  • the blind hole 141 is connected via a main throttle bore 144 to the recess 139 into which a damping piston 145 is fitted.
  • a ring insert 147 is installed in a widened section of the slide bore 123, on which a spring 148 is supported, which on the other hand presses the pilot member 122 against the armature 59 of the magnet 14.
  • the principle of operation of the solenoid valve 120 is in principle similar to that of the solenoid valve 12 according to FIG. 2.
  • the switching connections indicated on the solenoid valve 12 in FIG. 1 are achieved.
  • the second motor connection 25 being sealed off by the main valve cone 131 and thereby achieving the seat valve function 26.
  • the O-ring 134 which can also be designed as a slide ring or piston ring, provides for the sealing of the second motor connection 25 to the first motor chamber 125. A long, narrow gap at this point would also be possible as a seal.
  • the solenoid valve 120 is deflected into a working position 18, the pilot control element 122 and the main control element 121 working together in the manner of a sequence control.
  • the pilot member 122 is pressure balanced so that the armature 59 only has to overcome the force of the spring 147. Via the slide edge 142, the pilot control member 122 can increase the pressure in the pressure chamber 143, so that the opening force predominates on the main control member 121 and this is pressed to the left against the force of the main spring 146 into its working position.
  • the main valve cone 131 lifts off its assigned seat 129 and the volume flow flowing out of the second motor chamber 126 via the intermediate chamber 127 to the return 22 is regulated in size with the opening fine control notches 133. Of course, this control of the volume flow is proportional to the magnitude of the current signal on the proportional magnet 14.
  • connection from the first motor chamber 125 is controlled by the third control edge 138 via the recess 139 to the return 22, while the second control edge 136 simultaneously connects to the Inlet 19 opens.
  • the size of the volume flow flowing from the inlet chamber 124 to the first motor chamber 125 can be regulated via the fine control grooves 137.
  • the pressure in the pressure chamber 143 is reduced by a control oil flow which flows continuously via the throttle bore 144 to the return 22.
  • the damping piston 145 ensures smooth and damped movements of the main control member 121.
  • the solenoid valve 120 according to FIG. 10 can be arranged in a housing 50 together with the other functional elements in a manner similar to the solenoid valve 12 according to FIG. 2 in such a way that the same effect and advantages as in the control device according to FIG. 6 are achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Magnetically Actuated Valves (AREA)
  • Servomotors (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

L'invention concerne un dispositif de commande électro-hydraulique (10) destiné à un consommateur à double action (11). Grâce à deux vannes magnétiques 4/2 à fonctionnement proportionnel (12,13) ayant respectivement une fonction de soupape à siège (26) et au moyen de deux soupapes anti-retour (29,38) de type soupape à siège, ce dispositif permet une commande continue du débit vers et depuis le consommateur (11), une position de passage libre pouvant être obtenue comme quatrième position de travail. Les soupapes magnétiques (12,13) sont de construction identique et sont respectivement montées dans le flux s'écoulant vers le récepteur et dans le flux qui s'écoule du récepteur. Chaque raccordement du consommateur (28,36) est rendu étanche par la fonction de soupape à siège (26) des soupapes magnétiques (12,13) et par une soupape anti-retour (29,38). Les soupapes magnétiques (12,13) ont un organe principal de commande (57) et un organe de précommande (58) qui coopèrent à la manière d'une commande séquentielle et ne nécessitent pas d'alimentation séparée en huile de commande de façon à permettre la commande en continu d'importants efforts hydrauliques, avec de courts temps de réponse.
EP96902898A 1995-06-22 1996-02-24 Dispositif de commande electro-hydraulique pour un consommateur a double action Expired - Lifetime EP0777829B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19522746A DE19522746A1 (de) 1995-06-22 1995-06-22 Elektrohydraulische Steuereinrichtung für einen doppeltwirkenden Verbraucher
DE19522746 1995-06-22
PCT/DE1996/000314 WO1997001041A1 (fr) 1995-06-22 1996-02-24 Dispositif de commande electro-hydraulique pour un consommateur a double action
US08/796,921 US5799485A (en) 1995-06-22 1997-02-06 Electrohydraulic control device for double-acting consumer

Publications (2)

Publication Number Publication Date
EP0777829A1 true EP0777829A1 (fr) 1997-06-11
EP0777829B1 EP0777829B1 (fr) 2001-12-05

Family

ID=26016203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96902898A Expired - Lifetime EP0777829B1 (fr) 1995-06-22 1996-02-24 Dispositif de commande electro-hydraulique pour un consommateur a double action

Country Status (6)

Country Link
US (1) USRE38355E1 (fr)
EP (1) EP0777829B1 (fr)
JP (1) JPH10505402A (fr)
BR (1) BR9606481A (fr)
DE (1) DE19522746A1 (fr)
WO (1) WO1997001041A1 (fr)

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DE19707722A1 (de) * 1996-11-11 1998-05-14 Rexroth Mannesmann Gmbh Ventilanordnung und Verfahren zur Ansteuerung einer derartigen Ventilanordnung
US6196247B1 (en) 1996-11-11 2001-03-06 Mannesmann Rexroth Ag Valve assembly and method for actuation of such a valve assembly
DE19649833A1 (de) 1996-12-02 1998-06-04 Bosch Gmbh Robert Elektrohydraulische Steuervorrichtung
DE19650465B4 (de) * 1996-12-05 2005-12-01 Robert Bosch Gmbh Elektrohydraulische Steuereinrichtung
DE29713294U1 (de) 1997-07-25 1997-09-25 Heilmeier & Weinlein Hydraulische Steuervorrichtung für ein Kipperfahrzeug
DE19843122C2 (de) * 1998-09-21 2002-10-17 Bosch Gmbh Robert Wegeventil
DE19932139B4 (de) * 1999-07-09 2009-06-18 Bosch Rexroth Aktiengesellschaft Vorgesteuertes Schieberventil
DE10023583B4 (de) * 2000-05-13 2012-05-24 Robert Bosch Gmbh Elektrohydraulischer Senken-Modul
DE10033757B4 (de) * 2000-07-12 2011-06-22 Linde Material Handling GmbH, 63743 Steuereinrichtung für einen hydraulischen Verbraucher
DE10034931B4 (de) * 2000-07-18 2011-03-10 Linde Material Handling Gmbh Steuerventileinrichtung
DE10056288B4 (de) * 2000-11-14 2009-10-08 Linde Material Handling Gmbh Steuerventileinrichtung
EP1741936A1 (fr) * 2005-07-08 2007-01-10 THOMAS MAGNETE GmbH Vanne de régulation de débit pour liquides
KR101148377B1 (ko) * 2009-11-02 2012-05-21 (주) 삼진정밀 체크밸브 무손실 유압제어시스템
DE102012006681A1 (de) * 2012-03-30 2013-10-02 Hydac Fluidtechnik Gmbh Ventil, insbesondere vorgesteuertes Proportional-Druckregelventil
CN105666432B (zh) * 2016-03-29 2018-06-22 浙江大学 一种五自由度的皮纳卫星安装装置
DE102018102397A1 (de) * 2018-02-02 2019-08-08 J.D. Neuhaus Holding Gmbh & Co. Kg Steuerventilanordnung zur indirekten pneumatischen Steuerung
EP3660365B1 (fr) * 2018-11-27 2021-07-21 Hamilton Sundstrand Corporation Servovanne

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Also Published As

Publication number Publication date
USRE38355E1 (en) 2003-12-23
WO1997001041A1 (fr) 1997-01-09
DE19522746A1 (de) 1997-01-02
EP0777829B1 (fr) 2001-12-05
JPH10505402A (ja) 1998-05-26
BR9606481A (pt) 1997-09-30

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